Mixed CSIT DL channel : gains with interference aware receivers

Ghaffar, Rizwan; Salim, Umer; Ghauri, Irfan; Knopp, Raymond
EW 2011, 17th European Wireless Conference, Sustainable Wireless Technologies, April, 27-29, 2011, Vienna, Austria

Best Student Paper Award







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.

Systèmes de Communication
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