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Amplitude and Sign Adjustment for Peak-to-Average-Power Reduction

机译:幅度和符号调整,可降低峰均功率

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摘要

In this letter, we propose a method to reduce the peak-to-mean-envelope-power ratio (PMEPR) of multicarrier signals by modifying the constellation. For$M$-ary phase-shift keying constellations, we minimize the maximum of the multicarrier signal over the sign and amplitude of each subcarrier. In order to find an efficient solution to the aforementioned nonconvex optimization problem, we present a suboptimal solution by first optimizing over the signs, and then optimizing over the amplitudes given the signs. We prove that the minimization of the maximum of a continuous multicarrier signal over the amplitude of each subcarrier can be written as a convex optimization problem with linear matrix inequality constraints. We also generalize the idea to other constellations such as 16-quadrature amplitude modulation. Simulation results show that by an average power increase of 0.21 dB, and not sending information over the sign of each subcarrier, PMEPR can be decreased by 5.1 dB for a system with 128 subcarriers.
机译:在这封信中,我们提出了一种通过修改星座图来降低多载波信号的峰均值信封功率比(PMEPR)的方法。对于$ M $ ary相移键控星座,我们将每个子载波的符号和幅度上的多载波信号的最大值最小化。为了找到上述非凸优化问题的有效解决方案,我们提出了一个次优解决方案,方法是先对符号进行优化,然后对给定的幅度进行优化。我们证明了在每个子载波的幅度上连续多载波信号的最大值的最小化可以写为具有线性矩阵不等式约束的凸优化问题。我们还将这个想法推广到其他星座,例如16正交幅度调制。仿真结果表明,通过平均功率增加0.21 dB,并且不通过每个子载波的符号发送信息,对于具有128个子载波的系统,PMEPR可以降低5.1 dB。

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