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 PDFInfo
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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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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
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
during antenna configuration, the envelope pattern of its channel as shown in Figure 1, wherein
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
pinhole channel,
the signal that individual receiving terminal antenna place receives can be expressed as:
Wherein
be respectively by transmitting terminal antenna to pin hole with have pin hole to the channel matrix of receiving terminal antenna.
represent that chip is long
a frame in corresponding bit sequence.
represent
the propagation coefficient of individual pin hole place signal.
represent the power that n transmitting antenna place transmits.
the noise that represents receiver.So, for whole system,
the total reception signal matrix of individual reception antenna is:
In formula
be respectively
dimension matrix,
(j) be
dimension square formation, s (j) is l the propagation coefficient vector that pin hole is corresponding,
be
dimensional vector,
be
dimensional vector;
the summation that represents noise.The fading envelope of having shown different pin hole configurations in Fig. 1.
(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
2) all pin hole propagation coefficients are independent
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
individual user's concurrent multiplexing, wherein
individual user's input data are
.Will input data
use encoder
carry out spread spectrum repeated encoding and generate coded data
,
,
represent spread spectrum number of times, the Data duplication that is about to 1 data length becomes the data of N data length; As
deng.
Secondly, be modulated on different antennas after utilizing different interleavers to interweave to sequence after encoding.If
For code signal
altogether
there is the interleaver that group is different
, work as
pass through interleaver
after, generate
transmitting sequence on antenna
for
that with certain random sequence, carries out rearranges,
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
.
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
, the transmission information estimator value obtaining is
.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
, for
.
Follow again, will
return to decoder, after it is encoded, obtain the estimated value of coding data sequences
, and utilize user
after corresponding interleaver interweaves, obtain the estimated value of transmission of data sequences
, 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
be final result.
Shown in above, the
the signal that individual receiving terminal antenna place receives can be expressed as:
Can be from belonging to same user by all receiving signal decomposition one-tenth
useful information and other all interference of antenna transmission
the addition of summation:
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
gaussian Profile wherein,
represent interference signal
average,
represent interference signal
variance.
probability density function can be expressed from the next:
When using AWGN model description receiver noise
time, its average
be 0, variance
for
.Therefore,
average
just can represent with following formula:
Wherein
the
the average of individual user's corresponding data,
the
the variance of individual user's corresponding data.Wherein
,
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:
For formulating channel, channel fading coefficient
,
with transmitting power
known.Due to above-mentioned demonstration
gaussian distributed, so
also meet Gaussian Profile, its average and variance are respectively:
In like manner known, when transmitting for-1 time, the average and the variance that receive signal are respectively:
Shown in the same figure decoder architecture, each antenna is by process judgement signal thereafter
use corresponding interleaver deinterleaving to obtain
.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
.Meanwhile, by the symbol probability of the information of transmission
as feedback information, send decision device back to and carry out next iteration judgement.Wherein,
In estimation, receive noise
average
and variance
in process, need to utilize to transmit
average
and variance
, these information can be passed through above-mentioned
calculate.For BPSK modulation, average
:
Finally, utilize transmitting of calculating
average
and variance
, upgrade and receive noise
average
and variance
, and further upgrade court verdict with
with sending probability
, 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
root reception antenna and
individual DEC decoder.Wherein user 1 information is represented by solid line, and another organizes different user
information be illustrated by the broken lines.Wherein
,
represent to belong to respectively user
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
and variance
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
individual user's input data are
, use encoder
carry out spread spectrum repeated encoding and generate coded data
,
,
represent spread spectrum number of times.As
deng.
Secondly, be modulated on different antennas after utilizing different interleavers to interweave to sequence after encoding.If for code signal
altogether
there is the interleaver that group is different
, work as
pass through interleaver
after, generate
transmitting sequence on antenna
for
that with certain random sequence, carries out rearranges,
for data length.
Finally, by different user, the transmitting merging on each antenna is launched.
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;
the
the average of individual user's corresponding data;
the
the variance of individual user's corresponding data;
represent interference signal
average,
represent interference signal
variance,
the power that represents n transmitting antenna signal;
represent
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;
the transmission coding estimated value that represents this user;
represent
propagation coefficient matrix between individual pin hole;
(s (j)=+ 1) represents the probability that the estimated value of original transmitted signal is+1;
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
,
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:
Wherein,
represent that all corresponding positions are
modulation signal combination, under QPSK modulation,
,
.
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
form,
.Its ESE expression formula is:
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
individual user's input data
carry out spread spectrum repeated encoding and generate coded data
,
,
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
total
organize different interleavers
, work as
pass through interleaver
after, generate
transmitting sequence on antenna
, it is
that with certain random sequence, carries out rearranges,
for data length;
(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
, the estimated value of its original transmitted signal is
;
Follow again, will
return to decoder, after it is encoded, obtain the estimated value of coding data sequences
, and utilize user
after corresponding interleaver interweaves, obtain the estimated value of transmission of data sequences
, return it to the priori conditions as next iteration in decision device ESE and input;
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;
the
the average of individual user's corresponding data;
the
the variance of individual user's corresponding data;
represent interference signal
average,
represent interference signal
variance,
the power that represents n transmitting antenna signal;
represent
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;
the transmission coding estimated value that represents this user;
represent
propagation coefficient matrix between individual pin hole;
(s (j)=+ 1) represents the probability that the estimated value of original transmitted signal is+1;
the thermal noise variance that represents receiver, shows with white Gauss noise form;
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;
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CN105187169A (en) * | 2015-09-30 | 2015-12-23 | 复旦大学 | Iterative multiple-input multiple-output communication system and method based on IDMA |
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2013
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