Hesham M. al-Salman Nov 2001
25
Trellis Coded Modulation
nCombined
coding and modulation.
nError
correcting capabilities without the sacrifice of information
bit rate.
ne.g. if
a BPSK modulation technique is used for transmission, one can add a rate
1/2 convolutional encoder and use QPSK modulation.
nSet
partitioning is used to ensure performance enhancement.
nThe
distance here is no longer Hamming but rather Euclidean
distance.
nEncoding
and decoding is as convolutional codes, except that one deals with symbols
rather than bits.