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With mobile WiMAX being widely deployed, providing a feasible solution for location service in mobile WiMAX is imperative and significant. In this paper, we propose a novel mobile WiMAX positioning scheme, which includes four steps: downlink preamble fast detection (DPFD), positioning algorithm selection mechanism based on the number of detected preambles, media access control (MAC) message signaling,...
This driven by the need to promote a more efficient use of radio resources and improve the operators' profits, resource allocation has turned into a joint technical and economical problem. At the same time, as a possible enabling solution, game theory has been applied to either dynamic spectrum access (DSA) or joint radio resource management (JRRM) in wireless communication research recently. In this...
B3G wireless networks are expected to be characterized by the pouring of different radio access technologies (RAT) and diversified service requirements. In parallel with this, the irreconcilable conflicts between the great demand for radio spectrum and its scarcity bring the issues of dynamic spectrum management (DSM) and efficiency in spectrum utilization into our sight. This article aims to investigate...
Synchronization is a challenging task in ultra wideband (UWB) communications, and becomes more difficult in UWB based wireless sensor networks (WSNs) in the presence of multi-user interference (MUI). For such a system, we develop a synchronization scheme including a novel design of transmitted reference (TR) signal model to avoid MUI and an energy-efficient synchronization algorithm. The synchronization...
In this paper, a multipath delay estimation scheme for a MIMO-OFDM system is presented. The scheme is achieved by using the same training symbols for each transmitter antenna after performing transmission delay timing estimation. The training sequences which are simultaneously transmitted are specialized for utilizing the peak autocorrelation property. Probability statistics for multipath delay of...
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