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Recently, a block spreading code division multiple access (BS-CDMA) technique was presented whereby user-specific preceding along with orthogonal spreading codes are used to achieve multi-user interference (MUI) free when all users arrive at the base station simultaneously. In practice however, imperfect synchronization destroys the orthogonality among users and MUI occurs. This paper investigates...
Clock synchronization is one of the key technologies in wireless ad hoc networks. As a decentralized network, we usually realize clock synchronization by using mutual synchronization methods. Despite of performance in clock synchronization, current mutual synchronization methods have some shortcomings, such as high complexity and overhead. In this paper, a clock synchronization approach using weight...
In this paper we consider a wide band multiuser impulse modulation based system combined with DS-CDMA. We focus on the synchronization problem and we derive an optimal maximum likelihood metric for multiuser synchronization assuming an unstationary Gaussian noise model. Then, with the appropriate simplifications we obtain a simple implementation that is capable of achieving near optimal performance...
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