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IEEE 54th Vehicular Technology Conference. VTC Fall 2001. Proceedings (Cat. No.01CH37211)最新文献

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Packet data capacity in an integrated network 综合网络中的分组数据容量
IEEE 54th Vehicular Technology Conference. VTC Fall 2001. Proceedings (Cat. No.01CH37211) Pub Date : 2001-10-07 DOI: 10.1109/VTC.2001.956525
S. Lincke, C. Hood
{"title":"Packet data capacity in an integrated network","authors":"S. Lincke, C. Hood","doi":"10.1109/VTC.2001.956525","DOIUrl":"https://doi.org/10.1109/VTC.2001.956525","url":null,"abstract":"The challenge for 3G cellular is not only to support varied services at speeds to 2 Mbit/s, but to support these services efficiently and with good quality. A method to optimize the capacity available to high-speed data is to consider placing dual mode circuit-switched calls on an alternate cellular network (ie, 2G or 3G). For a mature UMTS network with high data demand, more capacity becomes available for 3G packet (and high-rate circuit) data, if dual mode 3G speech is preferably placed on the GSM network Our integrated network solution shows that 2G telephones may be serviced fairly, by overflowing calls between the 2G and 3G networks, if the 2G network is at capacity.","PeriodicalId":129008,"journal":{"name":"IEEE 54th Vehicular Technology Conference. VTC Fall 2001. Proceedings (Cat. No.01CH37211)","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121267863","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: 5
Uplink channel estimation for IMT-DS system IMT-DS系统上行信道估计
IEEE 54th Vehicular Technology Conference. VTC Fall 2001. Proceedings (Cat. No.01CH37211) Pub Date : 2001-10-07 DOI: 10.1109/VTC.2001.957188
A. Sheikh, S. Shah
{"title":"Uplink channel estimation for IMT-DS system","authors":"A. Sheikh, S. Shah","doi":"10.1109/VTC.2001.957188","DOIUrl":"https://doi.org/10.1109/VTC.2001.957188","url":null,"abstract":"The IMT-DS system is one of the approved 3G radio interface standards which employ RAKE receivers to exploit multipath diversity. This paper discusses a new dimension in DS-CDMA channel estimation, i.e., chip-level adaptive channel estimation. A novel despreader-respreader based channel estimator (DRCE) is proposed to obtain uplink (UL) channel estimates at chip-level which resolves the deficiencies of conventional methods that work at symbol level. The DRCE employs an adaptive filter whose weights are adapted by using an LMS algorithm. The performance of the RAKE receiver with DRCE for an IMT-DS system is evaluated in terms of BER by simulations for pedestrian and vehicular channels.","PeriodicalId":129008,"journal":{"name":"IEEE 54th Vehicular Technology Conference. VTC Fall 2001. Proceedings (Cat. No.01CH37211)","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127623953","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
Frequency shift based multiple access interference canceller for DS-CDMA systems 基于移频的DS-CDMA系统多址干扰消除器
IEEE 54th Vehicular Technology Conference. VTC Fall 2001. Proceedings (Cat. No.01CH37211) Pub Date : 2001-10-07 DOI: 10.1109/VTC.2001.957195
L. Gonçalves, Adão Silva, A. Gameiro
{"title":"Frequency shift based multiple access interference canceller for DS-CDMA systems","authors":"L. Gonçalves, Adão Silva, A. Gameiro","doi":"10.1109/VTC.2001.957195","DOIUrl":"https://doi.org/10.1109/VTC.2001.957195","url":null,"abstract":"The cyclostationary properties of direct sequence spread spectrum signals are well known. These cyclostationary properties imply a redundancy between frequency components separated by multiples of the symbol rate. We present a multiple access interference canceller that explores this property and applies it to UMTS-TDD. This frequency domain canceller acts on the spread signal in such a way that minimizes the interference and noise at its output (minimum mean squared error criterium). The performance is evaluated in two detector configurations: one including the frequency shift canceller (FSC) and the other plus a parallel interference canceller (PIC). The results are benchmarked against the performance of the conventional RAKE detector and the conventional PIC detector.","PeriodicalId":129008,"journal":{"name":"IEEE 54th Vehicular Technology Conference. VTC Fall 2001. Proceedings (Cat. No.01CH37211)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127928008","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: 5
