Pre-DFT combining space diversity assisted COFDM

被引:64
作者
Okada, M [1 ]
Komaki, S
机构
[1] Nara Inst Sci & Technol, Grad Sch Informat Sci, Nara, Japan
[2] Osaka Univ, Fac Engn, Osaka, Japan
关键词
coded orthogonal frequency-division multiplexing (COFDM); complexity; diversity; multicarrier; multipath fading;
D O I
10.1109/25.923060
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
A new pre-discrete Fourier transformation (DFT) combining diversity receiver is proposed for coded orthogonal frequency-division multiplexing systems and investigated in a frequency-selective fading channel. Although the post-DFT combining space diversity receiver is optimum in terms of maximizing the signal-to-noise ratio (SNR) after combining, it requires am increased number of DFT processors, which increases the computational complexity, Since the proposed pre-DFT combining receiver requires only one DFT processor, while achieving space diversity gain, the proposed scheme can drastically reduce the computational complexity. This paper derives the optimum diversity weights for the proposed receiver analytically, in order Ito maximize the SNR after combining. Computer simulation results show that the proposed scheme can reduce the computational complexity by tolerating a slight performance degradation.
引用
收藏
页码:487 / 496
页数:10
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