检索结果-内蒙古大学图书馆

5th Asia-Pacific Conference Communications and 4th Optoloelectronics Communications Conference, APCC/OECC 1999

作者： Cong, Ling Xiaofu, Wu Songgeng, Sun Nanjing Inst. of Commun. Eng. Nanjing210016 China

For binary codes, Fossorier et al. (1998), have shown that the soft-output Viterbi algorithm (SOVA) becomes equivalent to the max-log-maximum a posteriori (map) algorithm after a modification. In this letter, such modified SOVA is generalized into nonbinary cases. The equivalence between the modified SOVA and the max-log-map algorithm is proved more straightforwardly. The modified SOVA requires only add-compare-select operations and is suitable for high-speed parallel implementation. © 1999 China Inst. Of Communications.

关键词： map algorithm Soft-input soft-output decoding Sova

来源：评论

学校读者我要写书评

暂无评论

Motion Estimation and Segmentation method Based on Integration of Spatial and Temporal Probability Models

Motion Estimation and Segmentation method Based on Integrati...

引用

3rd International Conference on Anti-Counterfeiting, Security, and Identification in Communication

作者： LingHu, Yong-fang Guizhou Univ Finance & Econ Guiyang Peoples R China

ISBN: (纸本)9781424438822

A novel video motion object automatic segmentation algorithm based on a Bayesian framework is studied in this paper. A fast estimation procedure for the posterior marginals is added to the map algorithm. The field is initialized as the temporal segmentation result and the spatial segmentation is provided as an observed field of the image. Firstly,initial segmentation is applied to obtain number of the initial motions and the corresponding initial parameters of the motion model. Then the parameters are updated by using the given parameter estimation method. The experiment results show that the algorithm proposed is effective.

关键词： Bayesian framework video object Spatio-temporal segmentation Maximizer of the posterior marginals map algorithm

来源：评论

学校读者我要写书评

暂无评论

Hybrid ToA and IMU indoor localization system by various algorithms

引用

Journal of Central South University 2019年第8期26卷 2281-2294页

作者： CHEN Xue-chen CHU Sheng LI Fan CHU Guang School of Electronics and Information Technology Sun Yat-Sen University Guangzhou 510275 China School of Metallurgy and Environment Central South University Changsha 410083 China

In this paper, we integrate inertial navigation system (INS) with wireless sensor network (WSN) to enhance the accuracy of indoor localization. Inertial measurement unit (IMU), the core of the INS, measures the accelerated and angular rotated speed of moving objects. Meanwhile, the ranges from the object to beacons, which are sensor nodes with known coordinates, are collected by time of arrival (ToA) approach. These messages are simultaneously collected and transmitted to the terminal. At the terminal, we set up the state transition models and observation models. According to them, several recursive Bayesian algorithms are applied to producing position estimations. As shown in the experiments, all of three algorithms do not require constant moving speed and perform better than standalone ToA system or standalone IMU system. And within them, two algorithms can be applied for the tracking on any path which is not restricted by the requirement that the trajectory between the positions at two consecutive time steps is a straight line.

关键词： indoor localization time of arrival (ToA) inertial measurement unit (IMU) Bayesian filter extended Kalman filter map algorithm

来源：评论

学校读者我要写书评

暂无评论

Softwaredynamics :: Sdos 1.1 Users Manual

引用

2016年

Softwaredynamics :: Sdos 1.1 Users Manual by published by

关键词： command command interpreter disk disk device disk file disk space dynamics dynamics sdos file file structure files header cluster manual map algorithm program sdos software software dynamics softwaredynamics sys system disk users

来源：评论

学校读者我要写书评

暂无评论

A low-complexity decoding algorithm for turbo codes

引用

CHINESE JOURNAL OF ELECTRONICS 2000年第3期9卷 305-308页

作者： Bai, BM Wang, XM Wang, QY Xidian Univ Natl Key Lab LSI Xian 710071 Peoples R China

A new type of recursive algorithm for decoding turbo codes is proposed, based on a symbol-by-symbol maximum a posteriori probability algorithm. It requires only a forward recursion and has lower computational complexity. The number of variables to be stored increases linearly with the decoding delay. For iterative decoding, the extrinsic information given by the new algorithm is also described. This algorithm can be used in continuous decoding for both recursive and non-recursive encoder.

关键词： turbo codes map algorithm soft-output decoding concatenated code

来源：评论

学校读者我要写书评

暂无评论

FPGA IMPLEMENTATION OF TURBO DECODERS USING BCJR algorithm

JOURNAL OF THE FACULTY OF ENGINEERING AND ARCHITECTURE OF GA...

引用

JOURNAL OF THE FACULTY OF ENGINEERING AND ARCHITECTURE OF GAZI UNIVERSITY 2011年第4期26卷 823-832页

作者： Atar, Onur Sazli, Murat H. Tubitak UZAY TR-06531 Ankara Turkey Ankara Univ Elekt Muhendisligi TR-06100 Ankara Turkey

The most difficult design issue for turbo codes, which is the most recent and successful channel coding method to approach the channel capacity limit, is the design of the iterative decoders which perform calculations for all possible states of the encoders. BCJR (map) algorithm, which is used for turbo decoders, embodies complex mathematical operations such as division, exponential and logarithm calculations. Therefore, BCJR algorithm was avoided and the sub-optimal derivatives of this algorithm such as Log-map and Max-Log-map were preferred for turbo decoder implementations. BCJR algorithm was reformulated and wrapped into a suitable structure for FPGA implementations at previous works [1]. Reformulated BCJR algorithm is implemented in this work. Complex mathematical operations which run slowly on hardware (division, exponential and logarithm calculations) are read from look-up-tables and high performance calculation structures are established. Implemented system is verified through simulations. It is observed that the BER performance obtained is better than the Log-map algorithm as expected.

