A digital communication receiver communicates with a digital communication transmitter
across a communication channel and has: a channel estimator, which provide a channel
estimate of the communication channel based on a received signal; an equalizer,
which estimates a sequence of transmitted symbols and provides a sequence of decided
symbols based on the received signal and the channel estimate; and a channel tracker,
which produces an updated channel estimate based on the received signal and the
decided symbols, and which supplies the updated channel estimate to the equalizer.
The digital communication receiver has a controller, which receives channel quality
indicative data associated with an output from the equalizer, determines whether
these data fail to meet a predetermined criterion, and, if so, supplies an enabling
control signal to the channel tracker.
