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2007 IEEE Sarnoff Symposium最新文献

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Wavelength locked loops for optical communication networks 光通信网络用波长锁定环
2007 IEEE Sarnoff Symposium Pub Date : 2007-04-01 DOI: 10.1109/SARNOF.2007.4567383
C. DeCusatis, L. Jacobowitz
{"title":"Wavelength locked loops for optical communication networks","authors":"C. DeCusatis, L. Jacobowitz","doi":"10.1109/SARNOF.2007.4567383","DOIUrl":"https://doi.org/10.1109/SARNOF.2007.4567383","url":null,"abstract":"Optical communication systems based on dense wavelength division multiplexing (DWDM) would benefit from the ability to adjust the operating wavelength of a laser transmitter. Previous attempts, including thermal adjustment, etalon based wavelength locking, and various types of optical frequency and phase locked loops such as the Pound-Drever-Hall technique suffer from weaknesses including sensitivity to noise at their zero crossings and non-signed error signals which require calibrated differential receivers. In this paper, we describe a new servocontrol circuit technique for wavelength locked feedback loops which overcome many of these concerns. Experimental results are presented illustrating this technique, in which a Fabry-Perot laser is locked to a commercially available DWDM filter within an accuracy of about 3 nm without the need fort thermoelectric cooling.","PeriodicalId":293243,"journal":{"name":"2007 IEEE Sarnoff Symposium","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132883790","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
Short length CDMA codes for wireless sensor networks 用于无线传感器网络的短长度CDMA代码
2007 IEEE Sarnoff Symposium Pub Date : 2007-04-01 DOI: 10.1109/SARNOF.2007.4567316
R. Poluri, A. Akansu
{"title":"Short length CDMA codes for wireless sensor networks","authors":"R. Poluri, A. Akansu","doi":"10.1109/SARNOF.2007.4567316","DOIUrl":"https://doi.org/10.1109/SARNOF.2007.4567316","url":null,"abstract":"Wireless sensor networks consist of a large number sensors spread across a given geographical area. Each sensor has its own communication capability as well as certain level of intelligence for signal processing and networking. As the sensor nodes are densely populated, communication range requirement for these nodes is smaller. After signal detection, a number of sensor nodes communicate over the same wireless multiuser channel. This necessitates the use of orthogonal codes with good cross correlation properties to mitigate multi access interference (MAI). In sensor networks, due to the dense placement of nodes, limited availability of power brings different metrics for optimality where short length spreading codes might be utilized for coding purposes. In this paper, a design methodology for the generation of such short length varying power orthogonal code sets with multiple levels of chip values is presented. BER characteristics of these short length codes are presented for two user and multiuser scenarios in AWG noise environment. As dynamic utilization of spreading code libraries consisting of multiple orthogonal sets brings additional network security at the code level, we expect spreading code rich system solutions in the future.","PeriodicalId":293243,"journal":{"name":"2007 IEEE Sarnoff Symposium","volume":"76 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130225918","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: 14
Performance analysis of a novel real-time closed-loop technique for non-linearity correction of power amplifiers 一种新型功率放大器非线性校正实时闭环技术的性能分析
2007 IEEE Sarnoff Symposium Pub Date : 2007-04-01 DOI: 10.1109/SARNOF.2007.4567307
A. Reddy, Qing Li, Walid Ahmed, E. Carey
{"title":"Performance analysis of a novel real-time closed-loop technique for non-linearity correction of power amplifiers","authors":"A. Reddy, Qing Li, Walid Ahmed, E. Carey","doi":"10.1109/SARNOF.2007.4567307","DOIUrl":"https://doi.org/10.1109/SARNOF.2007.4567307","url":null,"abstract":"In this paper we discuss performance results of a novel real-time closed-loop power amplifier (PA) linearization technique that has originally been proposed by Ahmed and Li. The novel approach performs on-the-fly prediction and measurement of the PA AM/AM and AM/PM non-linearity, stores such non-linear characteristics and calculates their inverse functions in order to pre-distort the base-band amplitude and phase signals modulating the PA such that the combination, or the resultant, of the pre-distorter and the PA leads to a linear behavior at the output of the PA. We present a model of our predictor based approach and evaluate its performance for an GSM/EDGE application. The key performance metrics we evaluate have been based on the GSM/EDGE requirements, such as the Error Vector Magnitude (EVM), Switching Transients (ST), Adjacent Channel Power Ratio (ACPR), transmit time mask, modulation spectrum and PAE.","PeriodicalId":293243,"journal":{"name":"2007 IEEE Sarnoff Symposium","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130471549","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
