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检索条件"主题词=Modulation Coding"

共 7237 条记录，以下是401-410 订阅

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Multiple beamforming with constellation precoding: Diversity analysis and Sphere Decoding

Multiple beamforming with constellation precoding: Diversity...

引用

Information Theory and Applications Workshop, ITA

作者： Hong Ju Park Boyu Li Ender Ayanoglu Center of Pervasive Communications and Computing Department of Electrical Engineering and Computer Science University of California Irvine USA

Multi-Input Multi-Output (MIMO) wireless communication systems commonly employ beamforming techniques with Singular Value Decomposition (SVD). In such systems, if no channel encoding is employed, the full diversity order provided by the channel is achieved when a single symbol is transmitted over multiple channels; however, this property is lost whenever multiple symbols are simultaneously transmitted. The full diversity order can be restored when channel coding is added to such a system. For example, when Bit-Interleaved Coded modulation (BICM) is combined with this technique, the full diversity order of NM in an M × N MIMO channel, transmitting S parallel streams is possible; provided SR c ¿ 1 where R C is the BICM convolutional code rate. In this paper, we present multiple beamforming with constellation precoding which can achieve the full diversity order with both uncoded and BICM-coded SVD systems. An analytical proof of this property is provided. In addition, to reduce the computational complexity of Maximum Likelihood (ML) decoding, we introduce a Sphere Decoding (SD) technique. This technique achieves several orders of magnitude reduction in computational complexity not only with respect to conventional ML decoding, but also, with respect to conventional SD.

关键词： Array signal processing Maximum likelihood decoding MIMO Computational complexity Wireless communication Singular value decomposition Channel coding Interleaved codes modulation coding Strontium

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Hierarchical transmission algorithm in the advanced T-DMB system

Hierarchical transmission algorithm in the advanced T-DMB sy...

引用

IEEE International Conference on Consumer Electronics (ICCE)

作者： Chul seung Kim Min hyuk Kim Ji won Jung Korea Maritime University South Korea

ISBN: (纸本)9781424443147

T-DMB (terrestrial digital multimedia broadcasting) is based on the Eureka-147 standard, and provides various multimedia data services. However T-DMB needs additional services and higher throughput while maintaining good reception. Therefore, this paper proposes an advanced T-DMB system with the unequal error protection system, hierarchical multilevel modulation and various coding schemes recently used for recent wireless communication, while maintaining backward compatibility. Based on the simulation results, the proposed advanced T-DMB system achieves a coding gain of 2-6dB over the conventional T-DMB.

关键词： Digital multimedia broadcasting Throughput Error correction codes modulation coding Computational modeling Convolutional codes Multimedia communication Digital audio broadcasting Bit error rate Noise robustness

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Source coding Rate Allocation in Orthogonal Compress-and-Forward Relay Networks

Source Coding Rate Allocation in Orthogonal Compress-and-For...

引用

IEEE International Conference on Communications (ICC)

作者： G. Zeitler J. Brehmer G. Bauch J. Widmer Institute of Communications Engineering Technische Universität München Germany Associate Institute of Signal Processing Technische Universität München Germany DOCOMO Euro-Laboratories Universität der Bundeswehr Munich Germany DoCoMo Conimunications Laboratories Europe GmbH Germany

The source coding rate allocation problem for the orthogonal multiple-access relay channel with M users and compress-and-forward at the relay is addressed. In case of Gaussian codebooks at the sources and Gaussian channels, we show that the sum-rate-optimal assignment of source coding rate at the relay is given by waterfilling. For general modulation alphabets at the sources and finite-alphabet discrete memoryless channels, the source coding rate allocation problem is formulated using the information bottleneck method, based on which we appropriately modify a standard cutting-plane algorithm to numerically compute an optimal source coding rate vector at the relay.

关键词： Source coding Relays Frequency modulation coding Gaussian channels Memoryless systems Decoding Communications Society Signal Processing Society Laboratories

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A lossless frame recompression scheme for reducing DRAM power in video encoding

A lossless frame recompression scheme for reducing DRAM powe...

引用

IEEE International Symposium on Circuits and Systems (ISCAS)

作者： Xuena Bao Dajiang Zhou Satoshi Goto Graduate School of Information Production and Systems Waseda University Kitakyushu Japan

Owing to the huge bandwidth requirement, the DRAM power composes a significant portion of the power consumed by video coding system. In this paper, a lossless frame recompression scheme for reducing DRAM bandwidth is presented. The basic structure of the scheme which includes the memory organization, the data fetching strategy as well as the cache organization is proposed. Furthermore, an adaptive DPCM (Differential Pulse Code modulation) scanning order selection is used and an efficient coding method that is suitable for compressing the DPCM samples in reference frames is also discussed. Experimental results show a 50%~60% saving of bandwidth on 720p and 1080p sequences, which indicates that the proposed scheme can be useful in reducing the system power through saving DRAM bandwidth.

关键词： Random access memory Encoding Bandwidth Video coding Pulse modulation Video codecs Motion estimation Production systems Pulse compression methods modulation coding

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Performance Parameter of Mobile WiMAX : A Study on the Physical Layer of Mobile WiMAX under Different Communication Channels & modulation Technique

Performance Parameter of Mobile WiMAX : A Study on the Physi...

