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Vehicular Technology Conference. IEEE 55th Vehicular Technology Conference. VTC Spring 2002 (Cat. No.02CH37367)最新文献

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Performance evaluation of STC in equalized frequency selective multipath fading channel 等频选择性多径衰落信道STC性能评价
Vehicular Technology Conference. IEEE 55th Vehicular Technology Conference. VTC Spring 2002 (Cat. No.02CH37367) Pub Date : 2002-08-07 DOI: 10.1109/VTC.2002.1002877
Ping Luo, Y. Guan
{"title":"Performance evaluation of STC in equalized frequency selective multipath fading channel","authors":"Ping Luo, Y. Guan","doi":"10.1109/VTC.2002.1002877","DOIUrl":"https://doi.org/10.1109/VTC.2002.1002877","url":null,"abstract":"This paper studies and analyzes the performance of space-time coding (STC) with channel-matched Viterbi decoding in a frequency-selective multipath fading channel. Under the assumption that the perfect channel information is available to the receiver, we prove that space-time codes designed for flat fading channels can achieve additional diversity in the frequency selective multipath fading channel. Using computer simulation, the analysis results are confirmed.","PeriodicalId":159750,"journal":{"name":"Vehicular Technology Conference. IEEE 55th Vehicular Technology Conference. VTC Spring 2002 (Cat. No.02CH37367)","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129369855","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 recursive filtering technique for mobile terminal positioning in dynamic satellite systems 动态卫星系统中移动终端定位的递归滤波技术
Vehicular Technology Conference. IEEE 55th Vehicular Technology Conference. VTC Spring 2002 (Cat. No.02CH37367) Pub Date : 2002-08-07 DOI: 10.1109/VTC.2002.1002941
R. Álvarez, R. Tafazolli, B. Evans
{"title":"A recursive filtering technique for mobile terminal positioning in dynamic satellite systems","authors":"R. Álvarez, R. Tafazolli, B. Evans","doi":"10.1109/VTC.2002.1002941","DOIUrl":"https://doi.org/10.1109/VTC.2002.1002941","url":null,"abstract":"User position information is an important factor for achieving efficient operation of global wireless networks. An accurate estimation of the mobile terminal (MT) location cannot be obtained if the radio signals are corrupted by noise or other sources of signal degradation. As a consequence, processing algorithms capable of generating a single point of interception from many noisy samples need to be implemented. Simulation results presented in this paper demonstrate that a simple and computational efficient recursive filtering technique is effective in reducing the uncertainty introduced by measurement noise in the user location estimate produced by CDMA-based dynamic satellite systems.","PeriodicalId":159750,"journal":{"name":"Vehicular Technology Conference. IEEE 55th Vehicular Technology Conference. VTC Spring 2002 (Cat. No.02CH37367)","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127051339","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
A scattering model based approach to NLOS mitigation in TOA location systems 基于散射模型的TOA定位系统NLOS缓解方法
Vehicular Technology Conference. IEEE 55th Vehicular Technology Conference. VTC Spring 2002 (Cat. No.02CH37367) Pub Date : 2002-08-07 DOI: 10.1109/VTC.2002.1002610
S. Al-Jazzar, J. Caffery, Heung-Ryeol You
{"title":"A scattering model based approach to NLOS mitigation in TOA location systems","authors":"S. Al-Jazzar, J. Caffery, Heung-Ryeol You","doi":"10.1109/VTC.2002.1002610","DOIUrl":"https://doi.org/10.1109/VTC.2002.1002610","url":null,"abstract":"We present a novel approach for reducing the effect of non-line-of-sight (NLOS) error that inhibits accurate location of wireless mobile stations (MSs). The location algorithm is developed based on the distribution of times of arrival (TOAs) generated from multipath scattering models that have been published in the literature. By matching the statistics of the measured TOAs of several multipath arrivals with those produced by the scattering models, estimates of the line-of-sight (LOS) TOAs between each base station (BS) and the MS are obtained. The LOS TOAs can then be used in any traditional TOA location algorithm. The algorithm shows a significant improvement in location accuracy for a TOA system in NLOS environment.","PeriodicalId":159750,"journal":{"name":"Vehicular Technology Conference. IEEE 55th Vehicular Technology Conference. VTC Spring 2002 (Cat. No.02CH37367)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127068892","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: 155
Hardware implementation of Log-MAP turbo decoder for W-CDMA Node B with CRC-aided early stopping 带crc辅助提前停止的W-CDMA B节点Log-MAP turbo解码器的硬件实现
Vehicular Technology Conference. IEEE 55th Vehicular Technology Conference. VTC Spring 2002 (Cat. No.02CH37367) Pub Date : 2002-08-07 DOI: 10.1109/VTC.2002.1002642
Chunlong Bai, Jun Jiang, Ping Zhang
