CN105007253B - The wireless point-to-point trunk transmission system of millimeter wave based on SC-FDM - Google Patents
The wireless point-to-point trunk transmission system of millimeter wave based on SC-FDM Download PDFInfo
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- CN105007253B CN105007253B CN201510477942.3A CN201510477942A CN105007253B CN 105007253 B CN105007253 B CN 105007253B CN 201510477942 A CN201510477942 A CN 201510477942A CN 105007253 B CN105007253 B CN 105007253B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
- H04L27/36—Modulator circuits; Transmitter circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
- H04L27/38—Demodulator circuits; Receiver circuits
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Abstract
The invention discloses a kind of millimeter wave based on SC-FDM wirelessly point-to-point trunk transmission systems, including SC-FDM transmitter, SC-FDM receiver and antenna system.SC-FDM transmitter includes SC-FDM baseband transmission processing module and radiofrequency emitting module, and user's bit data flows through SC-FDM baseband transmission processing module processing generation base band frame data and launched by radiofrequency emitting module through antenna system；SC-FDM receiver includes SC-FDM Baseband Receiver processing module and Receiver Module, the radiofrequency signal of antenna system reception enters SC-FDM Baseband Receiver processing module after Receiver Module is handled, and recovers user's bit data flow by SC-FDM Baseband Receiver processing module.Wirelessly signal peak-to-average power power ratio can be effectively reduced in point-to-point trunk transmission system to millimeter wave based on SC-FDM of the invention, improve band efficiency, it reduces requirement to radio-frequency power amplifier and improves transmission power, and effectively Effect of Carrier Frequency Offset and the throughput of the wireless point-to-point trunk transmission system of millimeter wave can be improved.
Description
Technical field
The present invention relates to a kind of wireless communication system, the wireless point-to-point trunk transmission system of especially a kind of millimeter wave.
Background technique
In mobile communication system, millimeter wave is more and more used to remote point-to-point wireless primary transmission.
Millimeter wave needs very high transmission power because of its extremely strong transmission attenuation (the extremely strong air attenuations by absorption of certain frequency ranges).
OFDM (orthogonal multicarrier modulation) is used as a kind of advanced transmission technology, has been used in nearly all wireless system, such as
LTE, WIFI etc. are all based on OFDM technology.But the PAPR of OFDM (peak power and average power ratio) is usually 2 or more,
And the PAPR of single carrier (SC) system is usually closer to 1；To make power amplifier export identical transmitting in linear operating region
Power, the maximum transmission power for the power amplifier that theoretically ofdm system uses have to the power amplification than single-carrier system
High 6dB of device or so generally wants high 10dB in Project Realization.This not only reduces the power efficiency of amplifier, and to millimeter
Wave power amplifier designs are a very big challenges.Therefore, in the point-to-point primary transmission of millimeter wave, single carrier (SC) is modulated still
It is so main design scheme.Ofdm system effectively can improve communication using MIMO multi-antenna technology relative to SC system
The capacity of capacity, communication is usually the key technical index of trunk transmission system, and carrier wave communication system hoist capacity needs
Using complicated XPIC technology, and it could support up two antennas in Project Realization, i.e. 2 transmission antennas, 2 receiving antennas
System；Single carrier frequency division is multiplexed (SC-FDM) technology and uses single carrier, but using the technology of similar OFDM in signal generation, i.e.,
The lower PAPR of single-carrier system is remained, what also be can be convenient promotes the capacity of channel using MIMO multi-antenna technology, and
The frequency equalization technique that similar OFDM can be used, to effectively resist multipath fading.Therefore, it is set using the technology of SC-FDM
The wireless point-to-point trunk transmission system of millimeter wave is counted, the power that can be effectively solved in the point-to-point trunk communication of millimeter wave is asked
Topic, while the capacity and anti fading performance of the lifting system of MIMO technology low cost also can be used.
Summary of the invention
Goal of the invention: in order to overcome the deficiencies in the prior art, the present invention provides one kind and is both able to maintain communication system
Efficiency power amplifier, and the millimeter wave based on SC-FDM of message capacity and anti-multipath fading wirelessly point-to-point main line can be promoted
Transmission system.
