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ICUPC '98. IEEE 1998 International Conference on Universal Personal Communications. Conference Proceedings (Cat. No.98TH8384)最新文献

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Multiuser detection with base station diversity 多用户检测与基站分集
ICUPC '98. IEEE 1998 International Conference on Universal Personal Communications. Conference Proceedings (Cat. No.98TH8384) Pub Date : 1998-10-05 DOI: 10.1109/ICUPC.1998.733686
M. C. Valenti, B. Woerner
{"title":"Multiuser detection with base station diversity","authors":"M. C. Valenti, B. Woerner","doi":"10.1109/ICUPC.1998.733686","DOIUrl":"https://doi.org/10.1109/ICUPC.1998.733686","url":null,"abstract":"A method for combining multiuser detection with base station diversity is presented for the uplink of a multiple access network composed of K transmitters and M receivers. At each base station, a K user soft-output multiuser receiver is implemented using the log maximum a posteriori (log-MAP) algorithm. The log-likelihood ratio outputs from the M base stations are combined before a final hard decision is made. This strategy has the ability to simultaneously mitigate the detrimental effects of both multiuser interference and fading, and has the potential to extend cell range and reduce the frequency reuse distance. Simulation results are shown for a time division multiple access (TDMA) network with 3 users and 3 base stations.","PeriodicalId":341069,"journal":{"name":"ICUPC '98. IEEE 1998 International Conference on Universal Personal Communications. Conference Proceedings (Cat. No.98TH8384)","volume":"07 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124295089","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: 7
Reducing the peak to average power ratio of multicarrier signals by adaptive subcarrier selection 通过自适应子载波选择降低多载波信号的峰值平均功率比
ICUPC '98. IEEE 1998 International Conference on Universal Personal Communications. Conference Proceedings (Cat. No.98TH8384) Pub Date : 1998-10-05 DOI: 10.1109/ICUPC.1998.733646
Heiko Schmidt, K. Kammeyer
{"title":"Reducing the peak to average power ratio of multicarrier signals by adaptive subcarrier selection","authors":"Heiko Schmidt, K. Kammeyer","doi":"10.1109/ICUPC.1998.733646","DOIUrl":"https://doi.org/10.1109/ICUPC.1998.733646","url":null,"abstract":"The non-constant envelope is a fundamental problem of the OFDM multicarrier technique. In many cases, nonlinear power amplifiers with power saturation lead to a high out-of-band radiation. Another characteristic of OFDM is the influence of frequency selective fading of mobile radio channels. To overcome this effect coding schemes are required for low error rates, therefore a certain redundancy has to be introduced. This paper presents a combination of an adaptive subcarrier selection as a coding scheme with a new algorithm to reduce the out-of-band radiation, exploiting the non-information carrying subcarriers. The efficiency of this technique is demonstrated by the simulation results.","PeriodicalId":341069,"journal":{"name":"ICUPC '98. IEEE 1998 International Conference on Universal Personal Communications. Conference Proceedings (Cat. No.98TH8384)","volume":"65 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122876218","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
Matched filter bound optimization for multiuser downlink transmit beamforming 多用户下行传输波束形成的匹配滤波器绑定优化
ICUPC '98. IEEE 1998 International Conference on Universal Personal Communications. Conference Proceedings (Cat. No.98TH8384) Pub Date : 1998-10-05 DOI: 10.1109/ICUPC.1998.733054
G. Montalbano, D. Slock
{"title":"Matched filter bound optimization for multiuser downlink transmit beamforming","authors":"G. Montalbano, D. Slock","doi":"10.1109/ICUPC.1998.733054","DOIUrl":"https://doi.org/10.1109/ICUPC.1998.733054","url":null,"abstract":"This paper is devoted to the optimization of the matched filter bounds (MFB) of different co-channel users, using adaptive antenna arrays at base stations for downlink transmit beamforming in cellular mobile communication systems. We mainly consider time division multiple access (TDMA) frequency division duplexing (FDD) based systems. Note that in the case of time division duplexing (TDD), under terrain assumptions the downlink channel can