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检索条件"主题词=Modulation coding"

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A non-uniform modulation transform for audio coding with increased time resolution

A non-uniform modulation transform for audio coding with inc...

引用

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

作者： J.K. Thompson L.E. Atlas Department of Electrical Engineering University of Washington Seattle WA USA

Perceptual audio coders exploit two properties to achieve coding gain: perceptual irrelevancy and source redundancy. Recently, a two-dimensional modulation transform was introduced which efficiently extracts perceptual irrelevancy and source redundancy not accessible in a one-dimensional transform. In this paper, we propose an alternative modulation transform design with an octave-band non-uniform modulation dimension. This non-uniform modulation dimension approximately mimics the spacing of modulation filter subbands of the human auditory system, while simultaneously increasing the time resolution of the modulation transform providing improved temporal control of coding noise.

关键词： modulation coding Audio coding Filter bank Frequency estimation Humans Time frequency analysis Auditory system Signal resolution Wavelet transforms Frequency modulation

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A rateless coding and modulation scheme for unknown Gaussian channels

A rateless coding and modulation scheme for unknown Gaussian...

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Canadian Workshop on Information Theory (CWIT)

作者： Jeff Castura Yongyi Mao SITE University of Ottawa Ottawa Canada

We consider the problem of reliable transmission of information over unknown AWGN channels using rateless codes and non-uniform modulation techniques. We show that Raptor codes and a form of non-uniform, high-order modulation allow for reliable communication at low SNR, with the ability to automatically adapt rate as the SNR increases. Simulation results are presented showing throughput performance and design parameter tradeoffs.

关键词： modulation coding Gaussian channels AWGN channels Demodulation Transmitters Propagation losses Decoding Channel capacity Throughput Fading

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Distributed Video coding of Wyner-Ziv Frames using Trellis Coded modulation

Distributed Video Coding of Wyner-Ziv Frames using Trellis C...

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Canadian Conference on Electrical and Computer Engineering (CCECE)

作者： W.A.R.J. Weerakkody W.A.C. Fernando A.B.B. Adikari School of Engineering Design Brunei University Uxbridge UK

Distributed video coding (DVC) is known as an emerging video coding technique, which primarily has a modified complexity balance in the encoder and decoder, in contrast to its traditional competitors. In DVC, we have a very simple low cost encoder which is an ideal feature for applications involving a large number of video capturing points located remotely and a centralized shared decoder. In this paper, we introduce a novel approach for DVC, using turbo trellis coded modulation (TTCM) to generate the parity information at the encoder to be sent over the channel and then to decode the parity with the side information at the decoder. The side information is generated using key frames passed to the decoder by the use of a pixel interpolation technique. TCM symbols are formed using the side information and the parity bit stream which are fed to the TTCM decoder. The decoded output is used to reconstruct the final video sequence. The results are compared with a turbo coding based DVC and it is evident that the proposed method outperforms its turbo code based counterpart by a significant margin

关键词： Video coding modulation coding Decoding Design engineering Costs Streaming media Video sequences Turbo codes Videoconference Interpolation

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Speech transmission using DPCM coding, partial response continuous phase modulation and diversity

Speech transmission using DPCM coding, partial response cont...

引用

IEEE Conference on Vehicular Technology (VTC)

作者： V. Varma S.C. Gupta Electrical Engineering Department Southern Methodist University Dallas TX USA

This paper considers the performance of a speech transmission scheme with application to cellular digital mobile radio systems. The source coder is embedded DPCM and modulation scheme belongs to a class of Partial Response Continuous Phase modulation Both quantizing noise and transmission errors contribute to the overall mean squared error. The performance measure is audio signal to noise ratio. It is seen that in a fading environment space diversity is very effective in bringing down the threshold of channel signal to noise ratio to maintain the required audio signal to noise ratio. The number of channels the system can support is evaluated under various conditions.

关键词： Speech coding Continuous phase modulation Land mobile radio Fading Receivers Amplitude modulation Signal to noise ratio Bandwidth Frequency modulation coding

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On combined spectral shaping coding and M-FSK modulation for power line communications

On combined spectral shaping coding and M-FSK modulation for...

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IEEE International Symposium on Power Line Communications and Its Applications (ISPLC)

作者： K. Ouahada H.C. Ferreira Ling Cheng A.J.H. Vinck Department of Electrical and Electronic Engineering University of Johannesburg Auckland Park South Africa Institute for Experimental Mathematics University of Essen Essen Germany

Three models of codes generating higher order spectral nulls are presented. New codes are developed applying either the power spectrum density formula, or the distance increasing mappings (DIM) or the modified generat... 详细信息

关键词： modulation coding Power line communications Frequency Background noise Additive white noise Gaussian noise Noise robustness Electromagnetic compatibility Interference Bandwidth

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Noncoherent physical-layer network coding using binary CPFSK modulation

Noncoherent physical-layer network coding using binary CPFSK...

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MILCOM, Military Communications Conference

作者： Matthew C. Valenti Don Torrieri Terry Ferrett West Virginia University Morgantown WV USA U.S. Army Research Laboratory Adelphi MD USA

ISBN: (纸本)9781424452385

Physical-layer network coding is a high-throughput technique for communicating over the two-way relay channel, which consists of two terminals that communicate exclusively via an intermediate relay. An exchange of messages begins with both terminals transmitting binary data sequences simultaneously to the relay. The relay determines the modulo-2 sum of the sequences, which it modulates and broadcasts to the terminals. Since each terminal knows the information it transmitted, it can determine the information transmitted by the other terminal by subtracting its own information from the broadcast signal. Prior work on the topic of physical-layer network coding has assumed that the signals transmitted by the two terminals arrive at the relay with perfectly aligned phases, permitting coherent reception. In this paper, we relax the assumption of aligned phases and consider noncoherent reception of binary continuous-phase frequency-shift keying signals. A derivation of the relay receiver is given for varying amounts of channel state information, and results are provided showing the error performance of the proposed system without an outer error-correcting code and with an outer turbo code.

