一種改進基于門限的稀疏碼多址接入低復雜度多用戶檢測算法

楊維; 趙懿偉; 侯健琦

doi:10.11999/JEIT170647

一種改進基于門限的稀疏碼多址接入低復雜度多用戶檢測算法

doi: 10.11999/JEIT170647

基金項目:

國家重點研發(fā)計劃(2016YFC0801800)，國家自然科學基金(51474015)

計量
- 文章訪問數(shù): 1137
- HTML全文瀏覽量: 120
- PDF下載量: 168
- 被引次數(shù): 0
出版歷程
- 收稿日期: 2017-07-05
- 修回日期: 2017-12-08
- 刊出日期: 2018-05-19

An Improved Threshold-based Low Complexity Multiuser Detection Scheme for Sparse Code Multiple Access System

Funds:

The National Key Research and Development Program of China (2016YFC0801800), The National Natural Science Foundation of China (51474015)

摘要

摘要: 稀疏碼多址接入(Sparse Code Multiple Access, SCMA)作為一種基于多維碼本的非正交多址技術(shù)，能有效滿足5G的巨連接、高頻譜效率和毫秒級時延需求。針對基于門限的消息傳遞算法(Message Passing Algorithm, MPA)存在低門限時誤比特率(Bit Error Rate, BER)較高的問題，該文提出一種改進的SCMA多用戶檢測算法。所提出的算法在基于門限MPA的基礎(chǔ)上，增加了對用戶節(jié)點穩(wěn)定性必要條件的判決，即只有符合門限條件并通過用戶節(jié)點穩(wěn)定性必要條件判決的用戶才能被提前解碼。這提高了提前判決碼字的可靠性并減少了因變相硬判的檢測機制造成的后驗軟信息損失。與基于門限的MPA相比，所提出的算法可使消息在低門限時迭代得更加充分，從而在低門限時仍然能夠使SCMA用戶獲得較好的BER性能。仿真結(jié)果表明，在低門限時采用該文所提出的算法SCMA用戶BER性能明顯好于僅采用基于門限的MPA的BER性能。
- 稀疏碼多址接入 /
- 多用戶檢測 /
- 消息傳遞算法 /
- 門限
Abstract: Sparse Code Multiple Access (SCMA) is a non-orthogonal multiple access technology based on multi-dimensional codebook, which can effectively address challenges in 5G such as massive connectivity, high spectral efficiency and millisecond delay. For the problem that threshold-based Message Passing Algorithm (MPA) has a high Bit Error Rate (BER) when the threshold is low, an improved SCMA multiuser detection scheme is proposed in this paper. Based on the threshold MPA scheme, the proposed scheme adds a judgment on the necessary conditions of user node stability. The users who not only satisfy the threshold criterion but also pass the judgment on the necessary conditions of user node stability can be decoded in advance. This improves the reliability of codeword which is judged in advance and reduces the loss of posterior soft information caused by the detection mechanism similar to the hard decision. Compared with the threshold-based MPA scheme, the proposed scheme allows the messages to be iterated more fully at low thresholds, which makes SCMA users achieve better BER performance at low thresholds. The simulation results show that better BER performance is achieved with the proposed scheme than that with the threshold-based MPA scheme for SCMA users.
- Sparse Code Multiple Access (SCMA) /
- Multiuser detection /
- Message Passing Algorithm (MPA) /
- Threshold

HTML全文

參考文獻(18)

DAI Linglong, WANG Bichai, YUAN Yifei, et al. Non- orthogonal multiple access for 5G: solutions, challenges, opportunities, and future research trends[J]. IEEE Communications Magazine, 2015, 53(9): 74-81. doi: 10.1109/ MCOM.2015.7263349.

張平, 陶運錚, 張治. 5G若干關(guān)鍵技術(shù)評述[J]. 通信學報, 2016, 37(7): 15-29. doi: 10.11959/j.issn.1000-436x.2016130.

ZHANG Ping, TAO Yunzheng, and ZHANG Zhi. Survey of several key technologies for 5G[J]. Journal on Communications, 2016, 37(7): 15-29. doi: 10.11959/j.issn. 1000-436x.2016130.

