IEEE Second Symposium on Communications and Vehicular Technology in the Benelux最新文献_第3页

Comparison of M/sup 2/-QAM and M-PAM VSB single-carrier systems for digital TV transmission via CATV M/sup 2/-QAM和M- pam VSB单载波数字电视有线电视传输系统的比较

IEEE Second Symposium on Communications and Vehicular Technology in the Benelux Pub Date : 1994-11-02 DOI: 10.1109/SCVT.1994.574139

M. Van Bladel, M. Moeneclaey

{"title":"Comparison of M/sup 2/-QAM and M-PAM VSB single-carrier systems for digital TV transmission via CATV","authors":"M. Van Bladel, M. Moeneclaey","doi":"10.1109/SCVT.1994.574139","DOIUrl":"https://doi.org/10.1109/SCVT.1994.574139","url":null,"abstract":"The transmission of digital TV pictures has become important topic. For terrestrial broadcasting, a multi-carrier system consisting of a large number of orthogonal carriers (orthogonal frequency division multiplexing (OFDM)) has been proposed. In geographical areas where the cable TV (CATV) distribution system is already widely spread, the CATV distribution network is the main candidate for broadcasting digital TV signals. As the impulse response duration of the CATV transmission channel is much shorter than the delay spread of the terrestrial broadcast channel and the linear distortion is much smaller, it is not evident that OFDM is still the preferred modulation for a CATV environment. The authors have previously pointed out that a single-carrier (SC) QAM system with ideal decision-feedback equalization (DFE) is about 2 dB better than OFDM, when transmitting digital TV signals over the CATV network. The present paper investigates the performance of M/sup 2/-QAM and M-PAM VSB single-carrier (SC) systems. The authors compute the degradation in SNR (as compared to a non-distorting channel) when using either ideal decision feedback equalization (with adaptive filtering) or reduced-complexity feedback equalization (with fixed filtering). They show that the performance of the reduced-complexity equalizer is sensitive to a timing offset (both QAM and VSB) and a carrier offset (VSB only). This indicates that the reduced-complexity equalizer should be used in combination with a synchronizer that carefully controls the phase of the carrier generator (VSB) and sampling clock (VSB and QAM).","PeriodicalId":236384,"journal":{"name":"IEEE Second Symposium on Communications and Vehicular Technology in the Benelux","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134143262","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

Adaptive equalization of the Rician indoor radio channels 室内无线信道的自适应均衡

IEEE Second Symposium on Communications and Vehicular Technology in the Benelux Pub Date : 1994-11-02 DOI: 10.1109/SCVT.1994.574160

A. Zigic

{"title":"Adaptive equalization of the Rician indoor radio channels","authors":"A. Zigic","doi":"10.1109/SCVT.1994.574160","DOIUrl":"https://doi.org/10.1109/SCVT.1994.574160","url":null,"abstract":"The performance of a 4-QAM indoor wireless data communication system with with adaptive equalizer is investigated. The effectiveness of using a linear and decision-feedback equalizer for Rician frequency-selective indoor channels is evaluated, compared with results obtained for equalized Rayleigh fading time-dispersive channels and, finally, contrasted to the performance of a 4-QAM modem without equalizer. The Rician fading channel model with a small Rice factor of 2 dB is taken to describe the spatial distribution of the received signal, when terminals are moved over small distances. The temporal fading, corresponding to the case of fixed terminals and motion of personnel and machinery around the terminals, is represented by a Rician fading channel with Rice factor between 6.8 and 11 dB. The effects of some important channel and system parameters on indoor communication system performance are examined and presented. The average bit error rate is used as an index of performance. Both types of equalizer give significant performance improvement compared with the case of the unequalized channel. The decision-feedback receiver surpasses the linear equalizer in performance. Actually, the equalizer is observed to decrease the bit error rate until the approximate normalized data rate values of T/sub m/R/sub b/=2.2, 1 and 0.5 for the Rice factor of 2, 6.8 and 11 dB, respectively. Both equalizers exhibited performance improvement when the ratio of signal-to-noise power is increased, though it is observed that lower values of SNR (/spl les/ 12 dB) cause the propagation of decision errors through the backward filter of the decision-feedback equalizer. A special, modified automatic clear function is designed and inserted to the backward filter of the decision-feedback equalizer to suppress the error extension effect.","PeriodicalId":236384,"journal":{"name":"IEEE Second Symposium on Communications and Vehicular Technology in the Benelux","volume":"115 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123999846","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

Stochastical modeling of signal-to-interference ratio in cellular mobile communication networks 蜂窝移动通信网络信号干扰比的随机建模

IEEE Second Symposium on Communications and Vehicular Technology in the Benelux Pub Date : 1994-11-02 DOI: 10.1109/SCVT.1994.574166

D. Huo

引用次数: 0

Generation of an altimetrical data base using a geographic information system [mobile radio planning] 使用地理信息系统生成高程数据库[移动无线电规划]

IEEE Second Symposium on Communications and Vehicular Technology in the Benelux Pub Date : 1994-11-02 DOI: 10.1109/SCVT.1994.574143

