The advent of 3G wide area cellular systems opens up the possibility of seamless roaming for IP based applications between wired/wireless LAN environments and wide area cellular coverage areas. Mechanisms to offer differentiated QoS to the Internet are currently being developed and deployed. Wide area cellular access to the Internet will need such mechanisms to offer users a seamless experience independent of access technology. This paper addresses some of the issues with the currently evolving UMTS wide area cellular standards that are being considered to offer this seamless coverage.
{"title":"End to end QoS considerations for UMTS","authors":"T. Koh, S. Levenson, T. Walton","doi":"10.1109/ETS.2000.916515","DOIUrl":"https://doi.org/10.1109/ETS.2000.916515","url":null,"abstract":"The advent of 3G wide area cellular systems opens up the possibility of seamless roaming for IP based applications between wired/wireless LAN environments and wide area cellular coverage areas. Mechanisms to offer differentiated QoS to the Internet are currently being developed and deployed. Wide area cellular access to the Internet will need such mechanisms to offer users a seamless experience independent of access technology. This paper addresses some of the issues with the currently evolving UMTS wide area cellular standards that are being considered to offer this seamless coverage.","PeriodicalId":291027,"journal":{"name":"2000 IEEE Emerging Technologies Symposium on Broadband, Wireless Internet Access. Digest of Papers (Cat. No.00EX414)","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116958948","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}
In this paper, co-channel interference cancellation using iterative subtraction is proposed for narrow-band QPSK systems. Signal separability is obtained using both the relative timing delay between signals and the decoded bits output from the channel decoder. Cancellation after decoding results in more reliable signal subtraction, at the expense of interleaving delay. Simulation results show that a small number of iterations is required when ideal channel knowledge is assumed. Soft subtraction, where the estimated values are weighted with some reliability measure, leads to significant C/I gains for both coded and uncoded bits.
{"title":"Iterative co-channel interference cancellation in narrowband mobile radio systems","authors":"H. Arslan, K. Molnar","doi":"10.1109/ETS.2000.916511","DOIUrl":"https://doi.org/10.1109/ETS.2000.916511","url":null,"abstract":"In this paper, co-channel interference cancellation using iterative subtraction is proposed for narrow-band QPSK systems. Signal separability is obtained using both the relative timing delay between signals and the decoded bits output from the channel decoder. Cancellation after decoding results in more reliable signal subtraction, at the expense of interleaving delay. Simulation results show that a small number of iterations is required when ideal channel knowledge is assumed. Soft subtraction, where the estimated values are weighted with some reliability measure, leads to significant C/I gains for both coded and uncoded bits.","PeriodicalId":291027,"journal":{"name":"2000 IEEE Emerging Technologies Symposium on Broadband, Wireless Internet Access. Digest of Papers (Cat. No.00EX414)","volume":"192 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131957839","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}
Millimeter-wave transceivers are the critical component needed for the today's expanding fixed wireless multipoint applications. The design and fabrication, in high volume, of these transceiver units presents many challenges. Procurement of thousands of units demands a very robust, low cost design that can simultaneously meet the system requirements. The digital modulation format of modern communication systems demands better transmitter and receiver performance in the areas of linearity, phase noise, spurious emissions and amplitude flatness. Design parameters such as linearity and spurious responses are second or third order effects that are difficult to predict and control. Production of large quantities of units will result in a wide Gaussian distribution of performance which demands large margins relative to the specifications to maintain high test yields. Individual tuning of each unit would be time consuming and uneconomical. Potential design solutions to these issues are discussed along with the cost tradeoffs inherent in the different designs.
