基于MCPC/FDMA卫星通信网络的功率控制优化算法

Power Control Optimization Algorithm based on MCPC/FDMA Satellite Communication Network

卫星通信网包含多种尺寸且功放类型各异的地球站,在MCPC/FDMA模式下,中央站可同时对多个业务站传输信息。单载波功率调节方法在多载波场景中存在一定的功率浪费,造成地球站的业务承载能力降低。针对上述问题,按照业务信号的传输流程,分析信号的电平变化,采用最优功率算法和增益自适应(MA)算法,对功放增益和调制解调器输出功率电平进行调节控制,优化业务初始发送电平,最后比较优化前后地球站传送业务的总功率。仿真结果表明,优化方法能够有效降低低速率业务的发射功率,提高地球站的业务承载能力。

Satellite communication network involves multi-size earth stations and different power amplifiers. In MCPC/FDMA mode, the central station can simultaneously transmit information to multiple service stations. The single carrier power adjustment method has certain waste of power in the multi-carrier scene, and this would reduce the service-carrying capability of the earth station. Aiming at above problems and in accordance with the transmission process of traffic signal, transmission process,the level change of the signal is analyzed, adopts the optimal power algorithm and MA algorithm are adopted to adjust and control the gain of amplifier and the output power level of the modem, and optimize the initial traffic level. Finally, the total powers of earth-station transmission service before and after optimization are compared. Simulation results indicate that the optimized method can effectively reduce transmitting power of low-rate service and improve the service-carrying capability of earth station.