Using Dynamic Rate Control Simulation with DMG instead of VHT

Hi there, I am doing some research with 802.11ad, and I stumbled upon "802.11 Dynamic Rate Control Simulation" in the MATLAB documentation. The example is geared towards 802.11ac

I set it up on my MATLAB installation, and it worked perfectly. The only thing is that when I try to replace all instanced of VHT (802.11ac) with DMG (802.11ac) I get this error:

Unrecognized property 'ChannelBandwidth' for class 'wlanDMGConfig'.

Error in dynamicRateControlSim (line 18)
cfgDMG.ChannelBandwidth = 'CBW40'; % 40 MHz channel bandwidth

I would appreciate any help, thank you,

Here is the code that I am using:

%%802.11 Dynamic Rate Control Simulation
% This example shows dynamic rate control by varying the
% Modulation and Coding scheme (MCS) of successive packets transmitted 
% over a frequency selective multipath fading channel.
% https://www.mathworks.com/help/wlan/examples/802-11-dynamic-rate-control-simulation.html

clear all;
tic;

% #ok<UNRCH supresses warnings about unreachable code
% Do not remove

%%Waveform Configuration

cfgVHT = wlanVHTConfig;
cfgVHT.ChannelBandwidth = 'CBW160'; % 40 MHz channel bandwidth
cfg.MCS = 1; % QPSK rate-1/2
cfgVHT.APEPLength = 4096; % APEP length in bytes

% Set random stream for repeatability of results
s = rng(21);

%%Channel Configuration

tgacChannel = wlanTGacChannel;
tgacChannel.DelayProfile = 'Model-D';
tgacChannel.ChannelBandwidth = cfgVHT.ChannelBandwidth;
tgacChannel.NumTransmitAntennas = 1;
tgacChannel.NumReceiveAntennas = 1;
tgacChannel.TransmitReceiveDistance = 20; % Distance in meters for NLOS
tgacChannel.RandomStream = 'mt19937ar with seed';
tgacChannel.Seed = 10;

% Set the sampling rate for the channel
sr = wlanSampleRate(cfgVHT);
tgacChannel.SampleRate = sr;

%%Rate Control Algorithm Parameters

rcaAttack = 1;  % Control the sensitivity when MCS is increasing
rcaRelease = 0; % Control the sensitivity when MCS is decreasing
threshold = [11 14 19 20 25 28 30 31 35];
snrUp = [threshold inf] + rcaAttack;
snrDown = [-inf threshold] - rcaRelease;
snrInd = cfgVHT.MCS; % Store the start MCS value

%%Simulation Parameters

numPackets = 100; % Number of packets transmitted during the simulation
walkSNR = true;

% Select SNR for the simulation
if walkSNR
    meanSNR = 22;   % Mean SNR
    amplitude = 14; % Variation in SNR around the average mean SNR value
    % Generate varying SNR values for each transmitted packet
    baseSNR = sin(linspace(1,10,numPackets)) * amplitude + meanSNR;
    snrWalk = baseSNR(1); % Set the initial SNR value
    % The maxJump controls the maximum SNR difference between one
    % packet and the next
    maxJump = 0.5;
else
    % Fixed mean SNR value for each transmitted packet. All the variability
    % in SNR comes from a time varying radio channel
    snrWalk = 22; %#ok<UNRCH>
end

% To plot the equalized constellation for each spatial stream set
% displayConstellation to true
displayConstellation = false;
if displayConstellation
    ConstellationDiagram = comm.ConstellationDiagram; %#ok<UNRCH>
    ConstellationDiagram.ShowGrid = true;
    ConstellationDiagram.Name = 'Equalized data symbols';
end

% Define simulation variables
snrMeasured = zeros(1,numPackets);
MCS = zeros(1,numPackets);
ber = zeros(1,numPackets);
packetLength = zeros(1,numPackets);

%%Processing Chain

for numPkt = 1:numPackets
    if walkSNR
        % Generate SNR value per packet using random walk algorithm biased
        % towards the mean SNR
        snrWalk = 0.9 * snrWalk + 0.1 * baseSNR(numPkt) + rand(1) * maxJump * 2 - maxJump;
    end

      % Generate a single packet waveform
      txPSDU = randi([0,1],8 * cfgVHT.PSDULength,1,'int8');
      txWave = wlanWaveformGenerator(txPSDU,cfgVHT,'IdleTime',5e-4);

      % Receive processing, including SNR estimation
      y = processPacket(txWave,snrWalk,tgacChannel,cfgVHT);

      % Plot equalized symbols of data carrying subcarriers
      if displayConstellation && ~isempty(y.EstimatedSNR)
          release(ConstellationDiagram);
          ConstellationDiagram.ReferenceConstellation = helperReferenceSymbols(cfgVHT);
          ConstellationDiagram.Title = ['Packet ' int2str(numPkt)];
          ConstellationDiagram(y.EqDataSym(:));
          drawnow
      end

      % Store estimated SNR value for each packet
      if isempty(y.EstimatedSNR)
          snrMeasured(1,numPkt) = NaN;
      else
          snrMeasured(1,numPkt) = y.EstimatedSNR;
      end

      % Determine the length of the packet in seconds including idle time
      packetLength(numPkt) = y.RxWaveformLength/sr;

      % Calculate packet error rate (PER)
      if isempty(y.RxPSDU)
          % Set the PER of an undetected packet to NaN
          ber(numPkt) = NaN;
      else
          [~,ber(numPkt)] = biterr(y.RxPSDU,txPSDU);
      end

      % Compare the estimated SNR to the threshold, and adjust the MCS value
      % used for the next packet
      MCS(numPkt) = cfgVHT.MCS; % Store current MCS value
      increaseMCS = (mean(y.EstimatedSNR) > snrUp((snrInd==0)+snrInd));
      decreaseMCS = (mean(y.EstimatedSNR) <= snrDown((snrInd==0)+snrInd));
      snrInd = snrInd+increaseMCS-decreaseMCS;
      cfgVHT.MCS = snrInd-1;
  end

%%Display and Plot Simulation Results

disp(['Overall data rate: ' num2str(8*cfgVHT.APEPLength*(numPackets-numel(find(ber)))/sum(packetLength)/1e6) ' Mbps']);
disp(['Overall packet error rate: ' num2str(numel(find(ber))/numPackets)]);

plotResults(ber,packetLength,snrMeasured,MCS,cfgVHT);

% Restore default stream
rng(s);

toc;

[Jan]

According to the documentation (link) and the error message, a wlanDMGConfig object does not have a ChannelBandwidth property. So please post the code, which shows, what you are exactly doing.

[Caetano Melone]

Posted