[PDF] Top 20 Performance analyses and design for cognitive radios

... The spectrum underlay is also referred to as the concurrent spectrum access (CSA) [34]. As illustrated by Fig. 1.5, in CSA, the secondary user coexists with the active primary user, and is permitted to transmit ... See full document

... This paper provided the theoretical framework for the analysis and design of filter bank-based detectors for spectrum sensing applications in cognitive radios. The optimal detectors for uniform DFT ... See full document

... Up to this point in the thesis, we concentrate on single antenna CR devices. Multiple antennas on communicating terminals are well known to ensure high date rates and reliability. In the case of CR networks, they can ... See full document

... For cognitive ra- dio applications in particular, it can enable flexible and agile spectrum allocation, yet suffers from spectral leakage in the form of large side lobes, leading to inter-channel interference ... See full document

... Spectrum occupancy models are very useful in cognitive radio designs. They can be used to in- crease spectrum sensing accuracy for more reliable operation, to remove spectrum sensing for higher resource usage ... See full document

... efficient design of the link maintenance However, the interference model, spectrum assignment and access strategy are not considered in their ...in cognitive radio network in which data transmitted from ... See full document

... The FPGA logic was designed with VHDL. Two Altera Intellectual Property (IP) cores were used as part of the design: the 128-point FFT and a pipelined divider for calculating the hole ranking. The datapath ... See full document

... The essential problem of Spectrum Sensing Cognitive Radio is in designing high quality spectrum sensing devices and algorithms for exchanging spectrum sensing data between nodes. A simple energy detector cannot ... See full document

... Reconfigurable antennas have gained a lot of focus in recent years. These antennas are able to modify themselves with respect to the characteristics, such as operating frequency, radiation pattern, polarization, and ... See full document

... software radios are growing as stands for multiband multimode weirdo communications ...that cognitive radios are promising solutions to the problem of overcrowded ...of cognitive ... See full document

... The wideband sensing problem for OFDM-based CRs was considered in [9], where the detection thresholds for a bank of energy detectors were optimized jointly to maximize throughput performance. To improve the ... See full document

... The traditional on-the-job (OTJ) training, of new HTS operators usually consists of several weeks spent assisting a lead biochemist to become familiar with the methods and automation being used (Hamilton, 2002). This ... See full document

... Cognitive scenario typically categorises users in two categories being Primary users(PU) and secondary users(SU). The transmission criteria being that the most prior primary user is offered the highest preference ... See full document

... Matched filter detection [5] is generally used to detect a signal by comparing a known signal (i.e. a template) with the input signal. A matched filter will maximize the received SNR for the received signal. Therefore, ... See full document

... the cognitive radio ...for cognitive radios is a promising framework and that the lack of complete information in the decision process only slightly reduces system ... See full document

... In this paper, we assume time synchronization to the first arriving UL user signal as well as availability of information on the basic OFDMA system parameters such as FFT size, sampling time, and cyclic prefix (CP) ... See full document

... instance, radios maybe programmed to always attempt to rendezvous in the lowest number control channel that is currently not occupied by an ...two radios may not correctly sense the presence of a PU in a ... See full document

... practical performance limitations, energy detection has gained popularity during the last years as a spectrum sensing technique for dynamic spectrum access in cognitive radio ... See full document

... The second case study targets at demonstrating the benefits in a social network overlaying a CRN when the former provides feedback for the cross-layer protocol design of the latter. We assume that the traffic over ... See full document

... reference signals to the master USRP. A frequency refer- ence is provided by a 10-MHz signal and sample time is synchronized by a one pulse per second (1 PPS) signal. In our experimental setup, the PU was emulated using ... See full document