CN102111357B - Relay demodulating and forwarding system and method for overcoming signal distortion - Google Patents
Relay demodulating and forwarding system and method for overcoming signal distortion Download PDFInfo
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- CN102111357B CN102111357B CN 200910247316 CN200910247316A CN102111357B CN 102111357 B CN102111357 B CN 102111357B CN 200910247316 CN200910247316 CN 200910247316 CN 200910247316 A CN200910247316 A CN 200910247316A CN 102111357 B CN102111357 B CN 102111357B
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Abstract
The invention relates to a relay demodulating and forwarding system and method for overcoming signal distortion. The specific steps of the method are as follows: a relay utilizes a soft-modulated coding bit posterior probability to calculate a re-modulated symbol expected value, wherein mod2 indicates the modulation mode of a second jump selection; and the relay maps the calculated symbol expected value to a constellation point of the mod2 according to a certain norm, such as the minimum Euclidean distance norm. By adopting the invention, error spread of the decoding and forwarding technologyis reduced, and particularly, the spectrum effectiveness of the system under centralized scheduling is improved.
Description
Technical field
The present invention relates to relaying demodulation forwarding scheme and introduce the problem domain of extra signal distortion, propose a kind of relaying demodulation retransmission method that overcomes signal distortion.This invention is applicable to the various scenes that have relaying, comprises double bounce or multi-hop, cooperating relay or non-cooperating relay, transparent relay or nontransparent relaying etc.
Background technology
Relaying technique obtains extensive concern because it can effectively increase coverage with strengthening throughput of system.In the relaying retransmission technique of present broad research, the demodulation retransmission technique is one of topmost relaying retransmission technique wherein.The relaying that adopts demodulation to transmit mainly carries out equilibrium, demodulation, declares the back remodulates firmly from signal of base station what receive, then the signal that produces again is transmitted to terminal.The pluses and minuses that demodulation is transmitted are apparent: its advantage is the signal of can living again to a certain extent, channel and the noise effect of inhibition from the source end to relaying, owing to need not separate channel interleaver and decoding, processing delay is little, and supports relaying according to carry out the link circuit self-adapting transmission from the channel quality that is relayed to destination.Exactly because but shortcoming also relaying do not decipher, thereby can't carry out cyclic redundancy check (CRC) and the information of the version correctness of not knowing to receive.If the source end is relatively poor to the channel quality of relaying, relaying carries out declaring firmly after the demodulation to the version that receives, and will lose soft information, if modulation again more at this moment, particularly the exponent number of remodulates is different with source end order of modulation, for example becomes 16QAM from QPSK, then can introduce extra signal distortion.How can keep soft information as far as possible, to avoid signal distortion, be a good problem to study.
The compromise proposal of transmitting is transmitted and deciphered to traditional demodulation forward relay scheme as amplifying, advantage with both, be that processing delay is little, transmit rapidly and simultaneously can suppress the source end to a certain extent to the channel of relaying and the advantage of noise effect, thereby obtain extensive concern.See also shown in the system block diagram of Fig. 1.
At first, the source end carries out information bit to send to relaying after chnnel coding, rate-matched, modulation and the channel interleaving.Relaying carries out equilibrium after receiving signal, demodulation is declared then firmly, and the bit after declaring is firmly sent to terminal according to being relayed to after link of terminal quality adaptation selecting modulation mode is modulated again.Terminal is received and is carried out equilibrium behind the signal, separates channel interleaving, separates and be in harmonious proportion after the decoding, information bit is declared firmly.
Because relaying is not understood channel interleaving and decoding, so processing delay is little, can transmit packet rapidly.Exactly because yet do not decipher, relaying can't know whether the information after declaring firmly is correct, if in case make mistakes, declare firmly and can lose soft information, again modulate again, particularly when second modulation system of jumping was different from the modulation system of first jumping, modulation can be introduced extra signal distortion again, thereby makes the terminal receptivity bring loss.
