CAJ | 학술논문

该文基于一种全新的基于OFDM的星载交换方案,给出了此星载交换方案的星地下行链路跨层设计工作流程和相关实现方法,此方法根据星地下行链路信号发射功率上限、关于每个地面设备的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、业务类型、业务传输速率要求等参数,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并自适应配置每个子载波的调制制式,生成每个传输业务与子载波的对应关系,充分利用链路资源并满足传输业务的QoS要求.
해문기우일충전신적기우OFDM적성재교환방안,급출료차성재교환방안적성지하행련로과층설계공작류정화상관실현방법,차방법근거성지하행련로신호발사공솔상한、관우매개지면설비적당전점파속성지하행련로신도상태、매개성지하행련로전수업무목적지、업무류형、업무전수속솔요구등삼수,실현재속우불동지면설비적각개성지하행련로전수업무지간자괄응분배자재파병자괄응배치매개자재파적조제제식,생성매개전수업무여자재파적대응관계,충분이용련로자원병만족전수업무적QoS요구.
This paper proposes an downlink cross-layer design procedure and algorithm for On-board switch scheme based on OFDM. The ultimate objective is to maximize the system downlink throughput subject to spot beam downlink transmit power constraint, downlink channel state information about each user, bit error ratio requirement of subcarrier after signal detection by users, and destination user and QoS of each service. The algorithm can adaptively allocate subcarriers and chose modulation scheme for every subcarrier among different users and services. Simulation results show that the proposed algorithm is able to guarantee consistent degree of QoS for the same service.