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检索条件"主题词=Convolutional Code"

共 281 条记录，以下是201-210 订阅

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Scaling Method to Increase Data Rate with No Degradation in Vector Symbol Decoding Performance 20

Scaling Method to Increase Data Rate with No Degradation in ...

引用

20th Asia-Pacific Conference on Communication (APCC)

作者： Tuntoolavest, Usana Limchaikit, Kraiwee Kasetsart Univ Fac Engn Dept Elect Engn Bangkok 10900 Thailand

ISBN: (纸本)9781479964352

A scaling technique is proposed to maintain the decoding failure probability of Vector Symbol Decoding (VSD) with the increase in data rate. Specifically, the symbol size must be increased in the same ratio as the data rate. VSD is attractive since it allows for a very flexible scaling. This paper also presents a way to compute the optimal maximum number of syndromes to minimize the complexity of the decoder with no effect on the decoding performance. The results in a 2-state fading channel model show that the scaling of the symbol size from 446 to 892 (double) and to 1,784 (quadruple) bits/symbols can maintain the VSD decoding performance when the data rates are increased from 6 Mbps to 12 Mbps (double) and 24 Mbps (quadruple) respectively. General scaling ratios are also explained. The optimal numbers of maximum syndromes are presented for various convolutional codes as well.

关键词： Vector Symbol Decoding VSD channel coding convolutional code nonbinary decoder scaling increase data rate fading channel wireless mobile channel

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Collusion secure convolutional spread spectrum fingerprinting

Collusion secure convolutional spread spectrum fingerprintin...

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4th International Workshop on Digital Watermarking

作者： Zhu, Y Feng, DG Zou, W Peking Univ Inst Comp Sci & Technol Beijing 100871 Peoples R China Chinese Acad Sci State Key Lab Informat Secur Beijing 100049 Peoples R China

ISBN: (纸本)354028768X

Digital Fingerprinting is a technique for the merchant who can embed unique buyer identity marks into digital media copy and also makes it possible to identify 'traitors' who redistribute their illegal copies. This paper first discusses the collusion-resistant properties of spread-spectrum sequence against malicious attacks such as collusion combination, collusion average and additive noise. A novel two-layers secure fingerprinting scheme is then presented by concatenating the spread-spectrum code with a convolutional code. Moreover, Viterbi algorithm is improved by using Optional code Set. The code length, collusion security and performance are proved and analyzed. As the results, the proposed scheme for perceptual media has shorter fingerprinting length and achieves optimal traitor searching.

关键词： digital fingerprinting collusion secure spread spectrum convolutional code

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Soft-Decision Statistical Decoder for coded DHA FH OFDMA 5

Soft-Decision Statistical Decoder for Coded DHA FH OFDMA

引用

5th International Conference on Engineering and Telecommunication (EnT-MIPT)

作者： Kreshchuk, Alexey RAS MIPT ITTP Moscow Russia

ISBN: (纸本)9781728104317

Statistical decoders have good performance in channels with very low signal to interference ratio (SIR) such as uncoordinated multiple access systems like Dynamic Hopset Allocation Frequency Hopping OFDMA (DHA FH OFDMA). But there was no soft-output statistical decoder developed before. In this work we present such decoder. To get accurate likelihood values we also need to change the structure of statistical decoders. We estimate the performance of the proposed decoder by simulating a concatenated code with outer convolutional code. Having soft decision increases energy gain by 1.5 dB.

关键词： DHA FH OFDMA goodness-of-fit jamming convolutional code SISO decoder soft-output

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Re-configurable Optimized Area CTC codec for Wireless Applications 3

Re-configurable Optimized Area CTC Codec for Wireless Applic...

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3rd International Conference on Advances in Computing, Communications and Informatics (ICACCI)

作者： Rastogi, Mansi Mehra, Rajesh NITTTR Chandigarh Chandigarh UT India NITTTR Chandigarh ECE Dept Chandigarh UT India

ISBN: (纸本)9781479930807

Today's need of wireless communication is undergoing astounding growth in day to day process. The quality of wireless communication must be enhanced with reduced cost. A coding system is required which can provide high data rate with error free communication and reduced area utilization. Among various error correcting codes, the turbo codes known as Parallel convolutional Concatenated code (PCCC) provides performance improvement with miniaturization in communication system. In this paper, an area efficient convolutional Turbo codec of constraint length 3 is proposed. To reduce the area consumption, the proposed turbo decoder uses a single SISO (Soft Input Soft Output) decoder architecture. In SISO decoders SOVA (Soft Output Viterbi Algorithm) is used as a decoding algorithm. It is based on two step algorithm. The proposed codec design has been synthesized on Xilinx Virtex-4 (xc4vlx25-ff676-10) FPGA. The performance of proposed Turbo codec compared for FPGAs in terms of number of slices, slice flip-flops and LUTs. The Synthesis result shows 7% improvement in the utilized no. of slices and slice flip-flop of proposed encoder and approximately 3% improvement in the utilized number of slice flip-flop of the proposed decoder. The Simulink model for proposed CTC encoder and decoder is generated accordingly.

