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检索条件"主题词=Modulation coding"

共 7024 条记录，以下是441-450 订阅

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Performance evaluation of error-correcting scheme without redundancy code for noncoherent chaos communications

Performance evaluation of error-correcting scheme without re...

引用

IEEE International Symposium on Circuits and Systems (ISCAS)

作者： Shintaro Arai Yoshifumi Nishio Takaya Yamazato Shinji Ozawa Aichi Koka Daigaku Gamagori Aichi JP Department of Electrical and Electronic Engineering Tokushima University Tokushima JAPAN EcoTopia Science Institute Nagoya University Nagoya JAPAN Faculty of Engineering Aichi University of Technology Gamagori Aichi JAPAN

This paper considers a novel error-correcting scheme exploiting chaotic dynamics for noncoherent chaos communication. In our proposed system, two successive chaotic sequences are generated from the same chaotic map; the second sequence is generated with an initial value which is the last value of the first sequence. In this case, successive chaotic sequences having the same chaotic dynamics are created. This feature gives the receiver additional information to correctly recover the information data and thus improves the bit error performance of the receiver. Further, enhanced efficiency also comes from operating on successively modulated data; by involving less redundancy in the error correction system, it can be designed with high coding rate. In this paper, we analyze the scheme's capability, by examining computational times and accuracy rates of error correction, bounds on its capability.

关键词： Redundancy Chaotic communication Error correction Transmitters Demodulation modulation coding Error correction codes Computer errors Communication standards Laboratories

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A Differential Cross-Correlation Cell Search Algorithm for IEEE 802.16e OFDMA Systems

A Differential Cross-Correlation Cell Search Algorithm for I...

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IEEE Conference on Vehicular Technology (VTC)

作者： Juinn-Horng Deng Shun-Hsiung Chang Jeng-Kuang Hwang Shu-Min Liao Department of Communications Engineering Yuan-Ze University Chungli Taiwan

ISBN: (纸本)9781424425181;9781424425198

A differential cross-correlation cell ID identification algorithm is proposed for IEEE 802.16e OFDMA cellular system. First, we construct the downlink (DL) preamble structure and signal model with carrier frequency offset (CFO) and channel effects. Next, in order to achieve the initial synchronization, a differential receiver with cross correlation for all preamble patterns is proposed to search cell ID. Simulation results confirm that the proposed structure is suitable for ITU fading channels and outperforms the conventional cell search system.

关键词： OFDM Frequency synchronization Fading WiMAX Downlink Wireless communication Transceivers Fast Fourier transforms modulation coding Electronic mail

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Review of PSK and QAM — Digital modulation techniques on FPGA

Review of PSK and QAM — Digital modulation techniques on FP...

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International Conference on Computational Cybernetics (ICCC)

作者： S. O. Popescu G. Budura A. S. Gontean Applied Electronics Department University Politechnica of Timisoara Timisoara Romania Telecommunications Department University Politechnica of Timisoara Timisoara Romania

ISBN: (纸本)9781424474325;9781424474332

This paper presents an overview of the PSK and QAM modulations, two digital modulation techniques. Based on recent development of software tools and FPGA circuits, the present paper improves a solution for implementing the PSK demodulation technique on a Virtex 5 board. The design of a BPSK detector, all digital, implemented on the FPGA is also considered.

关键词： Phase shift keying Quadrature amplitude modulation Digital modulation Field programmable gate arrays modulation coding Binary phase shift keying Demodulation Phase modulation Signal processing Detectors

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Three Simple Iterative Decoding Schemes for BICM-ID

Three Simple Iterative Decoding Schemes for BICM-ID

引用

International Conference on Biomedical Engineering and Computer Science (ICBECS)

作者： Shuai Zhang Jianping Li Jinlun Chen Sch. of Inf. Eng. Commun. Univ. of China Beijing China

Iterative decoding is an efficient technique to overcome the disadvantage of Bit-Interleaved Coded modulation (BICM) over AWGN channels. In order to reduce the unnecessary iterations of the iterative decoding process, stopping criteria technique has been introduced. Since the iterative process of Bit-Interleaved Coded modulation with Iterative Decoding (BICM-ID) is proceeded between the demapper and the SISO decoder, not as the one of turbo-decoder which is proceeded between two component decoders, the minimum iteration number of BICM-ID is 2 when using conventional stopping criteria iterative schemes. To minimize the overall iteration number of the iterative decoding process and decrease the complexity of BICM-ID receiver, three simple iterative decoding schemes for BICM-ID, called simple CE (S-CE), simple SCR (S-SCR) and simple HDA (S-HDA) respectively, are proposed in this paper. Simulation results show that the proposed schemes perform similar to the corresponding conventional ones and require less complexity, meanwhile, these proposed schemes perform almost the same as the Fixed iteration scheme with much less iterations. A GENIE scheme is included as the limit of all possible stopping criteria.

关键词： Iterative decoding modulation coding Thyristors Interleaved codes AWGN channels Degradation Fading Delay effects Computational complexity Process control

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Iterative demapping and decoding for bit-interleaved coded modulation in optical communication systems

Iterative demapping and decoding for bit-interleaved coded m...

