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检索条件"主题词=modulation coding"

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Two-Dimensional Patiial Response Class IV Recording Codes

Two-Dimensional Patiial Response Class IV Recording Codes

引用

Conference on Magnetic Recording

作者： R. Swanson Eastman Kodak (Japan) Limited San Diego CA USA

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Performance analysis of an alternative to trellis coded modulation for a waveform transmitted over a channel with pulse-noise interference

Performance analysis of an alternative to trellis coded modu...

引用

MILCOM, Military Communications Conference

作者： Mario Marques R. Clark Robertson Department of Electrical and Computer Engineering Graduate School of Engineering and Applied Sciences Naval Postgraduate School Montreal CA USA

The performance of a communication system having almost the same spectral efficiency as a trellis coded modulation (TCM) system with r = 2/3 convolutional encoding and 8-ary phase-shift keying (8-PSK) modulation is investigated. TCM is a common solution to the problem of adding forward error correction (FEC) coding without an attendant increase in channel bandwidth. The primary drawback to TCM is that the achievable coding gain is limited by the maximum practical number of states in the convolutional encoder. The alternative system considered uses (63, 37) Reed-Solomon (RS) encoding. The six-bit symbols at the output of the Reed-Solomon encoder undergo serial-to-parallel conversion to two three-bit symbols, which are then independently transmitted on the in-phase and quadrature components of the carrier using 8-ary biorthogonal keying. This system has a null-to-null bandwidth of 0.993R b , which is 0.7% smaller than TCM with r = 2/3 convolutional encoding and 8-PSK modulation. The two waveforms are compared for the relatively benign case where additive white Gaussian noise is the only noise present as well as when pulse-noise interference is present.

关键词： Pulse modulation Performance analysis modulation coding Interference Convolutional codes Phase modulation Forward error correction Bandwidth Reed-Solomon codes Additive white noise

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Simple decentralised market-oriented allocation of sub-channels and power for access-point to terminal multi-carrier communication

Simple decentralised market-oriented allocation of sub-chann...

引用

Annual Conference on Information Sciences and Systems (CISS)

作者： Virgilio Rodriguez Rudolf Mathar Institute for Theoretical Information Technology RWTH Aachen University of Technology Aachen Germany

Common auction formats are well-understood, relatively simple mechanism which have long been used for allocating an indivisible good to the party that values it the most, for such reasons as speed of allocation, discovery of the true ¿value¿ of the object, and fraud prevention. Various auction schemes have been proposed for the allocation of telecommunication resources. The Dutch auction (the price progressively falls until a participant buys the object) has several major virtues: (i) a bid-processing protocol that automatically and simply prioritises the highest bid(s); (ii) possibility of distributive (auctioneer-free) implementation for synchronised terminals; (iii) confirmation of transmitter-receiver pairs at auction time, with smooth continuation if the pair is infeasible; (iv) exceptional signalling economy (the only strictly necessary signal is the winning bid). Below, we utilise this auction for sub-channel allocation in the access-point to terminal link of an orthogonal frequency-division multiple-access (OFDMA) network. Concurrently, we utilise a pricing scheme for power allocation. This results in a relatively simple, decentralised scheme for sub-channel and power allocation. Secure software inside each terminal may record transactions for eventual payment collection, or the auction can be interpreted as a prioritised decentralised allocation algorithm, without real money exchange.

关键词： Resource management Radio spectrum management Throughput Cost accounting Information technology Protocols Frequency synchronization Pricing Software algorithms modulation coding

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Supplement multi-media services for ACeS

Supplement multi-media services for ACeS

引用

MILCOM, Military Communications Conference

作者： You-Yun Xu Wen-Tao Song Han-Wen Luo Department of Electronic Engineering Shanghai Jiaotong University Shanghai China

Asia Cellular Satellite System (ACeS) is a $900 million fully financed project that uses two A2100AX geo satellites manufactured by Lockheed Martin. The services of the original design are voice, data, fax and paging throughout Southeast Asia, China and India. In this paper, we present a supplementary design, which called ACeS Multi-media System (AMS), for the original ACeS to offer some more narrow-band multi-media services such as Internet, Intranet and ISDN services to mobile or fixed users thus to make it more competitive in the market. The paper discusses the system description, frame/burst formats of satellite transmission links, design of the combining scheme of turbo codes and QAM modulation etc. This system can also be modified for military communications.

关键词： Asia Multimedia systems Manufacturing Narrowband Web and internet services ISDN Military satellites Turbo codes Quadrature amplitude modulation modulation coding

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An efficient algorithm for computing bounds on the average transmitted power in generalized partial response

An efficient algorithm for computing bounds on the average t...

引用

Proceedings of GLOBECOM '93. IEEE Global Telecommunications Conference

作者： G.M. Pitstick J.R. Cruz School of Electrical Engineering University of Oklahama Norman OK USA

An algorithm for computing bounds on the average transmitted power in generalized partial response signaling, also known as Tomlinson-Harashima (TH) precoding, is presented and its derivation is outlined. This algorithm requires knowledge of the marginal probability distributions of the input signal constellation, and is only appropriate when the domains of the marginal distributions are a subset of the set of even integers or a subset of the set of odd integers. These computed bounds are a generalization of the closed form bounds derived by Maze and Salt (1976) for symmetrical PAM constellations and rectangular QAM constellations with equally probable symbols.< >

关键词： Constellation diagram Quadrature amplitude modulation Power engineering computing Partial response signaling Filters Probability distribution modulation coding Signal to noise ratio Telephony Modems

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Dynamic physical layers for wireless networks using software radio

Dynamic physical layers for wireless networks using software...