How utilizing the soft information after the demodulation to reduce to declare firmly again the extra distortion that modulation is again introduced as far as possible, is a good problem to study.Motivation of the present invention that Here it is.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of relaying demodulation retransmission method that overcomes signal distortion, the signal distortion of modulation again after can utilizing soft information after the demodulation effectively to overcome to declare firmly, thus improve the terminal receptivity.
For solving the problems of the technologies described above, the present invention adopts following technical scheme: a kind of relaying demodulation repeater system that overcomes signal distortion, the relaying that this system comprises the source end, be connected by channel with the source end and the terminal that is connected by channel with relaying, described source end comprise and connecting successively
Coding module, being used for handle needs the information transmitted bit to carry out chnnel coding, thereby obtains coded-bit;
The rate-matched module is used for coded-bit is punched, with the coupling code check adaptively selected according to channel quality;
Modulation module is for the complex symbol that the coded-bit after the punching is become selected modulation by the regulation of modulation system;
Interleaving block, the complex symbol after being used for modulate is upset symbol in proper order, the error burst that brings with the deep fade that overcomes channel;
Described relaying comprises the balance module that connects successively, is used for carrying out the time-domain and frequency-domain equilibrium through the complex symbol of being upset the symbol order behind the interleaving block;
Soft demodulation module is for the posterior probability that the complex symbol after the equilibrium is mapped to coded-bit;
Symbol desired value module is used for calculating the desired value of selecting the complex symbol of modulating according to the posterior probability of coded-bit after the soft demodulation;
The sign map module, the desired value that is used for selecting the complex symbol of modulation is mapped to the constellation point of selected modulation system;
Described terminal comprises the balance module that connects successively, and the complex symbol that relaying is exported carries out the time-domain and frequency-domain equilibrium;
De-interleaving block is used for the complex symbol after the equilibrium is reverted to original symbol order according to the interleaving mode of the interleaving block of source end;
Demodulation module is for the soft information that the complex symbol after the equilibrium is mapped to binary coding bit or coded-bit;
Decoding module is used for coded-bit is carried out channel decoding, obtains the soft information of all coded-bits;
Information bit is declared module firmly, is used for the soft information judgement of coded-bit is binary information bit.
The present invention also comprises a kind of relaying demodulation retransmission method that overcomes signal distortion, and this method may further comprise the steps:
Step 1, the source end carries out information bit to send to relaying after chnnel coding, rate-matched, modulation and the channel interleaving;
Step 2, relaying are carried out equilibrium after receiving signal, the symbol desired value after the soft demodulation is calculated in soft demodulation then;
Step 3, relaying is mapped to the 2nd to this symbol desired value and jumps on selected modulation system and the constellation point its Euclidean distance minimum and send to terminal.
The present invention proposes a kind of novel demodulation and transmits scheme, the signal distortion of modulation again after it can utilize soft information after the demodulation effectively to overcome to declare firmly, thus improve the terminal receptivity.The present invention is applied to exist the various scenes of relaying, comprises double bounce or multi-hop, cooperating relay or non-cooperating relay, transparent relay or nontransparent relaying etc.
Description of drawings:
Fig. 1 is the system block diagram of existing demodulation forward relay method;
Fig. 2 is the system block diagram of demodulation forward relay method of the present invention;
Fig. 3 carries out the simulation curve of link simulation for the embodiment of the invention.
