检索结果-内蒙古大学图书馆

Fast parallel decoding of double-error-correcting binary BCH codes

APPLIED MATHEMATICS LETTERS 1998年第6期11卷 11-14页

作者： Gulliver, TA Lin, W Dehne, F Univ Canterbury Dept Elect & Elect Engn Christchurch New Zealand Carleton Univ Dept Syst & Comp Engn Ottawa ON K1S 5B6 Canada Carleton Univ Dept Comp Sci Ottawa ON K1S 5B6 Canada

关键词： BCH codes parallel decoding

来源：评论

学校读者我要写书评

暂无评论

Come and Be Served: parallel decoding for COTS RFID Tags

引用

IEEE-ACM TRANSACTIONS ON NETWORKING 2017年第3期25卷 1569-1581页

作者： Ou, Jiajue Li, Mo Zheng, Yuanqing Nanyang Technol Univ Singapore 639798 Singapore Inst High Performance Comp Singapore 138632 Singapore Nanyang Technol Univ Sch Comp Sci & Engn Singapore 639798 Singapore Hong Kong Polytech Univ Dept Comp Hong Kong Hong Kong Peoples R China

Current commodity RFID systems incur high communication overhead due to severe tag-to-tag collisions. Although some recent works have been proposed to support parallel decoding for concurrent tag transmissions, they require accurate channel measurements, tight tag synchronization, or modifications to standard RFID tag operations. In this paper, we present BiGroup, a novel RFID communication paradigm that allows the reader to decode the collision from multiple commodity-off-the-shelf (COTS) RFID tags in one communication round. In BiGroup, COTS tags can directly join ongoing communication sessions and get decoded in parallel. The collision resolution intelligence is solely put at the reader side. To this end, BiGroup examines the tag collisions at RFID physical layer from constellation domain as well as time domain, exploits the underutilized channel capacity due to low tag transmission rate, and leverages tag diversities. We implement BiGroup with USRP N210 software radio that is able to read and decode multiple concurrent transmissions from COTS passive tags. Our experimental study gives encouraging results that BiGroup greatly improves RFID communication efficiency, i.e., 11 times performance improvement compared with the alternative decoding scheme for COTS tags.

关键词： RFID systems physical layer parallel decoding

来源：评论

学校读者我要写书评

暂无评论

Design of dividable interleaver for parallel decoding in turbo codes

引用

ELECTRONICS LETTERS 2002年第22期38卷 1362-1364页

作者： Kwak, J Lee, K Korea Adv Inst Sci & Technol Dept Elect Engn & Comp Sci Taejon 305701 South Korea

A dividable interleaving method is proposed for turbo codes with parallel architecture to achieve high-throughput. This method not only solves the memory conflict problem in extrinsic information memory, but reduces the required memory for the interleaver. Many kinds of interleaver type are applicable to this method, the BER performance is similar to that achieved by other interleavers.

关键词： turbo codes interleaved codes parallel decoding BER performance extrinsic information memory iterative decoding parallel architectures error statistics memory conflict problem Codes dividable interleaver design

来源：评论

学校读者我要写书评

暂无评论

Faster and Better Grammar-Based Text-to-SQL Parsing via Clause-Level parallel decoding and Alignment Loss 11th

Faster and Better Grammar-Based Text-to-SQL Parsing via Clau...

引用

11th CCF International Conference on Natural Language Processing and Chinese Computing (NLPCC)

作者： Wu, Kun Wang, Lijie Li, Zhenghua Xiao, Xinyan Baidu Inc Beijing Peoples R China Soochow Univ Sch Comp Sci & Technol Inst Artificial Intelligence Suzhou Peoples R China

ISBN: (纸本)9783031171895;9783031171888

As a mainstream approach, grammar-based models have achieved high performance in text-to-SQL parsing task, but suffer from low decoding efficiency since the number of actions for building SQL trees are much larger than the number of tokens in SQL queries. Meanwhile, intuitively it is beneficial from the parsing performance perspective to incorporate alignment information between SQL clauses and question segments. This paper proposes clause-level parallel decoding and alignment loss to enhance two high-performance grammar-based parsers, i.e., RATSQL and LGESQL. Experiments on the Spider dataset show our approach improves the decoding speed of RATSQL and LGESQL by 18.9% and 35.5% respectively, and also achieves consistent improvement in parsing accuracy, especially on complex questions.

