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检索条件"主题词=Turbo coding"

共 204 条记录，以下是131-140 订阅

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Performance of the turbo coded HomePlug AV system over power-line channels

Performance of the turbo coded HomePlug AV system over power...

引用

11th IEEE International Symposium on Power Line Communications and its Applications (ISPLC 2007)

作者： Guerrieri, L. Bisaglia, P. Dell'Amico, G. Guerrini, E. Dora Spa STMicroelect Grp Via Lavoratori Col Mt 24 I-11100 Aosta Italy

ISBN: (纸本)9781424410897

The next generation technology of HomePlug, called HomePlug AV, aims at providing very high-quality connectivity for the in-home distribution of data and multi-stream entertainment using existing power-line wiring. To obtain very robust performance a powerful turbo convolutional code is adopted. In this paper, by means of simulations, the performance of the turbo coded HomePlug AV system is examined under a realistic power-line channel model. In particular, the effects of the interleaver's length and of the number of iterations in an improved Max-Log-MAP turbo decoder are investigated. Results show that few iterations of the turbo decoding process give a massive gain in performance under the considered environment.

关键词： turbo coding interleaver OFDM HomePlug AV

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Frequency Domain Approach to Channel Estimation and Signal Detection in HSUPA

Frequency Domain Approach to Channel Estimation and Signal D...

引用

IEEE 74th Vehicular Technology Conference (VTC)

作者： Moilanen, Ilkka Hahtola, Paavo Tormalehto, Jukka VTT Tech Res Ctr Finland Oulu Finland

ISBN: (纸本)9781424483273

In high speed uplink packet access (HSUPA), higher order modulation methods are one possible solution to support increased peak data rate requirements at high signal-to-interference-plus-noise ratios (SINR). Multipath propagation affects peak data rate performance. At high SINR, relatively large number of multipath components can be exploited for signal detection. It is computationally more cost-efficient to exploit such a number of diversity components in the frequency than in the time domain. Therefore, we have chosen an advanced receiver structure, in which frequency domain processing is utilized. We introduce simple finger allocation and channel estimation algorithms based on the frequency domain despreading. They are proven to offer good performance throughout the receiver stages. To combat intersymbol interference (ISI), single-user chip-level frequency domain equalizer (FDE) is used to detect the high data rate users. Parallel interference cancellation (PIC) is applied in the frequency domain to suppress the interference from data users to speech users. The performance of the whole receiver chain is presented as a function of the number of the fingers, which illustrates the demand for low complexity frequency domain processing. In particular, the simple finger allocation, where a sub-window of consecutive fingers is allocated, is an interesting option for the high SINR region.

关键词： HSUPA frequency domain processing channel estimation MMSE equalization interference cancellation turbo coding

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VLSI map decoder architectural analysis

VLSI map decoder architectural analysis

引用

IEEE Workshop on Signal Processing Systems Design and Implementation

作者： Elassal, M Bayoumi, M Univ Louisiana CACS Lafayette LA 70504 USA

ISBN: (纸本)0780385047

This paper presents an architectural analysis for the MAP decoder hardware implementations. The use of the graphical representation of the trellis-time graph is proposed to analytically model the scheduling between different computational operations. The ALAP schedule policy for the branch metric operations is used to minimize both the branch memory size and power consumption. In addition, key architecture metrics are derived from the analytical model. Finally, FPGA implementation of various architectures are presented.

关键词： maximum likelihood decoding turbo codes iterative decoding VLSI field programmable gate arrays maximum a posteriori decoding turbo coding VLSI MAP decoder decoder hardware implementation trellis-time graph graphical representation ALAP schedule policy branch metric operations branch memory size minimization power consumption minimization FPGA implementation Iterative decoding turbo codes Field programmable gate arrays maximum likelihood decoding Power consumption decoders

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Link Adaptation as a Technique to Achieve Information Theoretic Limits in MIMO Systems?

Link Adaptation as a Technique to Achieve Information Theore...

