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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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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