Spectral sensitivity of predistortion linearizer architectures to filter ripple 预失真线性器结构对滤波纹波的光谱灵敏度
IEEE 54th Vehicular Technology Conference. VTC Fall 2001. Proceedings (Cat. No.01CH37211) Pub Date : 2001-10-07 DOI: 10.1109/VTC.2001.956462
W. Shan, Lars Sundström, B. Shi
{"title":"Spectral sensitivity of predistortion linearizer architectures to filter ripple","authors":"W. Shan, Lars Sundström, B. Shi","doi":"10.1109/VTC.2001.956462","DOIUrl":"https://doi.org/10.1109/VTC.2001.956462","url":null,"abstract":"Multi-carrier power amplifiers (PA) used in cellular base stations have very high linearity requirement. Predistortion is a powerful method for linearization of RF PA. But linearity performance of a predistortion system is limited by various memory effects. We investigate the effects of filters between the predistorter and the PA. These effects are studied by means of analysis and simulation for multi-carrier signals. A method is developed that can be used to estimate the output spectrum based on the filter transfer function and the nonlinearity of the PA.","PeriodicalId":129008,"journal":{"name":"IEEE 54th Vehicular Technology Conference. VTC Fall 2001. Proceedings (Cat. No.01CH37211)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133219211","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
Decoupled space-time processing: performance evaluation for a TDMA system 解耦时空处理:时分多址系统的性能评估
IEEE 54th Vehicular Technology Conference. VTC Fall 2001. Proceedings (Cat. No.01CH37211) Pub Date : 2001-10-07 DOI: 10.1109/VTC.2001.957094
C. Panazio, F. Cavalcanti
{"title":"Decoupled space-time processing: performance evaluation for a TDMA system","authors":"C. Panazio, F. Cavalcanti","doi":"10.1109/VTC.2001.957094","DOIUrl":"https://doi.org/10.1109/VTC.2001.957094","url":null,"abstract":"We investigate the performance of a decoupled space-time processing technique in a TDMA cellular system. This structure has, as its main characteristic, the possibility of giving more degrees of freedom to an antenna array, and it can thereby provide better cochannel interference cancellation. We analyze its performance by link-level simulations and its sensitivity for parameters like delay spread, path angle separation and signal-to-interference ratio. The results show that the decoupled space-time structure can outperform the conventional linear space-time structure, especially in cases with a high level of cochannel interference.","PeriodicalId":129008,"journal":{"name":"IEEE 54th Vehicular Technology Conference. VTC Fall 2001. Proceedings (Cat. No.01CH37211)","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133272787","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
Design and implementation of a radio resource control protocol in WCDMA using SDL 基于SDL的WCDMA无线资源控制协议的设计与实现
IEEE 54th Vehicular Technology Conference. VTC Fall 2001. Proceedings (Cat. No.01CH37211) Pub Date : 2001-10-07 DOI: 10.1109/VTC.2001.956922
Kwang-Ryul Jung, Jihyuk Choi, Pyeongjung Song, Young-Ho Nam
{"title":"Design and implementation of a radio resource control protocol in WCDMA using SDL","authors":"Kwang-Ryul Jung, Jihyuk Choi, Pyeongjung Song, Young-Ho Nam","doi":"10.1109/VTC.2001.956922","DOIUrl":"https://doi.org/10.1109/VTC.2001.956922","url":null,"abstract":"In wideband code division multiple access (WCDMA), most of the control signalling between mobile terminal (ie, user equipment) and base station (ie, radio network controller) is made up of messages of the radio resource control (RRC) protocol. The Specification and Description Language (SDL) development of a WCDMA RRC protocol is presented. SDL is a high abstraction level system design language with a clear graphic notation.","PeriodicalId":129008,"journal":{"name":"IEEE 54th Vehicular Technology Conference. VTC Fall 2001. Proceedings (Cat. No.01CH37211)","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133704039","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: 4
