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PAPR optimization in MIMO-OFDM system for WiMAX

机译:用于WiMAX的MIMO-OFDM系统中的PAPR优化

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摘要

Future wireless communication is aiming at providing higher data rate services to meet the growing needs. The MIMO-OFDM technology aims at providing bandwidth efficient, higher capacity and higher data rate services to the customers. But, the major hindrance for OFDM is its high Peak to Average Power Ratio (PAPR). PAPR is the ratio of the high peak power to the average power of OFDM symbols. Various techniques have been deployed to reduce the PAPR such as Toning, Selective Level Mapping (SLM), Partial Transmit Sequence (PTS), Clipping and Filtering and Windowing. In this paper we present our optimized precoding and companding technique to optimize the PAPR and Bit Error Rate (BER) for WiMAX system. From the result, it is shown that the combination of precoding and Mu-law companding with QAM mapping technique provides better PAPR reduction. Simulations are carried out in MATLAB tool for different systems. From the results, it is observed that our proposed algorithm gives PAPR value of 1.7 dB which is 0.6 dB lesser than 2.3 dB.
机译:未来的无线通信旨在提供更高的数据速率服务以满足不断增长的需求。 MIMO-OFDM技术旨在为客户提供带宽高效,更高容量和更高数据速率的服务。但是,OFDM的主要障碍是其较高的峰均功率比(PAPR)。 PAPR是高峰值功率与OFDM符号平均功率之比。已经采用了各种技术来降低PAPR,例如色调,选择性电平映射(SLM),部分传输序列(PTS),限幅和过滤以及加窗。在本文中,我们介绍了优化的预编码和压扩技术,以优化WiMAX系统的PAPR和误码率(BER)。从结果可以看出,预编码和Mu-law压扩与QAM映射技术的结合可以更好地降低PAPR。在MATLAB工具中针对不同系统进行了仿真。从结果可以看出,我们提出的算法给出的PAPR值为1.7 dB,比2.3 dB小0.6 dB。

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