Brent Horine

Bio: Brent Horine is an academic researcher from Manhattan College. The author has contributed to research in topics: Surface acoustic wave & Resonator. The author has an hindex of 7, co-authored 20 publications receiving 138 citations. Previous affiliations of Brent Horine include University of Central Florida.

Link Rendezvous Protocol for Cognitive Radio Networks

Abstract: In an opportunistic dynamic spectrum access environment, individual nodes sense the local spectrum and choose their operating frequencies and bandwidth in collaboration with the other participating nodes. To make their spectrum access decisions, the nodes need to communicate with the existing nodes operating in the area. In this paper we propose an approach which establishes this first connection with a minimum risk of interference. We propose a link rendezvous strategy which relies on frequency domain decision statistics. Nodes wishing to join the network are emitting and scanning for a simple carrier with a small number of sidetones. We describe the strategy in the context of collaborative spectrum sensing. To validate our approach, we describe a series of experiments using the GNU Radio software defined radio toolkit. We show that an attention signal of length equivalent to a single FFT frame can be detected in a high noise environment using two sidetones.

Surface acoustic wave waveguide-coupled resonator notch filter

Abstract: A surface acoustic wave (SAW) waveguide-coupled resonator filter is overcoupled to produce an essentially constant conductance and susceptance over at least the bandwidth of a desired notch filter. The SAW resonator filter is embedded in a bridged-T allpass circuit to provide the pair of equal capacitances of the circuit, and the resonator ground is connected to one terminal of the parallel inductor of the circuit having the other terminal connected to a system ground.

Performance Analysis of Link Rendezvous Protocol for Cognitive Radio Networks

Abstract: A link rendezvous protocol is proposed in the context of first responder applications These applications require protocols that can withstand the total loss of infrastructure, evolve autonomously, and scale to meet the capacity demands of a crisis Our protocol does not rely on critical infrastructure It is designed to be spectrally efficient and it minimizes the risk of interference to ongoing communications We present an overall process which facilitates establishing and maintaining self-configuring networks based upon a service paradigm We then present the link rendezvous process in detail At the heart of this process is an attention signal composed of a carrier with carefully designed side tones The parameters and performance metrics associated with this attention signal and link rendezvous protocol are discussed The probabilities of false positives and negatives in the detection of this signal are analyzed numerically Time to connect factors are also analyzed

Practical implementation of coupling-of-modes theory for SAW device modeling

Abstract: Procedures are presented for integrating the COM (coupling-of-modes) results of C.S. Hartmann and B.P. Abbott (1988) into a form useful for modeling an entire SAW (surface acoustic wave) device. Conversion of the three-port P-matrix COM solutions into a standard two-port ABCD matrix form is shown. With the resultant ABCD matrix, graphical results are shown for the full SAW device model including second-order effects and matching circuitry. These results are presented for different types of SAW devices such as those with uniform, apodized, and withdrawal-weighted transducers and are compared with conventional approaches to SAW modeling. Experimental results for various device configurations and metal thicknesses are shown for comparison with predicted model results. In general there is close agreement between experiment and the implementation of COM theory reviewed. >

High frequency STW resonator filters

Abstract: The authors present results obtained in the 1-GHz-2-GHz region for surface transverse wave (STW) resonator filters implemented using inline coupled (RFI) and combined mode resonator filter (CMRF) techniques. The STW device performance is strongly dependent on the surface confinement of the acoustic wave. In an inline resonator filter the inner grating serves the dual purpose of trapping the energy near the surface and providing the proper coupling between the two ports, making the periodicity of the inner grating a more critical parameter than in a combined mode device. Results show the effect of changing the periodicity of the inner grating on the overall response of the RFIs. The performance of combined mode resonator filters at 1 and 2 GHz is reviewed. Phase noise measurements for the 1-GHz CMRF device are presented, and the effect of changing the metal thickness on the overall device performance is demonstrated. >

Rendezvous for Cognitive Radios

Abstract: Cognitive radios have been touted as a solution to communicating in a Dynamic Spectrum Access environment. This paper examines how cognitive radios initially find one another among the expanse of ever-changing open spectrum, termed the rendezvous problem. Specifically, it addresses the problem of rendezvous under varying levels of system capabilities, spectrum policies, and environmental conditions. The focus is on rendezvous when there are are no control channels or centralized controllers, which we term the blind rendezvous problem. Under these conditions, a sequence-based and modular clock blind rendezvous algorithms are proposed, and it is shown that the performance of these algorithms compares favorably to that of a random blind rendezvous algorithm. Specifically, the sequence-based algorithm provides a bounded Time To Rendezvous (TTR) and the ability to prioritize channels where rendezvous is more likely to occur; the modular clock algorithm reduces the expected TTR, requires little precoordination among radios attempting to rendezvous, and is robust to radios sensing different sets of available channels.

Surface-acoustic-wave filter

Abstract: A SAW filter comprising a piezoelectric substrate and at least two filter tracks formed on the substrate, each having at least two IDT electrodes for input and output. The two filter tracks have substantially the same phase within a pass band, while it is substantially inverse-phased outside the pass band. For realizing the above-described conditions, input IDT electrode of one filter track is connected in parallel with input IDT electrode of the other filter track, while output IDT electrode of one filter track is connected in parallel with output IDT electrode of the other filter track. Furthermore, frequency values of said two filter tracks substantially coincide at a point 3dB lower from the peak transfer function value. Thus the above-configured SAW filter of the present invention is smaller in the overall size and offers a broad pass band and a steep attenuation characteristic.

Principles Of Cognitive Radio

Abstract: Widely regarded as one of the most promising emerging technologies for driving the future development of wireless communications, cognitive radio has the potential to mitigate the problem of increasing radio spectrum scarcity through dynamic spectrum allocation. Drawing on fundamental elements of information theory, network theory, propagation, optimisation and signal processing, a team of leading experts present a systematic treatment of the core physical and networking principles of cognitive radio and explore key design considerations for the development of new cognitive radio systems. Containing all the underlying principles you need to develop practical applications in cognitive radio, this book is an essential reference for students, researchers and practitioners alike in the field of wireless communications and signal processing.

Sequence-Based Rendezvous for Dynamic Spectrum Access

Abstract: In the context of dynamic spectrum access (DSA), rendezvous refers to the ability of two or more radios to meet and establish a link on a common channel. In decentralized networks, this is often accomplished by each radio visiting potential channels in random fashion, in a process that we call blind random rendezvous. In this work, we propose the use of sequences that determine the order with which radios visit potentially available channels. Through sequence-based rendezvous, it is possible to: (i) establish an upper bound to the time to rendezvous (TTR); (ii) establish a priority order for channels in which rendezvous occurs; (Hi) reduce the expected TTR as compared to random rendezvous. We provide an example of a family of sequences and derive the expected time-to- rendezvous using this method. We also describe how the method can be adopted when one or more primary users are detected in the channels of interest.