CN1756096A - Signal detector - Google Patents

Abstract

The invention provides a signal detector, and in the circumstances that a receiving side wireless station has a plurality of signals to overlap to exist on the same frequency, the signal detector can separate and detect signals by lesser calculation amount, and improve the frequency usage efficiency. The signal detector is provided with a band-pass filter with a changeable through frequency band, a signal parameter detecting element, a sequence detecting determination element, a parameter control element, an equilibrium judgement element and a duplication generation element, wherein, the band-pass filter carries out the limitation of the frequency band for received signals and can change the through frequency band, and the signal parameter detecting element detects the signal parameters of the multiple signals contained in the received signals; the sequence detecting determination element determines the detecting sequence of the received signals according to the received signals and the signal parameters; and the parameter control element controls the through frequency band of the band-pass filter with the changeable through frequency band according to the detecting sequence and the signal parameters, and the equilibrium control element carries out the equilibrium and the judgment for output signals coming from the band-pass filter with a changeable through frequency band; the duplication generation element uses judgment results of the equilibrium control element and transmission path estimated values estimated in the equilibrium treatment to generate the duplication of the received signals.

Description

Signal detector

Technical field

The present invention relates to the signal detector that a kind of wireless receiver that constitutes wireless communication system uses.

Background technology

In wireless communication system, in order effectively to use limited frequency resource, the technology of the interference volume that inhibition receives is extremely important.As the prior art that improves frequency utilization efficient, the copy generation type interference eliminator (for example, with reference to non-patent literature 1) of the copy of generation received signal shown in Figure 1 with effective removal interference arranged.

Copy generation type interference eliminator shown in Figure 1, use evaluated error and contrast signal to estimate to wish the channel of signal and interference signal one by one by channel estimation unit a, in wishing signal copy maker b and interference signal copy maker c, to wishing that all sequence of symhols candidates that signal and interference signal may obtain and separately channel estimation value carry out convolution algorithm, thus to all sequence of symhols candidates generate wish signal copy and interference signal copy and as they and the received signal copy, can provide and the hope signal of the immediate received signal copy of actual reception signal and the sequence of symhols candidate of interference signal in the d of maximum-likelihood sequence estimation portion judgement, the sequence of symhols candidate that wishes signal is exported as the result of determination of received signal, disturb thereby effectively remove.Wherein, contrast signal uses known sequence of symhols between training center, the code element after data interval uses judgement.

Like this, by suitably removing interference signal from received signal, different a plurality of signals can use same frequency at synchronization, can improve frequency utilization efficient.

On the other hand, as other prior art that improves frequency utilization efficient, studying shown in Figure 2 based on MMSE (Minimum MeanSquare Error: the method for Multiuser Detection one by one (non-patent literature 3) of filter least mean-square error) at a plurality of subscriber signals with same signal bandwidth.

Shown in Figure 2 based on Multiuser Detection method at the MMSE filter of a plurality of subscriber signals with same signal bandwidth, at first, set about the 1st detection signal (below, k signal that detects called k detected object signal), by the MMSE filter, the channel information of all detected object signals of preservation is pre-estimated in utilization, and this first detected object signal is carried out equilibrium treatment.Then, according to the signal after this equilibrium, the copy that carries out the input and the first detected object signal generates.Then, set about the second detected object signal, carry out equilibrium, detection and copy and generate processing.At this moment, use the signal that deducts after the copy signal of the first detected object signal from input signal to handle.Thus, the second detected object signal can carry out input under the state that has suppressed from the interference of the first detected object signal handles, and can obtain the testing result of high reliability.Also identical based on the Multiuser Detection method of MMSE filter with the method for Multiuser Detection one by one based on frequency band limits, in k detected object signal, signal after use deducts from the first detected object signal to the copy signal of k-1 detected object signal from input signal carries out input and handles.

Like this, detect other signal that becomes the interference source of detected object signal one by one, ghost is removed, thereby a plurality of unlike signal can use same frequency at synchronization, can improve frequency utilization efficient.

Non-patent literature 1 " Den send speed Iso な Ru letter branch From to remove the method motion ", Electricity feelings Reported communication association Gross closes conference and gives the original text collection, B-5-174, (in March, 2004)

Non-patent literature 3 ' An efficient square-root algorithm forBLAST, ' International conference on Acoustics, Speech, and SignalProcessing (ICASSP) ' 00, (in June, 2000)

Non-patent literature 4 ' Fractional Tap-Spacing Equalizer andConsequences for Clock Recovery in Data Modems, ' IEEE Transactionon Communications, (in August, 1976)

Copy generation type interference eliminator shown in Figure 1, though can generate the copy and the detection signal of the signal that comprises in the received signal,, when using number of signals to increase, amount of calculation is exponential increase, has the problem that is difficult to finish processing in the computing time of reality.When particularly overlapping a plurality of narrow-band signals send on the frequency identical with broadband signal,, must handle a plurality of narrow-band signals simultaneously, so be difficult to separate and detection signal in order to separate and to take out broadband signal.

In addition, shown in Figure 2 based on Multiuser Detection method to the MMSE filter of a plurality of subscriber signals with same signal bandwidth, in the MMSE filter, because use the channel information of interference signal to carry out the equilibrium of signal, so can keep higher signal accuracy of detection and copy to generate precision.At this moment, general described channel information uses in the estimated value of receiver side.Yet, when the different signal overlap of signal bandwidth in received signal is on same frequency, because use to come each signal is carried out frequency band limits by the frequency band filter different (not shown) with transmitter side, so the signal after the sampling is subjected to intersymbol interference (Inter-Symbol Interference, influence ISI).About this ISI, because the signal bandwidth at the frequency band limits filter of the transmitter side of the detected object signal that comprises in the received signal self and the frequency band limits filter of receiver side is identical, so in not having the environment that postpones ripple, can not produce ISI by using the frequency band limits filter that adopts up to now to make.But, signal for signal bandwidth other users different with the detected object signal, because the receiver side frequency band limits filter of using by the detected object signal carries out frequency band limits to received signal, so the frequency band limits filter of transmitter side is different with the signal bandwidth of the frequency band limits filter of receiver side, causes producing ISI.This ISI is according to regularly and significantly change of sampling, and the state of channel is also according to regularly and significantly change of each sampling.Though can estimate this change by the channel estimating of using fractional spaced type coefficient variable filter (non-patent literature 4), the tap of filter (tap) quantity becomes extremely many, and amount of calculation increases, and the precision of channel estimation deterioration.

Summary of the invention

The present invention proposes in order to solve above-mentioned existing issue, its purpose is, a kind of signal detector is provided, and this signal detector is under a plurality of signal overlaps are present in condition on the same frequency, can separate and detection signal with less amount of calculation, can improve frequency utilization efficient.

In order to address the above problem, one of the present invention's signal detector, it is the signal detector in the wireless communication system, in this wireless communication system, there be signal bandwidth a plurality of transmitter sides wireless station and a plurality of receiver side wireless station different that sends signal with carrier frequency, communicate from the wireless station of described transmitter side to sending wireless signal as the wireless station of the described receiver side of communication counterpart, described signal detector is arranged in the wireless office of described receiver side, it is characterized in that, have: pass through variable passband bandpass filter, it carries out frequency band limits to received signal, can make by frequency band variable; The signal parameter detection unit, it detects the signal parameter of a plurality of signals that comprise in the described received signal; Detection determines the unit in proper order, the detection order of its signal parameter that is detected according to described received signal with by described signal parameter detection unit decision received signal; Parameter control unit, it controls the described frequency band that passes through by variable passband bandpass filter according to detection order that determines the unit decision by described detection in proper order and the signal parameter that is detected in described signal parameter detection unit; Balanced identifying unit, it is to carrying out equilibrium and judgement from described output signal by variable passband bandpass filter; The copy generation unit, it uses the result of determination of described balanced identifying unit and estimated channel estimated value in equilibrium treatment, generate the copy of described received signal, utilize the difference of the signal parameter of a plurality of signals that comprise in the described received signal, according to the detection order, sequentially from described received signal, separate with balanced identifying unit and take out described a plurality of signal by variable passband bandpass filter by described.By taking this structure, under the situation of various signal common frequency bands, can separate and take out the signal that comprises in the received signal in the receiver side processing less with amount of calculation.

And, the present invention's two is the signal detectors one of according to the present invention, described detection determines that in proper order the unit has: mutual interference volume estimation unit, and it is according to described received signal and described signal parameter, the mutual interference volume during a plurality of signal phase mutual interference estimating to comprise in the described received signal; Quality is estimated and order determines the unit, it uses the mutual interference volume of estimation estimated in described mutual interference volume estimation unit, the order that decision separates and takes out the signal that comprises the described received signal from described received signal, described quality is estimated and order determines the unit to be made as the quality of the benchmark of setting when calculating signal as the detection order of decision regulation to get off to the signal that detects front in the detection of the described regulation order to the mutual interference volume of the estimation of other signal, and decision in proper order.Like this, can begin sequence detection from the high signal of quality.

And the present invention's three is signal detectors of two according to the present invention, and described mutual interference volume estimation unit has: the signal power estimation unit, and it estimates the received power of a plurality of signals of comprising in the described received signal; Per unit bandwidth power computing unit, it calculates the power of a plurality of signals per unit bandwidth separately that comprises in the described received signal according to described signal parameter and a plurality of signals power estimated value separately of comprising in the estimated described received signal in described signal power estimation unit; Signal overlap state estimation unit, it is according to described signal parameter, estimates the bandwidth of a plurality of signals of comprising in described received signal frequency of overlapping and phase mutual interference on frequency; The interference power computing unit, it is according to the signal power calculated value of a plurality of signals per unit bandwidth separately of calculating at described per unit bandwidth power computing unit, comprise in the described received signal, and the overlapping frequency bandwidth between a plurality of signals that comprise in estimated in described signal overlap state estimation unit, the described received signal, calculate and estimate mutual interference volume.Thus, the mutual interference volume of a plurality of signals that easily comprises in the estimating received signal.