Technical solution: to achieve the above object, a kind of wireless point-to-point main line of millimeter wave based on SC-FDM of the invention
Transmission system, it is characterised in that: including SC-FDM transmitter, SC-FDM receiver and antenna system；
The SC-FDM transmitter includes several SC-FDM baseband transmission processing modules and radiofrequency emitting module, described
The quantity of SC-FDM baseband transmission processing module and the polarization direction number of antenna system are identical, and user's bit data flows through SC-FDM
The processing of baseband transmission processing module generates base band frame data and is launched by radiofrequency emitting module through antenna system；The SC-FDM
Baseband transmission processing module successively specifically includes from front to back: scrambling/Error Correction of Coding/intertexture/constellation modulation module, splitter,
If main line string turns and sub-carrier mapping module, the M of module and the symbol data subflow processing module of N point DFT block, insertion pilot tone
Point IDFT module simultaneously turns string module plus cyclic prefix module, framing module and D/A converter module；Wherein M, N are positive whole
Number, M > N.
The SC-FDM receiver includes SC-FDM Baseband Receiver processing module and Receiver Module, and antenna system connects
The radiofrequency signal of receipts enters SC-FDM Baseband Receiver processing module after Receiver Module is handled, by SC-FDM Baseband Receiver
Reason module recovery goes out user's bit data flow；The SC-FDM Baseband Receiver processing module successively includes several from front to back
SC-FDM Baseband Receiver front end processing block, channel estimation/channel equalization/subcarrier inverse mapping module and several SC-FDM
Baseband Receiver back end processing module, the SC-FDM Baseband Receiver front end processing block and SC-FDM Baseband Receiver back-end processing
The quantity of module is identical as the polarization direction number of antenna system；The SC-FDM Baseband Receiver front end processing block from front to back according to
Secondary to specifically include: analog-to-digital conversion module, frame processing module go cyclic prefix module, string to turn simultaneously module and M point DFT block；Institute
It states SC-FDM Baseband Receiver back end processing module successively to specifically include from front to back: if main line N point IDFT module and and turn string
Substream of data processing module, combiner and the descrambling/error correction decoding/deinterleaving/constellation demodulation module of module.
Further, data handling procedure are as follows:
In transmitting terminal, SC-FDM emits user's bit that function handles number equal with antenna system polarization direction number simultaneously
The processing mode of data flow, every road user bit data flow is all the same, and user's bit data flow is scrambled, Error Correction of Coding, friendship
It knits, constellation adjustment generates symbol data；If symbol data streams are divided into main line symbol data subflow after splitter；Every road symbol
Number subflow inputs DFT block after string turns simultaneously, and the DFT output of each road symbol data subflow and pilot data are through subcarrier
It is mapped on different subcarriers after mapping block in frequency domain and forms subcarrier data；All subcarrier datas are through M point
After IDFT processing, quilt simultaneously turns string module transitions as serial time signal；M point serial time signal is previously inserted into M/L dot cycle
SC-FDM symbol is generated after prefix protection interval, several SC-FDM symbols and frame head are formed complete transmission frame by framing module
Give D/A converter module；Up-conversion of the analog baseband signal through radiofrequency emitting module of D/A converter module output, filtering, function
The processing such as rate amplification generate radiofrequency signal, and radiofrequency signal is launched through antenna system；Wherein L is positive integer, and M can be divided exactly by L.
In receiving end, Receiver Module is penetrated to the number equal with antenna system polarization direction number of antenna system reception
The processing such as frequency signal amplifies, down coversion, filtering output analog baseband signal, every road analog baseband signal are turned by modulus respectively
Change module samples generate digital baseband signal, digital baseband signal through frame processing module, go cyclic prefix module, string turn and mould
It is divided into multiple substream of data after block, M point DFT transform module, channel estimation/equalization/subcarrier inverse mapping module；Each data
Flow through N point IDFT block transforms and and turn string resume module after revert to constellation symbol stream all the way；The constellation symbol stream of recovery according to
It is secondary to recover user's bit data flow after constellation demodulation, deinterleaving, error correction decoding, descrambling.
Further, the SC-FDM transmitter includes two SC-FDM baseband transmission processing modules, the radio-frequency transmissions
Module is 2 road radiofrequency emitting modules；The SC-FDM Baseband Receiver processing module includes at two SC-FDM Baseband Receiver front ends
Module, channel estimation/channel equalization/subcarrier inverse mapping module and two SC-FDM Baseband Receiver back end processing modules are managed,
The Receiver Module is 2 road Receiver Modules；The antenna system is 2x2 multiaerial system.
The utility model has the advantages that wirelessly letter can be effectively reduced in point-to-point trunk transmission system to the millimeter wave of the invention based on SC-FDM
Number peak-to-average power ratio improves band efficiency, reduces the requirement to radio-frequency power amplifier and improves transmission power, and can be effective
It improves Effect of Carrier Frequency Offset and improves the throughput of the wireless point-to-point trunk transmission system of millimeter wave.
