57 lines
1.8 KiB
Matlab
57 lines
1.8 KiB
Matlab
function rmsEVM = hePlotEVMPerSymbol(eqDataSym,cfgRx,evmSymPlot,varargin)
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% hePlotEVMPerSymbol Plots EVM per symbols for all spatial streams
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%
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% RMSEVM = hePlotEVMPerSymbol(EQDATASYM,CFGRX,EVMSYMPLOT) plots EVM per
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% symbol averaged over subcarriers for all spatial streams.
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%
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% RMSEVM is the EVM of EQDATASYM in decibels.
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%
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% EQDATASYM are the demodulated HE-Data field OFDM symbols for a user,
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% specified as a Nsd-by-Nsym-by-Nss matrix of real or complex values,
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% where Nsd is the number of data subcarriers in the HE-Data field and
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% Nsym is the number of OFDM symbols, and Nss is the number of spatial
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% streams.
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%
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% CFGRX is the format configuration object of type <a href="matlab:help('wlanHERecoveryConfig')">wlanHERecoveryConfig</a>.
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%
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% EVMSYMPLOT is a system object of type <a href="matlab:help('dsp.ArrayPlot')">dsp.ArrayPlot</a>.
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%
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% RMSEVM = hePlotEVMPerSymbol(...,USERIDX,NUMUSERS) displays user
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% number and number of user information in the figure title.
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% Copyright 2019 The MathWorks, Inc.
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[~,~,Nss] = size(eqDataSym);
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if nargin == 5
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userIdx = varargin{1};
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numUsers = varargin{2};
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elseif nargin == 4
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userIdx = varargin{1};
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numUsers = 1; % Number of users are unKnown, prefix this to 1
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end
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EVM = comm.EVM;
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EVM.ReferenceSignalSource = 'Estimated from reference constellation';
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EVM.ReferenceConstellation = wlanReferenceSymbols(cfgRx);
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rmsEVMPerSym = permute(EVM(eqDataSym),[2 3 1]);
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str = cell(Nss,1);
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for iss=1:Nss
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str{iss} = sprintf('Spatial stream %d',iss);
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end
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evmSymPlot.ChannelNames = str;
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if nargin>3
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evmSymPlot.Name = sprintf('EVM per symbol, user#%d/%d',userIdx,numUsers);
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else
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evmSymPlot.Name = sprintf('EVM per symbol');
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end
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rmsEVM = 20*log10(rmsEVMPerSym/100);
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evmSymPlot(rmsEVM);
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evmSymPlot.show
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release(evmSymPlot);
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end |