CN100508413C - Method and equipment for reduced real-time signal processing in TDD-CDMA telecommunications system - Google Patents
Method and equipment for reduced real-time signal processing in TDD-CDMA telecommunications system Download PDFInfo
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- CN100508413C CN100508413C CNB028289226A CN02828922A CN100508413C CN 100508413 C CN100508413 C CN 100508413C CN B028289226 A CNB028289226 A CN B028289226A CN 02828922 A CN02828922 A CN 02828922A CN 100508413 C CN100508413 C CN 100508413C
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Abstract
There is disclosed a method of and arrangement for signal processing in a digital telecommunications system operating in a Time Division Duplex (TDD)-Code Division Multiple Access (CDMA) mode, wherein a plurality of users simultaneously transmit signals to a receiving unit of a radio access unit. The signals are comprises of a denumerable number of elements, and these signals are simultaneously processed using a signal processing algorithm. Before processing of the signals, comprised in the original signal received by the receiving unit of the radio access unit, an assessment is made of elements that are likely to contain relevant information. Said processing is performed by said elements, thereby reducing complexity and processing time of the signal processing algorithm used.
Description
Technical field
The present invention relates to a kind ofly in time division duplex Code Division Multiple Access (TDD-CDMA) telecommunication system, be used for method for processing signals, wherein a plurality of users send signal to a radio access unit simultaneously at least one channel, each all comprises unique sequence spreading in these signals, and these signals are received by described addressed location and handle simultaneously with a kind of signal processing algorithm, this signal processing algorithm comprises the step of utilizing sequence spreading and channel impulse structure convolution matrix, wherein by reducing the quantity of element in the described convolution matrix, may comprise the element of relevant information and utilize the described element that may comprise relevant information to construct the complexity that described convolution matrix reduces described signal processing algorithm by evaluation.Described evaluation comprises the identification sequence spreading corresponding with idle signal and ignores step with the corresponding sequence spreading of idle signal.
The invention still further relates to and a kind ofly in time division duplex Code Division Multiple Access (TDD-CDMA) telecommunication system, be used for signal processing apparatus, wherein a plurality of users send signal to a radio access unit simultaneously at least one channel, each all comprises unique sequence spreading in these signals, described device comprises and is used to receive the device of described signal and is used to utilize a kind of signal processing algorithm to handle the device of described signal simultaneously, the described device that is used for handling simultaneously is arranged for utilizing described sequence spreading and channel impulse structure convolution matrix, the described device that wherein is used for handling simultaneously also is arranged for reducing by the quantity that reduces described convolution matrix element the complexity of described signal processing algorithm, wherein said device also comprises the device that is used to evaluate the element that may comprise relevant information, and the described device that wherein is used for handling simultaneously is arranged for utilizing the described element that may comprise relevant information to construct described convolution matrix, and the described device that wherein is used to evaluate is arranged for discerning the sequence spreading corresponding with idle signal and ignores the sequence spreading corresponding with idle signal.
The present invention also relates to a kind of radio access unit of in time division duplex Code Division Multiple Access (TDD-CDMA) telecommunication system, using, it comprises signal processing apparatus, this signal processing apparatus comprises the device that is used for decomposing according to the unique sequence spreading that is included in each signal a plurality of signals, and described signal processing apparatus comprises also and is used to evaluate the device of the element that may comprise relevant information and is used for utilizing at least the described device that may comprise the element structure convolution matrix of relevant information that the described device that wherein is used to evaluate is arranged for discerning the sequence spreading corresponding with idle signal and ignores the sequence spreading corresponding with idle signal.
Background technology
In European patent application EP 1,235, described aforesaid device in 360, it discloses a kind of method for processing signals and device of being arranged in the CDMA telecommunication system, and it is made of channel estimating part, user's determining section, Path selection part and joint-detection demodulation part.Which user is described user's determining section determine to comprise according to the signal power that receives in described associated detecting method.In this document, also propose, can reduce the amount of calculation that in joint-detection, relates to less than the user's of threshold value signal by getting rid of signal power.
European patent application EP 1,077,51 disclose a kind of device, and wherein a plurality of matched filters extract channel estimation value corresponding to a plurality of users by finding with the correlation of received signal.A plurality of threshold process parts are carried out threshold process according to utilization corresponding to the estimating power value of a plurality of users' channel estimation value acquisition.Joint-detection is partly utilized through the channel estimation value of described threshold process and is carried out matrix computations.In order to increase the precision of signal processing method, utilize threshold process partly to get rid of in the joint detection algorithm performance number less than the received signal part of threshold value.