G. Bussolino, E. Gilio, E. Lo Gatto, B. Missan

{"title":"Generation of an altimetrical data base using a geographic information system [mobile radio planning]","authors":"G. Bussolino, E. Gilio, E. Lo Gatto, B. Missan","doi":"10.1109/SCVT.1994.574143","DOIUrl":"https://doi.org/10.1109/SCVT.1994.574143","url":null,"abstract":"This paper aims at illustrating a methodology of generation of an altimetrical data base for mobile radio applications and a procedure developed to manage it, using a GIS (Geographic Information System). The system uses as input a set of digitized maps in the form of contour lines and elevation points obtained from cartographic maps at different scales (1:250,000, 1:50,000 and 1:10,000), and generates a final data base in the form of a set of regular matrices of altimetrical values with an appropriate grid size. The operator is allowed to check at each step the state of the maps under development and, if necessary, to correct errors or to change parameters. After a brief introduction on the principles of GISs, it will be shown how their functions of inserting, storing and managing altimetrical data have been used to create a data base useful for electromagnetic computations and how a special user interface allows the operator to select an area on the territory and automatically generate the corresponding altimetrical matrix with a suitable grid size. Finally, a few applications are described, as computer aided tools for cellular land mobile radio networks planning, concerning documentation of radio coverages, radio link analyses, intervisibility analyses and 3-D representations, used both for technical and commercial purposes.","PeriodicalId":236384,"journal":{"name":"IEEE Second Symposium on Communications and Vehicular Technology in the Benelux","volume":"32 14","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120862813","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

Performance evaluation of MM-wave digital radio transmission 毫米波数字无线电传输性能评价

IEEE Second Symposium on Communications and Vehicular Technology in the Benelux Pub Date : 1994-11-02 DOI: 10.1109/SCVT.1994.574150

J. Fernandes, J. Nascimento, A. Gusmão, R. Dinis, J. Neves

引用次数: 6

Chip synchronization performance affected by non-ideal interpolation of bandlimited direct-sequence spread-spectrum signals 带限直接序列扩频信号非理想插值对芯片同步性能的影响

IEEE Second Symposium on Communications and Vehicular Technology in the Benelux Pub Date : 1994-11-02 DOI: 10.1109/SCVT.1994.574144

K. Bucket, M. Moeneclaey

{"title":"Chip synchronization performance affected by non-ideal interpolation of bandlimited direct-sequence spread-spectrum signals","authors":"K. Bucket, M. Moeneclaey","doi":"10.1109/SCVT.1994.574144","DOIUrl":"https://doi.org/10.1109/SCVT.1994.574144","url":null,"abstract":"Deals with the chip synchronization performance of a fully digitally implemented receiver, operating on a direct-sequence spread-spectrum signal with bandlimited (instead of rectangular) chip pulses. The considered digital receiver operates on samples of the received noisy signal, taken by a fixed clock which is not synchronized to the transmitter clock. The synchronized samples needed for the chip synchronization algorithm are computed by interpolating between the available non-synchronized samples. Because of finite memory, interpolation is non-ideal; hence, some amount of distortion is introduced, which affects the performance of the chip synchronizer. By means of theoretical analysis, the authors investigate the tracking performance of a specific non-coherent early-late chip synchronizer, assuming interpolation of orders zero one and two. They show that non-ideal interpolation can give rise to a loop noise spectrum containing spectral lines, that mainly occur near f=0 when the sampling frequency is very close to an integer multiple of the chip rate. Unless a sufficiently small loop bandwidth is chosen, the contribution of these spectral lines could dominate the tracking error variance, which then becomes much larger than for synchronized sampling.","PeriodicalId":236384,"journal":{"name":"IEEE Second Symposium on Communications and Vehicular Technology in the Benelux","volume":"110 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130255864","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

Chip synchronization of M-PSK signals on nonselective fading channels for bandlimited DS/SS CDMA systems 带宽受限DS/SS CDMA系统非选择性衰落信道上M-PSK信号的芯片同步

IEEE Second Symposium on Communications and Vehicular Technology in the Benelux Pub Date : 1994-11-02 DOI: 10.1109/SCVT.1994.574145

K. Goethals

引用次数: 0

Carrier phase jitter sensitivity for single-carrier and multi-carrier QAM systems 单载波和多载波QAM系统的载波相位抖动灵敏度

IEEE Second Symposium on Communications and Vehicular Technology in the Benelux Pub Date : 1994-11-02 DOI: 10.1109/SCVT.1994.574161

Thierry Pollet, M. Moeneclaey, I. Jeanclaude, Hikmet Sari

引用次数: 7

Investigation of mobile antenna diagrams on cochannel interference 移动天线图对共信道干扰的研究

IEEE Second Symposium on Communications and Vehicular Technology in the Benelux Pub Date : 1994-11-02 DOI: 10.1109/SCVT.1994.574165

T. Benkner, K. David

引用次数: 0

Call blocking performance for dynamic channel allocation strategies in microcellular mobile communication systems 微蜂窝移动通信系统中动态信道分配策略的呼叫阻塞性能

IEEE Second Symposium on Communications and Vehicular Technology in the Benelux Pub Date : 1994-11-02 DOI: 10.1109/SCVT.1994.574168

G. Kandus, M. Mohorčič

引用次数: 0