CN103684563A - Iteration multi-antenna transmission method and device under pinhole channel environment - Google Patents

Iteration multi-antenna transmission method and device under pinhole channel environment Download PDF

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CN103684563A
CN103684563A CN201310661557.5A CN201310661557A CN103684563A CN 103684563 A CN103684563 A CN 103684563A CN 201310661557 A CN201310661557 A CN 201310661557A CN 103684563 A CN103684563 A CN 103684563A
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signal
antenna
iteration
user
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CN103684563B (en
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李亦凡
沈伟杰
周小林
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Fudan University
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Fudan University
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Abstract

The invention belongs to the technical field of wireless communications and particularly relates to an iteration multi-antenna transmission method and device under a pinhole channel environment. Information of the same user is interleaved to different antennae through different interleavers. The method includes the coding and transmitting process and the iteration, checking and receiving process. The iteration multi-antenna transmission method and device under the pinhole channel environment have the advantages that by means of the IDM multi-antenna method, the transmission performance of an MIMO system under the pinhole channel environment is effectively improved, and accuracy is improved; because a decision device and a decoder in a receiving module are separated from each other, the complexity of the device is reduced and the device is simplified on the premise that performance is guaranteed; the specific decision device ESE can be further applied to high-order modulation systems like a QAM system, and therefore the system can still be applied to an environment with a high requirement for data processing speed.

Description

Iteration multi-antenna transmission method and device in a kind of pinhole channel
Technical field
The invention belongs to wireless communication technology field, be specifically related to a kind of for the many antenna modulation reception transmission method of the IDM in pinhole channel environment and device.
Background technology
Multi-emitting receives (Multi-Input Multi-Output, MIMO) system more and is comprised of a plurality of transmitting antennas and reception antenna.Compare with traditional single transmit, the communication system of single reception antenna, can, in the situation that not increasing signal to noise ratio, expand bandwidth, reduce the error rate, improving performance.
Pinhole channel refers to the transmission channel that has pin hole scattering effect, is generally used for and represents extra long distance communication channel or indoor multiple scattering environment.In indoor communications demand, there is certain researching value ever-increasing today.Meanwhile, because the performance of mimo system under pinhole channel is far away from conventional channel environment, necessary for the mimo system research under pinhole channel environment.
Interlacing multi-address modulation (Interleave Division Modulation, IDM) technology is utilized different interleavers to interweave a user coded sequence and is modulated on different antennas, with the signal quality of elevator system, reduces the error rate.
The present invention is mainly for affecting IDM multi-aerial transmission system under pinhole channel and the performance boost of traditional mimo system.
Summary of the invention
In order to overcome the deficiencies in the prior art, the object of the invention is to propose iteration multi-antenna transmission method and the device in a kind of pinhole channel.Its device is simple, and its method has effectively promoted the transmission performance of mimo system under pinhole channel, and has promoted accuracy.
In the present invention, due to the pin hole effect existing in pinhole channel, the diversity of mimo system and capacity are all different from general conventional mimo channel.In order to describe pinhole channel, the general pair Ruilis decline model description channels that use.Formula is as follows:
For
Figure 756083DEST_PATH_IMAGE001
during antenna configuration, the envelope pattern of its channel as shown in Figure 1, wherein
Figure 972301DEST_PATH_IMAGE002
correspond respectively to number of transmission antennas, pin hole quantity and reception antenna quantity.When all transmission antennas transmit signals are identical, on receiving terminal antenna, the summation of all gained signals meets the probability distribution in figure.
For
Figure 917123DEST_PATH_IMAGE001
pinhole channel,
Figure 269607DEST_PATH_IMAGE003
the signal that individual receiving terminal antenna place receives can be expressed as:
Figure 274472DEST_PATH_IMAGE004
Wherein
Figure 712407DEST_PATH_IMAGE005
be respectively by transmitting terminal antenna to pin hole with have pin hole to the channel matrix of receiving terminal antenna.
Figure 133024DEST_PATH_IMAGE006
represent that chip is long a frame in corresponding bit sequence.
Figure 515781DEST_PATH_IMAGE008
represent
Figure 441011DEST_PATH_IMAGE009
the propagation coefficient of individual pin hole place signal.
