Trellis Coded Modulation
n Combined coding and modulation.
n Error correcting capabilities without the sacrifice of
information bit rate.
n e.g. if a BPSK modulation technique is used for
transmission, one can add a rate 1/2 convolutional
encoder and use QPSK modulation.
n Set partitioning is used to ensure performance
n The distance here is no longer Hamming but rather
Euclidean distance.
n Encoding and decoding is as convolutional codes,
except that one deals with symbols rather than bits.