Achievable Rates of Gaussian Broadcast Channel with Interference

—In this paper, we study the achievable region for a Gaussian broadcast channel in the presence of an additional interference at the receivers. We consider that a noisy version of this interference is known to the transmitter and the receivers. A nested lattice code coupled with a dirty paper code is used to compute the achievable region. A two phase causal encoding technique is also proposed in which the interference signal is estimated at the end of the first phase and then the desired signal is transmitted in the second phase. Numerical results show that causal knowledge of the interference can significantly improve the achievable rate region over a scheme that does not use interference cancellation. Results are also shown when the transmitter operates in both half-duplex and fullduplex modes.