In this paper we consider the problem of partial coordinated transmission in the downlink of a wireless heterogeneous network (HetNet). The partial coordination is crucial in trading off system performance with backhaul overhead, and it is achieved through jointly optimizing the base station (BS) clustering and the downlink beamformers. Unlike many existing works, we focus on the practical scenario where the channel state information (CSI) is imperfect/incomplete at the transmitter. Mathematically, we formulate the problem into a penalized stochastic optimization problem, and propose an algorithm that converges almost surely to its stationary solution set. Interestingly, our method does not require any additional computational complexity or memory compared to the existing algorithms using perfect CSI. Effectiveness of our method is validated through numerical experiments.
|Original language||English (US)|
|Number of pages||5|
|State||Published - Oct 31 2014|
|Event||2014 15th IEEE International Workshop on Signal Processing Advances in Wireless Communications, SPAWC 2014 - Toronto, Canada|
Duration: Jun 22 2014 → Jun 25 2014
|Other||2014 15th IEEE International Workshop on Signal Processing Advances in Wireless Communications, SPAWC 2014|
|Period||6/22/14 → 6/25/14|