Dynamic spectrum auction is an effective solution to manage spectrum across many small networks. As the number of participants grows, collusion poses a serious threat to auction performance. Small groups of colluding bidders can make use of the interference constraints to manipulate auction outcomes, leading to unfair spectrum distribution and significant loss in auction revenue. Prior designs,...

Mobile telephone systems divide the coverage area among low transmitting power sectors. This allows the so-called frequency reuse between sectors: geographically “distant” sectors might employ the same electromagnetic frequencies, since the probability of interference between them is small. The electromagnetic frequencies available for mobile communications are very limited and their use is reg...

Cognitive radio is a new concept of reusing licensed spectrum in an unlicensed manner. The motivation for cognitive radio is various measurements of spectrum utilization, that generally show unused resources in frequency, time and space. These ”spectrum holes” could be exploited by cognitive radios. Some studies suggest that the spectrum is extremely underutilized, and that these spectrum holes...

The tremendous growth of wireless networks requires an efficient use of the scarce radio spectrum allocated to wireless communications. However, the main difficulty against an efficient use of radio spectrum is given by interferences, caused by unconstrained simultaneous transmissions, which result in damaged communications that need to be retransmitted leading to a higher cost of the service. ...

As frequency is a scarce resource, so efforts are being made to use the allotted frequency spectrum as competently as possible. The concept of Frequency Reuse efficiently serves this purpose by reusing the frequencies and channels in a communication system to improve its capacity and spectral efficiency. Cognitive Radio is one of the emerging technologies that apply frequency reuse method as it...

My dissertation examines algorithms for optimal spatial reuse TDMA scheduling with reconfigurable directional antennas. I present and solve the joint beam steering and scheduling problem for spatial reuse TDMA and describe a prototype implemented system based on the algorithms developed. The current prototype achieves up to a 600% speedup over TDMA with a mean of 234% in the experiments to date...

In this paper, using the EDGE system as an example, we apply a Kalman-filter power control method based on interference tracking and prediction to packet voice service in wireless networks. Our results reveal that power control significantly improves the spectral efficiency by enabling 1/3 frequency reuse while maintaining a stringent requirement of 2% packet loss probability for voice service....

Long Term Evolution (LTE) is broadly available to the world. The upcoming trend in LTE-Advanced (LTE-A) emphasizes the enhancement in spectrum efficiency, capacity and cell-edge user throughput and thus highlights the small cell technologies. With the advantage of small size, Femtocell is able to be deployed at "Died zone" and thus satisfying the service expectation particularly to cell-edge us...

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General packet radio service (GPRS) is designed for transmitting packet data and supposed to take its radio resource from the pool of channels unused by GSM voice services. Obviously, the introduction of GPRS affects on the voice services. In this paper the outage probability of non-frequency hopping and frequency hopping systems with different frequency reuse factor has been calculated in ord...