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检索条件"主题词=modulation coding"

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Trellis coded color quantization of images

Trellis coded color quantization of images

引用

IEEE International Conference on Image Processing

作者： S.S. Cheng Zixiang Xiong Jian Qiao Huang Department of Electrical Engineering University of Hawai Honolulu HI USA

We examine color quantization of images using trellis coded quantization (TCQ). Together with a simple dithering scheme, an 8-bit trellis coded color quantizer reproduces images that are visually indistinguishable from the 24-bit originals. The proposed algorithm can be viewed as a predictive trellis coded color quantization scheme. It is universal in the sense that no training or lookup table is needed. The complexity of TCQ is linear with respect to image size, making trellis coded color quantization suitable for interactive graphics and a window-based display environment.

关键词： Color Iterative algorithms Graphics Cathode ray tubes Vector quantization Clustering algorithms modulation coding Rate-distortion Labeling Table lookup

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Hybrid channel allocation in wireless networks

Hybrid channel allocation in wireless networks

引用

IEEE Conference on Vehicular Technology (VTC)

作者： A. Hac Zhengping Chen Department of Electrical Engineering University of Hawaii Manoa Honolulu HI USA

We present a new hybrid channel allocation method which includes both the nominal channel allocation and dynamic channel allocation. More efficient channel usage is achieved through co-channel distance minimization. To further improve the performance, there is no division of fixed and dynamic channel groups. The dynamic channel pool includes all the channels in the system.

关键词： Channel allocation Intelligent networks Wireless networks Wireless communication Frequency conversion Base stations Communication switching Interference Communications technology modulation coding

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One-shot multi-user cancellation receiver for wireless CDMA communication systems

One-shot multi-user cancellation receiver for wireless CDMA ...

引用

IEEE Conference and Exhibition on Global Telecommunications (GLOBECOM)

作者： R. Fantacci S. Morosi F. Panchetti E. E. Department LENST Laboratory University of Florence Florence Italy

This paper deals with a multiuser cancellation detection scheme for direct sequence code division multiple access (DS/CDMA) communication systems where the BPSK modulation technique is used in transmission. Asynchronous users and multipath fading phenomena are considered. The proposed receiver, named the one-shot detector is supposed to be used at the end of an uplink terrestrial channel. The one-shot receiver basic assumption is to divide signals into reliable and unreliable ones. The reliable signals are directly detected and cancelled from the whole received signal so as to improve the decision on unreliable signals. A suitable analytical approach is proposed in order to evaluate error probability (P/sub e/) of the receiver under consideration. Simulation results are also presented to validate obtained analytical predictions. The results shown here clearly demonstrate that the proposed receiver exhibits better performance and lowers the computational complexity and processing delay in comparison with previously proposed alternatives.

关键词： Multiaccess communication Direct-sequence code-division multiple access Binary phase shift keying modulation coding Fading Detectors Signal detection Error probability Computational modeling Analytical models

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Constrained coding techniques for soft iterative decoders

Constrained coding techniques for soft iterative decoders

引用

IEEE Conference and Exhibition on Global Telecommunications (GLOBECOM)

作者： J.L. Fan J.M. Cioffi Department of Electrical Engineering Stanford CA USA Department of Electrical Engineering University of Stanford USA

Soft iterative decoding of turbo codes and low-density parity check codes has been shown to offer significant improvements in performance. To apply soft iterative decoding to digital recorders, where binary modulation constraints are often used, modifications must be made to allow reliability information to be accessible by the decoder. A solution is proposed which uses a modified concatenation scheme, in which the positions of the modulation and error-correcting codes are reversed. In addition, a soft decoder based on the BCJR algorithm is introduced for the modulation constraint, and improved performance is obtained by iterating with this soft constraint decoder.

关键词： Iterative decoding modulation coding Error correction codes Parity check codes Demodulation Digital modulation Constraint theory Optical recording Code standards Turbo codes

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Fast acquisition method for DS-CDMA systems employing asynchronous base stations

Fast acquisition method for DS-CDMA systems employing asynch...

引用

IEEE International Conference on Communications (ICC)

作者： S. Sriram S. Hosur Texas Instruments DSPS R&D Center Dallas TX USA

There has been significant interest in cellular systems employing direct sequence CDMA, with no synchronization requirement between base-stations (BS), especially in the context of the so-called third generation wireless systems. In this case, since neighboring BS use different spreading sequences, the mobile must first determine the spreading sequence being used by the base station(s) from which the mobile receives sufficiently strong signals. To facilitate acquisition, the total set of spreading sequences is divided into groups, and the group identification is transmitted over a synchronization channel. This paper describes a novel mechanism for transmitting the group ID using cyclically permutable (CP) codes; this scheme results in significant reduction in the search space, allowing for rapid acquisition. The technique described is currently a component of the ARIB and ETSI proposals to the ITU, for third generation wireless systems (IMT-2000).

关键词： Multiaccess communication Base stations Timing Space technology Telecommunication standards Proposals Spread spectrum communication modulation coding Standards organizations Pulse modulation

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Power-efficient coded modulation and precoding schemes for wireless infrared communications

Power-efficient coded modulation and precoding schemes for w...