Embodiment
Please refer to shown in Figure 2, a kind of relaying demodulation repeater system that overcomes signal distortion, the relaying that this system comprises the source end, be connected by channel with the source end and the terminal that is connected by channel with relaying, described source end comprises the coding module that connects successively, being used for handle needs the information transmitted bit to carry out chnnel coding, thereby obtains coded-bit; The rate-matched module is used for coded-bit is punched, with the coupling code check adaptively selected according to channel quality; Modulation module is for the complex symbol that the coded-bit after the punching is become selected modulation by the regulation of modulation system; Interleaving block, the complex symbol after being used for modulate is upset symbol in proper order, the error burst that brings with the deep fade that overcomes channel;
Described relaying comprises the balance module that connects successively, is used for carrying out the time-domain and frequency-domain equilibrium through the complex symbol of being upset the symbol order behind the interleaving block; Soft demodulation module is for the posterior probability that the complex symbol after the equilibrium is mapped to coded-bit; Symbol desired value module is used for calculating the desired value of selecting the complex symbol of modulating according to the posterior probability of coded-bit after the soft demodulation; The sign map module, the desired value that is used for selecting the complex symbol of modulation is mapped to the constellation point of selected modulation system;
Described terminal comprises the balance module that connects successively, and the complex symbol that relaying is exported carries out the time-domain and frequency-domain equilibrium; De-interleaving block is used for the complex symbol after the equilibrium is reverted to original symbol order according to the interleaving mode of the interleaving block of source end; Demodulation module is for the soft information that the complex symbol after the equilibrium is mapped to binary coding bit or coded-bit; Decoding module is used for coded-bit is carried out channel decoding, obtains the soft information of all coded-bits; Information bit is declared module firmly, is used for the soft information judgement of coded-bit is binary information bit.
Described relaying further comprises the equivalent signal-to-noise ratio estimation module that is connected with the sign map module, is used for the equivalent signal-to-noise ratio of estimated output signal, and this equivalence signal-to-noise ratio (SNR) estimation module other end is connected with the demodulation module of terminal.
Introduce the problem of extra signal distortion at relay system traditional demodulation forwarding scheme, the present invention also proposes a kind of novel demodulation and transmits scheme, again the signal distortion of modulation after it can utilize soft information after the demodulation effectively to overcome to declare firmly, thus the terminal receptivity improved.Its key step is as follows:
1. after relaying receives data, data are carried out equilibrium, utilize existing maximum likelihood or maximal posterior probability algorithm to carry out soft demodulation then, obtain the posterior probability (APP) of each coded-bit, note is done
Z wherein
kRepresent balanced back k symbol to be demodulated, b
i kExpression is corresponding to z
kI bit after the demodulation, q=0 or 1.
2. relaying utilizes symbol desired value after the posterior probability of the above-mentioned coded-bit that obtains is calculated again modulation then, namely
Wherein mod2 represents that the 2nd jumps the modulation system of choosing.
3. relaying is mapped to the constellation point of mod2, for example the least euclidean distance criteria to the symbol desired value of trying to achieve according to certain criterion
Wherein Mi represents the constellation point in the mod2 modulation system.
4. as the optional function that strengthens, relaying can be estimated the equivalent signal-to-noise ratio of the symbol after the remodulates, and is transferred to terminal together with data.Terminal utilizes this equivalence signal to noise ratio to carry out demodulation, improves the accuracy of demodulation, thereby further improves receptivity.
The system block diagram of this New Scheme correspondence is as shown below:
At first, the source end carries out information bit to send to relaying after chnnel coding, rate-matched, modulation and the channel interleaving.Relaying receive carry out equilibrium behind the signal, the symbol expectation after the remodulates is calculated in soft demodulation then, again this numerical value is mapped to the 2nd and jumps on selected modulation system and the constellation point its Euclidean distance minimum, sends to terminal then.As option, relaying can be estimated the equivalent signal-to-noise ratio of output symbol, sends to terminal together with data.Terminal is received and is carried out equilibrium behind the signal, separates channel interleaving, separates and be in harmonious proportion after the decoding, information bit is declared firmly.If the relay transmission equivalent signal-to-noise ratio, then terminal is utilized its input demodulation module, improves the accuracy of demodulation, further improves receptivity.
According to above-mentioned innovative point, we provide the specific embodiment that scheme is transmitted in novel demodulation.
Suppose that the 2nd jumps employing 16QAM modulation.The 1st jumps the modulation of adopting does not limit.Then the processing procedure of relaying is as follows:
1. make M2=4 represent the exponent number of the 2nd jumping modulation system 16QAM.
