Tuesday, April 1, 1997
4:30-5:30 pm
1003 EECS
Abstract -
Block coded modulation (BCM) is the alternative coded modulation
scheme to trellis coded modulation (TCM). Yamaguchi demonstrated that a
significant coding gain can be obtained at moderate SNR in an 8-PSK based
BCMIM system with length-256 BCH codes. This large coding gain
suggests that introducing interblock memory is an efficient way to
combat the problem of nearest neighbors in a BCM system. However, we
will show that the advantage of introducing interblock memory to a BCM
system is to increase the rate with a fixed distance advantage, or
increase the distance advantage with a fixed rate; both will increase the
asymptotic gain of the coded system and a better performance at moderate
SNR is resulted. In this talk, Upper and lower bounds on the best gain in
terms of additional information bits will be given and several BCMIM
systems with the highest rates for given distance advantages will be
given to demonstrate how the bounds can be applied.
Biosketch -
Not available at this time