Browsing by Author "Evans, J"

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    Energy–Efficiency Fairness of Interference Multi-Relay Networks for Multi-User Communications
    (IEEE, 2021-03) Ding, M; Atapattu, S; Weeraddana, C; Evans, J
    We investigate a single-antenna multi-user multi-relay interference network, where multiple source nodes simultaneously communicate with their respective destination nodes via half-duplex decode-and-forward relays. To ensure fairness among users, we consider a power allocation strategy to maximize the worst-case energy efficiency (EE) of all users for a fixed relay assignment. The resulting optimization problem turns out to be non-convex. Different from those in the literature, our method here is an iterative algorithm where two geometric programs (GPs) are solved in each iteration, one producing an upper-bound to the solution of the original problem and the other providing a feasible lower-bound. Moreover, the upper-bound GP approaches the original problem asymptotically. Our algorithm also works for the problem arising in the non-interfering (orthogonal) transmission, which was previously solved as a fractional program. Numerical results reveal that non-orthogonal transmission outperforms orthogonal transmission in terms of the worst-case EE at low and medium signal-to-noise ratios.
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    Identification of stock market maniplulation: a case study
    (Business Perspectives, Publishing Company, 2008-05-05) Alles, L. A; Simpson, J; Evans, J; Westaway, J
    This paper is based on an actual expert witness report undertaken by university business academics for a corporate regulatory authority in a developed country. The paper describes the methodology used to identify cases of stock market manipulation by insiders of a no liability mining company. An actual data set has been analyzed but the company and the country remain anonymous. It should be added that the real parties originally under suspicion were in fact charged with stock market manipulation based on the actual expert witness report outlined in this paper.