satelliteCNRConfig

Carrier-to-noise ratio configuration parameters

Since R2022b

Description

Use the satelliteCNRConfig object to create a carrier-to-noise ratio (CNR) configuration object with default or specified values.

Creation

Syntax

cfg = satelliteCNRConfig

cfg = satelliteCNRConfig(Name=Value)

Description

cfg = satelliteCNRConfig creates a default CNR configuration object.

This object contains the parameters required to calculate a satellite link budget CNR.

cfg = satelliteCNRConfig(Name=Value) sets properties using one or more name-value arguments. For example, TransmitterPower=20 sets the transmitter power to 20 dBW.

Properties

TransmitterPower — Transmitter power

10 (default) | real scalar

Transmitter power in dBW, specified as a real scalar.

Data Types: double

TransmitterSystemLoss — Total system loss of the transmitter

0 (default) | nonnegative real scalar

Total system loss of the transmitter in dB, specified as a nonnegative real scalar.

Data Types: double

TransmitterAntennaGain — Transmitter antenna gain

10 (default) | nonnegative real scalar

Transmitter antenna gain in dBi, specified as a nonnegative real scalar.

Data Types: double

Distance — Distance between transmitter and receiver antenna

3786 (default) | nonnegative real scalar

Distance between the transmitter and the receiver antenna in km, specified as a nonnegative real scalar.

Data Types: double

Frequency — Signal frequency

14 (default) | positive real scalar

Signal frequency in GHz, specified as a positive real scalar.

Data Types: double

MiscellaneousLoss — Miscellaneous losses

0 (default) | nonnegative real scalar

Miscellaneous losses in dB, specified as a nonnegative real scalar. Major miscellaneous losses include polarization loss, interference loss, and atmospheric attenuation.

Data Types: double

GainToNoiseTemperatureRatio — Receiver gain-to-noise temperature ratio

3 (default) | real scalar

Receiver gain-to-noise temperature ratio in the direction of the transmitting antenna, specified as a real scalar. Value is in dB/K.

Data Types: double

ReceiverSystemLoss — Total receiver system loss

0 (default) | nonnegative real scalar

Total receiver system loss in dB, specified as a nonnegative real scalar.

Data Types: double

BitRate — Bit rate of link

10 (default) | positive real scalar

Bit rate of the link in Mbps, specified as a positive real scalar.

Data Types: double

SymbolRate — Symbol rate of link

10 (default) | positive real scalar

Symbol rate of the link in Msym/s, specified as a positive real scalar.

Data Types: double

Bandwidth — Signal bandwidth

6 (default) | positive real scalar

Signal bandwidth in MHz, specified as a positive real scalar.

Data Types: double

Object Functions

satelliteCNR

Carrier-to-noise ratio for configured satellite link budget parameters

Examples

Create Satellite CNR Object

Create a default satellite carrier-to-noise ratio (CNR) object.

Set the bandwidth to 15 MHz and gain-to-noise temperature to 5 dB/K.

cfg = satelliteCNRConfig;
cfg.Bandwidth = 15;
cfg.GainToNoiseTemperatureRatio = 5;

Display the CNR configuration object properties.

disp(cfg)

  satelliteCNRConfig with properties:

               TransmitterPower: 10
          TransmitterSystemLoss: 0
         TransmitterAntennaGain: 10
                       Distance: 3786
                      Frequency: 14
              MiscellaneousLoss: 0
    GainToNoiseTemperatureRatio: 5
             ReceiverSystemLoss: 0
                        BitRate: 10
                     SymbolRate: 10
                      Bandwidth: 15

Calculate CNR and Link Margin

Calculate the CNR and the received link margin for the specified link budget parameters.

Create a default CNR configuration object, and then set its properties.

cfg = satelliteCNRConfig;
cfg.TransmitterPower = 17;               % in dBW
cfg.TransmitterSystemLoss = 9;           % in dB
cfg.TransmitterAntennaGain = 38;         % in dBi
cfg.Distance = 40215;                    % in km
cfg.Frequency = 11;                      % in GHz

% Here, miscellaneous losses include polarization loss, interference 
% loss, and antenna mispointing loss, respectively.
polLoss = 3.0103;
intLoss = 2;
antLoss = 1;
cfg.MiscellaneousLoss =  polLoss + intLoss + antLoss; % in dB
cfg.GainToNoiseTemperatureRatio = 25;                 % in dB/K
cfg.ReceiverSystemLoss = 2;                           % in dB
cfg.BitRate = 10;                                     % in Mbps

Display the CNR configuration object properties.

disp(cfg)

  satelliteCNRConfig with properties:

               TransmitterPower: 17
          TransmitterSystemLoss: 9
         TransmitterAntennaGain: 38
                       Distance: 40215
                      Frequency: 11
              MiscellaneousLoss: 6.0103
    GainToNoiseTemperatureRatio: 25
             ReceiverSystemLoss: 2
                        BitRate: 10
                     SymbolRate: 10
                      Bandwidth: 6

Calculate the CNR.

[cn,info] = satelliteCNR(cfg)

cn = 
18.4440

info = struct with fields:
               TransmitterEIRP: 46
                          FSPL: 205.3634
        ReceivedIsotropicPower: -165.3737
    CarrierToNoiseDensityRatio: 86.2255
                  ReceivedEbNo: 16.2255
                  ReceivedEsNo: 16.2255

Compute the link margin. Assume a required energy per bit to noise power density ratio (Eb/No) of 10 dB and an implementation loss of 2 dB in the receiver.

reqEbNo = 10;
implLoss = 2;
margin = info.ReceivedEbNo - reqEbNo - implLoss

margin = 
4.2255

Extended Capabilities

C/C++ Code Generation
Generate C and C++ code using MATLAB® Coder™.

Version History

Introduced in R2022b