At " Low Computational Complexity Multiuser Detection UsingMultibeam Antennas " by Xiaoming Yu et al, Vehicular TechnologyConference, 48th IEEE, 18-21 May 1998, New York, proposed among the USA by reduce carrying out joint-detection number of users, reduce the computation complexity in the associated detecting method by only considering user in the main beam of multi-beam antenna.
In mobile communication, a plurality of mobile devices send signal to the individual access unit simultaneously, and this addressed location links to each other with network.In order to distinguish the unlike signal that sends by a plurality of mobile devices, introduced multiple division-multichannel-access technique in the practice.Because the speed of information exchange is higher relatively in the third generation (3G) mobile radio system, these technology are particularly important to the 3G system, although they can be different application are set.
Division-multichannel-access technique is actually multiplexing technique.Can distinguish some division-multichannels-access technique, frequency division multiple access (FDMA), Code Division Multiple Access (CDMA) and time-division multiple access (TDMA) (TDMA) are arranged in them.
In FDMA each signal by with different frequency band transmission to radio access unit.Addressed location is distinguished them according to the frequency band of each signal.
In TDMA, sent one by one, and addressed location receives the partial information of each signal subsequently.
The signal of each mobile device comprises a unique code, a spreading code in CDMA, and addressed location can be distinguished these codes, and and then distinguishes different signals.
In above-mentioned, signal is assumed that simplex signaling.Because communication is two-way, thereby needs duplex signaling.For example, time division duplex (TDD) is a kind of known duplex technology based on TDMA.In tdd mode, the signal flow of the radio access unit of coming in and going out is sent on channel in succession.This can be a symmetry and asymmetric, depends on system requirements.In symmetrical tdd mode, described addressed location keeps identical transmission capacity, the sequence of transmission capacity that for example replaces back and forth on both direction.
Wherein, some 3G mobile radio systems use CDMA with its tdd mode.This TDD-CDMA technology (is also referred to as time-division-Code Division Multiple Access: TD-CDMA) be the combination of above-mentioned FDMA, CDMA and TDMA/TDD technology.The composite signal that is received by radio access unit is by by the frequency band division with FDMA structure.Each frequency band or channel comprise a plurality of synchronous signals of some mobile devices.Synchronous signal in frequency band range comprises a unique code, sequence spreading or spreading code separately, thereby can be distinguished by their CDMA structure.Subsequently, in a frequency band range, addressed location receives the composite signal of different mobile device groups, and this composite signal is arranged in the sub-district that described addressed location covers.Set up duplex, be attached to the transmission of different user groups whereby, just can be sent back to mobile device to signal by additional TDD characteristic (CDMA is put in the tdd mode).
TDD-CDMA is that the signal processing step in the radio access unit has increased bigger complexity.Concerning real time data processing, for example the sequence spreading of a large number of users or the signal processing algorithm of spreading code can be discerned and distinguish to voice must realization as quickly as possible.Be used in the least possible calculation procedure, to finish this task to the algorithm of signal decoding.
In mobile radio system, the identification and the processing of a plurality of signals is called joint-detection (JD) based on TDD-CDMA.The main target of this JD technology is to eliminate to disturb.Will discern two kinds of important interference types in CDMA: intersymbol interference (ISI) and multiple access are disturbed (MAI).
Intersymbol interference is to be caused by the channel impulse response of used channel (CIR).CIR is the impulse response to the channel of the δ signal that is sent by mobile device.Because the signal reflex on along it to the propagation path of visit unit, for example with respect to building, trees, mountain and other reflected by objects along the road, this signal trends towards thickening.Because mobile device moves in the environment of being everlasting, CIR is with time to time change.Intersymbol interference (ISI) is that mobile device sends to the interference between two continuous symbols in the signal of radio access unit, and this interference is caused by the fuzzy of signal.
Another interference source relevant with the orthogonality of spreading code is the main cause that multiple access is disturbed among the CDMA.It is a plurality of interference between signals that addressed location receives simultaneously that multiple access is disturbed (MAI).The spreading code of boundary is not quadrature (because multipath transmisstion or other disturbing factor) to delimit each other from the signal of multiple arrangement if be used for, and addressed location may can't be distinguished the signal of different coding to a certain extent.Interference between these a plurality of signals that will cause sending simultaneously.