关键词： Text-to-SQL parsing Grammar-based parser Clause-level alignment parallel decoding

来源：评论

学校读者我要写书评

暂无评论

FTrack: parallel decoding for LoRa Transmissions 19

FTrack: Parallel Decoding for LoRa Transmissions

引用

17th ACM Conference on Embedded Networked Sensor Systems (SenSys)

作者： Xia, Xianjin Zheng, Yuanqing Gu, Tao Hong Kong Polytech Univ Hong Kong Peoples R China RMIT Univ Melbourne Vic Australia

ISBN: (纸本)9781450369503

LoRa has emerged as a promising Low-Power Wide Area Network (LP-WAN) technology to connect a huge number of Internet-ofThings (IoT) devices. The dense deployment and an increasing number of loT devices lead to intense collisions due to uncoordinated transmissions. However, the current MAC/PHY design of LoRaWAN fails to recover collisions, resulting in degraded performance as the system scales. This paper presents FTrack, a novel communication paradigm that enables demodulation of collided LoRa transmissions. FTrack resolves LoRa collisions at the physical layer and thereby supports parallel decoding for LoRa transmissions. We propose a novel technique to separate collided transmissions by jointly considering both the time domain and the frequency domain features. The proposed technique is motivated from two key observations: (1) the symbol edges of the same frame exhibit periodic patterns, while the symbol edges of different frames are usually misaligned in time;(2) the frequency of LoRa signal increases continuously in between the edges of symbol, yet exhibits sudden changes at the symbol edges. We detect the continuity of signal frequency to remove interference and further exploit the time-domain information of symbol edges to recover symbols of all collided frames. We implement Mack on a low-cost software defined radio. Our testbed evaluations show that FTrack demodulates collided LoRa frames with low symbol error rates in diverse SNR conditions. It increases the throughput of LoRaWAN in real usage scenarios by up to 3 times.

关键词： Internet of Things LoRaWAN collision parallel decoding

来源：评论

学校读者我要写书评

暂无评论

Enhanced parallel decoding for H.264/AVC CAVLC by Using Precomputation

Enhanced Parallel Decoding for H.264/AVC CAVLC by Using Prec...

引用

International SoC Design Conference 2008

作者： Yeo, Donghoon Shin, Hyunchul Hanyang Univ Sch Mechatron Engn Ansan South Korea Hanyang Univ Sch Elect & Comp Engn Ansan South Korea

ISBN: (纸本)9781424425983

A new effective parallel decoding method has been developed for context-based adaptive variable length codes. In this paper, several new design ideas have been devised for scalable parallel processing, less area, and less power. We use simplified logical operations instead of memory look-ups for effective parallel decoding. Up to M bits of input stream is simultaneously analyzed. Prefix precomputation is newly introduced to further optimize the decoder. High speed parallel decoding is possible with our method. For similar decoding rates (1.57codes/cycle for M=8), our new approach uses 46% less area than the typical conventional method.

关键词： parallel decoding CAVLC CAVLD H.264

来源：评论

学校读者我要写书评

暂无评论

Canon: Exploiting Channel Diversity for Reliable parallel decoding in Backscatter Communication 26

Canon: Exploiting Channel Diversity for Reliable Parallel De...

引用

26th IEEE International Conference on Network Protocols (INCP)

作者： Jiang, Chengkun He, Yuan Jin, Meng Zheng, Xiaolong Guo, Junchen Tsinghua Univ Sch Software Beijing Peoples R China Tsinghua Univ BNRist Beijing Peoples R China

ISBN: (纸本)9781538660430

Backscatter communication, due to its low energy consumption, attract a broad range of applications. The through-put of such low-power communication is however limited. parallel backscatter is deemed as a promising technique for improving the overall throughput by enabling concurrent transmissions of the backscattering tags. The state-of-the-art approaches for parallel backscatter assume that all the states of the collided signals are distinguishable in the In-phase and Quadrature (IQ) signal plane. In this paper, we disclose the superclustering phenomenon that makes the assumption untenable and significantly degrades the overall performance. Moreover, we observe that the indistinguishable states at different channels are not the same due to the intrinsic channel diversity. Motivated by the observation, we propose Canon, an approach that exploits the channel diversity of the backscatter tags for reliable parallel decoding. In Canon, we address two critical challenges: (i) designing the Multi-Carrier Backscatter (MCB) module to extract the collided signals simultaneously from multiple channels, (ii) designing the Multi-Channel Cluster Union (MCCU) algorithm to distinguish each state of the collided signals. The experiments demonstrate that Canon can achieve over 10x higher throughput than the state-of-the-art approaches.

