Xem 1-20 trên 30 kết quả Signaling schemes
  • The two fundamental building blocks of a digital communication system are modulation and channel coding. They enable reliable communication by providing signaling schemes and receiver structures that utilize the available spectrum and power efficiently.

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  • This book provides a comprehensive introduction to the underlying theory, design techniques and analytical tools of wireless communications, focusing primarily on the core principles of wireless system design. The book begins with an overview of wireless systems and standards. The characteristics of the wireless channel are then described, including their fundamental capacity limits. Various modulation, coding, and signal processing schemes are then discussed in detail, including state-of-the-art adaptive modulation, multicarrier, spread spectrum, and multiple antenna techniques....

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  • Filter Banks and Wavelets The methods of designing bases that we will employ draw on ideas first used in the construction of multirate filter banks. The idea of such systems is to take an input system and split it into subsequences using banks of filters. This simplest case involves splitting into just two parts using a structure such as that shown in Fig. 35.1. This technique has a long history of use in the area of subband coding: first of speech [1, 2] and more recently of images [3, 4]. In fact, the most successful image coding schemes are based on...

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  • Introduction to digital modulation Relevant Modulation Schemes (QPSK, GMSK, M-Ary Schemes) Coherent and Differential Reception The impact of the mobile channel on digital modulation – noise and interference – random FM (narrowband fading) – intersymbol interference (wideband fading The bit rate defines the rate at which information is passed. l The baud (or signalling) rate defines the number of symbols per second. Each symbol represents n bits, and has M signal states, where M = 2n. This is called M-ary signalling....

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  • Speech signals have a very wide dynamic range: Harsh “oh” and “b” type sounds have a large amplitude, whereas softer sounds such as “sh” have small amplitudes. If a uniform quantization scheme were used then although the loud sounds would be represented adequately the quieter sounds may fall below the threshold of the LSB and therefore be quantized to zero and the information lost. Therefore non-linear quantizers are used such that the quantization level at low input levels is much smaller than for higher level signals.

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  • Estimating the directions of arrival (DOAs) of propagating planewaves is a requirement ina variety of applications including radar, mobile communications, sonar, and seismology. Due to its simplicity and high-resolution capability, ESPRIT (Estimation of Signal Parameters via Rotational Invariance Techniques) [18] has become one of the most popular signal subspace-basedDOAor spatial frequency estimation schemes. ESPRIT is explicitly premised on a point source model for the sources and is restricted to use with array geometries that exhibit so-called invariances [18]....

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  • GSM supports the following subscriber services: 1. Dual tone multi frequency (DTMF) tone signaling scheme used for control purposes E.g. Remote control of an answering machine 2. Facsimile group III GSM supports CCITT group III Facsimile Special fax converter forms junction between standard Special fax converter forms junction

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  • Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí sinh học Journal of Biology đề tài: Research Article A Baseband Signal Processing Scheme for Joint Data Frame Synchronization and Symbol Decoding for RFID Systems

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  • Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article Lossless Compression Schemes for ECG Signals Using Neural Network Predictors

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  • EURASIP Journal on Applied Signal Processing 2003:3, 244–251 c 2003 Hindawi Publishing Corporation An Adaptive Video Coding Control Scheme for Real-Time MPEG Applications Shih-Chang Hsia Department of Computer and Communication Engineering, National Kaohsiung First University of Science and Technology, Kaohsiung 824, Taiwan Email: hsia@ccms.nkfust.edu.tw Received 27 February 2002 and in revised form 16 September 2002 This paper proposes a new rate control scheme to increase the coding efficiency for MPEG systems.

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  • EURASIP Journal on Applied Signal Processing 2003:10, 1001–1015 c 2003 Hindawi Publishing Corporation Watermarking-Based Digital Audio Data Authentication Martin Steinebach Fraunhofer Institute IPSI, MERIT, C4M Competence for Media Security, D-64293 Darmstadt, Germany Email: martin.steinebach@ipsi.fraunhofer.de Jana Dittmann Platanista GmbH and Otto-von-Guericke University Magdeburg, 39106 Magdeburg, Germany Email: jana.dittmann@iti.cs.uni-magdeburg.

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  • Furthermore, Borghesi (1999) suggested that market signals or the ‘existence of an endogenous self-regulatory market mechanism for the use of natural resources’ may also explain the shape of the EKC. According to him, during the early stages of development there is heavy exploitation of natural resources leading to a reduction of natural capital. However, at a certain time, there comes an increase in the price of natural resources. This leads to a reduction in its exploitation. Furthermore, there is an ‘accelerated shift towards less resource- intensive technologies’.

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  • Tham khảo sách 'krone - guide book - digital building access guideline', công nghệ thông tin, quản trị mạng phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả

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  • Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article Vector Field Driven Design for Lightweight Signal Processing and Control Schemes for Autonomous Robotic Navigation

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  • Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: PN Sequence Preestimator Scheme for DS-SS Signal Acquisition Using Block Sequence Estimation

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  • In electronics and telecommunications, modulation is the process of varying one or more properties of a high-frequency periodic waveform, called the carrier signal, with a modulating signal which typically contains information to be transmitted. This is done in a similar fashion to a musician modulating a tone (a periodic waveform) from a musical instrument by varying its volume, timing and pitch. The three key parameters of a periodic waveform are its amplitude ("volume"), its phase ("timing") and its frequency ("pitch").

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  • Evaluating the average probability of symbol error for different bandpass modulation schemes Comparing different modulation schemes based on their error performances. Channel coding: Transforming signals to improve communications performance by increasing the robustness against channel impairments (noise, interference, fading, ..) Waveform coding: Transforming waveforms to better waveforms Structured sequences: Transforming data sequences into better sequences, having structured redundancy. “Better” in the sense of making the decision process less subject to errors....

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  • S/N ratio should be above a certain threshold (a function of modulation scheme). Signal power should be above the sensitivity threshold. Predict received signal strength when the transmitter and receiver have a clear line-of-sight path between them.

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  • Receiver System Parameters A receiver picks up the modulated carrier signal from its antenna. The carrier signal is downconverted, and the modulating signal (information) is recovered. Figure 5.1 shows a diagram of typical radio receivers using a double-conversion scheme. The receiver consists of a monopole antenna, an RF amplifier, a synthesizer for LO signals, an audio amplifier, and various mixers, IF amplifiers, and filters.

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  • Scheduling Schemes for Handling Overload 4.1 Scheduling Techniques in Overload Conditions This chapter presents several techniques to solve the problem of scheduling real-time tasks in overload conditions. In such situations, the computation time of the task set exceeds the time available on the processor and then deadlines can be missed.

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