Figure 727636DEST_PATH_IMAGE010
represent the power that n transmitting antenna place transmits. the noise that represents receiver.So, for whole system,
Figure 339063DEST_PATH_IMAGE012
the total reception signal matrix of individual reception antenna is:
Figure 813907DEST_PATH_IMAGE013
In formula
Figure 576327DEST_PATH_IMAGE014
be respectively
Figure 757909DEST_PATH_IMAGE015
dimension matrix,
Figure 275478DEST_PATH_IMAGE016
(j) be
Figure 175301DEST_PATH_IMAGE017
dimension square formation, s (j) is l the propagation coefficient vector that pin hole is corresponding,
Figure 741412DEST_PATH_IMAGE018
be dimensional vector, be
Figure 918337DEST_PATH_IMAGE020
dimensional vector;
Figure 22559DEST_PATH_IMAGE021
the summation that represents noise.The fading envelope of having shown different pin hole configurations in Fig. 1.
Figure 178734DEST_PATH_IMAGE016
(j) represent the signal propagation coefficient of pin hole, pin hole place transmits and receives transmitting letter with pin hole place to receiving terminal
Number ratio, generally can be divided into three kinds of situations:
1) all pin hole propagation coefficients are identical
Figure 38105DEST_PATH_IMAGE022
2) all pin hole propagation coefficients are independent
Figure 646941DEST_PATH_IMAGE023
3) each pin hole can have influence on other pin holes
In general pinhole channel environment, each pin hole independently exists, the interference between not existing mutually.For multiaerial system, each antenna can independent transmission signal, and coupling can not occur outside channel.So for IDM multiaerial system of the present invention, select independently model description pin hole effect of each pin hole propagation coefficient.
The invention provides the iteration multi-antenna transmission method in a kind of pinhole channel, it utilizes different interleavers to interweave to different antennas same user's information, and it comprises that multi-antenna signal transmitting and iteration check receive two steps.
(1) multi-antenna signal transmitting
First, raw information need to be encoded, use repetition spreading code to encode herein.If simultaneously now
Have
Figure 893432DEST_PATH_IMAGE025
individual user's concurrent multiplexing, wherein individual user's input data are .Will input data use encoder
Figure 596629DEST_PATH_IMAGE029
carry out spread spectrum repeated encoding and generate coded data
Figure 735486DEST_PATH_IMAGE030
, ,
Figure 630947DEST_PATH_IMAGE032
represent spread spectrum number of times, the Data duplication that is about to 1 data length becomes the data of N data length; As
Figure 616220DEST_PATH_IMAGE033
deng.
Secondly, be modulated on different antennas after utilizing different interleavers to interweave to sequence after encoding.If
For code signal
Figure 988296DEST_PATH_IMAGE034
altogether
Figure 59020DEST_PATH_IMAGE017
there is the interleaver that group is different
Figure 112427DEST_PATH_IMAGE035
, work as
Figure 14523DEST_PATH_IMAGE034
pass through interleaver
Figure 495183DEST_PATH_IMAGE036
after, generate
Figure 787624DEST_PATH_IMAGE009
transmitting sequence on antenna
Figure 704109DEST_PATH_IMAGE037
for that with certain random sequence, carries out rearranges,
Figure 49957DEST_PATH_IMAGE032
for data length.
Finally, by different user, the transmitting merging on each antenna is launched.
(2) iteration check receives
First, to the multiple signals that receive, at each reception antenna, utilize ESE independently to adjudicate, draw initial estimation signal.To root antenna, obtains receiving Signal estimation value
Figure 552799DEST_PATH_IMAGE038
.
Secondly, will be from different antennae, the information that belongs to same group of user utilizes cumulative mean to merge, and obtains user's transmission information estimator value.For user
Figure 163909DEST_PATH_IMAGE026
, the transmission information estimator value obtaining is
Figure 251951DEST_PATH_IMAGE039
.This estimated value is utilized to the transmission coding estimated value that interleaver deinterleaving corresponding to this user must this user, to user be .
Then, utilize the decoder that repetition spreading code is corresponding to carry out decoding to sending coding estimated value, obtain the estimated value of original transmitted information, for user
Figure 183501DEST_PATH_IMAGE026
, for .
