LTE-接收端信号处理

1）SNR estimation：

if LTE_params.SNR_estimation 
        [S_plus_noise_power N_power] = LTE_SNR_estimator(LTE_params,y_rx_unsync);
        Noise_power = sum(mean(N_power,1));
        Signal_power = sum(S_plus_noise_power) - Noise_power;
        
        SNR = 10*log10(Signal_power/Noise_power);
        sigma_n2 = 10^(-SNR/10);
        y_rx_unsync(1:LTE_params.number_of_zeros_for_SNR_estimation,:) = [];
        %y_rx_unsync(end-LTE_params.number_of_zeros_for_SNR_estimation+1:end,:) = [];
        y_rx_unsync = y_rx_unsync(1:LTE_params.Fs*LTE_params.Tsubframe,:);
        
        UE_output(uu).Signal_plus_noise_power = S_plus_noise_power;
        UE_output(uu).Noise_power = N_power;
    else
        UE_output(uu).Signal_plus_noise_power = 1;
        UE_output(uu).Noise_power = sigma_n2;
    end

2）Carrier frequency offset compensation

3）Remove CP，FFT and remove zeros

4）Disassemble reference symbols

5）Channel and noise estimation

6）Disassemble symbols

7）Perform detection

8）SINR Calculation

9）Undo layer mapping

10）Decoding