CN102006099A - Iterative combined detection and decoding method with interference elimination and system thereof - Google Patents
Iterative combined detection and decoding method with interference elimination and system thereof Download PDFInfo
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Abstract
The invention discloses an iterative combined detection and decoding method with interference elimination and a system thereof, which are used for reducing intersymbol interference generated by signals. The method comprises the following steps of: performing encoding, interlacing and modulation/spread spectrum on the decoded data of the last user to generate a burst signal of the last user for performing interference elimination on received signals; removing the burst signal from the received signal in the current time slot and performing combined detection on the remaining user data; and extracting detection symbols to perform demodulation and deinterlacing to decode the data of the current user for returning to encoding, interlacing and modulation/spread spectrum modules to generate a burst signal until demodulation, deinterlacing and decoding modules decode the required user data. The iterative mode is combined with the combined detection and decoding and the interference elimination is utilized, so the accuracy of judgment is improved, the detection performance is improved on the whole and the performance of a receiver is improved.
Description
Technical field
The present invention relates to the inhibition or the restriction technologies field of noise in the telecommunication transmission or interference, in particular, what relate to is a kind of method and system thereof of the iterative joint detection and decoding with interference eliminated.
Background technology
Under frequency-selective channel, signal can produce intersymbol interference ISI (Inter-Symbol Interference is hereinafter to be referred as ISI), has also just reduced the performance of receiver undoubtedly; With the TDD-CDMA system is example, and as shown in Figure 1, the channel model of traditional transmitter is: from the 1st user's that encode bit → interweave → modulate/spread spectrum K
(1)Individual sign indicating number → through the 1st channel h
(1)→ the 1 user's signal is to from U the user's that encode bit → interweave → modulate/spread spectrum K
(U)Individual sign indicating number → through U channel h
(U)→ the U user's signal, U user's signal aloft mixes, and is subjected to noise pollution; Corresponding, as shown in Figure 2, the joint detection and decoding process of traditional receiver is: received signal when entering joint-detection in conjunction with channel estimating and channel average → from demodulation K
(1)Individual sign indicating number → deinterleaving → decode the 1st user's bit, to demodulation K
(U)Individual sign indicating number → deinterleaving → decode U user's bit; Wherein, the average meaning of channel is that received signal has only been passed through U real channel, so u real channel is then by K
(U)The average acquisition of individual code channel, and improve accuracy of channel estimation with this.
Above-mentioned whole process is referred to as separate type joint detection and decoding SJDAD (Separate Joint Detection and Decoding).In fact, SJDAD does not utilize interference eliminated, does not utilize the judgement gain of decoder yet, causes the accuracy of adjudicating and the decreased performance of detection, is difficult to improve the performance of traditional receiver.
Therefore, prior art still haves much room for improvement and develops.
Summary of the invention
The objective of the invention is, be to provide a kind of method and system thereof of the iterative joint detection and decoding with interference eliminated, can utilize interference eliminated, and can be in conjunction with the judgement gain of decoder, can improve the accuracy of judgement and the performance of detection thus, to improve the performance of receiver.
Technical scheme of the present invention is as follows:
A kind of iterative joint detection and decoding method with interference eliminated is used to reduce the intersymbol interference that signal produces, and may further comprise the steps:
A, a last user data that will decode are encoded, are interweaved and modulate/spread spectrum, to generate a last user's burst, are used for carrying out to received signal interference eliminated;
The described burst of subduction B, the received signal in current time slots, the remaining user data of joint-detection;
C, extraction detected symbol are carried out demodulation, deinterleaving, decode active user's data, and return in the described steps A, until decoding needed user data.
Described method wherein, comprises in the described steps A:
A1, decode the 1st u user's to U the user Bit data, wherein, U and u are the counting natural number, and 1≤u≤U.
Described method wherein, comprises after the described steps A 1:
A2, described u user's Bit data is carried out encoding process;
A3, code signal is carried out interleaving treatment.
Described method wherein, comprises after the described steps A 3:
The code signal that A4, modulation treatment have interweaved uses spreading factor to carry out the bandwidth expansion, obtains a last user's burst.