In order to eliminate effectively from the interference that receives signal, JD utilizes the correlation of disturbing with the signal that receives usually.At " Zero Forcing and Minimum Mean-Square-ErrorEqualisation for Multi User Detection in Code-Division-Multiple-AccessChannels ", Anja Klein, Ghassan Kawan Kaleh and Paul Walter Baier, IEEE transactions on vehicular technology, volume 45, number 2, can find the mathematical description of different JD technology used among the TDD-CDMA among the May1996.At " Comparative Study of Joint-Detection Techniques for TD-CDMA basedMobile Radio Systems ", Marius Vollmer, Martin Haardtand J ü rgen
, IEEE journal on selected areas in communications, volume 19, and number 8, can find among the August 2001 other research of JD technology.
Wherein, the structure of signal matrix described in these articles, and it has typical piece Toeplitz structure, the use of Cholesky decomposition method and the structure of covariance matrix.Some other statistic algorithms and technology have also been described, for example least mean-square error piece linear equalization (MMSE-BLE) here.
Except that the signal that receives, the JD algorithm also needs the knowledge relevant with CIR with the quadrature spread code so that processing signals.The knowledge relevant with CIR is provided by independent channel estimator.The midamble of the common analytic signal of this channel estimator is to determine CIR, and the midamble of signal comprises the midamble code.
In the JD algorithm, the information relevant with spreading code and CIR is used to constitute convolution matrix.This convolution matrix has formed the basis of several processes in the algorithm, the structure of covariance matrix is arranged in these processes and it is carried out the Cholesky decomposition.Particularly this latter two steps has formed the bottleneck of used JD algorithm in the prior art.
If M is the quantity of data symbol in the data field of each spreading code, N is the quantity of used spreading code in the algorithm, and then covariance matrix comprises (N*M)
2Individual element.In the covariance matrix this (N*M)
2The calculating of individual element and the Cholesky decomposition step that this covariance matrix is carried out, the instruction cycle sum used to the time slot of each decomposition in the TDD-CDMA system proposed huge demand.These two steps can be regarded as the performance bottleneck in the signal processing.
The JD receiver is handled the corresponding signal of all possible spreading code in each time slot with the TDD-CDMA system in the prior art.If a system can handle Nmax spreading code simultaneously, and reality has been used N code in the particular moment system, and then the JD algorithm decomposes the signal corresponding with all codes, supposes N=Nmax.
In the prior art, the ISI span of further supposing each signal is the maximum span that the midamble structure is allowed.Thereby be the maximum CIR that produces of channel estimator and based on the midamble structure that presets by the used CIR of JD algorithm.The element number M of a certain particular code produces M=Mmax by used CIR decision in TDD-CDMA signal.
Above-mentioned two hypothesis of being done in the prior art have caused (Nmax*Mmax) in the covariance matrix
2The standard of individual element (maximum) scale.
Although JD has developed the several years, the complexity of JD remains a challenge to the designer in TDD-cdma system.The maximum rate that mobile device can be received and sent messages will be subject to the performance of JD algorithm.
Summary of the invention
The objective of the invention is provides a kind of signal processing method and equipment of best performance for the mobile communication system with TDD-CDMA operation.
Purpose of the present invention especially provides a kind of real-time signal-processing method and equipment that has reduced complexity.
Realize these and more purposes of the present invention according to of the present invention based on a kind of signal processing method in the telecommunication system of time division duplex (TDD)-Code Division Multiple Access (CDMA).
According to a preferred embodiment of the present invention, in the JD algorithm, whether idle receiver (or addressed location) by determining the signal corresponding with spreading code when reception (it be not used in the sub-district) and ignoring the element that may comprise relevant information with the corresponding spreading code evaluation of idle signal.Greatly reduce computation complexity during the JD by the amount that reduces sequence spreading to be processed.
According to another embodiment of the present invention,, can decision signal be idle just if the signal power corresponding with each spreading code is lower than a certain threshold level.For example, this task can be finished when each combined channel estimator by receiver carries out channel estimating.
Can make according to its threshold value of judging the signal free time and depend on the particular case that will use receiver.People can regard required precision and available disposal ability as the example of these correlations.
