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Gateway to 21st Century Communications Village. VTC 1999-Fall. IEEE VTS 50th Vehicular Technology Conference (Cat. No.99CH36324)最新文献

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A coding and retransmission protocol for mobile radio data transmission 一种用于移动无线电数据传输的编码和重传协议
Gateway to 21st Century Communications Village. VTC 1999-Fall. IEEE VTS 50th Vehicular Technology Conference (Cat. No.99CH36324) Pub Date : 1999-09-19 DOI: 10.1109/VETECF.1999.800133
G. Benelli, E. Costamagna, L. Favalli
{"title":"A coding and retransmission protocol for mobile radio data transmission","authors":"G. Benelli, E. Costamagna, L. Favalli","doi":"10.1109/VETECF.1999.800133","DOIUrl":"https://doi.org/10.1109/VETECF.1999.800133","url":null,"abstract":"Mobile radio systems suffer from severe channel impairments. As services are moving toward a full extension of those available over fixed networks, new coding strategies are being developed to support data traffic beside the more usual voice communication. This paper presents a modified type II hybrid FEC/ARQ protocol in which each packet to be transmitted is decomposed into sub-packets each of which can be independently tested for correctness and retransmitted if necessary. The complete coding and transmission scheme is designed to be compatible with the frame format used in GSM networks. The performances of the proposed algorithm are evaluated by computer simulation using the system specifications contained in the ETSI-GSM recommendations. Throughput comparison with a traditional selective repeat (SR) protocol is presented to support the robustness and effectiveness of the presented scheme.","PeriodicalId":355729,"journal":{"name":"Gateway to 21st Century Communications Village. VTC 1999-Fall. IEEE VTS 50th Vehicular Technology Conference (Cat. No.99CH36324)","volume":"1 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114123492","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-level 2-D RAKE receiver with symbol-level searcher beamforming 带有符号级搜索波束形成的芯片级二维RAKE接收机
Gateway to 21st Century Communications Village. VTC 1999-Fall. IEEE VTS 50th Vehicular Technology Conference (Cat. No.99CH36324) Pub Date : 1999-09-19 DOI: 10.1109/VETECF.1999.798465
K. Chang, In Soo Sohn, Kap Seok Chang
{"title":"Chip-level 2-D RAKE receiver with symbol-level searcher beamforming","authors":"K. Chang, In Soo Sohn, Kap Seok Chang","doi":"10.1109/VETECF.1999.798465","DOIUrl":"https://doi.org/10.1109/VETECF.1999.798465","url":null,"abstract":"In the coherent CDMA systems with adaptive antenna arrays, the architecture of chip-level two-dimensional (2-D) RAKE receiver with the capability of symbol-level searcher beamforming is proposed in this paper. Compared with the simple chip-level beamformer, the complexity of the proposed architecture, i.e., hybrid beamforming, is increased only 1.65 times with the improved performance of complex symbol-level beamformer.","PeriodicalId":355729,"journal":{"name":"Gateway to 21st Century Communications Village. VTC 1999-Fall. IEEE VTS 50th Vehicular Technology Conference (Cat. No.99CH36324)","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116746822","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: 8
The SECOMS project satellite service demonstration results SECOMS项目卫星服务示范成果
Gateway to 21st Century Communications Village. VTC 1999-Fall. IEEE VTS 50th Vehicular Technology Conference (Cat. No.99CH36324) Pub Date : 1999-09-19 DOI: 10.1109/VETECF.1999.800286
G. Losquadro, V. Schena
{"title":"The SECOMS project satellite service demonstration results","authors":"G. Losquadro, V. Schena","doi":"10.1109/VETECF.1999.800286","DOIUrl":"https://doi.org/10.1109/VETECF.1999.800286","url":null,"abstract":"The present paper describes the final results (and data validation) of the completed SECOMS end-to-end satellite service demonstration. The first end-to-end broadband satellite service trials at 20/30 GHz executed in Europe are described, relevant to an advanced interactive multimedia satellite system providing service on continental-wide coverage using small-sized terminals. The trial focus has been to characterise the broadband satellite links, taking into account the utilisation environment (mobile and fixed use), to validate the developed user terminal prototypes in real operating conditions and environments. Finally results are shown and described.","PeriodicalId":355729,"journal":{"name":"Gateway to 21st Century Communications Village. VTC 1999-Fall. IEEE VTS 50th Vehicular Technology Conference (Cat. No.99CH36324)","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125241872","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
Smart antenna design with millimeter wave arrays 采用毫米波阵列的智能天线设计
Gateway to 21st Century Communications Village. VTC 1999-Fall. IEEE VTS 50th Vehicular Technology Conference (Cat. No.99CH36324) Pub Date : 1999-09-19 DOI: 10.1109/VETECF.1999.801483
G. Delisle, K. Hettak
