System object: comm.OFDMModulator
Package: comm
Provide dimensioning information for the OFDM method
Y = info(H)
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.
Dimensions of the modulator input data, Ndata-by-Nsym-by-Nt, where Ndata is the number of data subcarriers such that Ndata = NFFT − NleftG − NrightG − NDCNull − Npilot − NcustNull.
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 |
Dimensions of the pilot input array, Npilot-by-Nsym-by-Nt.
Dimensions of the modulator output data, (NFFT + NCP)×Nsym-by-Nt, where NCP is the length of the cyclic prefix.