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2004 IEEE 15th International Symposium on Personal, Indoor and Mobile Radio Communications (IEEE Cat. No.04TH8754)最新文献

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Generation of perfect orthogonal complementary codes for their applications in interference-free CDMA systems 完全正交互补码的产生及其在无干扰CDMA系统中的应用
2004 IEEE 15th International Symposium on Personal, Indoor and Mobile Radio Communications (IEEE Cat. No.04TH8754) Pub Date : 2004-12-01 DOI: 10.1109/PIMRC.2004.1370967
Hsiao-Hwa Chen, Hsin-Wei Chiu
{"title":"Generation of perfect orthogonal complementary codes for their applications in interference-free CDMA systems","authors":"Hsiao-Hwa Chen, Hsin-Wei Chiu","doi":"10.1109/PIMRC.2004.1370967","DOIUrl":"https://doi.org/10.1109/PIMRC.2004.1370967","url":null,"abstract":"This paper introduces an algebraic approach to generate the super-set of perfect complementary (PC) codes suitable for interference-free CDMA applications. The code design methodology proposed herein takes into account major impairing factors in real applications, such as MAI, multipath effect, asynchronous uplink transmissions and random signs in consecutive symbols. Two important conclusions are drawn by the analysis given in this paper. First, implementation of an interference-free CDMA will never be possible unless using proper complementary code sets, such as the PC code sets proposed in this paper. Second, to enable interference-free CDMA operation, the flock size of the PC codes must be made equal to their set size. The so generated CDMA code sets can be applied to implement a new CDMA architecture offers a. performance limited only by noise.","PeriodicalId":201962,"journal":{"name":"2004 IEEE 15th International Symposium on Personal, Indoor and Mobile Radio Communications (IEEE Cat. No.04TH8754)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116474434","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: 17
Development and future applications of satellite communications 卫星通信的发展和未来应用
2004 IEEE 15th International Symposium on Personal, Indoor and Mobile Radio Communications (IEEE Cat. No.04TH8754) Pub Date : 2004-09-08 DOI: 10.1109/PIMRC.2004.1368738
E. Lutz, H. Bischl, H. Ernst, D. Giggenbach, M. Holzbock, A. Jahn, M. Werner
{"title":"Development and future applications of satellite communications","authors":"E. Lutz, H. Bischl, H. Ernst, D. Giggenbach, M. Holzbock, A. Jahn, M. Werner","doi":"10.1109/PIMRC.2004.1368738","DOIUrl":"https://doi.org/10.1109/PIMRC.2004.1368738","url":null,"abstract":"The paper describes some essential trends in the development of satellite communications and introduces promising future applications. Important developments are the set up of standards based on digital video broadcast (DVB) and the application of on-board switching taking into account quality of service (QoS). Other developments are the application of multiprotocol label switching (MPLS) to satellite networks and the usage of optical inter-satellite and inter-platform links. Seamless interworking with terrestrial wireless access networks and with terrestrial core networks is of paramount importance for the success of satellite networks. Future applications of satellite communications include aeronautical satellite communications, satellite-based air traffic management and personalised land mobile radio broadcasting.","PeriodicalId":201962,"journal":{"name":"2004 IEEE 15th International Symposium on Personal, Indoor and Mobile Radio Communications (IEEE Cat. No.04TH8754)","volume":"80 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130106786","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: 15
Study on window-based reliable multicast protocols for wireless LANs 基于窗口的无线局域网可靠组播协议研究
2004 IEEE 15th International Symposium on Personal, Indoor and Mobile Radio Communications (IEEE Cat. No.04TH8754) Pub Date : 2004-09-05 DOI: 10.1109/PIMRC.2004.1370848
H. Ferng, Pin-Chieh Yeh
