CN103139129A - Compressing/ decompressing method of multi-carrier modulation signals and compressor/ decompressor - Google Patents
Compressing/ decompressing method of multi-carrier modulation signals and compressor/ decompressor Download PDFInfo
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- CN103139129A CN103139129A CN2011104000079A CN201110400007A CN103139129A CN 103139129 A CN103139129 A CN 103139129A CN 2011104000079 A CN2011104000079 A CN 2011104000079A CN 201110400007 A CN201110400007 A CN 201110400007A CN 103139129 A CN103139129 A CN 103139129A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2626—Arrangements specific to the transmitter only
- H04L27/2627—Modulators
- H04L27/2634—Inverse fast Fourier transform [IFFT] or inverse discrete Fourier transform [IDFT] modulators in combination with other circuits for modulation
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M7/00—Conversion of a code where information is represented by a given sequence or number of digits to a code where the same, similar or subset of information is represented by a different sequence or number of digits
- H03M7/30—Compression; Expansion; Suppression of unnecessary data, e.g. redundancy reduction
- H03M7/3059—Digital compression and data reduction techniques where the original information is represented by a subset or similar information, e.g. lossy compression
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M7/00—Conversion of a code where information is represented by a given sequence or number of digits to a code where the same, similar or subset of information is represented by a different sequence or number of digits
- H03M7/30—Compression; Expansion; Suppression of unnecessary data, e.g. redundancy reduction
- H03M7/3068—Precoding preceding compression, e.g. Burrows-Wheeler transformation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2626—Arrangements specific to the transmitter only
- H04L27/2627—Modulators
- H04L27/2634—Inverse fast Fourier transform [IFFT] or inverse discrete Fourier transform [IDFT] modulators in combination with other circuits for modulation
- H04L27/26362—Subcarrier weighting equivalent to time domain filtering, e.g. weighting per subcarrier multiplication
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Abstract
The invention provides a novel compressing/ decompressing method of multi-carrier modulation signals and a compressor/ a decompressor. According to the compressing/ decompressing method of the multi-carrier modulation signals and the compressor/ the decompressor, the multi-carrier modulation signals are alternated in a time-frequency domain mode and are converted into a frequency domain, the multi-carrier modulation signals are compressed in the frequency domain in a low loss mode, and needed bandwidth for transferring compressed signals is greatly reduced. The signals transferred through wired network is decompressed in a frequency domain mode firstly, and then a conventional baseband signal process is carried out. According to the compressing/ decompressing method of the multi-carrier modulation signals and the compressor/ the decompressor, high compression ratio can be obtained, bandwidth requirements of a pull far optical network in an access network are reduced, wherein the pull far optical network is processed based on an integrity type.
Description
Technical field
The present invention relates to mobile communication technology, relate in particular to compression/decompression method and the compressor/decompressor of the multicarrier modulated signal in mobile communications network.
Background technology
Along with the rapid growth of mobile Internet business, mobile operator is for retaining its competitive edge, and the cost of disposing traditional Access Network is more and more higher.In order to reduce the networking cost, offer high-quality service for the user simultaneously, many mobile operator and equipment supplier begin to consider to adopt more attractive scheme, popular scheme all is based on spaced antenna and centralized Base-Band Processing framework, such as the cloud Access Network (C-RAN) of China Mobile and the clever cloud wireless (LightRadio) of Alcatel Lucent etc. at present.Employing is based on the Access Network framework of centralized Base-Band Processing, and the demand of site, base station can be cut down greatly, and baseband processing equipment (perhaps baseband processing unit BBU) also can be shared between a plurality of virtual base stations.Compare with traditional Access Network, this framework can be saved operation cost and construction cost greatly.And the advanced persons' such as inter-cell interference cancellation, multipoint cooperative scheduling and signal processing technology are easier to realize, thereby this framework can provide larger capacity, wider covering and better user's experience.
In these centralized processings system, baseband processing unit (BBU) separates geographically with far end radio frequency head (RRH), can connect by cable networks such as fiber optic network or Ethernets, and carry out data interaction by open base station architecture agreement (OBSAI) or common wireless interface (CPRI), the original time domain baseband signal of transmission on these wired connections.This framework has brought huge challenge to the wire transmission bandwidth demand of fiber optic network or Ethernet, for example, 8 antenna 3Gpp LTE (Long Term Evolution project) systems of bandwidth 20MHz need the wire transmission bandwidth of 9.8304Gbps, and just the bandwidth demand of LTE-A (LTE-Advance) increases sharply especially to 49.152Gbps in Standardization Research.
For the above-mentioned problem of crossing high bandwidth requirements, had at present a small amount of compression algorithm can be used for compressing baseband signal, two kinds of typical schemes have: the compression algorithm (Fig. 2) of the time-domain signal compression algorithm (Fig. 1) that adopts in the clever cloud of Alcatel Lucent wireless (LightRadio) and Samplify company.These algorithms can provide the compression ratio of 2～3 times, and bring very little performance loss, can effectively reduce the bandwidth demand of wire transmission.Compare with nothing compression transmission, adopt these effective compression algorithms, only need the fiber resource less than half.
But, for the multicarrier modulated signal in wireless communication system, the OFDM (OFDM) that for example adopts in the LTE/LTE-A system or DFT spread spectrum OFDM (DFT-S-OFDM) modulation, compressing at frequency domain can be more effective.Compression algorithm by for the uplink multi-carrier modulation signal characteristic Design that receives can obtain higher compression ratio, and these features have:
1. the uplink multi-carrier modulation signal that receives is large in the time domain dynamic range, and little in the Domain Dynamic scope, therefore can have more advantage in the frequency domain compression.
2. receive signal and have noise induced damage, under Low SNR, cross high-precision quantification and can not bring any gain, can adopt low-bit width to quantize.
3. because broadband signal has experienced frequency-selective channel, perhaps because the distance of transmitter and receiver has far to be had closely, all can cause the acute variation of received signal strength on different subcarriers.More rational scheme should be that the signal on different sub carrier is quantized with adaptive bit wide.
