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检索条件"主题词=Modulation Coding"

共 7216 条记录，以下是481-490 订阅

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BICM Transmission Using Non-Uniform QAM Constellations: Performance Analysis and Design

BICM Transmission Using Non-Uniform QAM Constellations: Perf...

引用

IEEE International Conference on Communications (ICC)

作者： J. Hossain A. Alvarado L. Szczecinski INRS-EMT University of Quebec Montreal Canada Department of Signals and Systems Communication Systems Group Chalmers University of Technology Gothenburg Sweden

In this paper we study bit-interleaved coded modulation (BICM) transmission using non-uniform (NU) quadrature amplitude modulation (QAM) constellations. For such a NUQAM-BICM transmission, we develop closed-form approximations for the probability density function of the L-values, and we use them to predict the coded bit error rate (BER)performance of the system in the AWGN channel. We then numerically optimize NU-QAM-BICM based on convolutional codes. Compared to uniform QAM-based BICM transmission, and for a target BER of 10 -7 , we reach gains up to 1 dB. When the design is applied to turbo codes a decrease in the error floor can be obtained.

关键词： Quadrature amplitude modulation Performance analysis Bit error rate Interleaved codes Amplitude modulation modulation coding Probability density function AWGN channels Convolutional codes Turbo codes

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Structurally regular integer discrete cosine transform for low-bit-word-length coefficients

Structurally regular integer discrete cosine transform for l...

引用

IEEE International Symposium on Circuits and Systems (ISCAS)

作者： Taizo Suzuki Masaaki Ikehara Department of Electronics and Electrical Engineering Keio University Yokohama Kanagawa Japan

This paper presents an IntDCT with only dyadic values such as k/2 n (k, n ∈ N). Although some IntDCTs have been proposed, they are unsuitable for lossless-to-lossy image coding in low-bit-word-length (coefficients). First, the proposed M-channel lossless WHT (LWHT) can be constructed by only (log 2 M)-bit-word-length and has structural regularity. Then, our 8-channel IntDCT keeps good coding performance even In low-bit-word-length because LWHT, which is main part of IntDCT, can be implemented by 3-bit-word-length. Finally, our method is validated In lossless-to-lossy image coding.

关键词： Discrete cosine transforms Image coding Transform coding Discrete transforms Pulse modulation modulation coding Internet Two dimensional displays Costs Lattices

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Error-Rate Approximations for Bit-Interleaved Coded modulation: A Flexible Analytical Approach

Error-Rate Approximations for Bit-Interleaved Coded Modulati...

引用

IEEE International Conference on Communications (ICC)

作者： A. Kenarsari-Anhari L. Lampe University of British Columbia Vancouver BC Canada

Bit-interleaved coded modulation (BICM) has established itself as the prevalent coded modulation scheme for wireless communication systems. There are a number of semi-analytical approaches for BICM performance analysis, all of which have limitations in terms of applicability and/or complexity. In this paper, we present a novel analytical approach to approximate the bit error rate (BER) of BICM. Our approach is unified in the sense that a (i) large class of fading channels, (ii) arbitrary labeling rules, and (iii) all common signal constellations are encompassed, and it is preferable over previous work in that we provide closed-form expressions. We also derive expressions for the asymptotic BER, which reveals the diversity order and coding gain of BICM transmission over fading channels. The accuracy of proposed analytical approximations is validated through comparison with selective simulation results.

关键词： Interleaved codes modulation coding Bit error rate Fading Wireless communication Performance analysis Labeling Constellation diagram Closed-form solution Analytical models

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166 Gb/s PDM-NRZ-DPSK modulation using thin-LiNb03-substrate modulator

166 Gb/s PDM-NRZ-DPSK modulation using thin-LiNb03-substrate...

引用

Optical Fiber Communication (OFC) Conference

作者： Atsushi Kanno Takahide Sakamoto Akito Chiba Tetsuya Kawanishi Kaoru Higuma Masaaki Sudo Junichiro Ichikawa National Institute of Information and Communications Technology Koganei Tokyo Japan New Technology Research Laboratories Sumitomo Osaka Cement Company Limited Funabashi Chiba Japan

