Efficient PAPR Reduction in OFDM Systems Based on a Companding Technique With Trapezium Distribution
Efficient PAPR Reduction in OFDM Systems Based on a Companding Technique With Trapezium Distribution
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DOI：
10.1109/tbc.2011.2112237
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发表时间：
2011-02
影响因子：
4.5
通讯作者：
S. Jeng;Jia-Ming Chen
中科院分区：
文献类型：
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作者：
S. Jeng;Jia-Ming Chen
正交频分复用（OFDM）已成为无线通信系统中应用最广泛的技术。OFDM主要受其高峰均功率比（PAPR）的限制。一种均匀分布的非线性压扩方案能以低误比特率（BER）有效地降低PAPR。然而，均匀分布的压扩方案无法灵活变化以满足系统的不同性能要求。因此，本研究提出一种将OFDM信号转换为梯形分布的新方案。均匀分布的压扩方案是所提方案的一种特殊情况。推导了所提方案的通用公式，并通过设置一个参数的值来实现PAPR降低和BER性能之间的权衡。然后，仿真结果显示了在加性高斯白噪声（AWGN）信道和多径信道上的PAPR降低情况以及BER，表明所提方案在PAPR降低和BER之间提供了一种良好的权衡。
Orthogonal Frequency Division Multiplexing (OFDM) has become the most widely adopted technology in wireless communication systems. OFDM is limited mainly by its high Peak-to-Average Power Ratio (PAPR). A uniformly distributed nonlinear companding scheme efficiently reduces PAPR with a low Bit Error Rate (BER). However, the uniformly distributed companding scheme cannot perform variably to satisfy the different performance requirements for the systems. Therefore, this work proposes a novel scheme that transforms the OFDM signals into a trapezium distribution. The uniformly distributed companding scheme is a special case of the proposed scheme. The general formulas of the proposed scheme are derived and the trade-off between PAPR reduction and BER performance is achieved by setting the value of a parameter. Then, the simulation results show the PAPR reduction and the BER over the AWGN and multipath channels, indicating that the proposed scheme provides a favorable trade-off between the PAPR reduction and the BER.