In addition, when the base station provided service for a plurality of users simultaneously, on adjacent sub-carrier, signal power had very large difference, and this is to be caused by user's Signal to Interference plus Noise Ratio working point or channel fading separately.The frequency domain compression can independently quantize the signal on different sub carrier, and they are independent of each other.And adopting the time domain data compression technology, the mutual aliasing of subscriber signal meeting on different sub carrier, high power subscriber signal have larger impact to quantizing, thereby have damaged the low-power subscriber signal.Therefore, the frequency domain compression also has more advantage than time domain data compression in this case.
Summary of the invention
For solving above-mentioned shortcoming of the prior art, the present invention has effectively utilized the feature of multicarrier modulated signal, as the independence between subcarrier, frequency-selective channel etc., provides compression/decompression method and the compressor/decompressor of multicarrier modulated signal.According to the present invention, first multicarrier modulated signal is carried out time-frequency domain conversation, multicarrier modulated signal transforms to frequency domain, then hangs down at frequency domain and damages compression, and the required bandwidth of signal transmission after compression reduces greatly.Corresponding, the signal after the cable network transmission, must advanced line frequency the territory decompress(ion), and then carry out conventional base band signal process.
Particularly, according to an embodiment of the invention, provide a kind of compression method of multicarrier modulated signal, comprise, the time domain multicarrier modulated signal is processed by time-frequency domain conversation, transform to frequency domain; The frequency domain multicarrier modulated signal is compressed processing; Multicarrier modulated signal after compression is encapsulated and sends.
According to a specific embodiment of the present invention, described the frequency domain multicarrier modulated signal is compressed to process comprise deletion gap carrier wave.
According to a specific embodiment of the present invention, described the frequency domain multicarrier modulated signal is compressed to process comprise the frequency domain multicarrier modulated signal carried out low-order bit and/or high order bit blocks.
According to a specific embodiment of the present invention, described the frequency domain multicarrier modulated signal is compressed to process comprise, common factor is extracted in grouping to the frequency domain multicarrier modulated signal.
According to a specific embodiment of the present invention, describedly the frequency domain multicarrier modulated signal is carried out low-order bit block and comprise, multicarrier modulated signal is carried out noise level estimate; Estimating according to noise level, is under acceptable terms guaranteeing that low level blocks the performance loss that brings, and determines the suitable bit number that blocks, and the described low-order bit that blocks bit number is blocked.
According to a specific embodiment of the present invention, describedly the frequency domain multicarrier modulated signal is carried out high order bit block and comprise, the dynamic range of signals statistics is carried out in grouping to multicarrier modulated signal; Determine that according to the maximum of every group of signal level or the mean value of every group of signal level high order bit blocks bit number and the described high order bit that blocks bit number is blocked.
According to a specific embodiment of the present invention, to the RACH targeting signal, described the time domain multicarrier modulated signal to be processed by time-frequency domain conversation, the process that transforms to frequency domain comprises, frequency band is moved, and the RACH targeting signal is moved frequency band central authorities; Filtering extraction filters described time domain multicarrier modulated signal and extracts sampling point, and time-frequency domain conversation is processed, and determines suitable FFT window, carries out the FFT computing, obtains the RACH sequence of frequency domain.
According to a specific embodiment of the present invention, described gap carrier wave comprises the signal on boundary belt, direct current subcarrier or never call Resource Block.
According to another implementation of the invention, provide a kind of decompressing method of multicarrier modulated signal, comprise, resolve the compressed package receive, obtain the signal after compression; Signal after compression is carried out the frequency domain decompress(ion).
According to a specific embodiment of the present invention, described frequency domain decompress(ion) comprises that the truncated signal after the compression on each subcarrier is carried out sign bit to be expanded.
According to a specific embodiment of the present invention, described frequency domain decompress(ion) comprises the signal times common factor after the compression on every group of subcarrier is amplified.
According to another implementation of the invention, provide a kind of frequency domain compressor reducer, comprising: the time-frequency domain conversation processing unit, be used for the time domain multicarrier modulated signal is processed by FFT, transform to frequency domain;
Compression processing unit is used for the frequency domain multicarrier modulated signal is compressed processing; Signal assemble and transmitting element, the multicarrier modulated signal after being used for compressing encapsulates and sends.
According to a specific embodiment of the present invention, described compression processing unit comprises gap carrier wave deletion processing unit, is used for deleting the gap carrier wave of described frequency domain multicarrier modulated signal.
According to a specific embodiment of the present invention, described compression processing unit comprises, bit blocks the unit, is used for the frequency domain multicarrier modulated signal is carried out low-order bit and/or high-order than blocking.
According to a specific embodiment of the present invention, described compression processing unit comprises, extracts the common factor unit, is used for to the frequency domain multicarrier modulated signal grouping and extracts common factor.
According to a specific embodiment of the present invention, described bit blocks the unit and comprises, the level estimation unit is used for that multicarrier modulated signal is carried out noise level and estimates; Low level blocks the bit number determining unit, is used for the estimating noise level according to the output of level estimation unit, is under acceptable terms guaranteeing that low level blocks the performance loss that brings, and determines that suitable low level blocks bit number; Low-order bit blocks the unit, is used for blocking bit number according to the low level of determining, the low-order bit that described low level is blocked bit number blocks.
According to a specific embodiment of the present invention, described bit blocks the unit and comprises, the dynamic range of signals statistic unit is used for multicarrier modulated signal is divided into groups to carry out the dynamic range of signals statistics; A high position is blocked the bit number determining unit, is used for the mean value according to maximum or every group of signal level of every group of signal level, determines that a suitable high position blocks bit number; High order bit blocks the unit, is used for blocking bit number according to a high position of determining, the high order bit that a described high position is blocked bit number blocks.
According to a specific embodiment of the present invention, described time-frequency domain conversation processing unit further comprises, and frequency band is moved the unit, is used for that the RACH targeting signal is moved frequency band central; The filtering extraction unit is used for filtering described time domain multicarrier modulated signal and extracting sampling point.