{"title":"Smart antenna design with millimeter wave arrays","authors":"G. Delisle, K. Hettak","doi":"10.1109/VETECF.1999.801483","DOIUrl":"https://doi.org/10.1109/VETECF.1999.801483","url":null,"abstract":"Intelligent antennas takes advantage of both antenna and propagation technologies. It has the potential to reduce multipath interference, increase signal to noise ratio, and introduce frequency reuse within a confined environment. Several challenges remain however in the development of intelligent antennas and one of these is the availability of efficient radiating elements interfacing with the beamformer. This paper presents therefore a development effort for a novel printed phased array antenna intended to be used in a smart base station of wideband digital indoor communication systems that could offer range extension, improved immunity to flat fading, interference suppression and spatial division multiple access (SDMA).","PeriodicalId":355729,"journal":{"name":"Gateway to 21st Century Communications Village. VTC 1999-Fall. IEEE VTS 50th Vehicular Technology Conference (Cat. No.99CH36324)","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125627071","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
Design of a variable half rate speech codec 可变半速率语音编解码器的设计
Gateway to 21st Century Communications Village. VTC 1999-Fall. IEEE VTS 50th Vehicular Technology Conference (Cat. No.99CH36324) Pub Date : 1999-09-19 DOI: 10.1109/VETECF.1999.801549
Hosang Sung, Sangwon Kang, Dongwon Lee
{"title":"Design of a variable half rate speech codec","authors":"Hosang Sung, Sangwon Kang, Dongwon Lee","doi":"10.1109/VETECF.1999.801549","DOIUrl":"https://doi.org/10.1109/VETECF.1999.801549","url":null,"abstract":"In this paper, we combined generalized analysis-by-synthesis (AbS) structure and an algebraic excitation scheme to propose a variable half rate speech codec. The proposed codec operates on the speech frame of 20 ms at a sampling rate of 8 kHz. Also we introduce an efficient voicing detection algorithm using both frame energy and acoustic parameters to detect the voiced, unvoiced and silence region. 4 kb/s speech codec for the voiced region uses the generalized AbS structure which is efficient for the low bit rate speech codec. The generalized AbS structure is used for the relaxed CELP (RCELP) and it can reduce the bitrate for the pitch information by linear interpolation of the pitch delay. LP coefficients are converted to line spectrum pairs (LSP) and quantized using a predictive 2-stage VQ. A low complexity algebraic codebook which uses a shifting method is used for the fixed codebook excitation. 4 kb/s speech codec for the unvoiced region is same as that for the voiced region, except that the latter uses an open loop pitch lag in the whole frame. Also 1 kb/s codec is designed for the silence and background noise region. Experiments show that the variable half rate codec provides the average bit rate of about 2.63 kb/s for the test sentences whose voice activity factor (VAF) is 0.47. The mean opinion score (MOS) of the proposed variable half rate codec is 3.69.","PeriodicalId":355729,"journal":{"name":"Gateway to 21st Century Communications Village. VTC 1999-Fall. IEEE VTS 50th Vehicular Technology Conference (Cat. No.99CH36324)","volume":"89 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122786438","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
Simplified methods for combining hidden Markov models and turbo codes 隐马尔可夫模型与turbo码相结合的简化方法
Gateway to 21st Century Communications Village. VTC 1999-Fall. IEEE VTS 50th Vehicular Technology Conference (Cat. No.99CH36324) Pub Date : 1999-09-19 DOI: 10.1109/VETECF.1999.801561
J. Garcia-Frais, J. Villasenor
{"title":"Simplified methods for combining hidden Markov models and turbo codes","authors":"J. Garcia-Frais, J. Villasenor","doi":"10.1109/VETECF.1999.801561","DOIUrl":"https://doi.org/10.1109/VETECF.1999.801561","url":null,"abstract":"Hidden Markov models have been widely used to statistically characterize sources and channels in communication systems. In this paper we consider their application in the context of turbo codes. We describe simplified techniques for modifying a decoder for turbo codes to incorporate the hidden Markov model. This will allow the receiver to utilize the statistical characteristics of the source or channel during the decoding process, leading to significantly improved performance relative to systems in which the Markov properties are not exploited. For the case of binary hidden Markov sources and continuous hidden Markov channels, the lack of a priori knowledge of the parameters of the model does not degrade the performance of turbo decoding since these parameters can be jointly estimated with turbo decoding.","PeriodicalId":355729,"journal":{"name":"Gateway to 21st Century Communications Village. VTC 1999-Fall. IEEE VTS 50th Vehicular Technology Conference (Cat. No.99CH36324)","volume":"63 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127669263","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: 5
Delay analysis for IP speech over GPRS 基于GPRS的IP语音延迟分析
Gateway to 21st Century Communications Village. VTC 1999-Fall. IEEE VTS 50th Vehicular Technology Conference (Cat. No.99CH36324) Pub Date : 1999-09-19 DOI: 10.1109/VETECF.1999.798445
J. Parantainen, S. Hamiti
{"title":"Delay analysis for IP speech over GPRS","authors":"J. Parantainen, S. Hamiti","doi":"10.1109/VETECF.1999.798445","DOIUrl":"https://doi.org/10.1109/VETECF.1999.798445","url":null,"abstract":"This paper presents a delay analysis for G723.1 voice packets, which are transmitted over an empty (low load) GPRS network. The work concentrates on the delays of the user plane in a conversation type voice service, which is transferred with RTP/UDP/IP protocols. Audio streaming and voice transmission without RTP/UDP/IP protocols are not considered. Transmission errors, call setup and release procedures are not taken into account.","PeriodicalId":355729,"journal":{"name":"Gateway to 21st Century Communications Village. VTC 1999-Fall. IEEE VTS 50th Vehicular Technology Conference (Cat. No.99CH36324)","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133349024","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: 12