A kind of method of reseptance is provided in another embodiment of the present invention, and wherein the evaluation to the element that may comprise relevant information comprises the step of minimizing to each signal number of elements to be processed that receives.In order to realize this point, people it is contemplated that receiver is determined and the actual CIR of use channel.
Can comprise some bats of sufficiently high CIR energy percentage and from channel estimating, determine the length of CIR by utilization.Reduce to threshold value when following when the percentage of CIR energy, just stop to measure and definite CIR.
Moreover, the threshold value of CIR energy percentage is depended on determine to use the parameter of the particular case of receiver therein, for example required precision and available disposal ability.
The invention still further relates to a kind of equipment that is used for signal processing that comprises the device of carrying out disclosed method, and the radio access unit that comprises this equipment.
Except above-mentioned, the invention still further relates to by layout and be used to evaluate the radio access unit that the device of the element that may comprise relevant information is formed.
In one aspect of the invention, provide a kind of and in time division duplex Code Division Multiple Access (TDD-CDMA) telecommunication system, carried out method for processing signals, wherein a plurality of users send signal to radio access unit simultaneously at least one channel, in the described signal each all comprises unique sequence spreading, and described signal is received by described addressed location and utilizes signal processing algorithm to handle simultaneously, described signal processing algorithm comprises the step of utilizing sequence spreading and channel impulse structure convolution matrix, wherein by reducing the quantity of element in the described convolution matrix, by the element that may comprise relevant information being evaluated and being utilized the described element that may comprise relevant information to construct the complexity that described convolution matrix reduces described signal processing algorithm, described evaluation comprises identification and the corresponding sequence spreading of idle signal and removes step with the corresponding sequence spreading of idle signal, it is characterized in that, described evaluation also is included as each signal and determines actual channel impulse response, is used for reducing the quantity at described signal processing algorithm element to be processed.
Preferably, in described method, described evaluation comprises signal energy is relied on the step that parameter and threshold value compare.
Preferably, in described method, bring in constant renewal in described threshold value according to the system parameters of dynamic change.
Preferably, in described method, described system parameters comprises that available disposal ability requires and/or the performance quality requirement.
Preferably, in described method, determine described actual channel impulse response by several sample count are carried out for each signal, it is measured that wherein said signal energy relies on parameter, and described parameter has exceeded described threshold value.
Preferably, in described method, described signal energy relies on parameter and comprises that one group comprises the energy percentage relevant with described actual channel impulse response and at least one in the signal power.
Preferably, in described method, the evaluation of the element that may comprise relevant information is comprised the step of calculating corresponding to the signal power of described sequence spreading.
Preferably, in described method, described actual channel impulse response be with during comprised greater than the time interval of the described signal power of predefine threshold value and having determined.
Preferably, in described method, if corresponding to the described signal power of described sequence spreading less than described threshold value, then described sequence spreading just is identified as corresponding to idle signal.
Preferably, in described method, described convolution matrix is used to the tectonic system matrix, described sytem matrix is used to construct covariance matrix, utilize the Cholesky decomposition method to decompose covariance matrix, and the result who wherein implements described Cholesky decomposition method is used in described signal processing algorithm.
In another aspect of the present invention, a kind of equipment that is used for signal processing in time division duplex Code Division Multiple Access (TDD-CDMA) telecommunication system is provided, wherein a plurality of users send signal to radio access unit simultaneously at least one channel, in the described signal each all comprises unique sequence spreading, described equipment comprises and is used to receive the device of described signal and is used to utilize signal processing algorithm to handle the device of described signal simultaneously, the described device that is used for handling simultaneously is arranged for utilizing described sequence spreading and channel impulse structure convolution matrix, the described device that wherein is used for handling simultaneously also is arranged for reducing by the quantity that reduces described convolution matrix element the complexity of described signal processing algorithm, wherein said equipment also comprises the device that is used to evaluate the element that may comprise relevant information, and the described device that wherein is used for handling simultaneously is arranged for utilizing the described element that may comprise relevant information to construct described convolution matrix, the described device that wherein is used to evaluate is arranged for discerning the sequence spreading corresponding with idle signal and removes the sequence spreading corresponding with idle signal, it is characterized in that, the described device that is used to evaluate also is arranged for determining actual channel impulse response for each signal, to be used for reducing the quantity at described signal processing algorithm element to be processed.
Preferably, in described equipment, the described device that is used to evaluate is arranged for signal energy dependence parameter and threshold value are compared.
