适用于大气弱湍流信道的自适应码率极化码
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摘要
为了提高光通信链路在大气弱湍流信道下的解码性能和传输效率,基于极化码的信息位嵌套特性,设计了一种自适应码率极化码。该码字在弱湍流信道中能充分地极化,纠错效果较好。为了调节码率,引入CRC校验码作为发送端的停止标志,逐次发送更低码率的码字直到译码结果通过校验,此时的码字码率即是保证可靠传输的最大码率。不同湍流强度下的仿真结果表明,在误帧率为10~(-8)时,相比传统极化码,自适应码率极化码可以获得1.7～2.3 d B的性能增益。对自适应码率极化码的时延进行了仿真分析,并结合误帧率得到了自适应码率极化码的信息吞吐率,结果表明,在弱湍流信道中,自适应码率极化码的信息吞吐率能满足FSO的传输需求。
To improve the decoding performance and transmission efficiency of optical communication link in atmospheric weak turbulence channel, heuristic adaptive rate polar codes were proposed. Adaptive rate polar codes were designed based on nesting property of information bits of polar codes, which could achieve fully polarization and good error-correcting performance in atmospheric weak turbulence channel.To adjust the code rate of adaptive rate polar codes, cyclic redundancy check(CRC) code was introduced as stop signs, which could check decoding result. Transmitting terminal sent a set of codes with gradually lower code rates, when the received codes passed CRC check, transmitting terminal stopped and the rate of such code was the largest rate which can ensure reliable transmission. Simulation results show that,compared to traditional polar codes, adaptive rate polar codes can obtain 1.7 d B to 2.3 dB coding gain at the frame error rate(FER) of 10~(-8) in different atmospheric turbulence intensity. Decoding latency of adaptive rate polar codes was simulated and the throughput rate of adaptive rate polar codes was calculated. The results show that adaptive rate polar codes can meet the transmission requirements of FSO in atmospheric weak turbulence channel.
To improve the decoding performance and transmission efficiency of optical communication link in atmospheric weak turbulence channel, heuristic adaptive rate polar codes were proposed. Adaptive rate polar codes were designed based on nesting property of information bits of polar codes, which could achieve fully polarization and good error-correcting performance in atmospheric weak turbulence channel.To adjust the code rate of adaptive rate polar codes, cyclic redundancy check(CRC) code was introduced as stop signs, which could check decoding result. Transmitting terminal sent a set of codes with gradually lower code rates, when the received codes passed CRC check, transmitting terminal stopped and the rate of such code was the largest rate which can ensure reliable transmission. Simulation results show that,compared to traditional polar codes, adaptive rate polar codes can obtain 1.7 d B to 2.3 dB coding gain at the frame error rate(FER) of 10~(-8) in different atmospheric turbulence intensity. Decoding latency of adaptive rate polar codes was simulated and the throughput rate of adaptive rate polar codes was calculated. The results show that adaptive rate polar codes can meet the transmission requirements of FSO in atmospheric weak turbulence channel.
引文
[1]Gao Duorui,Li Tianlun,Sun Yue,et al.Latest developments and trends of space laser communication[J].Chinese Optics,2018,11(6):901-913.(in Chinese)
[2]Nan Hang,Zhang Peng,Tong Shoufeng,et al.Analysis and optimization of splitting performance for space optical hybrid[J].Optics and Precision Engineering,2017,25(7):1748-1756.(in Chinese)
[3]Ke Xizheng,Kang Ye,Liu Juan.Experimental research on PAPR reduction algorithms in FSO-OFDM system[J].Infrared and Laser Engineering,2017,46(6):0622001.(in Chinese)
[4]Wang Yi,Yang Shuai,Ma Jing,et al.Performance analysis of coherent OFDM system in free space optical communication[J].Infrared and Laser Engineering,2016,45(7):0722003.(in Chinese)
[5]Ohtsuki T.Turbo-coded atmospheric optical communication systems[C]//IEEE International Conference on Communications,2002,5:2938-2942.
[6]Chen Dan,Ke Xizheng.Analysis on error rate of wireless optical communication using subcarrier modulation on turbo code[J].Acta Optica Sinica,2010,30(10):2859-2863.(in Chinese)
[7]Ivan B Djordjevic.LDPC-coded MIMO optical communication over the atmospheric turbulence channel using Q-ary pulse-position modulation[J].Opt Express,2007,15:10026-10032.
[8]Wang Huiqin,Wang Fen,Cao Minghua,et al.A joint detection and iterative decoding algorithm of optical concatenated space-time code[J].Acta Optica Sinica,2015,35(8):57-63.(in Chinese)
[9]Cao M H,Wang H Q,Huang R,et al.BER performance of layered space time code in FSO[J].Infrared and Laser Engineering,2012,41(7):1842-1847.(in Chinese)
[10]Tahir B,Rupp M.New construction and performance analysis of Polar codes over AWGN channels[C]//201724th International Conference on Telecommunications(ICT),2017:1-4.
[11]Niu K,Chen K,Lin J R.Improved successive cancellation decoding of polar codes[J].IEEETransactions on Communications,2013,61(8):3100-3107.
[12]R1-1701552.Final report of 3GPP TSG RAN WG1#87v1.0.0[S].Reno:Proceedings of the 3GPP TSG RANWG1 Meeting#87,2016.
[13]Eslami A,Pishro-Nik H.A practical approach to polar codes[C]//IEEE International Symposium on Information Theory Proceeding,2011,42(4):16-20.
[14]Wang R,Liu R.A novel puncturing scheme for polar codes[J].IEEE Communications Letters,2014,18(12):2081-2084.