Follow again, will
Figure 993511DEST_PATH_IMAGE041
return to decoder, after it is encoded, obtain the estimated value of coding data sequences
Figure 996102DEST_PATH_IMAGE042
, and utilize user
Figure 519487DEST_PATH_IMAGE026
after corresponding interleaver interweaves, obtain the estimated value of transmission of data sequences
Figure 746069DEST_PATH_IMAGE043
, return it to the priori conditions as next iteration in decision device ESE and input;
Finally, repeat above-mentioned steps, carry out iteration.Depending on signal length and number of users, carry out, after the iteration of 8 to 16 times, obtaining the estimated value of signal
Figure 987695DEST_PATH_IMAGE041
, now
Figure 528398DEST_PATH_IMAGE041
be final result.
Shown in above, the
Figure 968606DEST_PATH_IMAGE003
the signal that individual receiving terminal antenna place receives can be expressed as:
Figure 569352DEST_PATH_IMAGE044
Can be from belonging to same user by all receiving signal decomposition one-tenth
Figure 32694DEST_PATH_IMAGE026
useful information and other all interference of antenna transmission
Figure 439405DEST_PATH_IMAGE045
the addition of summation:
Figure 443450DEST_PATH_IMAGE047
When number of users, antenna amount, pin hole quantity cause more greatly interference signal quantity to be increased to a certain degree, according to central-limit theorem, can be similar to and think obey
Figure 607419DEST_PATH_IMAGE049
gaussian Profile wherein,
Figure 959903DEST_PATH_IMAGE050
represent interference signal
Figure 699189DEST_PATH_IMAGE048
average,
Figure 324075DEST_PATH_IMAGE051
represent interference signal
Figure 10271DEST_PATH_IMAGE048
variance.
Figure 279578DEST_PATH_IMAGE048
probability density function can be expressed from the next:
Figure 393028DEST_PATH_IMAGE052
When using AWGN model description receiver noise
Figure 318258DEST_PATH_IMAGE011
time, its average
Figure 604883DEST_PATH_IMAGE053
be 0, variance
Figure 931959DEST_PATH_IMAGE054
for
Figure 278627DEST_PATH_IMAGE055
.Therefore,
Figure 425575DEST_PATH_IMAGE048
average
Figure 453573DEST_PATH_IMAGE050
just can represent with following formula:
Figure 173233DEST_PATH_IMAGE048
variance
Figure 73056DEST_PATH_IMAGE051
just can represent with following formula:
Figure 701483DEST_PATH_IMAGE057
Wherein
Figure 737572DEST_PATH_IMAGE058
the the average of individual user's corresponding data, the
Figure 917384DEST_PATH_IMAGE009
the variance of individual user's corresponding data.Wherein
Figure 73559DEST_PATH_IMAGE060
,
Figure 932930DEST_PATH_IMAGE061
information will be upgraded in following iterative process, during first iteration, be initialized as respectively 0 and 1.
In order to adjudicate, receive transmitted signal corresponding to signal, we carry out log-likelihood ratio judgement to the received signal, for BPSK modulation:
Wherein ,
Figure 522678DEST_PATH_IMAGE064
, represent respectively the Output rusults of decision device ESE and decoder DEC.
