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OFDM多跳中继系统的子载波功率分配

DOI: 10.13190/jbupt.200802.59.099, PP. 59-63

Keywords: 协作传输,功率分配,子载波对,等效信道增益

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Abstract:

针对非再生和再生两种中继方式,研究了宽带正交频分复用(OFDM)中继系统的子载波功率分配问题。首先在2跳非再生中继方式基础上,推导并给出了2跳再生中继方式下的等效信道增益;然后利用注水定理在子载波对间进行功率分配;最后把上述结论推广到多跳中继系统中。仿真结果表明,相比直传系统和平均功率分配机制,最优功率分配的OFDM中继系统有明显的容量增益,且多跳中继系统能有效扩大覆盖范围。

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