satelliteCNR

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

Since R2022b

Syntax

[cn,info] = satelliteCNR(cfg)

Description

[cn,info] = satelliteCNR(cfg) computes the carrier-to-noise ratio (CNR) cn for the satellite link budget parameters specified in the configuration cfg. The function also returns the intermediate results in the CNR calculation info based on the link budget parameters specified in cfg.

Examples

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

Input Arguments

cfg — CNR configuration object

satelliteCNRConfig object

CNR configuration object, specified as a satelliteCNRConfig object.

Output Arguments

cn — Carrier-to-noise ratio

scalar

Carrier-to-noise ratio in dB, returned as a scalar.

Data Types: double

info — Intermediate results in CNR calculation

structure

Intermediate results in the CNR calculation, based on the link budget parameters specified in the configuration object cfg returned as a structure with these fields.

Structure Field	Description
TransmitterEIRP	Effective isotropic radiated power (EIRP) of the transmitter antenna, returned as a scalar. Value is in dBW.
FSPL	Free space path loss (FSPL) from the transmitter to the receiver antenna, returned as a scalar. Value is in dB.
ReceivedIsotropicPower	Received isotropic power at the receiver antenna, returned as a scalar. Value is in dBW.
CarrierToNoiseDensityRatio	Carrier-to-noise power density ratio (C/No), returned as a scalar. Value is in dB-Hz.
ReceivedEbNo	Received energy per bit to noise power density ratio (Eb/No), returned as a scalar. Value is in dB.
ReceivedEsNo	Received energy per symbol to noise power density ratio (Es/No), returned as a scalar. Value is in dB.

All fields in the structure are of data type double.

Data Types: struct

Extended Capabilities

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

Version History

Introduced in R2022b