According to a specific embodiment of the present invention, described gap carrier wave comprises the signal on boundary belt, direct current subcarrier or never call Resource Block.
According to a specific embodiment of the present invention, described compressor reducer is configured on far end radio frequency head RRH equipment.
According to another implementation of the invention, provide a kind of Frequency Domain Solution depressor, comprise, resolution unit be used for to be resolved the compressed package that receives, and obtains the signal after compression; Frequency domain decompress(ion) unit is used for the signal after the compression of resolution unit output is carried out the frequency domain decompress(ion).
According to a specific embodiment of the present invention, described frequency domain decompress(ion) unit comprises that grouping takes advantage of the common factor amplifying unit, is used for the signal times common factor after the compression on every group of subcarrier is amplified.
According to a specific embodiment of the present invention, described frequency domain decompress(ion) unit comprises the sign bit expanding element, is used for the truncated signal after the compression on each subcarrier is carried out the sign bit expansion.
According to a specific embodiment of the present invention, described Frequency Domain Solution depressor is configured on baseband processing equipment.
According to another implementation of the invention, provide a kind for the treatment of system of uplink multi-carrier modulation signal, comprise, far end radio frequency head RRH equipment, described far end radio frequency head RRH equipment comprises a frequency domain compressor reducer; Baseband processing equipment, described baseband processing equipment comprise a Frequency Domain Solution depressor; Fiber optic network or Ethernet are in order to transmit the signal between far end radio frequency head RRH equipment and baseband processing equipment.
Description of drawings
By below in conjunction with the description of the drawings, and along with understanding more comprehensively of the present invention, other purposes of the present invention and effect will become more clear and easy to understand, wherein:
Fig. 1 represents the time-domain signal compression method schematic diagram of the clever cloud of prior art in wireless.
Fig. 2 represents the compression method schematic diagram of the Samplify company of prior art.
Fig. 3 represents the treatment system schematic diagram of uplink multi-carrier modulation signal according to the embodiment of the present invention.
Fig. 4 a, 4b, 4c, 4d, 4e, 4f represent respectively the frequency domain compression process schematic diagram of different compression schemes according to the embodiment of the present invention.
Fig. 5 represents RACH sequential extraction procedures schematic diagram according to the embodiment of the present invention.
Fig. 6 represents to extract the schematic diagram of common factor.
Fig. 7 represents the adaptive quantizing principle schematic that bit according to the embodiment of the present invention blocks.
Fig. 8 a, 8b represent that respectively low-order bit according to the embodiment of the present invention blocks the schematic diagram that blocks with high order bit.
Fig. 9 a, 9b represent the encapsulation format schematic diagram of compressed signal according to the embodiment of the present invention.
Figure 10 a, 10b represent the Frequency Domain Solution baric flow journey schematic diagram of different decompress(ion) schemes according to the embodiment of the present invention.
Figure 11 a, 11b, 11c, 11d, 11e, 11f represent respectively the frequency domain compressor configuration schematic diagram of different compression schemes according to the embodiment of the present invention.
Figure 12 a, 12b, 12c represent the Frequency Domain Solution depressor structural representation of different decompress(ion) schemes according to the embodiment of the present invention.
In all above-mentioned accompanying drawings, identical label represents to have identical, similar or corresponding feature or function.
Embodiment
Specifically describe embodiments of the present invention below in conjunction with accompanying drawing.
Fig. 3 provides the treatment system schematic diagram of uplink multi-carrier modulation signal, carry out time-frequency domain conversation and carry out Signal Compression by compression processing unit 312 at frequency domain at the first uplink multi-carrier modulation signal that is received by 311 pairs of the time-frequency domain conversation processing units of frequency domain compressor reducer 310 of RRH, signal after compression is transferred to BBU through cable network, and carries out the laggard row base band signal process of frequency domain decompress(ion) at the Frequency Domain Solution depressor 320 of BBU.
Fig. 4 a, 4b, 4c, 4d, 4e, 4f have provided the frequency domain compression process schematic diagram of different compression schemes.Wherein, Fig. 4 a has provided an overall procedure schematic diagram, at first the present invention moves on to far end radio frequency head (RRH) with the time-frequency domain conversation unit from baseband processing unit (BBU) and realizes, namely at step S401, the time-domain signal that receives is carried out the conversion of time-frequency domain signal, time-domain signal is transformed to frequency domain.For most upward signals, as PUSCH (Physical Uplink Shared Channel), PUCCH (Physical Uplink Control Channel) and SRS (the SoundingReference Symbol in the LTE/LTE-A system, the echo reference symbol), can determine suitable FFT (fast fourier transform) window by timing information, then carry out corresponding FFT computing according to system parameters, time-domain signal is transformed to frequency domain.
For RACH (Random Access Channel) targeting signal of LTE/LTE-A, according to one embodiment of present invention, the conversion of time-frequency domain signal can be realized by the RACH front-end processing, comprise the following steps:
(a) frequency band is moved: the RACH targeting signal is moved frequency band central, this is the passband of back decimation filter.The offset information of the shared frequency band of RACH targeting signal can be notified by BBU.
(b) filtering extraction: filter the reception signal and extract sampling point, sampling rate is dropped to 2.56MHz.Table 1 has provided the sampling coefficient under the different system bandwidth condition.
Table 1
| System bandwidth | Sampling rate | The sampling coefficient |
| 5MHz | 7.68MHz | 3 |
| 10MHz | 15.36MHz | 6 |
| 20MHz | 30.72MHz | 12 |
(c) 2048 FFT: determine suitable FFT window, carry out 2048 FFT computings, obtain length after conversion and be 839 RACH sequence.For the RACH targeting signal, can be 839 RACH sequence by the length that extracts shown in Figure 5.
