OFDM子载波分配与峰均比抑制联合优化

Joint optimization of downlink OFDM subcarrier allocation and PAPR reduction

基于OFDM的星载交换技术能够通过星上子载波交换实现星载业务交换。该文以星地下行链路为研究对象,采用跨层设计思想,提出了一种星地下行链路OFDM子载波分配和峰均比抑制联合优化方法。该方法根据当前点波束星地下行链路信道状态、各传输业务目的地和QoS要求,并结合OFDM信号峰均比抑制,为各星地下行链路传输业务自适应分配子载波,且不需要传输边带信息和额外功率。仿真结果表明该方法在合理分配子载波的同时能够有效抑制OFDM信号峰均比。

An orthogonal frequency division multiplexing（OFDM） based on-board switching scheme was developed to achieve service switching by on-board subcarrier switching.This paper focuses on the satellite spot beam downlinks,and proposes a joint optimization method for downlink subcarrier allocation and peak-to-average power ratio（PAPR） reduction based on cross-layer design.Subcarriers can be allocated adaptively without extra side information and transmit power according to the current downlink channel state information,service destinations,QoS requirements,and PAPR of the downlink OFDM signal.Simulation results show that the method can simultaneously allocate subcarriers reasonably and reduce the PAPR effectively.