And, the present invention's four is signal detectors of three according to the present invention, described mutual interference volume estimation unit has the transmission path estimation unit, this transmission path estimation unit uses described received signal and described signal parameter, the state of estimating the transmission path that a plurality of signals of comprising in the described received signal broaden along time shaft is a transmission path estimation value, and described signal power estimation unit can use the transmission path estimation value of estimated main ripple at each signal in described path estimation unit to come estimating power.Thus, can estimate the power of each signal accurately.

And, the present invention's five is signal detectors of three according to the present invention, described signal power estimation unit can use respectively the known sequence of symhols corresponding with a plurality of signals of comprising in the described received signal to carry out coherent detection, thereby estimates the power of each signal.Thus, can utilize simple structure to estimate the power of each signal.

And, the present invention's six is signal detectors of three according to the present invention, value after described per unit bandwidth power computing unit can utilize the signal bandwidth that comprises in the signal parameter of each signal to the signal power of each signal of having been estimated the stipulated time by described signal power estimation unit averages, thereby calculates the signal power of the per unit bandwidth of each signal.Thus, can estimate the interference volume of each signal to the per unit bandwidth of other signal generation.

And, the present invention's seven is signal detectors of three according to the present invention, described signal overlap state estimation unit can be according to center frequency information that comprises in the described signal parameter and signal bandwidth information, calculate the upper and lower bound of the service band of each signal, the higher limit and the lower limit of the frequency band that is relatively calculated between all signals that comprise in described received signal are calculated the described overlapping band width between each signal.Thus, can obtain the mutual interference signals frequency band of each signal by simple calculating.

And, the present invention's eight is signal detectors of three according to the present invention, the interference power computing unit can multiply each other by the overlapping frequency bandwidth between each signal of obtaining to the signal power of the per unit bandwidth of each signal of being obtained by described per unit bandwidth power computing unit with by described signal overlap state estimation unit, calculates the interference power between a plurality of signals that comprise in the described received signal.Thus, can be by the simple interference power of estimating between each signal of calculating.

And, the present invention's nine be one of according to the present invention～three in each signal detector, described detection determines that in proper order the unit has: mutual interference volume estimation unit, it is according to described received signal and described signal parameter, estimates a plurality of signals of comprising in the described received signal mutual interference volume during overlapping and phase mutual interference on frequency axis; Noise estimation unit, it is according to described received signal and described signal parameter, the noise power that a plurality of signal of estimating respectively to comprise in the described received signal is accepted; Quality is estimated and order determines the unit, it uses the mutual interference volume of estimation estimated in described mutual interference volume estimation unit and estimated estimating noise power in described noise estimation unit, the order that decision separates and takes out the signal that comprises in the described received signal from described received signal, described quality is estimated and order determines the unit to be made as the signal that detects front in the detection of the described regulation order below the setting to the mutual interference volume of the estimation of other signal, the quality of the benchmark when calculating the signal as the detection order of decision regulation, thereby decision order.Like this, can use the communication quality of having considered the noise that comprises in the received signal to detect the decision of order, can separate accurately and detection signal.

And the present invention's ten is signal detectors of nine according to the present invention, and described noise estimation unit has: the copy signal generation unit, and it generates the copy of received signal according to described received signal and described signal parameter; Subtracter, it deducts the copy signal that is generated by described copy signal generation unit from described received signal, the output residual signal; Band pass filter, it utilizes a plurality of signals signal bandwidth separately that comprises in the described received signal that described residual signal is carried out frequency band limits; The noise power estimation unit, it calculates the power that has carried out the noise of frequency band limits by described band pass filter, by go forward side by side line frequency band restriction of the noise signal waveforms that comprises in the estimating received signal, can obtain and export the power that makes the affected noise of a plurality of signals that comprises in the received signal at each signal.Thus, can easily obtain the power of the noise that influences each signal that comprises in the received signal.

And, the present invention's 11 be one of according to the present invention～ten in each signal detector, described detection determines the detection of the signal that the unit can be high more with communication quality to set highly more in proper order in proper order.Thus, can reduce detection and be the decision error in the upper signal in proper order, can separate accurately and detection signal.

And, the present invention's 12 be one of according to the present invention～11 in each signal detector, has the described level of exporting the copy signal of each signal that comprises in the received signal by variable passband bandpass filter and described balanced identifying unit and described copy generation unit of a plurality of uses, in the level of regulation, deduct the copy signal that generates in prime from received signal, use this result to carry out frequency band limits and balanced judgement.Like this, carry out equilibrium treatment repeatedly, can obtain high-precision transmission path estimation value, can separate accurately and detect each signal that comprises in the received signal by using a plurality of level.

And, the present invention's 13 be one of according to the present invention～12 in each signal detector, the signal parameter of each signal that comprises in the received signal can be estimated and detect in described signal parameter detection unit according to received signal.Thus, can under the state of not relevant information, carry out Signal Separation in advance with each signal.

And, the present invention's 14 be one of according to the present invention～13 in each signal detector, the signal parameter of each signal is notified at the wireless station that described signal parameter detection unit can be sent out side in advance.Like this, by obtaining the signal parameter of each signal in advance, can easily carry out the Signal Separation action.

And, the present invention's 15 signal detector, it is the signal detector in the wireless communication system, on the wireless receiver, have the different a plurality of wireless transmitters and a wireless receiver of signal bandwidth that send signal in this wireless communication system with multi-user detector, sending wireless signal from described wireless transmitter to described wireless receiver communicates, described signal detector is set on the described wireless receiver, described multi-user detector has: the frequency band limits filter, its correspondence has nothing in common with each other by frequency band from the transmission signal of described a plurality of wireless transmitters; Channel calculation portion, it uses described signal message, calculates the state considered by the channel of the intersymbol interference of using in described a plurality of wireless transmitters that produces by different filter of frequency band and the filter in the described wireless receiver at each user; The MMSE filter, it uses channel status and the described signal message that calculates in described channel calculation portion, calculating filter coefficient, use estimated copy that is mapped to the sequence of symhols on the signal space in the copy maker carries out equilibrium to the signal that has carried out frequency band limits in the frequency band limits filter; Soft input and output decoder, it uses by the signal after the equilibrium of described MMSE filter, considers that described signal message judges each user's reception data, and calculates the likelihood that is mapped to the code element on the signal space; The copy maker, it is according to the likelihood of the code element of being calculated by described soft input and output decoder, generation be mapped to the signal on the signal space sequence of symhols copy and import described MMSE filter, use the sequence of symhols copy and the described signal message that are generated, generate the received signal copy of the influence of having considered channel; Subtracter, its signal from the input multi-user detector deducts the received signal copy that generates described copy maker.Thus, can consider that equilibrium treatment is carried out in the cataclysm of the ISI that the filter because of the different signal of signal bandwidth causes, accurately separation signal.

And, the present invention's 16 is signal detectors of 15 according to the present invention, described wireless receiver has a plurality of described Multiuser Detection portions of vertical connection and the multistage Multiuser Detection portion that obtains, in described multistage Multiuser Detection portion, described Multiuser Detection portion can use the copy signal that generates in the Multiuser Detection portion of the prime that vertically connects, carry out input and copy and generate.Thus, can improve the precision that copy generates, more accurately separation signal.

According to signal detector of the present invention, under the condition that the same frequency of the different signal common of a plurality of signal parameters communicates, can separate and detection signal with less amount of calculation.

Description of drawings

Fig. 1 is the block diagram of the structure of the existing copy generation type interference eliminator of expression.

Fig. 2 is the block diagram of expression based on the structure of the method for Multiuser Detection one by one (existing method) of MMSE filter.

Fig. 3 is the block diagram of topology example that expression comprises the receiver of the signal detector that the 1st execution mode of the present invention relates to.

Fig. 4 is the schematic diagram of the signal processing of signal detector.

Fig. 5 is the block diagram of topology example that expression comprises the receiver of the signal detector that the 2nd execution mode of the present invention relates to.

Fig. 6 is the block diagram that the expression detection determines the topology example of unit in proper order.

Fig. 7 is the flow chart that the action of unit is estimated and determined in proper order to the quality in the presentation graphs 6.

Fig. 8 is the block diagram that the expression detection determines other topology example of unit in proper order.

Fig. 9 is the flow chart that the action of unit is estimated and determined in proper order to the quality in the presentation graphs 8.

Figure 10 is the block diagram of the topology example of the mutual interference volume estimation unit of expression.

Figure 11 is the block diagram of other topology example of the mutual interference volume estimation unit of expression.

Figure 12 is the block diagram of the topology example of expression per unit bandwidth power computing unit.

Figure 13 is the schematic diagram of the relation of expression power of each signal and per unit bandwidth signal power.

Figure 14 is the schematic diagram of the relation of expression utilized bandwidth of signal and overlapping frequency bandwidth.

Figure 15 is the schematic diagram of the mutual interference volume of expression.

Figure 16 is the block diagram that the expression detection determines other topology example of unit in proper order.

Figure 17 is the flow chart that the action of unit is estimated and determined in proper order to the quality among expression Figure 16.

Figure 18 is the block diagram that the expression detection determines other topology example of unit in proper order.

Figure 19 is the flow chart that the action of unit is estimated and determined in proper order to the quality among expression Figure 18.

