V-OFDM: On Performance Limits over Multi-Path Rayleigh Fading Channels

V-OFDM: On Performance Limits over Multi-Path Rayleigh Fading Channels
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V-OFDM:论多径瑞利衰落信道的性能限制

DOI:
10.1109/tcomm.2011.051711.100223
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发表时间:
2011-05
影响因子:
8.3
通讯作者:
Zhang, Wenjun
Zhang, Wenjun
中科院分区:
计算机科学2区
文献类型:
--
作者:
Cheng, Peng;Tao, Meixia;Xiao, Yue;Zhang, Wenjun

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矢量OFDM(V-OFDM)作为连接正交频分复用(OFDM)和单载波频域均衡(SC-FDE)技术的桥梁,为系统设计提供了极大的灵活性。本文对多径衰落信道下的V-OFDM系统进行了分析研究。我们的目标是研究V-OFDM中每个矢量块(VB)的分集增益和编码增益,从而最终揭示其在衰落信道下的性能极限。利用代数数论工具,首次严格证明了V-OFDM中绝大多数VB都能实现min {M,G}的分集增益,其中M为每个VB的长度,G为信道抽头总数。此外,一些特定的VB,其长度等于信道抽头的总数,不仅可以收获最大的分集增益,但也实现了最大的编码增益。它进一步表明,即使VB无法受益于额外的分集增益时,M超过G,他们可以享受显着增加的编码增益。我们的分析得出的结论是,它是优选的选择的VB的长度等于信道抽头的数量,在考虑到整体系统性能和计算复杂度。
As a bridge of connecting orthogonal frequency division multiplexing (OFDM) with single-carrier frequency domain equalization (SC-FDE) techniques, Vector OFDM (V-OFDM) provides significant flexibility in system design. This paper presents an analytical study of V-OFDM over multi-path fading channels. Our goal is to investigate the diversity gain and coding gain of each vector block (VB) in V-OFDM so as to ultimately reveal its performance limits over fading channel. By using algebraic number theory tools, we rigorously prove for the first time that a majority of VBs in V-OFDM can surely realize the diversity gain of min {M,G} , where M is the length of each VB, and G is the total number of channel taps. Furthermore, some specific VBs, whose length equals the total number of channel taps, can not only harvest the maximum diversity gain but also achieve the maximum coding gain. It is further demonstrated that, even though VBs fail to benefit from additional diversity gain when M exceeds G, they can enjoy significantly increased coding gains. Our analysis concludes that it is preferable to choose the length of VBs to be equal to the number of channel taps in consideration of both overall system performance and computational complexity.
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