Abstract
The interference of a two-cell two-hop multi-input–multi-output (MIMO) heterogeneous network where the cell-center user (CCU) coexists with the cell-edge user (CEU) is complex to characterize and costly to suppress. In downlink, the CEU is assumed to be served by a half-duplex relay with amplify-and-forward mode. To suppress the intra-cell and inter-cell interference, a cross time slot partial interference alignment (TPIA) scheme, which aligns the interference terms generated in different sub-time slots to the same subspace, is proposed in this paper. Furthermore, the feasibility condition of antenna configuration is analyzed. Simulation results indicate that the TPIA scheme outperforms other existing conventional techniques in achievable sum degrees of freedom and sum-rate performance.
Highlights
Using relays in multi-user wireless communication systems can effectively extend the coverage area and improve the throughput of a network [1]
We focus on the scenario mentioned above where the cell-center user (CCU) directly served by base station (BS) coexists with the cell-edge user (CEU) served through a two-hop link constructed by an AF modal relay
We propose a cross time slot partial interference alignment (TPIA) scheme to deal with different kinds of interference
Summary
Cai Qin 1,2 , Chaowei Wang 1,2, *, Du Pan 1,2 , Weidong Wang 1,2 and Yinghai Zhang 1,2. Key Laboratory of Universal Wireless Communications, Ministry of Education, Beijing University of Posts and Telecommunications, Beijing 100876, China. Received: 26 December 2018; Accepted: 11 February 2019; Published: 15 February 2019
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