CN100345405C - Method for testing aerrays system in use for multiple inputs and multiple outputs - Google Patents

Abstract

The purpose of the present invention is to provide a low-complexity detection method that can further improve the anti-interference ability for future broadband multiple-input multiple-output (MIMO) antenna array systems. The present invention places the processing of multi-antenna signals in the frequency domain, uses a single-carrier frequency domain equalizer to combat various interferences caused by frequency selective fading; uses a serial interference eliminator and a parallel interference eliminator to eliminate interference between antennas . The technique of integrating Fourier transform and Fourier inverse transform into spreading codes in the present invention can reduce the time delay when performing serial interference elimination. The detection method in the present invention is practical and efficient, and is especially suitable for practical broadband mobile communication systems in the future.

Description

A kind of detection method that is used for multiple-input and multiple-output (MIMO) antenna array system

Technical field

The present invention relates to general data communication, relate in particular to a kind of detection method that is used for multiple-input and multiple-output (MIMO) antenna array system.

Background technology

The message transmission rate that following mobile communication system requires to provide will be up to 100Mbit/s, and the business of support also will expand to multimedia service (comprising real-time streaming media service) from speech business.Can realize on limited frequency spectrum resources that two-forty and jumbo technology have become the focus of present research.Multiple-input and multiple-output (MIMO) technology is the development space resource fully, utilizes the antenna array of base station and terminal to realize that pilosity penetrates receive more, and then can increase under the situation of frequency spectrum resource and antenna transmitting power not needing, and improves channel capacity exponentially.

At present, the various countries scholar has carried out research widely to the detection method of multiple-input and multiple-output (MIMO) system.Yet great majority research at be that channel between each dual-mode antenna is the single user system of flatness fading channel, this wide-band mobile communication system for future is comprehensive inadequately.Following wide-band mobile communication system will face a stern challenge usually: frequency selective fading.So-called frequency selective fading, referring to channel has different declines to sending signal on different frequency, thereby produces the interference between serious intersymbol interference, multiple access interference and antenna.These interference are very big for the performance impact of the system that requires the high s/n ratio level (as mimo system), and in such system, receiver must have good antijamming capability.

The someone proposes to use in multiple-input and multiple-output (MIMO) system OFDM (OFDM) technology to come the decline of contrary frequency selectivity, i.e. MIMO-OFDM system (as Chinese patent 02827793.7 " iterative detection of MIMO-OFDM system and decoding ") in recent years.Multi-carrier OFDM (OFDM) is a kind of parallel transmission technology, and it is divided into system bandwidth N frequency subchannels effectively, and the subcarrier of each subchannel is modulated separately.Symbol period is N a times of same rate single-carrier system, intersymbol sensitiveness of crosstalking reduced greatly than single-carrier system, thus more effectively contrary frequency selectivity decline.The big advantage of another of OFDM is to use the low-down frequency-domain equalizer of complexity that signal is detected.Yet, with respect to single-carrier system, it is high and to shortcomings such as phase noise sensitivities that multi-carrier orthogonal frequency division multiplexing system still exists peak-to-average force ratio, this has the wideer range of linearity with regard to the power amplifier that requires transmitter, require receiver to adopt the littler tuner of phase noise coefficient and other analogue devices simultaneously, thereby increased the cost of whole system.

Single-carrier system is a kind of very ripe transmission system, and current most of mobile communication system all belongs to single-carrier system.The most frequently used method of contrary frequency selectivity decline just is to use the single carrier balancing technique, and it is divided into single carrier wave time domain balancing technique and single-carrier wave frequency domain equalization technology two classes usually.The single carrier wave time domain balancing technique also is a kind of mature technique, possesses very strong antijamming capability.Yet the complexity of single carrier wave time domain equalizer and the maximum delay of channel are extended to cube and increase.Be subjected to the restriction of hardware resource, the single carrier wave time domain equalizer is difficult to be achieved (as mimo system) in some applications.It is another kind of that balancing technique---single-carrier wave frequency domain equalization technology has overcome the shortcoming of single carrier wave time domain balancing technique and orthogonal frequency division multiplexi, has drawn their advantage.Under frequency selective fading channels, received signal is the convolution that sends signal and channel impulse response on time domain, then is the product that sends signal and channel frequency domain response on frequency domain.According to the channel frequency domain response that channel estimating obtains, single carrier frequency domain equalization device part-frequency point carries out equilibrium, thereby computation complexity is reduced widely.In theory, the single carrier frequency domain equalization device is the same with the performance of single carrier wave time domain equalizer, and the complexity of its complexity and ofdm system is suitable.The detection method that is used for multiple-input and multiple-output (MIMO) antenna array system of the present invention has adopted the single carrier frequency domain equalization device to come the caused various interference that declines of contrary frequency selectivity exactly, uses serial interference elimination device and parallel interference canceller to eliminate interference between antenna simultaneously.This detection method not only performance is good, and complexity is also very low.