Bandwidth management of voice and data traffic overwireless-optical networks 无线光网络上话音和数据流量的带宽管理
2007 IEEE Sarnoff Symposium Pub Date : 2007-04-01 DOI: 10.1109/SARNOF.2007.4567372
D. Cavendish, D. Qian, T. Wang, Chi Zhou
{"title":"Bandwidth management of voice and data traffic overwireless-optical networks","authors":"D. Cavendish, D. Qian, T. Wang, Chi Zhou","doi":"10.1109/SARNOF.2007.4567372","DOIUrl":"https://doi.org/10.1109/SARNOF.2007.4567372","url":null,"abstract":"In this paper, we study bandwidth management of a wireless/optical based access/metro network in support of voice and data services. For voice services, we use a finite state Markov Chain to estimate the blocking probability of voice circuits over an Adaptive modulation and coding wireless channel, as a function of the channel parameters. For data services, we evaluate a rate matching and a buffer level control schemes to adjust optical provisioned bandwidth with the wireless channel capacity. We use analysis and event-driven simulation to substantiate our findings.","PeriodicalId":293243,"journal":{"name":"2007 IEEE Sarnoff Symposium","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125282296","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
A modified half U-slot microstrip patch antennas with shorting wall 一种改进的带短壁的半u型槽微带贴片天线
2007 IEEE Sarnoff Symposium Pub Date : 2007-04-01 DOI: 10.1109/SARNOF.2007.4567369
A. Nandgaonkar, S. Deosarkar, S. Shirbahadurkar
{"title":"A modified half U-slot microstrip patch antennas with shorting wall","authors":"A. Nandgaonkar, S. Deosarkar, S. Shirbahadurkar","doi":"10.1109/SARNOF.2007.4567369","DOIUrl":"https://doi.org/10.1109/SARNOF.2007.4567369","url":null,"abstract":"The major limitations of microstrip antennas (MSAs) are their narrow impedance bandwidth, small gain and low power handling capability. A half U-slot MSA with shorting wall has been designed and experimentally verified. Its center frequency is observed at 2.66 GHz. The bandwidth is 688 MHz and percentage bandwidth is 25.6% has been obtained while radiation efficiency is above 94% for the operating band. A novel design for increasing the bandwidth of a rectangular patch antenna is introduced and implemented. The design concept involves cutting an extra slot on a half U-slot MSA with shorting wall loading. This new design is very useful since it improves the bandwidth of a traditional U-slot patch antenna with an advantage of reduction in size. Measured VSWR bandwidth of 20 % and average gain of 7 dBi have been achieved. The efficiency is above 95% in the entire operating range.","PeriodicalId":293243,"journal":{"name":"2007 IEEE Sarnoff Symposium","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122731065","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: 1
Novel next generation access network architecture with optical/wireless convergence 具有光/无线融合的新一代接入网架构
2007 IEEE Sarnoff Symposium Pub Date : 2007-04-01 DOI: 10.1109/SARNOF.2007.4567374
Junqiang Hu, D. Qian, Y. Suemura, S. Nakamura, M. Cvijetic, Ting Wang
{"title":"Novel next generation access network architecture with optical/wireless convergence","authors":"Junqiang Hu, D. Qian, Y. Suemura, S. Nakamura, M. Cvijetic, Ting Wang","doi":"10.1109/SARNOF.2007.4567374","DOIUrl":"https://doi.org/10.1109/SARNOF.2007.4567374","url":null,"abstract":"Todaypsilas access network is migrating towards broadband IP, fixed/mobile convergence and service convergence. Thus, the next generation access network (NGAN) requires a converged optical/wireless access network infrastructure, other than the existing architecture that connect to the cellular, broadband wireless, and optical access networks separately, which complicate the network and increase the capital and operational expenditures (CapEx and OpEx). We have proposed a novel NGAN architecture with optical/wireless integrated edge node that elevates the connected heterogeneous access network functionalities up to the edge node [1]. In this paper, we further investigate the network and the edge node architecture and propose possible processing/operations that can decrease CapEx and OpEx to make it an attractive candidate for NGAN. In addition, we analyze the migration solution from current access network to the proposed converged network.","PeriodicalId":293243,"journal":{"name":"2007 IEEE Sarnoff Symposium","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116993017","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: 1
Cluster interactions in large 802.15.4 networks — experiments with non-acknowledged transfer 大型802.15.4网络中的集群交互——非确认传输的实验