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International Conference on Transparent Optical Networks

作者： T. Lotz W. Sauer-Greff R. Urbansky Communications Engineering Technical University of Kaiserslautern Kaiserslautern Germany

ISBN: (纸本)9781424477999

Considering the growing demand for high-rate data services, the capacity of optical fibers has to be exploited close to its theoretical limit. In addition to techniques mitigating dispersions, coherent detection and polarization multiplexing (PolMUX) as well as forward error correction (FEC) using high-rate block codes are already applied. However, to approach channel capacity, multi-level signaling for high spectral efficiency is mandatory. Orthogonal frequency division multiplexing (OFDM) in combination with multiple-input/multiple-output (MIMO) PolMUX equalization is a straightforward approach to cope with dispersions. Since higher modulation formats like 16-QAM and beyond are increasingly sensitive to noise, additional FEC for optical OFDM, also referred to as coded optical OFDM (CO-OFDM), has to be considered for a bit error rate (BER) -15 In order to achieve a performance close to the capacity limit, we apply an additional high-rate inner code to protect the multi-level signaling scheme, so-called bit-interleaved coded modulation (BICM), in combination with soft demapping and iterative decoding techniques. In this contribution the design principles of a BICM system using iterative demapping and decoding (BICM-ID) and its promising performance will be discussed.

关键词： Iterative decoding Interleaved codes modulation coding Optical modulation Optical fiber communication OFDM Forward error correction Optical noise Optical fiber dispersion Optical sensors

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On efficiency of link adaptation mechanisms in H/ARQ systems

On efficiency of link adaptation mechanisms in H/ARQ systems

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Proceedings of the International Convention MIPRO

作者： Milos Pilipovic Dragan Samardzija Computing and Control Department University of Novi Sad Novi Sad Serbia

In this study we analyze the synergy effects among ARQ and Hybrid ARQ with rate-adaptive mechanisms. We present several coding and decoding schemes and link adaptation techniques for rate-adaptive transmission, designed to combat noise, and we discuss their performance. We describe approaches for searching and selecting the best modulation and coding scheme (MCS) based on channel quality information (CQI). Hybrid ARQ using convolutional and punctured convolutional codes is used with variable re-transmission packet size and code rate according to CQI. Attractive simulation results are issued and they may be used as a basis for performance trade-off.

关键词： Automatic repeat request Decoding Convolutional codes Quality of service Bit error rate AWGN modulation coding Error correction Cyclic redundancy check Forward error correction

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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...

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

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

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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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A methodology for multi-band class E RF PA design

A methodology for multi-band class E RF PA design

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IEEE MTT-S International Microwave Workshop Series (IMWS)

作者： A. Diet M. Villegas G. Baudoin F. Robert UMR 8506 L2S-DR-É Supélec Gif-sur-Yvette France ESYCOM EA 2552 Groupe ESIEE Université Paris-Est Noisy-le-Grand France

ISBN: (纸本)9781424457519;9781424457533

This paper presents a simple methodology for the design of a highly efficient PA in the context of multiradio devices. This PA belongs to the radiofrequency reconfigurable part within a transmitter. Our goal is to improve the PA efficiency over the bandwidth. The method is based on the extraction of the transistor's non-linear output parameters and the optimisation of a given class E topology to an ideal impedance load. Herein, the method is illustrated by an integrated design using between 2 and 4 GHz and the results of the simulations (in terms of efficiency) agree well with the transient simulation and the S-Parameters optimisation. Considerations are given for the complete development of this design and the interest for future multiband front end designs.

关键词： Radio frequency Bandwidth Design methodology modulation coding Pulse width modulation Design optimization Topology Optimization methods Voltage WiMAX

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Cross-layer optimization of rateless coding over wireless fading channels

Cross-layer optimization of rateless coding over wireless fa...

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Biennial Symposium on Communications, QBSC

作者： Yu Cao Steven D. Blostein Department of Electrical and Computer Engineering Queen's University Kingston ONT Canada

ISBN: (纸本)9781424457090;9781424457113

Rateless codes are recently-proposed erasure correction codes. To apply rateless codes over wireless communication channels, a physical-layer forward error correction (FEC) code, such as a convolutional code, is usually used to correct errors within each packet while Raptor codes are used in the application layer to correct erased packets. Traditionally, the physical-layer modulation and coding rate are chosen to guarantee an overall packet error rate to be below a certain level. However, such a choice does not always provide the best overall system performance. This paper proposes a cross-layer scheme to optimize physical layer modulation and coding rate to maximize system throughput. Both slow and fast fading channels are considered. For slow fading channels, cross-layer adaptive modulation and coding schemes are also proposed. Numerical results show that the proposed cross-layer schemes outperform traditional schemes significantly in terms of system throughput. The results also indicate that in many situations, allowing for more packet error correction in the application-layer through erasure codes can be more efficient than ensuring a low packet error rate using a low-rate physical-layer code.

关键词： Fading modulation coding Forward error correction Error correction codes Error analysis Throughput Wireless communication Convolutional codes System performance Physical layer

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