北京邮电大学学报

  • EI核心期刊

北京邮电大学学报 ›› 2008, Vol. 31 ›› Issue (1): 125-129.doi: 10.13190/jbupt.200801.125.074

• 研究报告 • 上一篇    下一篇

增强型MBMS系统中应用空时频编码的传输分集策略

盛 煜, 彭木根, 王文博   



  1. (北京邮电大学 电信工程学院, 北京 100876)
  • 收稿日期:2007-05-24 修回日期:1900-01-01 出版日期:2008-02-28 发布日期:2008-02-28
  • 通讯作者: 盛 煜

A Transmit Diversity Strategy with Space-Time-Frequency Coding Technique in Enhanced MBMS Networks

SHENG Yu, PENG Mu-gen, WANG Wen-bo   


  1. (School of Telecommunication Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China)
  • Received:2007-05-24 Revised:1900-01-01 Online:2008-02-28 Published:2008-02-28
  • Contact: SHENG Yu

摘要:

结合空时编码和循环延迟分集技术,将空时频编码引入增强-多媒体广播/组播业务(E-MBMS)网络中,提出了一种有效的传输分集策略.该策略对广播/组播网络下的不同小区进行分组,对本小区内正交频分复用(OFDM)帧间相同载波上的符号进行空时编码;不同分组的小区在相同OFDM帧内的各子载波符号则使用循环延迟方案引入频率分集,从而实现E-MBMS网络下的空时频编码.仿真结果表明,该策略可以明显改善小区边界用户的接收性能,有效的提高移动广播/组播网络的覆盖能力及吞吐量.

关键词: 增强-多媒体广播/组播业务, 空时编码, 循环延迟分集, 正交频分复用

Abstract:

A transmit diversity strategy in enhanced multimedia broadcast/multicast service (E-MBMS) networks was proposed, in which the space-time-frequency coding technique was adopted, i.e., the frequency diversity and the cyclic delay diversity were jointly designed to enhance the traditional space-time coding scheme. The broadcast/multicast cells in the proposal were divided into multiple cell groups. And the orthogonal frequency division multiplexing (OFDM) symbols in the same cell between different frames were executed with space-time coding schemes, Meanwhile, the proper cyclic delay was obtained to the frequency diversity gain in the different cell groups. Simulation results show that the proposal can improve the bit error rate performances efficiently and get increasing of coverage and throughput, especially for those users who are at the cell edges.

Key words: enhanced multimedia broadcast/multicast service, space-time coding, cyclic delay diversity, orthogonal frequency division multiplexing

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