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增强型MBMS系统中应用空时频编码的传输分集策略

DOI: 10.13190/jbupt.200801.125.074, PP. 125-129

Keywords: 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

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Abstract:

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.

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