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In the future millimeter-wave small-cell communication systems, relay cooperation is deemed as one of the promising techniques to realize green communication. In relay cooperative system, the selected relaying mode determines the system performance in some extent. For the commonly used modes, amplify-and-forward (AF) and decode-and-forward (DF), which one should be taken in specific scenario? In this...
In this paper, we study the secrecy outage probability (SOP) of an opportunistic relay selection scheme where an optimal relay is selected based on the delayed feedback from the multi-antenna destination. We present a new exact closed-form expression of the SOP, and two kinds of asymptotic form of SOP are further derived to explicitly show secrecy performance. In addition, we show that the SOP can...
In this paper, in order to reduce error propagation for cooperative systems, we propose and analyze two new threshold-based hybrid relay selection schemes for the three-node cooperative relaying system, named as hybrid amplify-decode-forward relaying (HADF) and direct-amplify-forward relaying (HDAF). When the signal-to-noise ratio (SNR) is higher than the specific threshold, which is designed in HDAF,...
In this paper, a novel opportunistic protocol is proposed for the two-way relaying systems with direct link. Unlike the existing protocols, the proposed protocol opportunistically exploits analog network coding and the direct link. The proposed protocol switches its strategies to support two traffic flows simultaneously or support only one traffic flow based on instantaneous channel conditions. An...
We consider decode-and-forward cooperative networks and we derive analytical expressions as well as tractable asymptotic approximations for the outage probability of a network node. Our analysis sheds more light on the interplay between the channel conditions, the network size and the adopted transmission scheme, and provides a useful tool for the design of cooperative networks.
Selection relaying is a promising technique for practical implementation of cooperative systems with multiple relays. However, to select the best relay, globe channel knowledge is required at the selecting entity. In this paper, we consider the relay selection problem in dual-hop amplify-and-forward (AF) communication systems with partial channel state information (CSI). We present relay selection...
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