Detailed description of the invention
Attached drawing 1 is SC-FDM transmitter；
Attached drawing 2 is SC-FDM receiver；
Attached drawing 3 is 2x2SC-FDM multiaerial system transmitter；
Attached drawing 4 is 2x2SC-FDM multiaerial system receiver；
Attached drawing 5 is 2x2SC-FDM multiaerial system Baseband Receiver front end processing block；
Attached drawing 6 is 2x2SC-FDM multiaerial system Baseband Receiver back end processing module.
Specific embodiment
The present invention will be further explained with reference to the accompanying drawing.
Such as the wireless point-to-point primary transmission a single aerial system of attached drawing 1 and the attached millimeter wave shown in Fig. 2 based on SC-FDM, packet
It includes including SC-FDM transmitter, SC-FDM receiver and antenna system.
Such as attached drawing 1, SC-FDM transmitter includes SC-FDM baseband transmission processing module and radiofrequency emitting module, user's ratio
Special data flow through SC-FDM baseband transmission processing module processing generation base band frame data and are sent out by radiofrequency emitting module through antenna system
It is shot out；SC-FDM baseband transmission processing module successively specifically includes from front to back: scrambling/Error Correction of Coding/intertexture/constellation modulation
If module, splitter, main line string turn and the son of module and the symbol data subflow processing module of N point DFT block, insertion pilot tone carries
Wave mapping block, M point IDFT module simultaneously turn string module plus cyclic prefix module, framing module and D/A converter module；Its
Middle M, N are positive integer, M > N.
Such as attached drawing 2, SC-FDM receiver includes SC-FDM Baseband Receiver processing module and Receiver Module, aerial system
Received radiofrequency signal of uniting enters SC-FDM Baseband Receiver processing module after Receiver Module is handled, and is connect by SC-FDM base band
It receives processing module and recovers user's bit data flow；SC-FDM Baseband Receiver processing module successively includes SC-FDM base from front to back
At band receiving front-end processing module, channel estimation/channel equalization/subcarrier inverse mapping module and SC-FDM Baseband Receiver rear end
Manage module；SC-FDM Baseband Receiver front end processing block successively specifically includes from front to back: analog-to-digital conversion module, frame handle mould
Block goes cyclic prefix module, string to turn simultaneously module and M point DFT block；SC-FDM Baseband Receiver back end processing module is from front to back
Successively specifically include: if main line N point IDFT module and and turn string module substream of data processing module, combiner and solution
Disturb/error correction decoding/deinterleaving/constellation demodulation module.
Its data handling procedure are as follows:
In transmitting terminal, SC-FDM emits user's bit that function handles number equal with antenna system polarization direction number simultaneously
The processing mode of data flow, every road user bit data flow is all the same, and user's bit number stream is according to scrambled, Error Correction of Coding, friendship
It knits, constellation adjustment generates symbol data；Wherein scrambling is to the randomization of user's bit data to guarantee final life
It is consistent at the average energy of data.Error Correction of Coding generates redundant data according to input data to guarantee to occur in data transmission procedure
Mistake can be repaired, guarantee data transmission reliability.Interweave and randomization is carried out to data in time, with receiving end
Deinterleaving collaboration guarantee that the error in data that occurs is random in time in transmission process.Bit information is reflected in constellation modulation
Symbol data is penetrated into, the utilization efficiency of channel can be improved.If symbol data streams are divided into main line symbolic number after splitter
According to subflow；Every road symbol data subflow inputs DFT (discrete Fourier transform) module, each road symbol data subflow after string turns simultaneously
DFT output and pilot data be mapped in frequency domain on different subcarriers after sub-carrier mapping module and form subcarrier
Data；All subcarrier datas through M point IDFT (Inverse Discrete Fourier Transform) processing after, quilt and turn string a module transitions be serial
Time signal；Generation SC-FDM (the single carrier frequency after being previously inserted into M/L dot cycle prefix protection interval of M point serial time signal
Point multiplexing) symbol, several SC-FDM symbols and frame head form complete transmission frame and give D/A converter module by framing module；
The processing such as up-conversion, filtering, power amplification of the analog baseband signal of D/A converter module output through radiofrequency emitting module generate
Radiofrequency signal, radiofrequency signal are launched through antenna system；Wherein L is positive integer, and M can be divided exactly by L.