The modulation of a 166-Gb/s PDM-NRZ-DPSK signal is demonstrated using a thin-LiNbO 3 -substrate modulator. The use of a 0.1-mm-thick substrate and a ridge-type waveguide improves the optical response and brings about... 详细信息

关键词： High speed optical techniques Optical modulation Wavelength division multiplexing Optical waveguides Frequency response Electrodes Bandwidth Propagation losses Phase modulation modulation coding

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Asymptotic BER bounds of BICM-ID based cooperative network over Nakagami-m fading channels

Asymptotic BER bounds of BICM-ID based cooperative network o...

引用

Biennial Symposium on Communications, QBSC

作者： Shujaat Ali Khan Tanoli Imran Khan Nandana Rajatheva Telecommunications Asian Institute of Technology Pathum Thani Thailand

ISBN: (纸本)9781424457090;9781424457113

The performance of bit-interleaved coded modulation-iterative decoding (BICM-ID) based cooperative network is analyzed over Rayleigh and Nakagami-m fading channels. The relays are assumed to be operating in amplify-and-forward (AF) configuration. The bit error rate (BER) bounds of single-relay cooperative system with the serial concatenated BICM-ID using the 8-PSK modulations with maximal ratio combining (MRC) at the destination is obtained. For the numerical results of the union bound on BER, moment generating function (MGF) based approach is used and the closed-form MGF expression of the branch metric is derived. The comparisons of theoretical and simulation results are also shown.

关键词： Bit error rate Fading Interleaved codes modulation coding Decoding Performance analysis Relays Cooperative systems Concatenated codes Diversity reception

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Content Dependent Data Hiding on GSM Full Rate Encoded Speech

Content Dependent Data Hiding on GSM Full Rate Encoded Speec...

引用

International Conference on Signal Acquisition and Processing, ICSAP

作者： A. Shahbazi E. Soltanmohammadi A.H. Rezaei A. Sayadiyan S. Mosayyebpour Department of Electrical Engineering Amirkabir University of Technology Tehran Tehran Iran Amirkabir University of Technology Tehran Tehran IR

ISBN: (纸本)9781424457243;9780769539607

This paper introduces a steganographic approach to embed data on compressed speech bit stream in order to hide secret data. This method may be used by any kind of encoded bit stream, but this research concentrates on full rate (GSM 6.10) encoded bit stream. This method allows user to adjust embedded data bit-rate or speech quality. Speech quality is determined by Perceptual Evaluation of Speech Quality (PESQ) which is an objective testing. The effect of embedding data to each specific bit of GSM Full Rate coefficients, on speech quality has been investigated and the less important bits are selected to embed secret data. Meanwhile for approaching a higher speech quality, the data embedding positions are based on different speech frame types. In other words the proposed technique is modified to achieve a content dependent algorithm.

关键词： Data encapsulation GSM Modems Data communication Ground penetrating radar Speech codecs Throughput Bit error rate Algorithm design and analysis modulation coding

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Repetitive Fixed Bandwidth Limitation and QAM Correction for EER Power Amplifier

Repetitive Fixed Bandwidth Limitation and QAM Correction for...

引用

IEEE Conference on Wireless Communications and Networking

作者： Abdul K. Mustafa Michael Faulkner Centre for Telecommunication and Microelectronics Victoria University Australia

Envelope elimination and restoration (EER) power amplifier architecture can achieve high efficiency and linearity. However, when used with modern modulation schemes such as orthogonal frequency division multiplexing (OFDM) and wideband code division multiple access (W-CDMA), it suffers from expanded bandwidth problem. This paper shows that, the straightforward bandwidth limitation results in poor efficiency of the power amplifier (PA). We propose a new repetitive bandwidth limitation technique which reduces bandwidth expansion of both the envelope and phase polar drive signals without compromising the efficiency of the PA. It has been found that the improvement in bandwidth of drive signals is proportional to the number of repetition. The bandwidth limitation often results in spectral splatter and error vector magnitude (EVM). To counter this, we employ a QAM correction technique which reduces the in band distortion.

