wlanDMGOFDMInfo

OFDM information for DMG transmission

Syntax

info = wlanDMGOFDMInfo

Description

info = wlanDMGOFDMInfo returns info, a structure containing orthogonal frequency-division multiplexing (OFDM) information for the DMG-Data or DMG-Header fields in a directional multi-gigabit transmission.

Examples

Get OFDM Information for DMG-Data Field

Get the OFDM information for the DMG-Data field and display the fast Fourier transform (FFT) length.

info = wlanDMGOFDMInfo;
disp(info.FFTLength)

   512

Demodulate DMG-Data Field and Get OFDM Information

Perform OFDM demodulation on the DMG-Data field, then extract the data and pilot subcarriers.

Generate a WLAN waveform for a DMG transmission, specifying the modulation and coding scheme (MCS).

cfg = wlanDMGConfig('MCS','15');
bits = [1; 0; 0; 1];
waveform = wlanWaveformGenerator(bits,cfg);

Obtain the field indices and extract the DMG-Data field.

ind = wlanFieldIndices(cfg);
rx = waveform(ind.DMGData(1):ind.DMGData(2),:);

Perform OFDM demodulation on the DMG-Data field.

sym = wlanDMGOFDMDemodulate(rx);

Get the OFDM information, then extract the data and pilot subcarriers.

info = wlanDMGOFDMInfo;
data = sym(info.DataIndices,:,:);
pilots =  sym(info.PilotIndices,:,:);

Output Arguments

info — OFDM information

structure

OFDM information, returned as a structure containing these fields.

Name	Values	Description	Data Types
FFTLength	Positive integer	Length of the fast Fourier transform (FFT)	double
SampleRate	Positive scalar	Sample rate of the waveform	double
CPLength	Positive integer	Cyclic prefix length, in samples	double
NumTones	Nonnegative integer	Number of active subcarriers	double
NumSubchannels	Positive integer	Number of 20 MHz subchannels	double
ActiveFrequencyIndices	Column vector of integers in the interval [–FFTLength/2, (FFTLength/2 – 1)]	Indices of active subcarriers. Each element of this field is the index of an active subcarrier, such that the direct current (DC) or null subcarrier is at the center of the frequency band.	double
ActiveFFTIndices	Column vector of integers in the interval [1, FFTLength]	Indices of active subcarriers within the FFT	double
DataIndices	Column vector of integers in the interval [1, NumTones]	Indices of data within the active subcarriers	double
PilotIndices	Column vector of integers in the interval [1, NumTones]	Indices of pilots within the active subcarriers	double

Data Types: struct

Extended Capabilities

C/C++ Code Generation
Generate C and C++ code using MATLAB® Coder™.

Version History

Introduced in R2019a