Figure 20 is the block diagram of the topology example of expression noise estimation unit.

Figure 21 is the schematic diagram of the action of expression noise estimation unit.

Figure 22 is the block diagram of topology example that expression comprises the receiver of the signal detector that the 3rd execution mode of the present invention relates to.

Figure 23 is the block diagram of the topology example of the signal detector that relates to of expression the 4th execution mode of the present invention.

Figure 24 is the block diagram of an example of expression parameter information generation method.

Figure 25 is the block diagram of the topology example of expression signal parameter detection unit.

Figure 26 is the block diagram of the topology example of the wireless receiver of expression with wireless transmitter that the 5th execution mode of the present invention relates to and multi-user detector.

Figure 27 is the block diagram of the topology example of the multi-user detector among expression Figure 26.

Figure 28 is the block diagram of the topology example of the channel calculation portion among expression Figure 27.

Figure 29 is the topology example of the multi-user detector under the situation of channel estimating is carried out in expression simultaneously to all signals a block diagram.

Figure 30 is the topology example of the multi-user detector under the situation of channel estimating is individually carried out in expression to each signal a block diagram.

Figure 31 is the block diagram of the topology example of the channel calculation portion among expression Figure 30.

Figure 32 is the block diagram of topology example that expression has the wireless receiver of multistage multi-user detector.

Figure 33 is the block diagram of the topology example of the expression multi-user detector that constitutes multistage multi-user detector.

Figure 34 is the block diagram of the topology example of the channel calculation portion among expression Figure 33.

Symbol description

1,2: transmitter; 10: receiver; 11: pass through variable passband bandpass filter; 12: the signal parameter detection unit; 13: detection determines the unit in proper order; 14: parameter control unit; 15: balanced identifying unit; 16: the copy generation unit; 17: subtracter.

Embodiment

Below, with reference to description of drawings preferred implementation of the present invention.

(the 1st execution mode)

Fig. 3 is the block diagram of topology example that expression comprises the receiver of the signal detector that the 1st execution mode of the present invention relates to.Fig. 4 is the schematic diagram of the signal processing of signal detector.

In Fig. 3, receiver 10 is by constituting with the lower part: carry out frequency band limits to received signal, and can make by frequency band variable pass through variable passband bandpass filter 11 (11 ₁, 11 ₂); Signal parameter detection unit 12, it detects the signal parameter of a plurality of signals that comprise in the received signal; Detection determines unit 13 in proper order, and it is according to received signal and decided the detection order of received signal by the signal parameter that signal parameter detection unit 12 detects; Parameter control unit 14, it controls the frequency band that passes through by variable passband bandpass filter 11 according to determine detection order that unit 13 is determined and the signal parameter that detects in proper order in signal parameter detection unit 12 by detection; Balanced identifying unit 15 (15 ₁, 15 ₂), it is to carrying out equilibrium and judgement from the output signal by variable passband bandpass filter 11; Copy generation unit 16, its use the result of determination of balanced identifying unit 15 and in equilibrium treatment estimated channel estimation value, generate the copy of received signal; Subtracter 17, it deducts copy signal from received signal.

Send the different signal of signal parameter from transmitter 1 respectively with transmitter 2, receiver 10 receives the received signal A behind these signal plus.Received signal A is transfused to by variable passband bandpass filter 11 ₁, detection determines unit 13 and subtracter 17 in proper order.And the signal bandwidth of signal 1 and signal 2, centre frequency, modulation system etc. send signal parameter, are notified to the signal parameter detection unit 12 of receiver 10 before communication.As an example, use common wireless channel by wireless control signal notification signal parameter before beginning communication.Show the example of the situation of before beginning to communicate by letter, prenoticing herein.

The signal 1 that comprises in the signal parameter detection unit 12 detection received signals and the signal parameter of signal 2 input to detection and determine unit 13 and parameter control unit 14 in proper order.Determine in proper order in the unit 13 that in detection according to received signal A and signal parameter B, decision detects the order of the signal (signal 1 and signal 2) that comprises in the received signal, C inputs to parameter control unit 14 the detection order.Parameter control unit 14 is according to the centre frequency that detects in signal parameter detection unit 12 and the information of signal bandwidth, and control is by variable passband bandpass filter #1 (11 ₁) pass through frequency band so that detection is the 1st signal in proper order passes through, same, be that the modulation system of the 1st signal and chip rate etc. carry out equilibrium and judgement parameters needed input uniform identifying unit #1 (15 in proper order with detection ₁).Equally, using detection is the signal parameter of the 2nd signal in proper order, controls by variable passband bandpass filter #2 (11 ₂) and balanced identifying unit #2 (15 ₂).

By passing through variable passband bandpass filter #1 (11 ₁) signal, shown in the signal G after the frequency band limits of Fig. 4, become the signal of the signal component that has suppressed the frequency band beyond the frequency band that detection is the 1st signal in proper order.Signal G after the frequency band limits is transfused to balanced identifying unit #1 (15 ₁), carry out equilibrium and judgement.At this moment, the result of determination #1 (D that in equilibrium treatment, obtains ₁) and channel estimation value E be transfused to copy generation unit 16.In copy generation unit 16, according to result of determination #1 (D ₁) and channel estimation value E, generate detection and be in proper order the copy signal F of the 1st signal, this copy signal input subtracter 17.Subtracter 17 deducts copy signal F from received signal A, and variable passband bandpass filter #2 (11 is passed through in this result's input ₂).At this moment, be transfused to by variable passband bandpass filter #2 (11 ₂) signal, shown in the signal H behind the removal detected object signal of Fig. 4, become that to deduct detection from received signal be signal behind the 1st the signal in proper order, be the signal that the 2nd signal and noise constitute in proper order promptly by detection.By variable passband bandpass filter #2 (11 ₂) change by frequency band, so that be that the 2nd signal passes through in proper order, the output of filter is input to balanced identifying unit #2 (15 via the detection of parameter control unit 14 appointments ₂).Balanced identifying unit #2 (15 ₂) according to the signal of being imported, to detect order be the balanced of the 2nd signal and judge output result of determination #2 (D ₂).

Like this, can judge correctly that detection is under the condition of the 1st signal in proper order, can be to judge that detection is the 2nd signal in proper order under the less state of the interference volume of the 1st signal in proper order being subjected to detection, so can separate and detect the signal that comprises among the received signal A accurately.

(the 2nd execution mode)

Fig. 5 is the block diagram of topology example that expression comprises the receiver of the signal detector that the 2nd execution mode of the present invention relates to, and is the transmitter in the 1st execution mode shown in Figure 3 that to expand to transmitter be the individual topology example of 1～K for two topology example.To carrying out the functional block of action same as shown in Figure 3, give same sequence number and omit explanation.

In receiver 10, have K respectively by variable passband bandpass filter 11 (11 ₁, 11 ₂,～, 11 _K) and balanced identifying unit 15 (15 ₁, 15 ₂,～, 15 _K), have K-1 copy generation unit 16 (16 ₁, 16 ₂,～, 16 _K-1) and subtracter 17 (17 ₁, 17 ₂,～, 17 _K-1).By variable passband bandpass filter #1 (11 ₁), by variable passband bandpass filter #2 (11 ₂), by variable passband bandpass filter #K (11 _K) change the frequency band that passes through of filter respectively, be that the 2nd signal, the signal that detection is K in proper order pass through respectively in proper order so that detection is the 1st signal, detection in proper order.Passed through variable passband bandpass filter #1, #2 ..., #K signal, be transfused to respectively balanced identifying unit #1, #2 ..., #K.Balanced identifying unit #1, #2 ..., #K carries out equilibrium and judgement to the signal of being imported, the channel estimation value E that obtains in equilibrium treatment ₁, E ₂... with result of determination D ₁, D ₂... input copy generation unit #1, #2 ...Copy generation unit #1, #2 ... generate detection respectively and be in proper order the 1st, the 2nd ... the copy of signal, and input subtracter 17 ₁, 17 ₂...Subtracter #1 (17 ₁) from received signal A, deduct the copy signal F that detection is the 1st signal in proper order ₁, subtracting each other result's input by variable passband bandpass filter #2 (11 ₂) and subtracter #2 (17 ₂).Subtracter #2 (17 ₂) from signal, deduct the copy signal F that detection is the 2nd signal in proper order by subtracter #1 input ₂, pass through variable passband bandpass filter and subtracter to what subtract each other that the result inputs to next stage.Like this, by beginning from received signal, to remove one by one from detection order higher signal, be transfused to the signal that passes through variable passband bandpass filter of regulation level, become and from the object signal of passing through at this filter, deduct detection, can separate and take out signal accurately in proper order for the signal after the copy signal of upper signal.

Fig. 6 is the block diagram that the expression detection determines the topology example of unit 13 in proper order, is estimated to determine unit 132 to constitute with order by mutual interference volume estimation unit 131 and quality.

Mutual interference volume estimation unit 131 is according to a plurality of mutual interference among signals amounts that comprise in received signal A and the signal parameter B estimating received signal (estimating mutual interference volume I), and the input quality is estimated and order determines unit 132., signal a is made as I (a, b) to the estimated value of the interference volume of signal b herein, can utilizes following formula (1) expression to estimate mutual interference volume I.In addition, interference volume estimated value I (a, a) is the power of signal a.

[formula 1]

Formula (1)

Fig. 7 is the flow chart that the action of unit 132 is estimated and determined in proper order to the quality in the presentation graphs 8.Quality is estimated and order determines unit 132 to decide the detection order according to flow process shown in Figure 7.

