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检索条件"主题词=Convolutional coding"

共 225 条记录，以下是161-170 订阅

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Performance of convolutional Coded OOK IM/DD Systems Over Strong Turbulence Channels

Performance of Convolutional Coded OOK IM/DD Systems Over St...

引用

International Conference on Computing, Networking and Communications (ICNC)

作者： Yang, Luanxia Cheng, Julian Holzman, Jonathan F. Univ British Columbia Sch Engn Fac Sci Appl Kelowna BC V1V 1V7 Canada

ISBN: (纸本)9781467300094;9781467352871

A convolutional coded on-off keying optical wireless system using intensity modulation and direct detection is studied for strong turbulence channels. We introduce a series expansion approach to derive a closed-form series expression for the pairwise error probability, and to simplify the union upper bound on the average bit-error rate.

关键词： Strong atmospheric turbulence free-space optical communication convolutional coding

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Design and Performance Analysis of FEC schemes in OFDM Communication System 1

Design and Performance Analysis of FEC schemes in OFDM Commu...

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IEEE International Conference on Recent Trends in Electronics, Information and Communication Technology (RTEICT)

作者： Pooja, K. S. Rajatha, B. R. Sadhvika, G. B. Premananda, B. S. RV Coll Engn Dept Telecommun Engn Bengaluru 560059 India

ISBN: (纸本)9781509007745

Orthogonal Frequency Division Multiplexing (OFDM) is a method of encoding digital data on multiple carrier frequencies. It has become a prevalent technique for wideband digital communication. Forward Error Correction (FEC) schemes for OFDM communication system is presented in this paper. Interleaver is a vital part in the communication system design. Matrix interleaver implementation which significantly improves the Bit Error Rate (BER) performance over other interleaver designs is proposed. Simulation and analysis of OFDM communication system is carried out with reference to IEEE 802.16 WiMAX standard. Four FEC schemes were developed from the combinations of convolutional encoding and interleaving. The BER performance analysis and comparison of four different FEC schemes are obtained. Among them, the single convolutional coding and dual interleaving performs the best under all ranges of Signal to Noise Ratio (SNR).

关键词： BER convolutional coding FEC Matrix Interleaver OFDM SNR WiMAX

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Estimation of the Noise Immunity of Troposphere Communication Systems with OFDM Signals and Available Ways to Increase Ones Bit Error Ratio

Estimation of the Noise Immunity of Troposphere Communicatio...

引用

Science and Information Conference (SAI)

作者： Rychkov, Eugene Patyukov, Victor Siberian Fed Univ Inst Engn Phys & Radio Elect Krasnoyarsk Russia

ISBN: (纸本)9781479985470

Research results are shown and noise immunity estimation is done for based on OFDM technolo*, tropospheric systems, with usage of the noise immunity of classical OFDM systems for mobile application. A modeling in MATLAB and LabVIEW PXI and an experimental test with error probability evaluation are performed. Investigation possibilities to tropospheric OFDM systems are estimated and proposed. System modules possible.

关键词： Noise immunity OM OFDM tropospheric inhomogeneity Rayleigh fading lognormal distribution convolutional coding PA PR frequency offset Doppler shift: weight function LabVIEW PXI FPGA XILINX Radiosvyaz MATLAB model WiEl 802.1.1a quasi-Rayleigh .BPSK QPSK 16-QAM convolutional coding PAPR reduction Guard Interval image transmission distortions zero-subcarriers pilots 5 Gllz

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Performance Limitations due to Timing Synchronization Error on a Space-Time-Coded OFDM Wireless Communication System

Performance Limitations due to Timing Synchronization Error ...

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International Symposium on High Capacity Optical Networks and Enabling Technologies

作者： Mondal, M. R. H. Majumder, S. P. Bangladesh Univ Engn & Technol Inst Informat & Commun Technol Dhaka 1000 Bangladesh Bangladesh Univ Engn & Technol Dept Elect & Elect Engn Dhaka 1000 Bangladesh

ISBN: (纸本)9781424418282

An analytical approach is presented to determine the impact of time selective fading, tinting jitter and AWGN on a STBC-OFDM system with DQPSK, DPSK and QPSK modulation schemes. The BER performance results are evaluated for different values of fading and jitter variance in presence of single and multiple receiving antennas. The computed results show that the DPSK and QPSK systems suffer higher amount of power penalty than DQPSK system due to the jitter effect. Performance improvement due to application of convolution coding is also reported.