2007 IEEE Sarnoff Symposium Pub Date : 2007-04-01 DOI: 10.1109/SARNOF.2007.4567363
R. Udayshankar, J. Misic
{"title":"Cluster interactions in large 802.15.4 networks — experiments with non-acknowledged transfer","authors":"R. Udayshankar, J. Misic","doi":"10.1109/SARNOF.2007.4567363","DOIUrl":"https://doi.org/10.1109/SARNOF.2007.4567363","url":null,"abstract":"In this paper, we evaluate network performance of non-acknowledged packet transfer in relatively large IEEE 802.15.4 network. Network under consideration contains six interconnected IEEE 802.15.4 beacon enabled network clusters in triangular topology using slave-slave (SS) bridges with CSMA-CA access. We investigate the interactions among local nodes, local bridges and remote bridges. Simulation results show graceful degradation of network performance under increasing cluster size and packet arrival rate and outperform acknowledged interconnection design.","PeriodicalId":293243,"journal":{"name":"2007 IEEE Sarnoff Symposium","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114981118","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
Channel estimation in a proposed IEEE802.11n OFDM MIMO WLAN System IEEE802.11n OFDM MIMO无线局域网系统中的信道估计
2007 IEEE Sarnoff Symposium Pub Date : 2007-04-01 DOI: 10.1109/SARNOF.2007.4567342
I. Lu, Kun-Ju Tsai
{"title":"Channel estimation in a proposed IEEE802.11n OFDM MIMO WLAN System","authors":"I. Lu, Kun-Ju Tsai","doi":"10.1109/SARNOF.2007.4567342","DOIUrl":"https://doi.org/10.1109/SARNOF.2007.4567342","url":null,"abstract":"Effects of improved channel estimation are studied for a proposed IEEE 802.11n OFDM MIMO system. Three channel estimation methods are considered: maximum likelihood (ML), time-domain truncation (TDT) and model-based (MB). TDT and MB are particularly useful when the channel delay spread is short. For an MMSE receiver, MB shows a 1-2.5 dB improvement over ML on the packet error rate performance for TGn channels B and D for various modulation and coding schemes. TDT is a simplified version of MB and shows a 1-2 dB improvement over ML at low SNRs. But improvements diminish when transmit beamforming is also employed.","PeriodicalId":293243,"journal":{"name":"2007 IEEE Sarnoff Symposium","volume":"145 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129466357","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: 21
Pricing and optimal resource allocation in next generation network services 下一代网络服务的定价与资源优化配置
2007 IEEE Sarnoff Symposium Pub Date : 2007-04-01 DOI: 10.1109/SARNOF.2007.4567398
M. Kallitsis, G. Michailidis, M. Devetsikiotis
{"title":"Pricing and optimal resource allocation in next generation network services","authors":"M. Kallitsis, G. Michailidis, M. Devetsikiotis","doi":"10.1109/SARNOF.2007.4567398","DOIUrl":"https://doi.org/10.1109/SARNOF.2007.4567398","url":null,"abstract":"In this paper, we introduce a pricing model that ensures efficient resource allocation that provides guaranteed quality of service while maximizing profit in multiservice networks. Specifically, a dynamic allocation policy is examined that relies on online measurements while each service class operates under a probabilistic bound delay constraint. We present a rigorous analysis of the properties of the policy that provides insights into its workings as well as its sensitivity to various parameters. Finally, its performance is evaluated through an extensive numerical study.","PeriodicalId":293243,"journal":{"name":"2007 IEEE Sarnoff Symposium","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121259837","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: 11
Experimental study on the performance of reduced rank timing acquisition scheme for multiple access communications 多址通信降阶定时采集方案性能的实验研究
2007 IEEE Sarnoff Symposium Pub Date : 2007-04-01 DOI: 10.1109/SARNOF.2007.4567336
Mingzheng Cao, Xiaoli Wang, H. Ge
{"title":"Experimental study on the performance of reduced rank timing acquisition scheme for multiple access communications","authors":"Mingzheng Cao, Xiaoli Wang, H. Ge","doi":"10.1109/SARNOF.2007.4567336","DOIUrl":"https://doi.org/10.1109/SARNOF.2007.4567336","url":null,"abstract":"This work studies the performance of a data-driven reduced rank scheme for rapid timing acquisition in multiple access communications. Our results show that when only a limited amount of preamble bits are available, instead of the true second-order statistics (SOS), the reduced rank scheme provides reliable timing information. Exploiting the structure of the multiple access interference, the data driven reduced-rank timing acquisition scheme demonstrates almost near-far resistant performance in signal acquisition.","PeriodicalId":293243,"journal":{"name":"2007 IEEE Sarnoff Symposium","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126371482","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
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