info

System object: comm.OFDMDemodulator
Package: comm

Provide dimensioning information for the OFDM method

Syntax

Y = info(H)


Description

Y = info(H) provides data dimensioning information for the OFDM demodulator System object™, H. It returns the expected dimensions for data input into the OFDM demodulator, for the pilot output, and for the data output from the demodulator. The output, Y, is a structure containing three fields: InputSize, DataOutputSize, and PilotOutputSize.

Y.InputSize

Gives the dimensions of the demodulator input data, [(N_FFT + N_CP) × N_sym]-by-N_r, where N_FFT is the number of subcarriers, N_CP is the length of the cyclic prefix, N_sym is the number of symbols, and N_r is the number of receive antennas.

Y.DataOutputSize

Shows the dimensions of the demodulator output data, N_data-by-N_sym-by-N_r, 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. The variables are defined as follows:

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

Y.PilotOutputSize

Provides the dimensions of the pilot signal output array, N_pilot-by-N_sym-by-N_r or N_pilot-by-N_sym-by-N_t-by-N_r, depending on the number of transmit antennas.