Described method wherein, reaches step B after the described steps A 4 and comprises before:
Received signal after D, the channel estimating is carried out the channel average treatment, to improve accuracy of channel estimation.
Described method, wherein, described step D specifically comprises:
D1, utilize Kc sign indicating number and Kc channel of midamble skew estimation in the time slot, wherein,
K
(u)Be u user's code channel, midamble is a training sequence code;
D2, to u user's K
(u)Individual code channel averages, and obtains u channel.
A kind of iterative joint detection and decoding system with interference eliminated comprises a coding, interweaves and modulate/spread spectrum module, an arrester, a detector and a demodulation, deinterleaving and decoder module, is used to reduce the intersymbol interference of signal generation; Wherein:
Described coding, interweave and modulate/spread spectrum module, be used for the last user data that will decode from described demodulation, deinterleaving and decoder module, encode, interweave and modulate/spread spectrum,, be used for carrying out to received signal interference eliminated to generate active user's burst;
Described arrester is used for the described burst of received signal subduction in the current time slots;
Described detector is used for joint-detection through remaining user data after the described arrester subduction;
Described demodulation, deinterleaving and decoder module, be used for the detected symbol of extracting is carried out demodulation, deinterleaving, and decode active user's data, be used to return described coding, interweave and modulate/spread spectrum module to be to generate burst, decodes needed user data until described demodulation, deinterleaving and decoder module.
Described system, wherein, described system also comprises a channel estimating/average module, is positioned at the front end of described detector, is used for carrying out earlier to received signal carrying out the average processing of channel after the channel estimating, to improve accuracy of channel estimation.
The method and the system thereof of a kind of iterative joint detection and decoding with interference eliminated provided by the present invention, because the mode with iteration combines joint detection and decoding, also utilized interference eliminated, improved the accuracy of judgement thus, and improved the performance that detects on the whole, thereby improved the performance of receiver.
Description of drawings
Fig. 1 is transmitter and the channel model schematic block diagram of TDD-CDMA in the prior art;
Fig. 2 is receiver and the channel model schematic block diagram of TDD-CDMA in the prior art;
Fig. 3 among the present invention based on the joint detection and decoding method schematic diagram of iteration;
Fig. 4 is multidiameter fading channel parameter list trrellis diagram in the TD-SCDMA standard of the inventive method employing;
The physical channel parameters table that Fig. 5 uses for the inventive method;
The performance of MMSE-BDFE and IJDAAD compared schematic diagram when Fig. 6 was the inventive method K=4;
The performance of MMSE-BDFE and IJDAAD compared schematic diagram when Fig. 7 was the inventive method K=8;
The performance of MMSE-BDFE and IJDAAD compared schematic diagram when Fig. 8 was the inventive method K=16.
Embodiment
Below with reference to accompanying drawing, the embodiment and the embodiment of method of the present invention and system thereof described in detail.
The method and the system thereof of a kind of iterative joint detection and decoding with interference eliminated of the present invention, in brief, with the mode of iteration process, also considered interference eliminated simultaneously in conjunction with joint detection and decoding, improve the accuracy of judgement and the performance of detection thus, improved the performance of receiver.Technology such as semi-static and dynamic parameter as for intersymbol interference ISI, TDD-CDMA, midamble skew, MMSE-BDFE and transmission channel are well known to those skilled in the art, and do not repeat them here.
Specifically, when the joint-detection that adopts based on interference eliminated, if the symbol of judgement can be more accurate, the performance of Jian Ceing will be better so; To this, what the inventive method adopted is, judgement is postponed till carried out after a user's decoding finished again; That is to say, after the decoding of finishing a user, this user's bit encoded again again → interweaved → modulate/spread spectrum, and form burst thus as court verdict; Then, reduce from the reception chip of current time slots by arrester and to go these bursts, detect remaining user data by detector again.So the recursive process of carrying out repeatedly to form is referred to as iteration, in the iterative process each time, must have that user's data is decoded comes out, the circulation by making up a fixed number of times or the condition of finishing iteration process can realize the control to whole iterative process; And this process is referred to as iterative joint detection and decoding IJDAD (Iterative Joint Detection and Decoding).
