发布求助
文献互助 智能选刊 最新文献

2000 IEEE Wireless Communications and Networking Conference. Conference Record (Cat. No.00TH8540)最新文献

筛选
英文 中文
Performance analysis of different algorithms for cdma2000 antenna array system and a new multi user beamforming (MUB) algorithm cdma2000天线阵列系统中不同算法的性能分析及一种新的多用户波束形成算法
2000 IEEE Wireless Communications and Networking Conference. Conference Record (Cat. No.00TH8540) Pub Date : 2000-09-23 DOI: 10.1109/WCNC.2000.904667
A. Tarighat, B. Daneshrad
{"title":"Performance analysis of different algorithms for cdma2000 antenna array system and a new multi user beamforming (MUB) algorithm","authors":"A. Tarighat, B. Daneshrad","doi":"10.1109/WCNC.2000.904667","DOIUrl":"https://doi.org/10.1109/WCNC.2000.904667","url":null,"abstract":"In this paper, the use of base station antenna arrays in wireless code division multiple access (CDMA) systems is studied. Different beamforming algorithms are simulated based on the cdma2000 uplink physical layer specifications. The performance of these algorithms is compared as a function of the number of active users under realistic conditions. The paper also presents a post-processing multi-user-beamforming (MUB) algorithm to be applied at the base station. Simulation results show an improvement in performance after applying MUB.","PeriodicalId":404304,"journal":{"name":"2000 IEEE Wireless Communications and Networking Conference. Conference Record (Cat. No.00TH8540)","volume":"102 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122476808","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
Generalized frequency hopping OFDMA through unknown frequency-selective multipath channels 通过未知选频多径信道的广义跳频OFDMA
2000 IEEE Wireless Communications and Networking Conference. Conference Record (Cat. No.00TH8540) Pub Date : 2000-09-23 DOI: 10.1109/WCNC.2000.904600
Shengli Zhou, G. Giannakis
{"title":"Generalized frequency hopping OFDMA through unknown frequency-selective multipath channels","authors":"Shengli Zhou, G. Giannakis","doi":"10.1109/WCNC.2000.904600","DOIUrl":"https://doi.org/10.1109/WCNC.2000.904600","url":null,"abstract":"The generalized frequency hopping (GFH) OFDMA system developed in this paper permeates FH benefits to multicarrier CDMA transmissions through unknown frequency-selective multipath channels. No single user suffers from consistent fading effects and multiuser interference is eliminated by design. Constellation-irrespective channel identifiability is guaranteed, and a host of blind channel estimation algorithms are developed, trading off complexity with performance. An important variant corresponding to fast-hopping is also addressed. Performance analysis and simulation results illustrate the merits of GFH-OFDMA relative to conventional OFDMA and long code CDMA with RAKE reception.","PeriodicalId":404304,"journal":{"name":"2000 IEEE Wireless Communications and Networking Conference. Conference Record (Cat. No.00TH8540)","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122584396","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
The effects of Gaussian weighting errors in hybrid SC/MRC combiners 高斯加权误差对SC/MRC混合组合器的影响
2000 IEEE Wireless Communications and Networking Conference. Conference Record (Cat. No.00TH8540) Pub Date : 2000-09-23 DOI: 10.1109/WCNC.2000.904629
A. Annamalai, C. Tellambura
{"title":"The effects of Gaussian weighting errors in hybrid SC/MRC combiners","authors":"A. Annamalai, C. Tellambura","doi":"10.1109/WCNC.2000.904629","DOIUrl":"https://doi.org/10.1109/WCNC.2000.904629","url":null,"abstract":"The paper examines the impact of Gaussian distributed weighting errors (in the channel gain estimates used for coherent combination) on the statistics of the output of hybrid selection/maximal-ratio (SC/MRC) receiver as well as the degradation of the average symbol error rate (ASER) performance from the ideal case. New expressions for the probability density function (PDF), cumulative distribution function (CDF) and moment generating function (MGF) of the coherent hybrid SC/MRC combiner output signal-to-noise ratio (SNR) are derived. The MGF is then used to derive exact closed form ASER formulas for binary and M-ary modulations employing a nonideal hybrid SC/MRC receiver in Rayleigh fading. Results for both SC and MRC are obtained as limiting cases. The effect of the weighting errors on the outage rate of error probability and the average combined SNR are also investigated. These analytical results provide some insights into the trade-off between diversity gain and combination losses with the increasing order of diversity branches in an energy-sharing communication system.","PeriodicalId":404304,"journal":{"name":"2000 IEEE Wireless Communications and Networking Conference. Conference Record (Cat. No.00TH8540)","volume":"220 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122851682","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: 9
Soft decoding for robust video transmission 软解码，鲁棒视频传输
2000 IEEE Wireless Communications and Networking Conference. Conference Record (Cat. No.00TH8540) Pub Date : 2000-09-23 DOI: 10.1109/WCNC.2000.904626
M. Bystrom, A. Kopansky, S. Kaiser
