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(orthogo...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。展开更多
A new approach for peak-to-average power ratio (PAPR) reduction in orthogonal frequency division multiplexing (OFDM) systems was proposed.This approach is based on assigning powers to the different subcarriers of OFDM...A new approach for peak-to-average power ratio (PAPR) reduction in orthogonal frequency division multiplexing (OFDM) systems was proposed.This approach is based on assigning powers to the different subcarriers of OFDM using an unequal power distribution strategy.In addition,a reduced complexity selective mapping (RC-SLM) scheme was proposed.The proposed scheme is based on partitioning the frequency domain symbol sequence into several sub-blocks,and then each sub-block is multiplied by different phase sequences whose length is shorter than that used in the conventional SLM scheme.Then,a kind of low complexity conversions is used to replace the IFFT blocks.The performance of the proposed RC-SLM scheme along with the new approach was studied with computer simulation.The obtained results show that the proposed RC-SLM scheme is able to achieve the lowest computational complexity when compared with other low complexity schemes proposed in the literature while at the same time improves the PAPR reduction performance by about 0.3 dB.展开更多
文摘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。
文摘A new approach for peak-to-average power ratio (PAPR) reduction in orthogonal frequency division multiplexing (OFDM) systems was proposed.This approach is based on assigning powers to the different subcarriers of OFDM using an unequal power distribution strategy.In addition,a reduced complexity selective mapping (RC-SLM) scheme was proposed.The proposed scheme is based on partitioning the frequency domain symbol sequence into several sub-blocks,and then each sub-block is multiplied by different phase sequences whose length is shorter than that used in the conventional SLM scheme.Then,a kind of low complexity conversions is used to replace the IFFT blocks.The performance of the proposed RC-SLM scheme along with the new approach was studied with computer simulation.The obtained results show that the proposed RC-SLM scheme is able to achieve the lowest computational complexity when compared with other low complexity schemes proposed in the literature while at the same time improves the PAPR reduction performance by about 0.3 dB.