2. the note of the coded-bit posterior probability after the soft demodulation of relaying is done
With
J=M wherein
1* k+i, M1 represent the exponent number of the 1st jumping modulation system
3. relaying calculates the 2nd desired value E{S that jumps l symbol of 16QAM modulation according to expression then
Relay, 16QAM, l}=M
0000P
APP(b
4l+1=0) P
APP(b
4l+2=0) P
APP(b
4l+3=0) P
APP(b
4l+4=0)+M
0001P
APP(b
4l+1=0) P
APP(b
4l+2=0) P
APP(b
4l+3=0) P
APP(b
4l+4=1)+... + M
1111P
APP(b
4l+1=1) P
APP(b
4l+2=1) P
APP(b
4l+3=1) P
APP(b
4l+4=1) M wherein
0000, M
0001..., M
1111Be 16 constellation point of 16QAM modulation.
4. if select the least euclidean distance criteria for use, then relaying is mapped to the constellation point of 16QAM according to expression:
Following table is to carry out link simulation at this embodiment and aforesaid existing scheme, and simulation parameter is as follows: simulation curve as shown in Figure 3.
| The scheme of emulation contrast | 1) scheme 2 is transmitted in existing demodulation) the present invention: relaying does not send equivalent signal-to-noise ratio scheme 3) and the present invention: relaying sends the equivalent signal-to-noise ratio scheme |
| Modulation | The 1st jumps: QPSK |
| The 2nd jumps: 16QAM | |
| Channel model | Gaussian channel |
| Code length | 324 |
| Chnnel coding | (13,11) 8Turbo sign indicating number |
| Code check | 1/2 |
From above-mentioned simulation curve as can be seen, the solution of the present invention has obvious performance gain than existing scheme, and frame error rate is when 10-1, and the scheme that relaying does not send equivalent signal-to-noise ratio has the 0.5dB gain than existing scheme.Relaying sends the equivalent signal-to-noise ratio scheme can also additionally obtain the 0.2dB gain.
Above-mentioned specific embodiment carries out at double bounce transmission, non-cooperation, nontransparent relaying, but the present invention is not limited thereto.Multi-hop transmission, cooperating relay and transparent relay can both simply be applied.
Above-described embodiment just lists expressivity principle of the present invention and effect is described, but not is used for restriction the present invention.Any personnel that are familiar with this technology all can make amendment to above-described embodiment under spirit of the present invention and scope.Therefore, the scope of the present invention should be listed as claims.
Claims (7)
1. relaying demodulation repeater system that overcomes signal distortion, the relaying that this system comprises the source end, be connected by channel with the source end with relaying by the terminal that channel is connected, it is characterized in that: described source end comprises coding module, rate-matched module, modulation module and the interleaving block that connects successively;
Described coding module is used for handle needs the information transmitted bit to carry out chnnel coding, thereby obtains coded-bit;
Described rate-matched module is used for coded-bit is punched, with the coupling code check adaptively selected according to channel quality;
Described modulation module is used for the coded-bit after the punching is become by the regulation of modulation system the complex symbol of selected modulation;
Complex symbol after described interleaving block is used for modulate is upset symbol in proper order, the error burst that brings with the deep fade that overcomes channel;
Described relaying comprises balance module, soft demodulation module, symbol desired value module and the sign map module that connects successively;
Described balance module is used for and will carries out the time-domain and frequency-domain equilibrium through the complex symbol of being upset the symbol order behind the interleaving block;
Described soft demodulation module is used for utilizing existing maximum likelihood or maximal posterior probability algorithm to carry out soft demodulation the complex symbol after the equilibrium, obtains the posterior probability APP of each coded-bit, and note is done
Z wherein
kRepresent balanced back k symbol to be demodulated,
Expression is corresponding to z
kI bit after the demodulation, q=0 or 1; Described symbol desired value module is used for calculating according to the posterior probability of coded-bit after the soft demodulation desired value of the complex symbol of selected modulation, namely
Wherein mod2 represents that the 2nd jumps the modulation system of choosing;
Described sign map module is for the desired value the least euclidean distance criteria of the complex symbol that will select modulation
Be mapped to the constellation point of mod2; Wherein Mi represents the constellation point in the mod2 modulation system;
Described terminal comprises balance module, de-interleaving block, demodulation module and the decoding module that connects successively; Described balance module carries out the time-domain and frequency-domain equilibrium with the complex symbol of relaying output;
Described de-interleaving block is used for the complex symbol after the equilibrium is reverted to original symbol order according to the interleaving mode of the interleaving block of source end;
Described demodulation module is used for the complex symbol after the equilibrium is mapped to the soft information of binary coding bit or coded-bit;
Described decoding module is used for coded-bit is carried out channel decoding, obtains the soft information of all coded-bits;
Information bit is declared module firmly, is used for the soft information judgement of coded-bit is binary information bit.