关键词： PCCC SOVA Forward Error Correction convolutional code FPGA SISO

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A Method in Timing Processing for Viterbi Algrithm

A Method in Timing Processing for Viterbi Algrithm

引用

World Automation Congress (WAC)

作者： Zhang, Zengliang Jiao, Zhi Zhou, Tong N China Inst Astronaut Engn Dept Elect Engn Langfang 065000 Peoples R China

ISBN: (纸本)9781467344975

A method in timing processing for Viterbi algorithm is proposed in this article based on the block diagram of composition. Further more, a solution scheme is proposed for soft-decision in each part of Viterbi decoder, and the problem about the timing of the clock pulse for hard-decision and serial input/parallel output in the decoding with soft-decision is introduced.

关键词： convolutional code Viterbi algorithm Timing Hard-decision Soft-decision

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Forward error correction techniques suitable for the utilization in the PLC technology

Forward error correction techniques suitable for the utiliza...

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15th International Conference on Systems, Signals and Image Processing

作者： Dlhan, Stanislav Slovak Univ Technol Bratislava Dept Telecommun FEI Bratislava 81219 Slovakia

ISBN: (纸本)9788022728560

Today's PLC systems are mostly limited in transmission speeds to several kilobits per seconds. Such speeds are certainly not sufficient for running popular services like a broadband Internet, a teleworking or the Video on Demand. This fact is reducing a chance of the PLC technology Is deployment in a wide range. One way how to overcome this problem could be in introduction of optimal errors correcting techniques into the PLC technology. In this contribution, different types of coding techniques are discussed, including RS, Turbo or convolutional codes. Theoretical analyses are focused on their positive and negative features visible in case of their deployment in the PLC transmission environment. Special attention is pointed to their robustness against noises, which is analyzed also practically in form of the simulations. Analyses and simulations are done for individual codes as well as combination of codes.

关键词： the PLC environment the PLC transmission channel the PLC simulation model RS turbo code convolutional code

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Soft-interference cancellation for downlink and uplink MC-CDMA systems

Soft-interference cancellation for downlink and uplink MC-CD...

引用

15th IEEE International Symposium on Personal, Indoor, Mobile, Radio Communications (PIMRC 2004)

作者： Benvenuto, N Bisaglia, P Finco, M Univ Padua Dipartimento Ingn Informaz I-35131 Padua Italy

ISBN: (纸本)0780385233

In this paper, a convolutional coded MC-CDMA system is considered for high-rate data transmission in a typical indoor environment with Rayleigh multipath fading. To mitigate the effect of multiple-access interference, new results with iterative parallel and successive soft-interference cancellation schemes, that can benefit from information available through decoding, are presented, both for downlink and uplink transmissions. Based on the results, combination of convolutional coding with soft successive interference cancellation (SIC) is found to be attractive also in the more critical fully loaded uplink scenario. Furthermore, in order to reduce the latency of SIC, a simplified receiver is presented where only a reduced number of users is canceled, based on a power criterion: on average the latency of the system is halved, while the offered performance is still reasonable good.

关键词： convolutional code Downlink MC-CDMA Soft-IC Uplink

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A 31.8kbps/8kHz Underwater Acoustic Single Carrier Frequency Division Multiplexing (SC-FDM) Communication System with Forward Error Correction

A 31.8kbps/8kHz Underwater Acoustic Single Carrier Frequency...

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Conference on OCEANS

作者： Suzuki, Taisaku Wada, Tomohisa Yamada, Hiromasa Nakagawa, Shigeo Univ Ryukyus Grad Sch Engn & Sci Senbaru 1 Nishihara Okinawa Japan Okinawa Coll Natl Inst Technol Henoko 905 Nago Okinawa Japan Univ Ryukyus Dept Informat Engn Senbaru 1 Nishihara Okinawa Japan Oki Seatec Co Ltd Uchiuramito 537-5 Numazu Shizuoka Japan

