1. TRANSMITTER SUBSYSTEM (SAMPLE ASSIGNMENT)
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MB OFDM Transmission
This sample assignment shows a Matlab code which implements MB-OFDM transmission
block as per ECMA 368 standard.
main.m
% MB-OFDM System simulation
clear all
close all
clc
% Configurable parameters
% Source length represents the number bits in input binary sequence
% it should be a multiple of 'BITS_PER_SYMBOL' otherwise zeros should be
% padded to the source.
SOURCE_LENGTH = 1200;
BINARY_ALPHABETS = [0,1];
% Create random binary source
randomData = randsrc(1,SOURCE_LENGTH,BINARY_ALPHABETS);
% Scramble the source using the ECMA-368 recommended scrambler
scrambledData = scramble(randomData,1);
% Do Convolutional encoding and puncturing to obtain encoded bits
encodedData = convEncode(scrambledData);
% Do Interleaving of the encoded data to circumvent burst errors
% Parameters for interleaving obtained from ECMA-368 standard for MB-OFDM
BITS_PER_SYMBOL = 100; % Number of bits per OFDM symbol
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2. TDS_FACTOR = 2;
BLOCK_SIZE = 10;
CYCLIC_SHIFT = 33;
% Symbol interleaving
sIntrlvData = symbolIntrlv(encodedData,TDS_FACTOR,BITS_PER_SYMBOL);
% Tone interleaving
tIntrlvData = toneIntrlv(sIntrlvData,BLOCK_SIZE,BITS_PER_SYMBOL);
% Cyclic interleaving
cIntrlvData = cyclicIntrlv(tIntrlvData,CYCLIC_SHIFT,BITS_PER_SYMBOL);
% Modulate interleaved data using QPSK modulation
modData = modulateQPSK(cIntrlvData);
% Add guard and pilot sub carriers
mappedData = mapCarriers(modData);
% Take 128-point IDFT using IFFT algorithm
transmitSignal = ifft(reshape(mappedData,[],128),128,2);
% Reshape the matrix into a vector
txSignal = reshape(transmitSignal,1,[]);
% Plot the baseband tx signal
figure('Name','Transmitted Signal');
plot(abs(txSignal));
xlabel('Time');
ylabel('Amplitude');
title('MB-OFDM tx baseband signal');
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