DONG Lei, ZHAO Hongyi, CHEN Yan, et al. Introduction on IMT-2020 5G trials in China[J]. IEEE Journal on Selected Areas in Communications, 2017, 35(8): 1849-1866. doi: 10.1109/JSAC.2017.2710678.

CHEN Yan, BAYESTEH Alireza, WU Yiqun, et al. SCMA: A promising non-orthogonal multiple access technology for 5G networks[C]. 2016 IEEE 84th Vehicular Technology Conference (VTC-Fall), Montreal, Canada, 2016: 1-6. doi: 10.1109/VTCFall.2016.7881213.

HOSHYAR R, WATHAN F P, and TAFAZOLLI R. Novel low-density signature for synchronous CDMA systems over AWGN channel[J]. IEEE Transactions on Signal Processing, 2008, 56(4): 1616-1626. doi: 10.1109/TSP.2007.909320.

BEEK J V D and POPOVIC B M. Multiple access with low-density signatures[C]. IEEE Global Telecommunications Conference, Honolulu, USA, 2009: 1-6. doi: 10.1109/ GLOCOM.2009.5425243.

HOSHYAR R, RAZAVI R, and AL-IMARI M. LDS-OFDM an efficient multiple access technique[C]. 2010 IEEE 71st IEEE Vehicular Technology Conference (VTC 2010-Spring), Taipei, 2010: 1-5. doi: 10.1109/VETECS.2010.5493941.

NIKOPOUR H and BALIGH H. Sparse code multiple access[C]. 2013 IEEE 24th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC), London, UK, 2013: 332-336. doi: 10.1109/PIMRC. 2013.6666156.

TAHERZADEH M, NIKOPOUR H, BAYESTECH A, et al. SCMA codebook design[C]. IEEE Vehicular Technology Conference Fall, Vancouver, Canada, 2014: 14-17. doi: 10.1109/VTCFall.2014.6966170.

廉晉, 周世東, 張秀軍, 等. 超蜂窩架構(gòu)下基于跳碼的SCMA控制信道接入設(shè)計[J]. 中國科學:信息科學, 2017, 47(6): 789-799. doi: 10.1360/N112017-00038.

LIAN Jin, ZHOU Shidong, ZHANG Xiujun, et al. An SCMA control channel accessing scheme based on codebook-hopping under hyper-cellular network architecture[J]. Scientia Sinica (Informationis), 2017, 47(6): 789-799. doi: 10.1360/ N112017-00038.

KSCHISCHANG F R, FREY B J, and LOELIGER H. Factor graphs and the sum-product algorithm[J]. IEEE Transactions on Information Theory, 2001, 47(2): 498-519. doi: 10.1109 /18.910572.

YANG Lin, LIU Yunyun, and SIU Yunming. Low complexity message passing algorithm for SCMA system[J]. IEEE Communications Letters, 2016, 20(12): 2466-2469. doi: 10.1109/LCOMM.2016.2609382.

XIAO Kexin, XIAO Baicen, ZHANG Shutian, et al. Simplified multiuser detection for SCMA with sum-product algorithm[C]. 2015 International Conference on Wireless Communications Signal Processing (WCSP), Nanjing, China, 2015: 1-5. doi: 10.1109/WCSP.2015.7341328.

DU Yang, DONG Binhong, CHEN Zhi, et al. A fast convergence multiuser detection scheme for uplink SCMA systems[J]. IEEE Wireless Communications Letters, 2016, 5(4): 388-391. doi: 10.1109/LWC.2016.2565581.

杜洋, 董彬虹, 王顯俊, 等. 基于串行策略的SCMA多用戶檢測算法[J]. 電子與信息學報, 2016, 38(8): 1888-1893. doi: 10.11999/JEIT151259.

DU Yang, DONG Binhong, WANG Xianjun, et al. Multiuser detection scheme for SCMA systems based on serial strategy[J]. Journal of Electronics Information Technology, 2016, 38(8): 1888-1893. doi: 10.11999/JEIT151259.

相關(guān)文章

施引文獻

資源附件(0)

訪問統(tǒng)計