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11th International Conference on Telecommunications in Modern Satellite, Cable and Broadcasting Services (TELSIKS)

作者： Drajic, Dusan B. Ivanis, Predrag N. Univ Belgrade Innovat Ctr Sch Elect Engn Bulevar Kralja Aleksandra 73 Belgrade 11000 Serbia Univ Belgrade Sch Elect Engn Belgrade 11000 Serbia

ISBN: (纸本)9781479909025

In this paper, we consider multiple-input-multiple output (MIMO) systems based on multichannel beamforming (MB). We first consider capacity of the wireless communication systems for different modulation techniques and decision rules, and its extension for the open-loop and closed-loop MIMO systems. Eigenchannel power allocation and joint turbo coding and adaptive modulation are considered as a promising link adaptation techniques that should maximize achievable throughputs in considered MIMO systems.

关键词： Adaptive modulation capacity multiple-input multiple-output channels multichannel beamforming Rayleigh fading trellis coding modulation turbo coding

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Multicarrier Multiantenna Space-Time Architectures for Frequency-Selective Channels

Multicarrier Multiantenna Space-Time Architectures for Frequ...

引用

International Conference on Innovations in Information, Embedded and Communication Systems (ICIIECS)

作者： Zaman, Md Sayem Uz Mondal, Himadri Shekhar Hasan, Md Ali Kadir, Mohammad Ismat Khulna Univ Elect & Commun Engn Discipline Khulna Bangladesh

ISBN: (纸本)9781509032945

Space-time multiple antenna architectures such as space-time block codes (STBC), space-time shift keying (STSK), are well known coding techniques that are employed for enhancing the capacity of a wireless communication system without affecting the bandwidth efficiency. The work presented in this paper provides a bit error rate analysis of these space-time architectures with orthogonal frequency division multiplexing (OFDM) system transmitting over dispersive channels. Both the uncoded and the channel coded systems were analysed. The simulation results in this paper show that the system may be applied for dispersive channel scenario and provide improved performance even in hostile frequency selective paths.

关键词： Space-Time Block coding (STBC) Orthogonal Frequency Division Multiplexing (OFDM) Rayleigh Fading turbo coding

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Investigation of the Performance of Single Carrier Visible Light Communication Systems in Multi-Path Fading Optical Channels 28

Investigation of the Performance of Single Carrier Visible L...

引用

28th Signal Processing and Communications Applications Conference (SIU)

作者： Yasar, Sabiha Sinop, Hayriye Tek, Yusuf Islam Tuna, Elif Busra Karaerik, Kudret Ozen, Ali Nuh Naci Yazgan Univ Elekt Elekt Muhendisligi BOlumu HARGEM Kayseri Turkey

ISBN: (纸本)9781728172064

In this paper, the performances of single carrier visible light communication systems are analyzed in multi-path fading optical channels. Distortions in the data sent due to the multipath optical channel are corrected by linear and nonlinear channel equalizers. Computer simulations are performed to compare the equalizers with each other and to obtain the uncoded and encoded bit error rate performances. As a result of the simulation results, it was observed that the Convolutional coded and turbo coded system eliminates the error floor at each iteration.

关键词： visible light communication multipath optical channel channel equalizer convolutional coding turbo coding

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A Weighted Multi-band Algorithm Using Estimation BER in Underwater Acoustic Communication 12

A Weighted Multi-band Algorithm Using Estimation BER in Unde...

引用

12th International Conference on Ubiquitous and Future Networks (ICUFN)

作者： Shin, Jieun Jeong, Hyunwoo Jeong, Jiwon KMOU Dept Radio Engn Busan South Korea

ISBN: (纸本)9781728164762

The multi-band UWAS communication techniques are effective in terms of performance and throughput efficiency. However, the multi-band configuration in a particular band affects the output from the entire bands. This problem can be solved through a receiving end that analyzes error rates of each band. In this paper, we proposed an estimation BER algorithm which get the reliability of received data to set the weighting value to each band. Therefore, we analyzed the efficiency of multi-band transmission scheme with estimation BER and 3 [dB] performance gain is obtained.

