线性预编码或编码OFDM对无线信道淡出?

2001 IEEE Third Workshop on Signal Processing Advances in Wireless Communications (SPAWC'01). Workshop Proceedings (Cat. No.01EX471) Pub Date : 2001-03-20 DOI:10.1109/SPAWC.2001.923899

Zhengdao Wang, G. Giannakis

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引用次数: 160

摘要

正交频分复用(OFDM)将色散信道转换成并行子信道，从而便于均衡。但是当信道的零点靠近FFT网格或在FFT网格上时，OFDM面临着严重的符号恢复问题。作为各种错误控制编码技术的替代方案，我们在多路复用之前对符号进行线性预编码(LP)。我们确定了iid或相关瑞利衰落信道的最大可实现分集顺序，并提供了使用LP-OFDM实现最大分集增益的设计规则。在HiperLan2实验中，LP-OFDM与现有的块和卷积编码OFDM替代方案的模拟性能比较倾向于LP-OFDM。

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Linearly precoded or coded OFDM against wireless channel fades?

Orthogonal frequency division multiplexing (OFDM) converts a dispersive channel into parallel subchannels and thus facilitates equalization. But when the channel has nulls close to or on the FFT grid, OFDM faces serious symbol recovery problems. As an alternative to various error-control coding techniques that have been proposed to ameliorate the problem, we linearly precode (LP) symbols before they are multiplexed. We identify the maximum achievable diversity order for iid or correlated Rayleigh fading channels and also provide design rules for achieving maximum diversity gains with LP-OFDM. Simulated performance comparisons of LP-OFDM with existing block and convolutionally coded OFDM alternatives favor LP-OFDM in a HiperLan2 experiment.

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2001 IEEE Third Workshop on Signal Processing Advances in Wireless Communications (SPAWC'01). Workshop Proceedings (Cat. No.01EX471)

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