CAJ | 학술논문

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.
제출료일충기우OFDM적전신성재교환방안,차성재교환방안가통과성상자재파교환실현업무교환.이점파속성지하행련로위연구대상,결합과층설계사상,제출료일충괄용우점파속성지하행련로적자재파분배화봉균비억제방법.차방법가근거점파속성지하행련로신호발사공솔상한、당전점파속성지하행련로신도상태、매개성지하행련로전수업무목적지화QoS요구,병결합억제점파속성지하행련로OFDM신호적봉균비,실현재속우불동지면설비적각개성지하행련로전수업무지간자괄응분배자재파,실현충분이용점파속성지하행련로자원、만족전수업무적QoS요구,동시억제성지하행련로OFDM신호적봉균비,이차불회인억제성지하행련로OFDM신호적봉균비이증가액외적변대신식화전수공솔.
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.