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, [(NFFT + NCP) × Nsym]-by-Nr, where NFFT is the number of subcarriers, NCP is the length of the cyclic prefix, Nsym is the number of symbols, and Nr is the number of receive antennas.
- Y.DataOutputSize
Shows the dimensions of the demodulator output data, Ndata-by-Nsym-by-Nr, where Ndata is the number of data subcarriers such that Ndata = NFFT − NleftG − NrightG − NDCNull − Npilot − NcustNull. 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, Npilot-by-Nsym-by-Nr or Npilot-by-Nsym-by-Nt-by-Nr, depending on the number of transmit antennas.