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http://dx.doi.org/10.3837/tiis.2020.01.003

SLNR-based Precoder Design in Multiuser Interference Channel with Channel Estimation Error  

Seo, Bangwon (Electrical, Electronics and Control Engineering, the Institute of IT Convergence Technology (IICT), Kongju National University)
Publication Information
KSII Transactions on Internet and Information Systems (TIIS) / v.14, no.1, 2020 , pp. 40-52 More about this Journal
Abstract
In this paper, we consider a precoder design problem for multiuser interference channel. Most of the conventional schemes for precoder design utilize a signal-to-interference-plus-noise ratio (SINR) as a cost function. However, since the SINR metric of a desired transmitter-receiver pair is a function of precoding vectors of all transmitters in the multiuser interference channel, an analytic closed-form solution is not available for the precoding vector of a desired transmitter that maximizes the SINR metric. To eliminate coupling between the precoding vectors of all transmitters and to find a closed-form solution for the precoding vector of the desired transmitter, we use a signal-to-leakage-plus-noise ratio (SLNR) instead as a cost function because the SLNR at a transmitter is a function of the precoding vector of the desired transmitter only. In addition, channel estimation errors for undesired links are considered when designing the precoding vector because they are inevitable in a multiuser interference channel. In this case, we propose a design scheme for the precoding vector that is robust to the channel estimation error. In the proposed scheme, the precoding vector is designed to maximize the worst-case SLNR. Through computer simulation, we show that the proposed scheme has better performance than the conventional scheme in terms of SLNR, SINR, and sum rate of all users.
Keywords
Channel estimation error; multiuser interference channel; precoder design; signal-to-leakage-plus noise ratio (SLNR);
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