关键词： Backscatter parallel decoding Multiple Channels Concurrent Transmission

来源：评论

学校读者我要写书评

暂无评论

Come and Be Served: parallel decoding for COTS RFID Tags 15

Come and Be Served: Parallel Decoding for COTS RFID Tags

引用

21st Annual International Conference on Mobile Computing and Networking (MobiCom)

作者： Ou, Jiajue Li, Mo Zheng, Yuanqing Nanyang Technol Univ Sch Comp Engn Singapore Singapore Hong Kong Polytech Univ Dept Comp Hong Kong Peoples R China

ISBN: (纸本)9781450336192

Current commodity RFID systems incur high communication overhead due to severe tag-to-tag collisions. Although some recent works have been proposed to support parallel decoding for concurrent tag transmissions, they require accurate channel measurements, tight tag synchronization, or modifications to standard RFID tag operations. In this paper, we present BiGroup, a novel RFID communication paradigm that allows the reader to decode the collision from multiple COTS (commodity-off-the-shelf) RFID tags in one communication round. In BiGroup, COTS tags can directly join ongoing communication sessions and get decoded in parallel. The collision resolution intelligence is solely put at the reader side. To this end, BiGroup examines the tag collisions at RFID physical layer from constellation domain as well as time domain, exploits the under-utilized channel capacity due to low tag transmission rate, and leverages tag diversities. We implement BiGroup with USRP N210 software radio that is able to read and decode multiple concurrent transmissions from COTS passive tags. Our experimental study gives encouraging results that BiGroup greatly improves RFID communication efficiency, i.e., 11 x performance improvement compared to the alternative decoding scheme for COTS tags and 6x gain in time efficiency when applied to EPC C1G2 tag identification.

关键词： RFID systems physical layer parallel decoding

来源：评论

学校读者我要写书评

暂无评论

Reliability Enhancement without Employing STCs of a 3 x 3 MIMO Communication System Using a parallel decoding Technique

Reliability Enhancement without Employing STCs of a 3 x 3 MI...

引用

International Conference on Engineering Technology and their Applications (IICETA)

作者： Mohamed, Wurod Qasim Hamidian, Karim Univ Diyala Dept Elect Engn Diyala Iraq Calif State Univ Fullerton Dept Elect Engn Fullerton CA 92634 USA

ISBN: (纸本)9781538678589

In this paper, the performance analysis of a(3 x 3)Multiple Input Multiple Output (MIMO) communication system is performed to achieve spatial diversity using linear minimum mean square estimation (LMMSE) decoding method at the receiver. We propose an efficient algorithm that achieves both spatial diversity and spatial multiplexing simultaneously. We called it parallel processing decoding technique. The proposed technique increases the rate of decoded symbol, improves the reliability of the transmission without employing STCs, and prevents any possible error propagation that may be presented in other sequential decoding methods. Simulation results demonstrate the advantages of using the proposed novel technique.

关键词： MIMO decoding parallel Detection Technique V-BLST parallel decoding LMMSE

来源：评论

学校读者我要写书评

暂无评论

Towards parallel decoding with Compressive Sensing in Multi-Reader Large-Scale RFID System 15

Towards Parallel Decoding with Compressive Sensing in Multi-...

引用

IEEE International Conference on RFID (RFID)

作者： Sun, Wei Ohio State Univ Dept Comp Sci & Engn Columbus OH 43210 USA

ISBN: (纸本)9781665440905

The commodity passive RFID system employs slotted ALOHA protocol to interrogate the tags within the reader's communication range. So, at each time slot, there is only one RFID tag communicating with the reader. This degrades the network throughput, especially in large-scale RFID deployments such as warehouses. Recently, parallel decoding techniques are proposed, which can only read less than ten tags at each time slot. So, it is not applicable for warehouse applications, where there are thousands of RFID tags. In this paper, we propose to achieve parallel decoding with compressive sensing technique for multi-reader large-scale RFID system. Since it is difficult to decode the collisions from multiple tags at one reader, we distributively deploy multiple readers. However, we have to consider the inter-reader interference. Even though there are thousands of tags deployed in the large warehouse, they may not backscatter the signals at each time slot simultaneously due to the heterogeneity. Therefore, this sparsity property of backscattering signals can allow us to leverage compressive sensing to decode multiple tags simultaneously with multiple readers. Our simulation results reveal that compressive sensing can efficiently achieve parallel decoding in multi-reader large-scale RFID system.

关键词： Commodity Passive RFID System parallel decoding Multi-Reader Large-Scale RFID system Compressive Sensing

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：