info

System object: comm.OFDMModulator
Package: comm

Provide dimensioning information for the OFDM method

Syntax

Y = info(H)


Description

Y = info(H) provides data dimensioning information for the OFDM modulator System object™, H. It returns the expected dimensions for the:

• Input data array

• Pilot data array

• Output data array

The output, Y, is a structure containing the following three fields.

Y.DataInputSize

Dimensions of the modulator input data, N_data-by-N_sym-by-N_t, where N_data is the number of data subcarriers such that N_data = N_FFT − N_leftG − N_rightG − N_DCNull − N_pilot − N_custNull.

Variable Definitions

Variable	Description
NFFT	Number of subcarriers
NleftG	Number of subcarriers in the left guard band
NrightG	Number of subcarriers in the right guard band
NDCNull	Number of subcarriers in the DC null (either 0 or 1)
Npilot	Number of pilot subcarriers
NcustNull	Number of subcarriers used for custom nulls (applies only when the pilot indices property is a 3-D array)
Nt	Number of transmit antennas

Y.PilotInputSize

Dimensions of the pilot input array, N_pilot-by-N_sym-by-N_t.

Y.OutputSize

Dimensions of the modulator output data, (N_FFT + N_CP)×N_sym-by-N_t, where N_CP is the length of the cyclic prefix.