关键词： convolutional coding intersymbol interference MIMO OFDM Rayleigh fading STBC timing jitter

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Performance of Only-Phase Equalization in OFDM with Soft Decoding in Indoor Environment

Performance of Only-Phase Equalization in OFDM with Soft Dec...

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IEEE GLOBECOM Workshops (GC Wkshps)

作者： Obiedat, Esam A. Asir, Bassam R. Khalaf, Loay D. Jordan Univ Sci & Technol Irbid Jordan Univ Jordan Amman Jordan

ISBN: (纸本)9781467300407

In this paper, we investigate the performance of frequency domain equalization in conjunction with Soft Decision (SD) Viterbi decoding in the Orthogonal Frequency Division Multiplexing (OFDM) systems. Specifically, we compare the performance of two frequency domain equalization methods, one using complete phase and magnitude equalization of complex Quadrature Amplitude Modulated (QAM) symbols, while the other using only-phase equalization, or constellation rotation. Our investigation shows that the OFDM system using only-phase equalization in conjunction with soft decision decoding for convolutional codes has a better performance of about 2.5-4 dB in multipath environment than the system implementing complete equalization with the same soft decision decoding at 10(-4) BER level.

关键词： phase equalization Equalization soft-decision decoding Frequency domain equalization indoor environment convolutional coding

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Optimal channel code parameter selection for hardware efficient OFDM systems

Optimal channel code parameter selection for hardware effici...

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60th IEEE Vehicular Technology Conference

作者： Toender, N Reinert, M Rohling, HN Eichinger, J Tech Univ Hamburg Dept Telecommun D-2100 Hamburg Germany

ISBN: (纸本)0780385217

An efficient and hardware economic channel coding technique is essential in todays high-speed mobile communication systems. The channel coding parameters will have a large impact on the system performance (data rate and bit error rate) and also on the hardware development in terms of area consumption and timing behaviour. Therefore, important system parameters like Code Rate, Constraint Length and Viterbi Decoding Strategy (Single State or Best State and the resulting truncation depth for both strategies) have to be decided early in the design How. The objective of this paper is to discuss the technical tradeoff (system performance and hardware cost) when choosing the channel coding parameters for a system with convolutional encoding and Viterbi decoding. For a wide range of possible channel coding parameters the impact on the system performance and on hardware consumptions,, which have been acquired from Field Programmable Gate Array (FPGA) implementations', will be discussed and compared.

关键词： OFDM convolutional coding Viterbi decoder code rate constraint length best state single state FPGA prototyping

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Pre-processing of convolutional codes for reducing decoding power consumption

Pre-processing of convolutional codes for reducing decoding ...

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33rd IEEE International Conference on Acoustics, Speech and Signal Processing

作者： Shao, Wei Brackenbury, Linda Univ Manchester APT Grp Sch Comp Sci Manchester M13 9PL Lancs England

ISBN: (纸本)9781424414833

This paper presents a new pre-processing approach for convolutional codes that can provide the adaptive capability to a standard Viterbi decoder. By identifying and generating the decoded data from the zero Hamming distance path, all computations in the Viterbi decoder can be avoided. This makes it possible to stop the Viterbi decoder in real time as long as no error occurs in the received code words;the Viterbi decoder is restarted to correct errors otherwise. With this approach, significant power, i.e. 97% of a standard Viterbi decoder power dissipation, can be saved when the Eb/No is as low as 13dB.

关键词： convolutional coding adaptive decoding algorithm pre-decoding

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Performance Estimation of DSSS Wireless Systems in Impulsive Interference

Performance Estimation of DSSS Wireless Systems in Impulsive...