Summary of the invention

The purpose of this invention is to provide a kind of detection method that can further improve the low complex degree of antijamming capability that is used for following broadband multiple-input and multiple-output (MIMO) antenna array system.

First feature of detection method of the present invention is: on data processing, use the single carrier frequency domain equalization device that the data of multiple transmit antennas are carried out the various interference that separation detection and the decline of contrary frequency selectivity cause.The interference between suppressing antenna simultaneously of single carrier frequency domain equalization device, intersymbol interference, multiple access disturb, thereby have the better resisting interference ability.At first, each channel impulse response of the time-domain signal that receives of all reception antennas and estimation is transformed to frequency-region signal by piece through Fourier transform unit; Then, according to the estimated channel frequency domain response, use the single carrier frequency domain equalization device to carry out the detection of multiple transmit antennas frequency-region signal by frequency; At last time domain is returned in the frequency domain estimated signal process Fourier inversion unit conversion of each transmitting antenna, thereby obtain the estimated signal on the time domain.The single carrier frequency domain equalization device becomes the minor matrix computing of part-frequency point, the low reason of single carrier frequency domain equalization device complexity that Here it is with the large matrix computing of single carrier wave time domain equalizer.The equalizing coefficient of the single carrier frequency domain equalization device of this detection method can use minimum mean square error criterion or Zero Forcing to obtain.The single carrier frequency domain equalization device of this detection method is equally applicable to multiple situations such as transmitting antenna power is unequal, the noise power of reception antenna is unequal and relevant, the data of transmitting antenna are relevant.The single carrier frequency domain equalization device of this detection method can use and insert the cyclicity that Cyclic Prefix technology or zero filling technology or overlapping intercepting technology are eliminated interference among data blocks and structure channel matrix.In the following description, we adopt overlapping intercepting technology.

Second feature of detection method of the present invention is: by adopting Fourier transform and Fourier inversion are dissolved into technology in the spreading code, make and saved many Fourier transform unit and Fourier inversion unit in receiver.This technology combines Fourier transform unit and frequency multiplier exactly becomes a frequency multiplier (spreading code of this frequency multiplier is the Fourier transform of actual spreading code), and Fourier inversion unit and despreader are combined becomes a despreader (spreading code of this despreader also is the Fourier transform of actual spreading code).When carrying out serial interference elimination, can reduce a large amount of time delays like this.

The 3rd feature of detection method of the present invention is: when carrying out each transmitting antenna signal interference eliminated, only eliminate this user's interference.Owing between antenna, used the spreading code reuse technology, so the ground of the serious interference between antenna has influenced the detection effect.Detection method of the present invention uses serial interference elimination device and parallel interference canceller that inter-antenna interference is carried out some effective eliminations, thereby improves system's anti-jamming capacity.Discovering that the interference between antenna mainly comes from this user's interference, also is the interference of same spreading code data.This detection method only rebuild and offset this user's interference, and other users' interference remains in the received signal still when carrying out the elimination of serial interference elimination and parallel interference.These other users' interference can utilize the orthogonality of spreading code effectively to suppress.

The 4th feature of detection method of the present invention is: when carrying out the serial detection, only calculate the equalizing coefficient of a single carrier frequency domain equalization device, only carry out once the noise ordering of all transmitting antennas.In traditional detection method, whenever carry out after serial interference elimination, all need to recomputate equalizing coefficient and again to the noise ordering of residue transmitting antenna.Yet in this detection method, only need the interference except that this user, other users' interference still is present in the received signal.The difference of each like this equalizing coefficient that recomputates is little, moreover the error of noise power estimation in practice also can cause the fluctuation of equalizing coefficient.Therefore this detection method is only calculated equalizing coefficient one time, and this makes the complexity that detects reduce.The noise ordering of only carrying out once all transmitting antennas also is as a same reason.