Then, at step S402, to the frequency-region signal after time-frequency domain conversation, carry out the frequency domain compression, the present invention provides the frequency domain compression and can adopt deletion gap carrier method, grouping to extract common factor method or a high position and/or low-order bit method for cutting, perhaps deletes gap carrier method and grouping and extracts the combination of common factor method or the combination of deletion gap carrier method and a high position and/or low-order bit method for cutting.
Adopt deletion gap carrier method to carry out the frequency domain compression in the embodiment that Fig. 4 b provides, concrete, adopt the signal on deletion boundary belt, direct current subcarrier and never call Resource Block.Some subcarrier does not carry any information:
(a) boundary belt and direct current subcarrier;
(b) subcarrier of never call: Radio Resource is dispatched according to business demand in the base station, and these subcarriers are not used.
They do not have help to the processing of BBU end, there is no need that these signals are delivered to the BBU end and process.
Due to BBU and RRH position of known (a) class subcarrier all, the processing of this class subcarrier is not needed extra information interaction.
For (b) class subcarrier, it calls situation can notify RRH according to resource scheduling information with simple bitmap by BBU.For example, the LTE system of bandwidth 20MHz has been divided into 100 Resource Block with available subcarrier, so can indicate with the bitmap of 100 bits the situation of calling of these Resource Block.RRH is according to the bitmap indication of receiving, then the signal on deletion never call subcarrier further compresses all the other useful signals.Deletion never call sub-carrier signal can improve the compression ratio under low loading condition.
Adopt grouping to extract the common factor method in the embodiment that Fig. 4 c provides and carry out the frequency domain compression, concrete, because the signal on each subcarrier in each Resource Block has adopted identical modulation system, they have a common factor, all signals are divided by this common factor, business's real part and imaginary part are all very little integers, can represent with a small amount of bit during quantification; Without performance loss, common factor can represent with full precision (as 16 bits) for assurance.Extract the common factor schematic diagram as shown in Figure 6, to the subcarrier of 16QAM Resource Block, the common factor of each subcarrier is 1623, all sub-carrier signals are all divided by 1623, like this, real part and the imaginary part of the subcarrier after the extraction common factor are all very little integers, can represent with a small amount of bit.
The method that adopts a high position and/or low-order bit to block in the embodiment that Fig. 4 d provides is carried out the frequency domain compression, wherein, according to system requirements, can only adopt high order bit to block or low-order bit blocks or high order bit blocks to block with low-order bit and all adopts to carry out frequency domain compression.Concrete, Fig. 7 provides the adaptive quantizing principle schematic that bit blocks, and estimates and the received signal strength estimation according to noise level, blocks adaptively low level and the high position of digital signal, can represent with a small amount of bit the signal that receives only can bring very little performance loss.Can come according to the signal on boundary belt the estimating noise level.
(a) for all digital signals, its low level is damaged by additive noise.The truncation part low-order bit is made an uproar as long as the quantizing noise that brings is no more than the end, just can not cause the deterioration of signal.
(b) due to the greatest differences of received signal power on different sub carrier, on each Resource Block, the dynamic range of signal is also different, but on the interior adjacent sub-carrier of Resource Block, signal has close dynamic range.The present invention adds up maximum or the mean value of signal level on interior 12 subcarriers of each Resource Block, blocks accordingly its high order bit.Like this, each Resource Block carries out respectively the estimation of signal level and carries out respectively high order bit and block.Carry out this operation and can cause performance loss hardly.
As shown in Fig. 8 (a), block low-order bit according to the noise level of estimating.Should choose the suitable bit number (NL) that blocks, be acceptable to guarantee that low level blocks the performance loss that is brought, and table 2 has provided according to different noise levels determines that low level blocks the embodiment of bit number.
Table 2
As shown in Fig. 8 (b), block high order bit according to the maximum of received signal level.The present invention adds up in each Resource Block the dynamic range of signal on 12 subcarriers, i.e. the maximum of all complex signal real parts and imaginary part, thus determine the position of effective sign bit, block all the other high order bits, because they are simple repetitions of significant character position.Here a just high-order embodiment who blocks who lists, this step also can adopt other means to realize, for example blocks high order bit according to the average level that receives signal.
Fig. 4 e provides the schematic flow sheet that is incorporated into line frequency territory compression of deletion gap carrier method and grouping extraction common factor method.In this scheme, first frequency-region signal is carried out the deletion of gap carrier wave, then common factor is extracted in grouping.According in communication standards to the definition of Resource Block, frequency-region signal is divided into groups, then calculate and extract common factor.The method of the deletion of gap carrier wave and extraction common factor as previously mentioned.
Fig. 4 f provides the schematic flow sheet that deletion gap carrier method and a high position and/or low-order bit method for cutting are incorporated into line frequency territory compression.Deletion gap carrier method and a high position and/or low-order bit method for cutting have a detailed description front, do not repeat them here, but what must one carry is, in these two kinds of method combinations, must carry out first that noise level is estimated and/or received signal strength is estimated, then delete gap carrier wave and a high position and/or low-order bit and block and carry out the frequency domain compression.
By above-mentioned frequency domain compression, wire transmission can be greatly reduced as the baseband signal that zooms out the online transmission of light, and brings controlled performance loss.Like this, wire transmission just greatly reduces as the bandwidth demand that zooms out the light net, and this makes based on the Access Network deployment of centralized processing more convenient, and cost is cheaper.
After the frequency domain compression, at step S403, the signal after the encapsulation compression, and the compressed package after encapsulating is issued BBU.
For the compressed signal after deletion gap carrier wave, get final product with general i/q signal encapsulation.
For adopting grouping to extract the scheme that common factor carries out the frequency domain compression, for the correct primary signal of recovering when the decompress(ion), after extracting common factor, need to be with common factor and the signal after extracting common factor encapsulate into compressed package together.Encapsulation format is as shown in Fig. 9 a.Wherein common factor can adopt full precision (as 16 bits) to quantize, extracting the real part of signal after common factor and imaginary part chooses the appropriate bit number according to modulation system and quantizes respectively, 2 bit quantizations are adopted in modulation as QPSK, and 16QAM adopts 3 bit quantizations, and 64QAM adopts 4 bit quantizations.
