论文部分内容阅读
在正交频分复用技术(OFDM)系统接收到的信号较弱的情况下,为了获得较好的系统误码率,OFDM系统峰均功率比的设定值应较小。此时,采用选择性映射和部分传输序列法虽然能够有效地降低OFDM系统的峰均功率比,但是,其效果并不理想,且算法较复杂。为此,提出了软限幅法来降低OFDM系统的峰均功率比。理论分析和仿真结果表明,在峰均功率比取值较小的情况下,采用软限幅法的OFDM系统具有较好地误码率性能,且易于实现。
When the signal received by OFDM system is weak, the PAPR of OFDM system should be set lower in order to get a better system BER. In this case, although selective mapping and partial transmission sequence method can effectively reduce the PAPR of OFDM system, the effect is not satisfactory and the algorithm is complicated. To this end, proposed soft clipping method to reduce the OFDM system peak-to-average power ratio. The theoretical analysis and simulation results show that the OFDM system with soft-limit method has better BER performance and is easy to implement when the PAPR is smaller.