Network information theory is the study of communication problems involving multiple senders, multiple receivers and intermediate relay stations. The purpose of this thesis is to extend the main ideas of classical network information theory to the study of classical-quantum channels. We prove coding theorems for the following communication problems: quantum multiple access channels, quantum int...

In this paper we consider decoherence-free communication over multiple access and k-user quantum channels. First, we concentrate on a hermitian unitary noise model U for a two-access bi-unitary channel and show that in this case a decoherence-free code exists if the space of Schmidt matrices of an eigensubspace of U exhibits certain properties of decomposability. Then, we show that our techniqu...

We present a solution to an old problem in distributed computing. In its simplest form, a sender has to broadcast some information to two receivers, but they have access only to pairwise communication channels. Unlike quantum key distribution, here the goal is not secrecy but agreement, and the adversary (one of the receivers or the sender himself) is not outside but inside the game. Using only...

Limited communication resources have gradually become a critical factor toward efficiency of decentralized large scale multi-agent coordination when both system scales up and tasks become more complex. In current researches, due to the agent's limited communication and observational capability, an agent in a decentralized setting can only choose a part of channels to access, but cannot perceive...

the main purpose of this study was to investigate effect of access to health facilities on the health status of rural households at kermanshah province. statistical pupation of this study consisted of all heads of rural households at bisotoun district in harsin township, kermanshah province, iran (n=1020), that 278 of them were selected by the cluster random sampling method. the main instrument...

Cognitive radio ad hoc networks (CRAHNs) consist of autonomous nodes that operate in ad hoc mode and aim at efficient utilization of spectrum resources. Usually, the cognitive nodes in a CRAHN exploit a number of available channels, but these channels are not necessarily common to all nodes. Such a network environment poses the problem of establishing a common control channel (CCC) as there mig...

due to the importance of technological development in agriculture, it is necessary to increase intention of technology using and so its adoption among farmers. the aim of this study was investigating influence factorson farmers' intention in using modern channels. research population was all farmers covered of feyzabad networks water supply in fars province (192 farmers). samples of 127 fa...

A key challenge to the vision of ubiquitous mobile multimedia access is the communication resource limitation in multiple access wireless channels. In this paper we review several source adaptation techniques and wireless collaboration schemes. We then formulate the multi-user video communication problem as a network utility maximization (NUM) problem., and solve it using a pricing scheme. The ...