Carry out for adopting high order bit to block the scheme that frequency domain compresses, due in the high order bit truncated process, in the different resource piece on subcarrier the high position of signal to block bit number unequal, cause final quantizing bit number also different, therefore need to be at compressed package indicating quantizing bit number, encapsulation format is as shown in Fig. 9 b.Wherein quantizing bit number is 15 to the maximum, can represent with 4 digital bits.
Extract the scheme that is incorporated into line frequency territory compression of common factor method for adopting deletion gap carrier method and grouping, (Fig. 9 is a) similar to signal assemble after common factor is extracted in grouping for method for packing and form, and for adopting deletion gap carrier method and a high position and/or low-order bit method for cutting to be incorporated into the scheme of line frequency territory compression, method for packing and form and bit after the stage signal assemble (Fig. 9 b) similar.
From the angle of BBU, the processing of upward signal is not needed Timing Synchronization information accurately.Because RRH has the accurate reference timing signal that is derived from GPS, it may be controlled to frame regularly, and the upstream data after correct time is compression sends to BBU.So the upstream data of BBU is processed can be arranged to data driven mode, receive that starting immediately upstream data after compressed data packets processes, and carries out the operations such as frequency domain decompress(ion), signal demodulation, decoding.Figure 10 has provided the schematic flow sheet that the BBU side is carried out the frequency domain decompress(ion), and wherein, the schematic flow sheet of the frequency domain decompress(ion) that common factor amplifies, the schematic flow sheet of the frequency domain decompress(ion) of the corresponding sign bit expansion of Figure 10 b are multiply by in the corresponding grouping of Figure 10 a.
At step S1001, carry out the signal decapsulation, resolve the compressed package receive, obtain the signal after compression.
Figure 10 a is depicted as employing is included the decompression scheme that grouping extraction common factor carries out the frequency domain compression, at step S1002, to the signal of each grouping, multiply by respectively common factor to recover primary signal.
Figure 10 b is depicted as and employing is included bit blocks the decompression scheme that carries out frequency domain compression, at step S1012, to the truncated signal on each subcarrier in each Resource Block, expands its sign bit.Bit number after expansion is determined by the specific implementation of BBU, such as is extended to 16 bit numbers.
Correspondence is united the decompression scheme that adopts deletion gap carrier wave and grouping extraction common factor to carry out the frequency domain compression, can realize decompressing with reference to the decompression scheme shown in Figure 10 a.
Correspondence is united employing deletion gap carrier wave and bit blocks the decompression scheme that carries out the frequency domain compression, can realize decompressing with reference to the decompression scheme shown in Figure 10 b.
After the frequency domain decompress(ion) is completed, the upward signals such as PUSCH, PUCCH, SRS, RACH are carried out respectively conventional upstream data process, as the signal demodulation, decoding etc.
Figure 11 a, 11b, 11c, 11d, 11e, 11f have provided respectively the frequency domain compressor configuration schematic diagram of expression different compression schemes according to the embodiment of the present invention.And each frequency domain compressor configuration shown in Figure 11 is corresponding with each frequency domain compression process shown in Figure 4.The below specifically describes.
Figure 11 a has provided an overall frequency domain compressor configuration schematic diagram, 310 of corresponding diagram 3.Frequency domain compressor reducer 1100 comprises time-frequency domain conversation processing unit 1101, compression processing unit 1102, signal assemble and transmitting element 1103.
Concrete, time-frequency domain conversation processing unit 1101 is configured to for the time-domain signal that receives is carried out the conversion of time-frequency domain signal, time-domain signal be transformed to frequency domain.To general uplink multi-carrier signal such as PUSCH, PUCCH, SRS etc. determine suitable FFT (fast fourier transform) window by timing information, then carry out corresponding FFT computing according to system parameters, and time-domain signal is transformed to frequency domain.Further, time-frequency domain conversation processing unit 1101 comprises that also frequency band moves the unit, and the filtering extraction unit, is used for the processing to the RACH channel.Wherein, frequency band is moved the unit, is configured to for the RACH targeting signal being moved frequency band central; The filtering extraction unit is configured to be used to filtering described time domain multicarrier modulated signal and extracting sampling point.Then the RACH signal after filtering extraction is carried out FFT and transform to frequency domain.Time-frequency domain conversation processing unit 1101 specific implementation 26S Proteasome Structure and Functions do not repeat them here corresponding to step S401.
Compression processing unit 1120 is configured to for the frequency domain multicarrier modulated signal is compressed processing, corresponding to step S402.Corresponding, different embodiment according to the subject invention, Figure 11 b, Figure 11 c, Figure 11 d, Figure 11 e, Figure 11 f provide respectively and comprise that common factor unit 1105 is extracted in gap carrier wave deletion processing unit 1104, grouping or bit blocks unit 1106, and perhaps gap carrier wave deletion processing unit 1104 and grouping are extracted the combination of common factor unit 1105 or gap carrier wave deletion processing unit 1104 and bit and blocked the combination of unit 1106 to realize the frequency domain compressor configuration schematic diagram of frequency domain compression function.Next will be described.
Signal assemble and transmitting element 1103, the compressed package after being configured to encapsulate and will encapsulate for the multicarrier modulated signal after compressing is issued BBU.The function that this unit is realized is corresponding with the step that step S403 describes.Corresponding different frequency domain compression schemes, the encapsulation function of signal assemble and transmitting element 1103 configurations also is not quite similar, and at step S403 and Fig. 9 a, the existing record in detail of 9b does not repeat them here.
The below describes respectively Figure 11 b, Figure 11 c, Figure 11 d, Figure 11 e, the embodiment that Figure 11 f provides.
