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检索条件"主题词=Modulation coding"

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Performance comparison of ATSC 8-VSB and DVB-T COFDM transmission systems for digital television terrestrial broadcasting

Performance comparison of ATSC 8-VSB and DVB-T COFDM transmi...

引用

IEEE International Conference on Consumer Electronics (ICCE)

作者： Y. Wu Communications Rcscarch Centre Ottawa Canada

This paper compares the performances of ATSC 8-VSB and DVB-T COFDM transmission systems for digital television terrestrial broadcasting. The comparison is based on laboratory test results. The methodologies used for t... 详细信息

关键词： Digital video broadcasting Digital TV TV broadcasting Transmitters Laboratories Digital modulation Additive white noise AWGN Testing modulation coding

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Comparative study of turbo equalisers using convolutional codes and block-based turbo codes for GMSK modulation

Comparative study of turbo equalisers using convolutional co...

引用

IEEE Conference on Vehicular Technology (VTC)

作者： B.L. Yeap T.H. Liew J. Hamorsky L. Hanzo Department of Electr. and Computer Se. University of Southampton UK University of Southampton Southampton Hampshire GB

In contrast to previously proposed turbo equalisers, where typically non-iterative channel decoders were used, this paper compares the performance of partial-response GMSK turbo equalisers using two different encoders, namely block BCH turbo codes and convolutional codes. The BER performance is assessed over non-dispersive Gaussian channels, and dispersive Rayleigh fading channels.

关键词： Equalizers Convolutional codes Turbo codes Iterative decoding Neodymium GSM modulation coding Bit error rate Gaussian channels Dispersion

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Differential 8-PSK code with multisymbol interleaving

Differential 8-PSK code with multisymbol interleaving

引用

International Conference on Telecommunications in Modern Satellite, Cable and Broadcasting Service (TELSIKS)

作者： S. Dordevic Mihajlo Pupin Institut Beograd Serbia

Conventional differential systems are known to have poor performance when used in a Rice- or Rayleigh-fading channel. These systems are incapable of working properly due to time changing channel parameters. This difficulty is overcome by using multiple symbol differential detection (MSDD). This paper deals with one simplification of these systems.

关键词： Interleaved codes Decoding Fading Phase shift keying Rayleigh channels AWGN Filtering Viterbi algorithm Convolutional codes modulation coding

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New spread spectrum techniques for multiple antenna transmit diversity

New spread spectrum techniques for multiple antenna transmit...

引用

Seamless Interconnection for Universal Services. Global Telecommunications Conference. GLOBECOM'99. (Cat. No.99CH37042)

作者： D. Rajan E. Erkip B. Aazhang Department of Electrical and Computer Engineering Rice University Houston TX USA

We propose a new scheme for multiple antenna transmission in the context of spread spectrum signaling. The new scheme consists of using shifted Gold sequences to modulate independent information on the multiple antennas. We show that this new scheme greatly improves the throughput over currently known multiple antenna methods. We also find the optimal power allocation strategy among multiple transmit antennas for a fixed feedback rate.

关键词： Spread spectrum communication Transmitting antennas Gold Receiving antennas Throughput Antenna feeds modulation coding Fading Feedback Downlink

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A theoretical model for time code modulation

A theoretical model for time code modulation

引用

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

作者： D. Kalogiros V. Stylianakis Wire Communications Laboratory Department of Electrical and Computer Engineering University of Patras Greece

The traditional waveform coding techniques for digital communication systems convert the original analog input signal into a digital bit stream using uniform sampling in the time domain, i.e. PCM, DM, ADPCM. We propose the time code modulation (TCM) technique as an alternative coding scheme, where information is extracted from the signal, only at the time instants when necessary. This results in a variable sampling rate, where its mean value is significantly less than the Nyquist rate. In addition we suggest a general theoretical model for TCM and we present simulation results for various implementations of TCM coders and decoders. A theoretical estimation of SNR vs. sampling rate performance is also presented.

