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针对比例选择映射法的峰均功率比(peak-to-average power ratio,PAPR)高于传统选择映射方法的缺点,提出了一种改进方法。这种方法通过规定新的判决准则,将部分输入信号进行缩小运算,从而达到了进一步降低电力线通信正交频分复用(orthogonal frequency division multiplexing,OFDM)系统PAPR的目的。分析及仿真结果表明,在保证系统的误比特率(bit error rate,BER)性能的前提下,与原比例选择映射法相比,改进后的方法能够进一步降低系统的PAPR,它具有算法简单、发送效率高且易于与其他电力线通信信道降低PAPR的技术结合使用等特点,在电力线信道中具有较好的实用价值。
Aiming at the shortcoming of peak-to-average power ratio (PAPR) of the ratio selection mapping method over the traditional selection mapping method, an improved method is proposed. This method achieves the goal of further reducing PAPR of power line communication orthogonal frequency division multiplexing (OFDM) by defining new decision criteria and reducing the input signals. The analysis and simulation results show that, compared with the original proportional selection mapping method, the improved method can further reduce the PAPR of the system under the premise of ensuring the bit error rate (BER) performance of the system. The proposed method has the advantages of simple algorithm, Efficient and easy to use with other powerline communication channels to reduce PAPR technology combined with the characteristics of the power line channel has good practical value.