Based on above 4 features, the present invention proposes a kind of detection method of the low complex degree that can further improve multiple-input and multiple-output (MIMO) antenna array system antijamming capability newly.Each channel impulse response of time-domain signal that all reception antennas receive and estimation at first is transformed to frequency-region signal through Fourier transform unit; According to the frequency domain response of each channel, calculate the equalizing coefficient of frequency-domain equalizer on each frequency by minimum mean square error criterion or Zero Forcing; Calculate signal to noise ratio, and it is carried out descending ordering through each transmitting antenna after the frequency-domain equalizer detection; According to ranking results, on frequency domain, use the single carrier frequency domain equalization device to detect the frequency domain estimated signal of respective transmit antenna successively; Obtain the judgement data of this user through despreader, the decision device that has incorporated Fourier inversion then at this transmitting antenna; After disturbing regeneration, this user's of this transmitting antenna frequency-region signal is eliminated from total reception frequency-region signal, detected the received signal of antenna as the next one by interference eliminator; At last, after all transmitting antennas have detected, with this user dateout as this user after the judgement data of each transmitting antenna are by parallel/serial converter.

Structure according to detection method proposed by the invention, receiver should comprise following major part: Fourier transform unit (101～10P, 2011～20PL), many antennas single carrier frequency domain equalization device (301～30L, 411～41L), incorporate the despreader (311～31L of Fourier inversion, 421～42L), decision device (321～32L, 431～43L), incorporate the frequency multiplier (331～33L) of Fourier transform, channel recovery unit (341～34L), memory (361～36L), interference cancellation device (351～35 (L-1)), parallel interference canceller (401) etc.

The present invention is described in further detail below in conjunction with the drawings and specific embodiments.

Description of drawings

What Fig. 1 described is multi-user's multiple-input and multiple-output (MIMO) antenna array system.

What Fig. 2 described is the principle that incorporates the frequency multiplier of Fourier transform and incorporate the despreader of Fourier inversion.

What Fig. 3 described is the implementation method of single carrier frequency domain equalization device in multiple-input and multiple-output (MIMO) antenna array system.

What Fig. 4 described is the flow chart of embodiments of the invention 1.

What Fig. 5 described is the flow chart of embodiments of the invention 2.

Embodiment

At first the structure of multi-user's multiple-input and multiple-output (MIMO) antenna array system is done some descriptions.Referring to Fig. 1, L transmitting antenna and P reception antenna are arranged in system, wherein P is more than or equal to L.Suppose that each antenna is separate, the channel between the dual-mode antenna is a frequency selective fading channels.At transmitting terminal, each user's high spped coding symbol data streams at first converts the parallel low rate data streams of L row to.There is U user in system, and same user's sub data flow uses identical spreading code to carry out spread spectrum, and the data of different user use different spreading codes to distinguish.Then all users' sub data flow is stacked up and go out from the transmission antennas transmit of correspondence respectively.At receiving terminal, the data of P reception antenna reception are synchronous.

Referring to Fig. 2, what describe among the figure is the principle that incorporates the frequency multiplier of Fourier transform and incorporate the despreader of Fourier inversion.Fourier transform matrix and Fourier inversion matrix can be expressed as respectively:

And F ^-1=F ^H(1)

Spread spectrum matrix and despreading matrix can be expressed as respectively:

With

(2)

Wherein, N represents the symbolic number that process data block comprises, and M represents deal with data block size, i.e. M=NQ; Q is a spreading factor; F is a M dimension square formation, and C is that NQ * N ties up matrix, C ^HFor N * NQ ties up matrix; Symbol [] ^*, [] ^T, [] ^HRepresent conjugation, transposition, conjugate transpose respectively.

Frequency domain chip sequence d after time-domain symbol sequence b process frequency multiplier and the Fourier transform unit can be expressed as:

d＝FCb (3)

Wherein b comprises N symbol.We can be combined into W with matrix F and Matrix C earlier, i.e. W=FC.

