mapultx.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!

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%  Property of Freescale
%  Freescale Confidential Proprietary
%  Freescale Copyright (C) 2005 All rights reserved
%  ----------------------------------------------------------------------------
%  $RCSfile: MapULTx.m.rca $
%  $Revision: 1.4 $
%  $Date: Tue Oct 31 11:25:31 2006 $
%  Target: Matlab
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%***************************************************************************
%  802.16-2004 OFDMA PHY - MapULTx Uplink Tx
%
%    Description: Maps Rx data from physical carrier positions to logical
%                 positions
%
%    Input:
%           Nused: number of used subchannels
%           Nsubcarriers: number of subcarriers in one slot (normally 48)
%           dataOVec: matrix of data carrier locations in the middle symbol
%                     of every slot (one row for each subchannel)
%           dataPVec: matrix of data carrier locations in the first and
%                     third symbol of every slot (one row for each
%                     subchannel)
%           rotationOffVec: rotation offset at which data carriers are
%                           mapped
%           k: slot vector number (to rotate subchannel numbers every slot
%              vector)
%           d_v_freq_inp: vector of UP freq. domain symbols, each row
%                         represents a single slot, all subchannels concatenated.
%
%    Output:
%           d_m_map:    Matrix of UP freq. domain samples
%                       mapped to the physical subcarriers, for all
%                       subchannels. Pilots values are interleaved
%                       Each row is an OFDMA symbol
%
%    Functions:
%                N/A
%
%    Data Files:
%                N/A
%
%***************************************************************************

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

function d_m_map = MapULTx(Nused, Nsubcarriers, Nfft, pilotLocVec, dataOVec, dataPVec, rotationOffVec, k, d_v_freq_slot, pilot_vector);

d_m_map = zeros(3,408);
%**************************************************************************
% Insert Pilots
%**************************************************************************
% initialize mapping of logical subchannels to physical subchannels
scAccess = 1:Nused;

if k > 1
    % Calculate subchannel offset based on slot vector number
    SCoffset = mod(13*(k-1),Nused)+1;
    % Rotate subchannels numbers vector from 2nd slot on
    scAccess = [scAccess(SCoffset:end),scAccess(1:SCoffset-1)];
end

%**************************************************************************
% Insert Data and Pilots
%**************************************************************************

for sIndex = 1:Nused

    realSC = scAccess(sIndex);    % subchannel number are read in a different order
    % due to subchannel rotation

    % retrieve subchannel specific information, according to
    % subchannel rotation
    dataO = dataOVec(realSC,:);
    dataP = dataPVec(realSC,:);
    pilot = pilotLocVec(realSC,:);
    rotationOffset = rotationOffVec(realSC);
    % Insert Data and Pilot values
    newWord = d_v_freq_slot(1+Nsubcarriers*(sIndex-1):Nsubcarriers*sIndex); % select the subch.
    pilot_value = pilot_vector(sIndex);
    d_m_map(1,pilot) =  pilot_value;
    d_m_map(3,pilot) =  pilot_value;
    d_m_map(1,dataP) =  newWord(1:12);
    d_m_map(2,dataO) =  newWord(13:36);
    d_m_map(3,dataP) =  newWord(37:48);

    % Extract Data locations
    if (rotationOffset>0)
        offCorr = Nsubcarriers - rotationOffset + 2;
        % roll-back the rotation of the data carriers as they are
        % read from the tiles
        newWord = [newWord(offCorr:end),newWord(1:offCorr-1)];
        DataLoc = [DataLoc(offCorr:end),DataLoc(1:offCorr-1)];
    end

end