mdatademodulation.m

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%  Property of Freescale
%  Freescale Confidential Proprietary
%  Freescale Copyright (C) 2005 All rights reserved
%  ----------------------------------------------------------------------------
%  $RCSfile: mDataDemodulation.m.rca $
%  $Revision: 1.4 $
%  $Date: Mon Oct 30 18:36:27 2006 $
%  Target: Matlab
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%
%***************************************************************************
%  802.16-2004 OFDMA PHY - mDataDemodulation
%
%    Description: % This function receives two OFDMA symbols
%                   with data, pilot and DC values organized in 2
%                   vectors of Nused carriers. The recived
%                   data is demodulated using PRBS sequence which is
%                   generated by the mGenPRBS function.
%                   In the demodulation the OFDMA symbol index is taken
%                   into account. The DC carrier is removed at the end.
%    Input:
%           SymbolIndex: The index of the first (out of 2 input) OFDMA
%                       symbols within the frame. This index is usefull to
%                       decide on even or odd cluster structure to start
%                       with.
%
%           OutTPRx:    Two OFDMA symbols with data, pilot and DC carriers
%                       located at the physical carriers (one OFDM symbol
%                       per column)
%
%           wk:         PRBS sequence ( +/- 1 )
%
%     Output:
%           out:        Demodulated data and pilot subcarriers (DC removed)
%
%    Functions:
%                N/A
%
%    Data Files:
%                N/A
%
%***************************************************************************

%-- Matlab files used by this file
%-- End of list

function out = mDataDemodulation(OutTPRx , wk, SymbolIndex);

[m,n] = size(OutTPRx);
if mod(m,2)
    error('Error: Input vector length should be even.');
end

%add DC carrier
OutTPRx = [OutTPRx(1:m/2,:); zeros(1,n); OutTPRx(m/2+1:m,:)];
[m,n] = size(OutTPRx);

%demodulation per OFDM symbol
for s=1:n,
    offset = mod(s-1+SymbolIndex,32);
    temp(:,s) = wk(offset+(1:m)).*double(OutTPRx(:,s));
end

%output class is equal to input class
out = zeros(m-1,n,class(OutTPRx));

%remove DC
out(:,:) = [temp(1:floor(m/2),:);temp(floor(m/2)+2:m,:)];