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Joint IEEE International Symposium on Electromagnetic Compatibility (EMC) and EMC Europe

作者： Tengstrand, Sara Orn Stenumgaard, Peter Swedish Def Res Agcy Div Informat & Aeronaut Syst Kista Sweden

ISBN: (纸本)9781479966165

Radiated interference environments can significantly degrade the performance of the digital communication systems that are widely used today. Problems from such inter-system interference might need to be analyzed beforehand or as problems occur. Another application where such analysis is of interest is in systems using dynamic allocation of spectrum, where it serves as basis for spectrum allocation. To be useful in on-line applications, the analysis method should be fast and of low complexity. A common method is therefore to approximate the interference as Additive White Gaussian Noise, AWGN. However, if the noise is impulsive, this approximation can cause large errors in Bit Error Probability (BEP) estimation. It is desirable to avoid both under-and overestimations. Underestimations can lead to interference problems in the application, while overestimating could cause expensive protection measures to be used unnecessarily. One type of systems that have not received much interest regarding error estimation are those using both error correcting codes and direct sequence spread sprectrum, DSSS. Two systems using this combination are the third generation mobile telephony standard 3G UMTS, and the global navigation systems GPS and Galileo. In this paper we derive necessary conditions for when the Gaussian approximation can be used accurately for impulsive interference, in a DSSS system using convolutional coding.

关键词： impulsive interference Performance Evaluation Spectrum allocation direct sequence spread spectrum Interchannel interference Gaussian approximation AWGN Error analysis convolutional coding dynamic allocation Digital communication systems Error correction codes CARRIER SYSTEM galileo satellite navigation systems

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On Robots Imitating Movements Through Motor Noise Prediction 7

On Robots Imitating Movements Through Motor Noise Prediction

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7th joint IEEE International Conference on Development Learning and Epigenetic Robotic (IEEE ICDL-EpiRob)

作者： Pico, Antonio Schillaci, Guido Hafner, Verena V. Lara, Bruno Humboldt Univ Adapt Syst Grp Berlin Germany Univ Autonoma Estado Morelos Cognit Robot Grp Cuernavaca Morelos Mexico

ISBN: (纸本)9781538637159

Robot ego-noise, that is the noise produced while the robot is moving around, can carry useful information about the motor system and the embodiment of the agent. We present an experiment where a mobile robot acquires knowledge about its ego-noise. In particular, we adopt a learning strategy based on self-exploration behaviours and on an inverse model for encoding the mappings between ego-noise and the motor commands that produced it. A convolutional Autoencoder is adopted for semi-supervised learning of auditory features. The inverse model maps both auditory features and perception of the robot speed to the motor commands that produced the ego-noise. We demonstrate how the trained models can be used for imitating movements from listening to the noise they produce.

关键词： Robot sensing systems Mobile robots Feature extraction Predictive models Convolution convolutional codes Manipulator sensing systems Mobile robots convolutional coding Robot Convolution Prediction models Feature extraction Inverse method Motor noise motor system Noise Semi-supervised Learning

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Low-Density Parity-Check Codes Based on Partial Unit Memory Codes 14

Low-Density Parity-Check Codes Based on Partial Unit Memory ...

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XIV Int Symposium Problems Redundancy Inform Control Syst

作者： Ivanov, Fedor Zyablov, Victor Russian Acad Sci Inst Informat Transmiss Problems Moscow Russia

ISBN: (纸本)9781479940509

In this paper we describe ensemble of Low-Density Parity-Check (LDPC) block codes based on Partial Unit Memory (P) UM codes. We study a decoding performance of received ensemble in the case of different parameters of constituent LDPC codes. The results of simulation of obtained code constructions for an iterative "belief propagation" (Sum-Product) decoding algorithm, applied in the case of transmission of a code word via a binary channel with an additive Gaussian white noise and BPSK modulation, are presented.

关键词： AWGN parity check codes BPSK modulation LDPC block codes additive Gaussian white noise belief propagation low density parity check codes partial unit memory partial unit memory codes sum-product decoding algorithm Block codes convolutional codes Decoding Iterative decoding Redundancy Simulation AWGN low density parity check codes Block codes Belief propagation parity check codes convolutional coding Iterative decoding DEcoding redundancy simulating Codes

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