info

System initialization

Define simulation parameters and create objects for OQPSK modulation and demodulation.

sps = 12; % samples per symbol
bits = randi([0,1],800,1); % transmission data

oqpskMod = comm.OQPSKModulator( ...
    'BitInput',true, ...
    'SamplesPerSymbol',sps, ...
    'PulseShape','Root raised cosine');
oqpskDemod = comm.OQPSKDemodulator(oqpskMod);

Waveform transmission and reception

Use the modulator object to apply OQPSK modulation and transmit filtering to the input data.

oqpskWaveform = oqpskMod(bits);

Pass the waveform through a channel.

snr = 0;
rxWaveform = awgn(oqpskWaveform,snr);

Use the demodulator object to apply receive filtering and OQPSK demodulation to the waveform.

demodData = oqpskDemod(rxWaveform);

Use the info object function to determine the system delay. As shown, you can also compute the system delay based on the filter span in symbols and the configured data option for the modulator or demodulator.

oqpskdemodInfo = info(oqpskDemod)

oqpskdemodInfo = struct with fields:
    DecimationFactor: 12
               Delay: 20

delay = oqpskdemodInfo.Delay;
delay_mod = (1+oqpskMod.BitInput)*oqpskMod.FilterSpanInSymbols

delay_mod = 
20

delay_demod = (1+oqpskDemod.BitOutput)*oqpskDemod.FilterSpanInSymbols

delay_demod = 
20

Compute the bit error rate to confirm the quality of the data recovery.

[~, ber] = biterr(bits(1:end-delay),demodData(delay+1:end))

ber = 
0