{"title":"Study on window-based reliable multicast protocols for wireless LANs","authors":"H. Ferng, Pin-Chieh Yeh","doi":"10.1109/PIMRC.2004.1370848","DOIUrl":"https://doi.org/10.1109/PIMRC.2004.1370848","url":null,"abstract":"Two reliable multicast protocols for wireless local area networks (LANs) are proposed: a leader-based protocol with a sliding window, LBPW; a leader-based protocol with a sliding window and n-fold acknowledgement reduction, LBPR(n). They are based on a previously proposed leader-based protocol (LBP). Firstly, a pipelining technique is added into the LBP to form the LBPW so as to make frame transmission efficient. Then, an acknowledgement reduction scheme is incorporated into LBPW to form LBPR(n) to alleviate the ACK/NAK implosion problem. Through numerical examples done by a simulation approach, we demonstrate that these two reliable multicast protocols outperform LBP.","PeriodicalId":201962,"journal":{"name":"2004 IEEE 15th International Symposium on Personal, Indoor and Mobile Radio Communications (IEEE Cat. No.04TH8754)","volume":"74 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123065726","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
Effects of downtilting on RRM parameters 下倾对RRM参数的影响
2004 IEEE 15th International Symposium on Personal, Indoor and Mobile Radio Communications (IEEE Cat. No.04TH8754) Pub Date : 2004-09-05 DOI: 10.1109/PIMRC.2004.1368381
M. García-Lozano, S. Ruiz-Boqué
{"title":"Effects of downtilting on RRM parameters","authors":"M. García-Lozano, S. Ruiz-Boqué","doi":"10.1109/PIMRC.2004.1368381","DOIUrl":"https://doi.org/10.1109/PIMRC.2004.1368381","url":null,"abstract":"UMTS radio network planning has to deal with many parameters that simultaneously influence network performance. Their adjustment is not always an easy task since coverage, capacity and quality of service must be jointly maximized. This paper addresses the problem of adjusting antenna downtilt and its impact on the system, particularly on RRM parameters. Detailed results, furthest than well known effects, have been obtained in different scenarios with different loads by means of static Monte Carlo simulations. Adaptive and remote electrical downtilting arises as an interesting option since results show the existence of optimal configurations in which capacity is maximized. Fixed downtilt angles will lead the system to poor performance whenever scenario conditions slightly change.","PeriodicalId":201962,"journal":{"name":"2004 IEEE 15th International Symposium on Personal, Indoor and Mobile Radio Communications (IEEE Cat. No.04TH8754)","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124464165","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: 19
A frequency offset compensation method for ultra narrowband digital wireless modems 一种用于超窄带数字无线调制解调器的频偏补偿方法
2004 IEEE 15th International Symposium on Personal, Indoor and Mobile Radio Communications (IEEE Cat. No.04TH8754) Pub Date : 2004-09-05 DOI: 10.1109/PIMRC.2004.1373922
Youngjun Chong, Sung-jin You, Min-Soo Kang, Myung‐Sun Song, Seung-Hyeub Oh
{"title":"A frequency offset compensation method for ultra narrowband digital wireless modems","authors":"Youngjun Chong, Sung-jin You, Min-Soo Kang, Myung‐Sun Song, Seung-Hyeub Oh","doi":"10.1109/PIMRC.2004.1373922","DOIUrl":"https://doi.org/10.1109/PIMRC.2004.1373922","url":null,"abstract":"We evaluate the performance of the digital modulation schemes described in the APCO Project 25 FDMA specifications which can be used for applying the ultra-narrowband technology to the simple two-way radio systems, and discuss difficulties in the DSP implementation of the systems. We analyze the effect on the systems' BER performance of the frequency-offset between the transmitter and receiver oscillators. And we present a frequency offset compensation method for improving the system performance. With the frequency offset compensation method implemented in the systems using DSP, the Eb/No performance degradation of about 1.0 dB was occurred at the BER of 10/sup -3 /for 10 % of frequency offset.","PeriodicalId":201962,"journal":{"name":"2004 IEEE 15th International Symposium on Personal, Indoor and Mobile Radio Communications (IEEE Cat. No.04TH8754)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124464623","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
