wlanStreamParse

Stream-parse encoded streams

Syntax

y = wlanStreamParse(bits,numSS,numCBPS,numBPSCS)

Description

y = wlanStreamParse(bits,numSS,numCBPS,numBPSCS) stream-parses encoded streams bits into numSS spatial streams for the specified number of coded bits per OFDM symbol, numCBPS, and coded bits per subcarrier per spatial stream, numBPSCS. The function implements the operation defined in sections 19.3.11.8.2 and 21.3.10.6 of [1] and section 27.3.12.6 of [2].

Examples

Stream-Parse Input Bits

Stream-parse three OFDM symbols with two encoded streams into five spatial streams.

Specify the number of coded bits per OFDM symbol, coded bits per subcarrier per spatial stream, encoded streams, spatial streams, and OFDM symbols.

numCBPS = 3240;
numBPSCS = 6;
numES = 2;
numSS = 5;
numSym = 3;

Create a random encoded stream of bits.

bits = randi([0 1],numCBPS*numSym/numES,numES,"int8");

Stream-parse the encoded stream.

y = wlanStreamParse(bits,numSS,numCBPS,numBPSCS);

Verify the size of the stream-parsed bits.

size(y)

ans = 1×2

        1944           5

Get Bit Order After Stream Parsing

Get the bit order of an OFDM symbol after stream-parsing one encoded stream into three spatial streams.

Specify the number of coded bits per OFDM symbol, coded bits per subcarrier per spatial stream, encoded streams, spatial streams, and OFDM symbols.

numCBPS = 156;
numBPSCS = 1;
numES = 1;
numSS = 3;
numSym = 1;

Create an input sequence of ordered symbols with appropriate dimensions.

sequence = (1:numCBPS*numSym).';
bits = reshape(sequence,numCBPS*numSym/numES,numES);

Stream-parse the symbols.

y = wlanStreamParse(bits,numSS,numCBPS,numBPSCS);

Input Arguments

bits — Encoded streams

real-valued matrix

Encoded streams, specified as a real-valued matrix of size (N_CBPS × N_Sym ÷ N_ES)-by-N_ES.

• N_CBPS is the number of coded bits per OFDM symbol (that is, the numCBPS input).

• N_Sym is the number of OFDM symbols.

• N_ES is the number of encoded streams.

Data Types: single | double | int8

numSS — Number of spatial streams

positive integer

Number of spatial streams, specified as a positive integer.

Data Types: double

numCBPS — Number of coded bits per OFDM symbol

positive integer

Number of coded bits per OFDM symbol, specified as a positive integer. This value is typically N_BPSCS × N_SS × N_SD, where:

• N_BPSCS is the number of coded bits per subcarrier per spatial stream (that is, the numBPSCS input).

• N_SS is the number of spatial streams.

• N_SD is the number of complex data numbers per frequency segment.

Data Types: double

numBPSCS — Number of coded bits per subcarrier per spatial stream

1 | positive even integer

Number of coded bits per subcarrier per spatial stream, specified as 1 or a positive even integer.

Data Types: double

Output Arguments

y — Stream-parsed data

real-valued matrix

Stream-parsed data, returned as a real-valued matrix of size (N_CBPSS × N_Sym)-by-N_SS.

• N_CBPSS is the number of coded bits per OFDM symbol per spatial stream.

• N_Sym is the number of OFDM symbols.

• N_SS is the number of spatial streams.

The function returns this output with the same data type as the bits input.

Data Types: single | double | int8

References

[1] IEEE Std 802.11™-2020 (Revision of IEEE Std 802.11-2016). “Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications.” IEEE Standard for Information Technology — Telecommunications and Information Exchange between Systems — Local and Metropolitan Area Networks — Specific Requirements.

[2] IEEE^® Std 802.11ax™-2021 (Amendment to IEEE Std 802.11-2020). “Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications. Amendment 1: Enhancements for High Efficiency WLAN.” IEEE Standard for Information Technology — Telecommunications and Information Exchange between Systems. Local and Metropolitan Area Networks — Specific Requirements.

Extended Capabilities

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

Version History

Introduced in R2017b