wlanBCCInterleave

Interleave binary convolutionally encoded input

Syntax

y = wlanBCCInterleave(bits,type,numCBPSSI,cbw)

y = wlanBCCInterleave(bits,type,numCBPSSI)

Description

y = wlanBCCInterleave(bits,type,numCBPSSI,cbw) outputs the interleaved binary convolutionally encoded (BCC) input bits for a specified interleaver type, as defined in IEEE^® 802.11™-2012 Section 18.3.5.7, IEEE 802.11ac™-2013 Section 22.3.10.8, and IEEE 802.11ah™ Section 24.3.9.8. numCBPSSI specifies the number of coded bits per OFDM symbol per spatial stream per interleaver block and cbw specifies the channel bandwidth.

y = wlanBCCInterleave(bits,type,numCBPSSI) outputs the interleaved input bits for the non-HT interleaver type.

Examples

Interleave VHT Data Field

Perform BCC interleaving for the VHT interleaving type.

Define the input parameters. Set the number of coded bits per OFDM symbol per spatial stream per interleaver block to 52, the channel bandwidth to 20 MHz, and the number of spatial streams to 4.

numCBPSSI = 52;
cbw = 'CBW20';
numSS = 4;

Create a sequence of bits for two OFDM symbols, four spatial streams, and one segment.

inBits = randi([0 1],2*numCBPSSI,numSS,1,'int8');

Perform BCC interleaving on the bits.

out = wlanBCCInterleave(inBits,'VHT',numCBPSSI,cbw);

Interleave Non-HT Data Field

Perform BCC interleaving for the non-HT interleaving type.

Define the input parameters. Set the number of coded bits per OFDM symbol per spatial stream per interleaver block to 48.

numCBPSSI = 48;

Create a sequence of random bits for one OFDM symbol, one spatial stream, and one segment.

inBits = randi([0 1],numCBPSSI,1);

Perform BCC interleaving on the bits.

out = wlanBCCInterleave(inBits,'Non-HT',numCBPSSI);

Compare the original sequence with the interleaved one.

[inBits out]

ans = 48×2

     1     1
     1     0
     0     0
     1     1
     1     1
     0     0
     0     0
     1     1
     1     0
     1     1
      ⋮

Interleave Sequence

Get the interleaving sequence of a non-HT interleaver type.

Define the input parameters. Set the number of coded bits per OFDM symbol per spatial stream per interleaver block to 192.

numCBPSSI = 192;

Create a numeric sequence from 1 to numCBPSSI.

seq = (1:numCBPSSI).';

Perform BCC interleaving on the numeric sequence.

intSeq = wlanBCCInterleave(seq,'Non-HT',numCBPSSI);
intSeq(1:10)

ans = 10×1

     1
    17
    33
    49
    65
    81
    97
   113
   129
   145

Input Arguments

bits — Input sequence

matrix | 3-D array

Input sequence containing binary convolutionally encoded (BCC) data, specified as an (N_CBPSSI×N_SYM)-by-N_SS-by-N_SEG array, where:

• N_CBPSSI is the number of coded bits per OFDM symbol per spatial stream per interleaver block.

• N_SYM is the number of OFDM symbols.

• N_SS is the number of spatial streams.

  • If type= 'Non-HT', then N_SS must be 1.

  • If type= 'VHT', then N_SS must be from 1 to 8.

• N_SEG is the number of segments.

Data Types: double | int8

type — Type of interleaving

'VHT' | 'Non-HT'

The type of interleaving, specified as 'VHT' or 'Non-HT'.

Data Types: char | string

numCBPSSI — Number of coded bits per OFDM symbol per spatial stream per interleaver block

positive integer

Number of coded bits per OFDM symbol per spatial stream per interleaver block specified as a positive integer. As defined in IEEE 802.11ac-2013 Table 22-6, the value of numCBPSSI depends on the interleaving type:

'Non-HT'	NSD×NBPSCS
'VHT'	NSD×NBPSCS/NSEG

where:

• N_SD is the number of data subcarriers.

• N_BPSCS is the number of coded bits per subcarrier per spatial stream, specified as 1, 2, 4, 6, or 8.

• N_SEG is the number of segments.

When type= 'Non-HT', numCBPSSI can be 48, 96, 192, 288, and 384, since N_CBPSSI = 48 × N_BPSCS.

When type= 'VHT', numCBPSSI can be 24, 48, 96, 144, and 192, since N_CBPSSI = 24 × N_BPSCS.

Data Types: double

cbw — Channel bandwidth

'CBW1' | 'CBW2' | 'CBW4' | 'CBW8' | 'CBW10' | 'CBW16 | 'CBW20' | 'CBW40' | 'CBW80' | 'CBW160'

Channel bandwidth in MHz, specified as 'CBW1','CBW2', 'CBW4','CBW8', 'CBW10', 'CBW16', 'CBW20', 'CBW40', 'CBW80', or 'CBW160'. When the interleaver type is set to 'Non-HT', then cbw is optional.

Data Types: char | string

Output Arguments

y — Interleaved output

matrix | 3-D array

Interleaved output, returned as an (N_CBPSSI×N_SYM)-by-N_SS-by-N_SEG array, where:

• N_CBPSSI is the number of coded bits per OFDM symbol per spatial stream per interleaver block.

• N_SYM is the number of OFDM symbols.

• N_SS is the number of spatial streams.

• N_SEG is the number of segments.

Extended Capabilities

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

Version History

Introduced in R2017b