showResourceMapping

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

Syntax

showResourceMapping(hMod)

showResourceMapping(hMod,ci)

Description

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 ciN_FFT, where N_FFT is the number of FFT points.

Examples

Create and Modify OFDM Modulator

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

hMod — System object to visualize

comm.OFDMModulator System object

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

ci — Subcarrier indices to visualize

[1,…,NFFT] (default) | two-element row vector of integers

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

Version History

Introduced in R2014a