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lab5 task1 done, task2 nearly finished

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ti_mo
2026-06-22 22:03:28 +02:00
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lab_5/HelperNRNTNThroughput.m
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lab_5/HelperNTNPositionEstimate.m
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classdef HelperNTNPositionEstimate
%HelperNTNPositionEstimate Class defining the supporting functions used
%in the receiver position estimation in NTN example
%
% Note: This is an undocumented class and its API and/or
% functionality may change in subsequent releases.
% Copyright 2024-2025 The MathWorks, Inc.
methods (Static)
function out = instantposition(s, v, r, rDot)
% OUT = instantposition(S,V,R,RDOT) returns the possible
% position OUT using satellite position S, satellite velocity
% V, range R, and range-rate RDOT. S and V are in Earth
% Centered Earth Fixed (ECEF) coordinate system. R is in m and
% RDOT is in m/s. OUT is a 3-by-2 matrix with each column
% corresponding to a possible position in LLA (Latitude,
% Longitude, Altitude).
tolerance = 1e-4;
max_iter_refine = 1000;
% Earth Parameters
r_E = 6378137; % Equatorial radius (meters)
r_p = 6356752; % Polar radius (meters)
% Initialize two r_c values with random values
r_c_1 = (r_E - r_p) * rand();
r_c_2 = r_c_1; % Starting both from the same value (can be different if needed)
% Refinement loop for two solutions
for iter = 1:max_iter_refine
prev_r_c_1 = r_c_1;
prev_r_c_2 = r_c_2;
% Compute geometric parameters
r_s2 = dot(s,s); % Squared norm of position vector
% Linear system for refinement
A = [s(1) s(2); v(1) v(2)];
b_1 = 0.5*(r_s2 + r_c_1^2 - r^2);
b_2 = 0.5*(r_s2 + r_c_2^2 - r^2);
c = dot(s,v) - r*rDot;
% Solve the parameters for r_c_1 and r_c_2
mat_1 = [b_1, s(3); c, v(3)];
mat_2 = [b_2, s(3); c, v(3)];
params_1 = A \ mat_1;
params_2 = A \ mat_2;
% Extract parameters for the first solution
alpha_1 = params_1(1);
beta_1 = params_1(3);
gamma_1 = params_1(2);
delta_1 = params_1(4);
% Extract parameters for the second solution
alpha_2 = params_2(1);
beta_2 = params_2(3);
gamma_2 = params_2(2);
delta_2 = params_2(4);
% Calculate discriminant for both solutions
numerator_1 = alpha_1 * beta_1 + gamma_1 * delta_1;
discriminant_1 = numerator_1^2 - (1 + delta_1^2 + beta_1^2) * (alpha_1^2 + gamma_1^2 - r_c_1^2);
numerator_2 = alpha_2 * beta_2 + gamma_2 * delta_2;
discriminant_2 = numerator_2^2 - (1 + delta_2^2 + beta_2^2) * (alpha_2^2 + gamma_2^2 - r_c_2^2);
% Handle negative discriminant by regenerating r_c
if discriminant_1 < 0
r_c_1 = r_p + (r_E - r_p) * rand();
continue;
end
if discriminant_2 < 0
r_c_2 = r_p + (r_E - r_p) * rand();
continue;
end
% Compute z-coordinates for both solutions
z_hat_1 = (numerator_1 + sqrt(discriminant_1)) / (1 + delta_1^2 + beta_1^2);
z_hat_2 = (numerator_2 - sqrt(discriminant_2)) / (1 + delta_2^2 + beta_2^2);
% Compute x and y coordinates for both solutions
x_hat_1 = alpha_1 - beta_1 * z_hat_1;
y_hat_1 = gamma_1 - delta_1 * z_hat_1;
x_hat_2 = alpha_2 - beta_2 * z_hat_2;
y_hat_2 = gamma_2 - delta_2 * z_hat_2;
% Convert to LLA
lla_1 = ecef2llaLocal([x_hat_1; y_hat_1; z_hat_1]);