be assumed to be practically the same as the uplink channel. On the contrary, when using FDD, the downlink channel can not be directly observed and estimated. That makes FDD based systems most difficult to deal with, although the proposed criteria and methods are general and suitable for both FDD and TDD. Problem formulations are provided for both spatial division multiple access (SDMA) and non-SDMA spectrum reuse techniques. Novel analytical solutions and algorithms are derived, implementation issues are discussed and simulations are provided in order to compare different approaches.","PeriodicalId":341069,"journal":{"name":"ICUPC '98. IEEE 1998 International Conference on Universal Personal Communications. Conference Proceedings (Cat. No.98TH8384)","volume":"117 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123055711","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: 39
A handoff algorithm using pattern recognition 使用模式识别的切换算法
ICUPC '98. IEEE 1998 International Conference on Universal Personal Communications. Conference Proceedings (Cat. No.98TH8384) Pub Date : 1998-10-05 DOI: 10.1109/ICUPC.1998.733067
D. Wong, D. Cox
{"title":"A handoff algorithm using pattern recognition","authors":"D. Wong, D. Cox","doi":"10.1109/ICUPC.1998.733067","DOIUrl":"https://doi.org/10.1109/ICUPC.1998.733067","url":null,"abstract":"Traditional handoff algorithms generally cannot keep both the average number of unnecessary handoffs and the handoff decision delay low. In making handoff decisions, they do not exploit the relative constancy of path loss and shadow fading effects at any given location around a base station. This information can in fact be used to improve the efficiency of handoff decision algorithms, as we do in our new handoff algorithms using pattern recognition. Handoff decision algorithms with both a negligible number of unnecessary handoffs and a negligible decision delay can therefore be realized. We compare the performance of our new algorithm with the traditional algorithms in the canonical handoff scenario, which has been extensively studied in the literature.","PeriodicalId":341069,"journal":{"name":"ICUPC '98. IEEE 1998 International Conference on Universal Personal Communications. Conference Proceedings (Cat. No.98TH8384)","volume":"132 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128524729","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
A low-complexity multiuser detector for CDMA QPSK communication systems with adaptive antenna arrays 一种用于自适应天线阵列CDMA QPSK通信系统的低复杂度多用户检测器
ICUPC '98. IEEE 1998 International Conference on Universal Personal Communications. Conference Proceedings (Cat. No.98TH8384) Pub Date : 1998-10-05 DOI: 10.1109/ICUPC.1998.733687
E. Del Re, R. Fantacci, S. Morosi, S. Marapodi
{"title":"A low-complexity multiuser detector for CDMA QPSK communication systems with adaptive antenna arrays","authors":"E. Del Re, R. Fantacci, S. Morosi, S. Marapodi","doi":"10.1109/ICUPC.1998.733687","DOIUrl":"https://doi.org/10.1109/ICUPC.1998.733687","url":null,"abstract":"This paper deals with a multiuser detector for DS-CDMA wireless communication systems. The proposed detector's main feature lies in the joint utilization of the space and time processing techniques since adaptive antenna arrays and decorrelating multiuser receiver are supposed to be used together. The complexity growth is lowered by implementing a multiuser detection technique based on the sliding window algorithm. The DS-CDMA communication system considered resorts to QPSK modulated wideband signals so that a sliding window algorithm generalization is necessary. The simulation results shown here confirm that the proposed structure is near-far resistant even in the worst fading cases. As the sensor number increases a remarkable performance improvement takes place. Besides we show that the proposed receiver allows systems to exploit completely the array introduction while maintaining an acceptable computational complexity.","PeriodicalId":341069,"journal":{"name":"ICUPC '98. IEEE 1998 International Conference on Universal Personal Communications. Conference Proceedings (Cat. No.98TH8384)","volume":"383 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116224812","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