In receiving end, Receiver Module is penetrated to the number equal with antenna system polarization direction number of antenna system reception
The processing such as frequency signal amplifies, down coversion, filtering output analog baseband signal, every road analog baseband signal are turned by modulus respectively
Change module samples generate digital baseband signal, digital baseband signal through frame processing module, go cyclic prefix module, string turn and mould
It is divided into multiple substream of data after block, M point DFT transform module, channel estimation/equalization/subcarrier inverse mapping module；Each data
Flow through N point IDFT block transforms and and turn string resume module after revert to constellation symbol stream all the way；The constellation symbol stream of recovery according to
It is secondary to recover user's bit data flow after constellation demodulation, deinterleaving, error correction decoding, descrambling.
Basic structure substantially phase if attached drawing 3 show 2x2SC-FDM multiaerial system to attached drawing 6, with a single aerial system
Together, wherein SC-FDM transmitter includes two SC-FDM baseband transmission processing modules, and radiofrequency emitting module is 2 tunnel radio-frequency transmissions moulds
Block；SC-FDM Baseband Receiver processing module include two SC-FDM Baseband Receiver front end processing blocks, channel estimation/channel it is equal
Weighing apparatus/subcarrier inverse mapping module and two SC-FDM Baseband Receiver back end processing modules, Receiver Module are that 2 road radio frequencies connect
Receive module；Antenna system is 2x2 multiaerial system.2 institute of baseband transmission processing module 1 and baseband transmission processing module of attached drawing 3
The processing done is similar with the baseband transmission processing module of the SC-FDM in Fig. 1, the difference is that 1 He of baseband transmission processing module
The position that baseband transmission processing module 2 is inserted into the subcarrier of pilot tone is different, estimates so as to the transmission channel to multiple antennas
Meter.
In the existing millimeter wave based on single-carrier technology wirelessly point-to-point primary transmission scheme, it is necessary to using high complicated
Degree, high-cost XPIC technology carry out the capacity of lifting system, and are difficult to promote 2 times or more；And in millimeter-wave systems
Possible multipath can not effective solution.After SC-FDM technology, millimeter wave is effectively being kept to send system power amplification
It can be using 2 times of the capacity or 2 times or more of the promotion communication of MIMO multi-antenna technology low cost while device efficiency；Simultaneously
Also the multipath fading problem in the wireless point-to-point communication of effective solution.Compared with the communication system phase based on single carrier
Than the throughput that, the invention can effectively improve the wireless point-to-point trunk transmission system of millimeter wave, it is multipath fading to improve system
Energy.Compared with the communication system based on OFDM compare, which can be effectively reduced signal peak-to-average power power ratio, improve band utilization
Rate reduces the requirement to radio-frequency power amplifier and improves transmission power.
The above is only a preferred embodiment of the present invention, it should be pointed out that: for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (2)
1. a kind of wireless point-to-point trunk transmission system of millimeter wave based on SC-FDM, it is characterised in that: emit including SC-FDM
Machine, SC-FDM receiver and antenna system；
The SC-FDM transmitter includes several SC-FDM baseband transmission processing modules and radiofrequency emitting module, the SC-
The quantity of FDM baseband transmission processing module and the polarization direction number of antenna system are identical, through SC-FDM baseband transmission processing module
Processed user's bit data flow is launched by radiofrequency emitting module through antenna system；The SC-FDM baseband transmission processing
Module successively specifically includes from front to back: if scrambling/Error Correction of Coding/intertexture/constellation modulation module, splitter, main line string turn simultaneously
The sub-symbol data stream process route of module and N point DFT block, the sub- carrier frequency of user that DFT block is generated and insertion pilot tone
Sub- carrier frequency mapping block that carrier frequency is synthesized, M point IDFT module and turn string module plus cyclic prefix module, framing module with
And D/A converter module；Wherein M, N are positive integer, M > N；
The SC-FDM receiver includes SC-FDM Baseband Receiver processing module and Receiver Module, antenna system reception
Radiofrequency signal enters SC-FDM Baseband Receiver processing module after Receiver Module is handled, and handles mould by SC-FDM Baseband Receiver
Block recovers user's bit data flow；The SC-FDM Baseband Receiver processing module successively includes several SC-FDM from front to back
Baseband Receiver front end processing block, channel estimation/channel equalization/subcarrier inverse mapping module and several SC-FDM base band connect
