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On the achievable information rate with peak-power-limited orthogonal frequency-division multiplexing

机译：峰值功率限制正交频分复用实现的信息速率

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摘要

This paper addresses the problem of determining the statistical distribution of the peak-to-average power ratio (PAR) of orthogonal frequency-division multiplexing (OFDM) transmit signals. In practice, transmission systems are amplitude-limited, thus the large peak values of OFDM signals are clipped and nonlinear distortion follows. In order to avoid the resulting degradations, i.e., spectral widening and increased bit-error rate, a systematic construction of OFDM signals without large peaks is desired. The paper provides new results on the PAR distribution and hence on the achievable information rate with OFDM signals that are peak-limited. In particular, it is shown that in the case of phase-shift-keying (PSK) subcarrier modulation, the frequently applied model of Gaussian data coefficients is not appropriate. By solving an integral equation, new analytic expressions for the PAR and the achievable information rate are derived. Comparison with simulation results confirms that the new model is accurate for all ranges of practical interest.
机译：本文解决了确定正交频分复用（OFDM）发送信号的峰均功率比（PAR）的统计分布的问题。实际上，传输系统受幅度限制，因此OFDM信号的大峰值被削波，随后出现非线性失真。为了避免导致的劣化，即频谱加宽和增加的误码率，需要没有大峰值的OFDM信号的系统构造。本文提供了有关PAR分布的新结果，从而提供了峰值受限OFDM信号可获得的信息速率方面的新结果。特别地，示出了在相移键控（PSK）子载波调制的情况下，频繁应用的高斯数据系数模型是不合适的。通过求解积分方程，可以得出有关PAR和可达到的信息率的新解析表达式。与仿真结果的比较证实，新模型对于实际应用的所有范围都是准确的。

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