For BPSK modulation, transmitted signal
Figure 490634DEST_PATH_IMAGE065
for+1 or-1, when transmitted signal is+1:
Figure 586766DEST_PATH_IMAGE066
For formulating channel, channel fading coefficient
Figure 360687DEST_PATH_IMAGE067
, with transmitting power
Figure 630311DEST_PATH_IMAGE069
known.Due to above-mentioned demonstration
Figure 10477DEST_PATH_IMAGE048
gaussian distributed, so
Figure 525772DEST_PATH_IMAGE070
also meet Gaussian Profile, its average and variance are respectively:
Figure 883121DEST_PATH_IMAGE072
In like manner known, when transmitting for-1 time, the average and the variance that receive signal are respectively:
Figure 688266DEST_PATH_IMAGE073
Figure 741672DEST_PATH_IMAGE072
So, decision device output
Figure 646699DEST_PATH_IMAGE074
can be expressed as:
Shown in the same figure decoder architecture, each antenna is by process judgement signal thereafter
Figure 685379DEST_PATH_IMAGE074
use corresponding interleaver deinterleaving to obtain
Figure 339214DEST_PATH_IMAGE076
.After the de-interleaved signal that belongs to same group of user is weighted on average, sends into DEC decoder module and carry out decoding.After decoding, the estimated value of transmitted signal will be obtained
Figure 299080DEST_PATH_IMAGE041
.Meanwhile, by the symbol probability of the information of transmission
Figure 12958DEST_PATH_IMAGE077
as feedback information, send decision device back to and carry out next iteration judgement.Wherein,
Figure 792695DEST_PATH_IMAGE078
Figure 187905DEST_PATH_IMAGE079
In estimation, receive noise average
Figure 887056DEST_PATH_IMAGE050
and variance
Figure 154090DEST_PATH_IMAGE080
in process, need to utilize to transmit
Figure 415307DEST_PATH_IMAGE065
average and variance , these information can be passed through above-mentioned calculate.For BPSK modulation, average
Figure 896786DEST_PATH_IMAGE083
:
Figure 420172DEST_PATH_IMAGE084
Figure 646754DEST_PATH_IMAGE082
for:
Finally, utilize transmitting of calculating average and variance , upgrade and receive noise
Figure 992766DEST_PATH_IMAGE048
average
Figure 337159DEST_PATH_IMAGE050
and variance
Figure 569558DEST_PATH_IMAGE080
, and further upgrade court verdict with
Figure 403521DEST_PATH_IMAGE074
with sending probability
Figure 416477DEST_PATH_IMAGE077
, and repeat above-mentioned steps.
The present invention also provides the conveying device of the iteration multi-antenna transmitting in a kind of pinhole channel, comprises transmitter and receiver, Figure 2 shows that the transmitter architecture based on non-Gray code IDMA high order modulation; Figure 3 shows that the multi-aerial receiver model based on iteration IDM; Wherein comprise wherein
Figure 298982DEST_PATH_IMAGE012
root reception antenna and
Figure 651466DEST_PATH_IMAGE025
individual DEC decoder.Wherein user 1 information is represented by solid line, and another organizes different user
Figure 656331DEST_PATH_IMAGE026
information be illustrated by the broken lines.Wherein
Figure 94266DEST_PATH_IMAGE086
,
Figure 780462DEST_PATH_IMAGE087
represent to belong to respectively user
Figure 49769DEST_PATH_IMAGE026
all interleavers and corresponding deinterleaver.
In the present invention, transmitter comprises encoder, independent random interleaver and the multiple transmit antennas corresponding with transmitting antenna
In the present invention, receiver comprises multiple receive antenna, independently ESE decision device carries out symbol judgement and the DEC decoder corresponding with user.
Described each reception antenna is used independently interleaver to adjudicate, and to using the information of the interleaver that belongs to same user to merge decoding; Receive each antenna end of signal and use after independently ESE decision device is estimated, merge and send into DEC decoder and carry out signal interpretation and probability statistics, and utilize the transmission informational probability of estimating to carry out iteration renewal, the final effective estimation obtaining to received signal;
Described ESE decision device, utilizes the signal receiving and the prior probability that sends symbol, the estimated value of the chip that derivation receives;
Described DEC decoder, utilizes the value of adding up the transmitted signal obtaining, and prediction sends the priori value of symbol, and upgrades with this average that receives interference signal in signal
Figure 163219DEST_PATH_IMAGE050
and variance
Figure 88450DEST_PATH_IMAGE051
prediction, carry out iteration.
Beneficial effect of the present invention is:
(1) utilize the method for the many antennas of IDM, effectively promoted the transmission performance of mimo system under pinhole channel, promoted accuracy.
(2) in receiver module, decision device and decoder are separated, when taking into account performance, reduced the complexity of device, simplified device.
(3) providing ESE can further extend in the High Order Modulation System such as QAM, makes native system require under high environment still applicable in data processing rate.
Accompanying drawing explanation
The fading envelope of the pinhole channel of the different configurations of Fig. 1.
