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Performance analysis of hybrid PAPR reduction technique for LTE uplink communications

机译：LTE上行通信中混合PAPR降低技术的性能分析

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摘要

Long Term Evolution standard implemented Single Carrier Frequency Division Multiple Access (SC-FDMA) in the uplink communications due to its low peak to average power ratio (PAPR). But for higher order modulations, there is a need for further reduction of PAPR in SC-FDMA systems. There are numerous techniques to decrease PAPR, but clipping and companding techniques are very simple to implement without any side information.μlaw companding provides good PAPR reduction but increases the average power of companded signal. In this paper, the distribution of SC-FDMA signal is approximated, and a companding technique is proposed to transform the approximated distribution into a uniform distribution, which reduces PAPR without increasing average power of the signal. For further improvement in PAPR, a hybrid technique is also proposed where the companded signal is clipped to a specific threshold value. Simulation results show that PAPR reduction achieved by the proposed companding technique is better than that ofμlaw companding with a slight degradation in bit error rate (BER) performance. The proposed companding technique with no decompanding operation has better BER performance when compared to that with approximated decompanding operation. The hybrid technique further reduces PAPR with similar BER performance as that of proposed companding technique by carefully choosing the clipping ratio.
机译：长期演进标准由于其峰均功率比（PAPR）低，因此在上行链路通信中实现了单载波频分多址（SC-FDMA）。但是对于更高阶的调制，需要进一步降低SC-FDMA系统中的PAPR。有许多降低PAPR的技术，但是削波和压扩技术很容易实现，没有任何附带信息。μlaw压扩可以很好地降低PAPR，但会增加压扩信号的平均功率。本文对SC-FDMA信号的分布进行了近似，并提出了压扩技术，将近似分布转换为均匀分布，从而在不增加信号平均功率的情况下降低了PAPR。为了进一步改善PAPR，还提出了一种混合技术，其中将压缩后的信号限幅到特定阈值。仿真结果表明，所提出的压扩技术所实现的PAPR降低效果优于μlaw压扩技术，并且误码率（BER）性能略有下降。与采用近似解压缩操作相比，所提出的没有解压缩操作的压缩技术具有更好的BER性能。通过仔细选择削波比，混合技术进一步降低了具有与建议压扩技术相似的BER性能的PAPR。

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