The broadcast channels (BC), a single transmitter
transmitting data to multiple receivers, have been widely studied
in literature mostly with and sometimes without the availability
of channel state information at the transmitter (CSIT). We study
a very practical version of the BC where the transmitter has
CSIT of some users and no CSIT for other users.
We look at the simplest instance of such a heterogeneous BC
where a multi-antenna transmitter base-station (BS) is trying to
communicate data to two single-antenna user equipments (UEs),
having the perfect CSIT about UE-1 and no CSIT about UE-
2. We propose a very simple transmission strategy at the BS
combined with an intelligent interference-aware receiver at UE-
2. We show that under the proposed transmission strategy, the
sum rate can be significantly improved (unbounded in SNR) if
low complexity interference-aware receiver is employed at UE-2
as compared to the case when UEs resort to suboptimal singleuser
detection where rates are bounded (in SNR). We then extend
the proposed transmission strategy to long term evolution (LTE)
scenario and show that the employment of interference aware
receivers significantly improve performance in spite of the low
resolution LTE precoders. It therefore underlines the necessity of
intelligent receivers for modern wireless systems in the pursuit
of high spectral efficiency.
