A Generalized Piecewise Linear Companding Transform for PAPR Reduction in OFDM Systems

A Generalized Piecewise Linear Companding Transform for PAPR Reduction in OFDM Systems
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正交频分复用系统中用于降低 PAPR 的广义分段线性压扩变换

DOI:
10.1109/tbc.2019.2909183
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发表时间:
2020-03
影响因子:
4.5
通讯作者:
张海林
张海林
中科院分区:
计算机科学1区
文献类型:
--
作者:
胡梅霞;王伟;程文驰;张海林

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压扩是用于降低正交频分复用(Ofdm)信号的峰均功率比(PAPR)的众所周知的技术。分段线性压扩(PLC)方案与其他压扩方案相比,能够以更低的复杂度有效地降低PAPR,同时获得更好的误比特率性能。然而,当压扩信号的PAPR目标值相对较小时,例如16-QAM为4分贝或-QAM为5分贝时,对于高阶QAM调制,PLC在高信噪比区域存在明显的误码平台。针对这一问题,我们首先分析了PLC误接地的原因。在此基础上,我们提出了一种通用的电力线载波方案,通过放宽对平均信号功率守恒的约束来减小解压后信号的失真。最后,为了在PAPR约束下在误码率和功率谱密度性能之间寻求更好的折衷,我们对优化问题进行了描述以获得压扩函数的参数。仿真结果表明,所提出的广义PLC在保持与PLC相同的PAPR性能的同时,能显著提高系统的误码率性能。
Companding is a well-known technique for the peak-to-average-power ratio (PAPR) reduction of orthogonal frequency division multiplexing (OFDM) signals. Piecewise linear companding (PLC) scheme, compared with other companding schemes, can effectively reduce PAPR with much lower complexity, while achieving improved bit-error-rate (BER) performance. However, when the PAPR target value for companded signals is relatively small, such as 4 dB for 16-QAM or 5 dB for 64-QAM, there is a clear error floor of PLC in high SNR region for high-order QAM modulation. Focusing on this problem, we first analyze the reason for the error floor of PLC. Based on the analysis, we propose a generalized PLC scheme to reduce the distortion in decompanded signals with the relaxation of the constraint on the conservation of the average signal power. Finally, we formulate the optimization problems to obtain the parameters of the companding function in the pursuit of a preferable tradeoff between the BER and power spectral density performance under the constraint on PAPR. Simulation results verify that the proposed generalized PLC can significantly improve the BER performance while maintaining the same PAPR performance as PLC.
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