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Today, the telecom planning prediction based on quantitative analysis is becoming more necessary. It need consider many influential factors, such as the consumption of products, the quality of services, the quantity of customers, the performance of equipment, incomes, investment and so on. To verify and analyze the effectiveness of Neural Network for telecom planning prediction, the model of planning...
This paper presents a novel approach of designing broadband quasi-Yagi dipole antenna using Substrate Integrated Waveguide (SIW) techniques. The antenna configuration involves a newly proposed broadband microstrip-to-broadside parallel stripline transition and a two element printed quasi-Yagi array. As an antenna feeding network, the proposed transition is constructed on the basis of the SIW scheme...
This paper introduces the research of cognitive engine and application of artificial intelligence techniques in cognitive radio. The limitation of CR engine based on GA is analyzed, propose for improvement is proposed. The decision maker of CR engine should consider both the changeable factors and the unchangeable factors such as cost, bandwidth, signal rate and ARQ. Based on Neural Network, the method...
Wireless sensor network (WSN) applications sense events in-situ and compute results in-network. Their software components should run on platforms with stringent constraints on node resources. Developers often design their programs by trial-and-error with a view to meeting these constraints. Through numerous iterations, they manually measure and estimate how far the programs cannot fulfill the requirements,...
We derive closed-form expressions for the exact average bit error rate (BER) of hierarchical square M-ary quadrature amplitude modulations (M-QAMs), when these modulation schemes are used along with orthogonal space-time block coding (STBC) over correlated multiple-input multiple-output (MIMO) Nakagami-m fading channels with arbitrary fading parameters. The derived formulae can be used to assess the...
In the recent decade, H. R. Walker and others presented a high spectral efficient modulation - VMSK. According to their analyses, VMSK modulation can reach 30 bit/s/Hz and even more simply without loss of SNR. In this paper, the waveform of VMSK is decomposed based on the time domain. The performance of VMSK is analyzed at signal power spectrum point. An example is given to show that the spectral...
In this paper, we present a novel set of frequency hopping (FH) sequences which have few-hit zone (FHZ). Different from the existing FH sequences with no-hit zone (NHZ), the proposed set not only has good correlation properties within FHZ, but also has a large family size. The quasi-synchronous frequency hopping code division multiple access (QS-FH-CDMA) systems using such FH sequences with FHZ can...
In this paper, we derive a novel closed-form expression for the achievable average channel capacity of combined transmit and receive antenna diversity schemes on the downlink of wideband code-division multiple-access (WCDMA) third-generation systems. We consider open loop and closed loop versions of both maximal ratio combining (MRC) and selection diversity (SD), and study the impact of the various...
Time-hopping (TH) sequences play an important role in time-hopping ultra wideband (TH-UWB) communication systems. The proper measure for the performance of TH sequences is time-hopping correlation function (TH-CF). For TH sequences with a long period, the total number of computations to implement directly TH-CF will be huge, and it will increase very rapidly as the period increases. Hence, it is of...
A novel approach to the calculation of the extinction cross-sections of resonant metallic nanoparticles subject to optical radiation is presented. This approach is based on the boundary integral equation technique and makes extensive use of the optical theorem. The good agreement between the computational results for the extinction cross-sections of spherical resonant metallic nanoparticles and the...
A novel boundary integral equation based technique for the direct computations of resonance frequencies of metallic nanoshells with silicon cores is presented. In this technique, the calculation of resonance frequencies is reduced to a generalized eigenvalue problem. Numerical results that demonstrate a fairly good agreement with available experimental data are reported
A novel technique for the numerical analysis of plasmon resonances by using fast multipole method (FMM) is presented. This approach is based on the solution of eigenvalue problem for boundary integral equations, which can be naturally implemented by using the fast multipole method. Numerical examples that highlight the efficiency of the fast multipole implementation are reported
A novel numerical approach to the analysis of nanoparticle-structured plasmon waveguides of light is presented. The resonance (propagation) frequencies are computed for various geometries of these waveguides and compared with available experimental data. The computational results for resonance frequencies corresponding to different light polarizations are reported as well
For various applications in image, communications, signal processing, 2-D complementary orthogonal (CO) sequences with zero correlation zone (ZCZ) are widely investigated. In this paper, new lower bounds for 2-D CO sequences with ZCZ, based on matrix theory on rank, are derived and presented. As a direct application to our results, upper bounds on family size of 2-D mutually complementary orthogonal...
In general, the base station (BS) is fixed in the mobile communication system, however, which will be altered in some especial situations. To ensure the better communication, both BSs and mobile stations (MSs) of mobile communication network should be able to move in the network, namely entire mobility, which doesn't affect the communication of MSs. However, the route between BSs fixed doesn't adapt...
In this paper, a novel time-hopping (TH) sequences family with TH zero correlation zone (ZCZ) for approximately synchronized time-hopping spread spectrum ultra wideband (THSS-UWB) systems is presented. When the approximate chip synchronization is held in the whole system, the multiple-access interference (MAI) of THSS-UWB systems employing the proposed ZCZ TH sequences is eliminated, and such THSS-UWB...
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