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检索条件"主题词=Modulation Coding"

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Unit for retransmission of satellite radio navigation signals

Unit for retransmission of satellite radio navigation signal...

引用

International Crimean Conference on Microwave & Telecommunication Technology

作者： V.V. Akunets S.P. Ulukov S.L. Truhan V.E. Yaskevich Minsk Research Institute of Radiomaterials Minsk Belarus

The method and device for retransmission of signals of satellite radio navigation systems (SRNS) for remote monitoring of vehicle location are presented. A feature of this device is modulation of the pilot signal by a pseudo random code with identical parameters to the informational one, transmitted from the satellites. It allows us to provide the power balance of the retransmitted informational signal and a pilot signal. Also the use of the reserve SRNS informational channel for the transfer of the pilot signal results in a reduction of the frequency band.

关键词： Satellite broadcasting Radio navigation Frequency Base stations modulation coding Vehicles Remote monitoring Receivers Oscillators Global Positioning System

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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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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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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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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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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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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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A class-coded modulation method using orthogonal wavelets

A class-coded modulation method using orthogonal wavelets

引用

IEEE Conference on Wireless Communications and Networking

作者： E. Okamoto Huan-Bang Li M. Tanaka H. Wakana Communications Research Laboratories Kashima Ibaraki Japan

Researchers have studied two types of digital multi-carrier modulation, wavelet packet modulation (WPM), and fractal modulation. The advantage of WPM is that it allows signal time and frequency to be divided and multiplexed. Therefore the time and frequency of noise signals, e.g., tone and impulse noise, can be identified and effectively partitioned in packets. Using this advantage, we propose a class-coded modulation method for WPM that has good bit error rate (BER) performance when the length of the code constraint is extended and can select time and frequency noise signals simultaneously. This report describes the proposed method and the computer simulations carried out to test its effectiveness.

关键词： Digital modulation Block codes Bit error rate modulation coding Wavelet packets Working environment noise Fractals Frequency conversion Decoding Testing

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An active tagging system using circular polarization modulation

An active tagging system using circular polarization modulat...

引用

Microwave, MTT-S International Symposium

作者： M. Kossel H. Benedickter W. Baechtold Laboratory for Electromagnetic Fields and Microwave Electronics Swiss Federal Institute of Technology Zurich Switzerland

An active read/write microwave tagging system using circular polarization modulation as a novel modulation scheme for RFID systems to reduce demodulation complexity and power consumption on the battery powered tag is presented. Additional coding of the circular polarization modulated data reduces transmission errors due to polarization inversion at multipath propagation.

关键词： Tagging Batteries modulation coding Radio frequency Electromagnetic wave polarization Demodulation Signal processing Decoding Switches Microwave technology

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Iterative decoding of product codes with a priori information over a Gaussian channel for still image transmission

Iterative decoding of product codes with a priori informatio...

引用

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

作者： A. Elbaz R. Ryndiah B. Solaiman O. Ait Sab Department Signal et Communication Technopôle Brest Iroise ENST de Bretagne Brest France IMT Atlantique Bretagne-Pays de Loire Brest Bretagne FR

In this paper we propose an optimized transmission system for still images. This system comprises a VQ source encoder with a compression rate of 9. The source data is encoded using a BCH product code and mapped on a 16-QAM constellation. The codebook and channel encoder have been optimized to minimize distortion in presence of transmission errors. We use a new joint source-channel turbo decoding algorithm of the product code. As compared to classical channel decoding algorithms (soft decoding), we obtain an improvement of 0.7 dB in terms of coding gain for a BER of 10/sup -5/. The PSNR of the received image exhibits an improvement of 11 dB as compared to conventional turbo decoding at low SNRs.

关键词： Iterative decoding Product codes Gaussian channels Books Source coding Channel coding Prototypes Vector quantization Image coding modulation coding

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