Pub Date : 2012-10-29DOI: 10.1109/ICCT.1996.545237
B. Honary, G. Markarian, S. Marple
We present a number of techniques which promise to make the soft-decision trellis decoding of block codes as powerful and cost effective as that of convolutional codes. The techniques are based on the concept of generalised array codes (GACs) and enable sufficient simplification in the decoding complexity.
{"title":"Trellis decoding of block codes: practical approach","authors":"B. Honary, G. Markarian, S. Marple","doi":"10.1109/ICCT.1996.545237","DOIUrl":"https://doi.org/10.1109/ICCT.1996.545237","url":null,"abstract":"We present a number of techniques which promise to make the soft-decision trellis decoding of block codes as powerful and cost effective as that of convolutional codes. The techniques are based on the concept of generalised array codes (GACs) and enable sufficient simplification in the decoding complexity.","PeriodicalId":395678,"journal":{"name":"Proceedings of International Conference on Communication Technology. ICCT '96","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124441933","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}
Pub Date : 1996-05-05DOI: 10.1109/ICCT.1996.545221
Y. Zhang, Y. Hwang, J. Sheng
China uses the longwall method in coal mining. Coal is transported by trains along a system of tunnels. Reliable and flexible mobile communications are crucial to the operation of mining and the lives of miners. We first report the experimental results of using 900 MHz indoor digital cordless telephones to provide a mobile communication service in a coal mine haulageway tunnel. The results are so encouraging that serious research is being undertaken. Research shows that mining operation does not need high capacity mobile communications. So, the simulcast multiple excitation scheme based on digital cordless telephone technology is believed to provide mine tunnels with a new alternative mobile communication approach. The principles of the simulcast multiple excitation techniques are described. In order to characterize simulcast multiple excitation tunnel radio propagation channels, the paper develops the ray-tracing propagation model for the single excitation scheme and validates the model with experimental data. Finally, the model is extended to study the propagation characteristics of simulcast signals in tunnel environments.
{"title":"Propagation characteristics of UHF simulcast signals in tunnel environments","authors":"Y. Zhang, Y. Hwang, J. Sheng","doi":"10.1109/ICCT.1996.545221","DOIUrl":"https://doi.org/10.1109/ICCT.1996.545221","url":null,"abstract":"China uses the longwall method in coal mining. Coal is transported by trains along a system of tunnels. Reliable and flexible mobile communications are crucial to the operation of mining and the lives of miners. We first report the experimental results of using 900 MHz indoor digital cordless telephones to provide a mobile communication service in a coal mine haulageway tunnel. The results are so encouraging that serious research is being undertaken. Research shows that mining operation does not need high capacity mobile communications. So, the simulcast multiple excitation scheme based on digital cordless telephone technology is believed to provide mine tunnels with a new alternative mobile communication approach. The principles of the simulcast multiple excitation techniques are described. In order to characterize simulcast multiple excitation tunnel radio propagation channels, the paper develops the ray-tracing propagation model for the single excitation scheme and validates the model with experimental data. Finally, the model is extended to study the propagation characteristics of simulcast signals in tunnel environments.","PeriodicalId":395678,"journal":{"name":"Proceedings of International Conference on Communication Technology. ICCT '96","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115291282","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}
Pub Date : 1996-05-05DOI: 10.1109/ICCT.1996.545186
C. K. Leong, R. P. Mathur, A. Craig
Satellite communication payloads for mobile communications systems require advanced digital signal processing and narrowband beamforming techniques to meet the traffic routing flexibility. The paper describes the key functions of a narrowband digital beamforming processor and summarises key aspects of development work performed at Marconi Space to demonstrate the feasibility of such a flight processor. This includes relevant ASIC designs to validate key processing algorithms, multichip modules (MCMs) to demonstrate high density packaging techniques and a flight model demonstrator to demonstrate a representative narrowband processor using the ASICs and MCMs.