关键词： Network coding modulation coding Relays Broadcasting Time division multiple access Throughput Decoding Demodulation Laboratories Frequency shift keying

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Adaptive coding and modulation in MIMO OFDMA systems

Adaptive coding and modulation in MIMO OFDMA systems

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IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC)

作者： Stephan Stiglmayr Johannes Klotz Martin Bossert Institute of Telecommunications and Applied Information Theory DIm University Ulm Germany

Adaptive coding and modulation are well known techniques for enhancing the performance of systems transmitting over quasi-static fading channels. Especially their application in OFDM based systems promises gains in spectral efficiency. In former work we presented an efficient method for the joint optimization of code rate and modulation formats if rate-compatible punctured codewords are mapped onto sub-symbols with heterogeneous channel quality and modulation formats. In this paper, we demonstrate the application of our scheme to MIMO techniques. More specifically, we investigate non-orthogonal spatial multiplexing schemes in bit-interleaved coded OFDM systems. The techniques are evaluated within the context of the OFDMA/TDMA system designed within the EU FP6 Integrated Project WINNER.

关键词： Adaptive coding modulation coding MIMO Forward error correction Fading OFDM modulation Bit error rate Parity check codes Signal to noise ratio Proposals

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Performance analysis of energy efficient asymmetric coding and modulation schemes for Wireless Sensor Networks

Performance analysis of energy efficient asymmetric coding a...

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International Symposium on Wireless Pervasive Computing (ISWPC)

作者： Govinda M. Kamath Yogesh Shekar G. Abhijith Kini U. Sripati Muralidhar Kulkarni Department of Electronics & Communication Engineering National Institute of Technology Karnataka India

Wireless Sensor Networks generally operate under severe energy constraints. In many cases, the networks are star connected with battery-powered nodes sensing data and sending it to a centrally-powered base station, whose energy constraints are more fore-bearing than that of the nodes. In this paper, an approach for energy efficient communication by using different channel codes on the base-station to node link (downlink) and node to base-station link (uplink) is proposed and analysed for such a network topology. This is in effect shifting complexity from the node to the base station while continuing to have the same BER performance. Also the use of more energy efficient modulation schemes are explored.

关键词： Performance analysis Energy efficiency modulation coding Wireless sensor networks Base stations Decoding Energy consumption Downlink Frequency shift keying Equations

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4-dimensional PSK trellis coding scheme using M-ary orthogonal modulation with a frequency-reuse technique

4-dimensional PSK trellis coding scheme using M-ary orthogon...

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International Conference on Universal Personal Communications

作者： Hae Geun Kim Electronics and Telecommunications Research Institute Taejon South Korea

ISBN: (纸本)0780337778

The 16 and 32-state trellis-coded M-ary 4-dimensional (4-D) orthogonal modulation schemes with a frequency-reuse technique have been investigated. Here, 5 coded bits from a rate 4/5 convolutional encoder provide 32 possible symbols. Then the signals are mapped by a M-ary 4-D orthogonal modulator, where each signal has equal energy and is PSK modulated. In the M-ary 4-D modulator, we have employed the vectors which are derived by the optimization technique of signal waveforms (OSW) in a 4-D sphere. This technique is used in maximizing the minimum Euclidean distance between a set of signal points on a multidimensional sphere. By combining trellis coding with M-ary 4-D modulation and proper set-partitioning, we have obtained a considerable improvement in the free minimum distance of the system over an AWGN channel. The 16-state scheme obtains coding gains up to 5.5 dB over the uncoded two-independent QPSK scheme and 2.5 dB over the two-independent 2-D TCM scheme. And, the 32-state scheme obtains coding gains up to 6.4 dB over the uncoded two-independent QPSK scheme and 3.4 dB over the two-independent 2-D TCM scheme.

关键词： Phase shift keying Frequency modulation modulation coding Amplitude modulation Digital modulation Bandwidth Signal generators Error probability Convolution Error analysis

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Fine-granularity loading schemes using adaptive Reed-Solomon coding for discrete multitone modulation systems

Fine-granularity loading schemes using adaptive Reed-Solomon...

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IEEE International Conference on Communications (ICC)

作者： S. Panigrahi Tho Le-Ngoc Department of Electrical and Computer Engineering McGill University Montreal QUE Canada

In this paper, we present a fine granularity loading scheme using joint optimization of modulation and coding for discrete multitone (DMT) modulation towards achieving maximum information rate conveyed. While most existing algorithms strived for the optimal energy distribution to maximize rate, the bits loaded were always constrained to integers. It was initially believed that most (not all) of the granularity losses could be recovered through 'bit-rounding' and 'energy re-scaling' after an optimal 'water-filling' approach. But this was observed only for the total power constrained case. With the advent of peak power constraint, we show that the room for optimization in the energy domain severely constrained and granularity losses constitute a significant percentage of the achievable data rate. To recover these losses, we propose a loading scheme that integrates the coding scheme with the bit-loading algorithm. For achieving near-continuous rate adaptation, the family of Reed-Solomon (RS) codes has been used for their low redundancy, high flexibility in correction capability and highly programmable architecture. Simulation results with very high bit rate digital subscriber line (VDSL)-DMT system show more than 20% improvement in most cases.

关键词： Reed-Solomon codes OFDM modulation modulation coding Information rates Bit rate DSL Error probability Constraint optimization Standardization Telecommunication standards

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