2. a kind of relaying demodulation repeater system that overcomes signal distortion as claimed in claim 1, it is characterized in that: described relaying further comprises the equivalent signal-to-noise ratio estimation module that is connected with the sign map module, be used for the equivalent signal-to-noise ratio of estimated output signal, this equivalence signal-to-noise ratio (SNR) estimation module other end is connected with the demodulation module of terminal.
3. relaying demodulation retransmission method that overcomes signal distortion is characterized in that this method may further comprise the steps: step 1, and the source end carries out information bit to send to relaying after chnnel coding, rate-matched, modulation and the channel interleaving;
Step 2, relaying are carried out equilibrium after receiving signal, the symbol desired value after the soft demodulation is calculated in soft demodulation then; Step 3, relaying are mapped to this symbol desired value on selected modulation system and the constellation point its Euclidean distance minimum of the 2nd jumping and send to terminal;
Soft demodulation adopts maximum likelihood or maximal posterior probability algorithm to carry out in the described step 2, obtains the posterior probability of each coded-bit, and note is done
Z wherein
kRepresent balanced back k symbol to be demodulated,
Expression is corresponding to z
kI bit after the demodulation, q=0 or 1.
4. a kind of relaying demodulation retransmission method that overcomes signal distortion as claimed in claim 3, it is characterized in that: the symbol desired value in the described step 2 is
Mod wherein
2Represent that the 2nd jumps the modulation system of choosing, wherein z
kRepresent balanced back k symbol to be demodulated,
Expression is corresponding to z
kI bit after the demodulation, q=0 or 1.
5. a kind of relaying demodulation retransmission method that overcomes signal distortion as claimed in claim 3 is characterized in that: in the described step 3 relaying the symbol desired value according to the least euclidean distance criteria
Be mapped to mod
2Constellation point, M wherein
iRepresent mod
2Constellation point in the modulation system.
6. a kind of relaying demodulation retransmission method that overcomes signal distortion as claimed in claim 3 is characterized in that: further comprise the equivalent signal-to-noise ratio of relaying estimation output symbol in the described step 3, and this equivalence noise ratio is transmitted to terminal.
7. a kind of relaying demodulation retransmission method that overcomes signal distortion as claimed in claim 6, it is characterized in that: the relay transmission equivalent signal-to-noise ratio is to terminal, and terminal inputs to demodulation module with it.
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| CN103236909B (en) * | 2013-05-13 | 2015-11-18 | 山东师范大学 | Multi-system soft information retransmission method in Rayleigh channel |
| CN107517483B (en) * | 2017-08-24 | 2020-11-13 | 南京邮电大学 | Relay distribution method for densely deployed wireless heterogeneous network |
| WO2019196913A1 (en) * | 2018-04-12 | 2019-10-17 | 华为技术有限公司 | Method and apparatus for transmitting non-uniform probability modulated data |
| CN110380999B (en) | 2018-04-12 | 2020-10-09 | 华为技术有限公司 | Probability non-uniform modulation data transmission method and device |
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