At first, as initial setting, detection order i is set at ' 1 ' (step S10).Then, judge i whether with received signal in the number of the signal that comprises equate (step S11).Under unequal situation, change step S12 over to, end process under situation about equating.At step S12, use the mutual interference volume of in mutual interference volume estimation unit 131, estimating of estimation, estimate the communication quality of each signal.And, utilize following formula (2) to calculate respectively the ratio SIR of the hope signal power corresponding to interfering signal power with the signal that comprises in the received signal _Est, its value for maximum signal as detection order i (step S13).

[formula 2]

$\mathrm{SI}{R}_{\mathrm{est}}\left(l\right)=\frac{I(l,l)}{\underset{m\≠l}{\mathrm{\Σ}}I(m,l)}$ Formula (2)

Then, at step S13, the signal best quality all is made as ' 0 ' (step S14) to the interference volume of other signal and the hope signal power of this signal self.In addition, though power is made as ' 0 ' herein, considers because the generated error of copy signal makes and must remove the more difficult such condition of signal fully, can be power setting small value also.Then, detection order i is added 1 becomes i+1 (step S15), returns step S11.

Determine the detection order by above action.Thus, can be less from the influence of disturbing, communication quality expection good signal begins sequence detection.

Fig. 8 is the block diagram that the expression detection determines other topology example of unit 13 in proper order.In Fig. 8, detection determines that in proper order unit 13 is estimated by mutual interference volume estimation unit 131, quality and order determines unit 133, (E _b/ I _o)-BER correspondence table 134 constitutes.Fig. 9 represents that quality estimation and order determine the action flow chart of unit 133.

Mutually interference volume estimation unit 131 is according to received signal A and signal parameter B, a plurality of mutual interference among signals amounts (estimating mutual interference volume) that comprise in the estimating received signal, and the input quality is estimated and order determines unit 133.

Quality is estimated and order determines unit 133 to move according to the flow chart of Fig. 9.That is,, detection order i is set at ' 1 ' (step S20) as initial setting.Then, judge i whether with received signal in the number (K) of the signal that comprises equate (step S21).Under unequal situation, change step S22 over to, end process under situation about equating.At step S22, the modulation system information X according to estimating to comprise among mutual interference volume I and the signal parameter B estimates the ratio (E of the signal power of per 1 bit to interference power _b/ I _o).Then, according to this estimation (E _b/ I _o) (Y) and modulation system information X, with reference to (E _b/ I _o)-BER correspondence table 134, obtain each signal that comprises among the received signal A the estimation bit error rate [BER (1), BER (2) ... BER (K)] Z (step S23).Herein, BER (p) is the estimation bit error rate of signal p.Then, the detection of estimating the signal that bit error rate is minimum is made as ' i ' (step S24) in proper order, detection all is made as ' 0 ' (step S25) for the signal of ' i ' to the interference volume of other signal and the hope signal power of this signal self in proper order.In addition, though power is made as ' 0 ' herein, considers because the generated error of copy signal makes and remove the more difficult such condition of signal fully, can be power setting small value also.Then, detection order i is added 1 becomes i+1 (step S26), returns step S21.

Determine the detection order by above action.According to this structure, can be contemplated to lower signal from bit error rate and begin sequence detection, can separate and detect the signal that comprises among the received signal A accurately.

Figure 10 is the block diagram of the topology example of the mutual interference volume estimation unit 131 of expression, has: transmission path estimation unit 1311, signal power estimation unit 1312, per unit bandwidth power computing unit 1313, signal overlap state estimation unit 1314 and interference power computing unit 1315.

The transmission path of a plurality of signals that comprise among the transmission path estimation unit 1311 estimating received signal A, estimated transmission path estimation value J is transfused to signal power estimation unit 1312.To the training sequence and the use of transmission path estimation unit 1311 input signal parameters, but also can use pilot frequency code element to come transmission path estimation herein.Signal power estimation unit 1312 is estimated the power of each signal according to the transmission path estimation value J that is imported.

And, as shown in figure 11, also can omit the transmission path estimation unit 1311 of Figure 10, and in signal power estimation unit 1312, correlation detector 13121 use known sequence of symhols (in Figure 11, using training sequence) as an example to received signal A carry out coherent detection, estimate the power of each signal according to the correlation that detects by correlation detector 13121 in power estimation unit 13122.

In Figure 10 and Figure 11, the power estimated value L of each signal is transfused to per unit bandwidth power computing unit 1313, per unit bandwidth power computing unit 1313 uses the information of signal bandwidth, calculate the signal power of the per unit bandwidth of each signal, result of calculation input interference power computing unit 1315.The power of the per unit bandwidth of signal p is made as Wu (p) herein.At this moment, per unit bandwidth power computing unit 1313 as shown in figure 12, instant value P (t) to the power of each estimated in signal power estimation unit 1312 signal carries out time integral, and average by observation time, obtain the power of time per unit, utilize the signal bandwidth information BW among the signal parameter B to remove this power, obtain the signal power calculated value of per unit bandwidth thus.At this moment, utilize following formula (3) to obtain the signal power calculated value of the per unit bandwidth of signal p.

[formula 3]

$W_U\left(p\right)=\frac{{\&Integral;}_{t_0}^{{\mathrm{<figure-callout\; id="0"\; label="t"\; filenames="A20051010769900491.png,A20051010769900521.png"\; state="\{\{state\}\}">t</figure-callout>}}_0+T_0}{P}_p\left(t\right)\mathrm{<figure-callout\; id="0"\; label="dt\; T"\; filenames="A20051010769900491.png,A20051010769900521.png"\; state="\{\{state\}\}">dt</figure-callout>}}{T_{}}$ Formula (3)

Herein, Figure 13 represent the power of each signal and per unit bandwidth signal power concern example.Figure 13 represents overlapping received signal 1 (A ₁) and signal 2 (A ₂) and signal 3 (A ₃) example of these 3 signals, the power of each signal is the area in the zone of each signal of expression.And the power of per unit bandwidth probably is the height in the zone of each signal in the presentation graphs.In addition, the power of per 1 bit is the result of the power of per unit bandwidth divided by the sent bit number of per unit bandwidth.

Signal overlap state estimation unit 1314 is according to the information of centre frequency and signal bandwidth, and the bandwidth of the frequency that the signal that comprises among the calculating received signal A is overlapped is this calculated value input interference power computing unit 1315.The overlapping frequency bandwidth of signal p and signal q is made as B herein, _Overlay(p, q).

Use Figure 13 to describe to this.Herein, signal 1 and signal 2 overlapping areas O ₁(zone of phase mutual interference) is positioned at the left end of the frequency band of signal 1, and the bandwidth of this coincidence is made as B _Overlay(1,2).At this moment, obvious formula B _Overlay(1,2)=B _OverlaySet up (2,1).And, signal p is overlapped bandwidth on the signal p, is that the signal bandwidth of signal p is expressed as B _Overlay(p, p).At this moment, signal 1 and signal 3 overlapping areas O ₂Equate with the frequency band of signal 3, so B _Overlay(1,3)=B _Overlay(3,1)=B _Overlay(3,3).And, because signal 2 and signal 3 overlapping areas O ₃Do not exist, so B _Overlay(2,3)=B _Overlay(3,2)=0.In addition, overlapping frequency bandwidth is divided into situation shown in Figure 14 according to centre frequency and signal bandwidth, and utilizes following formula 4～7 to obtain.The centre frequency of signal p and q is made as f respectively herein, _CpAnd f _CpSignal bandwidth is made as BW respectively _pAnd BW _qAnd signal p and signal q are the arbitrary signal that comprises in the received signal, also can substitution signal p and signal q use following formula.

(a) when the service band of signal p comprises the service band of signal q

(that is, work as f _Cq+ BW _q/ 2≤f _Cp+ BW _p/ 2 and f _Cp-BW _p/ 2≤f _Cq-BW _q/ 2 o'clock)

[formula 4]

B _Overlay(p, q)=BW _qFormula (4)

(b) when the upper limit of the service band of signal p is in the service band of signal q

(that is, work as f _Cp+ BW _p/ 2≤f _Cq+ BW _q/ 2 and f _Cp-BW _p/ 2≤fc _q-BW _q/ 2 o'clock)

[formula 5]

B _Overlay(p, q)=(f _Cp+ BW _p/ 2)-(f _Cq-BW _q/ 2) formula (5)

(c) when the lower limit of the service band of signal p is in the service band of signal q

(that is, work as f _Cq+ BW _q/ 2≤f _Cp+ BW _p/ 2 and f _Cq-BW _q/ 2≤f _Cp-BW _p/ 2 o'clock)

[formula 6]

B _Overlay(p, q)=(f _Cq+ BW _q/ 2)-(f _Cp-BW _p/ 2) formula (6)

(d) when the service band of the service band of signal p and signal q is not overlapping

(that is, work as f _Cq+ BW _q/ 2≤f _Cp-BW _p/ 2 or f _Cp+ BW _p/ 2≤f _Cq-BW _q/ 2 o'clock)

[formula 7]

B _Overlay(p, q)=0 formula (7)

In interference power computing unit 1315,, calculate and estimate mutual interference volume I according to the signal power calculated value M of per unit bandwidth that imported, each signal and the overlapping frequency bandwidth 0 between a plurality of signal.The power of per unit bandwidth that at this moment, can be by frequency bandwidth that signal p and signal q is overlapping and signal p multiplies each other and obtains the interference volume that signal q is subjected to signal p.That is, can utilize following formula (8) to calculate and estimate mutual interference volume I (p, q).