关键词： multi-band UWAS weighting estimation BER turbo coding

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Transmission of 2D images using Kalman-turbo systems

Transmission of 2D images using Kalman-Turbo systems

引用

3rd International Conference on Computing, Communications and Control Technologies

作者： Odabasioglu, Niyazi Ucan, Osman N. Tanc, A. Korhan Univ Istanbul TR-34320 Istanbul Turkey

ISBN: (纸本)9806560477

In this paper, in order to compress and enhance 2D images transmitted over wireless channels, a new scheme called Kalman-turbo (KT) is introduced. In this scheme, the original image is partitioned into 2(N) quantization levels and each of the N-bit planes is coded by turbo encoder. After noise corruption of the channel, each of the noisy bit planes is processed iteratively by a joint equalization block, which is composed of low-complexity 2D binary Kalman filter and the turbo decoder. In our Kalman filter, state equations are modified in order to take the advantage of two-dimensionality, and, previous soft decisions are taken into account to avoid divergence of Kalman filter. Simulation results show that the performance of the KT system is superior at low SNRs when compared with that of plain turbo decoding algorithms. We can also achieve compression by any selection of N. Hence, we conclude that KT system will be a compromising approach in 2D image transmission.

关键词： Kalman filtering turbo coding image processing iterative decoding wireless channels

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GPS Signal Jamming and Anti-jamming Strategy - A Theoretical Analysis

GPS Signal Jamming and Anti-jamming Strategy - A Theoretical...

引用

IEEE Annual India Conference (INDICON)

作者： Purwar, Anupam Joshi, Divya Chaubey, Vinod Kumar Indian Inst Sci Ctr Excellence Hyperson Bangalore Karnataka India Birla Inst Technol & Sci Pilani Dept Elect & Elect Engn Pilani Rajasthan India

ISBN: (纸本)9781509036462

The weak strength of GPS signal makes it very vulnerable to jamming. This calls for appropriate modeling and implementation of GPS signal source and jammers that are used to jam GPS signal. The present work describes a simple and efficient way to simulate GPS signal using MATLAB with focus on investigation of GPS signal jamming and devising an anti-jamming technique to counter different jamming scenarios besides Additive white Gaussian noise (AWGN). The jamming types influencing GPS Signal have been identified and suitable jamming scenarios have been modeled using MATLAB. The effect of each jamming signal type on GPS signal has been quantified by estimation of Bit error rate (BER) for different jamming to signal (J/S) ratio. A background study of different anti-jamming techniques for GPS signal has been carried out and turbo coding has been implemented as a suitable measure to counter the effect of GPS signal jamming.

关键词： Global Positioning System (GPS) Bit Error Rate (BER) Jamming to signal (J/S) ratio Modulation Additive white Gaussian noise (AWGN) Demodulation Anti-Jamming turbo coding

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Performance analysis of 64QAM turbo coded OFDM for 4G applications 8

Performance analysis of 64QAM Turbo coded OFDM for 4G applic...

引用

8th International Conference on Advances in Computing & Communications (ICACC)

作者： Rao, Gangula Rajeswara Rao, Gottapu Sasibhushana GVP Coll Engn Autonomous Visakhapatnam Andhra Pradesh India Andhra Univ Coll Engn Autonomous Dept ECE Visakhapatnam Andhra Pradesh India

In this paper, analysis is made on bit error rate (BER) performance for digital video broadcasting using turbo coded Orthogonal Frequency Division Multiplexing(OFDM).The aim is to achieve energy efficiency in extremely noise environment channel condition. turbo coding is one of the most attractive coding techniques since it has been proposed, because it can achieve the error correction capability near Shannon's limit. turbo code provides significant coding gain by utilizing two relatively simple constituent convolutional encoders, which are concatenated in parallel through an interleaver. The performance of 64 QAM with turbo encoding technique is verified for various code rates at different bit error rates. The BER performance is strongly influenced by signal to noise ratio. Use of parallel concatenated convolutional codes (PCCC) turbo encoder with interlever and soft decision BCJR decoder provides better performance by randomization. The fading channels considered here are Additive White Gaussian noise (AWGN) along with Rician Fading Channel. Result shows that for Eb/No Value of 20dB, lower code rates are performed better BER performance (10-3) i.e. errors observed are less for lower code rates at 20dB of Eb/No value. The structure of the SIMULINK design is developed for different code rates with turbo coded OFDM, 64 QAM and the results are analyzed using a BER tool of MATLAB version 2017a. (C) 2018 The Authors. Published by Elsevier B.V.

关键词： BER performance OFDM noise environmen Spectral efficiency 64QAM Rician fading turbo coding

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