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In general, cognitive radio system (CRS) can be viewed as a radio system using technology that allows it to obtain knowledge of its operational environment, established policies and its internal state; dynamically and autonomously adjust its operational parameters and protocols according to the obtained knowledge and predefined objectives; and to learn from the results obtained. Given such definition...
A Yagi-Uda antenna with a small short interelement distance (d) of approximately 0.025 lambda is proposed for use as a UHF-band ITS in-vehicle antenna. A distributed constant line is added to the center of the reflector dipole as a reactor. It is shown that a Gw of more than 4.7 dBi can be achieved in the 10-MHz bandwidth. The antenna can be placed near the body of a car without any significant deterioration...
In this paper we present preamble design for millimeter-wave single carrier wireless personal area networks. Several factors are considered for a successful preamble design, such as sequence complexity, operation range, associated delay, robustness to frequency offset. Complementary Golay sequences are selected, which combine flexibility and performance. Simulation results indicate at optimum threshold...
A cognitive radio system (CRS) senses the radio spectrum environment and adaptively use unoccupied spectrum resource. The CRS should optimize between two conflicting goals for different applications. One is the minimization of interference to primary users and the other is the maximization of usage of spectrum opportunities of the secondary users. In this paper, we propose a dual-level management...
In this paper, we propose a method to reduce the scan time using detection probability calculated from reports from multiple terminals. The detection probability is a probability that any of two APs (APi and APj) are found at the same time under the condition when APi is found. By using this method, terminals can omit to scan some of channels which are apparently lower in probability that available...
In this paper, we propose a new method for estimation of parameters of a nonlinear system by low-pass filtered M-sequence. We applied the proposed method to a nonlinear vibratory system which consists of a mass, a damper and linear and nonlinear spring. From the results of the experiment, it is shown that the proposed method is effective in representing nonlinear property of the system.
In this paper we propose an optical flow estimation method based on compensating method by using spatiotemporal differentiation. Technique using spatiotemporal differentiation is one of optical flow calculation method. This method enables us to calculate velocity distribution rapidly, but the error in the approximation of derivative coefficients increases as the displacement of the moving pattern...
In order to operate a robot, various devices are proposed such as a joystick, a master-slave arm, and keyboard. However, these devices have problems such as response speed. Instead of these devices, biosignal such as myoelectric signal is used as an interface between human and machine. The myoelectric signal represents the forces generated by muscle. In this paper, we propose to use the myoelectric...
IEEE P1900.4 is an emerging standard for optimized radio resource utilization where cognitive radio technologies are used for efficient spectrum utilization. In this paper, we design and implement a cognitive wireless network system based on open documents of IEEE P1900.4, and evaluate its performance using UDP streaming and HTTP download. Our experiments show interesting results that total network...
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