lla_2 = ecef2llaLocal([x_hat_2; y_hat_2; z_hat_2]);
% Recalculate r_c for refined solutions
dr_1 = sind(lla_1(1))^2 + cosd(lla_1(1))^2 * (r_p / r_E)^2;
r_c_1 = sqrt(r_p^2 / dr_1);
dr_2 = sind(lla_2(1))^2 + cosd(lla_2(1))^2 * (r_p / r_E)^2;
r_c_2 = sqrt(r_p^2 / dr_2);
% Check convergence for both solutions
if abs(r_c_1 - prev_r_c_1) < tolerance && abs(r_c_2 - prev_r_c_2) < tolerance
break;
end
end
out = [];
if discriminant_1 > 0
out = lla_1(:);
end
if discriminant_2 > 0
out = [out(:) lla_2(:)];
end
end
function error = positionerror(originalPos,estimatedPos)
% ERR = positionerror(ORIGINALPOS,ESTIMATEDPOS) computes the
% position errors ERR for given original position ORIGINALPOS
% and estimated positions ESTIMATEDPOS. Original position and
% estimated positions are in LLA. ESTIMATEDPOS is 3-by-N matrix
% with N being the number of positions.
% Convert the positions to ECEF
posECEF = lla2ecefLocal([originalPos estimatedPos]);
error = vecnorm(posECEF(:,1)-posECEF(:,2:end));
end
end
end
function lla = ecef2llaLocal(ecef)
% Output Latitude (degrees), Longitude (degrees), and Altitude (meters)
tmp = matlabshared.orbit.internal.Transforms.itrf2geographic(ecef);
% Convert to degrees and get the LLA coordinates
lla = [rad2deg(tmp(1,1:end)); ...
rad2deg(tmp(2,1:end)); ...
tmp(3,1:end)];
end
function ecef = lla2ecefLocal(lla)
% Output ECEF: X (meters), Y (meters), and Z (meters)
% Convert to radians
lla = [deg2rad(lla(1,1:end)); ...
deg2rad(lla(2,1:end)); ...
lla(3,1:end)];
% Get ECEF coordinates
ecef = matlabshared.orbit.internal.Transforms.geographic2itrf(lla);
end
lab_5/create_baseline_configuration.m
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function [cfgEHT, simParameters, channel, chInfo, maxChDelay, satelliteDopplerShift, chanBW] = create_baseline_configuration(profile, ...
bandwidth_mhz, ...
include_free_space_pathloss, ...
delay_model, ...
carrier_frequency, ...
mobile_speed, ...
mobile_altitude, ...
satellite_altitude, ...
random_stream, ...
seed, ...
tx_antenna_count, ...
rx_antenna_count, ...
apep)
switch bandwidth_mhz
case 20
chanBW = 'CBW20';
case 40
chanBW = 'CBW40';
case 80
chanBW = 'CBW80';
case 160
chanBW = 'CBW160';
case 320
chanBW = 'CBW320';
otherwise
error("Not supported bandwidth!");
end
cfgEHT = wlanEHTMUConfig(chanBW);
cfgEHT.User{1}.APEPLength = apep;
cfgEHT.NumTransmitAntennas = tx_antenna_count;
cfgEHT.User{1}.NumSpaceTimeStreams = 1;
cfgEHT.User{1}.MCS = 0; % default to sweep later
fs = wlanSampleRate(chanBW);
simParameters.IncludeFreeSpacePathLoss = include_free_space_pathloss;
simParameters.DelayModel = delay_model;
simParameters.CarrierFrequency = carrier_frequency;
simParameters.ElevationAngle = 0; % default to sweep later
simParameters.MobileSpeed = mobile_speed;
simParameters.MobileAltitude = mobile_altitude;
simParameters.SatelliteAltitude = satellite_altitude;
simParameters.SampleRate = fs;
simParameters.RandomStream = random_stream;
simParameters.Seed = seed;
simParameters.NumTransmitAntennas = tx_antenna_count;
simParameters.NumReceiveAntennas = rx_antenna_count;
simParameters.NTNChannelType = "TDL";
simParameters.DelayProfile = "NTN-TDL-" + profile;
simParameters.DelaySpread = 30e-9;
c = physconst("lightspeed");
satelliteDopplerShift = dopplerShiftCircularOrbit( ...