An effective method to evaluate intermittent blocking on land vehicle satellite communications 一种评估陆地车载卫星通信间歇阻塞的有效方法
Gateway to 21st Century Communications Village. VTC 1999-Fall. IEEE VTS 50th Vehicular Technology Conference (Cat. No.99CH36324) Pub Date : 1999-09-19 DOI: 10.1109/VETECF.1999.800284
M. Takahashi, K. Kimura, M. Tanaka
{"title":"An effective method to evaluate intermittent blocking on land vehicle satellite communications","authors":"M. Takahashi, K. Kimura, M. Tanaka","doi":"10.1109/VETECF.1999.800284","DOIUrl":"https://doi.org/10.1109/VETECF.1999.800284","url":null,"abstract":"In this paper, we propose an effective method to evaluate intermittent blocking on land-mobile satellite communications. This method uses the Global Positioning System. The results suggest that EFSAT, which provides higher elevation angles to areas in middle latitudes, is more suitable for land-mobile satellite communications in urban areas than a geostationary satellite in terms of blockage by features on the ground.","PeriodicalId":355729,"journal":{"name":"Gateway to 21st Century Communications Village. VTC 1999-Fall. IEEE VTS 50th Vehicular Technology Conference (Cat. No.99CH36324)","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133766278","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: 10
Software radio structure for UMTS and second generation mobile communication systems UMTS和第二代移动通信系统的软件无线电结构
Gateway to 21st Century Communications Village. VTC 1999-Fall. IEEE VTS 50th Vehicular Technology Conference (Cat. No.99CH36324) Pub Date : 1999-09-19 DOI: 10.1109/VETECF.1999.798468
A. Wiesler, H. Schober, R. Machauer, Friedrich K. Jondral
{"title":"Software radio structure for UMTS and second generation mobile communication systems","authors":"A. Wiesler, H. Schober, R. Machauer, Friedrich K. Jondral","doi":"10.1109/VETECF.1999.798468","DOIUrl":"https://doi.org/10.1109/VETECF.1999.798468","url":null,"abstract":"The third generation mobile communication system UMTS will enable a very flexible communication technology which means variable data rates from 8 kbit/s speech up to 2 Mbit/s data transmission. But the new standard cannot replace established systems like the European GSM and DECT, instead it is planed as an expansion of the second generation systems. That means future UMTS handhelds must be able to perform second and third generation communication technologies and also seamless system handover. To enable small handhelds and fast system handover an UMTS mobile station can only be realized with a transmitter structure which is totally software programmable, a so called software radio. All baseband functions are implemented in a general, parametrized way, so that all of them can be used for the selected standards by using different parameter sets. The air interfaces of DECT, GSM and WBCDMA have been analysed and common baseband functions have been developed and implemented.","PeriodicalId":355729,"journal":{"name":"Gateway to 21st Century Communications Village. VTC 1999-Fall. IEEE VTS 50th Vehicular Technology Conference (Cat. No.99CH36324)","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133941429","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 of TDMA slot synchronisation for mobile broadband systems in 40 GHz band radio channel 40 GHz频段无线信道中移动宽带系统的TDMA时隙同步性能
Gateway to 21st Century Communications Village. VTC 1999-Fall. IEEE VTS 50th Vehicular Technology Conference (Cat. No.99CH36324) Pub Date : 1999-09-19 DOI: 10.1109/VETECF.1999.798593
A. Shibuya, N. Fukui, T. Yamauchi, H. Aikawa, N. Kikuchi, K. Murakami, T. Shikama, B. Penther
{"title":"Performance of TDMA slot synchronisation for mobile broadband systems in 40 GHz band radio channel","authors":"A. Shibuya, N. Fukui, T. Yamauchi, H. Aikawa, N. Kikuchi, K. Murakami, T. Shikama, B. Penther","doi":"10.1109/VETECF.1999.798593","DOIUrl":"https://doi.org/10.1109/VETECF.1999.798593","url":null,"abstract":"This paper addresses propagation measurements in indoor environments using the 40 GHz radio frequency and a performance of TDMA slot synchronisation under mobile broadband systems. The empirical data indicate that temporal fluctuations were observed to fit a Rician distribution in line of sight environments, on the other hand Rician and log-normal distributions were observed in obstructed radio path environments. The performance of initial acquisition for TDMA slot synchronisation was also evaluated. It shows that multipath fading gave the performance degradation when the direct paths were obstructed even if the received power level was sufficient.","PeriodicalId":355729,"journal":{"name":"Gateway to 21st Century Communications Village. VTC 1999-Fall. IEEE VTS 50th Vehicular Technology Conference (Cat. No.99CH36324)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131820766","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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