{"title":"Soft decoding for robust video transmission","authors":"M. Bystrom, A. Kopansky, S. Kaiser","doi":"10.1109/WCNC.2000.904626","DOIUrl":"https://doi.org/10.1109/WCNC.2000.904626","url":null,"abstract":"Often compressed video can be separated into high- and low-priority data on the basis of the contribution of the data to the quality of the reconstructed video. There has been significant interest in unequal error protection (UEP) for robust video transmission. Traditional UEP methods protect the high-priority data more highly than the low-priority data, that is, they employ less powerful channel codes on the low-priority data. In this work a method of utilizing soft decoding of variable-length source codes for unequal error protection is presented. No channel coding is used on the high-priority data, instead, soft-decision decoding is employed to recover from channel errors. Results are shown using an MPEG-4 codec. These results are subjectively comparable to those obtained by using a traditional UEP method.","PeriodicalId":404304,"journal":{"name":"2000 IEEE Wireless Communications and Networking Conference. Conference Record (Cat. No.00TH8540)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114394012","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
Co-channel interference cancellation with successive cancellation in narrowband TDMA systems 窄带TDMA系统中的同信道干扰逐次消除
2000 IEEE Wireless Communications and Networking Conference. Conference Record (Cat. No.00TH8540) Pub Date : 2000-09-23 DOI: 10.1109/WCNC.2000.904776
H. Arslan, K. Molnar
{"title":"Co-channel interference cancellation with successive cancellation in narrowband TDMA systems","authors":"H. Arslan, K. Molnar","doi":"10.1109/WCNC.2000.904776","DOIUrl":"https://doi.org/10.1109/WCNC.2000.904776","url":null,"abstract":"In this paper, successive cancellation of co-channel signals is described in the context of TDMA mobile radio systems employing coherent receivers. Both symbol aligned and misaligned co-channel signals are studied. Signal separability, which is a major problem in successive cancellation of co-channel signals, is obtained using the relative timing delay between co-channel signals. Both hard and soft subtractions are examined. 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":404304,"journal":{"name":"2000 IEEE Wireless Communications and Networking Conference. Conference Record (Cat. No.00TH8540)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122056210","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
Wireless infrared in-house communications: how to achieve very high bit rates 无线红外内部通信:如何实现非常高的比特率
2000 IEEE Wireless Communications and Networking Conference. Conference Record (Cat. No.00TH8540) Pub Date : 2000-09-23 DOI: 10.1109/WCNC.2000.903939
K. Akhavan, M. Kavehrad, S. Jivkova
{"title":"Wireless infrared in-house communications: how to achieve very high bit rates","authors":"K. Akhavan, M. Kavehrad, S. Jivkova","doi":"10.1109/WCNC.2000.903939","DOIUrl":"https://doi.org/10.1109/WCNC.2000.903939","url":null,"abstract":"While use of a power efficient signaling scheme appears to be effective in compensating for inherent high path-loss associated with pure diffuse infrared links, it begins to lose its effectiveness as data rate is increased. At very high data rates, intersymbol interference (ISI) can result in a very high and sometimes irreducible power penalty, preventing the system from operating at a low bit-error probability. In this paper, we investigate a link design employing a multi-beam transmitter in conjunction with a narrow field-of-view (FOV) direction diversity receiver. The design goal is to eliminate the effect of ISI, so that power efficient signaling schemes such as pulse-position modulation (PPM) can be employed at very high data rates. It is shown that an average bit-error rate (BER) not exceeding 10/sup -9/ can be achieved within the link coverage area with more than 99% probability at bit rates up to a few hundreds of megabits per second, using transmitted power levels well below one Watt.","PeriodicalId":404304,"journal":{"name":"2000 IEEE Wireless Communications and Networking Conference. Conference Record (Cat. No.00TH8540)","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128570732","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: 11
Power control and transmit diversity in multipath CDMA systems 多径CDMA系统的功率控制与传输分集
2000 IEEE Wireless Communications and Networking Conference. Conference Record (Cat. No.00TH8540) Pub Date : 2000-09-23 DOI: 10.1109/WCNC.2000.903923
M. Saquib, H. Islam, K. S. Kumar
{"title":"Power control and transmit diversity in multipath CDMA systems","authors":"M. Saquib, H. Islam, K. S. Kumar","doi":"10.1109/WCNC.2000.903923","DOIUrl":"https://doi.org/10.1109/WCNC.2000.903923","url":null,"abstract":"We integrate power control with transmit diversity in the down-link to increase the capacity of third-generation (3-G) CDMA systems. First, we investigate the system performance by using power control with the conventional receiver. Here our goal is to minimize the total transmitted power by the system subject to the signal-to-interference ratio (SIR) requirements of users. We select the antenna weights of a user in such a way that the received power of that user is maximized. It is observed that the conventional system fails quickly to meet the SIR requirements as the number of users grows. To handle this situation, we propose an interference suppression technique with power control in the down-link. Under the proposed scheme, a base station simply employs the same weights at all the antennas and a user requires to know only its spreading sequences. In both cases, the power control algorithms are iterative, distributed and asynchronous. Convergence of those iterative algorithms have been shown for a multi-cell CDMA system. An experimental study is performed to compare the performance of both power control algorithms.","PeriodicalId":404304,"journal":{"name":"2000 IEEE Wireless Communications and Networking Conference. Conference Record (Cat. No.00TH8540)","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130483967","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
