The problem of soft information optimization for memoryless relay networks is motivated and studied through AF relay networks, and in particular the AF relay multiple access (MAC) and broadcast (BC) channels. Relay optimization, capacity region characterization and optimal scheduling are addressed.

Cooperative communications is a new wireless communication technique which allows single antenna mobiles to share their antennas and to produce virtual multiple antenna system. We investigate the impact of relay location on the SER and system capacity for multi relay (amplify and forward) cooperative network in terms of distance and obtained the best relay location analytically. The impact of r...

The Multiple-access Relay Channel (MARC) has been considered as a promising technique in next generation wireless communication networks. In this work, we study a Network Coding based Multiaccess Relay Channel (NC-MARC) where a decode-and-forward relaying and a static XOR network coding are considered for the one-way relaying system. The system consists of two transmitters communicating with a ...

We consider relay channels in which the source-destination and relay-destination signals are assumed to be orthogonal and thus have to be recombined at the destination. Assuming memoryless signals at the destination and relay, we propose a low-complexity quantize-and-forward (QF) relaying scheme, which exploits the knowledge of the SNRs of the source-relay and relay-destination channels. Both i...

We consider the uncoded transmission over the halfduplex single relay channel, with a single antenna at the source, relay and destination nodes, in a Rayleigh fading environment. The phase during which the relay is in reception mode is referred to as Phase 1 and the phase during which the relay is in transmission mode is referred to as Phase 2. The following two cases are considered: the Non-Or...

An optimization procedure for the location of the relay transceiver in ultrawideband wireless communication system is presented. The impulse responses of different transceiver locations are computed by shooting and bouncing ray/image (SBR/Image) techniques and inverse fast Fourier transform (IFFT). By using the impulse responses of these multi-path channels, the bit error rate (BER) performance...

Relay Selection and Resource Allocation in One-Way and Two-Way Cognitive Relay Networks Ahmad Mustafa Alsharoa In this work, the problem of relay selection and resource power allocation in oneway and two-way cognitive relay networks using half duplex channels with di↵erent relaying protocols is investigated. Optimization problems for both single and multiple relay selection that maximize the su...

In this article, we develop an analytical framework for the performance analysis of cooperative amplify-and-forward (CAF) relay-based energy detection. We derive mathematical expression for the detection probability for single cognitive relay system and later extend it to multi-relay system. Our resulting expression is based on the canonical series representation of generalized Marcum Q-functio...