Abstract
Recently, full duplex (FD) has been attracting great attention, due to its capability to double the spectral efficiency. In this paper, we focus on a FD wireless communication network, in which a FD base station (BS) and a half duplex (HD) mobile station (MS) exchange their information via a HD relay station (RS) within two phases. An amplify-and-forward (AF) relaying scheme and a decode-and-forward (DF) relaying scheme are proposed for the two-way relay network. In the proposed DF relaying scheme, the RS chooses the best DF relaying mode according to channel state information (CSI) to achieve the maximum capacity. Specifically, the RS can decode and forward data streams from both the BS and MS, or only one of them, or none of them, and thus obtaining a selection diversity gain. In order to analyze the performance of the proposed schemes, achievable rate regions and sum-capacities of the proposed schemes are derived in closed form. Numerical and simulation results show that the proposed relaying schemes provide significant capacity gain.
Highlights
1 Introduction Traditionally, wireless communication nodes operate in half duplex (HD) mode, i.e., in either time division duplex (TDD) mode or frequency division duplex (FDD) mode
The relay station (RS) can decode and forward the data streams from both the base station (BS) and mobile station (MS), only from BS, only from MS, or none of them, which are referred to as bidirectional DF (BDF) mode, downlink DF (DDF) mode, uplink DF (UDF) mode, and no DF (NF) mode, respectively
6 Conclusions We have studied a three-node relay network, where a half duplex RS assists a full duplex BS to communicate with a half duplex MS
Summary
Wireless communication nodes operate in half duplex (HD) mode, i.e., in either time division duplex (TDD) mode or frequency division duplex (FDD) mode. In [33], a relaying system with two FD source nodes and multiple FD RSs is studied, and a relay selection method is proposed for AF relaying scheme to achieve the maximum signal-tointerference-plus-noise ratio (SINR). In the traditional AF relaying scheme, the BS only receive signals at the second phase. In the proposed AF relaying scheme, the BS transmits downlink signal at two phases, obtaining a multiple transmission gain. To achieve the maximum sum-rate, the BS and RS should jointly perform a beamforming to maximize the signal-to-noise ratio (SNR) at the MS’s receiver [39], i.e., the downlink signal is transmitted from the BS and RS simultaneously, but with different phase rotations.
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