{"title":"Hardware implementation of Log-MAP turbo decoder for W-CDMA Node B with CRC-aided early stopping","authors":"Chunlong Bai, Jun Jiang, Ping Zhang","doi":"10.1109/VTC.2002.1002642","DOIUrl":"https://doi.org/10.1109/VTC.2002.1002642","url":null,"abstract":"Based on the coding/multiplexing scenario specified for W-CDMA FDD (wideband-code division multiple access, frequency division duplex), CRC (cyclic redundancy check)-aided early stopping method is chosen for hardware implementation of the Log-MAP (logarithm-maximum a posteriori) turbo decoder for use in W-CDMA Node B. Modifications to decoder structure for efficient incorporation of the CRC-aided method are proposed. With negligible cost and no performance degradation, our modified decoder works more efficiently.","PeriodicalId":159750,"journal":{"name":"Vehicular Technology Conference. IEEE 55th Vehicular Technology Conference. VTC Spring 2002 (Cat. No.02CH37367)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127455055","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
Supporting quality of service in multiple heterogeneous wireless networks 支持多种异构无线网络的服务质量
Vehicular Technology Conference. IEEE 55th Vehicular Technology Conference. VTC Spring 2002 (Cat. No.02CH37367) Pub Date : 2002-08-07 DOI: 10.1109/VTC.2002.1002629
R. Jain, U. Varshney
{"title":"Supporting quality of service in multiple heterogeneous wireless networks","authors":"R. Jain, U. Varshney","doi":"10.1109/VTC.2002.1002629","DOIUrl":"https://doi.org/10.1109/VTC.2002.1002629","url":null,"abstract":"As users become mobile across multiple heterogeneous wireless networks, supporting quality of service across such networks becomes an important issue. In this paper, we present several different QoS schemes designed for allowing QoS support among multiple heterogeneous wireless networks. Fault-tolerant architectures are also introduced to provide continued QoS support in the case of network failures. In addition to an overlay or hierarchical wireless architecture, we believe that it may be possible to achieve a certain level of fault tolerance by allowing users to access one of several wireless networks. Such a level of fault tolerance is likely to be time and location-dependent. A simulation model has been developed to evaluate the effectiveness of various fault-tolerant architectures and schemes in terms of QoS improvement. The simulation model will be extended to grow into a network simulator for designing wireless networks with a certain QoS guarantees.","PeriodicalId":159750,"journal":{"name":"Vehicular Technology Conference. IEEE 55th Vehicular Technology Conference. VTC Spring 2002 (Cat. No.02CH37367)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127463559","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
A 2.45 GHz digital beam-forming antenna for RFID reader 一种用于RFID阅读器的2.45 GHz数字波束形成天线
Vehicular Technology Conference. IEEE 55th Vehicular Technology Conference. VTC Spring 2002 (Cat. No.02CH37367) Pub Date : 2002-08-07 DOI: 10.1109/VTC.2002.1002924
Esa-Pekka Salonen, L. Sydänheimo
{"title":"A 2.45 GHz digital beam-forming antenna for RFID reader","authors":"Esa-Pekka Salonen, L. Sydänheimo","doi":"10.1109/VTC.2002.1002924","DOIUrl":"https://doi.org/10.1109/VTC.2002.1002924","url":null,"abstract":"Spatial filtering using adaptive or smart antennas has emerged as a promising technique to improve the performance of cellular mobile systems. Due to the digital nature of the control of spatial filtering a quantization error is readily present. This is due to the fact that weights and phase information is provided with the aid of finite wordlength processors. This paper presents the development of a five-element digital beam-forming antenna for RFID (radio frequency identification) reader operating on the 2.4 GHz ISM-band. The paper presents a detailed description of the operation of beam-form control including the analysis of 4-bit phase shifters. In addition, the result shows that the quantization error, even if it small, can degrade the pattern so dramatically making it unacceptable. However, we show that with as low number of control bits as four the desired radiation characteristics can be achieved.","PeriodicalId":159750,"journal":{"name":"Vehicular Technology Conference. IEEE 55th Vehicular Technology Conference. VTC Spring 2002 (Cat. No.02CH37367)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129979025","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: 25
Blind frequency offset recovery in fading channels 衰落信道中的盲频偏恢复
Vehicular Technology Conference. IEEE 55th Vehicular Technology Conference. VTC Spring 2002 (Cat. No.02CH37367) Pub Date : 2002-08-07 DOI: 10.1109/VTC.2002.1002828
Mengtao Yuan, Minjian Zhao, Shiju Li, Peiliang Qiu
{"title":"Blind frequency offset recovery in fading channels","authors":"Mengtao Yuan, Minjian Zhao, Shiju Li, Peiliang Qiu","doi":"10.1109/VTC.2002.1002828","DOIUrl":"https://doi.org/10.1109/VTC.2002.1002828","url":null,"abstract":"The paper considers a blind (non-data aided) and open-loop algorithm to estimate frequency offset of a linearly modulated waveform transmitted through fading channels. This method is based on second-order cyclostationarity, and can be used not only in time-selective channels, but also in frequency-selective fading channels. It does not rely on the Gaussian assumption of the complex equivalent low-pass channel process, and does not require the knowledge of the channel. Performance analysis of the proposed algorithm using Monte Carlo simulations in (1) additive white Gaussian noise (AWGN) channel, (2) flat fading channel, and (3) frequency selective fading channel are also reported.","PeriodicalId":159750,"journal":{"name":"Vehicular Technology Conference. IEEE 55th Vehicular Technology Conference. VTC Spring 2002 (Cat. No.02CH37367)","volume":"66 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132096144","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