Computing the distance spectrum of space-time trellis codes 计算空时格码的距离谱
2000 IEEE Wireless Communications and Networking Conference. Conference Record (Cat. No.00TH8540) Pub Date : 2000-09-23 DOI: 10.1109/WCNC.2000.904599
D. Aktas, M. Fitz
{"title":"Computing the distance spectrum of space-time trellis codes","authors":"D. Aktas, M. Fitz","doi":"10.1109/WCNC.2000.904599","DOIUrl":"https://doi.org/10.1109/WCNC.2000.904599","url":null,"abstract":"Space-time trellis code designs mainly focus on maximizing the diversity and coding gains. However, the performance of a space-time code (frame or bit error) is also a function of its \"distance spectrum\". In this work expurgated union bounds for frame and bit error probability using the distance spectrum are derived. An efficient distance spectrum computation method which uses a reduced error state diagram is proposed. Distance spectrum results for the best recently proposed codes are presented.","PeriodicalId":404304,"journal":{"name":"2000 IEEE Wireless Communications and Networking Conference. Conference Record (Cat. No.00TH8540)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123792453","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: 60
Simulcast-based DCA scheme for unicast and multicast communications in LEO satellite networks 基于联播的低轨道卫星网络单播和多播通信DCA方案
2000 IEEE Wireless Communications and Networking Conference. Conference Record (Cat. No.00TH8540) Pub Date : 2000-09-23 DOI: 10.1109/WCNC.2000.904851
K. Boussetta, Y. Ghamri-Doudane, A. Beylot
{"title":"Simulcast-based DCA scheme for unicast and multicast communications in LEO satellite networks","authors":"K. Boussetta, Y. Ghamri-Doudane, A. Beylot","doi":"10.1109/WCNC.2000.904851","DOIUrl":"https://doi.org/10.1109/WCNC.2000.904851","url":null,"abstract":"We investigate a downlink channel assignment scheme for multipoint communications and we propose a new simulcast-based dynamic channel assignment policy for both unicast and multicast connections in LEO satellite networks. In order to reduce co-channel interference power and to avoid intersymbol interference problem, our policy is combined with a power control algorithm. Performance evaluations show that our policy compared to other policies achieve bandwidth optimization and improves the quality of service since it reduces call blocking probabilities for both unicast and multicast connections.","PeriodicalId":404304,"journal":{"name":"2000 IEEE Wireless Communications and Networking Conference. Conference Record (Cat. No.00TH8540)","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123496674","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
DS-41 and UMTS intersystem roaming DS-41和UMTS系统间漫游
2000 IEEE Wireless Communications and Networking Conference. Conference Record (Cat. No.00TH8540) Pub Date : 2000-09-23 DOI: 10.1109/WCNC.2000.904870
R. Purnadi, G. Mandyam
{"title":"DS-41 and UMTS intersystem roaming","authors":"R. Purnadi, G. Mandyam","doi":"10.1109/WCNC.2000.904870","DOIUrl":"https://doi.org/10.1109/WCNC.2000.904870","url":null,"abstract":"Currently, two 3rd-generation CDMA (code division multi access) systems have been standardized. The UMTS (Universal Mobile Telecommunication System) adopts W-CDMA (wideband CDMA) direct spread (DS) air interface and the cdma2000 system adopts the cdma2000 multicarrier (MC) air interface. Currently the UMTS system is connected to a GSM-MAP based network protocol and the cdma2000 system is connected to an ANSI-41 based network protocol. There are ongoing harmonization efforts to cross-connect the W-CDMA DS to the ANSI-41 based network (the \"DS-41\" air interface) and the cdma2000 MC to the GSM-MAP based network (the \"MC-MAP\" air interface). The DS-41 air interface uses the physical layer, link layer and the radio resource control of W-CDMA DS but uses the mobility management and call control of the cdma2000 system. On the other hand, the MC-MAP uses the physical layer, link layer and the radio resource control of cdma2000 MC but uses the mobility management and the call control of the W-CDMA DS. This paper discusses the necessary DS-41 modifications, particularly with respect to the authentication procedure. This paper also considers the authentication procedures during roaming between the DS-41 and the UMTS systems. Call flows are presented to support the studies.","PeriodicalId":404304,"journal":{"name":"2000 IEEE Wireless Communications and Networking Conference. Conference Record (Cat. No.00TH8540)","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114694165","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
首页 上一页 下一页 尾页
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整，为了账户安全，请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
请完成安全验证×
相关产品
×
本文献相关产品
联系我们：info@booksci.cn Book学术提供免费学术资源搜索服务，方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号：604180095
Book学术官方微信
小红书