引用

IEEE International Conference on Communications (ICC)

作者： Hyuncheol Park Telecommunication & Network Laboratory Samsung Electronics Company Limited Suwon South Korea

We design new trellis codes based on multiple pulse-position modulation (MPPM) that offer high power efficiency. We randomly search for the optimal code that produces the trellis code with the largest minimum Euclidean distance. To verify our results, we derive an approximation for the minimum distance. We combine partial-response precoding with parallel decision-feedback detection to equalize and to decode the trellis codes. The performance of the proposed scheme is compared to linear equalization, decision feedback equalization, parallel decision-feedback detection, and super-state maximum-likelihood sequence detection. Together, the proposed trellis codes and precoding schemes are an effective solution to the signaling design problem, especially in the face of severe multipath dispersion.

关键词： modulation coding Convolutional codes Decision feedback equalizers Pulse modulation Euclidean distance Maximum likelihood decoding Maximum likelihood detection Signal design Face detection Dispersion

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Adjacent channel selectivity for land mobile radio systems

Adjacent channel selectivity for land mobile radio systems

引用

IEEE Conference on Vehicular Technology (VTC)

作者： M.S. El-Tanany S.A. Hanna G.K. Chan Dept. of Syst. & Comput. Eng. Carleton Univ. Ottawa Ont. Canada Spectrum Engineering Branch Industry Canada Ottawa Canada Communications Rcscarch Centre Ottawa Canada

A variety of analogue and digital radio systems with different channel bandwidths operate in the land mobile frequency bands. Spectrum congestion in some of these bands, coupled with advances in DSP technology, vocoding technology as well as modulation and coding techniques are driving the move towards narrow-band channels. It therefore became essential to have an algorithm to carry out interference analysis between transmitters and receivers that may be utilizing different channel bandwidths or even different transmission technologies. To complicate this issue further, standards for radio receivers are no longer mandatory in Canada and the United States. At the same time, many of the radio receivers in use are proprietary. As a result, a need arose for the development of models for the adjacent channel frequency selectivity of the receiver. In this paper, models are developed for the interfering signal power spectral density and for the frequency selectivity of radio receivers. These models are intended for interference prediction among land mobile radio systems.

关键词： Land mobile radio Receivers Frequency Power system modeling Bandwidth Interference Digital communication Couplings Digital signal processing modulation coding

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New PN even balanced (PN-EB) sequences for high processing gain DS-SS systems

New PN even balanced (PN-EB) sequences for high processing g...

引用

Midwest Symposium on Circuits and Systems (MWSCAS)

作者： J.A.L. Inacio J.A.B. Gerald M.D. Ortigueira INESC Lisbon Portugal MESC Portugal

The design of new sequences for high processing gain (PG) in DSSS systems with band limited noise channel and no aliasing, is shown. The PN-EB sequences present the same number of "zeroes" and "ones"", and zero mean. The number available is very large. All perform with very good secondary peak level of autocorrelation.

关键词： Shift registers Spread spectrum communication modulation coding Signal processing Communication systems Bandwidth Signal to noise ratio Performance gain Binary phase shift keying Quadrature phase shift keying

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Differentially coherent code acquisition in jamming and data modulation

Differentially coherent code acquisition in jamming and data...

引用

MILCOM, Military Communications Conference

作者： J. Iinatti A. Pouttu Telecommunication Laboratory Centre for Wireless Communications University of Oulu Oulu Finland

This paper considers the use of differentially coherent (DC) matched filter (MF) code acquisition in a direct-sequence (DS) spread-spectrum system. Simulation results in tone jamming and with data modulation are presented. The performance of the structure is compared to conventional noncoherent (NC) MF acquisition. The performance measure is the mean acquisition time, T/sub MA/. The results indicate that the differentially coherent method is a robust method by allowing the use of post detection integration also in case of jamming and data modulation, in addition to quite severe Doppler shifts.

关键词： Jamming modulation coding Matched filters Frequency synchronization Doppler shift Envelope detectors Signal to noise ratio Laboratories Wireless communication Electronic mail

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Teletraffic analysis of enhanced circuit switched data (ECSD) on GSM for mobile multimedia services

Teletraffic analysis of enhanced circuit switched data (ECSD...

引用

IEEE International Workshop on Mobile Multimedia Communications, MoMuC

作者： M.A. Kazmi J. Brouet P. Godlewski V. Kumar Ecole Nationale Supérieure des TéIécommunications Paris France Alcatel Corporate Research Center Nanterre France

The Global System for Mobile Communications (GSM) has been a great success in providing both voice and low speed data services. The current evolution of GSM towards the third generation mobile communications system is attributed to its remarkable growth and also to the increasing demand for mobile data. The enhanced circuit switched data on GSM (ECSD) is one of the major evolutionary steps to serve real time high speed data services such as real time video and or file transfer. The ECSD enhances the bandwidth by combining several time slots and by utilizing efficient modulation and coding schemes. In this paper we present a Markov analysis of ECSD and compare its performance with the existing high speed circuit switched data on GSM (HSCSD), which also uses multi-slot allocation but with a conventional GSM physical air-interface. In this analysis we also consider the transmission errors on the radio interface. The results of the comparative analysis are presented in terms of grade of service, average throughput and average message transfer delay taking into account eventual transmission errors on the radio link.

关键词： Circuit analysis Switching circuits GSM Communication switching 3G mobile communication Bandwidth modulation coding Performance analysis Throughput Delay

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