全部 标题 作者
关键词 摘要

OALib Journal期刊
ISSN: 2333-9721
费用:99美元

查看量下载量

相关文章

更多...

提高多址接入性能的功率与LDPC码的优化设计

DOI: 10.13190/jbupt.201104.56.zhangjx, PP. 56-60

Keywords: 多址接入信道,低密度校验阵码,高斯近似,交织多址,功率分配,码优化

Full-Text   Cite this paper   Add to My Lib

Abstract:

为了逼近多址接入信道的容量限,对功率与低密度校验阵(LDPC)码的度分布进行了优化.基于互信息最大化准则设计了功率分配算法,并得出分配方案,利用高斯近似来近似取得因子图上消息的概率密度函数,得到功率分配条件下优化的LDPC码的度分布.采用迭代的检测与译码算法进行多址干扰的消除.仿真结果表明,经功率和LDPC码优化后的误码性能在误码率为10-5时比等功率只优化LDPC码度分布时的性能提升了16dB.

References

[1]  Li Ping, Liu Lihai, Wu Keying, et al. Interleave-division multiple-access[J]. Wireless Communication, IEEE Transactions on, 2006, 5(4): 938-947.
[2]  章翔,别志松,吴伟陵. 用于多址接入信道的LDPC码优化设计[J]. 北京邮电大学学报, 2008, 31(3): 9-12. Zhang Xiang, Bie Zhisong, Wu Weiling. LDPC optimization for multiple access channel[J]. Journal of Beijing University of Posts and Telecommunications, 2008, 31(3): 9-12.
[3]  Ma Xiao, Li Ping. Coded modulation using superimposed binary codes[J]. Information Theory, IEEE Transactions on, 2004, 50(12): 3331-3343.
[4]  Wang Peng, Li Ping, Liu Lihai. Power allocation for multiple access systems with practical coding and iterative multi-user detection//IEEE, ICC’06. Istanbul, Turkey: , 2006: 4971-4976.
[5]  Chung S, Richardson T, Urbanke R. Analysis of sum-product decoding of low-density parity-check codes using a Gaussian approximation[J]. Information Theory, IEEE Transactions on, 2001, 47(2): 657-670.
[6]  Berrou C, Glavieux A. Near optimum error correcting coding and decoding: Turbo-codes[J]. Communications, IEEE Transactions on, 1996, 44(10): 1261-1271.
[7]  Zhang X, Bie Z, Wu W, et al. Boosts to LDPC-coded IDMA system[J]. IET Electronic Letters, 2008, 44(4): 306-307.
[8]  Wachsmann U, Fischer R, Huber J. Multilevel codes: theoretical concepts and practical design rules[J]. Information Theory, IEEE Transactions on, 1999, 45(5): 1361-1391.

Full-Text

Contact Us

service@oalib.com

QQ:3279437679

WhatsApp +8615387084133