Cellular network strategic planning methods in a service profitability analysis perspective 业务盈利能力分析视角下的蜂窝网络战略规划方法
ICUPC '98. IEEE 1998 International Conference on Universal Personal Communications. Conference Proceedings (Cat. No.98TH8384) Pub Date : 1998-10-05 DOI: 10.1109/ICUPC.1998.732839
G. Donatelli, C. Eynard, G. Liggieri, R. Rossi, G. Strocchi
{"title":"Cellular network strategic planning methods in a service profitability analysis perspective","authors":"G. Donatelli, C. Eynard, G. Liggieri, R. Rossi, G. Strocchi","doi":"10.1109/ICUPC.1998.732839","DOIUrl":"https://doi.org/10.1109/ICUPC.1998.732839","url":null,"abstract":"A methodology for cellular network strategic planning in a service profitability analysis perspective is presented. After showing the approach and the general scheme, the network model for the evaluation of the equipment development is described in detail and some examples of network element models are given. The set of models developed in this work is bound to be extended in the future in order to take into account all new resources and new services. The assumptions made for some models derive from the fact that at present the mobile network evolution is characterised by a high subscribers growth that almost in its totality only generates speech traffic, while in the future the network may radically be modified if a strong impact of data services appears. Such a situation may require the revision of some of the assumptions made. Anyway, it should be possible that only parameters are tuned and the general approach and the model require no modification. Most formulas also are likely to keep their validity. The high value of the approach is the availability of rapid and global results on economical convenience taking into account the last of the fashion of technology and service in the cellular network environment.","PeriodicalId":341069,"journal":{"name":"ICUPC '98. IEEE 1998 International Conference on Universal Personal Communications. Conference Proceedings (Cat. No.98TH8384)","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117063689","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
Multi-carrier modulation schemes for frequency-selective fading channels 频率选择性衰落信道的多载波调制方案
ICUPC '98. IEEE 1998 International Conference on Universal Personal Communications. Conference Proceedings (Cat. No.98TH8384) Pub Date : 1998-10-05 DOI: 10.1109/ICUPC.1998.733647
G. Wetzker, M. Dukek, H. Ernst, F. Jondral
{"title":"Multi-carrier modulation schemes for frequency-selective fading channels","authors":"G. Wetzker, M. Dukek, H. Ernst, F. Jondral","doi":"10.1109/ICUPC.1998.733647","DOIUrl":"https://doi.org/10.1109/ICUPC.1998.733647","url":null,"abstract":"The performance of orthogonal frequency division multiplexing (OFDM) modulation schemes using differential (DPSK-OFDM), coherent (PSK-OFDM) data modulation and multi-carrier code division multiple access (MC-CDMA) are compared for time-variant and time-invariant multipath channels. Ignoring the CDMA aspect, MC-CDMA can be viewed as a novel modulation technique. While coherent OFDM and MC-CDMA require channel equalization, differential OFDM can work without it. As a channel equalization method a new controlled equalization scheme is introduced and investigated by simulations. MC-CDMA with controlled equalization is shown to be the most suited multi-carrier modulation principle over time-variant and time-invariant frequency-selective channels.","PeriodicalId":341069,"journal":{"name":"ICUPC '98. IEEE 1998 International Conference on Universal Personal Communications. Conference Proceedings (Cat. No.98TH8384)","volume":"66 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117111347","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
A new improvement of PRMA's voice service 电讯管理局话音服务的新改进
ICUPC '98. IEEE 1998 International Conference on Universal Personal Communications. Conference Proceedings (Cat. No.98TH8384) Pub Date : 1998-10-05 DOI: 10.1109/ICUPC.1998.732826
Jingfeng Li, Shi-Yang Chen