{"title":"Payload digital processor hardware demonstrator for satellite communications systems","authors":"C. K. Leong, R. P. Mathur, A. Craig","doi":"10.1109/ICCT.1996.545186","DOIUrl":"https://doi.org/10.1109/ICCT.1996.545186","url":null,"abstract":"Satellite communication payloads for mobile communications systems require advanced digital signal processing and narrowband beamforming techniques to meet the traffic routing flexibility. The paper describes the key functions of a narrowband digital beamforming processor and summarises key aspects of development work performed at Marconi Space to demonstrate the feasibility of such a flight processor. This includes relevant ASIC designs to validate key processing algorithms, multichip modules (MCMs) to demonstrate high density packaging techniques and a flight model demonstrator to demonstrate a representative narrowband processor using the ASICs and MCMs.","PeriodicalId":395678,"journal":{"name":"Proceedings of International Conference on Communication Technology. ICCT '96","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115433577","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}
Pub Date : 1996-05-05DOI: 10.1109/ICCT.1996.545125
F. Muratore, G. Pennoni, G. Romano
The paper deals with a global satellite communication system for transportable briefcase-size terminals, named WAVES JOCOS (Wideband Advanced VSAT Enhanced System with Juggler Orbit COnStellation); the system is designed for operating at Ku and Ka bands and is able to offer on world-wide basis a large number of services, ranging from low data and voice to a target of 2 Mbit/s, with a fleet of light satellites. The system is based on the combination of JOCOS orbits, frequency scanning antennas and DS-CDMA technique. This combination allows to offer a modular user capacity, by covering the land masses starting from a very limited number of ICO satellites (7), to optimise the power flux density radiated from a low-power satellite and to diminish the handover requirements between spots and satellites. Moreover, WAVES JOCOS has been conceived to co-exist friendly with GEO satellite systems operating in the same frequency band, by a control of mutual interference. In particular, after a general description of the adopted orbits and of the main system features, by focusing the attention on the minimum satellite configuration, the system capability of an impressive but modular growth is introduced.
{"title":"WAVES JOCOS a new system for global satellite communications","authors":"F. Muratore, G. Pennoni, G. Romano","doi":"10.1109/ICCT.1996.545125","DOIUrl":"https://doi.org/10.1109/ICCT.1996.545125","url":null,"abstract":"The paper deals with a global satellite communication system for transportable briefcase-size terminals, named WAVES JOCOS (Wideband Advanced VSAT Enhanced System with Juggler Orbit COnStellation); the system is designed for operating at Ku and Ka bands and is able to offer on world-wide basis a large number of services, ranging from low data and voice to a target of 2 Mbit/s, with a fleet of light satellites. The system is based on the combination of JOCOS orbits, frequency scanning antennas and DS-CDMA technique. This combination allows to offer a modular user capacity, by covering the land masses starting from a very limited number of ICO satellites (7), to optimise the power flux density radiated from a low-power satellite and to diminish the handover requirements between spots and satellites. Moreover, WAVES JOCOS has been conceived to co-exist friendly with GEO satellite systems operating in the same frequency band, by a control of mutual interference. In particular, after a general description of the adopted orbits and of the main system features, by focusing the attention on the minimum satellite configuration, the system capability of an impressive but modular growth is introduced.","PeriodicalId":395678,"journal":{"name":"Proceedings of International Conference on Communication Technology. ICCT '96","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116943564","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}
Pub Date : 1996-05-05DOI: 10.1109/ICCT.1996.544969
H.R. Wu
A new generalized block-edge impairment metric (BIM) is presented in this paper as a quantitative distortion measure for the blocking artifacts in digital video, as well as digital image coding. This distortion measure only uses information contained in the reconstructed images and it is found to be consistent with subjective evaluations.
