2007 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing最新文献_第10页

An Iterative Decision Feedback Algorithm using the Cholesky Update for OFDM with Fast Fading 基于Cholesky更新的OFDM快速衰落迭代决策反馈算法

2007 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing Pub Date : 2007-09-24 DOI: 10.1109/PACRIM.2007.4313288

P. Wan, M. McGuire

{"title":"An Iterative Decision Feedback Algorithm using the Cholesky Update for OFDM with Fast Fading","authors":"P. Wan, M. McGuire","doi":"10.1109/PACRIM.2007.4313288","DOIUrl":"https://doi.org/10.1109/PACRIM.2007.4313288","url":null,"abstract":"Orthogonal frequency-division multiplexing (OFDM) is an efficient technique for high data rate transmission in wireless communications. If the channel varies within the time duration of an OFDM symbol, intercarrier interference (ICI) creates, resulting in a degradation of the error performance. Minimum mean square error decision feedback estimation (MMSE-DFE) algorithms can combat ICI. A standard MMSE symbol detection requires a calculation of the inverse of the signal covariance matrix which has a high computational cost. For this reason, alternative MMSE techniques have been developed which use recursive calculations and decision feedback to compute symbol estimates at a low computational cost with minimal increases in error performance. However, these computations are ill-conditioned and their error performance degrades when low precision arithmetic is used. This paper proposes a new iterative MMSE-DFE algorithm with the use of Cholesky updates. This method is more stable than other iterative MMSE-DFE algorithms. Simulation results show that the method improves the performance with no increase in computational complexity.","PeriodicalId":395921,"journal":{"name":"2007 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131314524","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

A Weighted-Selective Scheduling Scheme in an Open Software Radio Environment 开放软件无线电环境下的加权选择调度方案

2007 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing Pub Date : 2007-09-24 DOI: 10.1109/PACRIM.2007.4313298

K. Zheng, Gang Li, Lin Huang

引用次数: 4

High Level Fixed Point VLSI Design with Automated Clock Gating 带自动时钟门控的高电平定点VLSI设计

2007 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing Pub Date : 2007-09-24 DOI: 10.1109/PACRIM.2007.4313248

N. Agarwal, N. Dimopoulos

{"title":"High Level Fixed Point VLSI Design with Automated Clock Gating","authors":"N. Agarwal, N. Dimopoulos","doi":"10.1109/PACRIM.2007.4313248","DOIUrl":"https://doi.org/10.1109/PACRIM.2007.4313248","url":null,"abstract":"Here we present a high level VLSI design platform, which supports the use of fixed point operations and automated clock gating of registers. This platform has been implemented by extending the CoDeL design suite. CoDeL allows hardware description at the algorithm level, and thus dramatically reduces design time. Also, it automatically inserts clock gating at the behavioral level to reduce dynamic power dissipation in the resulting architecture. This is, to our knowledge, the first hardware design environment that allows an algorithmic description of a component and yet produces a power aware design. We use the DSPstone benchmark to thoroughly evaluate this fixed point design platform for the design of power efficient DSP architectures. We find that, compared to a modern DSP, the CoDeL platform produces designs with somewhat slower run times but dramatically lower power dissipation. Next we use power analysis to compare the effectiveness of CoDeL's automated clock gating as compared to automated clock gating using synopsys tools. A simulation based power analysis shows that CoDeL's clock gating provides 16% more power savings than Synopsys' automated clock gating alone.","PeriodicalId":395921,"journal":{"name":"2007 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132457807","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Steganalysis of Pixel-Value Differencing Steganographic Method 像素值差分隐写法的隐写分析

2007 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing Pub Date : 2007-09-24 DOI: 10.1109/PACRIM.2007.4313232

V. Sabeti, S. Samavi, M. Mahdavi, S. Shirani

引用次数: 35

Pipelined Orientation Estimation in Fingerprint Images 指纹图像的流水线方向估计

2007 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing Pub Date : 2007-09-24 DOI: 10.1109/PACRIM.2007.4313228

E. Alibeigi, S. Samavi, Z. Rahmani, S. Shirani

引用次数: 2

Identifying Text Objects Based on Expansion 基于扩展的文本对象识别

2007 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing Pub Date : 2007-09-24 DOI: 10.1109/PACRIM.2007.4313223

K. Ohkubo, T. Miura

引用次数: 0

A Cost Minimization Algorithm for a Multiuser OFDM Cognitive Radio System 多用户OFDM认知无线电系统的成本最小化算法

2007 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing Pub Date : 2007-09-24 DOI: 10.1109/PACRIM.2007.4313287

Tao Qin, C. Leung

引用次数: 13

Implementation of a Flexible Encoder for Structured Low-Density Parity-Check Codes 结构化低密度奇偶校验码灵活编码器的实现

2007 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing Pub Date : 2007-09-24 DOI: 10.1109/PACRIM.2007.4313268

S. Kopparthi, D. Gruenbacher

引用次数: 27

Leveraging Conceptual Models of Trust in Automated Systems to Promote `Appropriate Trust' in Autonomic Systems 利用自动化系统中的信任概念模型促进自主系统中的“适当信任”

2007 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing Pub Date : 2007-09-24 DOI: 10.1109/PACRIM.2007.4313276

Qin Zhu, D. Dawson, P. Agrawal, H. A. Muller

{"title":"Leveraging Conceptual Models of Trust in Automated Systems to Promote `Appropriate Trust' in Autonomic Systems","authors":"Qin Zhu, D. Dawson, P. Agrawal, H. A. Muller","doi":"10.1109/PACRIM.2007.4313276","DOIUrl":"https://doi.org/10.1109/PACRIM.2007.4313276","url":null,"abstract":"There are subtle differences between automated and autonomic software systems with respect to the observability of information that supports trust between the system and its operators (designers, administrators, and users). Applying conceptual models of trust developed for human relationships with automated systems directly to autonomic systems is simply inadequate. An autonomic system can, however, be modeled as a composition of sub-level automation systems. In this manner, designers can engender 'appropriate trust' in autonomic systems using conceptual models developed for automated systems, but must consider how administrators and users will observe information required for trust, specifically: purpose, process, and performance. It is possible to provide designers, administrators and users with information to engender trust by using an abstraction hierarchy modeling framework (for example: ecological interface design). In this paper, we propose the use of goal models during early requirements engineering to describe the purpose information of a system in an abstraction hierarchy.","PeriodicalId":395921,"journal":{"name":"2007 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing","volume":"115 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121089356","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Avoiding PAPR degradation in Convolutional Coded OFDM Signals 避免卷积编码OFDM信号的PAPR退化

2007 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing Pub Date : 2007-09-24 DOI: 10.1109/PACRIM.2007.4313237

Emma Frontana, Ivan Fair

引用次数: 4