The GSM System for Mobile Communications
The GSM System for Mobile Communications
ISPAN '00 Proceedings of the 2000 International Symposium on Parallel Architectures, Algorithms and Networks
Proceedings of the 5th ACM international symposium on Mobile ad hoc networking and computing
Dynamic spectrum utilization in ad hoc networks
Computer Networks: The International Journal of Computer and Telecommunications Networking - Special issue: Military communications systems and technologies
The capacity of wireless networks
IEEE Transactions on Information Theory
Spectrum pooling: an innovative strategy for the enhancement of spectrum efficiency
IEEE Communications Magazine
Modeling and analysis of opportunistic spectrum sharing with unreliable spectrum sensing
IEEE Transactions on Wireless Communications
Adaptive uplink MAC for CDMA-based cognitive radio networks
MILCOM'09 Proceedings of the 28th IEEE conference on Military communications
A cognitive mobile sensor network for environment observation
Telematics and Informatics
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The spectrum of deployed wireless cellular communication systems is found to be under-utilized, even though licensed spectrum is at a premium. To efficiently utilize the band-width left unused in a cellular system, which we denote as the primary system (PRI), we design a system with an ad hoc/mesh over-lay network, which we denote as the secondary system (SEC). The basic design principle is that the SEC operates in a non-intrusive manner and does not interact with the PRI. We develop a multi-channel MAC protocol, to enable the interoperation of the PRI-SEC system. We address a number of technical challenges pertinent to this networking environment, and evaluate the performance of MAC. Our performance evaluation results show that, in a single-hop ASN, the ASMAC transparently utilizes 75% of the bandwidth left unused by the PRI, while, in multi-hop ASNs, due to spatial reuse, the ASMAC can utilize significantly higher number of the idle PRI resources.