{"title":"Design challenges in the high volume manufacturing of millimeter-wave transceivers","authors":"T. Howard","doi":"10.1109/ETS.2000.916532","DOIUrl":"https://doi.org/10.1109/ETS.2000.916532","url":null,"abstract":"Millimeter-wave transceivers are the critical component needed for the today's expanding fixed wireless multipoint applications. The design and fabrication, in high volume, of these transceiver units presents many challenges. Procurement of thousands of units demands a very robust, low cost design that can simultaneously meet the system requirements. The digital modulation format of modern communication systems demands better transmitter and receiver performance in the areas of linearity, phase noise, spurious emissions and amplitude flatness. Design parameters such as linearity and spurious responses are second or third order effects that are difficult to predict and control. Production of large quantities of units will result in a wide Gaussian distribution of performance which demands large margins relative to the specifications to maintain high test yields. Individual tuning of each unit would be time consuming and uneconomical. Potential design solutions to these issues are discussed along with the cost tradeoffs inherent in the different designs.","PeriodicalId":291027,"journal":{"name":"2000 IEEE Emerging Technologies Symposium on Broadband, Wireless Internet Access. Digest of Papers (Cat. No.00EX414)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125889019","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}
P. Chow, Christoph Matthies, D. Harlow, Dan Gulliford
For wireless broadband systems to succeed as a major communication solution in the 21/sup st/ century, they must be the primary communication solution in the bandwidth range of 100 Mb/s and higher. This bandwidth range is not effectively served by copper or fiber optic networks. Key technical characteristics of a primary communication network are that it be reliable, maintainable, generally accessible, easy to deploy, cost effective, etc. This paper addresses a solution for dense deployment, which is related to the key issue of accessibility. Common questions in wireless networks are "can the customer be reached?" and "will the performance be adequate?" Technical issues are system gain versus distance and interference control for dense deployment. This paper provides in-depth analysis of interference control by studying the impact of antenna patterns, different transmit power control schemes, frequency assignment and polarization. In conclusion, consecutive point networks should be able to provide broadband communication service to any medium to large buildings in any city.
{"title":"Techniques to achieve dense deployment in broadband wireless network","authors":"P. Chow, Christoph Matthies, D. Harlow, Dan Gulliford","doi":"10.1109/ETS.2000.916531","DOIUrl":"https://doi.org/10.1109/ETS.2000.916531","url":null,"abstract":"For wireless broadband systems to succeed as a major communication solution in the 21/sup st/ century, they must be the primary communication solution in the bandwidth range of 100 Mb/s and higher. This bandwidth range is not effectively served by copper or fiber optic networks. Key technical characteristics of a primary communication network are that it be reliable, maintainable, generally accessible, easy to deploy, cost effective, etc. This paper addresses a solution for dense deployment, which is related to the key issue of accessibility. Common questions in wireless networks are \"can the customer be reached?\" and \"will the performance be adequate?\" Technical issues are system gain versus distance and interference control for dense deployment. This paper provides in-depth analysis of interference control by studying the impact of antenna patterns, different transmit power control schemes, frequency assignment and polarization. In conclusion, consecutive point networks should be able to provide broadband communication service to any medium to large buildings in any city.","PeriodicalId":291027,"journal":{"name":"2000 IEEE Emerging Technologies Symposium on Broadband, Wireless Internet Access. Digest of Papers (Cat. No.00EX414)","volume":"06 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130818167","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}
Transmit adaptive arrays (or "TX AA") have been shown previously to provide significant capacity improvements over open loop diversity techniques. This paper expands TX AA to utilize multiple antenna elements, compares the theoretical performance to open loop diversity, and examines techniques to reduce the feedback data rate. Results are presented for high data rate traffic channels operating on the third generation (3G) CDMA IS2000 1X air interface (an IS-95 CDMA family direct spread system with 1.25 MHz bandwidth). The results show that TX AA obtains substantial gain over open loop diversity, especially when 4 elements are used. The feedback reduction techniques are shown to provide significant increases in the maximum mobile velocity where TX AA can operate for a given feedback data rate.
{"title":"Further results on 3G CDMA transmit adaptive arrays","authors":"M. Harrison","doi":"10.1109/ETS.2000.916509","DOIUrl":"https://doi.org/10.1109/ETS.2000.916509","url":null,"abstract":"Transmit adaptive arrays (or \"TX AA\") have been shown previously to provide significant capacity improvements over open loop diversity techniques. This paper expands TX AA to utilize multiple antenna elements, compares the theoretical performance to open loop diversity, and examines techniques to reduce the feedback data rate. Results are presented for high data rate traffic channels operating on the third generation (3G) CDMA IS2000 1X air interface (an IS-95 CDMA family direct spread system with 1.25 MHz bandwidth). The results show that TX AA obtains substantial gain over open loop diversity, especially when 4 elements are used. The feedback reduction techniques are shown to provide significant increases in the maximum mobile velocity where TX AA can operate for a given feedback data rate.","PeriodicalId":291027,"journal":{"name":"2000 IEEE Emerging Technologies Symposium on Broadband, Wireless Internet Access. Digest of Papers (Cat. No.00EX414)","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121573524","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}
Smart antennas enable space division multiple access, that is they manage access to a network by accounting for where users are spatially and using antenna technology to better isolate signals from noise and interference. For mobile systems, the benefits are increased capacity from existing cell sites, maximum return on infrastructure investment, and improved network efficiency and performance. In mobile systems, all the benefits for base-to-mobile and mobile-to-base paths occur as a result of smart antennas being installed at the base site. For fixed wireless systems, smart antennas are practical for both the base station and the remote station (RS). This paper discusses the increase in throughput that is realized by using smart antenna technology in a fixed wireless system. The management of packet transmission and reception, a key component of maximizing capacity, is described. Also included is a discussion of the user benefits and capacity impact of smart antennas at a remote station.
