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This paper investigates an optimal decentralized Space-Time Block Coding (STBC) transmission strategy given an overhead constraint. The design of protocols for a cooperative network is formulated as an optimization problem. By solving the proposed problem, M-group decentralized STBC is proved to be the optimal strategy when neither central control nor inter-relay communications is permitted. The optimality...
Failure is a kind of important resource. Establishing the failure knowledge database, carrying out failure experience and knowledge management are important contents of failure science research. Project failure is a common failure. At present, there are also some researches about project failure knowledge management, but project failure knowledge expression problem has not been well solved. This paper...
Cooperative communications is a multiuser framework for wireless network environments. The collaboration among the users can exploit the inherent spatial diversity gains to thereby enhance the system performance significantly. Due to the mobility of users, especially in cellular systems, the exact locations of them are usually unknown a priori and hard/costly to discover. Therefore it is reasonable...
This paper addresses the problem of symbol synchronization for the uplink of Orthogonal Frequency Division Multiple Access (OFDMA) Systems over multi-path channels. An efficient two-step algorithm is proposed based on the redundancy introduced by the cyclic prefix (CP). The first step separates the signals corresponding to each user using the property of circular convolution. The second step individually...
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