一种数据包合并跨层优化编码方案
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摘要
在传统分层系统中,信息数据包首先在数据链路层进行数据包级的检错码编码,然后一个数据包对应一个信息分组在物理层进行符号级的纠错码编码,最后送入信道中传输。为提高系统的传输效率,提出了一种基于数据包合并的物理层与数据链路层编码的跨层优化方案,即数据链路层的多个数据包合并对应物理层的一个信息分组,然后进行纠错编码后再传输。通过理论推导得出了使系统传输效率最大的最优合并数据包个数和数据包长度表达式。通过仿真验证了理论推导的正确性,并与传统方案进行了比较,结果表明,该方案能有效提高系统的传输效率。
In a conventional layered system,data packets are firstly encoded by packet-level error detection code in the data link layer. Then a data packet corresponding to an information block is encoded by symbol-level error correction code in the physical layer. Finally,the data packets are transmitted in channels. In order to improve the transmission efficiency of system,this paper proposes a cross-layer optimization scheme of the physical layer and data link layer coding based on data packets merge. Namely multiple packets of data link layer merge and correspond to an information block of the physical layer,and then transmit after error correction coding. Furthermore,through theoretical deduction,the optimal number of merging packets and the best length of each packet are computed analytically when the transmission efficiency of system is maximal.Simulation results verify the accuracy of theoretical analysis,and show that the proposed scheme significantly improves the transmission efficiency of system compared with traditional scheme.
In a conventional layered system,data packets are firstly encoded by packet-level error detection code in the data link layer. Then a data packet corresponding to an information block is encoded by symbol-level error correction code in the physical layer. Finally,the data packets are transmitted in channels. In order to improve the transmission efficiency of system,this paper proposes a cross-layer optimization scheme of the physical layer and data link layer coding based on data packets merge. Namely multiple packets of data link layer merge and correspond to an information block of the physical layer,and then transmit after error correction coding. Furthermore,through theoretical deduction,the optimal number of merging packets and the best length of each packet are computed analytically when the transmission efficiency of system is maximal.Simulation results verify the accuracy of theoretical analysis,and show that the proposed scheme significantly improves the transmission efficiency of system compared with traditional scheme.
引文
[1]Lin S,Costello D J.差错控制编码[M].晏坚,何元智,潘亚汉,等,译.北京:机械工业出版社,2007.Lin S,Costello D J.Error control coding[M].Translated by YAN Jian,HE Yuanzhi,PAN Yahan,et al.Beijing:China Machine Press,2007.(in Chinese)
[2]Moghaddam M S,Khalaj B H,Pasandshanjani E.Crosslayer rateless coding over wireless relay network[C]//Proceedings of 2011 International Wireless Communications and Mobile Computing Conference.Istanbul:IEEE,2011:1545-1549.
[3]Berger C R,Zhou S L,Wen Y G,et al.Optimizing joint erasure-and error-correction coding for wireless packettransmissions[J].IEEE Transactions on Wireless Commu nications,2008,7(11):4586-4595.
[4]Courtade T A,Wesel R D.A cross-layer perspective onrateless coding for wireless channels[C]//Proceedings of2009 IEEE International Conference on Communications.Dresden:IEEE,2009:1-6.
[5]Wang Y,Lei W J,Xie X Z.An H-ARQ transmission scheme based on rateless code[C]//Proceedings of2013 International Symposium on Computational Intelligence and Design.Hangzhou:IEEE,2013:201-204.
[6]杨静,朱春华,王珂.多跳分集系统中一种新的基于无比率编码的跨层方案[J].电讯技术,2012,52(4):492-496.YANG Jing,ZHU Chunhua,WANG Ke.Cross-layer design based on rateless codes in multihop diversity systems[J].Telecommunications Engineering,2012,52(4):492-496.(in Chinese)
[7]李金磊.OFDM/MIMO-OFDM系统中HARQ合并技术研究[D].湖南:国防科学技术大学,2011.LI Jinlei.Research of HARQ combining techniques in OFDM and MIMO-OFDM systems[D].Hunan:National University of Defense Technology,2011.(in Chinese)
[8]魏岳军.通过合并数据包改变交织长度的信息重传方法:中国,01117760.8[P].2002-12-18.WEI Yuejun.A retransmission method of changing interleave length by merging data packets:China,01117760.8[P].2002-12-18.(in Chinese)
[9]Mitra A.A PHY-MAC cross layer design for low PER with adaptive modulation and coding[C]//Proceedings of 2010 International Workshop on Cognitive Radio.Bangalore:IEEE,2010:1-5.
[10]Gallager R G.Low-density parity-check codes[J].IRE Transactions on Information Theory,1962,8(1):21-28.
[2]Moghaddam M S,Khalaj B H,Pasandshanjani E.Crosslayer rateless coding over wireless relay network[C]//Proceedings of 2011 International Wireless Communications and Mobile Computing Conference.Istanbul:IEEE,2011:1545-1549.
[3]Berger C R,Zhou S L,Wen Y G,et al.Optimizing joint erasure-and error-correction coding for wireless packettransmissions[J].IEEE Transactions on Wireless Commu nications,2008,7(11):4586-4595.
[4]Courtade T A,Wesel R D.A cross-layer perspective onrateless coding for wireless channels[C]//Proceedings of2009 IEEE International Conference on Communications.Dresden:IEEE,2009:1-6.
[5]Wang Y,Lei W J,Xie X Z.An H-ARQ transmission scheme based on rateless code[C]//Proceedings of2013 International Symposium on Computational Intelligence and Design.Hangzhou:IEEE,2013:201-204.
[6]杨静,朱春华,王珂.多跳分集系统中一种新的基于无比率编码的跨层方案[J].电讯技术,2012,52(4):492-496.YANG Jing,ZHU Chunhua,WANG Ke.Cross-layer design based on rateless codes in multihop diversity systems[J].Telecommunications Engineering,2012,52(4):492-496.(in Chinese)
[7]李金磊.OFDM/MIMO-OFDM系统中HARQ合并技术研究[D].湖南:国防科学技术大学,2011.LI Jinlei.Research of HARQ combining techniques in OFDM and MIMO-OFDM systems[D].Hunan:National University of Defense Technology,2011.(in Chinese)
[8]魏岳军.通过合并数据包改变交织长度的信息重传方法:中国,01117760.8[P].2002-12-18.WEI Yuejun.A retransmission method of changing interleave length by merging data packets:China,01117760.8[P].2002-12-18.(in Chinese)
[9]Mitra A.A PHY-MAC cross layer design for low PER with adaptive modulation and coding[C]//Proceedings of 2010 International Workshop on Cognitive Radio.Bangalore:IEEE,2010:1-5.
[10]Gallager R G.Low-density parity-check codes[J].IRE Transactions on Information Theory,1962,8(1):21-28.