关键词: 通信质量, 吞吐量, 误比特率, 调制方式, 码元传输速率

Abstract: In order to improve the communication quality effectively, an approach of changing information transmission rate named VCTRM was proposed. The approach changed the modulation type and the chip transmission rate adaptively according to the current channel status when satellite communicated with ground station. The approach not only overcomes the defect that variable modulation type cannot meet the requirement of Bit Error Rate (BER) in system, but also solves the problem that the variable chip transmission rate can not improve the throughput in bad channel status. Simulation was given on three kinds of information transmission methods with Matlab: variable modulation method, variable chip transmission method and VCTRM method. The simulation results indicate that the proposed approach can not only meet the requirement of the system BER at any time but also get larger throughput than other approaches apparently.

Key words: communication quality, throughput, Bit Error Rate (BER), modulation type, chip transmission rate