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We present a GPS-enabled channel sounding platform for measuring both vehicle-to-vehicle and vehicle-toroadside wireless channels. This platform was used to conduct an extensive field measurement campaign involving vehicular wireless channels across a wide variety of speeds and line-of-sight conditions. From the data, we present statistical(More)
Dynamic spectrum access to the unused licensed spectrum has been proposed as a solution to the spectrum scarcity problem. However, efficient spectrum sensing techniques are crucial on the way towards systems, which use idle spectrum bands opportunistically and increase the overall spectral efficiency. The spectrum occupancy measurement is very important for(More)
This paper studies collaborative strategy for route and spectrum selection in decentralized wireless cognitive radio network. We explore the problem from two aspects: the spectrum stability and the path stability, which we use stochastic processes and probability theory to analyze. Furthermore, we also design a method that measures the interference to(More)
In cognitive radio networks (CRNs), considering the randomness of primary users’ (PUs) arrival and the nonideality of spectrum sensing performed by secondary users (SUs), the collisions between PUs and SUs are unavoidable. Frequent occurrences of collisions will strongly degrade PUs’ and SUs’ QoS. Therefore, collision statistics, such as the average number(More)
In this paper, the time synchronization algorithm for orthogonal frequency division multiplexing (OFDM) system is analyzed. Based on the algorithm using PN sequence, different methods of setting adaptive detection threshold have been proposed before. We analyze the performance of the methods theoretically, and propose a method which is suitable for large(More)