Preferably, described equipment also comprises the device of bringing in constant renewal in described threshold value according to the system parameters of dynamic change.
Preferably, in described equipment, described system parameters comprises that available disposal ability requires and/or the performance quality requirement.
Preferably, in described equipment, the described device that is used to evaluate is arranged for by several sample count are determined described actual channel impulse response, and the signal energy of wherein said measurement relies on parameter and exceeded threshold value.
Preferably, in described equipment, described signal energy relies on parameter and comprises that one group comprises the energy percentage relevant with described actual channel impulse response and at least one in the signal power.
Preferably, in described equipment, the described device that is used to evaluate is arranged for calculating the signal power corresponding to described sequence spreading.
Preferably, in described equipment, the described device that is used to evaluate is arranged for by having comprised the definite described actual channel impulse response of the time interval greater than the received signal power of predefine threshold value during determining.
Preferably, in described equipment, the described device that is used to evaluate is arranged for by determining whether to discern sequence spreading corresponding to idle signal less than described threshold value corresponding to the described signal power of described sequence spreading.
Preferably, in described equipment, the described device that is used for handling simultaneously also is arranged to utilize described convolution matrix tectonic system matrix, be used for from described sytem matrix structure covariance matrix, be used to the result that utilizes the Cholesky decomposition method to decompose described covariance matrix and be used for implementing the utilization of described signal processing algorithm described Cholesky decomposition method.
Of the present invention aspect another, a kind of radio access unit of using in time division duplex Code Division Multiple Access (TDD-CDMA) telecommunication system is provided, comprise: signal processing apparatus, described signal processing apparatus comprises the device that is used for decomposing according to the unique sequence spreading that is included in each signal a plurality of signals, and described signal processing apparatus also comprises and is used to evaluate the device of the element that may comprise relevant information and is used to utilize the described device that may comprise the described element structure convolution matrix of relevant information, the described device that wherein is used to evaluate is arranged for discerning the sequence spreading corresponding with idle signal and is used to remove the sequence spreading corresponding with idle signal, it is characterized in that the described device that is used for evaluating also is arranged for determining that for each signal actual channel impulse response is to be used to reduce the quantity at described signal processing algorithm element to be processed.With reference to the accompanying drawings, below to explanation above-mentioned and further feature and advantage of the present invention in the description of the preferred embodiments of the present invention.
Description of drawings
Fig. 1 shows the typical structure of the signal data group of the mobile device of operating in TDD-CDMA telecommunication system.
Fig. 2 shows in TDD-CDMA telecommunication system the structure of composite signal that sends a plurality of mobile devices of signal to a radio access unit.
Fig. 3 is that this operation can be included in according in the method for the present invention to the explanation of receiver operation.
Fig. 4 shows according to method and apparatus of the present invention.
Embodiment
The typical structure that is sent to the data set 1 of radio access unit in time division duplex (TDD)-Code Division Multiple Access (CDMA) telecommunication system by mobile device has been shown among Fig. 1.Data set 1 finished with the protection period 2, to delimit the boundary of data set 1 and other data set.At the protection period of last data group (not shown) with between the protection period 2, data block 3 and 4 is sent to radio access unit.The data block 3 and 4 that comprises data sequence is separated by midamble 5, and midamble 5 comprises a midamble code.Information about the used spreading code of signal is transmitted by the midamble code.
Can with a matrix structure represent among the TDD-CDMA whole signals of receiving from many groups radio mobile device (not shown) of the coverage of this radio access unit, working by a radio access unit or and signal, schematically show this matrix structure among Fig. 2.Here represented data set 6 (as shown in Figure 2), an every expression different data set (for example piece 6) in the matrix.Piece 7 on the same group is not illustrated in the signal that sends in the different frequency bands, by the upper left abbreviation of figure " freq. " indication.
In single frequency band, sent to radio system simultaneously from a plurality of signals of for example one group of user of 8 and 9.All signals 8 belong to the unique user group, are that the user organizes I in this example, and signal 8 comprises N signal, and each signal is all by different spreading code coding, as scheme shown in the abbreviation " code " at middle part, a left side.Immediately following organizing the signal of II the user shown in 9 freely of coming who organizes the signal that sends among the I as the user as shown in 8, this is a N signal in addition in time.Then will receive from the user and organize the signal that III, user organize IV or the like by radio system.Because these signals are duplexing (clearly not illustrating among Fig. 2), radio access unit will be beamed back signal to mobile device, and the signal of being beamed back also can be placed with piece as shown in Figure 2.