[15]Shao J H,Ke X Zh,Chen Q.A suitable polar coding modulation scheme for atmospheric weak turbulence channel[J].Acta Electronica Sinica,2016,8:1831-1836.(in Chinese)
[16]Hong S N,Hui D,Mari c'I.Capacity-achieving ratecompatible polar codes[C]//IEEE International Symposium on Information Theory.IEEE,2016:41-45.
[17]Sasoglu E,Wang L.Universal polarization[J].IEEETransactions on Information Theory,2013,62(6):2937-2946.
[18]Jaiswal A,Bhatnagar M R,Jain V K.Performance evaluation of space shift keying in free-space optical communication[J].IEEE/OSA Journal of Optical Communications&Networking,2017,9(2):149-160.
[19]Nor N A M,Ghassemlooy Z,Bohata J,et al.Experimental investigation of all-optical relay-Assisted10 Gb/s FSO link over the atmospheric turbulence channel[J].Journal of Lightwave Technology,2017,35(1):45-53..
[20]Saber M J,Sadough S M S.On secure free-space optical communications over málaga turbulence channels[J].IEEE Wireless Communications Letters,2017,6(99):1-1.
[21]Giard P,Sarkis G,Thibeault C,et al.Fast software polar decoders[C]//2014 IEEE International Conference on Acoustics,Speech and Signal Processing(ICASSP),Florence,2014:7555-7559.
[22]Ke Xizheng,Lei Sichen,Shao Junhu,et al.Analysis on error rate of wireless optical communication using subcarrier modulation based on polar code[J].Infrared and Laser Engineering,2015,44(6):1849-1853.(in Chinese)
[2]Nan Hang,Zhang Peng,Tong Shoufeng,et al.Analysis and optimization of splitting performance for space optical hybrid[J].Optics and Precision Engineering,2017,25(7):1748-1756.(in Chinese)
[3]Ke Xizheng,Kang Ye,Liu Juan.Experimental research on PAPR reduction algorithms in FSO-OFDM system[J].Infrared and Laser Engineering,2017,46(6):0622001.(in Chinese)
[4]Wang Yi,Yang Shuai,Ma Jing,et al.Performance analysis of coherent OFDM system in free space optical communication[J].Infrared and Laser Engineering,2016,45(7):0722003.(in Chinese)
[5]Ohtsuki T.Turbo-coded atmospheric optical communication systems[C]//IEEE International Conference on Communications,2002,5:2938-2942.
[6]Chen Dan,Ke Xizheng.Analysis on error rate of wireless optical communication using subcarrier modulation on turbo code[J].Acta Optica Sinica,2010,30(10):2859-2863.(in Chinese)
[7]Ivan B Djordjevic.LDPC-coded MIMO optical communication over the atmospheric turbulence channel using Q-ary pulse-position modulation[J].Opt Express,2007,15:10026-10032.
[8]Wang Huiqin,Wang Fen,Cao Minghua,et al.A joint detection and iterative decoding algorithm of optical concatenated space-time code[J].Acta Optica Sinica,2015,35(8):57-63.(in Chinese)
[9]Cao M H,Wang H Q,Huang R,et al.BER performance of layered space time code in FSO[J].Infrared and Laser Engineering,2012,41(7):1842-1847.(in Chinese)
[10]Tahir B,Rupp M.New construction and performance analysis of Polar codes over AWGN channels[C]//201724th International Conference on Telecommunications(ICT),2017:1-4.
[11]Niu K,Chen K,Lin J R.Improved successive cancellation decoding of polar codes[J].IEEETransactions on Communications,2013,61(8):3100-3107.
[12]R1-1701552.Final report of 3GPP TSG RAN WG1#87v1.0.0[S].Reno:Proceedings of the 3GPP TSG RANWG1 Meeting#87,2016.
[13]Eslami A,Pishro-Nik H.A practical approach to polar codes[C]//IEEE International Symposium on Information Theory Proceeding,2011,42(4):16-20.
[14]Wang R,Liu R.A novel puncturing scheme for polar codes[J].IEEE Communications Letters,2014,18(12):2081-2084.
[15]Shao J H,Ke X Zh,Chen Q.A suitable polar coding modulation scheme for atmospheric weak turbulence channel[J].Acta Electronica Sinica,2016,8:1831-1836.(in Chinese)
[16]Hong S N,Hui D,Mari c'I.Capacity-achieving ratecompatible polar codes[C]//IEEE International Symposium on Information Theory.IEEE,2016:41-45.
[17]Sasoglu E,Wang L.Universal polarization[J].IEEETransactions on Information Theory,2013,62(6):2937-2946.
[18]Jaiswal A,Bhatnagar M R,Jain V K.Performance evaluation of space shift keying in free-space optical communication[J].IEEE/OSA Journal of Optical Communications&Networking,2017,9(2):149-160.
[19]Nor N A M,Ghassemlooy Z,Bohata J,et al.Experimental investigation of all-optical relay-Assisted10 Gb/s FSO link over the atmospheric turbulence channel[J].Journal of Lightwave Technology,2017,35(1):45-53..
[20]Saber M J,Sadough S M S.On secure free-space optical communications over málaga turbulence channels[J].IEEE Wireless Communications Letters,2017,6(99):1-1.
[21]Giard P,Sarkis G,Thibeault C,et al.Fast software polar decoders[C]//2014 IEEE International Conference on Acoustics,Speech and Signal Processing(ICASSP),Florence,2014:7555-7559.
[22]Ke Xizheng,Lei Sichen,Shao Junhu,et al.Analysis on error rate of wireless optical communication using subcarrier modulation based on polar code[J].Infrared and Laser Engineering,2015,44(6):1849-1853.(in Chinese)