[formula 8]

I (p, q)=W _u(p) B _OverlayFormula (8)

Figure 15 is the schematic diagram of the mutual interference volume of expression.2 pairs of signals of region representation signal 1 of P produce the interference signals part among the figure, and this regional power probably is Wu (2) B _Overlay(2,1)=I (2,1).And 3 pairs of signals of region representation signal 1 of Q produce the interference signals part among the figure, and this regional power probably is Wu (3) B _Overlay(3,1)=I (3,1).That is, total interference volume of signal 1 acceptance is I (2,1)+I (3,1).At this moment, the power of signal 1 is Wu (1) B _Overlay(1,1)=I (1,1) is so the estimation communication quality of signal 1 (this moment is for estimating SIR) can utilize following formula (9) expression.

[formula 9]

${\mathrm{SIR}}_{\mathrm{est}}\left(1\right)=\frac{I\left(\mathrm{1,1}\right)}{I\left(\mathrm{2,1}\right)+I\left(\mathrm{3,1}\right)}$ Formula (9)

Equally, also can easily obtain the estimation communication quality at signal 2, signal 3.

In addition, in the signal detector of Fig. 3, also can constitute to balanced identifying unit 15 and import and use the transmission path estimation value J that in Figure 10, obtains.

Figure 16 is illustrated in the block diagram that the detection that comprises in the received signal under the situation of using the signal that spreading code communicates determines the topology example of unit 13 in proper order.Figure 17 is the flow chart that the action of unit 132 is estimated and determined in proper order to the quality among expression Figure 16.

In Figure 16, identical with Fig. 6, in mutual interference volume estimation unit 131, obtaining and estimating mutual interference volume I, multiply by value SF (p) I (p, p) that spread spectrum rate SF (p) obtains afterwards but use the spread spectrum rate information R of input, the power I of each signal (p, p) to become as signal parameter B this moment.In this structure,, also can carry out correspondence by spread spectrum rate information is made as ' 1 ' even for the signal that does not use spreading code.At this moment, the hope signal power in the comparison of the communication quality in the motion flow of Figure 17 (step S32) can utilize following formula (10) to calculate to the ratio of interfering signal power, can consider that spreading gain decides the detection order.Like this, even, also can determine the detection order effectively, can separate and take out signal accurately for being mixed with signal that uses spreading code and the received signal of not using the signal of spreading code.

[formula 10]

$\frac{\mathrm{SF}\left(l\right)\&CenterDot;I(l,l)}{\underset{m\&NotEqual;l}{\mathrm{\&Sigma;}}I(m,l)}$ Formula (10)

Figure 18 is the block diagram that the expression detection determines other topology example of unit 13 in proper order.This structure chart determines unit 13 to append noise estimation unit 135 to the detection of Fig. 6 in proper order, and the action of other parts is identical, so omit explanation.

Interference volume estimation unit 131 is according to received signal A and signal parameter B mutually, and the mutual interference volume of a plurality of signals that comprise among the estimating received signal A will estimate that mutual interference volume I input quality is estimated and order determines unit 132.Noise estimation unit 135 is according to received signal A and signal parameter B, and the noise power that a plurality of signals that comprise among the estimating received signal A are accepted is respectively estimated estimating noise power T input quality and order determines unit 132.Quality is estimated and order determines unit 132 according to mutual interference volume I of the estimation of being imported and estimating noise power T, according to the motion flow decision detection order of Figure 19.The motion flow of Figure 19 is identical with the motion flow of Fig. 7, has only and whether the communication quality that determines benchmark as order is considered noise this point difference.Specifically, as initial setting, detection order i is set at ' 1 ' (step S40).Then, judge i whether with received signal in the number of the signal that comprises equate (step S41).Under unequal situation, change step S42 over to, end process under situation about equating.At step S42, obtain the ratio of a plurality of signals relative interfering signal power+noise power of signal power separately that comprises among the received signal A, the highest signal of this ratio is made as detection order i.Then, at step S42, making the power of the best signal of quality is ' 0 '.That is, this signal all is made as ' 0 ' (step S43) to the interference volume of other signal and the hope signal power of this signal self.Then, detection order i is added 1 becomes i+1 (step S44), returns step S41.Like this, reuse under the situation of frequency band, can estimate the The noise that each signal is accepted accurately, can determine the detection order effectively at the signal that a plurality of signal bandwidths are different.

In addition, in the present embodiment, use the The noise of being obtained,, calculate the relative interference of signal power of per 1 bit and the ratio E of noise power in the mode identical with Fig. 8 _b/ (I _o+ N _o), use this value to obtain the estimation bit error rate, can determine the detection order in view of the above.

Figure 20 is the block diagram of the topology example of expression noise estimation unit 135, has copy signal generation unit 1351, subtracter 1352, band pass filter 1353 (1353 ₁, 1353 ₂,～, 1353 _k) and noise power estimation unit 1354.Figure 21 represents the action schematic diagram of noise estimation unit 135.

Copy signal generation unit 1351 is according to the training sequence among received signal A and the signal parameter B, generates the copy of a plurality of signals that comprise among the received signal A, output as they and the copy U of received signal, and input subtracter 1352.Subtracter 1352 deducts received signal copy U from received signal A.Like this,, the noise contribution residue is only arranged, can obtain residual signal V by deduct received signal copy U from received signal A.Then, residual signal V is transfused to band pass filter 1353.Band pass filter 1353 carries out frequency band limits according to the frequency band of a plurality of signals that comprise in the received signal to residual signal V.Specifically, be N (f) at the Fourier transform of establishing residual signal, establish the band pass filter 1353 of respective signal p _pBe H _p(f) time, can be used as following formula (11) (N _HThe inverse fourier transform of (p, f)) is obtained and has been passed through the noise behind the band pass filter.

[formula 11]

N _H(p, f)=N (f) H _P(f) formula (11)

Wherein, H _p(f) representing to establish by frequency band is service band (that is f, of signal p _Cp-BW _p/ 2≤f≤f _Cp+ BW _p/ 2).At this moment, as shown in figure 21, the frequency band of exporting according to each signal that comprises the received signal A from band pass filter 1353 has carried out the noise W (W after the frequency band limits ₁, W ₂, W ₃).That thus, can estimate to have passed through Fig. 3 passes through the remaining noise contributions in variable passband bandpass filter 11 backs.The noise W that has been carried out frequency band limits that is exported is transfused to noise power estimation unit 1354, the power of the noise that each signal that comprises among the following formula estimating received signal A of noise power estimation unit 1354 uses is accepted, and export its result.

[formula 12]

$N_p={\&Integral;}_{-\&infin;}^{\&infin;}\left|N_H(p,f)\right|\mathrm{df}$ Formula (12)

By above processing, the noise power that the noise that comprises in can estimating received signal A and each signal are accepted respectively.

(the 3rd execution mode)

Figure 22 is the block diagram of topology example that expression comprises the receiver of the signal detector that the 3rd execution mode of the present invention relates to.Like this, the present invention also can form and append error correction decoder 151 (151 ₁, 151 ₂) and the structure of error correcting encoder 152.During this situation, the output of balanced identifying unit #1 is transfused to error correction decoder 151 ₁, decode according to the error correction/encoding method that is sent out as the transmission signal parameter, its result is exported as result of determination #1 (D1).Result of determination #1 (D1) is transfused to error correcting encoder 152, encodes according to the coding method identical with transmitter side, and the signal behind the coding is transfused to copy generation unit 16.Like this, the wrong less signal after the use error correction generates copy signal, generates the deterioration of precision so can prevent the copy signal that causes because of decision error, can separate accurately and detection signal.

(the 4th execution mode)

Figure 23 is the block diagram of the topology example of the signal detector that relates to of expression the 4th execution mode of the present invention, has by by variable passband bandpass filter 11 (11 ₁, 11 ₂, 11 ₃,～, 11 _k), balanced identifying unit 15 (15 ₁, 15 ₂, 15 ₃,～, 15 _k) and copy generation unit 16 (16 ₁, 16 ₂, 16 ₃,～, 16 _k) a plurality of levels 18 (18 of constituting ₁, 18 ,～, 18 _N).In addition, identical with the structure of Fig. 3 in this figure, determine unit 13 and parameter control unit 14 in proper order by signal parameter detection unit 12, detection, control is by the action of variable passband bandpass filter 11 and balanced identifying unit 15.

At the 1st grade 18 ₁In, identical with the signal detector of Fig. 3, according to the detection order that determines decision in the unit 13 in detection in proper order, judge carry out equilibrium via the signal that has carried out frequency band limits by variable passband bandpass filter 11, obtain result of determination (result of determination).Copy generation unit 16 is according to result of determination and channel estimation value, generates the detection that comprises among the received signal A and is in proper order the copy of the 2nd and the 2nd later each signal, and import the 2nd grade 18 ₂At the 2nd grade 18 ₂In, will from received signal A, deduct at the 1st grade 18 ₁In the detection that generates be the signal that obtains behind the copy of the 2nd and the 2nd later signal in proper order, input and detection be in proper order the 1st signal corresponding pass through variable passband bandpass filter #1b.In passing through variable passband bandpass filter #1b, the signal of being imported is carried out frequency band limits, to carry out the signal input uniform identifying unit #1b after the frequency band limits, in balanced identifying unit #1b, the signal of being imported is carried out equilibrium and judge, with result of determination (secondary result of determination) and channel estimation value input copy generation unit #1b.At this moment, be transfused to signal, in received signal, contain interference signal, and the signal that is transfused to by variable passband bandpass filter #1b be to have deducted at the 1st grade 18 by variable passband bandpass filter #1a ₁The signal that obtains after the middle copy signal that generates has obtained the signal that suppresses so become the influence of interference.Therefore, the influence of the interference signal in the balanced identifying unit 15 is inhibited, and compares with the 1st grade, can obtain more correct channel estimation value.Then, in copy generation unit #1b, generate the copy that detection is the 1st signal in proper order according to the secondary result of determination of being imported and channel estimation value.

