IEEE Second Symposium on Communications and Vehicular Technology in the Benelux最新文献_第2页

A new approach to a wide screen signalling decoder 宽屏信号解码器的一种新方法

IEEE Second Symposium on Communications and Vehicular Technology in the Benelux Pub Date : 1994-11-02 DOI: 10.1109/SCVT.1994.574170

H. Tichelaar

{"title":"A new approach to a wide screen signalling decoder","authors":"H. Tichelaar","doi":"10.1109/SCVT.1994.574170","DOIUrl":"https://doi.org/10.1109/SCVT.1994.574170","url":null,"abstract":"Describes a new concept of a wide screen signalling decoder. Wide screen signalling (WSS) is used in 625-line television systems to transfer status information concerning the actual content of the signal to a television receiver. It is transmitted once per frame in the first half of line 23 of a composite video baseband signal (CVBS). The WSS signal contains a run-in, start-code and biphase code modulated data. The main energy of the WSS signal is in the lower video spectral domain. Although the design of the signal is based on a 5 MHz clock, the new decoder concept differs from conventional ones in that it does not use the run-in for a PLL to gain acquisition and lock, it does not use the start-code to detect WSS in line 23 and it does not establish a measure of data reliability by checking on biphase code violations. The new decoder concept does use the tail of the run-in and start-code for timing estimation, it does perform biphase code demodulation of the biphase encoded data and the data reliability is estimated by comparing the data samples with a threshold level. This threshold is determined by a measure of rms disturbance. A measure of data reliability is used to determine whether there is WSS in line 23 or not. Simulations and measurements have shown that this new concept of a WSS decoder is very robust to multiple transmission impairments which are encountered in a television channel (terrestrial, cable and satellite). This new concept WSS decoder performs quite well even when a VHS or SVHS consumer type video recorder (VCR) is used for recording and replay of the signal.","PeriodicalId":236384,"journal":{"name":"IEEE Second Symposium on Communications and Vehicular Technology in the Benelux","volume":"1984 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":"130543463","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

Concatenated coded modulation schemes for the Rayleigh fading channel 瑞利衰落信道的串联编码调制方案

IEEE Second Symposium on Communications and Vehicular Technology in the Benelux Pub Date : 1994-11-02 DOI: 10.1109/SCVT.1994.574137

S. Bounaas, J. Dany

{"title":"Concatenated coded modulation schemes for the Rayleigh fading channel","authors":"S. Bounaas, J. Dany","doi":"10.1109/SCVT.1994.574137","DOIUrl":"https://doi.org/10.1109/SCVT.1994.574137","url":null,"abstract":"The purpose of the paper is to present a performance analysis of concatenated coded modulation schemes for the Rayleigh fading channel. This structure consists of concatenated codes using Reed-Solomon and Hamming codes respectively as outer and inner codes, incorporated into a multilevel code. In order to provide a large coding gain with a minimum complexity, the authors propose a new algorithm, with reduced complexity, for soft decoding the inner code. This algorithm is named DSCR (decodage souple a complexite reduite). The advantage of the proposed suboptimal algorithm lies in the significant reduction computation complexity compared to the classical Viterbi algorithm. This is obtained by associating reliability information to each received signal. In this algorithm which is based on the Chase algorithm (Chase, 1972), the authors have developed a reliability measurement method which uses four thresholds for the decision reliability. The proposed schemes coding 8-QAM and 16-QAM, provide in average a coding gain of 12 dB over uncoded 4-QAM at bit error rate of 10/sup -3/. The overall code rate of coded 8-QAM is not the same as the uncoded 4-QAM spectral efficiency which can be easily obtained by coding 16-QAM instead. The ratio of the average complexities of the DSCR algorithm versus the hard decoding Hamming code is in the range of 2 to 3.","PeriodicalId":236384,"journal":{"name":"IEEE Second Symposium on Communications and Vehicular Technology in the Benelux","volume":"7 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":"120957017","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

QMSK modulation technique in mobile radio channel environment 移动无线电信道环境下的QMSK调制技术

IEEE Second Symposium on Communications and Vehicular Technology in the Benelux Pub Date : 1994-11-02 DOI: 10.1109/SCVT.1994.574140

T. Javornik, G. Kandus

引用次数: 0

Multiple carrier transmission with time-frequency well-localized impulses 具有时频良好局域脉冲的多载波传输

IEEE Second Symposium on Communications and Vehicular Technology in the Benelux Pub Date : 1994-11-02 DOI: 10.1109/SCVT.1994.574163

R. Haas, J. Belfiore

引用次数: 28

Co-channel interference measurement for TDMA radio mobile communication systems TDMA无线移动通信系统的同信道干扰测量