Frequency domain chip sequence d can be expressed as:

d＝Wb (4)

W=[W wherein ¹W ²W ^N], W ⁿIt is the Fourier transform of the n column vector of Matrix C.If it is known to have incorporated the spread spectrum matrix W of Fourier transform, frequency domain chip sequence d can directly use W that time-domain symbol sequence b is carried out spread spectrum and obtain, thereby has saved Fourier transform unit.In like manner, the time-domain symbol sequence b behind frequency domain chip sequence d process Fourier inversion unit and the despreader can be expressed as:

b＝C ^HF ^Hd＝(FC) ^Hd＝W ^Hd (5)

Same known if incorporated the spread spectrum matrix W of Fourier transform, time-domain symbol sequence b can directly use W that frequency domain chip sequence d is carried out despreading and obtain, thereby has saved the Fourier inversion unit.In adopting the Cyclic Prefix technological system, spread spectrum matrix and despreading matrix are as the formula (2).And in the system that adopts overlapping intercepting technology, the length M=J+2S of process data block.Wherein, J is nonoverlapping chip number in the data block, S be current process data block respectively with the overlapping chip number of former and later two data blocks.Because overlapping intercepting technology will abandon 2S the chip that detects data block edge, back, only J chip to data block carries out despreading, so spread spectrum matrix and despreading matrix can be expressed as:

Wherein, C ' is (NQ+2S) * N dimension matrix, (C ') ^HBe the dimension of N * (NQ+2S) matrix, J=NQ.So, in overlapping intercepting technology, incorporated the spread spectrum matrix W=FC ' of Fourier transform, incorporated the despreading matrix W of Fourier inversion ^H=(FC ') ^HFor simplicity, symbol numbers N generally gets 1.

Referring to Fig. 3, what describe among the figure is the implementation method of single carrier frequency domain equalization device in multiple-input and multiple-output (MIMO) antenna array system.At first, each channel impulse response process Fourier transform unit of time-domain signal that all reception antennas receive and estimation (101～10P, 2011～20PL) are transformed to frequency-region signal:

r _k＝[r _k(1)r _k(2)…r _k(M)] ^T，h _k，i＝[h _k，i(1)…h _k，i(V)0…0] ^T (7)

R _k＝FFT _(M)[r _k]，R _k＝[R _k(1)?R _k(2)?…?R _k(M)] ^T (8)

H _k，i＝[H _k，i(1)?H _k，i(2)?…?H _k，i(M)] ^T (9)

k＝1，…，P i＝1，…，L m＝1，…，M (10)

FFT wherein _(M)[] expression is carried out the fast Fourier transform on M rank, r to vector _kThe signal vector of representing k root reception antenna, h _{K, i}The channel impulse response of expression from the i transmit antennas to k root reception antenna, V represents channel impulse response length.All frequency-region signal part-frequency points reconfigure and are (function that Unit 110,220 are realized):

R(m)＝[R ₁(m?)R ₂(m)?…?R _P(m)] ^T，

m＝1，…，M

(11)

Many antennas single carrier frequency domain equalization device equalizing coefficient can be expressed as (function that Unit 220 are realized):

Have according to Zero Forcing:

$G_{\mathrm{ZF}}\left(m\right)={\{H{\left(m\right)}^H\×R_N^{-1}\left(m\right)\×H\left(m\right)\}}^{-1}H{\left(m\right)}^H\×R_N^{-1}\left(m\right)$

m＝1，…，M

(12)

Have according to minimum mean square error criterion:

$G_{\mathrm{MMSE}}\left(m\right)={\{H{\left(m\right)}^H\×R_N^{-1}\left(m\right)\×H\left(m\right)+R_D^{-1}\left(m\right)\}}^{-1}H{\left(m\right)}^H\×R_N^{-1}\left(m\right)$

m＝1，…，M

(13)

R wherein _D(m)=E{D (m) * D (m) ^H, R _N(m)=E{N (m) * N (m) ^H, D (m) is the vector that all transmitting antennas are formed at the frequency-region signal of m frequency, N (m) is the vector that the noise of all reception antennas is formed at the frequency-region signal of m frequency.This algorithm is equally applicable to multiple situations such as transmitting antenna power is unequal, the noise power of reception antenna is unequal and relevant, the data of transmitting antenna are relevant.G (m) (expression G _ZF(m) or G _MMSE(m)) the capable correspondence of i be the frequency domain equalization coefficient of i transmitting antenna at m frequency.The frequency domain estimated signal of i transmitting antenna can be expressed as (function that 301～30L unit is realized):