To be transfused to the detection that deducts from received signal A the 1st grade of generation be the 3rd and the 3rd later signal copy in proper order and be the residual signal that obtains behind the 1st the signal copy in proper order in the detection that copy generation unit #1b generates by variable passband bandpass filter #2b.Below identical, with detection be in proper order the signal of n corresponding pass through variable passband bandpass filter #nb, be transfused to the detection that from received signal A, deducts the 1st grade of generation and be in proper order the residual signal that obtains behind later signal copy of n+1 and n+1 and the signal copy before the detection of the 2nd grade of generation is n-1 and n-1 in proper order.These input signals are carried out frequency band limits and balanced judgement, and copy generation unit 16 is according to the secondary result of determination and the channel estimation value ghost signal of balanced identifying unit 15.

Like this, in the q level, use the copy signal that generates in the q-1 level to make the channel estimation value high precision int, make the accuracy of result of determination higher.When establishing progression and be N, the result of determination of the balanced identifying unit 15 of N level is exported as the final decision result.

By taking above structure, can suppress the sum of errors decision error of the channel estimation value that the influence because of interference signal in the structure shown in Figure 3 causes, accurately separation signal.

Figure 24 and Figure 25 are the figure of an example of expression signal parameter detection method.In Figure 24 and Figure 25, in transceiver, preserve relevant with the modulation system that might be used, signal bandwidth and centre frequency etc., identical table at message pick-up and in sending.Transmitter side is selected from this table and the signal parameter corresponding sequence number that will use, generates data sequence, sends this data sequence before communication.For example, the transmission modulation system is that QPSK, signal bandwidth are BWc, when centre frequency is the signal of fcB, data sequenceization and modulation are carried out in " No. " " 2 ", " 3 ", " 2 ", sends before communication.At receiver side, as shown in figure 25, use identical table, equally to all the combination formation sequences and the modulation of the parameter that might be used, and use it in correlation detector 121, to carry out coherent detection.In parameter determination section 122, be judged to be the signal parameters such as modulation system, signal bandwidth and centre frequency corresponding and be used with the highest sequence of coherent detection result, export as signal parameter B.Like this, needn't use control channel alone to send signal parameter, so can realize effective use of frequency resource.

(the 5th execution mode)

Signal for detecting front as noise processed, carries out equilibrium treatment to the signal of detection order this signal after, so the precision deterioration of the deterioration of the accuracy of detection that generation causes thus and the copy that generated.

Below, Figure 26 is the block diagram of the topology example of the expression wireless transmitter that relates to of the 5th execution mode of the present invention and the wireless receiver with multi-user detector.

In Figure 26, transmitter 5-1 (5-1a, 5-1b, 5-1c) is by constituting with the lower part: modulator 5-11 (5-11a, 5-11b, 5-11c), frequency band limits filter 5-12 (5-12a, 5-12b, 5-12c), transmitter side low pass filter 5-13 (5-13a, 5-13b, 5-13c), base band-RF (Radio Frequency: wireless frequency) converter section 5-14 (5-14a, 5-14b, 5-14c), antenna 5-15 (5-15a, 5-15b, 5-15c) and encoding section 5-16 (5-16a, 5-16b).Under the situation of not carrying out error correction, omit encoding section 5-16.

Receiver 5-2 is by constituting with the lower part: the RF-baseband-converted 5-20 of portion (5-20a, 5-20b), receiver side low pass filter 5-21 (5-21a, 5-21b), multi-user detector 5-22, high output amplifier 5-26 (5-26a, 5-26b) and antenna 5-25 (5-25a, 5-25b).In addition, the quantity that figure 26 illustrates reception antenna is 2 situation.

Transmitter 5-1 is sending data 5-10 (5-10a, 5-10b, 5-10c) or being input to modulator 5-11 by the data that encoding section 5-16 has carried out error correction coding, and modulator 5-11 modulates the data of being imported, and is mapped to the point on the signal space.Frequency band limits filter 5-12 carries out waveform shaping to carried out the signal after the modulation in modulator 5-11.Base band-RF converter section 5-14 is by amplifying the signal that is converted into the RF frequency band with frequency inverted etc. to the baseband signal after the restricted band.The radio-frequency component of the signal after the conversion of transmitter side low pass filter 5-13 blanketing frequency.The signal that has suppressed radio-frequency component by transmitter side low pass filter 5-13 is launched via transmitting antenna 5-15.

The signal that sends from transmitting antenna 5-15 receives by the reception antenna 5-25 that transmission path 5-3 (5-3a, 5-3b, 5-3c) is received machine 5-2.After the signal that is received is exaggerated by high output amplifier 5-26, by receiver side low pass filter 5-21 suppress noise outside the received signal frequency band, be converted into baseband signal by the RF-baseband-converted 5-20 of portion again.Baseband signal is transfused to multi-user detector 5-22.Multi-user detector 5-22 with reference to received signal in the relevant signal message 5-24 of signal that comprises, output receives data judging 5-23 (5-23a, 5-23b, 5-23c) as a result according to baseband signal.

Figure 27 represents the topology example of multi-user detector 5-22.In Figure 27, multi-user detector 5-22 is by constituting with the lower part: frequency band limits filter 220 (220a, 220b, 220c), channel calculation portion 221 (221a, 221b, 221c), MMSE filter 222 (222a, 222b, 222c), soft input and output decoder 223 (223a, 223b, 223c), copy maker 224 (224a, 224b) and subtracter 225 (2253a, 225b).

In multi-user detector 5-22, at first, utilize detection be in proper order the 1st signal (below, is detection that the signal of k calls k detected object signal in proper order) frequency band limits filter 220a, input signal r is carried out frequency band limits, the input of the signal after restricted band MMSE filter 222a.In the 221a of channel calculation portion, according to information and transmitter side filtering information, calculate the channel status of the ISI state till each user's who comprises among the input signal r frequency band limits filter 220a signal, that considered the 1st detected object signal from transmitter side frequency band limits filter 5-12 to receiver side from the chip rate information of each user's who comprises in the information that accepts filter of the 1st detected object signal of frequency band limits filter 220a and the received signal signal, timing information, transmission path 5-3.

Herein, when low pass filter 5-13, the 5-21 of hypothesis reception and transmission move ideally and do not have distorted signals, when the modulation signal vector the k detection signal is made as b _k, the transmitting filter matrix is made as G _{TX, k}, the matrix of the state of transmission path 5-3 is made as H _{P, k}, noise vector be made as n, when the sum of the signal of detected object is made as K, input signal r can be expressed as following formula.In addition, τ k represents the arrival timing of each signal.

[formula 13]

$r=\underset{k=I}{\overset{K}{\mathrm{\&Sigma;}}}{H}_{p,k}{G}_{\mathrm{Tx},k}\left({\mathrm{\&tau;}}_k\right)b_k+n$ Formula (13)

At this moment, input signal r can utilize following formula to explain.

[formula 14]

R=[r ^*(0) ..., r ^*(D ₁)] ^HFormula (14)

At this moment, D ₁The sample points of+1 expression the 1st detected object signal at " * " shown in the upper right corner of vector and even matrix, " H ", is represented complex conjugate, complex-conjugate transpose respectively.And r (m) expression is mT constantly _S1Received signal, T _SkThe time interval of representing the sample of k detected object signal.Herein, the code element number when the modulation signal of establishing transmission is M _kWhen individual, b _kCan utilize following formula to explain.b _k(m) m+1 modulation signal of expression k detected object signal.

[formula 15]

$b_k=[b_k^{*}(M_k-1),...,b_k^{*}\left(0\right){]}^H$ Formula (15)

And, send filtering matrix G _{TX, k}For:

[formula 16]

Formula (16)

At this moment, the time response function of the frequency band limits filter 5-12 in the transmission of gk (t) expression k detected object signal decides according to the bandwidth of passing through of k detected object signal.And Tk represents the symbol time of k detected object signal, gives chip rate according to 1/Tk.

The matrix H of transmission path state _{P, k}Can utilize following formula to explain.

[formula 17]

Formula (17)

At this moment, (p is to be illustrated among the received signal r (p) received q to postpone ripple (time of delay: qT q) to hk _S1) amplitude and the plural number of the amount of phase rotation.

At this moment, use the matrix G of expression frequency band limits filter 220a _{Rx, 1}:

[formula 18]

Formula (18)

Become by the signal behind the frequency band limits filter 220a of receiver side:

[formula 19]

$G_{\mathrm{Rx},1}^{H}r=\underset{k=1}{\overset{K}{\mathrm{\&Sigma;}}}{G}_{\mathrm{Rx},1}^H{H}_{p,k}{G}_{\mathrm{Tx},k}\left({\mathrm{\&tau;}}_k\right)b_k+G_{\mathrm{Rx},1}n$ Formula (19)

At this moment, regularly take a sample to received signal, that is,, regularly only relatively be offset time τ 1 from the 2nd arrival to the K received signal when when moment mTS1+ τ 1 takes a sample to received signal according to the arrival of the 1st detected object signal.That is, by the signal behind the receiving filter 220a:

[formula 20] formula (20)

$G_{\mathrm{Rx},1}^{H}r=\underset{k=1}{\overset{K}{\mathrm{\&Sigma;}}}{G}_{\mathrm{Rx},1}^H{H}_{p,k}{G}_{\mathrm{Tx},k}({\mathrm{\&tau;}}_k-{\mathrm{\&tau;}}_1)b_k+G_{\mathrm{Rx},1}n$

At this moment, the 221a of channel calculation portion is calculated as following formula to the channel matrix of k detected object signal according to formula (20).

