共查询到20条相似文献,搜索用时 62 毫秒
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本文对整个系统功能通过数据存储模块、系统主模块、查询地址模块、路径规划模块、跟踪路径展示模块、新建跟踪模块模块以及远程跟踪模块来实现。 相似文献
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随着社会经济的高速发展,网络融入了人们的生活,而网络购物逐渐成了人们的一种时尚,该系统采用ASP.NET+SQLServer2000+ADO.NET实现,系统结构采用B/S结构模式。本系统总共分为8个模块:数据库设计模块、用户注册模块、产品信息浏览模块、购物车模块、结算中心模块、客户留言模块、网站新闻模块和后台管理模块。 相似文献
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文中介绍一种可以实现电子音量噪声抑制的模块。该模块主要有运算放大器模块、可调电阻Rf模块、I2C总线控制模块、数据缓冲模块、增益数据模块、时间基准模块、分压模块和输出缓冲模块组成。文章介绍了音频信号处理芯片的组成及原理,重点对音量控制部分进行阐述,对数字音量控制开关产生的噪声抑制方法进行了详细的分析。该芯片采用BICMOS工艺,工作电压在9V左右,实现了低失真低噪声的音频信号处理。 相似文献
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在简述MSTP技术优势的基础上,研究了基于SDH的MSTP的设计与实现。讨论了平台的硬件和软件构成,详细介绍了平台硬件的功能模块——控制管理模块、交叉连接模块、以太网模块、E1模块、光接口模块、时钟同步和分配模块和电源模块,管理软件的功能模块——开销管理模块、设备配置管理模块、设备告警管理模块,并指出基于SDH的MSTP平台的有关结论和发展方向。 相似文献
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将PLC通信系统分为传输模块、网络模块和特殊模块3部分,进而描述各个模块的具体功能,再进行功能模块的划分、硬件电路的设计、接口条件的分析、软件的模块划分和分层处理,其中着重给出了关键模块的设计方案,并总结了PLC关键模块的应用. 相似文献
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This paper presents a high-performance coherent π/4-shift differential quaternary phase shift keying (DQPSK) demodulator (large scale integrated circuit) LSIC for the personal communication system in Japan, which is implemented on a 2-V operation 0.8-μm CMOS standard cell. The developed LSIC achieves a better bit error rate (BER) and frame error rate (FER) performance and a lower power consumption than conventional demodulators by employing new schemes: (1) a reverse-modulation carrier recovery circuit with a -π/4 phase rotator and a bandwidth-changeable carrier filter; (2) a bit timing recovery circuit using an initial bit timing estimation scheme; and (3) a fully digital orthogonal detector suitable for low power consumption. Performance evaluation confirms that the developed demodulator LSIC reduces the irreducible frame error rate by 40% and achieves an Eb/No improvement of 3 dB at an FER of 10-1 compared with differential detection in the Rayleigh fading typical of personal communication channels 相似文献
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The linear successive interference canceler (LSIC) is a multiuser detector that employs the magnitude of the matched filter (MF) output as the received amplitude estimate of the detected user for use in signal reconstruction. This paper investigates the performance of the LSIC when random spreading sequences are employed. Specifically, the conditional mean and the signal-to-interference-plus-noise ratio (SINR) of the decision variable in each stage are derived to quantify the effects due to imperfect symbol and amplitude estimates. In addition, under the constraint that each user must achieve a certain SINR requirement, we examine the received powers needed for each of a specified number of users and the maximum number of users that a system can support when the LSIC is used in a base station. Computer simulations are presented to compare these results with those of several linear multiuser detectors. 相似文献
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Chien-Hwa Hwang Chang-Su Kim Kuo C.-C.J. 《Communications, IEEE Transactions on》2003,51(11):1858-1870
The signal-to-interference-plus-noise-ratio performance of the multistage linear parallel and successive interference cancellers (LPIC and LSIC) in a long-code code-division multiple-access system is analyzed using a graphical approach. The decision statistic is modeled as a Gaussian random variable, whose mean and variance can be expressed as functions of moments of R for the LPIC and L for the LSIC, respectively, where R is the correlation matrix of signature sequences and L is the strict lower triangular part of R. Since the complexity of calculating these moments increases rapidly with the growth of the stage index, a graphical representation of moments is developed to facilitate the computation. Propositions are presented to relate the moment calculation problem to several well-known problems in graph theory, i.e., the coloring, the graph decomposition, the biconnected component finding, and the Euler tour problems. It is shown that the derived analytic results match well with simulation results. 相似文献
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Kobayashi K. Kubota S. Enomoto K. Seki K. Kawazoe K. Sakata T. Matsumoto Y. Hattori T. 《Very Large Scale Integration (VLSI) Systems, IEEE Transactions on》1998,6(4):687-696