关键词： Bandwidth Quadrature amplitude modulation Power amplifiers Broadband amplifiers Multiaccess communication High power amplifiers Linearity modulation coding OFDM modulation Wideband

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A Combined MAC and Physical Resource Allocation Mechanism in IEEE 802.16e Networks

A Combined MAC and Physical Resource Allocation Mechanism in...

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IEEE Conference on Vehicular Technology (VTC)

作者： Sondes Khemiri Guy Pujolle Khaled Boussetta Nadjib Achir LIP6-University of Paris 6 Paris France L2TI-Institut Galilée University Paris Sud XIII Villetaneuse France

This paper addresses the issue of wireless resource allocation of a Mobile WiMAX cell based on OFDMA access technique. We compare two strategies: the MAX SNR which is the most used channel assignment technique and our proposal which is based on channel condition learning. As we distinguish four IEEE 802.16e-2005 service classes: UGS, rtPS, nrtPS and ErtPS, we combine these strategies with a scheduler block in order to satisfy the QoS constraints of these classes. In addition, we take into consideration the Adaptive modulation and coding (AMC) scheme, through the selection of the slot which is based on the modulation scheme. The main concern here is to propose a simple method to assign WiMAX physical resources called slot to satisfy QoS constraints of a user's scheduled MPDUs, which can be easily and efficiently used in a realistic Mobile WiMAX network.

关键词： Resource management WiMAX OFDM Quality of service modulation coding Frequency diversity Physical layer Downlink Streaming media Proposals

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Turbo-trellis coded modulation under channel estimation inaccuracies

Turbo-trellis coded modulation under channel estimation inac...

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Iranian Conference on Electrical Engineering (ICEE)

作者： Mohammad Modarresi Seyed Mohammad-Sajad Sadough Department of Electrical Engineering Shahid Beheshti University Tehran Iran

ISBN: (纸本)9781424467600

Turbo-trellis coded modulation (TTCM) schemes are designed for reliable transmission over quasi-static fading channels. Assuming pilot-assisted channel estimation, practical limitations in power and the number of pilots lead to imperfect channel estimates. A general method for robust receiver design under channel estimation errors was recently proposed by Sadough and Duhamel. In this paper, this technique is applied to improve the TTCM reception performance under channel estimation errors. We compare our proposed reception method to conventional receivers (also called mismatched receivers) in terms of bit error rate and EXIT chart analysis. Our results confirm the adequacy of the proposed receiver for improving TTCM iterative decoding performance under channel estimation errors.

关键词： modulation coding Channel estimation Fading Bit error rate OFDM Iterative decoding Robustness Additive white noise AWGN Turbo codes

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Common Information Multicast with Different Data Rates

Common Information Multicast with Different Data Rates

引用

IEEE Conference on Vehicular Technology (VTC)

作者： Yuli Yang Sonia Aissa Physical Sciences and Engineering Division King Abdullah University for Science and Technology Thuwal Saudi Arabia INRS-EMT University of Quebec Montreal QUE Canada

The task of multicast is to deliver common information to all users in a group. However, these users' different channel qualities result in their decoding capabilities being different. Therefore, the multicast design faces a dilemma to convey common information in terms of different decoding capabilities. Motivated by this, a multicast transmission scheme is proposed in this paper. In the proposed scheme, the base station transmitter prescribes the modulation and coding scheme to be used, considering the difference between the better channel-case and worse channel-case users' decoding capabilities, and the adaptive hierarchical modulation promises that each users can process the received signals according to his own decoding capabilities. Compared to the traditional multicast transmission with fixed data rate, the numerical results prove the efficiency of the proposed scheme in exploiting the users' decoding capabilities.

关键词： Decoding Channel coding modulation coding Performance analysis Bit error rate Base stations Algorithm design and analysis Information analysis Demodulation Data engineering

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