一种基于载波选择的单射频链路SM-OFDM系统

摘要

传统SM-OFDM系统利用多载波技术可以克服频率选择性衰落,但系统所需射频链路的个数等于发射天线数,系统的能量效率较低.为了提高SM-OFDM 系统的能量效率,提出了一种基于载波选择的单射频链路SM-OFDM系统,并采用载波分组和预编码技术降低系统的复杂度.通过仿真实验可知,基于载波选择的单射频链路SM-OFDM系统在提高系统能量效率的同时还可以提高系统的误码率性能,采用载波分组和预编码技术后系统复杂度明显降低.%Traditional SM-OFDM systems can overcome the frequency selective fading using multicarrier technology,but the number of RF links required by the system is equal to the number of transmit antennas and the energy efficiency of the system is low.In order to improve the energy efficiency of SM-OFDM system,a single RF SM-OFDM system based on carrier selection was proposed,which adopted carrier grouping and precoding technology to reduce the system complexity. The simulation results show that the single RF SM-OFDM system based on carrier selection could improve the system energy efficiency and the BER performance of the system.The system complexity is significantly reduced after utilizing carrier grouping and precoding technology.