A kind of iterative joint detection and decoding method of the present invention with interference eliminated, as shown in Figure 3, concrete flow process may further comprise the steps:
Step S110, a last user data that will decode are encoded, are interweaved and modulate/spread spectrum, to generate active user's burst, are used for carrying out to received signal interference eliminated.Specifically comprise: decode the 1st u user's to U the user Bit data earlier, wherein, U and u are the counting natural number, and 1≤u≤U; Bit data with described u user carries out encoding process again; Then utilize the chnnel coding error correction that code signal is carried out interleaving treatment; The code signal that interweaved of modulation treatment uses spreading factor to carry out the bandwidth expansion then, obtains spreading code, at last described spreading code is generated the burst in the current time slots.
Step S120, the received signal after the channel estimating is carried out the channel average treatment, to improve accuracy of channel estimation.Specifically comprise: utilize Kc yard and a midamble skew estimation Kc channel in the time slot, wherein,
K
(u)Be u user's code channel, midamble is a training sequence code; Adopt K again
(u)Individual code channel averages U channel, obtains u channel.
The described burst of subduction step S130, the received signal in current time slots, the remaining user data of joint-detection.
Step S140, extraction detected symbol are carried out demodulation, deinterleaving, decode active user's data, and return in the described steps A, until decoding needed user data.
Need to prove that compare with above-mentioned SJDAD, IJDAD has utilized interference eliminated, also utilized the judgement gain of decoder, thus the accuracy of judgement and the performance of detection improved, thus improved the performance of traditional receiver.Certainly, the computation complexity of IJDAD is also higher than the computation complexity of SJDAD certainly.
A kind of iterative joint detection and decoding system of the present invention with interference eliminated, the method of corresponding the invention described above, one of its embodiment, comprise a coding, interweave and modulate/spread spectrum module, a channel estimating/average module, an arrester, a detector and a demodulation, deinterleaving and decoder module, be used to reduce the intersymbol interference of signal generation; Wherein:
Described coding, interweave and modulate/spread spectrum module, be used for the last user data that will decode from described demodulation, deinterleaving and decoder module, encode, interweave and modulate/spread spectrum,, be used for carrying out to received signal interference eliminated to generate active user's burst;
Described channel estimating/average module is used for carrying out earlier to received signal carrying out the average processing of channel after the channel estimating, to improve accuracy of channel estimation;
Described arrester is used for the described burst of received signal subduction in the current time slots;
Described detector is used for joint-detection through remaining user data after the described arrester subduction;
Described demodulation, deinterleaving and decoder module, be used for the detected symbol of extracting is carried out demodulation, deinterleaving, and decode active user's data, be used to return described coding, interweave and modulate/spread spectrum module to be to generate burst, decodes needed user data until described demodulation, deinterleaving and decoder module.
Be the performance of checking the inventive method and system, emulation experiment is carried out at the TDD-CDMA system, adopts the multidiameter fading channel parameter of recommending in the TD-SCDMA standard, as shown in Figure 4, can adopt the parameter of case3.Suppose that channel is to become when non-in a Burst Period, promptly channel tap is fixed in a Burst Period; Maximum time delay is 16 chip period, and carrier frequency is 2GHz.Hypothesis has a transmission channel in the code multiplexing process, and the semi-static parameter of this transmission channel is: TTI=10ms, and code=convolution 1/3, CRC=12, RM=1; And the dynamic part of this transmission channel is specified by transformat combination TFC (Transport Format Combination), and the quantity of transmission block TB (Transport Blocks) is 1; When U=4, TB is of a size of 210; When U=8, TB is of a size of 93; When U=16, TB is of a size of 34; So the purpose that is provided with is, deletes surplus/repetition ratio near 1 in order to make, in other words, is exactly almost not delete surplus or repeat, and does not delete surplus or repeat just to mean that rate-matched is to decoding and even not influence of whole experiment.