Fig. 3 shows the operation of acceptor unit in TDD-cdma system, and it can be included in according in the equipment of the present invention.Receive corresponding with a characteristic frequency shown in first row 8 among Fig. 2 and signal 33 by receiver (as shown in Figure 4, receiver 12).Receiver separates 34 to midamble piece 35 and data block 36.To use during the course subsequently with the part of expression data block 36 in the signal, and be forwarded 38 to parts of the system that carries out signal processing.To be forwarded 37 to channel estimators (as shown in Figure 4) with the part of expression midamble 35 in the signal.35 and 36 parts of signal can be regarded as the stack of the overlapping individual signals part of representing data block and midamble respectively.
Fig. 4 shows schematically showing according to method and apparatus of the present invention.Here, a plurality of signals 10 of N are sent out 11 to radio access unit 12.Radio access unit 12 receive and signal 10 and the stack of the stack of midamble 14 and data block 13 from signal 10 separates (as shown in Figure 3), attention do not have at this moment about be present in signal 10 in the knowledge of single midamble.The stack of data block 13 will be used in the signal processing, will discuss below, and the stack of midamble 14 is forwarded to channel estimator 16.
Based on built-in systematic knowledge, the structure of the midamble of channel estimator from the stack that receives is determined (length) CIR 17 of maximum possible, and it is forwarded to CIR analyzer 18.In CIR analyzer 18, signal power and threshold value 15 are compared, from this contrast, determine (weak point) CIR estimation 19 and the spreading code 20 corresponding that strengthen with idle signal.
Between the above-mentioned comparable period, compare to the signal power of all spreading codes mensuration midamble and with itself and threshold value 15.If the signal power corresponding with certain particular extension code is lower than threshold value 15, this signal just is counted as idle signal and this spreading code is also sorted out like this.If signal power is higher than threshold value 15, just claps continuously signal power is sampled at each cycle or every bat or several.When signal power is reduced to threshold value when following in certain specific bat, just be counted as actual CIR up to the umber of beats of this last sampling to this spreading code correspondence from first sampling.This comparison procedure does not clearly illustrate in Fig. 3.
Preferably, threshold value 15 is brought in constant renewal in disposal ability that the parameter of institute's foundation is for example available and performance quality requirement according to the system parameters of dynamic change.
But, replace or except the signal power that mensuration receives, can be by the validity of using the signal that indication receives according to method and apparatus of the present invention or other signal parameter of correlation.Relative signal energy dependent parameter for example, the i.e. percentage of the total signal energy that receives by radio access unit.For example, can determine this relative signal energy parameter from a plurality of bats or the counting of time cycle of the signal that receives that its energy level is higher than lowest threshold.
In selector 22, from the tabulation 21 of all available spreading codes, remove the spreading code 20 corresponding with idle signal, only stay movable spreading code 23.Therefore, selector is also removed the information (because they do not comprise effectively or correlation) of the CIR corresponding with idle signal, only stays movable CIR 24.
The parts 25 of the convolution matrix of the CIR of spreading code that movable spreading code 23 and CIR 24 are forwarded to the generation activity and activity.Because only used movable spreading code and actual CIR, need the quantity of the signal element of processing just to reduce.Since with to use the situation of all known extensions codes to compare computation complexity in conjunction with the upper limit of CIR to have reduced, thereby the performance of this calculating also is improved.
In the further embodiment of the present invention, input signal 13 is to handle for example so-called joint-detection (JD) algorithm with the appropriate signal Processing Algorithm.The JD algorithm comprises the step according to sytem matrix structure covariance matrix, and the step of handling covariance matrix with the Cholesky decomposition method.
Should be appreciated that to the present invention numerous changes and variation can be arranged according to above-mentioned instruction.Therefore, should be appreciated that within the scope of the appended claims, can not according to here clearly describe implement the present invention.
