Nonlinear behavior and power efficiency of the Power Amplifier (PA) contradictorily depend on the input signal amplitude distribution. The transmitted signal in multi-carrier modulation exhibits high Peak-to-Average Power Ratio (PAPR) and large bandwidths, leading to the degradation of the radio link and additional generation out-of-band interferences, which degrade the quality of the transmission. Practical solutions exist, like a power back-off, but with unacceptable efficiency performances of the transmitter. This paper deals with efficiency and linearity improvement using a new PAPR reduction method based on the combination of Discrete Cosine Transform and shaping technique. The main principle is to determine an optimal coding scheme according to a trade-off between coding complexity and performance benefits in the presence of PA nonlinearities. Simulation and experimental results in the context of OFDM signal and using a 20 W–3.7 GHz Radio-Frequency Power Amplifier show an improvement on PAPR reduction of about 3.25 dB. Also, the communication criteria like Bit Error Rate and Error Vector Magnitude are improved by about one decade and a half and \(8\%\), respectively.

功率放大器（PA）的非线性行为和功率效率矛盾地取决于输入信号的幅度分布。多载波调制中的发射信号表现出较高的峰均功率比（PAPR）和大带宽，从而导致无线电链路的性能下降以及其他产生的带外干扰，从而降低了传输质量。存在一些实用的解决方案，例如功率补偿，但发射器的效率性能令人无法接受。本文结合离散余弦变换和整形技术，使用一种新的PAPR降低方法来处理效率和线性度改进问题。主要原理是在存在PA非线性的情况下，根据编码复杂度和性能优势之间的权衡确定最佳编码方案。在OFDM信号范围内并使用20 W–3.7 GHz射频功率放大器的仿真和实验结果表明，PAPR降低了约3.25 dB。此外，像位错误率和错误矢量幅度这样的通信标准也提高了大约十五年半，\（8 \％\）。