A playout-buffer-sensitive time slot scheduling for integration of real-time and elastic traffic in wireless networks 一种无线网络实时与弹性业务融合的播放-缓冲敏感时隙调度方法
2004 IEEE 15th International Symposium on Personal, Indoor and Mobile Radio Communications (IEEE Cat. No.04TH8754) Pub Date : 2004-09-05 DOI: 10.1109/PIMRC.2004.1373886
M. Fukushima, Hajime Nakamura, S. Nomoto
{"title":"A playout-buffer-sensitive time slot scheduling for integration of real-time and elastic traffic in wireless networks","authors":"M. Fukushima, Hajime Nakamura, S. Nomoto","doi":"10.1109/PIMRC.2004.1373886","DOIUrl":"https://doi.org/10.1109/PIMRC.2004.1373886","url":null,"abstract":"Some channel-sensitive scheduling algorithms for mobile packet systems are designed to support real-time traffic. They schedule time slots depending on the channel state and queue length in the base station. Although queue length is correlated with the QoS of real-time applications, the essential performance measure of real-time applications is the playout buffer starvation probability. This study proposes a new scheduling algorithm, the playout-buffer-sensitive (PB) rule, which can efficiently support a mixture of real-time and elastic traffic. The PB rule achieves sufficient QoS for the real-time class as well as allocating higher throughput for the best effort class than the existing algorithms. We numerically show that the efficiency of the PB rule is much closer to the theoretical upper bound than the other algorithms.","PeriodicalId":201962,"journal":{"name":"2004 IEEE 15th International Symposium on Personal, Indoor and Mobile Radio Communications (IEEE Cat. No.04TH8754)","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116670458","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: 3
Improved physical random access channel estimation in UTRA TDD 改进了UTRA TDD中的物理随机访问信道估计
2004 IEEE 15th International Symposium on Personal, Indoor and Mobile Radio Communications (IEEE Cat. No.04TH8754) Pub Date : 2004-09-05 DOI: 10.1109/PIMRC.2004.1370870
P. Darwood
{"title":"Improved physical random access channel estimation in UTRA TDD","authors":"P. Darwood","doi":"10.1109/PIMRC.2004.1370870","DOIUrl":"https://doi.org/10.1109/PIMRC.2004.1370870","url":null,"abstract":"In the Universal Mobile Telecommunications System (UMTS), a random access channel (RACH) is used to carry control information and small data packets from a mobile to the network. In particular, the RACH may be used to initiate a connection. During initial access, mobiles' timing positions are unknown to the network and, as such, their uplink transmissions carrying RACH may arrive at varying times at the base station. In UMTS terrestrial radio access (UTRA) TDD, due to the structure of a burst training sequence, this may lead to restricted cell size operation. We investigate an approach to channel estimation which removes this restriction, thus allowing UTRA TDD to operate over larger cell radii.","PeriodicalId":201962,"journal":{"name":"2004 IEEE 15th International Symposium on Personal, Indoor and Mobile Radio Communications (IEEE Cat. No.04TH8754)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117116559","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
Relation between base station characteristics and cost structure in cellular systems 蜂窝系统中基站特性与成本结构的关系
2004 IEEE 15th International Symposium on Personal, Indoor and Mobile Radio Communications (IEEE Cat. No.04TH8754) Pub Date : 2004-09-05 DOI: 10.1109/PIMRC.2004.1368795
K. Johansson, A. Furuskar, P. Karlsson, J. Zander