simParameters.ElevationAngle,simParameters.SatelliteAltitude, ...
simParameters.MobileAltitude,simParameters.CarrierFrequency);
channel = nrTDLChannel;
channel.DelayProfile = simParameters.DelayProfile;
channel.DelaySpread = simParameters.DelaySpread;
channel.SatelliteDopplerShift = satelliteDopplerShift;
channel.MaximumDopplerShift = simParameters.MobileSpeed*simParameters.CarrierFrequency/c;
channel.NumTransmitAntennas = simParameters.NumTransmitAntennas;
channel.NumReceiveAntennas = simParameters.NumReceiveAntennas;
channel.SampleRate = simParameters.SampleRate;
channel.RandomStream = simParameters.RandomStream;
channel.Seed = simParameters.Seed;
chInfo = info(channel);
maxChDelay = ceil(max(chInfo.PathDelays*channel.SampleRate)) + chInfo.ChannelFilterDelay;
end
lab_5/create_satellite_sim.m
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function satSim = create_satellite_sim(satConfig, stationConfig)
satSim.sc = satelliteScenario;
satSim.sc.StartTime = satConfig.startTime;
satSim.sc.StopTime = satConfig.stopTime;
satSim.sc.SampleTime = satConfig.sampleTime;
earthRadius = physconst("EarthRadius");
semiMajorAxis = earthRadius + satConfig.satAltitude;
satSim.sat = satellite(satSim.sc, semiMajorAxis, satConfig.eccentricity, satConfig.inclination, satConfig.raan, satConfig.argOfPeriapsis, satConfig.trueAnomaly, Name=satConfig.name, OrbitPropagator=satConfig.orbitPropagator);
satSim.ue = groundStation(satSim.sc, stationConfig.Lat, stationConfig.Lon, Altitude=stationConfig.Altitude, Name=stationConfig.Name);
end
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After

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lab_5/lab_5.m
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satConfig.startTime = datetime(2026,6,17,08,00,00);
satConfig.stopTime = satConfig.startTime + hours(2);
satConfig.sampleTime = 30;
satConfig.satAltitude = 600e3;
satConfig.eccentricity = 0;
satConfig.inclination = 90;
satConfig.raan = 42;
satConfig.argOfPeriapsis = 32;
satConfig.trueAnomaly = 0;
satConfig.name = "Timos Surveillance LEO Satellite";
satConfig.orbitPropagator = "two-body-keplerian";
groundStation.Lat = 52.515744683039436;
groundStation.Lon = 13.325825073341306;
groundStation.Name = "HFT building at Einsteinufer 25";
% https://www.randymajors.org/elevation-on-google-maps?x=13.3258251&y=52.5157447&cx=13.3258251&cy=52.5157447&zoom=15&labels=show
groundStation.Altitude = 37;
calc_task1 = true;
calc_task2 = true;
if calc_task1
task1;
end
if calc_task2
if ~calc_task1
task1;
end
task2;
end
lab_5/leo_satellite_pass.md
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<h2 style="text-align: center;">
Lab 5 - Wireless Networking Technologies
</h2>
<h4 style="text-align: center; margin-top: -10pt">
Analyzing a LEO Satellite Pass
</h4>
<p style="text-align: center; margin-top: -15pt;">
by Timo Niemann
</p>
### Task1
#### 1.1
See code `lab_5.m` and `create_satellite_sim.m`, where the first file defines all parameters for the simulation and the create_satellite_sim function creates and returns the satellite and ground station.