{"title":"A new distortion measure for video coding blocking artifacts","authors":"H.R. Wu","doi":"10.1109/ICCT.1996.544969","DOIUrl":"https://doi.org/10.1109/ICCT.1996.544969","url":null,"abstract":"A new generalized block-edge impairment metric (BIM) is presented in this paper as a quantitative distortion measure for the blocking artifacts in digital video, as well as digital image coding. This distortion measure only uses information contained in the reconstructed images and it is found to be consistent with subjective evaluations.","PeriodicalId":395678,"journal":{"name":"Proceedings of International Conference on Communication Technology. ICCT '96","volume":"74 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117175524","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}
Pub Date : 1996-05-05DOI: 10.1109/ICCT.1996.545135
Tie Liu, Yueming Cai, Haige Xiang
The diversity reception techniques used in multicarrier frequency-diversity spread spectrum multiple access systems (MCFD/SSMA) are researched. Due to the system architecture of the MCFD/SSMA, a frequency domain diversity receiving scheme is available in addition to the theoretically optimal RAKE receiving scheme. The former suffers an insignificant degradation of performance compared with the latter, while considerably simplifying the receiver architecture. MCFD/SSMA is a spectrum spreading method combining OFDM and CDMA techniques.
{"title":"On the diversity reception techniques in multicarrier frequency-diversity spread spectrum multiple access system","authors":"Tie Liu, Yueming Cai, Haige Xiang","doi":"10.1109/ICCT.1996.545135","DOIUrl":"https://doi.org/10.1109/ICCT.1996.545135","url":null,"abstract":"The diversity reception techniques used in multicarrier frequency-diversity spread spectrum multiple access systems (MCFD/SSMA) are researched. Due to the system architecture of the MCFD/SSMA, a frequency domain diversity receiving scheme is available in addition to the theoretically optimal RAKE receiving scheme. The former suffers an insignificant degradation of performance compared with the latter, while considerably simplifying the receiver architecture. MCFD/SSMA is a spectrum spreading method combining OFDM and CDMA techniques.","PeriodicalId":395678,"journal":{"name":"Proceedings of International Conference on Communication Technology. ICCT '96","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127141778","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}
Pub Date : 1996-05-05DOI: 10.1109/ICCT.1996.545169
Shaoqiang Chen, Fangchun Yang, Junliang Chen
The ripple effect is one of the most important causes of the difficulty of software maintenance work. This paper presents a model of the ripple effect in the SDL specification. First, some concepts are defined and a classification is made. Then ripple effects on different abstract levels of the SDL and their interactive relationships are discussed. Also the benefits due to using ripple effect analysis are described in terms that are useful to maintenance personnel and project managers.
{"title":"Ripple effect in SDL specification","authors":"Shaoqiang Chen, Fangchun Yang, Junliang Chen","doi":"10.1109/ICCT.1996.545169","DOIUrl":"https://doi.org/10.1109/ICCT.1996.545169","url":null,"abstract":"The ripple effect is one of the most important causes of the difficulty of software maintenance work. This paper presents a model of the ripple effect in the SDL specification. First, some concepts are defined and a classification is made. Then ripple effects on different abstract levels of the SDL and their interactive relationships are discussed. Also the benefits due to using ripple effect analysis are described in terms that are useful to maintenance personnel and project managers.","PeriodicalId":395678,"journal":{"name":"Proceedings of International Conference on Communication Technology. ICCT '96","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127190633","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}
Pub Date : 1996-05-05DOI: 10.1109/ICCT.1996.545233
Liu Ya-she, Liu Zengji
In this paper, we analyse the performance of an ATM switch fabric with combined-input/output buffering (C-IOB) under two different service principles for the cells at the head of line (HOL) positions of the input buffers: first come first service (FCFS)/random service (RS) for the set of HOL cells addressed to a given output port with different/same "age" (the wait time at the HOL position) and pure random service (PRS) for all HOL cells addressed to a given output port regardless of their "ages" while the queue loss (QL) transfer scheme is adopted for the interaction between the input and output buffers in the ATM switch fabric. The results obtained show that the C-IOB ATM switch fabric with PRS service policy and the QL transfer scheme is optimum among the buffering ATM switch fabrics.
