wlanSegmentDeparseSymbols

Segment-deparse data subcarriers

Syntax

y = wlanSegmentDeparseSymbols(sym,cbw)

Description

y = wlanSegmentDeparseSymbols(sym,cbw) performs segment deparsing on the input sym as per IEEE^® 802.11™-2020, Section 21.3.10.9.3, when cbw is 'CBW16' or 'CBW160'.

Note

Segment deparsing of the data subcarriers applies only when the channel bandwidth is either 16 MHz or 160 MHz, and is bypassed for the remaining channel bandwidths (as stated in the aforementioned section of IEEE 802.11-2020). Therefore, when cbw is any accepted value other than 'CBW16' or 'CBW160', wlanSegmentDeparseSymbols returns the input unchanged.

Examples

Segment-Deparse Symbols

Segment-deparse the symbols in four OFDM symbols for a VHT configuration with a channel bandwidth of 16 MHz and 3 spatial streams.

Define the input parameters. Since the channel bandwidth is 16 MHz, set the number of data subcarriers to 468 and the number of frequency segments to two.

chanBW = 'CBW16';
numSD = 468; 
numSym = 4;
numSS = 3;
numSeg = 2;

Create the input sequence of symbols.

data = randi([0 1],numSD/numSeg,numSym,numSS,numSeg);

Segment-deparse the symbols into data subcarriers. The first dimension of the parsed output accounts for the total number of data subcarriers.

deparsedData = wlanSegmentDeparseSymbols(data,chanBW);
size(deparsedData)

ans = 1×3

   468     4     3

Get Symbol Order for VHT Configuration

Get the symbol order after stream deparsing a sequence for a VHT configuration with a channel bandwidth of 160 MHz and one spatial stream.

Define the input parameters. Since the channel bandwidth is 160 MHz, set the number of data subcarriers to 468 and the number of frequency segments to two.

chanBW = "CBW160";
numSD = 468;  
numSym = 1;
numSS = 1;
numSeg = 2; 

Create the input sequence of symbols.

sequence = (1:numSD*numSym*numSS).';
inp = reshape(sequence,numSD/numSeg,numSym,numSS,numSeg);

Segment-deparse the symbols. The output is a column vector with the sequence order of the symbols.

deparsedData = wlanSegmentDeparseSymbols(inp,chanBW);
deparsedData(1:10)

ans = 10×1

     1
     2
     3
     4
     5
     6
     7
     8
     9
    10

Input Arguments

sym — Input sequence

4-D array

Input sequence of frequency segments to deparse, specified as an (N_SD/N_SEG)-by-N_SYMby-N_SS-by-N_SEG array, where:

• N_SD is the number of data subcarriers.

• N_SEG is the number of segments. When cbw is 'CBW16' or 'CBW160', N_SEG is 2. Otherwise it is 1.

• N_SYM is the number of OFDM symbols.

• N_SS is the number of spatial streams.

Data Types: double
Complex Number Support: Yes

cbw — Channel bandwidth

'CBW1' | 'CBW2' | 'CBW4' | 'CBW8' | 'CBW16 | 'CBW20' | 'CBW40' | 'CBW80' | 'CBW160'

Channel bandwidth in MHz, specified as 'CBW1','CBW2', 'CBW4','CBW8', 'CBW16', 'CBW20', 'CBW40', 'CBW80', or 'CBW160'.

Example: 'CBW160'

Data Types: char | string

Output Arguments

y — Deparsed frequency segments

3-D array

Deparsed frequency segments, specified as an N_SD-by-N_SYM-by-N_SS array, where:

• N_SD is the number of data subcarriers.

• N_SYM is the number of OFDM symbols.

• N_SS is the number of spatial streams.

Extended Capabilities

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

Version History

Introduced in R2017b