#### 1.2
To calculate the distance to the satellite, the MATLAB access analysis example was used as a basis and modified. The distance is calculated with the `aer` function, which returns azimuth, elevation, and slant range between the ground station and the satellite. To avoid invalid channel simulations, the signal-based estimation step is skipped when the Doppler shift `fshift` is non-finite.
![Distance over time sweep](distance_over_time.svg)
The first satellite flyby occurs at around 08:05:30. During the pass, the distance first decreases as the satellite approaches the ground station and then increases again after the closest approach. Around 08:53:30 to 08:54:00, the distance reaches a maximum because the satellite is on the far side of its orbit relative to the ground station. The second pass occurs at around 09:42. Its minimum distance is larger than during the first pass because Earth's rotation changes the relative position of the ground station below the satellite orbit.
#### 1.3
![Elevation angle over time sweep](elevation_angle_over_time.svg)
As in the distance plot, the elevation angle reaches its highest value during the first pass. The second pass has a lower maximum elevation because Earth's rotation shifts the ground station relative to the satellite ground track.
lab_5/parfor_waitbar.m
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function parfor_waitbar(f, totalJobs, detail, reset)
persistent done
if reset
done = 0;
if ishandle(f)
if isempty(detail)
waitbar(0, f, "Starting");
else
waitbar(0, f, detail);
end
end
return
end
if isempty(done)
done = 0;
end
done = done + 1;
if ishandle(f)
progressText = sprintf("Done %d/%d", done, totalJobs);
if ~isempty(detail)
progressText = sprintf("%s | %s", progressText, char(detail));
end
waitbar(min(done / totalJobs, 1), f, progressText);
end
end
lab_5/perform_access_analysis.m
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function res = perform_access_analysis(satSim, queryTime)
sat = satSim.sat;
ue = satSim.ue;
ac = access(sat,ue);
[status,timeout] = accessStatus(ac);
statusIdx = find(status,1);
if isempty(statusIdx)
disp("Position estimation cannot be performed " + ...
"as there is no access between satellite and UE.")
return
end
delete(ac)
[~,el,r] = aer(ue,sat,queryTime);
res.distanceToSatellite = r;
res.elevationAngleToSatellite = el;
carrierFrequency = 2e9;
[fshift,~,dopplerInfo] = dopplershift( ...
sat,ue,queryTime,Frequency=carrierFrequency);
res.rangeRate = -1*dopplerInfo.RelativeVelocity;
[satPos,satVel] = states(sat,queryTime,CoordinateFrame="ecef");
res.satPos = satPos;
res.satVel = satVel;
if ~isfinite(fshift)
return;
end
rng(0)
lightspeed = physconst("lightspeed");
frameDurInSeconds = 10e-3;
delayInSeconds = r/lightspeed;
nFrames = ceil(delayInSeconds/frameDurInSeconds) + 1;
carrier = nrCarrierConfig;
pdsch = nrPDSCHConfig;
pdsch.DMRS.DMRSAdditionalPosition = 2;
[txWaveform,waveformInfo] = ...
HelperNRNTNThroughput.generatePDSCHWaveform( ...
carrier,pdsch,struct,eye(pdsch.NumLayers),"double",carrier.SlotsPerFrame*nFrames);
refGridAllSlots = waveformInfo.ResourceGrid;
delayInSamples = delayInSeconds.*waveformInfo.SampleRate;
integDelaySamples = floor(delayInSamples);
fracDelaySamples = (delayInSamples - integDelaySamples);
staticDelay = dsp.Delay(Length=integDelaySamples);
variableFractionalDelay = dsp.VariableFractionalDelay( ...
InterpolationMethod="Farrow", ...
FarrowSmallDelayAction="Use off-centered kernel", ...