The embodiment that Figure 11 b provides is corresponding with the embodiment of Fig. 4 b.According to Figure 11 b, frequency domain compressor reducer 1110 comprises time-frequency domain conversation processing unit 1101, compression processing unit 1121 and signal assemble and transmitting element 1103.Similar to the embodiment that Figure 11 a provides, time-frequency domain conversation processing unit 1101 is configured to for the time-domain signal that receives is carried out the conversion of time-frequency domain signal, time-domain signal be transformed to frequency domain.Signal assemble and transmitting element 1103, the compressed package after being configured to encapsulate and will encapsulate for the multicarrier modulated signal after compressing is issued BBU.Compression processing unit 1121 is configured to for the frequency domain multicarrier modulated signal is compressed processing; comprise a gap carrier wave deletion processing unit 1104, gap carrier wave deletion processing unit 1104 is configured to adopt the signal on deletion boundary belt, direct current subcarrier and never call Resource Block to realize the frequency domain compression function.The existing specific descriptions in front processed in the deletion of gap carrier wave, do not repeat them here.
The embodiment that Figure 11 c provides is corresponding with the embodiment of Fig. 4 c.According to Figure 11 c, frequency domain compressor reducer 1120 comprises time-frequency domain conversation processing unit 1101, compression processing unit 1122 and signal assemble and transmitting element 1103.Similar to the embodiment that Figure 11 a provides, time-frequency domain conversation processing unit 1101 is configured to for the time-domain signal that receives is carried out the conversion of time-frequency domain signal, time-domain signal be transformed to frequency domain.Signal assemble and transmitting element 1103, the compressed package after being configured to encapsulate and will encapsulate for the multicarrier modulated signal after compressing is issued BBU.Compression processing unit 1122 is configured to for the frequency domain multicarrier modulated signal is compressed processing, comprise that a grouping extracts common factor unit 1105, grouping extract common factor unit 1105 be configured to for to the frequency domain multicarrier modulated signal grouping extract common factor to realize the frequency domain compression function.The processing that common factor is extracted in grouping has specific descriptions in front, does not repeat them here.
The embodiment that Figure 11 d provides is corresponding with the embodiment of Fig. 4 d.According to Figure 11 d, frequency domain compressor reducer 1120 comprises time-frequency domain conversation processing unit 1101, compression processing unit 1123 and signal assemble and transmitting element 1103.Similar to the embodiment that Figure 11 a provides, time-frequency domain conversation processing unit 1101 is configured to for the time-domain signal that receives is carried out the conversion of time-frequency domain signal, time-domain signal be transformed to frequency domain.Signal assemble and transmitting element 1103, the compressed package after being configured to encapsulate and will encapsulate for the multicarrier modulated signal after compressing is issued BBU.Compression processing unit 1123 is configured to for the frequency domain multicarrier modulated signal is compressed processing, comprise that a bit blocks unit 1106, bit blocks unit 1106 and is configured to for the frequency domain multicarrier modulated signal being carried out low-order bit and/or high-order than blocking to realize the frequency domain compression function.Different according to system configuration, bit blocks the unit can realize that low-order bit break-in facility, high order bit break-in facility or configuration simultaneously or a high position and low level compare break-in facility.Therefore, further, be configured to also comprise the level estimation unit when realizing the low-order bit break-in facility when bit blocks unit 1106, be configured to estimate for multicarrier modulated signal being carried out noise level; Low level blocks the bit number determining unit, is configured to for the estimating noise level according to the output of level estimation unit, and be under acceptable terms guaranteeing that low level blocks the performance loss that brings, determine that suitable low level blocks bit number; Low-order bit blocks the unit, is configured to for blocking bit number according to the low level of determining, the low-order bit that described low level is blocked bit number blocks.Be configured to also comprise the dynamic range of signals statistic unit when realizing the high order bit break-in facility when bit blocks unit 1106, be configured to for to multicarrier modulated signal grouping carry out the dynamic range of signals statistics; A high position is blocked the bit number determining unit, is configured to for the mean value according to maximum or every group of signal level of every group of signal level, determines that a suitable high position blocks bit number; High order bit blocks the unit, is configured to for blocking bit number according to a high position of determining, the high order bit that a described high position is blocked bit number blocks.A concrete high position and/or low-order bit truncation be existing the specific descriptions in front, do not repeat them here.
The embodiment that Figure 11 e provides is corresponding with the embodiment of Fig. 4 e.According to Figure 11 e, frequency domain compressor reducer 1130 comprises time-frequency domain conversation processing unit 1101, compression processing unit 1124 and signal assemble and transmitting element 1103.Similar to the embodiment that Figure 11 a provides, time-frequency domain conversation processing unit 1101 is configured to for the time-domain signal that receives is carried out the conversion of time-frequency domain signal, time-domain signal be transformed to frequency domain.Signal assemble and transmitting element 1103, the compressed package after being configured to encapsulate and will encapsulate for the multicarrier modulated signal after compressing is issued BBU.Compression processing unit 1124 is configured to for the frequency domain multicarrier modulated signal is compressed processing, comprises that gap carrier wave deletion processing unit 1104 and grouping extract common factor unit 1105.Adopt the deletion of gap carrier wave process and divide into groups to extract common factor and process in conjunction with realizing the frequency domain compression function.The existing specific descriptions in specific implementation front of common factor unit 1105 extracted in gap carrier wave deletion processing unit 1104 and grouping, do not repeat them here.
The embodiment that Figure 11 f provides is corresponding with the embodiment of Fig. 4 f.According to Figure 11 f, frequency domain compressor reducer 1130 comprises time-frequency domain conversation processing unit 1101, compression processing unit 1125 and signal assemble and transmitting element 1103.Similar to the embodiment that Figure 11 a provides, time-frequency domain conversation processing unit 1101 is configured to for the time-domain signal that receives is carried out the conversion of time-frequency domain signal, time-domain signal be transformed to frequency domain.Signal assemble and transmitting element 1103, the compressed package after being configured to encapsulate and will encapsulate for the multicarrier modulated signal after compressing is issued BBU.Compression processing unit 1125 is configured to for the frequency domain multicarrier modulated signal is compressed processing, comprises that a gap carrier wave deletion processing unit 1104 and a bit block unit 1106.Adopt the deletion of gap carrier wave to process and bit truncation combination realizes the embodiment that the specific implementation of frequency domain compression function can provide in conjunction with prior figures 11b and Figure 11 d, gap carrier wave deletion processing unit 1104 and bit block existing specific descriptions the in specific implementation front of unit 1106, do not repeat them here.Similarly, in conjunction with when realizing the frequency domain compression, must first carry out that noise level is estimated and/or received signal strength is estimated in these two kinds of functions, then delete gap carrier wave and a high position and/or low-order bit and block and carry out the frequency domain compression.
