32 lines
1.3 KiB
Mathematica
32 lines
1.3 KiB
Mathematica
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function rx = heCPECorrection(rx,sigbPilots,chanEst,chanBW)
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%heCPECorrection Estimate and correct common phase error
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%
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% RX = heCPECorrection(RX,SIGBPILOTS,CHANEST,CHANBW) returns the phase
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% corrected OFDM symbols of HE-SIG-B field using the input, RX, HE-SIG-B
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% pilot symbols, SIGBPILOTS, channel estimates, CHANEST, and channel
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% bandwidth CHANBW.
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%
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% RX is a complex Nst-by-Nsym-by-Nr array containing the received OFDM
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% symbols. Nst is the number of subcarriers and Nr is the number of
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% receive antennas.
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%
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% SIGBPILOTS are the pilots symbols in the demodulated HE-SIG-B field.
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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, where Nst is the number of
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% occupied subcarriers and Nr is the number of receive antennas.
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%
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% CHANBW is a character vector or string. The allowed channel bandwidth
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% are 'CBW20', 'CBW40', 'CBW80' and 'CBW160'.
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% Copyright 2018 The MathWorks, Inc.
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numSubchannels = wlan.internal.cbwStr2Num(chanBW)/20;
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numBits = size(sigbPilots,2);
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z = 4;
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refPilots = repmat(wlan.internal.nonHTPilots(numBits, z),numSubchannels,1,1);
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cpe = wlan.internal.commonPhaseErrorEstimate(sigbPilots,chanEst,refPilots);
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rx = wlan.internal.commonPhaseErrorCorrect(rx,cpe);
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end
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