Primary user activity is a major bottleneck for existing routing protocols in cognitive radio networks. Typical routing protocols avoid areas that are highly congested with primary users, leaving only a small fragment of available links for secondary route construction. In addition, wireless links are prone to channel impairments such as multipath fading; which renders the quality of the availa...

This study is based on using the optimization problem of linear cooperative spectrum sensing (CSS) techniques for analysis and correlation allocation to secondary users (SUs) without interfering with operations primary users.

The emergence and widespread adoption of the World Wide Web offers a great deal of potential in supporting cross-platform cooperative work within widely-dispersed working groups. The Basic Support for Cooperative Work (BSCW) project at GMD is attempting to realise this potential through development of Web-based tools which provide cross-platform collaboration services to groups using existing W...

A suboptimal joint bandwidth and power allocation for cooperative relay networks: A cooperative game theoretic approach Fair and efficient spectrum splitting for unlicensed secondary users in cooperative cognitive radio networks A self-adaptive regression-based multivariate data compression scheme with error bound in wireless sensor networks A midterm DBA algorithm for quality of service on agg...

Cooperative ubiquitous environments support user interaction and cooperative work by adapting to the prevalent situation of the present users. They are typically complex and have many environment components—interconnected devices and software modules—that realise new interaction techniques and facilitate collaboration. Despite this complexity, users need to be able to easily adapt their environ...

In cooperative transmission users are allowed to share antennas to transmit their messages to a common destination. Users employ either amplify-and-forward or decodeand-forward strategies to forward each others’ messages. In network-coding-based cooperative transmission schemes, users are allowed to combine their own and their partner’s message by a network-coding operation. This work analysis ...

We present a distributed scheme for trust inference in peer-to-peer networks. Our work is in context of the NICE system, which is a platform for implementing cooperative applications over the Internet. We describe a technique for efficiently storing user reputation information in a completely decentralized manner, and show how this information can be used to efficiently identify non-cooperative...

In future wireless networks, end-user nodes may cooperate to form logical links. By cooperation, even singleantenna nodes provide user cooperative diversity resulting in a performance gain comparable to multi-antenna systems. This gain is efficiently provided by cooperative coding schemes where users cooperate by mutually transmitting their code words. However, cooperation employs additional ch...

Cooperative trajectory mapping is an emerging technique that allows users to collaboratively map a person’s movements without using GPS measurements in indoor scenarios. This is accomplished by letting users periodically transmit limited amount of information, collected from their mobile phones, to a central server for processing. Cooperative mapping solutions have been proposed for application...

This paper proposes a user cooperation stimulating strategy among rational users. The strategy is based on cooperative game theory and enacted in the context of cooperative relay networks. Using the pricing-based mechanism, the system is modeled initially with two nodes and a Base Station (BS). Within this framework, each node is treated as a rational decision maker. To this end, each node can ...