mderep.m

OFDMA 物理层开发的matlab 源码.飞思卡尔提供.对物理层开发的工程师有帮助!

function [Out,BlkSize] = mDerep(In,BlkSize,R,ModMode)
% Uplink Rx derepetition for OFDMA of IEEE 802.16 (WiMAX)
%
%     [Out,BlkSize] = mDerep(In,BlkSize,R,ModMode)
%
% This module combines the repeated slots into one single slot.
% Note that repetition is only applied for QPSK.
%
% In      : soft-decisions values (bytes, values -128 to 127)
%           one column per code block
% BlkSize : row vector, length = number of code blocks
%           number of data elements in each code block (or column)
% R       : repetition factor (1,2,4 or 6)
% ModMode : Modulation Mode (2, 4 or 6)
%
% Matlab 7 Release 14 SP2

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%  Property of Freescale
%  Freescale Confidential Proprietary
%  Freescale Copyright (C) 2005 All rights reserved
%  ----------------------------------------------------------------------------
%  $RCSfile: mDerep.m.rca $
%  $Revision: 1.3 $
%  $Date: Thu Oct 19 17:52:15 2006 $
%  Target: Matlab
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

[m,n]=size(In);

if (ModMode~=2) & (R>1)
    error('Error: Repetition is only allowed for QPSK.');
end

SlotSize=48*ModMode;

%check dimensions
[x,y]=size(BlkSize);
if ((x~=1)|(y~=n))
    error('Error: BlkSize must be row vector with the same number of columns as In.');
end
if any(BlkSize>m)
    error('Error: BlkSize can not be larger than number of rows.');
end
if any(mod(BlkSize,SlotSize*R))
    error('Error: The block size does not match burst parameters.');
end

%repetition only required if repetition factor is greater than 1
if R==1
    Out=In; %do nothing
else
    temp=double(reshape(In,SlotSize,m/SlotSize,n));
    Slots=temp(:,1:R:m/SlotSize,:);
    for k=2:R,
        Slots = Slots + temp(:,k:R:m/SlotSize,:);
    end
    Out = int8(reshape(Slots/R,m/R,n));
    BlkSize=BlkSize/R;
end