Joe Bater

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— With the advent of cognitive radio technology, new paradigms for spectrum access can achieve near-optimal spectrum utilisation by letting each user sense and utilise available spectrum opportunistically while regulating the interference it imposes on other users through interference constraints. However , the simplest and most common forms of such(More)
The assignment of frequencies to radio transmitters in a mobile telecommunications network in such a way as to provide total coverage for a designated area is a problem of enormous interest to the telecommunications industry. This Frequency Assignment Problem has traditionally been modelled with binary constraints making it analogous to generalised graph(More)
With the advent of cognitive radio technology, new paradigms for spectrum access can achieve near-optimal spectrum utilisation by letting each user sense and utilise available spectrum opportunistically while regulating the interference it imposes on other users through interference constraints. However, the most common forms of binary and(More)
The frequency assignment problem is an important practical problem in telecommunications which is often modelled as a binary constraint satisfaction problem. We give a number of examples to show that important features of the problem cannot in fact be expressed using binary constraints between pairs of transmitters. Hence we argue that this problem should(More)
We propose a new spectrum-access etiquette for cognitive radios in a spectrum commons. When congestion might block a new device from initiating a call, the surrounding devices coordinate their actions and locally reassign their spectrum to create a gap for the new entrant. The etiquette is designed for devices operating dissimilar services with different(More)
—Cognitive Radio promises better spectrum utilisa-tion through decentralised control, sensing and decision making. The devices are intended to be inexpensive, upgradeable and adaptable. However, introducing upgraded devices into a decentralised environment may cause unexpected results, the upgrades may require a critical mass to show any benefit, and may(More)
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