This paper presents a very low power consumption one-chip baseband large-scale integrated circuit (LSIC) for personal communication terminals. It comprises a π/4-shift QPSK modem, an adaptive differential pulse code modulation (ADPCM) codec, a time division multiple access time division duplex (TDMA-TDD) controller and a link access procedure for a digital cordless (LAPDC: Layer-2 protocol) controller. The developed LSIC meets all the specifications of the personal handy-phone system (PHS) standard. By employing a novel coherent demodulator and an ADPCM codec with a click noise suppressor, a higher quality voice transmission has been achieved in a fading environment. In addition, it has 61-kb/s data transmission capability to achieve wireless multimedia services based on PHS. Moreover, the novel circuit configurations of the modem, the ADPCM codec, the TDMA-TDD controller, and the LAPDC controller achieve significant power reduction of the baseband circuits (57.4 mW) of personal communication terminals. It enables very low power consumption wireless multimedia terminals to be achieved based on the PHS common air interface 相似文献
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Very low power consumption Viterbi decoder LSIC employing the SST(scarce state transition) scheme for multimedia mobile communications 总被引:2,自引:0,他引:2
A very low power consumption Viterbi decoder LSIC has been developed by using a low supply voltage 0.8 μm CMOS masterslice process technology. By employing the scarce state transition (SST) scheme, this LSIC achieves a drastic reduction in power consumption below 600 μW at a supply voltage of 1 V when the data rate is 1152 kbit/s and the bit error rate is less than 10-3. This excellent performance has paved the way to employing the strong forward error correction and low power consumption portable terminals for personal communications, mobile multimedia communications, and digital and audio broadcasting 相似文献
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The linear successive interference canceler (LSIC) is a multiuser detector that separates code-division multiple-access (CDMA) signals in a multistage manner. In each stage, a user is detected, and its contribution is regenerated and canceled from the input of that stage. A user's spreading sequence is employed for despreading and respreading, and the magnitude of the despreader output is used as the amplitude estimate to reconstruct that user's signal. This paper describes a generalized version of the LSIC (GLSIC) that employs various types of linear filters for the despreading and respreading operations. We analyze the bit error rate (BER), asymptotic multiuser efficiency (AME), and the mean and variance of the amplitude estimates of the GLSIC. It is shown that for certain choices of linear filters, complete cancellation of a user can be achieved, irrespective of the reliability of the symbol estimates. We also demonstrate that, from a BER and AME viewpoint, it is not beneficial to use a linear canceler with a decorrelator or a minimum mean-square-error (MMSE) receiver. 相似文献
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A. I. Chumakov 《Russian Microelectronics》2011,40(3):149-155
The estimations of equivalent values for linear energy transfer of heavy charged particles based on the results of experimental
investigations of sensitivity of LSICs to local radiation effects with the use of the procedure of local laser irradiation
are presented. The possibility of recalculation of the energy of laser radiation into equivalent values of linear energy transfer
with the use of the measurements of the ionization reaction in the supply circuit of LSIC is substantiated. Uncertainties
caused by the characteristics of the interaction of optical radiation with semiconductor structures are eliminated in the
suggested procedure. 相似文献
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P. A. Kuznetsov I. S. Moshchev 《Journal of Communications Technology and Electronics》2016,61(10):1205-1210
The design of a 14-bit delta-sigma analog-to-digital converter (ADC) with pipelined readout is considered. Basic concepts of the design of array photodetectors of the infrared (IR) range with an ADC in the accumulating cell are analyzed. The presence of an ADC in the readout large-scale integrated circuit (LSIC) cell provides an opportunity to increase the accumulation time by more than an order of magnitude and improve the threshold characteristics. A method for optimization of the ADC area by using an LFSR counter operating in two modes (digital code generation and serial readout) is proposed. 相似文献
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A. V. Sogoyan 《Russian Microelectronics》2011,40(3):185-193
A method of testing CMOS VLSIs for resistance to the factor of the absorbed dose under the effect of high-intense pulsed ionizing
radiation by the results of analysis of the reaction of the LSIC in the radiation field of a sequence of relatively low-intense
pulses is suggested and substantiated. The approach makes it possible to evaluate the levels of radiation resistance of CMOS
LSICs at small simulating installations under the dose gained in the mode of a series of pulses. Conservatism is provided
with respect to charge transfer and relaxation in the oxide of MOS structures being independent of the field mode and sample
topology. 相似文献