ISBN: (纸本)9780692946909

This paper proposes an underwater acoustic Single Carrier Frequency Division Multiplexing (SC-FDM) communication system with a forward error correction to transmit image or movie data packet from deep sea ROV (Remotely operated vehicle) etc. to surface ship. Since the SC-FDM is basically Orthogonal Frequency Division Multiple Access (OFDM) with pre-and post-coding, frequency bandwidth is efficiently utilized to deliver high data bandwidth as well as lower Peak-to-Average-Power Ratio (PAPR) of the transmitting signal. In order to realize error-free communication adaptively to wide range of Carrier signal to Noise power Ratio CNRs, 3 carrier modulations such as QPSK / 16QAM / 64QAM and 5 code rates are supported. Using 64QAM with code rate R=7/8, a 31.8 kbps in 8kHz maximum channel bandwidth has been achieved. The system utilized 20-28 kHz and subcarrier spacing of 50 Hz. Total number of sub-carriers is 161. The system is verified by Ocean experiment at Suruga Bay with 1000m deep sea in Shizuoka, Japan. At the depth of 100m, with 64QAM and code rate R= 3/4 (Rate=27.241 kb/s), Packet Error Rate (PER) = 0 % is observed. At the depth of 400m, with 64QAM and R= 2/3 (Rate=24.213 kb/s), PER=0 % is also achieved. At the depth of both 700 and 1000m, with 16QAM and code rate R=2/3 (Rate=16.140 kb/s), PER closed to 0 % is realized.

关键词： Underwater Acoustic Communication SC-FDM PAPR Doppler compensation convolutional code Viterbi decode

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Non-Gaussian interference vulnerability of coding schemes used for control channels in 4G and 5G

Non-Gaussian interference vulnerability of coding schemes us...

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International Symposium on Electromagnetic Compatibility (EMC Europe)

作者： Wiklundh, Kia Linder, Sara Swedish Def Res Agcy FOI Dept Robust Telecommun Stockholm Sweden

ISBN: (纸本)9798350307351;9798350343045

The control channels in the radio access mobile network 4G and 5G are essential for the system to work. For this issue, the channels are designed with forward error correction (FEC) codes and modulation to be very robust to interference. In general, most evaluations of the performance and, in particular, the robustness against interference are assuming an interference environment consisting of additive white Gaussian noise (AWGN). In this work, the adopted FEC and modulation for the control channels in 4G and 5G are investigated in non-Gaussian noise modelled by a Middleton's class A model or a Gaussian mixture model. It is demonstrated that both the FEC scheme and rate matcher in 4G and the newly proposed Polar code in combination with its rate matcher perform very well in non-Gaussian noise. The performance is better or resembles the performance of AWGN. The solution for 5G achieves better performance than the one for 4G, when analysing the performance for a certain E-b/N-I. However, when comparing the performance for a specific channel SIR, the behaviour is the opposite and the implementation using in 4G has a slightly lower packet error rate. Results also show that it is important that the rate recovery function in the receiver is implemented with soft combining of the repeated information.

关键词： polar code convolutional code non-Gaussian interference electromagnetic interference 4G 5G

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Analysis of coded successive interference cancellation in multicarrier DS/CDMA systems

Analysis of coded successive interference cancellation in mu...

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IEEE 6th International Symposium on Spread Spectrum Techniques and Applications

作者： Fang, L Milstein, LB Univ Calif San Diego Dept Elect & Comp Engn La Jolla CA 92093 USA

ISBN: (纸本)0780365607

This paper presents a successive interference cancellation (SIC) scheme for a multicarrier (MC) asynchronous DS/CDMA system, wherein the output of a convolutional encoder modulates bandlimited spreading waveforms at different subcarrier frequencies. In every subband, the SIC receiver successively detects the interferers' signals and substracts them from that of the user-of-interest. The SIC receiver employs maximal-ratio combining (MRC) for detection of the desired user, and feeds a soft decision Viterbi decoder. A comparison is made among SIC-MRC, matched filter detection with maximal-ratio combining (MF-MRC), and N-tap minimum mean-squared error (MMSE) receivers with optimal tap coefficients, assuming a slowly varying, frequency selective, Rayleigh fading channel, where N is the processing gain. Analysis and simulation results will show that the SIC-MRC can obtain performance comparable to that of N-tap MMSE receivers, and both of them have better ability to suppress multiple-access interference (MAI) than does the MF-MRC. on the other hand, more powerful codes do not necessarily guarantee the better performance, since frequency diversity will decrease caused by a lower code rate. Finally, with small tracking errors, results will show that SIC-MRC can still retain a performance advantage over MF-MRC.

关键词： successive interference cancellation multicarrier CDMA convolutional code bit error rate (BER)

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