In this paper, we propound a solution named Cognitive Sub-Small Cell for Sojourners (CSCS) in allusion to a broadly representative small cell scenario, where users can be categorized into two groups: sojourners and inhabitants. CSCS contributes to save energy, enhance the number of concurrently supportable users and enshield inhabitants. We consider two design issues in CSCS: i) determining the number of transmit antennas on sub-small cell APs; ii) controlling downlink inter-sub-small cell interference. For issue i), we excogitate an algorithm helped by the probability distribution of the number of concurrent sojourners. For issue ii), we propose an interference control scheme named BDBF: Block Diagonalization (BD) Precoding based on uncertain channel state information in conjunction with auxiliary optimal Beamformer (BF). In the simulation, we delve into the issue: how the factors impact the number of transmit antennas on sub-small cell APs. Moreover, we verify a significant conclusion: Using BDBF gains more capacity than using optimal BF alone within a bearably large radius of uncertainty region.
Cite
@article{arxiv.1301.1609,
title = {Two Design Issues in Cognitive Sub-Small Cell for Sojourners},
author = {Xin Jin and Abdelwaheb Marzouki and Djamal Zeghlache and Linghe Kong and Athanasios V. Vasilakos},
journal= {arXiv preprint arXiv:1301.1609},
year = {2013}
}
Comments
Small cells, cognitive radio, Multiuser Multiple-Input Multiple-Output (MU-MIMO), Block Diagonalization (BD) precoding based on uncertain Channel State Information (CSI), auxiliary optimal Beamformer (BF)