J4 ›› 2011, Vol. 38 ›› Issue (4): 143-147+180.doi: 10.3969/j.issn.1001-2400.2011.04.026

• 研究论文 • 上一篇    下一篇

采用LDPC码的8PSK调制编码协作方法

李琳;袁超伟;田心记   

  1. (北京邮电大学 信息与通信工程学院,北京  100876)
  • 收稿日期:2010-06-30 出版日期:2011-08-20 发布日期:2011-09-28
  • 通讯作者: 李琳
  • 作者简介:李琳(1982-),女,北京邮电大学博士研究生,E-mail: lipbupt@gmail.com.
  • 基金资助:

    国家自然科学基金资助项目(60872149)

Cooperative communication scheme with 8PSK modulation constellations using LDPC codes

LI Lin;YUAN Chaowei;TIAN Xinji   

  1. (School of Info. and Comm. Eng., Beijing Univ. of Posts and Telecomm., Beijing  100876, China)
  • Received:2010-06-30 Online:2011-08-20 Published:2011-09-28
  • Contact: LI Lin

摘要:

为了提高编码协作系统的频谱资源利用率,并有效地利用LDPC码,提出了一种更高效的编码协作方法.该方法以两用户为例,在两次发送数据的时隙中都采用8PSK调制,使用混合自动重传方式(HARQ),在第1时隙对接收端不能正确译码的数据进行存储,并与下一次发送来的数据进行联合译码,通过增加数据的冗余信息来提高编码协作系统第1时隙传送数据的译码准确率,直到第1时隙传送的数据可以正确译码为止.在第2时隙传送其协作用户的冗余信息比特,从而实现发送分集.性能分析和仿真结果表明,当协作用户间信道的信噪比为0dB,误码率为10-3时,与非协作方案和普通的编码协作方案相比较,所提出的编码协作方案在瑞利块衰落信道下可以获得约5dB和3dB的性能增益.

关键词: LDPC, 编码协作, 8PSK调制, 混合自动重传, 分集

Abstract:

A new coded cooperation scheme with 8PSK modulation using LDPC codes is proposed for high spectral efficiency. Two users in the cooperative process transmit the data using 8PSK modulation over two frames. The transmitted information is stored if it is not decoded correctly by the cooperative partner over the first frame based on HARQ, and then the stored information and the next transmitted information are together decoded by the cooperative partner until the transmitted information over the first frame is decoded successfully, which improves the accuracy of decode due to adding parity information. Then the parity information of his cooperation partner is transmitted over the second frame for diversity. Analysis and simulation results show that the proposed method outperforms the no coded cooperation method and conventional coded cooperation method by benefit of 5dB and 3dB in the Raleigh block channel when the interuser channel has an SNR of 0dB and its BER is 10-3.

Key words: LDPC, coded cooperation, 8PSK modulation, HARQ, diversity