${\tilde{D}}_i\left(m\right)=G_i\left(m\right)\×R\left(m\right),m=1,\·\·\·,M---\left(14\right)$

G wherein _i(m) be that the i of G (m) is capable.As can be seen, single carrier frequency domain equalization device part-frequency point carries out separation detection to the multiple transmit antennas frequency-region signal.With the frequency domain estimated signal of each transmitting antenna through the despreader that incorporating Fourier transform (311～31L) are transformed into time-domain signal, pass through again decision device (321～32L), just obtain the decision signal of this user at each transmitting antenna.

The average signal-to-noise ratio (SNR/SINR) that detects each transmitting antenna of back through frequency-domain equalizer can be expressed as:

${\mathrm{SNR}\left(i\right)}_{\mathrm{for\; ZF}}=\frac{1}{M}\underset{m=1}{\overset{M}{\mathrm{\Σ}}}\frac{{\left[R_D\left(m\right)\right]}_{i,j}}{{[G_{\mathrm{ZF}}\left(m\right)\×R_N\left(m\right)\×G_{\mathrm{ZF}}{\left(m\right)}^H]}_{i,j}}---\left(15\right)$

${\mathrm{SINR}\left(i\right)}_{\mathrm{for\; MMSE}}=\frac{1}{M}\underset{m=1}{\overset{M}{\mathrm{\Σ}}}\frac{{\left[R_D\left(m\right)\right]}_{i,j}\×{\left|{\left[Z\left(m\right)\right]}_{i,j}\right|}^2}{{[Z\left(m\right)\×R_D\left(m\right)]}_{i,j}-2\mathrm{Re}\{{[Z\left(m\right)\×R_D\left(m\right)]}_{i,j}\×{\left[Z{\left(m\right)}^H\right]}_{i,j}\}+{\left[R_D\left(m\right)\right]}_{i,j}\×{\left|{Z\left(m\right)]}_{i,j}\right|}^2}---\left(16\right)$

When satisfying R _D(m)=I, $R_N\left(m\right)={\mathrm{\σ}}_n^{2}I$ The time, can be reduced to:

${\mathrm{SNR}\left(i\right)}_{\mathrm{for\; ZF}}=\frac{1}{M}\underset{m=1}{\overset{\mathrm{<figure-callout\; id="1"\; label="M"\; filenames="C20051008010000161.png,C20051008010000171.png"\; state="\{\{state\}\}">M</figure-callout>}}{\mathrm{\&Sigma;}}}\frac{1}{{\mathrm{\&sigma;}}_n^2{\left[{\left(H{\left(m\right)}^{H}H\left(m\right)\right)}^{-1}\right]}_{i,j}}---\left(18\right)$

${\mathrm{SINR}\left(i\right)}_{\mathrm{for\; MMSE}}=\frac{1}{M}\underset{m=1}{\overset{M}{\mathrm{\&Sigma;}}}\frac{{[G_{\mathrm{MMSE}}\left(m\right)\&times;H\left(m\right)]}_{i,j}}{1-{[G_{\mathrm{MMSE}}\left(m\right)\&times;H\left(m\right)]}_{i,j}}---\left(18\right)$

Wherein [] _{I, i}The capable i row of the i of representing matrix, || the mould of expression plural number, I representation unit matrix.

Referring to Fig. 4, what describe among the figure is the structure chart of embodiments of the invention 1.The receiver that uses this detection method by Fourier transform unit (101～10P, 2011～20PL), many antennas single carrier frequency domain equalization device (301～30L), incorporate Fourier inversion despreader (311～31L), decision device (321～32L), incorporate frequency multiplier (331～33 (L-1), channel recovery unit (341～34 (L-1)), interference cancellation device (351～35 (L-1)), the parallel/serial converter compositions such as (441) of Fourier transform.Its flow process can be expressed as:

1) each channel impulse response of the time-domain signal that receives of all reception antennas and estimation at first pass through Fourier transform unit (101～10P, 2011～20PL) are transformed to frequency-region signal;

2), calculate the equalizing coefficient (function that Unit 220 realize) of frequency-domain equalizer on each frequency of all transmitting antennas according to the frequency domain response of each channel;