IEEE Second Symposium on Communications and Vehicular Technology in the Benelux Pub Date : 1994-11-02 DOI: 10.1109/SCVT.1994.574164

L. Husson, J. Dany

{"title":"Co-channel interference measurement for TDMA radio mobile communication systems","authors":"L. Husson, J. Dany","doi":"10.1109/SCVT.1994.574164","DOIUrl":"https://doi.org/10.1109/SCVT.1994.574164","url":null,"abstract":"In cellular radio systems, the signal is affected by co-channel interference due to frequency reuse. Power control is a technique for minimizing this co-channel interference. Recent algorithms, based on a minimum signal-to-interference ratio (SIR) requirement, need an accurate SIR measurement. A method of measuring co-channel interference for analogue mobile communication systems has previously been proposed but was restricted to pilot signals. In this paper, we extend this method by applying it directly to the received modulated signal and, therein, we improve spectral efficiency. The envelope of the received signal is affected by fluctuations which can be separated into two terms: slow fluctuations resulting of fading and fast fluctuations (at a frequency related to the bit rate) due to co-channel interference. The method exploits the possibility of separating these terms in the frequency domain in order to evaluate the signal-to-interference ratio. Extensive simulations have been carried out to analyse the measurement errors. Used modulations are 2PSK, 4PSK, GMSK and GMSK preceeded by Miller precoding that leads to the best performances. These good performances (less than 1dB error for SIR greater than 10 dB) for the estimation of signal-to-interference ratio can significantly enhance the efficiency of power control algorithms in cellular mobile radio systems.","PeriodicalId":236384,"journal":{"name":"IEEE Second Symposium on Communications and Vehicular Technology in the Benelux","volume":"17 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":"114443757","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

TCM and diversity in a Rayleigh fading channel 瑞利衰落信道中的TCM与多样性

IEEE Second Symposium on Communications and Vehicular Technology in the Benelux Pub Date : 1994-11-02 DOI: 10.1109/SCVT.1994.574138

J. Farserotu

引用次数: 1

Switched antenna diversity within a DECT system DECT系统中的切换天线分集

IEEE Second Symposium on Communications and Vehicular Technology in the Benelux Pub Date : 1994-11-02 DOI: 10.1109/SCVT.1994.574156

J.-P. van Deursen, M. Jansen

{"title":"Switched antenna diversity within a DECT system","authors":"J.-P. van Deursen, M. Jansen","doi":"10.1109/SCVT.1994.574156","DOIUrl":"https://doi.org/10.1109/SCVT.1994.574156","url":null,"abstract":"To combat the signal-degrading effects of multipath propagation in a DECT system, diversity techniques can be employed. The performance of a switched antenna diversity scheme based on received power is analyzed and compared with the performance of selection diversity for a frequency non-selective radio channel with either Rayleigh or Rician fading characteristics. Received output power statistics are chosen as performance measure. Expressions are derived for the performance of two-branch switched diversity with unequal branch statistics, antenna (space) correlation and (partial) time correlation between succeeding time samples. Results show that switched diversity performance is always inferior to selection diversity performance and that the Rice factor influences the diversity gain non-linearly. Both diversity schemes are sensitive to unequal branch statistics, while switched diversity gain deteriorates fastest. Antenna correlation does not have a large influence on the performance of switched diversity. Finally, it is also shown that the diversity gain with switched diversity is reduced considerably if there is only partial time correlation between succeeding time samples.","PeriodicalId":236384,"journal":{"name":"IEEE Second Symposium on Communications and Vehicular Technology in the Benelux","volume":"11 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":"129758496","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

Slot allocation schemes for voice and data services in a radio-mobile packet access system 无线移动分组接入系统中话音和数据业务的时隙分配方案

IEEE Second Symposium on Communications and Vehicular Technology in the Benelux Pub Date : 1994-11-02 DOI: 10.1109/SCVT.1994.574154

U. Dropmann, X. Lagrange

引用次数: 1

Physical properties of wireless infra-red systems and comparison with MMW radio systems 无线红外系统的物理特性及其与毫米波无线电系统的比较

IEEE Second Symposium on Communications and Vehicular Technology in the Benelux Pub Date : 1994-11-02 DOI: 10.1109/SCVT.1994.574151

J. Fernandes, P. Watson, J. Neves

引用次数: 0

Optical links for installation of a GSM base transceiver station 用于安装GSM基站收发器的光链路

IEEE Second Symposium on Communications and Vehicular Technology in the Benelux Pub Date : 1994-11-02 DOI: 10.1109/SCVT.1994.574169

P. Pieters, D. Duyvejonck, G. Schellemans, B. Nauwelaers, A. R. Van de Capelle

引用次数: 1