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Relay communication network is a technique to obtain spatial diversity by using one or more relay terminals in order to improve the transmission performance. Amplifty-and-forward (AF) and decode-and-forward (DF) are two kinds of fixed relaying protocols and widely researched now. In this paper the performance of AF and DF in terms of the outage probability and the symbol error rate (SER) is analysed...
IEEE 802.11n/ac wireless local area network (WLAN) supports frame aggregation, called aggregate medium access control (MAC) protocol data unit (A-MPDU), to enhance MAC efficiency by reducing protocol overhead. However, the current channel estimation process conducted only once during the preamble reception is known to be insufficient to ensure robust delivery of long A-MPDU frames in mobile environments...
This paper provides an enlightment into the pairwise error probability (PEP) of multi-antenna (MIMO) space-time code (STC) based selective decode then forward cooperative scheme considering Nakagami-m channel. We examine the pairwise error probability at the destination node, and we have formulated the closed form expression for pairwise error probability. We have achieved full diversity order in...
In this paper, we consider two-hop multi-input multi-output (MIMO) relay wireless systems with energy harvesting. In each hop, transmit antenna selection (TAS)/receive antenna selection (RAS), TAS/maximum ratio combining (MRC), or maximum ratio transmission (MRT)/RAS is employed. Also, a relay harvests energy from the source via either a time switching-based relaying protocol (TSR) or a power splittingbased...
This paper analyzes the end-to-end performance of a selective Decode-and-Forward (DF) based MIMO-OSTBC cooperative wireless system over time-varying Rayleigh fading links. Closed form expressions are derived for the per-frame average pair-wise error probability (PEP) and SNR outage probability considering a realistic scenario where all the communicating nodes including the relay are in motion along...
In this paper, we present a throughput optimized cross-layer design for multiple-input multiple-output (MIMO) wireless systems. The proposed design efficiently combines power control (PC), adaptive modulation and coding (AMC) and MIMO technology at the physical layer, with an automatic repeat request (ARQ) protocol at the data-link layer. Both basic ARQ and type-I hybrid ARQ are considered. More specifically,...
In this paper we investigate the performance of a densely populated relay network as a massive distributed system. The distributed relaying nodes construct a large set of antennas providing the system with the advantages of both the relays and the massive MIMO systems. We apply large scale analysis to evaluate the performance of the dense relay network as a massive system, and show that the signal-to-noise...
A simple distributed user scheduling (DUS) scheme is proposed for the MIMO multi-way relay channel (MWRC), where K (K ≥ 2) M-antenna (M ≥ 2) users are selected from K clusters of users to conduct all-cast information exchange via an M-antenna amplify-and-forward (AF) relay. In particular, the proposed DUS is based on the individual performance metric calculated by each user with its local channel...
This paper proposes a distributed relay selection and successive relaying scheme for Wireless Sensor Networks (WSN) with directional antennas. Since the working life of WSN is usually affected by the battery life of its nodes, the reduction of the nodes' working time without the sacrifice of communication quality is of significant interest. The proposed scheme makes explore the potential of the large...
DF-AF selection MIMO relaying, where the relay equipped with multiple antennas can adaptively switch between decode-and-forward (DF) protocol and amplify-and-forward (AF) protocol according to its decoding state of the source message, is investigated in cooperative networks. We consider orthogonal space-time block coded transmission for a DF-AF selection MIMO relaying system in Rayleigh fading environment,...
In this paper, we propose a novel slotted hybrid cooperative protocol named the sequential slotted amplify-decode-and-forward (SADF) protocol and evaluate its performance in terms of diversity-multiplexing trade-off (DMT). The relays between the source and destination are divided into two different groups and each relay either amplifies or decodes the received signal. We first compute the optimal...
In this paper we propose an efficient transmission strategy for the two-way relay channel (TWRC) with multiple relays, when these are multiple-input multiple-output (MIMO) transceivers that apply the amplify-and-forward (AF) protocol. Although the optimal beamforming strategy is known, it requires a central node, with channel state information (CSI) of the entire network, to compute all the beamforming...
We consider an end-to-end antenna selection (E2E-AS) scheme for a multiple-input multiple-output (MIMO) two-way relaying system with amplify-and-forward (AF) based relay terminal between two source terminals, each having multiple antennas. The proposed E2E-AS strategy involves selecting a single best antenna at each terminal of the system. Under a Rayleigh flat-fading environment, we present exact...
Recent information theoretic results suggest that precoding on the multi-user downlink MIMO channel with delayed channel state information at the transmitter (CSIT) could lead to data rates much beyond the ones obtained without any CSIT, even in extreme situations when the delayed channel feedback is made totally obsolete by a feedback delay exceeding the channel coherence time. This surprising result...
Cooperative relay communication techniques, which form the virtual MIMO systems through cooperation among different nodes, have been attracted more attentions. This paper provides an overview of state-of-the-art capacity for cooperative relay networks. Firstly, it introduces backgrounds, basic model and working mode of cooperative relay networks. Then, the capacity of amplify-and-forward (AF) dual-hop...
This paper investigates the achievable rate region of two-way amplify-and-forward (AF) relaying systems with multiple relays, where all nodes are equipped with multiple antennas. First, we find linear processing filters to optimize the weighted sum-rate for the two-way channels with sum power constraints. The proposed algorithm achieves the maximum weighted sum-rate by deriving the gradient expressions...
We investigate the outage performance of a user scheduling with antenna selection (USAS) scheme for a cellular multiuser two-way relay system over a Rayleigh flat-fading environment. Here, a multi- antenna base station communicates with several mobile users via an amplify-and-forward (AF) relay. The USAS strategy opportunistically selects the best user among multiple users and the best antenna at...
Cooperative relay techniques are exploited to reduce the transmission energy consumption which is very important for average and long range transmission in wireless sensor networks (WSNs). In this paper, the system having a two-antenna source, two one-antenna relays and a one-antenna destination is considered. Using distributed space-time code at relays, MIMO simple cooperative relay model (MSCR)...
We propose a cooperative orthogonal space-time block codes (OSTBC) transmission scheme in the adaptive-gain amplify-and-forward MIMO relaying with NS source antennas, NR relay antennas, and ND destination antennas, and analyze the asymptotic performance of the proposed scheme. Specifically, we explore the instantaneous channel state information (CSI) of source-to-relay channel and design an OSTBC...
This paper deals with the superposition coding (SPC) scheme in multiple-input multiple-output two-way relay channels subject to imperfect channel estimation. We determine the achievable rate region and the related channel estimation error degradation and we show how the available power is split between the two bi-directional data flows in order to maximize the system performance and to support fairness...
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