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correct for these codes and help me to get running codes

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PROSPER
PROSPER 2024-7-12，9:50
回答： sai charan sampara 2024-7-16，7:56
Ran in:
% System parameters
M = 50; % Number of antennas
K = 3; % Number of terminals
SNR_dB = 20; % SNR in dB
numSymbols = 1e4; % Number of symbols for simulation
L_prime = 5; % L' = 5
% QPSK Modulator and Demodulator
qpskMod = comm.QPSKModulator('BitInput', false);
qpskDemod = comm.QPSKDemodulator('BitOutput', false);
% Generate random data symbols
dataSymbols = randi([0 3], K, numSymbols);
% Generate transmitted symbols (QPSK)
txSymbols = step(qpskMod, dataSymbols(:)); % Corrected input format
txSymbols = reshape(txSymbols, [], K);
% Channel matrix
H = (randn(M, K) + 1i*randn(M, K))/sqrt(2);
% Received signal with AWGN
rxSignal = awgn(H .* txSymbols, SNR_dB, 'measured'); % Transpose to match dimensions
Arrays have incompatible sizes for this operation.
% MRC Combining
combiner_MRC = conj(H);
rxCombined_MRC = combiner_MRC * rxSignal;
% ZF Combining
combiner_ZF = pinv(H);
rxCombined_ZF = combiner_ZF * rxSignal;
% Demodulate received symbols
rxDataSymbols_MRC = step(qpskDemod, rxCombined_MRC(:));
rxDataSymbols_ZF = step(qpskDemod, rxCombined_ZF(:));
% Decision threshold (for QPSK, it's zero)
detected_MRC = rxDataSymbols_MRC > 0;
detected_ZF = rxDataSymbols_ZF > 0;
% Reshape for plotting
rxCombined_MRC = reshape(rxCombined_MRC, [], 1);
rxCombined_ZF = reshape(rxCombined_ZF, [], 1);
% Plotting
figure;
subplot(1, 2, 1);
scatterplot(rxCombined_MRC);
title('MRC Receiver');
xlabel('In-Phase');
ylabel('Quadrature');
axis equal; % Equal scaling on both axes
grid on;
subplot(1, 2, 2);
scatterplot(rxCombined_ZF);
title('ZF Receiver');
xlabel('In-Phase');
ylabel('Quadrature');
axis equal; % Equal scaling on both axes
grid on;
sgtitle('Constellation of Estimated Symbols for K=3, M=50, L''=5, and \rho=20 dB');
  2 个评论
Steven Lord
Steven Lord 2024-7-12，10:47
What makes you think this code is incorrect?
  • Do you receive warning and/or error messages? If so the full and exact text of those messages (all the text displayed in orange and/or red in the Command Window) may be useful in determining what's going on and how to avoid the warning and/or error.
  • Does it do something different than what you expected? If so, what did it do and what did you expect it to do?
  • Did MATLAB crash? If so please send the crash log file (with a description of what you were running or doing in MATLAB when the crash occured) to Technical Support so we can investigate.
Sam Chak
Sam Chak 2024-7-12，10:57
Ran in:
@PROSPER, You can check the size of the arrays.
% Generate transmitted symbols (QPSK)
txSymbols = step(qpskMod, dataSymbols(:)); % Corrected input format
txSymbols = reshape(txSymbols, [], K);
size(txSymbols)
ans = 1x2
10000 3
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% Channel matrix
H = (randn(M, K) + 1i*randn(M, K))/sqrt(2);
size(H)
ans = 1x2
50 3
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% Received signal with AWGN
rxSignal = awgn(H .* txSymbols, SNR_dB, 'measured'); % Transpose to match dimensions
Arrays have incompatible sizes for this operation.

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回答（1 个）

sai charan sampara
sai charan sampara 2024-7-16，7:56
Ran in:
Hello,
I made the following changes to the code to make the array sizes compatible.
rxSignal = awgn(H * txSymbols', SNR_dB, 'measured'); % Transpose to match dimensions
% MRC Combining
combiner_MRC = conj(H)';
The following code post changes might help you:
M = 50; % Number of antennas
K = 3; % Number of terminals
SNR_dB = 20; % SNR in dB
numSymbols = 1e4; % Number of symbols for simulation
L_prime = 5; % L' = 5
% QPSK Modulator and Demodulator
qpskMod = comm.QPSKModulator('BitInput', false);
qpskDemod = comm.QPSKDemodulator('BitOutput', false);
% Generate random data symbols
dataSymbols = randi([0 3], K, numSymbols);
% Generate transmitted symbols (QPSK)
txSymbols = step(qpskMod, dataSymbols(:)); % Corrected input format
txSymbols = reshape(txSymbols, [], K);
% Channel matrix
H = (randn(M, K) + 1i*randn(M, K))/sqrt(2);
% Received signal with AWGN
rxSignal = awgn(H * txSymbols', SNR_dB, 'measured'); % Transpose to match dimensions
% MRC Combining
combiner_MRC = conj(H)';
rxCombined_MRC = combiner_MRC * rxSignal;
% ZF Combining
combiner_ZF = pinv(H);
rxCombined_ZF = combiner_ZF * rxSignal;
% Demodulate received symbols
rxDataSymbols_MRC = step(qpskDemod, rxCombined_MRC(:));
rxDataSymbols_ZF = step(qpskDemod, rxCombined_ZF(:));
% Decision threshold (for QPSK, it's zero)
detected_MRC = rxDataSymbols_MRC > 0;
detected_ZF = rxDataSymbols_ZF > 0;
% Reshape for plotting
rxCombined_MRC = reshape(rxCombined_MRC, [], 1);
rxCombined_ZF = reshape(rxCombined_ZF, [], 1);
% Plotting
scatterplot(rxCombined_MRC);
title('MRC Receiver');
xlabel('In-Phase');
ylabel('Quadrature');
axis equal; % Equal scaling on both axes
grid on;
scatterplot(rxCombined_ZF);
title('ZF Receiver');
xlabel('In-Phase');
ylabel('Quadrature');
axis equal; % Equal scaling on both axes
grid on;
sgtitle('Constellation of Estimated Symbols for K=3, M=50, L''=5, and \rho=20 dB');

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