{"title":"Smart antennas for broadband wireless access","authors":"M. Reudink, D. Reudink","doi":"10.1109/ETS.2000.916523","DOIUrl":"https://doi.org/10.1109/ETS.2000.916523","url":null,"abstract":"Smart antennas enable space division multiple access, that is they manage access to a network by accounting for where users are spatially and using antenna technology to better isolate signals from noise and interference. For mobile systems, the benefits are increased capacity from existing cell sites, maximum return on infrastructure investment, and improved network efficiency and performance. In mobile systems, all the benefits for base-to-mobile and mobile-to-base paths occur as a result of smart antennas being installed at the base site. For fixed wireless systems, smart antennas are practical for both the base station and the remote station (RS). This paper discusses the increase in throughput that is realized by using smart antenna technology in a fixed wireless system. The management of packet transmission and reception, a key component of maximizing capacity, is described. Also included is a discussion of the user benefits and capacity impact of smart antennas at a remote station.","PeriodicalId":291027,"journal":{"name":"2000 IEEE Emerging Technologies Symposium on Broadband, Wireless Internet Access. Digest of Papers (Cat. No.00EX414)","volume":"313 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129751187","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}
In wireless data systems, Aloha channels are often used to send requests or short messages from a mobile station to the base station receiver. This paper evaluates a slotted Aloha channel with receiver antenna diversity; packets are transmitted in randomly selected time slots. The packet success-rate is studied as it relates to the carrier to noise plus interference ratio observed in each received branch. The ReFLEX Aloha channel is simulated under slow moving fading. A single cell's throughput, packet success-rate and mean number of transmission attempts per packet are presented from the simulation. The results show that as the transmission retry limit increases, the Aloha throughput decreases and the packet reliability increases. Based on these results, the number of retries can be selected to maximize the throughput for a given packet reliability. Other performance metrics such as the mean number of transmissions and mean packet delay are presented. Although the simulation results are specific to ReFLEX systems, the analysis methods and the system optimization approach can he applied to other Aloha systems.
{"title":"Aloha channel performance in a wireless data system employing antenna diversity receivers","authors":"H. Xie, L. Dehner","doi":"10.1109/ETS.2000.916508","DOIUrl":"https://doi.org/10.1109/ETS.2000.916508","url":null,"abstract":"In wireless data systems, Aloha channels are often used to send requests or short messages from a mobile station to the base station receiver. This paper evaluates a slotted Aloha channel with receiver antenna diversity; packets are transmitted in randomly selected time slots. The packet success-rate is studied as it relates to the carrier to noise plus interference ratio observed in each received branch. The ReFLEX Aloha channel is simulated under slow moving fading. A single cell's throughput, packet success-rate and mean number of transmission attempts per packet are presented from the simulation. The results show that as the transmission retry limit increases, the Aloha throughput decreases and the packet reliability increases. Based on these results, the number of retries can be selected to maximize the throughput for a given packet reliability. Other performance metrics such as the mean number of transmissions and mean packet delay are presented. Although the simulation results are specific to ReFLEX systems, the analysis methods and the system optimization approach can he applied to other Aloha systems.","PeriodicalId":291027,"journal":{"name":"2000 IEEE Emerging Technologies Symposium on Broadband, Wireless Internet Access. Digest of Papers (Cat. No.00EX414)","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126926141","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}
The objective of the present paper is to evaluate the impact of interference on the performance of a Bluetooth network. Specifically, the interference analyzed is that from other Bluetooth networks. The study focuses on the impact of adjacent and co-channel interference on the throughput and coverage performance. Analysis and simulation data illustrate the significant difference in performance between synchronous and asynchronous systems. The paper also provides insights on how to design Bluetooth networks for maximum throughput and coverage performance.