Fig. 2 is IDMA high order modulation transmitter architecture.
Fig. 3 is IDMA high order modulation receiver structure.
Fig. 4 is the performance comparison of native system and a single aerial system.
Fig. 5 is the impact of iterations on native system performance.
Embodiment
What the present invention was proposed is a kind of for the many antenna modulation of the IDM in pinhole channel environment reception transmission means: by coded excitation and iteration check, receive two parts and form, specific implementation process is as follows:
1.as shown in Figure 2, first, for
Figure 375074DEST_PATH_IMAGE026
individual user's input data are
Figure 702151DEST_PATH_IMAGE027
, use encoder
Figure 720922DEST_PATH_IMAGE029
carry out spread spectrum repeated encoding and generate coded data ,
Figure 223765DEST_PATH_IMAGE031
,
Figure 405347DEST_PATH_IMAGE032
represent spread spectrum number of times.As
Figure 860599DEST_PATH_IMAGE088
deng.
Secondly, be modulated on different antennas after utilizing different interleavers to interweave to sequence after encoding.If for code signal altogether
Figure 123271DEST_PATH_IMAGE017
there is the interleaver that group is different
Figure 424939DEST_PATH_IMAGE035
, work as
Figure 116339DEST_PATH_IMAGE034
pass through interleaver
Figure 237879DEST_PATH_IMAGE036
after, generate
Figure 607680DEST_PATH_IMAGE009
transmitting sequence on antenna
Figure 826172DEST_PATH_IMAGE037
for
Figure 623227DEST_PATH_IMAGE034
that with certain random sequence, carries out rearranges,
Figure 232062DEST_PATH_IMAGE032
for data length.
Finally, by different user, the transmitting merging on each antenna is launched.
As shown in Figure 3,
Figure 202292DEST_PATH_IMAGE003
the signal that root reception antenna receives is
Figure 275291DEST_PATH_IMAGE089
.
First, to receiving checkout terminal, carry out initialization:
Figure 243247DEST_PATH_IMAGE090
Secondly, utilize following algorithm to carry out successively iteration verification:
Figure 339379DEST_PATH_IMAGE091
Figure 113300DEST_PATH_IMAGE092
Figure 978487DEST_PATH_IMAGE093
Figure 117345DEST_PATH_IMAGE094
Figure 763090DEST_PATH_IMAGE095
Figure 278385DEST_PATH_IMAGE079
Wherein:
Figure 998079DEST_PATH_IMAGE096
the symbol probability that represents transmission information;
Figure 370155DEST_PATH_IMAGE058
the
Figure 440879DEST_PATH_IMAGE009
the average of individual user's corresponding data;
Figure 494285DEST_PATH_IMAGE059
the
Figure 396382DEST_PATH_IMAGE009
the variance of individual user's corresponding data;
Figure 877042DEST_PATH_IMAGE050
represent interference signal
Figure 435062DEST_PATH_IMAGE048
average,
Figure 85968DEST_PATH_IMAGE051
represent interference signal
Figure 780255DEST_PATH_IMAGE048
variance, the power that represents n transmitting antenna signal;
Figure 539449DEST_PATH_IMAGE008
represent
Figure 934658DEST_PATH_IMAGE009
the propagation coefficient of individual pin hole place signal; be respectively by transmitting terminal antenna to pin hole with have pin hole to the channel matrix of receiving terminal antenna;
Figure 571493DEST_PATH_IMAGE098
the transmission coding estimated value that represents this user;
Figure 900843DEST_PATH_IMAGE099
represent propagation coefficient matrix between individual pin hole;
Figure 768622DEST_PATH_IMAGE100
(s (j)=+ 1) represents the probability that the estimated value of original transmitted signal is+1;
Figure 824303DEST_PATH_IMAGE101
the thermal noise variance that represents receiver, shows with white Gauss noise form.
Last after having carried out the iteration of certain number of times, obtain the estimated value of signal
Figure 578632DEST_PATH_IMAGE041
,
Figure 315644DEST_PATH_IMAGE041
be final result.