MaximumDelay=1);
delayedTx = staticDelay(txWaveform);
delayedTx = variableFractionalDelay(delayedTx,fracDelaySamples);
channel = p681LMSChannel;
channel.SampleRate = waveformInfo.SampleRate;
channel.CarrierFrequency = carrierFrequency;
channel.SatelliteDopplerShift = fshift;
channel.MobileSpeed = 0;
channel.ElevationAngle = el;
channel.RandomStream = "mt19937ar with seed";
rxWaveform = channel(delayedTx);
freqSearch = 0.999*fshift:sign(fshift):1.001*fshift;
[delayEstSamples,fshiftEst] = HelperNRNTNThroughput.jointTimeFreq( ...
carrier,rxWaveform,refGridAllSlots,freqSearch);
res.rangeEst = delayEstSamples*lightspeed/waveformInfo.SampleRate;
res.rangeRateEst = -1*fshiftEst*lightspeed/carrierFrequency;
end
lab_5/receive_power_over_time.svg
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font-family="Helvetica" font-size="20" font-weight="400" font-style="normal"
>
<text fill="#212121" fill-opacity="1" stroke="none" xml:space="preserve" x="0" y="0.390625" font-family="Helvetica" font-size="20" font-weight="400" font-style="normal"
>10:00</text>
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font-family="Helvetica" font-size="22" font-weight="400" font-style="normal"
>
<text fill="#212121" fill-opacity="1" stroke="none" xml:space="preserve" x="0" y="-0.0625" font-family="Helvetica" font-size="22" font-weight="400" font-style="normal"
>Time</text>
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>
<text fill="#212121" fill-opacity="1" stroke="none" xml:space="preserve" x="0" y="0.390625" font-family="Helvetica" font-size="20" font-weight="400" font-style="normal"
>Jun 17, 2026 </text>
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<text fill="#212121" fill-opacity="1" stroke="none" xml:space="preserve" x="0" y="-0.0625" font-family="Helvetica" font-size="22" font-weight="400" font-style="normal"
>Power [dBm]</text>
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<text fill="#212121" fill-opacity="1" stroke="none" xml:space="preserve" x="0" y="0.390625" font-family="Helvetica" font-size="20" font-weight="400" font-style="normal"
>80</text>
</g>
<g fill="#212121" fill-opacity="1" stroke="#212121" stroke-opacity="1" stroke-width="1" stroke-linecap="square" stroke-linejoin="bevel" transform="matrix(0.509109,0,0,0.5118,21.3556,675.583)"
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<text fill="#212121" fill-opacity="1" stroke="none" xml:space="preserve" x="0" y="0.390625" font-family="Helvetica" font-size="20" font-weight="400" font-style="normal"
>85</text>
</g>
<g fill="#212121" fill-opacity="1" stroke="#212121" stroke-opacity="1" stroke-width="1" stroke-linecap="square" stroke-linejoin="bevel" transform="matrix(0.509109,0,0,0.5118,21.3556,543.709)"
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<text fill="#212121" fill-opacity="1" stroke="none" xml:space="preserve" x="0" y="0.390625" font-family="Helvetica" font-size="20" font-weight="400" font-style="normal"
>90</text>
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<g fill="#212121" fill-opacity="1" stroke="#212121" stroke-opacity="1" stroke-width="1" stroke-linecap="square" stroke-linejoin="bevel" transform="matrix(0.509109,0,0,0.5118,21.3556,411.836)"
