showResourceMapping

Show the subcarrier mapping of the OFDM symbols created by the OFDM modulator System object

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Syntax

showResourceMapping(hMod)
showResourceMapping(hMod,ci)

Description

example

showResourceMapping(hMod) shows a visualization of the subcarrier mapping for the OFDM symbols created by the OFDM modulator System object™.

showResourceMapping(hMod,ci) uses the values in input ci to number the subcarrier indices that the function displays. The subcarrier indices are numbered from 1 to ciNFFT, where NFFT is the number of FFT points.

Examples

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Open Live Script

Create and display an OFDM modulator System object™ with default property values. 

hMod = comm.OFDMModulator
hMod = 
  comm.OFDMModulator with properties:

               FFTLength: 64
    NumGuardBandCarriers: [2x1 double]
            InsertDCNull: false
          PilotInputPort: false
      CyclicPrefixLength: 16
               Windowing: false
              NumSymbols: 1
     NumTransmitAntennas: 1

Modify the number of subcarriers and symbols. 

hMod.FFTLength = 128;
hMod.NumSymbols = 2;

Verify that the number of subcarriers and the number of symbols changed. 

disp(hMod)
  comm.OFDMModulator with properties:

               FFTLength: 128
    NumGuardBandCarriers: [2x1 double]
            InsertDCNull: false
          PilotInputPort: false
      CyclicPrefixLength: 16
               Windowing: false
              NumSymbols: 2
     NumTransmitAntennas: 1

Use the showResourceMapping object function to show the mapping of data, pilot, and null subcarriers in the time-frequency space.

showResourceMapping(hMod)

Input Arguments

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OFDM modulator, specified as a comm.OFDMModulator System object.

Subcarrier indices to visualize, specified as a two-element row vector of integers. ci should satisfy diff(ci) = NFFT − 1.

See Also

Functions

Objects

Introduced in R2014a

Communications Toolbox Documentation

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