Claims (21)
1. one kind is carried out method for processing signals in time division duplex Code Division Multiple Access (TDD-CDMA) telecommunication system, wherein a plurality of users send signal to radio access unit simultaneously at least one channel, in the described signal each all comprises unique sequence spreading, and described signal is received by described radio access unit and utilizes signal processing algorithm to handle simultaneously, described signal processing algorithm comprises the step of utilizing unique sequence spreading and channel impulse structure convolution matrix, wherein by reducing the quantity of element in the described convolution matrix, by the element that may comprise relevant information being evaluated and being utilized the described element that may comprise relevant information to construct the complexity that described convolution matrix reduces described signal processing algorithm, described evaluation comprises identification and the corresponding sequence spreading of idle signal and removes step with the corresponding sequence spreading of idle signal, it is characterized in that, described evaluation also is included as each signal and determines actual channel impulse response, is used for reducing the quantity at described signal processing algorithm element to be processed.
2. according to the process of claim 1 wherein that described evaluation comprises signal energy is relied on the step that parameter and threshold value compare.
3. according to the method for claim 2, wherein bring in constant renewal in described threshold value according to the system parameters of dynamic change.
4. according to the method for claim 3, wherein said system parameters comprises that available disposal ability requires and performance quality in requiring any one or the two.
5. according to any method in claim 2 or 3, wherein determine that for each signal described actual channel impulse response is by carrying out several sample count, it is measured that wherein said signal energy relies on parameter, and described signal energy dependence parameter has exceeded described threshold value.
6. according to any method among the claim 2-4, wherein said signal energy relies on parameter and comprises in the group that comprises energy percentage and signal power at least one, and wherein said energy is relevant with described actual channel impulse response.
7. according to any method among the claim 1-4, wherein the evaluation to the element that may comprise relevant information comprises the step of calculating corresponding to the signal power of described unique sequence spreading.
8. according to the method for claim 7, wherein said actual channel impulse response be with during comprised greater than the time interval of the described signal power of predefine threshold value and having determined.
9. according to the method for claim 6, if wherein corresponding to the described signal power of described unique sequence spreading less than described threshold value, then described unique sequence spreading just is identified as corresponding to idle signal.
10. according to any method among the claim 1-4, wherein said convolution matrix is used to the tectonic system matrix, described sytem matrix is used to construct covariance matrix, utilize the Cholesky decomposition method to decompose covariance matrix, and the result who wherein implements described Cholesky decomposition method is used in described signal processing algorithm.
11. equipment that in time division duplex Code Division Multiple Access (TDD-CDMA) telecommunication system, is used for signal processing, wherein a plurality of users send signal to radio access unit simultaneously at least one channel, in the described signal each all comprises unique sequence spreading, described equipment comprises and is used to receive the device of described signal and is used to utilize signal processing algorithm to handle the device of described signal simultaneously, the described device that is used for handling simultaneously is arranged for utilizing described unique sequence spreading and channel impulse structure convolution matrix, the described device that wherein is used for handling simultaneously also is arranged for reducing by the quantity that reduces described convolution matrix element the complexity of described signal processing algorithm, wherein said equipment also comprises the device that is used to evaluate the element that may comprise relevant information, and the described device that wherein is used for handling simultaneously is arranged for utilizing the described element that may comprise relevant information to construct described convolution matrix, the described device that wherein is used to evaluate the element that may comprise relevant information is arranged for discerning the sequence spreading corresponding with idle signal and removes the sequence spreading corresponding with idle signal, it is characterized in that, the described device that is used to evaluate the element that may comprise relevant information also is arranged for determining actual channel impulse response for each signal, to be used for reducing the quantity at described signal processing algorithm element to be processed.
12. according to the equipment of claim 11, the described device that wherein is used to evaluate the element that may comprise relevant information is arranged for signal energy dependence parameter and threshold value are compared.
13., also comprise the device of bringing in constant renewal in described threshold value according to the system parameters of dynamic change according to the equipment of claim 12.
14. according to the equipment of claim 13, wherein said system parameters comprises that available disposal ability requires and performance quality in requiring any one or the two.
15. according to any equipment in claim 12 or 13, the described device that wherein is used to evaluate the element that may comprise relevant information is arranged for by several sample count are determined described actual channel impulse response, and wherein said signal energy relies on the measured and described signal energy of parameter and relies on parameter and exceeded threshold value.
16. according to any equipment among the claim 12-14, wherein said signal energy relies on parameter and comprises in the group that comprises energy percentage and signal power at least one, wherein said energy is relevant with described actual channel impulse response.
17. according to any equipment among the claim 11-14, the described device that wherein is used to evaluate the element that may comprise relevant information is arranged for calculating the signal power corresponding to described unique sequence spreading.