Location using LOS range estimation in NLOS environments 在NLOS环境中使用LOS距离估计进行定位
Vehicular Technology Conference. IEEE 55th Vehicular Technology Conference. VTC Spring 2002 (Cat. No.02CH37367) Pub Date : 2002-08-07 DOI: 10.1109/VTC.2002.1002609
S. Venkatraman, J. Caffery, Heung-Ryeol You
{"title":"Location using LOS range estimation in NLOS environments","authors":"S. Venkatraman, J. Caffery, Heung-Ryeol You","doi":"10.1109/VTC.2002.1002609","DOIUrl":"https://doi.org/10.1109/VTC.2002.1002609","url":null,"abstract":"We present an algorithm for mitigating the non-line-of-sight (NLOS) error that corrupts time of arrival (TOA), or range, measurements. The method uses the available data regarding the ranges and the base station (BS) layout, in conjunction with cell geometry, to adjust the measured ranges to near their true line-of-sight (LOS) values. The range adjustments are obtained by scaling the NLOS ranges using scale factors that are estimated from a constrained nonlinear optimization problem.","PeriodicalId":159750,"journal":{"name":"Vehicular Technology Conference. IEEE 55th Vehicular Technology Conference. VTC Spring 2002 (Cat. No.02CH37367)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130875513","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: 111
An error resilient JPEG 2000 for wireless applications 用于无线应用的抗错误JPEG 2000
Vehicular Technology Conference. IEEE 55th Vehicular Technology Conference. VTC Spring 2002 (Cat. No.02CH37367) Pub Date : 2002-08-07 DOI: 10.1109/VTC.2002.1002781
S. Emami
{"title":"An error resilient JPEG 2000 for wireless applications","authors":"S. Emami","doi":"10.1109/VTC.2002.1002781","DOIUrl":"https://doi.org/10.1109/VTC.2002.1002781","url":null,"abstract":"An efficient and versatile wavelet based picture compression standard, known as JPEG 2000, is under development. Since wireless multimedia is among the intended applications of this standard, JPEG 2000 has to be robust to channel errors. Our results indicate that the quality of received imagery using JPEG 2000 even with error resilient provisions could be very poor. Worst case PSNR serves as an important bench mark for comparing image transmission schemes and a larger worst case peak signal-to-noise ratio (PSNR) is preferred. We present a scheme for increasing worst case PSNR, known as transmission diversity for JPEG 2000. In TD-JPEG 2000, instead of transmitting an image at full rate, the image is transmitted twice at half rate. The image encoder and decoder structures are given and a detailed operation of the decoder based on a set of rules is provided. It is observed that the worst case PSNR improves significantly compared to conventional JPEG 2000 when our method is applied to the transmission of images over noisy channels. Additionally, subjective evaluations of the received images verify the improvements in picture quality.","PeriodicalId":159750,"journal":{"name":"Vehicular Technology Conference. IEEE 55th Vehicular Technology Conference. VTC Spring 2002 (Cat. No.02CH37367)","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130472935","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
Radio link control protocol for WCDMA based mobile satellite communication systems 基于WCDMA的移动卫星通信系统的无线链路控制协议
Vehicular Technology Conference. IEEE 55th Vehicular Technology Conference. VTC Spring 2002 (Cat. No.02CH37367) Pub Date : 2002-08-07 DOI: 10.1109/VTC.2002.1002942
Kisong Lee, Kyu-Tae Jin, D. Cho
{"title":"Radio link control protocol for WCDMA based mobile satellite communication systems","authors":"Kisong Lee, Kyu-Tae Jin, D. Cho","doi":"10.1109/VTC.2002.1002942","DOIUrl":"https://doi.org/10.1109/VTC.2002.1002942","url":null,"abstract":"In satellite communication systems, channel capacity is limited because of the limited number of satellites. In particular, uplink channel capacity is relatively low due to low-power handheld terminals, collision of many terminals, and fading by long propagation time. Also long propagation delay limits the number of data-retransmissions for real time traffic, and small capacity limits the number of data-retransmissions for non real time traffic. For these reasons, comparative studies are required in order to identify the most appropriate satellite-based RLC (radio link control) protocol for global mobile multimedia communication via LEO satellite networks. In this paper we consider two kinds of traffic, real time traffic and non real time traffic. For real time traffic, a class of adaptive error-control schemes using both the code rate of FEC and frame length based on the estimated channel state/condition are used as an RLC protocol with transparent mode or unacknowledged mode. Also, for non real time traffic, a hybrid ARQ type II/III protocol is used as an RLC protocol with acknowledged mode.","PeriodicalId":159750,"journal":{"name":"Vehicular Technology Conference. IEEE 55th Vehicular Technology Conference. VTC Spring 2002 (Cat. No.02CH37367)","volume":"108 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128875096","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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