33 lines
1.3 KiB
Mathematica
33 lines
1.3 KiB
Mathematica
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function est = preHEChannelEstimate(rxSym,chanEst,numSubchannels)
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%preHEChannelEstimate Estimate channel on extra four subcarriers per
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%subchannel and create full channel estimates
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%
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% EST = preHEChannelEstimate(RXSYM,CHANEST,NUMSUBCHANNELS) estimate the
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% channel on extra four subcarrier in L-SIG field and create a full
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% channel estimates.
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%
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% EST is a complex Nst-by-1-by-Nr array containing the estimated channel
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% at data and pilot subcarriers, where Nst is the number of occupied
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% subcarriers and Nr is the number of receive antennas. The Nst includes
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% the channel estimates for the extra four subcarriers present in L-SIG
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% field.
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%
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% RXSYM are the demodulated L-SIG field symbols of size Nst-by-1-by-Nr.
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%
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% CHANEST is a complex Nst-by-1-by-Nr array containing the estimated
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% channel at data and pilot subcarriers using L-LTF field.
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%
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% NUMSUBCHANNELS is a scalar representing the number of 20MHz subchannels
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% in the bandwidth of interest.
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% Copyright 2018-2019 The MathWorks, Inc.
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%#codegen
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est = coder.nullcopy(complex(zeros(size(rxSym,1),size(chanEst,2),size(chanEst,3))));
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for i = 1:numSubchannels
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chanEstExtra = bsxfun(@times,mean(rxSym([1; 2; 55; 56]+56*(i-1),:,:),2),[-1; -1; -1; 1]);
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est((1:56)+(i-1)*56,:,:) = [chanEstExtra([1 2],:,:); chanEst((1:52)+(i-1)*52,:,:); chanEstExtra([3 4],:,:)];
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end
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end
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