3) calculate the average signal-to-noise ratio (SNR/SINR) that detects each transmitting antenna of back through frequency-domain equalizer, and it is carried out descending ordering (function that Unit 230 are realized);

4) use frequency-domain equalizer that the transmitting antenna of signal to noise ratio maximum is disturbed inhibition and detects the frequency domain estimated signal (function that Unit 301 are realized) that obtains this transmitting antenna;

5) the frequency domain estimated signal of this transmitting antenna that detection is obtained obtains this user's judgement data after through the despreader (311), decision device (321) that incorporate Fourier inversion;

6) these judgement data one tunnel are as output, and the frequency multiplier (331) that other one tunnel process incorporates Fourier transform is transformed to frequency-region signal.In channel recovery unit (341), the channel frequency domain response that frequency-region signal is corresponding with this transmitting antenna (being the corresponding column vector of this transmitting antenna among formula (11) H (m)) is carried out complex multiplication by frequency, reconstructs this user's of this transmitting antenna interference on frequency domain;

7) this interference and the frequency-region signal that receives are offseted (function that Unit 351 are realized), thereby reduced the suffered interference of residue transmitting antenna;

8) repeating step 4 detects to step 7 pair next signal to noise ratio time big transmitting antenna, detects until all transmitting antennas to finish;

9) the judgement data of all transmitting antennas are passed through parallel/serial converter (441), export this user's data;

Referring to Fig. 5, what describe among the figure is the structure chart of embodiments of the invention 2.The receiver that uses this detection method is by Fourier transform unit (101～10P, 2011～20PL), many antennas single carrier frequency domain equalization device (301～30L, 411～41L), incorporate the despreader (311～31L of Fourier inversion, 421～42L), decision device (321～32L, 431～43L), incorporate Fourier transform frequency multiplier (331～33L), the channel recovery unit (341～34L), memory (361～36L), interference cancellation device (351～35 (L-1)), parallel interference canceller (401), parallel/serial converter compositions such as (441).Its flow process can be expressed as:

1) each channel impulse response of the time-domain signal that receives of all reception antennas and estimation at first pass through Fourier transform unit (101～10P, 2011～20PL) are transformed to frequency-region signal;

2), calculate the equalizing coefficient (function that Unit 220 realize) of frequency-domain equalizer on each frequency of all transmitting antennas according to the frequency domain response of each channel;

3) calculate the average signal-to-noise ratio (SNR/SINR) that detects each transmitting antenna of back through frequency-domain equalizer, and it is carried out descending ordering (function that Unit 230 are realized);

4) use frequency-domain equalizer that the transmitting antenna of signal to noise ratio maximum is disturbed inhibition and detects the frequency domain estimated signal (function that Unit 301 are realized) that obtains this transmitting antenna;

5) the frequency domain estimated signal of this transmitting antenna that detection is obtained reconstructs this user's of this transmitting antenna interference through after incorporating despreader (311), the decision device (321) of Fourier inversion, the frequency multiplier (331) that incorporates Fourier transform, channel recovery unit (341) on frequency domain;

6) interference one tunnel of this reconstruction is left with memory (361), other one the tunnel carries out interference cancellation (function that Unit 351 are realized) with received signal, thereby reduces to remain the suffered interference of transmitting antenna;

7) repeating step 4 detects to step 6 pair next signal to noise ratio time big transmitting antenna, detects until all transmitting antennas to finish;

8) after the reconstruction that obtains all these users of transmitting antenna is disturbed, to carry out once simple parallel interference again and eliminate (function that Unit 401 are realized), the interference that is about to all these users of transmitting antenna except that this antenna eliminates from received signal;

9) and then use the single carrier frequency domain equalization device (411～41L) detect the frequency domain estimated signal of each transmitting antenna concurrently;

10) the frequency domain estimated signal of each transmitting antenna that detection is obtained concurrently through having incorporated Fourier inversion despreader (421～42L), decision device (431～43L), obtain the judgement data of this user at each transmitting antenna;

11) the judgement data of all transmitting antennas are passed through parallel/serial converter (441), export this user's data;

Emulation experiment shows that the present invention can further reduce the computation complexity of wireless communication system, and can improve systematic function, reduces and detects time delay.In addition, the present invention's (if adopting overlapping intercepting technology) can directly apply in the present single-carrier system, does not need air interface is made amendment.

