Perform a 256QAM mapping, as defined in IEEE® 802.11ac™-2013 Section 22.3.10.9.1.

Create the sequence of data bits.

bits = randi([0 1],416,1,'int8');

Perform the constellation mapping on the data bits with a 256QAM modulation.

numBPSCS = 8;
mappedData = wlanConstellationMap(bits,numBPSCS);

The size of the output returned by this modulation equals the size of the input sequence divided by eight.

size(mappedData)

ans = 1×2

    52     1

Perform a $\frac{\pi }{2}$-BPSK mapping on a sequence of data bits as defined in IEEE® 802.11ad™-2012 Section 21.6.3.2.4.

Create the sequence of data bits.

bits = randi([0 1],512,1);

Perform the BPSK mapping on the data bits with a rotation of $\frac{\pi }{2}$ radians. Note that the size of the constellation rotation phase is equal to the size of input sequence.

numBPSCS = 1;
phase = pi*(0:size(bits,1)/numBPSCS-1).'/2;
mappedData = wlanConstellationMap(bits,numBPSCS,phase);

As we performed a BPSK mapping, the number of symbols per bit is one, therefore the size of the output is equal to the size of the original sequence.

size(mappedData)

ans = 1×2

   512     1

Display the modulated signal constellation using the scatterplot function.

scatterplot(mappedData);

Perform BPSK and QBPSK demapping for different OFDM symbols for the VHT-SIG-A field by using a soft demodulation. The mapping is defined in IEEE® 802.11ac™-2013 Section 22.3.8.3.3 for the VHT-SIG-A field.

Create the sequence of data bits. Place the two OFDM symbols in columns.

bits = randi([0 1],48,2,'int8');

Perform constellation mapping on the data bits. Specify the size of constellation rotation phase as the number of columns in the input sequence. The first column is mapped with a BPSK modulation. The second column is modulated with a QBPSK modulation.

numBPSCS = 1;
phase = [0 pi/2];
mappedData = wlanConstellationMap(bits,numBPSCS,phase);

Display the modulated signal constellation by using the scatterplot function. The first plot shows the data after the BPSK modulation, and the second plot shows the QBPSK-modulated symbols.

scatterplot(mappedData(:,1))

scatterplot(mappedData(:,2))