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International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： V. Bose R. Hu R. Morris Vanu Inc. Cambridge MA USA Laboratory for Computer Science MIT USA

The communication parameters in mobile ad-hoc networks, such as the distance between nodes, channel characteristics and user demands, can vary quickly. Using traditional design techniques and creating a static physical layer designed to meet worst case conditions results in poor performance and resource utilization under most operating conditions. Software radios, which implement their physical layer processing in software, provide a solution to this problem by enabling the physical layer to be modified in a way that best meets the current conditions. This paper describes the initial work on a software radio-based ad-hoc network that allows the physical layer to be modified on a per packet basis.

关键词： Wireless networks Software radio Physical layer modulation coding Bandwidth Mobile communication Ad hoc networks Wireless communication Application software Software testing

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Space-Time OFDM with Adaptive Beamforming for Wireless Multimedia Applications

Space-Time OFDM with Adaptive Beamforming for Wireless Multi...

引用

International Conference on Information Technology and Applications, ICITA

作者： T. Athanasiadis K.H. Lin Z.M. Hussain School of Electrical and Computer Engineering RMIT University Melbourne VIC Australia

It is well known that the transmission of multimedia data over wireless channels poses significant constraints on the communication system bandwidth, energy, and latency. To overcome these bottlenecks to wireless multimedia communication, various adaptive compression, modulation, and channel coding schemes have been proposed. Space-time block coding (STBC) with adaptive beamforming represents an effective means of improving the performance and capacity of wireless multimedia systems utilizing OFDM. In this paper, we introduce a multimedia simulation framework employing STBC-OFDM for the investigation of system characteristics in the application of multimedia data such as, digital audio/images/video. Simulation results, based on the transmission of compressed images, showed that the performance improvement introduced by STBC-OFDM with adaptive beamforming could readily be observed even without extensive numerical analysis as traditionally expected

关键词： Array signal processing Multimedia systems Bandwidth Delay Wireless communication Multimedia communication modulation coding OFDM modulation Channel coding Block codes

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Linear electro-optic coefficient in multilayer self-organized InAs quantum dot structures

Linear electro-optic coefficient in multilayer self-organize...

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Conference on Lasers and Electro-Optics (CLEO)

作者： B. Imran Akca Aykutlu Dana Atilla Aydinli Marco Rossetti Lianhe Li N. Dagli Andrea Fiore Material Science and Nanotechnology Department Bilkent University Ankara Turkey Physics Department Bilkent University Ankara Turkey Institute of Quantum Electronics and Photonics Ecole Polytechnique Fédérale de Lausanne Lausanne Switzerland ECE Department University of California슠Santa Barbara CA USA

The electro-optic coefficients of self-organized InAs quantum dot layers in molecular beam epitaxy grown laser structures in reverse bias have been investigated. Enhanced electro- optic coefficients compared to bulk G... 详细信息

ISBN: (纸本)9781424435906

关键词： Nonhomogeneous media Quantum dots Quantum dot lasers Optical modulation Fiber nonlinear optics Nonlinear optics Optical devices Electrooptic modulators modulation coding Optical waveguides

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Minimum variance multiuser detection for impulse radio UWB systems

Minimum variance multiuser detection for impulse radio UWB s...

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IEEE Conference on Ultra Wideband Systems and Technologies

作者： Ping Liu Zhengyuan Xu Jin Tang Department of Electrical Engineering University of California CA USA

ISBN: (纸本)0780381874

The minimum variance (MV) technique minimizes output variance of a receiver subject to a constraint, which guarantees no cancellation of the desired signal while interference is mitigated. It has been successfully applied to multiuser detection for a direct sequence code-division multiple access (CDMA) system even when multipath channel is unknown. Its applicability in multiple access ultra-wideband (UWB) systems is investigated in this paper. First, similarities between a time-hopping (TH) UWB system using pulse position modulation (PPM) and a multirate CDMA system are explored where a code matrix for each user can be defined based on its unique TH sequence, similar to a spreading code matrix in a CDMA system. Meanwhile, modulation delays are transformed to amplitudes of pulses, yielding a virtually linear model. After following MV optimization procedures, the desired signal can be detected from outputs of a bank of receivers. Performance of the proposed detection criterion is analyzed and verified.

关键词： Multiuser detection Multiaccess communication Pulse modulation Receivers Interference constraints Interference cancellation Multipath channels Ultra wideband technology modulation coding Amplitude modulation

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Punctured trellis (P-Trellis) coded frequency/phase modulation in faded mobile satellite channels

Punctured trellis (P-Trellis) coded frequency/phase modulati...

引用

National Conference on Radio Science (NSRC)

作者： R. El-Awady M.A. Bahie Eldin L.F. Gergis Faculty of Engineering Mansoura University

ISBN: (纸本)9775031680

A set of high-rate punctured convolutional codes can be implemented by the periodic elimination (puncturing) of a low rate 1/n of the original code. The main advantage for this system is that a single Viterbi decoder matched to the lower rate of the original code can be used to decode all higher rates obtained by puncturing this one code. This paper studies the performance of punctured trellis coded modulation of constant envelope frequency and phase (FPM) modulated signal sets for AWGN and fading mobile satellite channels. Results showed the superiority of proposed modulation scheme over other types of modulation.

关键词： Frequency Phase modulation Decoding Convolutional codes Fading Satellite broadcasting modulation coding Viterbi algorithm Error correction codes Bandwidth

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