In a word, the present invention is a kind of detection method efficiently that is applicable to the practicality of following broadband multiple-input and multiple-output (MIMO) antenna array system.

Claims (4)

1. a detection method that is used for the multi-input/output antenna array system is characterized in that, implementation step is:

1) each channel impulse response of the time-domain signal that receives of all reception antennas and estimation at first pass through Fourier transform unit (101～10P, 2011～20PL) are transformed to frequency-region signal;

2), calculate the equalizing coefficient of frequency-domain equalizer on each frequency of all transmitting antennas according to the frequency domain response of each channel;

3) calculate the average signal-to-noise ratio that detects each transmitting antenna of back through frequency-domain equalizer, and it is carried out descending ordering;

4) use frequency-domain equalizer that the transmitting antenna of signal to noise ratio maximum is disturbed inhibition and detects the frequency domain estimated signal that obtains this transmitting antenna;

5) the frequency domain estimated signal of this transmitting antenna that detection is obtained obtains this user's judgement data after through the despreader (311), decision device (321) that incorporate Fourier inversion;

6) these judgement data one tunnel are as output, the frequency multiplier (331) that other one tunnel process incorporates Fourier transform is transformed to frequency-region signal, in channel recovery unit (341), the channel frequency domain response that frequency-region signal is corresponding with this transmitting antenna is carried out complex multiplication by frequency, reconstructs this user's of this transmitting antenna interference on frequency domain;

7) this interference and the frequency-region signal that receives are offseted, thereby reduced the suffered interference of residue transmitting antenna;

8) repeating step 4 detects to step 7 pair next signal to noise ratio time big transmitting antenna, detects until all transmitting antennas to finish;

9) the judgement data of all transmitting antennas are passed through parallel/serial converter (441), export this user's data.

2. the detection method that is used for the multi-input/output antenna array system described in claim 1 is characterized in that, in carrying out each transmitting antenna interference eliminated, only offsets this user's interference.

3. the detection method that is used for the multi-input/output antenna array system described in claim 1 is characterized in that, only carries out the calculating of a single carrier frequency domain equalization device equalizing coefficient and only carries out once the noise ordering of all transmitting antennas.

4. a detection method that is used for the multi-input/output antenna array system is characterized in that, implementation step is:

1) each channel impulse response of the time-domain signal that receives of all reception antennas and estimation at first pass through Fourier transform unit (101～10P, 2011～20PL) are transformed to frequency-region signal;

2), calculate the equalizing coefficient of frequency-domain equalizer on each frequency of all transmitting antennas according to the frequency domain response of each channel;

3) calculate the average signal-to-noise ratio that detects each transmitting antenna of back through frequency-domain equalizer, and it is carried out descending ordering;

4) use frequency-domain equalizer that the transmitting antenna of signal to noise ratio maximum is disturbed inhibition and detects the frequency domain estimated signal that obtains this transmitting antenna;

5) the frequency domain estimated signal of this transmitting antenna that detection is obtained reconstructs this user's of this transmitting antenna interference through after incorporating despreader (311), the decision device (321) of Fourier inversion, the frequency multiplier (331) that incorporates Fourier transform, channel recovery unit (341) on frequency domain;

6) interference one tunnel of this reconstruction is left with memory (361), other one the tunnel carries out interference cancellation with received signal, thereby reduces to remain the suffered interference of transmitting antenna;

7) repeating step 4 detects to step 6 pair next signal to noise ratio time big transmitting antenna, detects until all transmitting antennas to finish;

8) after the reconstruction that obtains all these users of transmitting antenna is disturbed, to carry out once simple parallel interference again and eliminate, the interference that is about to all these users of transmitting antenna except that this antenna eliminates from received signal;

9) and then use the single carrier frequency domain equalization device (411～41L) detect the frequency domain estimated signal of each transmitting antenna concurrently;

10) the frequency domain estimated signal of each transmitting antenna that detection is obtained concurrently through having incorporated Fourier inversion despreader (421～42L), decision device (431～43L), obtain the judgement data of this user at each transmitting antenna;

11) the judgement data of all transmitting antennas are passed through parallel/serial converter (441), export this user's data.

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