Sign in Subscribe

matlab code for wireless communication system

Last updated on 

Designing a wireless communication system involves several key components, such as modulation, channel coding, interleaving, modulation, and decoding. Below is a simplified example of a basic wireless communication system using MATLAB. .

matlabCopy code% Wireless Communication System in MATLAB

% Parameters
SNR_dB = 10; % Signal-to-Noise Ratio in dB
messageLength = 1000; % Length of the message
modulationOrder = 16; % Modulation order (e.g., QAM)
codingRate = 1/2; % Channel coding rate

% Generate random message bits
messageBits = randi([0 1], 1, messageLength);

% Modulation
modulatedSymbols = qammod(messageBits, modulationOrder);

% Channel Encoding
encodedBits = encode(messageBits, codingRate);

% Channel Interleaving
interleavedBits = matintrlv(encodedBits, modulationOrder);

% Add noise to the signal
SNR = 10^(SNR_dB/10);
receivedSymbols = awgn(modulatedSymbols, SNR);

% Channel Deinterleaving
deinterleavedBits = matdeintrlv(interleavedBits, modulationOrder);

% Channel Decoding
decodedBits = decode(deinterleavedBits, codingRate);

% Demodulation
demodulatedSymbols = qamdemod(receivedSymbols, modulationOrder);

% Calculate Bit Error Rate (BER)
BER = biterr(messageBits, decodedBits) / messageLength;

% Display results
disp(['Bit Error Rate (BER): ' num2str(BER)]);

% Plot the constellation diagram
scatterplot(receivedSymbols);
title('Received Constellation Diagram');

In this example:

  1. modulatedSymbols: The message bits are modulated using quadrature amplitude modulation (QAM).
  2. encodedBits: Channel coding is applied to the message bits for error correction.
  3. interleavedBits: The encoded bits are interleaved to spread errors.
  4. Noise is added to the modulated symbols to simulate the channel.
  5. deinterleavedBits: The interleaved bits are deinterleaved.
  6. decodedBits: Channel decoding is applied to correct errors.
  7. demodulatedSymbols: The received symbols are demodulated.

The Bit Error Rate (BER) is then calculated to evaluate the performance of the system. The constellation diagram is also plotted to visualize the received symbols in the complex plane.