In this paper, we present a unied performance analysis for cognitive cooperative communication systems. In particular, the system performance in terms of outage probability (OP) for three cooperative protocols, i.e. xed decodeand-forward (DF) relaying (FR), selective DF relaying (SR), incremental DF relaying (IR), under interference constraints, is derived over dissimilar Rayleigh fading channels corrupted by additive white Gaussian noise. The closed-form, integral-free, OP readily enables us to evaluate the cognitive cooperative system performance, which indicates the signicance of using relay in cognitive environment. To verify the analytical results, we provide some selected Monte Carlo simulations and the performance comparison of these protocols at the end.Index Terms-decode-and-forward, Rayleigh fading, outage probability, xed relaying, selection relaying, incremental relaying.
Currently, there are many methods for constructing cryptosystems based on various algebraic structures. This paper presents a proposed cryptosystem that based on a new algebraic structure with simple and flexible properties. This cryptosystem is constructed from Cyclic Geometric Progressions over polynomial ring in finite field, in which it is considered as a polyalphabetic cipher. Simple scheme for cryptosystem using the cyclic geometric progression over polynomial ring is described. The new structure of multiplicative group and Cyclic over polynomial ring is also mentioned in this paper.
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