关键词： BCJR algorithm map algorithm Turbo decoder FPGA

来源：评论

学校读者我要写书评

暂无评论

Iterative decoding of convolutional codes applied to separate coded PPM

引用

ELECTRONICS AND COMMUNICATIONS IN JAPAN PART I-COMMUNICATIONS 2003年第12期86卷 78-90页

作者： Harada, K Oka, I Fujiwara, C Osaka City Univ Fac Engn Osaka 5588585 Japan

Separate coding can achieve better characteristics than Reed-Solomon code in a binary vanishing channel when combined with convolutional code. Separate coding has the advantage that decoding is easy, since partial codes are decoded independently. In past decoding methods, however, decoded information other than the partial encoder under consideration is not utilized. When separate coding is applied to a PPM channel, the output of the partial encoder in question is completely correlated with the outputs of the other encoders. Thus, it should be possible to improve the error rate of the whole system by effectively utilizing the decoded information from other decoders. The purpose of this paper is to utilize the correlation between the outputs of the partial encoder in separate coding, and to propose an iterative decoding method based on the decoded information of multiple partial encoders. The improvement in the error rate, the comparative decoding complexity, and the external information to be used in iterative decoding are investigated. Computer simulations show that characteristics close to those of maximum likelihood decoding up to approximately 0.5 dB are achieved by the proposed decoding method while limiting the increase in decoding complexity due to the increase in the number of encoders. (C) 2003 Wiley Periodicals, Inc.

关键词： iterative decoding separate coding map algorithm PPM system

来源：评论

学校读者我要写书评

暂无评论

Sea Wireless Channel Coding and Decoding Technology Based on Turbo Code

Sea Wireless Channel Coding and Decoding Technology Based on...

引用

2nd International Conference on Information and Communication Technology for Education(ICTE 2015)

作者： Ming Yan Guohong Chen Peiyan Xu School of Information & Electrical Engineering Zhejiang University City College

This paper introduces the characteristics of wireless channel fading, and uses the model of Rayleigh fading channel to simulate the sea wireless channel. Using Turbo codes as the encoding and decoding scheme of sea wireless communication system. Introducing two kinds of encoding algorithm of Turbo codes, and put forward the method of re-encoding aiming to improve the performance of map decoding of Turbo codes. The re-encoding algorithm of Turbo codes will be applied to the channel codec of sea wireless communication system. Finally, we implement the new turbo encoding and decoding algorithms on DSP. Simulation shows that re-encoding method can significantly improve the map decoding performance.

关键词： Rayleigh fading channel Turbo codes map algorithm Re-encoding

来源：评论

学校读者我要写书评

暂无评论

FFT-based trellis receiver for SEFDM signals

FFT-based trellis receiver for SEFDM signals

引用

IEEE Global Communications Conference

作者： Andrey Rashich Alexandr Kislitsyn Dmitrii Fadeev Tan Ngoc Nguyen Radio and telecommunication systems department Peter the Great St. Petersburg Polytechnic University

ISBN: (纸本)9781509013296

A new FFT-based trellis receiver for multicarrier signals with nonorthogonal frequency spacing (spectrally efficient frequency division multiplexing, SEFDM) is proposed. It is based on FFT and max-log-map algorithm, which is adapted to work with frequency samples of received signal. The iterative version of demodulator is also developed. The performance of proposed iterative QPSK-SEFDM demodulation is comparable with the one of classic coded QPSK modulation while the spectral efficiency remains very high. The proposed algorithms can demodulate SEFDM signals with large number of subcarriers.

关键词： OFDM NOFDM BEFDM SEFDM Multicarrier FTN Iterative receiver map algorithm 5G iterative receiver Orthogonal frequency division multiplexing 5G mobile communication Demodulation signals Receivers demodulators Subcarriers spectral efficiency Fast Fourier transform

来源：评论

学校读者我要写书评

暂无评论

A Novel State Metric Normalization Technique for High-Throughput Maximum-a-Posteriori-Probability Decoder

A Novel State Metric Normalization Technique for High-Throug...

引用

International Conference on Advances in Computing, Communications and Informatics

作者： Rahul Shrestha Roy Paily Department of Electrical and Electronics Engineering Indian Institute of Technology Guwahati

ISBN: (纸本)9781467361262

In this paper, a new state metric normalization technique is proposed for maximum-a-posteriori-probability (map) algorithm to enhance the throughput of map decoder. Biterror-rate (BER) performance comparison showed that the map algorithm based on the proposed normalization technique has a coding gain of 0.25 dB at a BER of 10~(-4) in comparison with map algorithm based on the subtractive normalization technique. An architecture for map decoder based on the new normalization technique has been proposed with a reduced critical path delay as compared to the contributions in literature. Subsequently, a field-programmable-gate-array (FPGA) implementation of the new map decoder is carried out. Thereby, the proposed decoder based on non-parallel radix-2 and radix-4 architectures are able to achieve high throughputs of 514 Mbps and 1.028 Gbps respectively.

关键词： map algorithm Turbo code FPGA ASIC Throughput Maximum clock frequency and BER performance

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：