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<text fill="#212121" fill-opacity="1" stroke="none" xml:space="preserve" x="0" y="0.390625" font-family="Helvetica" font-size="20" font-weight="400" font-style="normal"
>95</text>
</g>
<g fill="#212121" fill-opacity="1" stroke="#212121" stroke-opacity="1" stroke-width="1" stroke-linecap="square" stroke-linejoin="bevel" transform="matrix(0.509109,0,0,0.5118,15.7554,279.962)"
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<text fill="#212121" fill-opacity="1" stroke="none" xml:space="preserve" x="0" y="0.390625" font-family="Helvetica" font-size="20" font-weight="400" font-style="normal"
>100</text>
</g>
<g fill="#212121" fill-opacity="1" stroke="#212121" stroke-opacity="1" stroke-width="1" stroke-linecap="square" stroke-linejoin="bevel" transform="matrix(0.509109,0,0,0.5118,15.7554,148.088)"
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<text fill="#212121" fill-opacity="1" stroke="none" xml:space="preserve" x="0" y="0.390625" font-family="Helvetica" font-size="20" font-weight="400" font-style="normal"
>105</text>
</g>
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<text fill="#212121" fill-opacity="1" stroke="none" xml:space="preserve" x="0" y="0.390625" font-family="Helvetica" font-size="20" font-weight="400" font-style="normal"
>110</text>
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<text fill="#212121" fill-opacity="1" stroke="none" xml:space="preserve" x="0" y="-0.0625" font-family="Helvetica" font-size="22" font-weight="700" font-style="normal"
>Required transmit power for -75 dBm receive power</text>
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lab_5/simulateTransmission.m
+106
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function [numPacketErrors, numPacketsSimulated, cfrMagnitudes, rxPower, pathLoss]= simulateTransmission(accessAnalysisResults, cfgEHT, channel, maxChDelay, snr, maxNumErrors, simParameters)
numPacketErrors = 0;
numPacketsSimulated = 0;
cfrMagnitudes = [];
rxPower = zeros(size(accessAnalysisResults.elevationAngles));
pathLoss = zeros(size(accessAnalysisResults.elevationAngles));
ofdmInfo = wlanEHTOFDMInfo('EHT-Data', cfgEHT);
ind = wlanFieldIndices(cfgEHT);
stream = RandStream('combRecursive', Seed=simParameters.Seed);
stream.Substream = 1;
RandStream.setGlobalStream(stream);
powerOnlySimulation = isempty(snr);
if ~powerOnlySimulation
snrVal = convertSNR(snr, "snrsc", "snr", FFTLength=ofdmInfo.FFTLength, NumActiveSubcarriers=ofdmInfo.NumTones);
end
if isfield(simParameters, 'TransmitPower')
txPower = simParameters.TransmitPower;
else
txPower = 20;
end
lambda = physconst("lightspeed") / simParameters.CarrierFrequency;
includePathLoss = isfield(simParameters, 'IncludeFreeSpacePathLoss') && simParameters.IncludeFreeSpacePathLoss;
while (powerOnlySimulation || numPacketErrors < maxNumErrors) && numPacketsSimulated < numel(accessAnalysisResults.elevationAngles)
numPacketsSimulated = numPacketsSimulated + 1;
if includePathLoss
packetDistance = accessAnalysisResults.distances(numPacketsSimulated);
pathLoss(numPacketsSimulated) = 20 * log10(4 * pi * packetDistance / lambda);
else
pathLoss(numPacketsSimulated) = 0;
end
rxPower(numPacketsSimulated) = txPower - pathLoss(numPacketsSimulated);
txPSDU = randi([0 1], psduLength(cfgEHT) * 8, 1);
