a communication net is usually represented by a linear graph g whose branches represent channels for information flow and whose vertices represent sources, sinks and switching centers. the purpose of this paper is to show that for modeling digital communication nets, conventional use of the concepts of capacity and terminal capacity is inadequate . we will present an alternative to max-flow min...

A collision frequency shift keyed system (CFSK) using M-ary FSK signaling is investigated. CFSK is a wireless multiple access system in which users access a channel without cooperation. This results in collisions when users simultaneously transmit signals in the same frequency band. However, analysis has shown that the CFSK system has the potential to achieve greater capacities than binary mult...

Due to the short and bursty incoming messages, channel access activities in a wireless random access system are often fractional. The lack of frequent data support consequently makes it difficult for the receiver to estimate and track the time varying channel states with high precision. This paper investigates random multiple access communication over a compound wireless channel where channel r...

We consider the problem of arbitrating access to a tree stn~ctured communication channel with large geographic extent, providing multipoint communication among a set of terminals. In our model. terminals transmit information in bursts consisting of many packets and compete for the right to transmit bursts. In the simplest case, the channel allows only one terminal to transmit at a time; this ca...

In this paper a simple multiuser Multicarrier system is proposed for multiuser communication, user separation and detection using Interleave Division Multiple Access (IDMA). The performance of IDMA is analyzed in Gaussian and Qausi Static channels. In multicarrier Interleave Division Multiple Access (MC-IDMA) users are separated and identified by interleaving instead of codes as in Code Divisio...

background:patient concerns represent opportunities for improvement in orthopaedic care. thisstudy’s objectiveis to identify the nature and prevalence of unsolicited patient complaints regarding orthopaedic care ata tertiary referral hospital. the primary null hypothesis that there are no demographic factors associatedwith complaint types was tested. secondarily we determined if the overall com...

Mobility of users and information is an important feature of IT systems that must be considered during design of sensitive information protection mechanisms. This paper describes an architecture of MobInfoSec system for sharing documents with sensitive information using fine-grained access rules described by general access structures. However, the proper usage of general access structures requi...

CDMA (code division multiple access) provides higher capacity, flexibility, scalability, reliability and security than conventional FDMA (frequency division multiple access) and TDMA (time division multiple access). It has already been widely deployed in the second generation cellular communication systems and was proposed for the emerging and future wireless systems, including the third genera...