symdemap
Maps a symbol sequence to a binary sequence with binary or gray decoding
Calling sequence
b = symdemap(x,k[,enc])
b = symdemap(x,k[,enc])
Parameters
- x:
Input symbol vector (real or complex, depending on the encoding)
- k:
Number of bits / symbol
- enc:
Specify binary ('b', default), qam ('q'), or phase ('p') encoding
- b:
Output binary sequence (a vector of 0 and 1)
Input symbol vector (real or complex, depending on the encoding)
Number of bits / symbol
Specify binary ('b', default), qam ('q'), or phase ('p') encoding
Output binary sequence (a vector of 0 and 1)
Description
Maps a symbol sequence to a binary sequence (sequence of 0 or 1), using one of the following possible encodings:
- Binary encoding (PAM / NRZ) /
enc = 'b': produces a vector of real symbols, uniformly distribued between -1 and 1 (if k = 2, only -1 and 1 are produced, e.g. NRZ encoding). - Phase encoding (PSK) /
enc = 'p': produces complex symbols of unit magnitude and uniformly distribued phase between 0 and
radians (for k = 1 bit/symbol, this is BPSK, which symbols are identical to NRZ, for k = 2 bits/symbol, this is QPSK, ...). - Quadrature amplitude Encoding (QAM) /
enc = 'q': produces complex symbols where real and imaginary parts of the signal are independently modulated using each one half of the bitstream.
Example
b = symdemap([-1 1 1 -1], 1, 'b') // NRZ decoding |