نتایج جستجو برای: design spectrum
تعداد نتایج: 1170720 فیلتر نتایج به سال:
This paper gives a short introduction to the algebraic speci cation language Spectrum Using simple well known examples the objectives and concepts of Spectrum are explained The Spectrum language is based on axiomatic speci cation techniques and is oriented towards functional programs Spectrum includes the following features partial functions de nedness logic and xed point theory higher order el...
Consider a spectrum of N orthogonal channels licensed to a slotted primary network. Let Sn(t) ∈ {0 (busy), 1 (idle)} denote the occupancy of channel n in slot t. We assume that the spectrum occupancy S(t) ∆ = [S1(t), . . . , SN(t)] follows a discrete-time homogeneous Markov process with finite state space S ∆ = {0, 1} and known transition probabilities {Ps,s′}s,s′∈S, where Ps,s′ ∆ = Pr{S(t+ 1) ...
The genus Coronavirus contains about 25 species of coronaviruses (CoVs), which are important pathogens causing highly prevalent diseases and often severe or fatal in humans and animals. No licensed specific drugs are available to prevent their infection. Different host receptors for cellular entry, poorly conserved structural proteins (antigens), and the high mutation and recombination rates of...
The radiofrequency spectrum is a valuable national economic resource. Efficient use of this resource is important to national economic well-being. National administrations have traditionally relied on a centrally planned model to manage spectrum. This has involved planning the use for parts of the spectrum at a national level, consistent with international conventions, and then issuing device s...
This paper proposes an algorithm for spread spectrum watermark design under compressive sampling (CS) attack using hybridization of genetic algorithm (GA) and neural network. In watermarking application, CS may be viewed as a typical fading-like attack operation on the watermarked image. GA is used to determine the watermark strength taking into consideration of both robustness and imperceptibi...
In recent years, CDMA has been recognized as one of the most efficient and reliable schemes for cellular radio communications. The CDMA scheme was adopted as a new wireless communication industry standard, IS-95,1 by the Electronic Industries Association (EIA) and the Telecommunications Industry Association (TIA) in 1993 and possesses several distinct advantages:2 The spectral density is reduce...
The performance of a Turbo code depends on the interleaver design. There are two major criteria that can be considered in the design of an interleaver. Distance spectrum properties of the code and the correlation of the extrinsic information with the input data are the two major criteria in designing an interleaver. This paper describes a new interleaver design based on these two criteria. Simu...
In this paper we formulate a contract design problem where a primary license holder wishes to profit from its excess spectrum capacity by selling it to potential secondary users/buyers, but needs to determine how to optimally price it to maximize its profit, knowing that this excess capacity is stochastic in nature and cannot provide deterministic service guarantees to a buyer. We address this ...
We consider a dynamic spectrum sharing system consisting of a primary user, whose licensed spectrum is allowed to be accessed by a secondary user as long as it does not violate the prescribed interference limit inflicted on the primary user. Assuming the Nakagami-m block-fading environment, we aim at maximizing the performance of secondary user’s link in terms of average spectral efficiency (AS...
Recently, Cognitive Radio has been proposed as a promising technology to improve spectrum utilization. A highly flexible SDR( Software defined Radio) system needs to configure each of its blocks to give optimum performance over the available bandwidth. Present work discusses an approach for rate adaptive coder yielding minimum BER (Bit error rate) for emergency services over cognitive radio. Th...
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