In environment in 16QAM, the structure of transmitter and receiver is constant, only need when modulation, use 16QAM to modulate, and use corresponding ESE decision device to adjudicate.The derivation of its ESE below:
Figure 901346DEST_PATH_IMAGE102
Wherein
Figure 331190DEST_PATH_IMAGE103
expression is according to Bayes' theorem:
Wherein,
Figure 910256DEST_PATH_IMAGE003
represent that all corresponding positions are
Figure 553727DEST_PATH_IMAGE105
modulation signal combination, under QPSK modulation,
Figure 888894DEST_PATH_IMAGE106
,
Figure 680132DEST_PATH_IMAGE107
.
Can obtain:
Wherein the signal probability that expression is added up by DEC.
Simulation result: provided under BPSK modulation the performance comparison of a single aerial system and multiaerial system in Fig. 4.With above shown in transmitter architecture identical, for the system that has 2 transmit receive antennas, on each antenna, launch the signal of a road separate modulation.Test data frame length is 128 bits, and receiving terminal iterations is 16 times.Transverse axis representation signal signal noise energy Ratios in figure, the longitudinal axis represents bit error rate.
As shown in Figure 4, compared to single antenna environment, under many antenna environment, the error rate has remarkable reduction.For double needle hole channel circumstance, two transmit receive antenna systems are compared the gain that a single aerial system can obtain 10dB, and dual-antenna system can than the low 10dB of a single aerial system in the situation that, obtain identical accuracy in signal to noise ratio.
In Fig. 5, provide the castering action of iteration for the error rate, by iteration, reduced significantly the error rate, verified the validity of native system in pinhole channel.Meanwhile, under high s/n ratio condition, need more iterations to obtain the convergence of final result.
For 16QAM, each constellation positions can represent the signal of four code words, and each acknowledge(ment) signal is expressed as
Figure 90888DEST_PATH_IMAGE110
form,
Figure 41526DEST_PATH_IMAGE111
.Its ESE expression formula is:
Figure 924032DEST_PATH_IMAGE112
Figure 284310DEST_PATH_IMAGE114
Figure 722245DEST_PATH_IMAGE115
Figure 205179DEST_PATH_IMAGE116
Figure 677749DEST_PATH_IMAGE117
Figure 791198DEST_PATH_IMAGE118
Figure 778746DEST_PATH_IMAGE119
Figure 3054DEST_PATH_IMAGE120
Figure 411218DEST_PATH_IMAGE122
Figure 823745DEST_PATH_IMAGE123
Figure 851744DEST_PATH_IMAGE124
Figure 285316DEST_PATH_IMAGE126
Figure 185139DEST_PATH_IMAGE127
Figure 813567DEST_PATH_IMAGE128
Figure 475809DEST_PATH_IMAGE130
More the modulation algorithm of high-order in like manner can obtain.

Claims (3)

1. the iteration multi-antenna transmission method in pinhole channel, is characterized in that: it utilizes different interleavers to interweave to different antennas same user's information, and concrete steps are as follows:
(1) multi-antenna signal transmitting
First use encoder to
Figure 103444DEST_PATH_IMAGE001
individual user's input data
Figure 585372DEST_PATH_IMAGE002
carry out spread spectrum repeated encoding and generate coded data
Figure 844315DEST_PATH_IMAGE003
,
Figure 333065DEST_PATH_IMAGE004
,
Figure 335656DEST_PATH_IMAGE005
represent spread spectrum number of times, the Data duplication that is about to 1 data length becomes the data of N data length;
Secondly, be modulated on different antennas after utilizing different interleavers to interweave to sequence after encoding, if
For code signal
Figure 921358DEST_PATH_IMAGE006
total organize different interleavers
Figure 327249DEST_PATH_IMAGE008
, work as
Figure 179536DEST_PATH_IMAGE006
pass through interleaver
Figure 557428DEST_PATH_IMAGE009
after, generate transmitting sequence on antenna
Figure 621516DEST_PATH_IMAGE011
, it is
Figure 28226DEST_PATH_IMAGE006
that with certain random sequence, carries out rearranges,
Figure 526204DEST_PATH_IMAGE005
for data length;
Finally, will
Figure 32271DEST_PATH_IMAGE012
individual different user transmitting on each antenna merges launches;
(2) iteration check receives
First, to the multiple signals that receive, at each reception antenna, utilize ESE independently to adjudicate, draw initial estimation signal;
Secondly, will be from different antennae, the information that belongs to same group of user utilizes cumulative mean to merge, and obtains user's transmission information estimator value;
Then, utilize the decoder that repetition spreading code is corresponding to carry out decoding to sending coding estimated value, obtain the estimated value of original transmitted information, for user
Figure 248489DEST_PATH_IMAGE001
, the estimated value of its original transmitted signal is
Figure 944044DEST_PATH_IMAGE013
;
Follow again, will return to decoder, after it is encoded, obtain the estimated value of coding data sequences
Figure 973497DEST_PATH_IMAGE014
, and utilize user
Figure 411431DEST_PATH_IMAGE001
after corresponding interleaver interweaves, obtain the estimated value of transmission of data sequences
Figure 159944DEST_PATH_IMAGE015
, return it to the priori conditions as next iteration in decision device ESE and input;
Finally, repeat above-mentioned steps, carry out iteration, depending on signal length and number of users, carry out, after the iteration of 8 to 16 times, obtaining the estimated value of signal , now
Figure 480384DEST_PATH_IMAGE013
be final result.