Figure 12 a, 12b, 12c have provided respectively the Frequency Domain Solution depressor structural representation of expression different decompression schemes according to the embodiment of the present invention.
In Figure 12 a, Frequency Domain Solution depressor 1200 comprises resolution unit 1201, frequency domain decompress(ion) unit 1202.Resolution unit 1201 is configured to the compressed package that receives for parsing, obtains the signal after compression; Frequency domain decompress(ion) unit 1202 is configured to for the signal after the compression of resolution unit output is carried out the frequency domain decompress(ion).
In Figure 12 b, Frequency Domain Solution depressor 1210 comprises resolution unit 1201, frequency domain decompress(ion) unit 1212.Resolution unit 1201 is configured to the compressed package that receives for parsing, obtains the signal after compression; Frequency domain decompress(ion) unit 1202 is configured to for the signal after the compression of resolution unit output is carried out the frequency domain decompress(ion).In the present embodiment, the embodiment of corresponding diagram 10a, frequency domain decompress(ion) unit 1202 comprises that a grouping takes advantage of common factor amplifying unit 1204, and grouping takes advantage of common factor amplifying unit 1204 to be configured to for the signal times common factor after the compression on every group of subcarrier is amplified.
In Figure 12 c, Frequency Domain Solution depressor 1210 comprises resolution unit 1201, frequency domain decompress(ion) unit 1222.Resolution unit 1201 is configured to the compressed package that receives for parsing, obtains the signal after compression; Frequency domain decompress(ion) unit 1222 is configured to for the signal after the compression of resolution unit output is carried out the frequency domain decompress(ion).In the present embodiment, the embodiment of corresponding diagram 10b, frequency domain decompress(ion) unit 1222 comprises a sign bit expanding element 1205, sign bit expanding element 1205 is configured to for the truncated signal after the compression on each subcarrier being carried out the sign bit expansion.Bit number after expansion is determined by the specific implementation of BBU, such as is extended to 16 bit numbers.
Correspondence is united the Frequency Domain Solution depressor that adopts deletion gap carrier wave and grouping extraction common factor to carry out the frequency domain compression, can realize decompressing with reference to the Frequency Domain Solution depressor structure shown in Figure 12 b.
Correspondence is united employing deletion gap carrier wave and bit blocks the Frequency Domain Solution depressor that carries out the frequency domain compression, can realize decompressing with reference to the Frequency Domain Solution depressor shown in Figure 12 c.
Be the compression/decompression method of verifying multicarrier modulated signal of the present invention and the performance of compressor/decompressor, the below has provided by simulation calculation the error vector magnitude after the compression.Benchmark as a comparison, also emulation the error vector magnitude during without compression.In emulation, 6 footpath channels of LTE appraisal procedure definition have been adopted.Table 3 expression according to the embodiment of the present invention the performance simulation result.Table 3 has been listed simulation result, adopts scheme provided by the invention can obtain the compression ratio of 3.1 times, obtain simultaneously with without error vector magnitude close in the compression situation.
Table 3
Detect for the RACH targeting signal, from timing accuracy, false dismissal probability and false alarm probability performance index, the present invention is almost without any impact.
In emulation, supposing the system is operated at full capacity.In real system, most little area carriers different loads, consider the statistic multiplexing that zooms out in the light net, use the present invention and can obtain higher compression ratio.For example, under system's halfload condition of work, can obtain the compression ratio up to 5 times, thereby zoom out the bandwidth demand of light net in the Access Network of reduction based on centralized processing.Due to the compression ratio with high power, the invention enables the signal transmission of zooming out in the light net more effective, more convenient based on the deployment of the Access Network of centralized processing, cost is cheaper.For the mobile operator that rents backbone network, low data rate also means low lease cost.
The present invention can realize with hardware, software, firmware and their combination.One skilled in the art would recognize that also in can be on the signal bearing medium for any suitable data treatment system set statistical machine program product and embody the present invention.The sort signal bearing medium can be transmission medium or the recordable media that is used for machine sensible information, comprises magnetizing mediums, light medium or other suitable media.The example of recordable media comprises: the disk in hard disk drive or floppy disk, be used for CD, the tape of CD-ROM drive and thinkable other media of those skilled in the art.One skilled in the art would recognize that any communication equipment with suitable programmed device all can carry out the step as the inventive method that embodies in program product.
Should be appreciated that from foregoing description, in the situation that do not break away from spirit of the present invention, can modify and change each execution mode of the present invention.For example, embodiments of the present invention are described as an example of up multi-carrier signal example, it is illustrative that but the description in this specification is only used for, and should not be considered to restrictive, those skilled in the art understands the present invention and also can be applied to the multi-carrier signal of other occasion from the description of this specification.Scope of the present invention only is subjected to the restriction of claims.
Claims (25)
1. the compression method of a multicarrier modulated signal, comprise,
The time domain multicarrier modulated signal is processed by time-frequency domain conversation, transformed to frequency domain;
The frequency domain multicarrier modulated signal is compressed processing;
Multicarrier modulated signal after compression is encapsulated and sends.
2. method according to claim 1, is characterized in that, described the frequency domain multicarrier modulated signal is compressed to process comprise deletion gap carrier wave.
3. method according to claim 1 and 2, is characterized in that, described the frequency domain multicarrier modulated signal is compressed to process comprise the frequency domain multicarrier modulated signal carried out low-order bit and/or high order bit blocks.
4. method according to claim 1 and 2, is characterized in that, described the frequency domain multicarrier modulated signal is compressed to process comprise,
Common factor is extracted in grouping to the frequency domain multicarrier modulated signal.
