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Модуляция символов в 4G (lteSymbolModulate)

Доброго времени суток, возникла проблема в том, что бы переделать верхний код под модуляцию символов для 4G, используя toolbox lte. То бишь нужно вместо nrSymbolModulate/Demodulate использовать lteSymbolModulate/Demodulate, но графики почему то не получаются (Нижний код). Очень нужна помощь, буду благодарен.

clear all;
clc;
 
N = 24e5;
 
%========================================================================
%%%%%%%%%%%%%%%%%%%%%%%%% BPSK MODULATION %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
%%%%%%%%%%%%%%%%%%%% 1. BER OF AWGN %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
% Step 1: Generating random binary data
x = randn(1,N) >= 0;
 
SNR_all = -5:1:10;
BER_all = zeros(1,length(SNR_all));
 
%%%%%%%%%%%%%%%%%%%%%%%% 16-QAM MODULATION %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
x_16QAM = nrSymbolModulate(x','16QAM');
 
BER_all_16QAM = zeros(1,length(SNR_all));
 
j = 1;
for SNR = -5:1:10
 
    % Adding noise to transmitted signal without fading
    sigma = sqrt(1/(2*(10^(SNR/10))));
    noise = sigma*randn(1,length(x_16QAM));
    rec = x_16QAM' + noise;
 
    % Step 4:
    % Setting the threshold and demodulating
    rec_dec = nrSymbolDemodulate(rec','16QAM','DecisionType','Hard');
    BER_count = sum(xor(x,rec_dec'));
    BER_all_16QAM(j) = BER_count/length(x);
    j = j + 1;
end
 
figure(2)
subplot(2,2,1)
semilogy(SNR_all,BER_all_16QAM,'lineWidth',1.5);
xlabel('SNR per bit (E_b/N_o) dB');
ylabel('Bit Error Rate(BER) in dB');
title(' BER vs (E_b/N_o) for 16QAM in AWGN channel')
grid on;
clear all;
clc;
 
% Date 2/19/2021
% Yashwanth
% Requires 5G ToolBOX
% Params 
% Input bits
N = 24e3;
 
%========================================================================
%%%%%%%%%%%%%%%%%%%%%%%%% BPSK MODULATION %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
%%%%%%%%%%%%%%%%%%%% 1. BER OF AWGN %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
% Step 1: Generating random binary data
x = randn(1,N) >= 0;
 
SNR_all = 0:1:30;
BER_all = zeros(1,length(SNR_all));
 
%%%%%%%%%%%%%%%%%%%%%%%% 16-QAM MODULATION %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
x_16QAM = lteSymbolModulate(x,'16QAM');
 
BER_all_16QAM = zeros(1,length(SNR_all));
 
j = 1;
for SNR = 0:1:30
 
    % Adding noise to transmitted signal without fading
    sigma = sqrt(1/(2*(10^(SNR/10))));
    noise = sigma*randn(1,length(x_16QAM));
    rec = x_16QAM' + noise;
 
    % Step 4:
    % Setting the threshold and demodulating
    rec_dec = lteSymbolDemodulate(rec,'16QAM');
    BER_count = sum(xor(x,rec_dec'));
    BER_all_16QAM(j) = BER_count/length(x);
    j = j + 1;
end
 
figure(2)
subplot(2,2,1)
semilogy(SNR_all,BER_all_16QAM,'lineWidth',1.5);
xlabel('SNR per bit (E_b/N_o) dB');
ylabel('Bit Error Rate(BER) in dB');
title(' BER vs (E_b/N_o) for 16QAM in AWGN channel')
grid on;

Теги

    29.05.2022

    Ответы

    • alextip
      alextip+44.13
      6.11.2022 15:47

      Поставье в свойствах lteSymbolDemodulate жесткую демодуляцию, либо нужно дополнительное устройство, для принятия решения по мягкому порогу.

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