[formula 21]

G _{Rx, 1} ^HH _{P, k}G _{Tx, k}(τ _k-τ ₁) formula (21)

Equally, the channel calculation portion 221 in the m detected object Signal Processing piece is calculated as following formula to the channel matrix of k detected object signal.

[formula 22]

G _{Rx, m} ^HH _{P, k}G _{Tx, k}(τ _k-τ _m) formula (22)

Figure 28 represents the topology example of the block diagram of the channel calculation portion in the m detected object Signal Processing piece.

In addition, below for simply, establish channel matrix k detected object signal, m detected object Signal Processing and be:

[formula 23]

$Q_{k,m}=G_{\mathrm{Rx},m}^H{H}_{p,k}{G}_{\mathrm{Tx},k}({\mathrm{\&tau;}}_k-{\mathrm{\&tau;}}_m)$ Formula (23)

Thus, can easily calculate and consider because the channel status of the ISI that the difference of passing through frequency band of the filter of not considering in the method for non-patent literature 3 produces, compare with use the situation of fractional spaced type coefficient variable filter according to the method for non-patent literature 4, can suppress the increase of amount of calculation and the deterioration of precision of channel estimation.

According to the channel matrix that calculates as mentioned above, MMSE filter 222a utilizes the filter factor w (u) of following formula calculating at u code element of the 1st detected object signal.

[formula 24]

$w_1\left(u\right)={(Q_{l,1}{Q}_{l,1}^H+\underset{k=2}{\overset{K}{\mathrm{\&Sigma;}}}{Q}_{k,1}{\mathrm{\&Lambda;}}_k{Q}_{k,1}^H+{\mathrm{\&sigma;}}^2{I}_1)}^{-1}{Q}_{l,1}{e}_u$ Formula (24)

Herein, eu represents only to detect the vector of the capable composition of u of matrix, σ ²The average power of expression noise, I ₁Expression M ₁* M ₁Unit matrix.Ak represents the sequence of symhols copy that sequence of symhols bk on the actual signal space that sends of k detected object signal and modulation back generate:

[formula 25]

 _kThe covariance matrix of the residual quantity of formula (25), for:

[formula 26]

Cov (b _k- _k) formula (26)

In addition, this covariance matrix is under the situation that does not have generated code metasequence copy fully, promptly from input signal, do not deduct under the situation of copy signal of k detected object signal and be unit matrix, otherwise, at ghost accurately, and deduct accurately under the situation of copy, then be approximately null matrix.Herein, when carrying out the 1st detected object Signal Processing, because do not carry out the subtraction of the copy of any signal, so for all k, Λ k is unit matrix.

Use the filter factor w1 (u) that obtains like this, carry out following equilibrium treatment to received signal.

[formula 27]

$s_1\left(u\right)=w_1{\left(u\right)}^H{G}_{\mathrm{Rx},1}r$ Formula (27)

Thus, different with the method shown in the non-patent literature 2 that other users' that become interference signal is handled as noise, signal to other users of becoming interference, carrying out based on making square error is the equilibrium treatment of the MMSE benchmark of minimum, so can obtain more high-precision signal detecting result.

Signal after this equilibrium treatment is transfused to soft input and output decoder 223a.The 1st detected object signal of soft input and output decoder 223a after to the equilibrium treatment of being imported if encode at transmitter side then consider coding, receives the judgement of data and calculates at the likelihood that sends code element.Herein, be under the situation of BPSK in modulation system, the logarithm value of likelihood ratio is that log-likelihood ratio λ 1 (u) is expressed as follows.

[formula 28]

${\mathrm{\&lambda;}}_1\left(u\right)=\log \frac{\mathrm{Pr}\left(s_1\left(u\right)\right|b_1\left(u\right)=+1)}{\mathrm{Pr}\left(s_1\left(u\right)\right|b_1\left(u\right)=-1)}$ Formula (28)

Then, copy maker 224 uses the likelihood of being obtained by soft input and output decoder 223, the copy of generated code metasequence.If establish the copy of sequence of symhols be:

[formula 29]

${\hat{b}}_1=[{\hat{b}}_1^{*}(M_1-1),...,{\hat{b}}_1^{*}\left(0\right){]}^H$ Formula (29)

Then the copy of u code element can calculate by following formula.

[formula 30]

${\hat{b}}_1\left(u\right)=\tanh \left[\frac{{\mathrm{\&lambda;}}_1\left(u\right)}{2}\right]$ Formula (30)

The copy of this sequence of symhols is transfused to the MMSE filter as the Signal Processing portion of later detected object.And, consider to send filtering and receive timing, utilize following formula to obtain the copy of the received signal of the 1st detected object signal,

[formula 31]

H _{P, 1}G _{Tx, 1}(τ ₁)  ₁Formula (31)

And input is configured in the subtracter 225 of prime of the frequency band limits filter of the 2nd detected object signal.

Then, change the signal processing of the 2nd detected object signal over to.

The 2nd detected object Signal Processing at first deducts the copy of the 1st detected object signal from input signal.And, use utilize following formula statement subtract the calculation result,

[formula 32]

R-H _{P, 1}G _{Tx, 1}(τ ₁)  ₁Formula (32)

Carry out and the identical processing of the 1st detected object signal.Equally, m detected object signal uses following formula to carry out signal processing.

[formula 33]

$r-\underset{k=1}{\overset{m-1}{\mathrm{\&Sigma;}}}{H}_{p,k}{G}_{\mathrm{Tx},k}\left({\mathrm{\&tau;}}_k\right){\hat{b}}_k$ Formula (33)

And in the detection of m detected object signal was handled, also restituted signal one by one generated the copy of m detected object signal according to the signal of this demodulation result, uses this copy to remove the ISI composition that produces because of the influence that postpones ripple.

In addition, in the present embodiment, the example of influence of the frequency band limits filter 220 of the frequency band limits filter 5-12 that only considers transmitter side and receiver side has been described, but in receiving the low pass filter that sends, thinking also there is the situation that makes the signal waveform distortion and produce ISI.In this case, the matrix when the impulse response of establishing the transmitter side low pass filter 5-13 that represents k detected object signal is L _{Tx, k}, the matrix of establishing the impulse response of expression receiver side low pass filter 5-21 is L _{Rx, k}The time, the channel matrix of k detected object signal calculates in the channel calculation portion 221 of m detected object Signal Processing by following formula:

[formula 34]

G _{Rx, m} ^HL _{Rx, m} ^HH _{P, k}L _{Tx, k}G _{Tx, k}(τ _k-τ _m) formula (34)

Multiuser Detection is carried out in the influence that can consider low pass filter 5-13,5-21 thus.

And if matrix is very big, then the operand of inverse matrix calculating becomes very big.Therefore,, in channel matrix, do not consider the ISI code element that only smaller or equal to regulation power the time, exerts an influence, thereby channel matrix is diminished, reduce operand becoming the code element of demodulation object.

Figure 29 is the block diagram of the topology example of expression when estimating channel status simultaneously at all detected object signals.In this topology example, by transmission path estimation portion 226 transmission path estimation information:

[formula 35]

[H _{P, 1}..., H _{P, K}] formula (35)

Replace actual transmission path information, use estimated transmission path estimation value:

[formula 36]

$[{\hat{H}}_{p,1},...,{\hat{H}}_{p,K}]$ Formula (36)

Carry out the action identical with Figure 27.In transmission path estimation portion 226, consider the reception timing of each signal, training symbol or direct symbol etc. are multiplied each other with reference to code element and transmission filtering matrix, use then RLS (Recursive Least Square: recurrence least square) algorithm or LMS (LeastMean Square: algorithm lowest mean square), carry out transmission path estimation.By multiply by the transmission filtering matrix in advance, the influence of the ISI that causes because of filter can be reflected in the transmission path estimation.Thus, the state of transmission path estimation accurately.

Figure 30 is the block diagram of the topology example of expression when each detected object signal individually estimated channel status.In this structure, in m detected object Signal Processing portion,, estimate the transmission path of m detected object signal by behind the frequency band limits filter 220.Transmission path estimation with estimate identically simultaneously, consider the ISI that the influence because of the filter of transmitter side produces, use RLS algorithm or LMS algorithm to carry out.

Figure 31 is the block diagram of the topology example of the channel calculation portion among expression Figure 30.In the channel calculation portion 221 of m detected object Signal Processing, owing to only proceed to transmission path estimation till the m detected object signal, so the transmission path estimation value relevant with the later detected object signal of m+1 and m+1 calculated by 0.

Figure 32 is the block diagram of topology example that expression has the receiver of multi-user detector.In this topology example, receiver 5-2 has the multistage multi-user detector 5-27 that file connects a plurality of multi-user detector 5-28 (5-28a, 5-28b, 5-28c) and constitute.In multistage multi-user detector 5-27, the sequence of symhols copy that use generates in the detection of the 1st grade multi-user detector 5-28 is handled in 1+1 level multi-user detector:

[formula 37]

[ ₁ ^(l)...,  _K ^(l)] formula (37)

And copy signal:

[formula 38]

$[{\hat{H}}_{p,1}^{\left(l\right)}{G}_{\mathrm{Tx},1}\left({\mathrm{\&tau;}}_1\right){\hat{b}}_1^{\left(l\right)},...,{\hat{H}}_{p,K}^{\left(l\right)}{G}_{\mathrm{Tx},K}\left({\mathrm{\&tau;}}_K\right){\hat{b}}_K^{\left(l\right)}]$ Formula (38)

Carry out repeated signal and detect processing, improve the precision of Multiuser Detection thus.

