文章基本信息

标题：REDUCING PAPR OF OFDM BASED WIRELESS SYSTEMS USING COMPANDING WITH CONVOLUTIONAL CODES
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作者：Pawan Sharma ; Seema Verma
期刊名称：International Journal of Distributed and Parallel Systems
印刷版ISSN：2229-3957
电子版ISSN：0976-9757
出版年度：2011
卷号：2
期号：6
DOI：10.5121/ijdps.2011.2609
出版社：Academy & Industry Research Collaboration Center (AIRCC)
摘要：OFDM is a promising broadband technique. However, the implementation disadvantage of OFDM is Peak-to-Average Power Ratio (PAPR) which outweighs all the potential benefits of OFDM. In this paper, a new scheme will be introduced, that combines selective mapping and companding technique to reduce PAPR. However, companding technique is a distortion technique but by using convolutional codes with companding also improves BER performance of the OFDM system. It also removes the disadvantage of SLM technique of extra side information i.e. this technique does not require any side information unlike in conventional SLM. By considering the example of OFDM with BPSK modulation, it is shown in simulation results that the proposed scheme performs well in both reducing PAPR and improving BER performance without the need of any side information. It has been calculated that PAPR of OFDM signal can be reduced by 5dB over the original system with the proposed scheme
关键词：Orthogonal Frequency Division Multiplexing (OFDM); Peak-To-Average Power Ratio (PAPR); Selective;Mapping (SLM); Bit Error Rate (BER); Complementary Cummulative Distribution Function (CCDF)