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针对现代卫星通信对带宽和性能需求,设计了一种高性能、高频谱利用率的基于群集频分复用技术的高速卫星数传系统。分析了系统在高动态、大多普勒频移信道下的技术难点,采用了群集传输模式,大幅增加系统带宽降低发射峰均比,提出一种大范围的载波捕获方法,设计了收发射系统的技术方案和发射功放预失真校正方案。对系统性能进行了仿真验证,结果表明在900KHz多普勒频移下可稳定跟踪并解调,在动态情况下系统性能与理想QPSK只存在1dB的损失。
Aiming at the demand of bandwidth and performance of modern satellite communication, a high-speed satellite data transmission system based on cluster frequency division multiplexing is designed with high performance and high spectrum efficiency. The technical difficulties of the system under high dynamic and large Doppler frequency shift channels are analyzed. The cluster transmission mode is adopted to greatly increase the system bandwidth and reduce the transmission peak-to-average ratio. A large-scale carrier acquisition method is proposed, and the receiving and transmitting system Technical solutions and transmit amplifier pre-distortion correction program. The system performance is verified by simulation. The results show that the tracking and demodulation can be stably tracked at 900KHz Doppler shift, and the system performance is only 1dB loss from the ideal QPSK under dynamic conditions.