Figure 33 is the block diagram of topology example of the multi-user detector 5-28 of expression multistage multi-user detector 5-27 inside.Figure 33 represents that reception antenna quantity is 2 example.The 1st grade of multi-user detector 5-28 deducts the copy signal that is generated by 1-1 level multi-user detector from input signal r in the detection of the 1st detected object signal is handled, use the signal of this subtraction result:

[formula 39]

$r-\underset{k-2}{\overset{K}{\mathrm{\&Sigma;}}}{H}_{p,k}^{(l-1)}{G}_{\mathrm{Tx},k}\left({\mathrm{\&tau;}}_k\right){\hat{b}}_k^{(l-1)}$ Formula (39)

Carrying out input handles.In the detection of m detected object signal was handled, the copy of the detected object signal before m-1 and the m-1 was updated, so the signal that uses the result that deducts the copy after this renewals promptly to explain with following formula.

[formula 40]

$r-\underset{k=m+1}{\overset{K}{\mathrm{\&Sigma;}}}{H}_{p,k}^{(l-1)}{G}_{\mathrm{Tx},k}\left({\mathrm{\&tau;}}_k\right){\hat{b}}_k^{(l-1)}-\underset{k=1}{\overset{m-1}{\mathrm{\&Sigma;}}}{H}_{p,k}^{\left(l\right)}{G}_{\mathrm{Tx},k}\left({\mathrm{\&tau;}}_k\right){\hat{b}}_k^{\left(l\right)}$ Formula (40)

Figure 34 represents the topology example of the channel calculation portion of multistage multi-user detector 5-27.In the channel calculation portion 221 of m detected object signal, the transmission path estimation value of the detected object signal before m and the m is updated, so use the value after this renewal to come the calculating channel matrix.Thus, when transmission path estimation value was upgraded one by one, channel matrix was also upgraded simultaneously, can realize high-precision Signal Separation.

More than, preferred implementation according to the present invention has illustrated the present invention.Herein, specific concrete example is shown the present invention has been described, still, under the situation of aim of the present invention that does not break away from claims definition and scope, certainly these concrete examples are carried out various modifications and changes.That is, can not be interpreted as utilizing the detailed content of concrete example and accompanying drawing to limit the present invention.

Claims (16)

1. signal detector, it is set on the receiver of employed Wireless Telecom Equipment in wireless communications environment, a plurality of Wireless Telecom Equipments utilize different signal bandwidths to communicate mutually with different carrier frequencies in this wireless communications environment, it is characterized in that this signal detector has:

By variable passband bandpass filter, it utilizes the variable signal that passes through outside the frequency band of frequency band in to received signal to limit;

The signal parameter detection unit, it detects a plurality of signals signal parameter separately that comprises in the described received signal;

Detection determines the unit in proper order, and it detects the detection order of described signal from described received signal according to described signal parameter decision;

Parameter control unit, it controls the described frequency band that passes through by variable passband bandpass filter according to described detection order and described signal parameter; And

Balanced identifying unit, it is to carrying out equilibrium and judgement from the described described signal that has carried out frequency band limits by variable passband bandpass filter,

According to the detection order, by variable passband bandpass filter and balanced identifying unit, the described a plurality of signals that comprise in the described received signal are separated from described received signal successively by described.

2. signal detector according to claim 1 is characterized in that, described detection determines that in proper order the unit has:

Mutual interference volume estimation unit, it estimates described a plurality of mutual interference among signals amounts of comprising in the described received signal; And

Quality is estimated and order determines the unit, it is according to the mutual interference volume of described estimation, decision detects the detection order of described a plurality of signals from described received signal, and decision is used as the quality of benchmark when according to the rules detection comes decision signal in proper order, can think by the detection order than the level of the caused mutual interference volume of the signal of given front the quality when estimating to determine described detection order smaller or equal to regulation.

3. signal detector according to claim 2 is characterized in that, described mutual interference volume estimation unit has:

Power estimation unit, it estimates the received power of described a plurality of signals of comprising in the described received signal;

The power calculation unit of per unit bandwidth, it calculates the power of described a plurality of signal per unit bandwidth separately according to described signal parameter with by the estimated described power of described power estimation unit;

The signal overlap estimation unit, it estimates the overlapping frequency bandwidth of described a plurality of signal overlap and phase mutual interference according to described signal parameter; And

The interference volume computing unit, it calculates described mutual interference volume according to the signal power and the described overlapping frequency bandwidth of described per unit bandwidth.

4. signal detector according to claim 3, it is characterized in that, described mutual interference volume estimation unit has transmission path estimation portion, this transmission path estimation portion is at each the signal transmission path estimation estimated value that comprises in the described received signal, this transmission path estimation value is represented the state of the transmission path that broadens along time shaft

Described power estimation unit uses the transmission path estimation value of the main ripple of described each signal to come estimating power.

5. signal detector according to claim 3 is characterized in that, described power estimation unit uses known sequence of symhols to carry out coherent detection, thereby estimates the power of described each signal.

6. signal detector according to claim 3, it is characterized in that, described signal power estimated value during the power calculation unit of described per unit bandwidth utilizes the signal bandwidth that comprises in the described signal parameter to the estimated stipulated time averages, thereby calculates the signal power of the per unit bandwidth of described each signal.

7. signal detector according to claim 3, it is characterized in that, described signal overlap estimation unit calculates the upper and lower bound of the frequency band of described each signal according to carrier wave frequency information that comprises in the described signal parameter and signal bandwidth information, and the more described upper limit and described lower limit between all signals that in described received signal, comprise, to estimate described overlapping frequency bandwidth.

8. signal detector according to claim 3, it is characterized in that, described interference volume computing unit multiplies each other the signal power and the described overlapping frequency bandwidth of the described per unit bandwidth of described each signal, thereby calculates the interference power between the described signal that comprises in the described received signal.

9. signal detector according to claim 1 is characterized in that, described detection determines that in proper order the unit has:

Mutual interference volume estimation unit, it is estimated by the mutual interference volume that described signal overlapping and the phase mutual interference causes on frequency axis that comprises in the described received signal according to the signal parameter of described received signal and described each signal;

Noise estimation unit, it estimates the noise of described each signal according to described received signal and described signal parameter; And

Quality is estimated and order determines the unit, it uses the mutual interference volume of described estimation and the noise decision order from described received signal detection signal, and estimate when according to the rules detection comes decision signal in proper order, to be used as the quality of benchmark, can think by the detection order than the caused mutual interference volume of the signal of given front smaller or equal to the regulation level, estimate described quality.

10. signal detector according to claim 9 is characterized in that, described noise estimation unit has:

The copy signal generation unit, it generates the copy signal of described received signal according to described received signal and described signal parameter;

Subtracter, it deducts described copy signal from described received signal, and the output residual signal;

The frequency band limits filter, it carries out frequency band limits according to the estimating noise waveform that comprises in the described received signal to described residual signal, is not limited to the signal bandwidth of the described signal that comprises in the described received signal; And

The noise calculation unit, it is at each calculated signals that comprises in the described received signal and export the noise of being removed by described frequency band limits filter.

11. signal detector according to claim 1 is characterized in that, described detection determines the unit to provide high more detection order for the high more signal of communication quality in proper order.

12. signal detector according to claim 1 is characterized in that, also has:

The copy maker, it uses result of determination and the channel estimation value that is generated by described balanced identifying unit, generates the copy of described received signal,

Described signal detector comprises a plurality of levels of Signal Separation, and each grade is defined by described combination by variable passband bandpass filter, described balanced identifying unit and described copy generation unit,

In each level, from described received signal, deduct the described copy signal that generates in prime, and use the residual signal after subtracting each other to carry out frequency band limits, equilibrium and judgement.

13. signal detector according to claim 1 is characterized in that, estimates the described signal parameter of described each signal according to described received signal.

14. signal detector according to claim 1 is characterized in that, obtains the described signal parameter of described each signal in advance from the Wireless Telecom Equipment of transmitter side.

15. receiver, it is the receiver of employed Wireless Telecom Equipment under wireless communications environment, a plurality of Wireless Telecom Equipments utilize different transmission signal bandwidths to communicate mutually in this wireless communications environment, it is characterized in that, described receiver has multi-user detector, and described multi-user detector comprises:

A plurality of frequency band limits filters that have different by frequency band, it is corresponding respectively to be included in a plurality of signals the input signal from what described other Wireless Telecom Equipment sent, and described other Wireless Telecom Equipment has by the different a plurality of sending filters of frequency band;

Channel estimation unit, it uses signal message, and has considered the caused intersymbol interference of receiving terminal filter by described a plurality of sending filters and described receiver, estimates the channel condition information separately of described a plurality of signals;

Minimum-mean square error filters, it uses estimated channel condition information and described signal message, calculating filter coefficient, and the signal that has carried out frequency band limits of association carried out equilibrium;

Soft input and output decoder, it judges each user data item that comprises in the described signal according to described signal message, and calculates the likelihood of each code element that is mapped to signal space;

The copy maker, it is according to described likelihood generated code metasequence copy, and using described sequence of symhols copy and described signal message to generate the received signal copy, described sequence of symhols copy is provided for described minimum-mean square error filters and is used in the equilibrium to the signal after the described frequency band limits; And

Subtracter, it deducts described received signal copy from described input signal.

16. receiver according to claim 15, it is characterized in that, described receiver has multistage Multiuser Detection unit, described multistage Multiuser Detection unit comprises 2 or 2 the above multi-user detectors, and each described multi-user detector uses by the copy signal that described multi-user detector generated of prime and implements input and copy generation.

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