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信道估计对于VRVP-MQAM系统的整体性能至关重要,论述了VRVP-MQAM方法在实际应用中遇到的问题,针对假定CSI已知的传统研究方法,该文通过采用MMSE算法进行信道估计,研究了MMSE估计误差对VRVP-MQAM方法的ASE性能影响,并在Rayleigh衰落信道下进行了仿真,仿真结果表明:与信道状态已知(ρ=1)相比,MMSE估计误差(ρ=0.9时)会产生1~3 d B左右的ASE性能差距;当平均SNR为20 d B时,MMSE算法下信道状态的平均频谱效率为0.3 bps/Hz,比理想信道状态的平均频谱效率低。因此,VRVP-MQAM方法的应用将会越来越广泛。
Channel estimation is very important for the overall performance of VRVP-MQAM system. The problems encountered in the practical application of VRVP-MQAM method are discussed. For the traditional research method of assuming CSI is known, this paper uses the MMSE algorithm to estimate the channel, The influence of MMSE estimation error on the ASE performance of the VRVP-MQAM method is simulated and simulated under the Rayleigh fading channel. The simulation results show that when the MMSE estimation error (ρ = 0.9) is smaller than that of the channel state (ρ = 1) The average spectral efficiency of the channel state under the MMSE algorithm is 0.3 bps / Hz, which is lower than the average spectral efficiency of the ideal channel state when the average SNR is 20 dB. Therefore, the application of VRVP-MQAM method will be more and more widely.