{"title":"Performance evaluation of a Bluetooth network in the presence of adjacent and co-channel interference","authors":"S. Souissi, Eric F. Meihofer","doi":"10.1109/ETS.2000.916528","DOIUrl":"https://doi.org/10.1109/ETS.2000.916528","url":null,"abstract":"The objective of the present paper is to evaluate the impact of interference on the performance of a Bluetooth network. Specifically, the interference analyzed is that from other Bluetooth networks. The study focuses on the impact of adjacent and co-channel interference on the throughput and coverage performance. Analysis and simulation data illustrate the significant difference in performance between synchronous and asynchronous systems. The paper also provides insights on how to design Bluetooth networks for maximum throughput and coverage performance.","PeriodicalId":291027,"journal":{"name":"2000 IEEE Emerging Technologies Symposium on Broadband, Wireless Internet Access. Digest of Papers (Cat. No.00EX414)","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116622640","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}
A high efficiency amplifier has been developed for use in K-band communication systems. The 3-stage amplifier achieves an average gain of 28 dB over the frequency range of 17 to 21 GHz. Six volt operation of the amplifier attains 28 dBm of output power at 45% power added efficiency at 19.5 GHz. This is the highest power added efficiency reported to date for a high gain, 3-stage amplifier fabricated with standard production pHEMT processing. Additionally, the amplifier utilizes a highly compact layout using only 3 mm/sup 2/ of GaAs area, which minimizes chip cost in communication systems.
{"title":"High efficiency K-band amplifier for on-satellite wireless communication systems","authors":"J. Carroll, R. Flynt, S. Brown","doi":"10.1109/ETS.2000.916521","DOIUrl":"https://doi.org/10.1109/ETS.2000.916521","url":null,"abstract":"A high efficiency amplifier has been developed for use in K-band communication systems. The 3-stage amplifier achieves an average gain of 28 dB over the frequency range of 17 to 21 GHz. Six volt operation of the amplifier attains 28 dBm of output power at 45% power added efficiency at 19.5 GHz. This is the highest power added efficiency reported to date for a high gain, 3-stage amplifier fabricated with standard production pHEMT processing. Additionally, the amplifier utilizes a highly compact layout using only 3 mm/sup 2/ of GaAs area, which minimizes chip cost in communication systems.","PeriodicalId":291027,"journal":{"name":"2000 IEEE Emerging Technologies Symposium on Broadband, Wireless Internet Access. Digest of Papers (Cat. No.00EX414)","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128126465","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}
The third generation evolution paths for GSM and TDMA include a common air-interface standard entitled Enhanced Data Rates for Global Evolution (EDGE). This paper discuss the EDGE air-interface capabilities, modes, and features. It examines the frequency reuse, and link throughput capabilities for the EDGE radio interface in a TDMA network. The upper bound on the base station transceiver's (BTS) link throughput is developed based on the available spectrum and frequency groups. A case study of the coverage area with 30 BTSs in an urban environment is studied and presented for different reuse patterns. The carrier to interference ratio is modeled for worst case 100% utilization and the link throughput is estimated for the coverage area and on the cell level.
{"title":"EDGE air-interface capacity analysis","authors":"A. Ahmedi, A. Triggs, H. H'mimy","doi":"10.1109/ETS.2000.916518","DOIUrl":"https://doi.org/10.1109/ETS.2000.916518","url":null,"abstract":"The third generation evolution paths for GSM and TDMA include a common air-interface standard entitled Enhanced Data Rates for Global Evolution (EDGE). This paper discuss the EDGE air-interface capabilities, modes, and features. It examines the frequency reuse, and link throughput capabilities for the EDGE radio interface in a TDMA network. The upper bound on the base station transceiver's (BTS) link throughput is developed based on the available spectrum and frequency groups. A case study of the coverage area with 30 BTSs in an urban environment is studied and presented for different reuse patterns. The carrier to interference ratio is modeled for worst case 100% utilization and the link throughput is estimated for the coverage area and on the cell level.","PeriodicalId":291027,"journal":{"name":"2000 IEEE Emerging Technologies Symposium on Broadband, Wireless Internet Access. Digest of Papers (Cat. No.00EX414)","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133823967","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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