A wireless communications device may include a housing and a wireless
transmitter and a wireless receiver carried by the housing. The wireless
receiver may include a joint demodulation filter for reducing co-channel
interference between a desired signal and a co-channel interfering signal
which may include an input receiving samples of the desired signal and
the co-channel interfering signal, a Viterbi decoder, and a first signal
path between the input and the Viterbi decoder comprising a first filter.
The joint demodulation filter may further include a second signal path
between the input and the Viterbi decoder and comprising a linear finite
impulse response (FIR) modeler for generating a channel impulse response
estimate for the co-channel interfering signal. Additionally, a third
signal path may be between the input and the Viterbi decoder and include
a whitened matched filter for generating a channel impulse response
estimate for the desired signal.