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Cooperative communication based on cooperative diversity allows a collection of radio terminals to relay signals for each other in wireless fading channels. In wireless ad hoc networks, nodes communicate with each other using multihop routed transmission and thus hop-by-hop cooperative diversity can be effectively exploited. This paper proposes two cooperation models of per-link cooperation (PLC)...
We study a wireless full-duplex amplify-and-forward relay link where a destination receives superposition of relayed and direct signals. We propose a new relay protocol that performs co-phasing of the two paths. We analyze the performance of the relay link by calculating closed-form expressions for the average end-to-end signal-to-noise ratio assuming flat Nakagami-m fading channels and by simulating...
This paper presents a cross-layer approach to jointly design adaptive modulation and coding (AMC) at the physical layer and cooperative truncated automatic repeat request (ARQ) protocol at the data link layer. We first derive an exact closed form expression for the spectral efficiency of the proposed joint AMC - cooperative ARQ scheme. Aiming at maximizing this system performance measure, we then...
We study signal-to-noise ratio (SNR) gains for two different cooperation strategies that are applied to networks consisting of one source, one destination, and one or two relays, respectively. The first strategy is called orthogonal decode-and-forward where all transmit terminals transmit interference free in orthogonal time slots. The second strategy is called nonorthogonal decode-and-forward where...
Performance of cooperative spatial multiplexing systems over composite channels is presented. In particular, we derive the closed-form average symbol error rate (SER) expression for cooperative spatial multiplexing systems with linear equalization receiver (e.g. Zero-Forcing) and M-ary modulation scheme in the composite channel of log-normal shadowing and Rayleigh fading. Using the Gauss-Hermite quadrature...
In this paper, we examine the spatial diversity of cooperative communications for image transmission without deploying multiple antennas at the transmitter. We propose a novel region of interest (ROI)-based scheme for image transmission over wireless cooperative/relay fading channels. By having the relay terminal assist the direct communications, we can increase the resilience for ROI against the...
Research on cooperative communication has revealed potential benefits from employing this technique in wireless networks. However, most of the work in this field pays little attention to the impact of correlation on the performance achieved. In this paper, the effect of fading correlation on the mutual information of a cooperative communication system with multiple relay nodes is investigated. A generalised...
We describe an experimental system that combines a wireless body area network (WBAN) with satellite communication links to enable remote medical treatment and healthcare services. One main advantage of WBAN is that it enables automatic biosignal collection in real time which is essential in medical treatment and healthcare vigilance. The WBAN is implemented using ultra-wideband technology. Multi-hop...
In this paper, a new combination of a multiple access scheme and spatial diversity offered by relays is proposed. In order to support several users in a system, interleave division multiple access (IDMA) is suggested here due to the capability to deal with asynchronous transmission by the users. The relays apply amplify-and-forward combined with delay-diversity in order to exploit the spatial diversity...
We consider wireless multihop systems with regenerative relaying, where the data transmission between two peers is realized with the help of a certain number of intermediate estimate-and-forward relays. In this regard, we specifically deal with the problem of allocating appropriate transmit power levels to the source node and the various relay stations subject to both individual power constraints...
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