{"title":"Relation between base station characteristics and cost structure in cellular systems","authors":"K. Johansson, A. Furuskar, P. Karlsson, J. Zander","doi":"10.1109/PIMRC.2004.1368795","DOIUrl":"https://doi.org/10.1109/PIMRC.2004.1368795","url":null,"abstract":"A simple method for estimating the costs of building and operating a cellular mobile network is proposed. Using the empirical data from a third generation mobile system (WCDMA), it is shown that the cost is driven by different factors depending on the characteristics of the base stations deployed. When the site density increased, the operational and transmission costs tend to dominate rather than the radio equipment and site costs. The results also show how, for different capacity requirements, the costs can be minimized by a proper selection of macro, micro and pico base stations. In many scenarios, the macro base stations yield the lowest cost, indicating that the coverage (cell range) is an important parameter when designing wireless systems.","PeriodicalId":201962,"journal":{"name":"2004 IEEE 15th International Symposium on Personal, Indoor and Mobile Radio Communications (IEEE Cat. No.04TH8754)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121135042","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: 155
Turbo detection and decoding for single-carrier block transmission systems 单载波块传输系统的Turbo检测和解码
2004 IEEE 15th International Symposium on Personal, Indoor and Mobile Radio Communications (IEEE Cat. No.04TH8754) Pub Date : 2004-09-05 DOI: 10.1109/PIMRC.2004.1373881
Dongming Wang, Jingyu Hua, Xiqi Gao, X. You, M. Weckerle, E. Costa
{"title":"Turbo detection and decoding for single-carrier block transmission systems","authors":"Dongming Wang, Jingyu Hua, Xiqi Gao, X. You, M. Weckerle, E. Costa","doi":"10.1109/PIMRC.2004.1373881","DOIUrl":"https://doi.org/10.1109/PIMRC.2004.1373881","url":null,"abstract":"We study the low complexity turbo detector for cyclic prefix based single-carrier block transmission (CP-SCBT) systems with multiple receive antennas. It has the following characteristics: firstly, it can be implemented by FFT/IFFT with low complexity; secondly, along with SISO decoder, turbo detection can be applied. Simulation results show that the iterative receiver provides much better performance than the conventional CP-SCBT system. It also outperforms its coded OFDM counterpart. The most attractive advantage is that it can be implemented by FFT/IFFT without significantly increasing the complexity of the system.","PeriodicalId":201962,"journal":{"name":"2004 IEEE 15th International Symposium on Personal, Indoor and Mobile Radio Communications (IEEE Cat. No.04TH8754)","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127092094","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: 6
Assignment of multiple OVSF codes at the downlink in WCDMA WCDMA下行链路上多个OVSF码的分配
2004 IEEE 15th International Symposium on Personal, Indoor and Mobile Radio Communications (IEEE Cat. No.04TH8754) Pub Date : 2004-09-05 DOI: 10.1109/PIMRC.2004.1370912
A. Rouskas, Iraklis I. Athanasakis
{"title":"Assignment of multiple OVSF codes at the downlink in WCDMA","authors":"A. Rouskas, Iraklis I. Athanasakis","doi":"10.1109/PIMRC.2004.1370912","DOIUrl":"https://doi.org/10.1109/PIMRC.2004.1370912","url":null,"abstract":"We examine the problem of assigning multiple orthogonal variable spreading factor (OVSF) codes to serve calls at the downlink in WCDMA. In contrast to previously published approaches, we propose algorithms that fully exploit any additional hardware available at the user equipment. Depending on the requested rate and the number of available transceivers, our schemes support a call by as many OVSF codes as possible. Compared to previous multiple code assignment schemes, our approach significantly lowers code blocking. Different ways to calculate the most appropriate combination of codes result in different variations of our schemes. It turns out that if we attempt to minimize the highest rate among the codes used, instead of minimizing the excess bandwidth wasted, we get better results in terms of code blocking, and the number of reassignments to support the call.","PeriodicalId":201962,"journal":{"name":"2004 IEEE 15th International Symposium on Personal, Indoor and Mobile Radio Communications (IEEE Cat. No.04TH8754)","volume":"68 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127261566","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
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