tx = wlanWaveformGenerator(txPSDU, cfgEHT);
stf = tx(ind.LSTF(1):ind.LSTF(2), :);
stfPower = mean(abs(stf(:)).^2);
tx = tx * sqrt(10^((txPower - 30) / 10)) / sqrt(stfPower);
txPad = [tx; zeros(maxChDelay, cfgEHT.NumTransmitAntennas)];
if powerOnlySimulation
continue;
end
packetElevationAngle = accessAnalysisResults.elevationAngles(numPacketsSimulated);
channel.SatelliteDopplerShift = dopplerShiftCircularOrbit(packetElevationAngle, simParameters.SatelliteAltitude, simParameters.MobileAltitude, simParameters.CarrierFrequency);
reset(channel);
rx = awgn(channel(txPad) * db2mag(-pathLoss(numPacketsSimulated)), snrVal);
coarsePacketOffset = wlanPacketDetect(rx, cfgEHT.ChannelBandwidth);
if isempty(coarsePacketOffset)
numPacketErrors = numPacketErrors + 1;
continue;
end
lstf = rx(coarsePacketOffset + (ind.LSTF(1) : ind.LSTF(2)), :);
coarseFrequencyOffset = wlanCoarseCFOEstimate(lstf, cfgEHT.ChannelBandwidth);
rx = frequencyOffset(rx, simParameters.SampleRate, -coarseFrequencyOffset);
nonhtfields = rx(coarsePacketOffset + (ind.LSTF(1) : ind.LSIG(2)), :);
finePacketOffset = wlanSymbolTimingEstimate(nonhtfields, cfgEHT.ChannelBandwidth);
packetOffset = coarsePacketOffset + finePacketOffset;
if packetOffset > maxChDelay
numPacketErrors = numPacketErrors + 1;
continue;
end
rxLLTF = rx(packetOffset + (ind.LLTF(1) : ind.LLTF(2)), :);
fineFrequencyOffset = wlanFineCFOEstimate(rxLLTF, cfgEHT.ChannelBandwidth);
rx = frequencyOffset(rx, simParameters.SampleRate, -fineFrequencyOffset);
rxHELTF = rx(packetOffset + (ind.EHTLTF(1) : ind.EHTLTF(2)), :);
heltfDemod = wlanEHTDemodulate(rxHELTF, "EHT-LTF", cfgEHT);
[chanEstimate, pilotEstimate] = wlanEHTLTFChannelEstimate(heltfDemod, cfgEHT);
cfrMagnitudes(:, end + 1) = abs(chanEstimate(:, 1, 1));
rxData = rx(packetOffset + (ind.EHTData(1) : ind.EHTData(2)), :);
demodSym = wlanEHTDemodulate(rxData, "EHT-Data", cfgEHT);
demodSym = wlanEHTTrackPilotError(demodSym, chanEstimate, cfgEHT, "EHT-Data");
nVarEst = wlanEHTDataNoiseEstimate(demodSym(ofdmInfo.PilotIndices, :, :),pilotEstimate, cfgEHT);
demodDataSym = demodSym(ofdmInfo.DataIndices, :, :);
chanEstimateData = chanEstimate(ofdmInfo.DataIndices, :, :);
[eqSym, csi] = wlanEHTEqualize(demodDataSym, chanEstimateData, nVarEst, cfgEHT, 'EHT-Data');
rxPSDU = wlanEHTDataBitRecover(eqSym, nVarEst, csi, cfgEHT);
numPacketErrors = numPacketErrors + any(biterr(txPSDU, rxPSDU));
end
end
lab_5/task1.m
+45
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satSim = create_satellite_sim(satConfig, groundStation);
% viewer = satelliteScenarioViewer(satSim.sc);
sampleTimes = satConfig.startTime:seconds(satConfig.sampleTime):satConfig.stopTime;
distancesToSat = zeros(size(sampleTimes));
elevationAnglesToSat = zeros(size(sampleTimes));
progressStartText = "Starting ...";
f = waitbar(0, progressStartText, "Name", "Task 1");
progressTotal = numel(sampleTimes);
progressQueue = parallel.pool.DataQueue;
parfor_waitbar(f, progressTotal, progressStartText, true);
progressListener = afterEach(progressQueue, @(info) parfor_waitbar(f, progressTotal, info, false));
parfor idx = 1:numel(sampleTimes)
res = perform_access_analysis(satSim, sampleTimes(idx));
distancesToSat(idx) = res.distanceToSatellite;
elevationAnglesToSat(idx) = res.elevationAngleToSatellite;
