16QAM-TCM Technology Research Applied in Relay Satellite Communication System
Trellis coding modulation technology can improve the signal-to-noise ratio,reduce the transmission power,and low-er the bit error rate without changing the bandwidth of the information transmission spectrum.The realization method is to divide the constellation map to form a subset and gradually increase the minimum Euclidean distance between the signal points in the constella-tion map.In this paper,the demodulation performance of 8PSK and 16QAM-TCM modulation techniques is simulated on the simu-lation platform of a relay satellite communication system developed by the project team.The simulation curve shows the relationship between the required bit error rate and signal-to-noise ratio.The simulation results demonstrate:① under the channel conditions of an ideal channel,I/Q amplitude and phase imbalance,amplitude and frequency characteristics,group delay,phase noise,power am-plifier saturation,if the required BER is 1E-7,compared to 8PSK modulation technology,the signal-to-noise ratio of 16QAM-TCM technology saves 8.85 dB,9.04 dB,8.45 dB,10.2 dB,8.5 dB,and 14.6 dB,respectively;② under the channel conditions of non-linear,correspondingly along with increasing of the signal-to-noise ratio,the BER of 8PSK modulation technology fluctuates around the order of 1E-3;③ if the required BER is 1E-7,compared with the ideal channel SNR simulation result,the non-linear channel SNR simulation result of 16QAM-TCM technology loses 4.8 dB.
Trellis-coded modulationRelay satellite communication system simulation16QAM-TCM8PSKNon-linear channel
万方数据
维普
