The Quantize & Forward (QF) scheme for two-way relaying is studied with a focus on its rate-distortion properties. A sum rate maximization problem is formulated and the associated quantizer optimization problem is investigated. An algorithm to approximately solve the problem is proposed. Under certain cases scalar quantizers maximize the sum rate. I. INTRODUCTION Consider a communication system...

We consider the application of wireless network coding to a “butterfly” wireless network, comprising two sources and two destinations sharing a single relay. We obtain upper bounds on the end to end capacity of the network in terms of the codebook cardinalities, allowing the use of an extended rather than a minimal hierarchical mapping at the relay and assuming that partial complementary side i...

This paper investigates the Diversity Multiplexing Tradeoff (DMT) of the generalized quantizeand-forward (GQF) relaying scheme over the slow fading half-duplex multiple-access relay channel (HD-MARC). The compress-and-forward (CF) scheme has been shown to achieve the optimal DMT when the channel state information (CSI) of the relay-destination link is available at the relay. However, having the...

Enabling cooperation among nodes of a wireless network can significantly reduce the required transmit power as well as the induced intra-network interference. Due to the practical half-duplexity constraint of the cooperating nodes, they are prohibited to simultaneously transmit and receive data at the same time-frequency resource. The purpose of this dissertation is to illustrate the value of c...

This paper presents an outage performance of multiple access relay channel (MARC) for decode-and-forward (DF) relay and amplify-and-forward (AF) relay selection. We consider the multiple-access relay channel with two source nodes, one relay node and one destination node. In MARC, multiple sources transmit to a common destination simultaneously with the assistance of a single relay. In a relayin...

Manuscript Received 8-August-2012 and revised 5-October-2012 ISSN: 2322-3936 Accepted on 1November-2012 Abstract— This paper concerns two-hop communication over relayassisted Block fading channel. It is assumed there is not a direct link between the transmitter and the affiliated destination and the communication occurs in two hops through the use of a relay, where the amplify and forward (AF) ...

Cooperative diversity is a transmission technique where multiple users pool their resources to form a virtual antenna array that realizes spatial diversity gain in a distributed fashion. In this paper, we examine space-time signal design for a simple amplify-and-forward relay channel. We show that the code design criteria for the relay case consist of the traditional rank and determinant criter...

This paper examines the information theoretic metric of outage probability for a decode-and-forward (DF) based asymmetric two-way relay transmission (i.e. the two source terminals have different target rates). We first characterize the achievable rate region of a conventional three-node network. After that the conventional three-node scenario is analyzed in terms of outage probability and the c...

In this paper, we study a diamond-relay channel where the source is connected to M relays through orthogonal links and the relays transmit to the destination over a wireless multiple-access channel in the presence of an eavesdropper. The eavesdropper not only observes the relay transmissions through another multiple-access channel, but also observes a certain number of source-relay links. The l...

We consider a state-dependent full-duplex relay channel with the channel states available non-causally at only the source, i.e., neither at the relay nor at the destination. For the discrete memoryless (DM) case, we establish lower and upper bounds on the channel capacity. The lower bound is obtained by a coding scheme at the source that uses a Gel’fand-Pinsker like binning scheme at the source...