引用

International Conference on Computer Engineering and Applications (ICCEA)

作者： Omar Arafat K. Dimyati Department of Electrical Engineering University of Malaya Kuala Lumpur Malaysia

ISBN: (纸本)9781424460793;9780769539829

Mobile WiMAX is a broadband wireless solution that enables convergence of mobile and fixed broadband network through a common wide area broadband radio access technology and flexible network *** evaluation of mobile WiMAX under varying channel is one of the convincing research *** of the existing works,based on performance evaluation under channel condition are limited to AWGN,ITU etc in mobile *** this paper we analyses the performance of mobile WiMAX (PHY layer) under SUI channel models in addition under different data rates, coding schemes, modulation technique. The simulation cover important performance parameter like Bit Error Rate, Block Error Rate & Signal to Noise Ratio.

关键词： WiMAX Physical layer Communication channels Mobile computing Bandwidth Bit error rate Sprites (computer) modulation coding Performance analysis Signal to noise ratio

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DVB-S/S2 satellite television broadcasting measurement and comparison

DVB-S/S2 satellite television broadcasting measurement and c...

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International Conference on Radioelektronika

作者： Balázs Lábsky Tomáš Kratochvíl Dept. of Radio Electronics Brno University of Technology Brno Czech Republic

This paper deals with an experimental measurement of real DVB-S and DVB-S2 signal. As a digital satellite signal source were used a 90cm diametric parabolic antenna in top of DREL BUT destined to satellite ASTRA 3A 23,5° East longitude for DVB-S signal and to satellite ASTRA 1E 19,2° East longitude for DVB-S2 signal. Antenna measurement system Kathrein MSK 200 was used as a test receiver for the measurement with a set top box Humax HD 2000-CI. Finally, obtained results are evaluated, compared and commented.

关键词： Satellite broadcasting Digital video broadcasting TV broadcasting Antenna measurements Forward error correction Quadrature phase shift keying modulation coding Satellite antennas Telecommunication standards High definition video

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Joint Design of Channel-Source coding for Compressive Sampling Systems

Joint Design of Channel-Source Coding for Compressive Sampli...

引用

Consumer Communications and Networking Conference, CCNC IEEE

作者： Olusegun O. Odejide Cajetan M. Akujuobi Annamalai Annamalai Gerald Fudge Center of Excellence for Communication System Technology Research CECSTR Prairie View A and M University Prairie View TX USA Integrated systems engineering Division L 3 Communications Greenville TX USA

Compressive sampling (CS) is based on the principle of sampling signals according to their sparsity or compressibility as opposed to the rate specified by the Nyquist/Shannon sampling theorem. Shannon's separation principle of source and channel coding cannot always be used to improve CS reconstruction performance in the presence of noise, including conditions when the channel is time-varying and there is a delay constraint, or when multiple channels are present as in broadcast/multicast applications. In this paper, we propose performing joint design of the source and channel coding to improve noisy CS performance in multicast and time varying channels.

关键词： Sampling methods Signal resolution modulation coding Channel coding Signal sampling Error correction codes Protection Communications Society Communication systems Communications technology

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Monolithically integrated quad Mach-Zehnder IQ modulator for optical 16-QAM generation

Monolithically integrated quad Mach-Zehnder IQ modulator for...

引用

Conference on Lasers and Electro-Optics (CLEO)

作者： Guo-Wei Lu Takahide Sakamoto Akito Chiba Tetsuya Kawanishi Tetsuya Miyazaki Kaoru Higuma Masaaki Sudo Junichiro Ichikawa Chalmers University of Technology Sweden National Institute of Information and Communications Technology (NICT) Sumitomo Osaka Cement Company Limited Japan New Technology Research Laboratories Sumitomo Osaka Cement Company Limited Japan

We experimentally demonstrate a 16-QAM transmitter using a monolithically-integrated quad Mach-Zehnder in-phase/quadrature (QMZ-IQ) modulator with binary driving electronics.

ISBN: (纸本)9781557528896

We experimentally demonstrate a 16-QAM transmitter using a monolithically-integrated quad Mach-Zehnder in-phase/quadrature (QMZ-IQ) modulator with binary driving electronics.

关键词： Optical modulation Integrated optics Optical transmitters Quadrature amplitude modulation Phase modulation Optical receivers Bit error rate modulation coding OFDM modulation Electrodes

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Minimizing the effect of cross phase modulation in WDM optical transmission system

Minimizing the effect of cross phase modulation in WDM optic...

引用

International Conference on Advanced Communication Technology (ICACT)

作者： Kazi Abu Taher S. P. Majumder Department of Computer Science and Engineering Military Institute of Science and Technology and Department of Electrical and Electronic Engineering Bangladesh University of Engineering and Technology Bangladesh

ISBN: (纸本)9781424454273;9788955191455

Multilevel line coding scheme such as Novel optical line code is applied to combat the effect of cross phase modulation in a single segment dispersive optical link. The analysis is carried out for an intensity modulated direct detection WDM system with various linecoding techniques like NRZ and novel optical order-1 code. Results are numerically evaluated in terms of bit error rate and power penalty at a BER of 10 -9 . Results show that there is an improvement in system performance by 1.89 dB in terms of input power.

关键词： Phase modulation Wavelength division multiplexing Optical modulation Bit error rate Dispersion Optical fiber communication Intensity modulation modulation coding Optical signal processing System performance

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Fundamentals of coding and modulation Tutorial at ECOC 2009, Vienna, Austria

Fundamentals of Coding and Modulation Tutorial at ECOC 2009,...

引用

European Conference on Optical Communication (ECOC)

作者： Gerhard Kramer Department of Electrical Engineering-Systems University of Southern California USA

A collection of slides from the author presentation is presented. This paper discusses the fundamentals of channel coding, linear block codes, hard and soft decoding.

关键词： Tutorial modulation coding

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