基于OFDM星载交换的星地下行链路子载波分配与峰均比抑制联合优化方法

提出了一种基于OFDM的全新星载交换方案,此星载交换方案可通过星上子载波交 换实现业务交换。以点波束星地下行链路为研究对象，结合跨层设计思想，提出了一种 适用于点波束星地下行链路的子载波分配和峰均比抑制方法。此方法可根据点波束星地下行 链路信号发射功率上限、当前点波束星地下行链路信道状态、每个星地下行链路传输业务目 的地和QoS要求，并结合抑制点波束星地下行链路OFDM信号的峰均比，实现在属于不同地面 设备的各个星地下行链路传输业务之间自适应分配子载波，实现充分利用点波束星地下行链 路资源、满足传输业务的QoS要求，同时抑制星地下行链路OFDM信号的峰均比，而且不会因 抑制星地下行链路OFDM信号的峰均比而增加额外的边带信息和传输功率。

Joint Optimization of Downlink Subcarrier Allocation and PAPR Reduction for OFDM Based on-board Switching Scheme

A novel OFDM based on-board switching scheme has been proposed, which can achieve service switching by on-board sub-carrier switching. This paper focuses on the satellite spot beam downlinks, and proposes a joint optimization method of downlink sub-carrier allocation and PAPR reduction. In this method, sub-carriers can be allocated adaptively to the services of different user terminals according to the current downlink channel state information, transmit power limit, service destinations, QoS requirements, and PAPR of the downlink OFDM signal. Simulation results show that the proposed method can satisfy the QoS requirements and reduce the PAPR to the utmost without extra side information and transmit power.