{"title":"Performance analysis of ATM switch fabric with combined-input/output buffering","authors":"Liu Ya-she, Liu Zengji","doi":"10.1109/ICCT.1996.545233","DOIUrl":"https://doi.org/10.1109/ICCT.1996.545233","url":null,"abstract":"In this paper, we analyse the performance of an ATM switch fabric with combined-input/output buffering (C-IOB) under two different service principles for the cells at the head of line (HOL) positions of the input buffers: first come first service (FCFS)/random service (RS) for the set of HOL cells addressed to a given output port with different/same \"age\" (the wait time at the HOL position) and pure random service (PRS) for all HOL cells addressed to a given output port regardless of their \"ages\" while the queue loss (QL) transfer scheme is adopted for the interaction between the input and output buffers in the ATM switch fabric. The results obtained show that the C-IOB ATM switch fabric with PRS service policy and the QL transfer scheme is optimum among the buffering ATM switch fabrics.","PeriodicalId":395678,"journal":{"name":"Proceedings of International Conference on Communication Technology. ICCT '96","volume":"96 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125036585","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}
Pub Date : 1996-05-05DOI: 10.1109/ICCT.1996.545070
Zhao Dongfeng, Li Bihaiy, Zheng Sumin
Random access techniques in the packet broadcasting environment are a very important research topic. A broadcast channel is a radio packet communication channel, and the relative distances between the users and the receiver can vary greatly. Thus, packets from different transmitters arrive at the receiver with substantially different power levels. These phenomena give rise to a capture effect at the receiver. The packet arriving with the highest power level has a good chance of being detected accurately, even when other packets arrive at the same time. This capture effect improves the system throughput and other performance measures. The mean cycle times of the slotted access channel are analyzed by using the average cycle method. Analytic formulae for mean values of a successful period and a colliding period and an idle period are derived. Also, the upper bounds on the throughput of the system with capture effect are provided.
{"title":"Analysis of a slotted access channel with average cycle method","authors":"Zhao Dongfeng, Li Bihaiy, Zheng Sumin","doi":"10.1109/ICCT.1996.545070","DOIUrl":"https://doi.org/10.1109/ICCT.1996.545070","url":null,"abstract":"Random access techniques in the packet broadcasting environment are a very important research topic. A broadcast channel is a radio packet communication channel, and the relative distances between the users and the receiver can vary greatly. Thus, packets from different transmitters arrive at the receiver with substantially different power levels. These phenomena give rise to a capture effect at the receiver. The packet arriving with the highest power level has a good chance of being detected accurately, even when other packets arrive at the same time. This capture effect improves the system throughput and other performance measures. The mean cycle times of the slotted access channel are analyzed by using the average cycle method. Analytic formulae for mean values of a successful period and a colliding period and an idle period are derived. Also, the upper bounds on the throughput of the system with capture effect are provided.","PeriodicalId":395678,"journal":{"name":"Proceedings of International Conference on Communication Technology. ICCT '96","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126177503","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}
Pub Date : 1996-05-05DOI: 10.1109/ICCT.1996.545200
Lin Jiming, Yin Suozhu, Li Wenbo
A new combined matched-filter serial search PS code acquisition scheme based on surface acoustic wave (SAW) convolver preamble processing is presented in which the correct detection of preambles results in a residual uncertainty of just a few code chips, to be searched sequentially and tracked. The performance for this scheme in AWGN and single-tone interference channel is studied, considering the noise in the local reference generator. The conclusion shows that the presence of noise in the reference signal has a stronger influence on preamble processing and mean acquisition time of a system than merely reinforcing the channel noise power.
{"title":"Performance of combined SAW convolver/serial-search acquisition for DSSS system with single-tone jamming","authors":"Lin Jiming, Yin Suozhu, Li Wenbo","doi":"10.1109/ICCT.1996.545200","DOIUrl":"https://doi.org/10.1109/ICCT.1996.545200","url":null,"abstract":"A new combined matched-filter serial search PS code acquisition scheme based on surface acoustic wave (SAW) convolver preamble processing is presented in which the correct detection of preambles results in a residual uncertainty of just a few code chips, to be searched sequentially and tracked. The performance for this scheme in AWGN and single-tone interference channel is studied, considering the noise in the local reference generator. The conclusion shows that the presence of noise in the reference signal has a stronger influence on preamble processing and mean acquisition time of a system than merely reinforcing the channel noise power.","PeriodicalId":395678,"journal":{"name":"Proceedings of International Conference on Communication Technology. ICCT '96","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125365487","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}
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