{"title":"A new improvement of PRMA's voice service","authors":"Jingfeng Li, Shi-Yang Chen","doi":"10.1109/ICUPC.1998.732826","DOIUrl":"https://doi.org/10.1109/ICUPC.1998.732826","url":null,"abstract":"A method, which can be used in wireless ATM as a multiple access control (MAC) protocol, based on the user's demand to improve the performance of voice services is proposed. After an analysis of packet reservation multiple access (PRMA), the new method (VP-PRMA), using variable contend probability according to the actual facts, is presented. In VP-PRMA, communicating users are distinguished from new users and the system can transact with them in different ways, which is always neglected. According to the simulation, the method improves the voice performance by reducing the probability of packet dropping and the channel utilization increases.","PeriodicalId":341069,"journal":{"name":"ICUPC '98. IEEE 1998 International Conference on Universal Personal Communications. Conference Proceedings (Cat. No.98TH8384)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115370291","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
Cochannel interference cancellation within the current GSM standard 当前GSM标准内的共信道干扰消除
ICUPC '98. IEEE 1998 International Conference on Universal Personal Communications. Conference Proceedings (Cat. No.98TH8384) Pub Date : 1998-10-05 DOI: 10.1109/ICUPC.1998.733028
H. Trigui, D. Slock
{"title":"Cochannel interference cancellation within the current GSM standard","authors":"H. Trigui, D. Slock","doi":"10.1109/ICUPC.1998.733028","DOIUrl":"https://doi.org/10.1109/ICUPC.1998.733028","url":null,"abstract":"The performance of maximum likelihood sequence estimation (MLSE) is bounded (and often approximated well) by the matched filter bound (MFB). In this paper, we first show how the GMSK modulation of GSM can be linearized and reformulated to have a real symbol constellation, leading to a two-channel aspect due to the in-phase and in-quadrature components of the received signal. More channels can be added by oversampling and/or the use of multiple antennas. We present the MFB for this model in the presence of colored noise (interferers) for MLSE that employs noise correlation information (that in general may differ from the true one). We show that by properly taking into account the noise correlation leads to a much improved MFB.","PeriodicalId":341069,"journal":{"name":"ICUPC '98. IEEE 1998 International Conference on Universal Personal Communications. Conference Proceedings (Cat. No.98TH8384)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115292894","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: 50
A matrix-algebraic approach to linear hybrid interference cancellation in CDMA CDMA中线性混合干扰消除的矩阵-代数方法
ICUPC '98. IEEE 1998 International Conference on Universal Personal Communications. Conference Proceedings (Cat. No.98TH8384) Pub Date : 1998-10-05 DOI: 10.1109/ICUPC.1998.733707
S. Sun, L. Rasmussen, Teng Joon Lim, H. Sugimoto
{"title":"A matrix-algebraic approach to linear hybrid interference cancellation in CDMA","authors":"S. Sun, L. Rasmussen, Teng Joon Lim, H. Sugimoto","doi":"10.1109/ICUPC.1998.733707","DOIUrl":"https://doi.org/10.1109/ICUPC.1998.733707","url":null,"abstract":"In this paper we consider a matrix algebraic approach to a linear hybrid interference canceller (HIC). This scheme is a combination of parallel and successive cancellation. It is shown that both the single-stage and multistage linear HIC can be expressed as a one-shot linear matrix filter on the received chip-matched filtered signal vector. It is proved that if the linear HIC converges, it will converge to the decorrelating detector. The eigenvalue conditions for the convergence of the multistage schemes are then derived. It is shown by simulation that the linear HIC with four or more groups at every stage can converge. When there are only two groups, however, the detector may not always converge. In this case, a weighted cancellation structure is suggested to ensure convergence. Simulation results show that if the detector converges, the minimum BER is generally obtained before the convergence is achieved, and that the weighted structure has smaller minimum BER than the non-weighted one.","PeriodicalId":341069,"journal":{"name":"ICUPC '98. IEEE 1998 International Conference on Universal Personal Communications. Conference Proceedings (Cat. No.98TH8384)","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116049300","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
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