2. iteration multi-antenna transmission method according to claim 1, is characterized in that: flow process when iteration check is checked and accepted is specific as follows:
First, to receiving checkout terminal, carry out initialization:
Secondly, utilize following algorithm to carry out successively iteration verification:
Wherein: the symbol probability that represents transmission information;
Figure 271513DEST_PATH_IMAGE018
the
Figure 555864DEST_PATH_IMAGE010
the average of individual user's corresponding data;
Figure 765128DEST_PATH_IMAGE019
the
Figure 793127DEST_PATH_IMAGE010
the variance of individual user's corresponding data;
Figure 974710DEST_PATH_IMAGE020
represent interference signal average, represent interference signal
Figure 708945DEST_PATH_IMAGE021
variance,
Figure 745034DEST_PATH_IMAGE023
the power that represents n transmitting antenna signal;
Figure 371187DEST_PATH_IMAGE024
represent
Figure 555044DEST_PATH_IMAGE010
the propagation coefficient of individual pin hole place signal; be respectively by transmitting terminal antenna to pin hole with have pin hole to the channel matrix of receiving terminal antenna;
Figure 81020DEST_PATH_IMAGE026
the transmission coding estimated value that represents this user; represent
Figure 798495DEST_PATH_IMAGE010
propagation coefficient matrix between individual pin hole;
Figure 952746DEST_PATH_IMAGE028
(s (j)=+ 1) represents the probability that the estimated value of original transmitted signal is+1;
Figure 25745DEST_PATH_IMAGE029
the thermal noise variance that represents receiver, shows with white Gauss noise form;
Finally, depending on signal length and number of users, carry out, after the iteration of 8 to 16 times, obtaining the estimated value of signal
Figure 993701DEST_PATH_IMAGE013
,
Figure 89833DEST_PATH_IMAGE013
be final result.
3. the iteration multi-antenna transmitting conveying device in pinhole channel, comprises transmitter and receiver, it is characterized in that:
Described transmitter comprises interleaver and the multiple transmit antennas of encoder, the independent random corresponding with transmitting antenna;
Described receiver comprises multiple receive antenna, independently carries out ESE decision device and the DEC decoder corresponding to user of symbol judgement.
Described each reception antenna is used independently interleaver to adjudicate, and to using the information of the interleaver that belongs to same user to merge decoding; Receive each antenna end of signal and use after independently ESE decision device is estimated, merge and send into DEC decoder and carry out signal interpretation and probability statistics, and utilize the transmission informational probability of estimating to carry out iteration renewal, the final effective estimation obtaining to received signal;
Described ESE decision device, utilizes the signal receiving and the prior probability that sends symbol, the estimated value of the chip that derivation receives;
Described DEC decoder, utilizes the value of adding up the transmitted signal obtaining, and prediction sends the priori value of symbol, and upgrades with this average that receives interference signal in signal
Figure 801437DEST_PATH_IMAGE020
and variance prediction, carry out iteration.
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