18. according to the equipment of claim 17, the described device that wherein is used to evaluate the element that may comprise relevant information is arranged for by having comprised the definite described actual channel impulse response of the time interval greater than the received signal power of predefine threshold value during determining.
19. according to the equipment of claim 16, the described device that wherein is used to evaluate the element that may comprise relevant information is arranged for by determining whether to discern sequence spreading corresponding to idle signal less than described threshold value corresponding to the described signal power of described unique sequence spreading.
20. according to any equipment among the claim 11-14, the described device that wherein is used for handling simultaneously also is arranged to utilize described convolution matrix tectonic system matrix, be used for from described sytem matrix structure covariance matrix, be used to the result that utilizes the Cholesky decomposition method to decompose described covariance matrix and be used for implementing the utilization of described signal processing algorithm described Cholesky decomposition method.
21. radio access unit of in time division duplex Code Division Multiple Access (TDD-CDMA) telecommunication system, using, comprise: signal processing apparatus, described signal processing apparatus comprises the device that is used for decomposing according to the unique sequence spreading that is included in each signal a plurality of signals, and described signal processing apparatus also comprises and is used to evaluate the device of the element that may comprise relevant information and is used to utilize the described device that may comprise the described element structure convolution matrix of relevant information, the wherein said device that is used to evaluate is arranged for discerning the sequence spreading corresponding with idle signal and is used to remove the sequence spreading corresponding with idle signal, it is characterized in that the described device that is used for evaluating also is arranged for determining that for each signal actual channel impulse response is to be used to reduce the quantity at described signal processing algorithm element to be processed.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/EP2002/005058 WO2003094378A1 (en) | 2002-05-06 | 2002-05-06 | A method of and an arrangement for reduced real-time signal processing in a tdd-cdma telecommunications system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1625846A CN1625846A (en) | 2005-06-08 |
| CN100508413C true CN100508413C (en) | 2009-07-01 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB028289226A Expired - Fee Related CN100508413C (en) | 2002-05-06 | 2002-05-06 | Method and equipment for reduced real-time signal processing in TDD-CDMA telecommunications system |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN100508413C (en) |
| AU (1) | AU2002316897A1 (en) |
| WO (1) | WO2003094378A1 (en) |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FI109735B (en) * | 1997-02-28 | 2002-09-30 | Nokia Corp | Reception procedure and recipients |
| JP2000261412A (en) * | 1999-03-06 | 2000-09-22 | Matsushita Electric Ind Co Ltd | Interference signal eliminating device |
| JP3522678B2 (en) * | 2000-09-27 | 2004-04-26 | 松下電器産業株式会社 | Communication terminal device and demodulation method |
-
2002
- 2002-05-06 AU AU2002316897A patent/AU2002316897A1/en not_active Abandoned
- 2002-05-06 CN CNB028289226A patent/CN100508413C/en not_active Expired - Fee Related
- 2002-05-06 WO PCT/EP2002/005058 patent/WO2003094378A1/en not_active Application Discontinuation
Non-Patent Citations (5)
| Title |
|---|
| COMPARATIVE STUDY OF JOINT-DETECTIONTECHNIQUES FOR TD-CDMA BASED MOBILE RADIOSYSTEMS. VOLLMER M ET AL.IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS ,IEEE INC. NEW YORK,US,Vol.19 No.8. 2001 |
| COMPARATIVE STUDY OF JOINT-DETECTIONTECHNIQUES FOR TD-CDMA BASED MOBILE RADIOSYSTEMS. VOLLMER M ET AL.IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS ,IEEE INC. NEW YORK,US,Vol.19 No.8. 2001 * |
| ZERO FORCING AND MINIMUM MEAN-SQUARE ERROREQUALIZATION FOR MULTIUSER DETECTION IN CODEDIVISION MULTIPLE-ACCESS CHANNELS. KLEIN A ET AL.IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY ,IEEE INC. NEW YORK ,US,Vol.45 No.2. 1996 |
| 联合检测技术在第三代移动通信中的应用. 黄华生，蒋泽.无线通信技术，第1期. 2002 |
| 联合检测技术在第三代移动通信中的应用. 黄华生，蒋泽.无线通信技术，第1期. 2002 * |
Also Published As
| Publication number | Publication date |
|---|---|
| AU2002316897A1 (en) | 2003-11-17 |
| WO2003094378A1 (en) | 2003-11-13 |
| CN1625846A (en) | 2005-06-08 |
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