PAPR analysis of coded-OFDM system and mitigating its effect with clipping, SLM and PTS

ICIMU 2011 : Proceedings of the 5th international Conference on Information Technology & Multimedia Pub Date : 2011-11-01 DOI:10.1109/ICIMU.2011.6122749

A. Joshi, D. Saini

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引用次数: 8

Abstract

In wireless communication, parallel transmission of symbols using multi carriers is applied to achieve high efficiency in terms of throughput and better transmission quality. Orthogonal Frequency Division Multiplexing (OFDM) is one of the techniques for parallel transmission. In multipath environment the performance of orthogonal frequency division multiplexing (OFDM) is improved by introducing some kind of channel coding. Coded OFDM (COFDM) is the new candidate for application such as DAB and DVB-T due to its better performance in fading environment. However high peak to average power ratio (PAPR) is a major demerit of OFDM system, it leads to increased complexity of circuit and reduced efficiency of RF amplifier. In this paper our aim is to evaluate the PAPR of COFDM system and reducing its effect by clipping, Selected Mapping (SLM) and Partial Transmit Sequence (PTS) techniques. COFDM system used here comply with IEEE 802.11a specifications and Reed Solomon (RS) codes along with convolution codes are used for channel coding purpose. Channel used for consideration is AWGN. The performance is evaluated in terms of PAPR value and BER.

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编码ofdm系统的PAPR分析及用裁剪、SLM和PTS减轻其影响

在无线通信中，为了提高传输效率和传输质量，采用多载波并行传输符号。正交频分复用(OFDM)是并行传输的一种技术。在多径环境下，通过引入信道编码来提高正交频分复用(OFDM)的性能。编码OFDM (COFDM)因其在衰落环境下的良好性能而成为DAB和DVB-T等应用的新候选技术。然而，高峰值平均功率比(PAPR)是OFDM系统的一个主要缺点，它增加了电路的复杂性，降低了射频放大器的效率。本文的目的是评估COFDM系统的PAPR，并通过裁剪、选择映射(SLM)和部分传输序列(PTS)技术降低其影响。这里使用的COFDM系统符合IEEE 802.11a规范，使用RS码和卷积码进行信道编码。用于考虑的频道是AWGN。性能评估的PAPR值和误码率。

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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ICIMU 2011 : Proceedings of the 5th international Conference on Information Technology & Multimedia

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