For this reason, as shown in Figure 5, in the employed physical channel parameters of the inventive method, code word is the length of transformat combination indication TFCI (Transport Format Combination Indicator), and TPC refers to the length of transmitting power control (Transmission Power Control).When U=4, the number K of u sign indicating number
(u)=4, u=1 ..., 4; When U=8, K
(u)=2, u=1 ..., 8; When U=16, K
(u)=1, u=1 ..., 16.Channel impulse response for receiver, specifically can be by B.Steiner and P.W.Baiser, " Low cost channel estimation in the uplink receiver of CDMA mobile radio systems; " Frequenz, vol.47, pp.292-298, the method for introducing among the Nov./Dec.1993 is estimated to obtain; Use above parameter, and will delete surplus restriction PL (Puncturing Limit) and be set to 1, after rate-matched, the number of institute's assigned code is 16; The soft decoding of 8 quantifications is then adopted in the soft decoding of convolution code.Shown in accompanying drawing 6,7 and 8, Conventional represents traditional separate type joint detection and decoding SJDAD; The result of emulation experiment shows, as K=4,8 or 16 the time, detecting on the performance, and iterative joint detection and decoding IJDAD of the present invention has improved much really than traditional separate type joint detection and decoding SJDAD.
Should be understood that; for those of ordinary skills; the iterative joint detection and decoding technology of band interference eliminated can be improved or conversion according to the above description, and all these improvement and conversion all should belong to the protection range of claims of the present invention.
Claims (8)
1. the iterative joint detection and decoding method with interference eliminated is used to reduce the intersymbol interference that signal produces, and may further comprise the steps:
A, a last user data that will decode are encoded, are interweaved and modulate/spread spectrum, to generate a last user's burst, are used for carrying out to received signal interference eliminated;
The described burst of subduction B, the received signal in current time slots, the remaining user data of joint-detection;
C, extraction detected symbol are carried out demodulation, deinterleaving, decode active user's data, and return in the described steps A, until decoding needed user data.
2. method according to claim 1 is characterized in that, comprises in the described steps A:
A1, decode the 1st u user's to U the user Bit data, wherein, U and u are the counting natural number, and 1≤u≤U.
3. method according to claim 2 is characterized in that, comprises after the described steps A 1:
A2, described u user's Bit data is carried out encoding process;
A3, code signal is carried out interleaving treatment.
4. method according to claim 3 is characterized in that, comprises after the described steps A 3:
The code signal that A4, modulation treatment have interweaved uses spreading factor to carry out the bandwidth expansion, obtains a last user's burst.
5. method according to claim 4 is characterized in that, reaches step B after the described steps A 4 and comprises before:
Received signal after D, the channel estimating is carried out the channel average treatment, to improve accuracy of channel estimation.
6. method according to claim 5 is characterized in that, described step D specifically comprises:
D1, utilize Kc sign indicating number and Kc channel of midamble skew estimation in the time slot, wherein,
K
(u)Be u user's code channel, midamble is a training sequence code;
D2, to u user's K
(u)Individual code channel averages, and obtains u channel.
7. iterative joint detection and decoding system with interference eliminated, it is characterized in that, comprise a coding, interweave and modulate/spread spectrum module, an arrester, a detector and a demodulation, deinterleaving and decoder module, be used to reduce the intersymbol interference of signal generation; Wherein:
Described coding, interweave and modulate/spread spectrum module, be used for the last user data that will decode from described demodulation, deinterleaving and decoder module, encode, interweave and modulate/spread spectrum,, be used for carrying out to received signal interference eliminated to generate active user's burst;
Described arrester is used for the described burst of received signal subduction in the current time slots;
Described detector is used for joint-detection through remaining user data after the described arrester subduction;
Described demodulation, deinterleaving and decoder module, be used for the detected symbol of extracting is carried out demodulation, deinterleaving, and decode active user's data, be used to return described coding, interweave and modulate/spread spectrum module to be to generate burst, decodes needed user data until described demodulation, deinterleaving and decoder module.
8. system according to claim 7, it is characterized in that described system also comprises a channel estimating/average module, be positioned at the front end of described detector, be used for carrying out earlier to received signal carrying out the average processing of channel after the channel estimating, to improve accuracy of channel estimation.
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| CN112787758A (en) * | 2021-01-15 | 2021-05-11 | 北京理工大学 | Serial interference elimination uplink multiple access system of mass medium modulation equipment |
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