关键词： modulation coding Sampling methods Frequency Speech Decoding Wire Laboratories Digital communication Phase change materials Delta modulation

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Noncoherent trellis coded amplitude-phase modulation

Noncoherent trellis coded amplitude-phase modulation

引用

Seamless Interconnection for Universal Services. Global Telecommunications Conference. GLOBECOM'99. (Cat. No.99CH37042)

作者： A. Ben-Zur D. Raphaeli ECI Telecom Limited Israel The department of Electrical Engineering-Systems Tel-Aviv University Tel-Aviv Israel

The novel noncoherent coded modulation (NCM) scheme introduced by Raphaeli (see IEEE Trans. Commun., vol.44, no.2, p.172-83, 1996) is extended for non-constant energy symbols. Theoretical performance analysis, based on deriving the pairwise error distribution over an additive white Gaussian noise (AWGN) channel applying the independent overlapped observations noncoherent maximum likelihood sequence estimation (IO-NMLSE) metric is presented. Tight Gaussian approximation together with upper and lower bounds and a method for numerically evaluate them are presented. The NCM scheme has a performance that approaches that of a coherent detection for increasing complexity. Sub-optimal decoding algorithms introduced by Raphaeli (see IEEE Trans. Commun., vol.44, no.3, p.312-23, 1996), provide good tradeoff between maximizing performance and minimizing system complexity.

关键词： Amplitude modulation modulation coding Quadrature amplitude modulation AWGN Maximum likelihood detection Maximum likelihood estimation Phase detection Phase estimation Bandwidth Error probability

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Turbo-equalization applied to trellis-coded-modulations

Turbo-equalization applied to trellis-coded-modulations

引用

IEEE Conference on Vehicular Technology (VTC)

作者： P. Magniez P. Duhamel A. Roumy I. Fijalkow TSI-ENST Paris France Equipe de Traitement des Images et du Signal ETIS/ENSEA Cergy-Pontoise France

In this article, a turbo-equalizer for TCM is investigated. The receiver is composed of a symbol detector or an equalizer realizing soft-output equalization, a deinterleaver, a soft-input soft-output channel decoder based on the a posteriori probability (APP) algorithm. A soft information provided by the decoder is then available and is re-used in the equalization step as is done in the classical scheme of turbo-equalization. The case of a APP algorithm used as an equalizer is investigated. A specific computation, iterating probabilities rather than extrinsic information, allows the application of turbo equalization to TCM. Simulations of this iterative receiver are done.

关键词： Iterative decoding Detectors Equalizers Iterative algorithms Frequency Intersymbol interference Viterbi algorithm Convolutional codes AWGN modulation coding

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Convolutional spectral shaping

Convolutional spectral shaping

引用

IEEE International Conference on Communications (ICC)

作者： Daeyoung Kim V. Eyuboglu Internet and Networking Group Motorola Mansfield MA USA

A new spectral shaping technique Convolutional Spectral Shaping (CSS), is introduced. In CSS, equivalence classes of possible sign bit sequences are represented by a coset of a convolutional code and a search through the trellis of the code is used to pick a sequence from the selected coset to approximate a target spectral shape for transmission. Simulation results are included to illustrate the performance of CSS. A version of CSS has recently been adopted by the International Telecommunication Union (ITU) in the Pulse Code modulation (PCM) modem standard V.90.

关键词： Phase change materials Cascading style sheets Modems Convolutional codes Pulse modulation Convolution Spectral shape Filters modulation coding Telecommunication standards

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Accurate formulas and new close bounds to error probability for classical two-dimensional PSK and QASK signal constellations

Accurate formulas and new close bounds to error probability ...

引用

IEEE International Symposium on Electromagnetic Compatibility (EMC)

作者： D.L. Burachenko N.V. Savischenko Military telecommunication academy Saint Petersburg Russia

Accurate formulas and also close, strict upper and lower bounds of error probabilities in a symbol and a bit for classical M-ary two-dimensional signals with PSK, QASK and a manipulation Gray code for any required M are obtained. In order to obtain bounds the sequence of new strict and close inequalities for the Owen function, coming into many accurate formulas of error probability, was defined.

关键词： Error probability Phase shift keying Reflective binary codes Constellation diagram Military communication Telecommunications Additive white noise Frequency modulation coding Decoding

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A rate 16/17 punctured MTR block code

A rate 16/17 punctured MTR block code

引用

IEEE International Conference on Communications (ICC)

作者： P.M. Aziz N. Sayiner V. Annampedu Lucent Technologies Bell Laboratories Allentown PA USA

This paper presents a rate 16/17 "punctured" time varying maximum transition run (PMTR) block code. It is not possible to achieve a rate 16/17 or higher TMTR block code which completely suppresses the minimum distance error event. However, it is in general, possible to make a tradeoff between obtaining higher code rates and coding gain by puncturing; the space of codewords and limiting the extent to which the minimum distance error event is suppressed. As an example, we obtain a rate 16/17 block code where the minimum distance error event is supported in only 6 out of the 17 possible codeword locations. An implementation of the code is presented and simulation results examining the performance benefits under different conditions are also presented.

关键词： Block codes Viterbi algorithm Detectors Laboratories Magnetic modulators modulation coding Magnetic recording Timing Gain Bandwidth

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