send(progressQueue, sprintf("Index %d", idx));
end
delete(progressListener);
if ishandle(f)
close(f);
end
figure;
plot(sampleTimes, distancesToSat);
grid on;
xlabel("Time [s]");
ylabel("Distance to Satellite [m]");
title("Distance over time plot of satellite pass");
figure;
plot(sampleTimes, elevationAnglesToSat);
grid on;
xlabel("Time [s]");
ylabel("Elevation angle to satellite [degree]");
title("Elevation angle over time plot of satellite pass");
accessAnalysisResults.times = sampleTimes;
accessAnalysisResults.distances = distancesToSat;
accessAnalysisResults.elevationAngles = elevationAnglesToSat;
lab_5/task2.m
+64
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profile = "C";
bandwidth = 20;
include_free_space_pathloss = true;
delay_model = "None";
carrier_frequency = 2.4e9;
mobile_speed = 0;
mobile_altitude = groundStation.Altitude;
satellite_altitude = satConfig.satAltitude;
random_stream = "mt19937ar with seed";
seed = 666;
tx_antenna_count = 1;
rx_antenna_count = 1;
apep = 1000;
txPower = 20;
wifiSensitivity = -85;
reliableRxPower = -75;
amplifierGain = 30;
[cfgEHT, simParameters, channel, chInfo, maxChDelay, satelliteDopplerShift, chanBW] = create_baseline_configuration(profile, bandwidth, include_free_space_pathloss, delay_model, carrier_frequency, mobile_speed, mobile_altitude, satellite_altitude, random_stream, seed, tx_antenna_count, rx_antenna_count, apep);
cfgEHT.User{1}.MCS = 3;
simParameters.TransmitPower = txPower;
[~, numPacketsSimulated, ~, rxPower, pathLoss] = simulateTransmission(accessAnalysisResults, cfgEHT, channel, maxChDelay, [], inf, simParameters);
packetIdx = 1:numPacketsSimulated;
packetTimes = accessAnalysisResults.times(packetIdx);
rxPower = rxPower(packetIdx);
pathLoss = pathLoss(packetIdx);
figure;
plot(packetTimes, rxPower);
grid on;
xlabel("Time");
ylabel("Power [dBm]");
title("Receive power over time plot of satellite pass");
yline(wifiSensitivity, "--", "receive sensitivity -85 dBm");
yline(reliableRxPower, "--", "reliable reception -75 dBm");
lambda = physconst("lightspeed") / carrier_frequency;
maxPathLossDetectable = txPower - wifiSensitivity;
maxDistanceDetectable = lambda / (4 * pi) * 10^(maxPathLossDetectable / 20);
maxPathLossReliable = txPower - reliableRxPower;
maxDistanceReliable = lambda / (4 * pi) * 10^(maxPathLossReliable / 20);
requiredTxPower = reliableRxPower + pathLoss;
figure;
plot(packetTimes, requiredTxPower);
grid on;
xlabel("Time");
ylabel("Power [dBm]");
title("Required transmit power for -75 dBm receive power");
amplifiedTxPower = txPower + amplifierGain;
requiredAntennaGain = max(requiredTxPower - amplifiedTxPower, 0);
validRequiredTxPower = requiredTxPower(isfinite(requiredTxPower));
validRequiredAntennaGain = requiredAntennaGain(isfinite(requiredAntennaGain));
fprintf("Maximum detectable distance at %.0f dBm TX power: %.2f km\n", txPower, maxDistanceDetectable / 1e3);
fprintf("Maximum reliable distance at %.0f dBm TX power: %.2f km\n", txPower, maxDistanceReliable / 1e3);
fprintf("Required TX power for -75 dBm reception: %.2f dBm to %.2f dBm\n", min(validRequiredTxPower), max(validRequiredTxPower));
fprintf("Required antenna gain with %.0f dB amplifier: %.2f dB to %.2f dB\n", amplifierGain, min(validRequiredAntennaGain), max(validRequiredAntennaGain));