Receipts back end processing module, the SC-FDM Baseband Receiver front end processing block and SC-FDM Baseband Receiver back end processing module
Quantity is identical as the polarization direction number of antenna system；The SC-FDM Baseband Receiver front end processing block is successively specific from front to back
Include: analog-to-digital conversion module, frame processing module, cyclic prefix module, string is gone to turn simultaneously module and M point DFT block；The SC-
FDM Baseband Receiver back end processing module successively specifically includes from front to back: if main line N point IDFT module and and turning string module
Sub-data flow process circuit, combiner and descrambling/error correction decoding/deinterleaving/constellation demodulation module；
Its data handling procedure are as follows:
In transmitting terminal, SC-FDM emits user's bit number that function handles number equal with antenna system polarization direction number simultaneously
According to the processing mode of every road user bit data is all the same, and user's bit data is scrambled, Error Correction of Coding, intertexture, constellation tune
Whole generation symbol data；Symbol data streams are divided into several way symbol data streams after splitter；Every way symbol data
It flows through and inputs DFT block after string turns simultaneously, the DFT output of each way symbol data streams and pilot data are through sub-carrier mapping module
It is mapped to afterwards in frequency domain on different subcarriers and forms subcarrier data；All subcarrier datas through M point IDFT processing after,
Quilt simultaneously turns a string module transitions as serial time signal；M point serial time signal is previously inserted into M/L dot cycle prefix protection interval
SC-FDM symbol is generated afterwards, several SC-FDM symbols and frame head are formed complete transmission frame and give digital-to-analogue conversion by framing module
Module；Up-conversion of the analog baseband signal through radiofrequency emitting module of D/A converter module output, filtering, power amplification processing life
At radiofrequency signal, radiofrequency signal is launched through antenna system；Wherein L is positive integer；
In receiving end, Receiver Module believes the radio frequency of the number equal with antenna system polarization direction number of antenna system reception
It number amplifies, down coversion, filtering processing output analog baseband signal, every road analog baseband signal is respectively by analog-to-digital conversion module
Sampling generate digital baseband signal, digital baseband signal through frame processing module, go cyclic prefix module, string turn and module, M point
It is divided into multiple sub-data flows after DFT transform module, channel estimation/equalization/subcarrier inverse mapping module；Each sub-data flow is through N
Point IDFT block transforms and and turn string resume module after revert to constellation symbol stream all the way；The constellation symbol stream of recovery is successively through star
User's bit data flow is recovered after seat demodulation, deinterleaving, error correction decoding, descrambling.
2. the wireless point-to-point trunk transmission system of millimeter wave according to claim 1, it is characterised in that: the SC-FDM hair
Penetrating machine includes two SC-FDM baseband transmission processing modules, and the radiofrequency emitting module is 2 road radiofrequency emitting modules；The SC-
FDM Baseband Receiver processing module includes two SC-FDM Baseband Receiver front end processing blocks, channel estimation/channel equalization/sub- load
Wave inverse mapping module and two SC-FDM Baseband Receiver back end processing modules, the Receiver Module are 2 road radio frequency receptions
Module；The antenna system is 2x2 multiaerial system.
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| CN108965185B (en) * | 2017-05-26 | 2020-11-13 | 中国移动通信集团公司 | Method and device for hybrid modulation and demodulation of multiple carriers |
| WO2019047246A1 (en) | 2017-09-11 | 2019-03-14 | Huawei Technologies Co., Ltd. | Methods and apparatus for polar encoding |
| CN113114298B (en) * | 2021-03-31 | 2022-07-12 | 德氪微电子(深圳)有限公司 | Display device adopting millimeter wave communication |
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|---|---|---|---|---|
| CN101523791A (en) * | 2006-10-04 | 2009-09-02 | 高通股份有限公司 | Uplink ACK transmission for SDMA in a wireless communication system |
| CN102598530A (en) * | 2009-09-16 | 2012-07-18 | Lg电子株式会社 | Method and apparatus for transmitting a reference signal in a multi-antenna system |
| CN204859219U (en) * | 2015-08-06 | 2015-12-09 | 江苏技睿通信科技有限公司 | Point -to -point trunk transmission system that millimeter wave is wireless based on SC -FDM |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101523791A (en) * | 2006-10-04 | 2009-09-02 | 高通股份有限公司 | Uplink ACK transmission for SDMA in a wireless communication system |
| CN102598530A (en) * | 2009-09-16 | 2012-07-18 | Lg电子株式会社 | Method and apparatus for transmitting a reference signal in a multi-antenna system |
| CN204859219U (en) * | 2015-08-06 | 2015-12-09 | 江苏技睿通信科技有限公司 | Point -to -point trunk transmission system that millimeter wave is wireless based on SC -FDM |
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