Abstract—Recently developed cooperative diversity scheme enables a terminal to get transmit diversity through the support of other terminals. However, most of the introduced cooperative schemes have a common fault of decreased transmission rate because the destination should receive the decodable compositions of symbols from the source and the relay. In order to achieve high data rate, we propo...

Relay-assisted cooperative communication has received considerable attention as a promising approach to alleviate the burden of installing multiple antennas on simple terminals but still achieving transmit diversity. In most prior work, perfect error detection is assumed to prevent relays that receive in error from forwarding. Since error detection is often performed at the medium access contro...

In this paper we propose an energy efficient cooperative MIMO system. Space-time block codes (STBC) and code combining techniques are applied to utilize the inherent spatial diversity in wireless cooperative MIMO systems. We form a group of senders and receivers to provide higher order MIMO diversity and implement our STBC scheme in a distributed manner. In the receiving group, code combining i...

Title of dissertation: WIRELESS NETWORK COCAST: COOPERATIVE COMMUNICATIONS WITH SPACE-TIME NETWORK CODING Hung-Quoc Duc Lai, Doctor of Philosophy, 2011 Dissertation directed by: Professor K. J. Ray Liu Department of Electrical and Computer Engineering Traditional cooperative communications can greatly improve communication performance. However, transmissions from multiple relay nodes are challe...

Relational diversity can be characterized by heterogeneous distributions of tie strengths in social networks and this diversity is present not only among humans, but throughout the animal world. We account for this observation by analyzing two network datasets from Facebook. We measure the strength of a tie by calculating the extent of overlap of friends between the two individuals. Based on th...

We present a study on the end-to-end performance of a cooperative diversity system over random fading channels at high signal-to-noise ratio (SNR). The performance criteria we consider are the average symbol error probability (SEP) and outage probability. At high SNR, both average SEP and outage probability can be characterized by two parameters: the diversity and coding gains. We provide analy...

Future wireless network may consist of a cluster of low-complexity battery-powered nodes or mobile stations (MS). Information is propagated from one location in the network to another by cooperation and relaying. Due to the channel fading or node failure, one or more relaying links could become unreliable during multiple-hop relaying. Inspired by conventional multiple-input multiple-output (MIM...

Cooperative communication can achieve spatial diversity gains, and consequently combats signal fading due to multipath propagation in wireless networks powerfully. A novel complex field network-coded cooperation (CFNCC) scheme based on multi-user detection for the multiple unicast transmission is proposed. Theoretic analysis and simulation results demonstrate that, compared with the conventiona...

Cooperative relaying and dynamic-spectrum-access/cognitive techniques are promising solutions to increase the capacity and reliability of wireless links by exploiting the spatial and frequency diversity of the wireless channel. Yet, the combined use of cooperative relaying and dynamic spectrum access in multi-hop networks with decentralized control is far from being well understood. We study th...

In this paper, a multi–source multi–relay cooperative wireless network with binary network coding is studied. The system model encompasses: i) a demodulate–and–forward protocol at the relays, where the received packets are forwarded regardless of their reliability; and ii) a maximum–likelihood optimum decoder at the destination, which accounts for possible decoding errors at the relays. An asym...