1. RECEIVER SIDE COMPONENTS DESCRIPTION (SAMPLE ASSIGNMENT)
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Generalized OFDM transmission model
This sample assignment shows OFDM transmission system with channel effects
Generalized_OFDM_transmission_model.m
%% The matlab code given below is made by Bhavik Doshi, Email for any queries at
bhavik.d007@gmail.com
%% This just for testing purpose and all rights are reserved.
clc;
close all;
clear all;
fd=10; % maximum Doppler shift considering 5km/hr speed of moment
ts=1e-2; % Input sample period
h=rayleighchan(ts,fd);
sym=1000;
snr=50;
time=2;
col=['r' 'g' 'b'];
M=[16 64 256];
for mm=1:length(M) %% Making Generalise for multi point modulation
msg=randi([1 M(mm)-1],sym,1);
MMMM = comm.RectangularQAMModulator(M(mm));
MMMM.NormalizationMethod = 'Average Power';
MMMM.AveragePower=250;
modData = step(MMMM,msg);
mod=transpose(modData);
msgln=length(mod);
dftpnt=64; %% FFT hardware capacity
ppt=dftpnt-12; %% Removing 12 points as per IEEE 802.11a standards
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2. it=ceil(msgln/ppt); %% Defining itration required to transmit singal
for i=1:it
if(msgln<i*ppt)
add=(i*ppt)-msgln; %% Logic is to make num. of msg signals exactly divisible by 52,
and if not, number of zeros to be padded is calulated
end
end
mod1=[mod zeros(1,add)]; %% Finally adding required dummy 0 symbols to make total
msg sym number divisible by 52.
for i=1:it
block(i,1:ppt)=mod1(((ppt*(i-1))+1):(ppt*i)); %% Dividing Information in blocks of 52
end
for i=1:it
xx=[zeros(1,6) block(i,1:ppt) zeros(1,6)]; %% adding 6 + 52 + 6 = 64 bits ready for idft
operation
tx11((dftpnt*(i-1)+1):(64*i))=ifft(xx,dftpnt); %% Parallel to Serial converter ready to tx
end
%% adding mimo effects
y=h.PathGains*tx11;
%% End of transmitter ......
%% Over the air and part of reciever ....
for tim=1:time
for ss=1:snr
yn=awgn(y,ss);
fin=yn/h.PathGains; %% Assuming channel estimations are known
for i=1:it
rx(i,1:dftpnt)=fin((dftpnt*(i-1)+1):dftpnt*i); %% Serial Received data converted into block.
Each block contains 64 parallel data.
rec=fft(rx(i,1:dftpnt),dftpnt); %% Each block is computed fft, block is made up of 64
Parallel data only, not more or less.
rec11(i,1:ppt)=rec(7:58); %%Band pass Filter which removes information 0 to 6 and 59 to
64 (reason for sending info only on 52 points)
end
[d1 d2]=size(rec11); %% d1 is calculated because it might be possible that receiver might
not have info of total tx bits.
for i=1:d1
rx111(ppt*(i-1)+1:ppt*i)=rec11(i,1:ppt); %% Coverting parallel data from all 52 symbol
blocks to serial
end
l2=length(rx111);
rx11122=rx111(1:(l2-add));
%% Removing dummy symbols added, this info rx should know from tx
mrec=comm.RectangularQAMDemodulator(M(mm));
mrec.NormalizationMethod = 'Average Power';

3. mrec.AveragePower=250;
mrec1 = step(mrec,transpose(rx11122));
%% Demodulating to make equivalant original transmitted Symbols
[n1(ss+1) r1(ss+1)]=biterr(msg,mrec1);
end
nfin(tim,1:snr+1)=r1;
end
ffin=sum(nfin)/time;
semilogy(0:snr,ffin,col(mm));
grid on
hold on
end
legend('16-QAM','64-QAM','256-QAM');
xlabel('SNR in dB');
ylabel('BER');
title('OFDM Transmission System');
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