论文部分内容阅读
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。
The OFDM-based on-board switching technology can realize the on-board service exchange through the on-satellite sub-carrier exchange. Taking the downlink of satellite as the research object, a cross-layer design idea is proposed in this paper. A joint optimization method of OFDM subcarrier allocation and peak-to-average ratio suppression is proposed. The method adaptively allocates subcarriers to the downlink transmission services of each satellite according to the downlink channel state of the current spot beam, the destination of each transmission service and the QoS requirements, and in combination with the PAPR suppression of OFDM signals, and does not require Transmit sideband information and extra power. The simulation results show that this method can effectively suppress the peak-to-average ratio of OFDM signals while allocating subcarriers reasonably.