  In this paper, we investigate network nest coded modulation schemes for
multiple access relay channels. The performance of the distributed systems
which are based on distributed convolutional codes with network coded
modulation is presented. An analytical upper bound on bit error probability
performance for the studied distributed systems with Maximum Likelihood
Sequence Detection (MLSD) is derived. The constructured bounds for the
investigated systems are shown to be asymptotically tight for increasing
channel Signal-to-Noise Ratio (SNR) values
