FEC coding with a rate adaptive spread spectrum OFDM system

Zhong Ye, G. Saulnier, D. Lee, M. Medley
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引用次数: 3

Abstract

This paper investigates the use of a spread spectrum OFDM modulation to provide a variable rate communications link that is tolerant of multipath fading. The system adaptively varies the amount of spreading in response to changing channel conditions in an attempt to optimize throughput while maintaining acceptable error rate performance. System performance results for AWGN and Rayleigh fading channels, both frequency selective and frequency non-selective, show that a desired BER performance can be maintained. A trade-off analysis between forward error correction (FEC) coding and spreading for a fixed bandwidth expansion factor is performed. For convolutional coding the results show that a low-rate code provides better performance while, for a Reed-Solomon code, a coding rate of approximately 1/2 is best.
用速率自适应扩频OFDM系统进行FEC编码
本文研究了使用扩频OFDM调制来提供可容忍多径衰落的可变速率通信链路。系统根据不断变化的信道条件自适应地改变传播量,试图在保持可接受的错误率性能的同时优化吞吐量。对AWGN和瑞利衰落信道(频率选择性和非频率选择性)的系统性能结果表明,该方法可以保持理想的误码率性能。对前向纠错(FEC)编码和固定带宽扩展系数的扩展进行了权衡分析。对于卷积编码,结果表明低速率代码提供更好的性能,而对于Reed-Solomon编码,大约1/2的编码速率是最好的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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