5. method according to claim 3, is characterized in that, describedly the frequency domain multicarrier modulated signal is carried out low-order bit block and comprise,
Multicarrier modulated signal is carried out noise level to be estimated;
Estimating according to noise level, is under acceptable terms guaranteeing that low level blocks the performance loss that brings, and determines the suitable bit number that blocks, and the described low-order bit that blocks bit number is blocked.
6. method according to claim 3, is characterized in that, describedly the frequency domain multicarrier modulated signal is carried out high order bit block and comprise,
The dynamic range of signals statistics is carried out in grouping to multicarrier modulated signal; Determine that according to the maximum of every group of signal level or the mean value of every group of signal level high order bit blocks bit number and the described high order bit that blocks bit number is blocked.
7. method according to claim 1, is characterized in that, to the RACH targeting signal, described the time domain multicarrier modulated signal processed by time-frequency domain conversation, and the process that transforms to frequency domain comprises, frequency band is moved, and the RACH targeting signal is moved frequency band central authorities;
Filtering extraction filters described time domain multicarrier modulated signal and extracts sampling point,
Time-frequency domain conversation is processed, and determines suitable FFT window, carries out the FFT computing, obtains the RACH sequence of frequency domain.
8. method according to claim 2, is characterized in that, described gap carrier wave comprises the signal on boundary belt, direct current subcarrier or never call Resource Block.
9. the decompressing method of a multicarrier modulated signal, comprise,
The compressed package that parsing receives obtains the signal after compression;
Signal after compression is carried out the frequency domain decompress(ion);
Data after decompress(ion) are carried out data to be processed.
10. method according to claim 9, is characterized in that, described frequency domain decompress(ion) comprises that the truncated signal after the compression on each subcarrier is carried out sign bit to be expanded.
11. method according to claim 9 is characterized in that, described frequency domain decompress(ion) comprises the signal times common factor after the compression on every group of subcarrier is amplified.
12. a frequency domain compressor reducer comprises: the time-frequency domain conversation processing unit, be used for the time domain multicarrier modulated signal is processed by FFT, transform to frequency domain;
Compression processing unit is used for the frequency domain multicarrier modulated signal is compressed processing;
Signal assemble and transmitting element, the multicarrier modulated signal after being used for compressing encapsulates and sends.
13. frequency domain compressor reducer according to claim 12 is characterized in that, described compression processing unit comprises gap carrier wave deletion processing unit, is used for deleting the gap carrier wave of described frequency domain multicarrier modulated signal.
14. according to claim 12 or 13 described frequency domain compressor reducers is characterized in that, described compression processing unit comprises,
Bit blocks the unit, is used for the frequency domain multicarrier modulated signal is carried out low-order bit and/or high-order than blocking.
15. according to claim 12 or 13 described frequency domain compressor reducers is characterized in that, described compression processing unit comprises,
Extraction common factor unit is used for frequency domain multicarrier modulated signal grouping extraction common factor.
16. frequency domain compressor reducer according to claim 14 is characterized in that, described bit blocks the unit and comprises,
The level estimation unit is used for that multicarrier modulated signal is carried out noise level and estimates;
Low level blocks the bit number determining unit, is used for the estimating noise level according to the output of level estimation unit, is under acceptable terms guaranteeing that low level blocks the performance loss that brings, and determines that suitable low level blocks bit number;
Low-order bit blocks the unit, is used for blocking bit number according to the low level of determining, the low-order bit that described low level is blocked bit number blocks.
17. frequency domain compressor reducer according to claim 14 is characterized in that, described bit blocks the unit and comprises,
The dynamic range of signals statistic unit is used for multicarrier modulated signal is divided into groups to carry out the dynamic range of signals statistics;
A high position is blocked the bit number determining unit, is used for the mean value according to maximum or every group of signal level of every group of signal level, determines that a suitable high position blocks bit number;
High order bit blocks the unit, is used for blocking bit number according to a high position of determining, the high order bit that a described high position is blocked bit number blocks.
18. frequency domain compressor reducer according to claim 12 is characterized in that, described time-frequency domain conversation processing unit further comprises,
Frequency band is moved the unit, is used for that the RACH targeting signal is moved frequency band central;
The filtering extraction unit is used for filtering described time domain multicarrier modulated signal and extracting sampling point.
19. frequency domain compressor reducer according to claim 13 is characterized in that, described gap carrier wave comprises the signal on boundary belt, direct current subcarrier or never call Resource Block.
20. frequency domain compressor reducer according to claim 12, described compressor reducer are configured on far end radio frequency head RRH equipment.
21. a Frequency Domain Solution depressor comprises,
Resolution unit be used for to be resolved the compressed package that receives, and obtains the signal after compression;
Frequency domain decompress(ion) unit is used for the signal after the compression of resolution unit output is carried out the frequency domain decompress(ion).
22. Frequency Domain Solution depressor according to claim 21 is characterized in that, described frequency domain decompress(ion) unit
Comprise and divide into groups to take advantage of the common factor amplifying unit, be used for the signal times common factor after the compression on every group of subcarrier is amplified.
23. Frequency Domain Solution depressor according to claim 21 is characterized in that, described frequency domain decompress(ion) unit comprises the sign bit expanding element, is used for the truncated signal after the compression on each subcarrier is carried out the sign bit expansion.
24. Frequency Domain Solution depressor according to claim 21 is characterized in that, described Frequency Domain Solution depressor is configured on baseband processing equipment.
25. the treatment system of a uplink multi-carrier modulation signal comprises,
Far end radio frequency head RRH equipment, described far end radio frequency head RRH equipment comprises the described frequency domain compressor reducer of any one in claim 12-20;
Baseband processing equipment, described baseband processing equipment comprise the described Frequency Domain Solution depressor of any one in claim 21-24;
Fiber optic network or Ethernet are in order to transmit the signal between far end radio frequency head RRH equipment and baseband processing equipment.
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