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http://dx.doi.org/10.3837/tiis.2015.06.003

Interference Alignment Based Transceiver Design in OSG mode of HetNets  

Niu, Qin (Beijing Key Laboratory of Network System Architecture and Convergence, Beijing University of Posts and Telecommunications)
Zeng, Zhimin (Beijing Key Laboratory of Network System Architecture and Convergence, Beijing University of Posts and Telecommunications)
Zhang, Tiankui (Beijing Key Laboratory of Network System Architecture and Convergence, Beijing University of Posts and Telecommunications)
Hu, Zhirui (Beijing Key Laboratory of Network System Architecture and Convergence, Beijing University of Posts and Telecommunications)
Publication Information
KSII Transactions on Internet and Information Systems (TIIS) / v.9, no.6, 2015 , pp. 2014-2034 More about this Journal
Abstract
This paper focuses on solving co-channel interference (CCI) issues arising in the open subscriber group (OSG) mode of heterogeneous networks (HetNets). Considering a general framework consisting of arbitrary number of picocells within a macro cell, where the inter-user interference (IUI) is the main CCI to macro user equipments (UEs), while the the inter-cell interference (ICI) is the major CCI to pico UEs. In this paper, three IA based transceiver design schemes are proposed. For macro cell, we uniformly use block diagonalization (BD) scheme to eliminate the IUI. And for picocells, three IA schemes are proposed to mitigate the ICI. The first scheme, named as zero forcing IA (ZF-IA) scheme, aligns the inter picocell interference onto an arbitrary sub-space of the cross-tier interference using ZF scheme. Considering the channel state information (CSI) of the desired channel of pico UEs, the second scheme, named as optimal desired sub-channel selected IA (ODC-IA) scheme, aligns the inter picocell interference onto a certain sub-space of the cross-tier interference, which guarantees the largest channel gain of the desired signal of pico UEs. The third IA scheme, named as maximum cross-tier interference selected IA (MI-IA) scheme, is designed for the system with less receive antennas. The inter picocell interference is aligned onto the space of the strongest cross-tier interference and only the interference on this space is nullified. The complexity analysis and simulations show that the proposed transceiver design schemes outperform the existing IA schemes in the OSG mode of HetNets, and the MI-IA scheme reduces the requirement of the receive antennas number with lower complexity.
Keywords
Heterogeneous networks; open subscriber group; transceiver design; interference alignment;
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Times Cited By KSCI : 2  (Citation Analysis)
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