A matched filter approximation for SC/MMSE iterative equalizers SC/MMSE迭代均衡器的匹配滤波近似
IEEE 54th Vehicular Technology Conference. VTC Fall 2001. Proceedings (Cat. No.01CH37211) Pub Date : 2001-10-07 DOI: 10.1109/VTC.2001.956535
H. Omori, T. Asai, T. Matsumoto
{"title":"A matched filter approximation for SC/MMSE iterative equalizers","authors":"H. Omori, T. Asai, T. Matsumoto","doi":"10.1109/VTC.2001.956535","DOIUrl":"https://doi.org/10.1109/VTC.2001.956535","url":null,"abstract":"This paper proposes a new iterative ISI equalization algorithm that offers low computational complexity: order L/sup 2/ with channel memory length L. The proposed algorithm is an extension of D. Reynolds and Xiaodong Wang's SC/MMSE (soft canceller followed by MMSE filter) equalizer (see Signal Processing, vol.81, no.5, p.989-95, 2001): approximations are used properly to reduce the computational complexity. It is shown that the approximations used in the proposed algorithm do not cause any serious performance degradation compared to the conventional trellis-based iterative equalization algorithms.","PeriodicalId":129008,"journal":{"name":"IEEE 54th Vehicular Technology Conference. VTC Fall 2001. Proceedings (Cat. No.01CH37211)","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134043905","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: 25
Blind ISI mitigation 盲ISI缓解
IEEE 54th Vehicular Technology Conference. VTC Fall 2001. Proceedings (Cat. No.01CH37211) Pub Date : 2001-10-07 DOI: 10.1109/VTC.2001.956532
Y. Mostofi, D. Cox
{"title":"Blind ISI mitigation","authors":"Y. Mostofi, D. Cox","doi":"10.1109/VTC.2001.956532","DOIUrl":"https://doi.org/10.1109/VTC.2001.956532","url":null,"abstract":"In an outdoor communication environment, a percentage of bandwidth is wasted sending a training sequence for channel estimation and equalization. For instance in GSM, 17.93% of bandwidth is dedicated to the transmission of such a known sequence. Therefore, if a blind algorithm, using only the knowledge of input constellation and/or correlation, can achieve an acceptable performance, it will save bandwidth considerably. If the receiver does not have this information, blind adaptation would not be feasible with reasonable complexity. We present a robust blind adaptation structure for TDMA-based communication systems. Also, we include implementation issues such as differential coding and oversampling in our system modeling.","PeriodicalId":129008,"journal":{"name":"IEEE 54th Vehicular Technology Conference. VTC Fall 2001. Proceedings (Cat. No.01CH37211)","volume":"81 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134394220","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
Diversity reception for blockage mitigation in EHF land mobile satellite communications systems 超高频陆地移动卫星通信系统中用于减缓阻塞的分集接收
IEEE 54th Vehicular Technology Conference. VTC Fall 2001. Proceedings (Cat. No.01CH37211) Pub Date : 2001-10-07 DOI: 10.1109/VTC.2001.956569
J. Schodorf, Peter Hsin-Yu Wu
{"title":"Diversity reception for blockage mitigation in EHF land mobile satellite communications systems","authors":"J. Schodorf, Peter Hsin-Yu Wu","doi":"10.1109/VTC.2001.956569","DOIUrl":"https://doi.org/10.1109/VTC.2001.956569","url":null,"abstract":"Due to severe signal shadowing caused by objects in the propagation path, EHF land mobile satellite communications systems are characterized by intermittent links. One approach to overcoming this so-called signal blockage problem is to employ diversity reception. Two approaches to diversity reception, one temporal and one spatial, are considered in this work. The performance of the schemes are characterized analytically in terms of outage probability reduction and resource efficiency gains. Moreover, the effects of correlation among the diversity channels are also quantified. Analysis results indicate that only a few uncorrelated diversity channels are required to achieve significant improvements. When the diversity channels are correlated, more channels are necessary to achieve similar gains.","PeriodicalId":129008,"journal":{"name":"IEEE 54th Vehicular Technology Conference. VTC Fall 2001. Proceedings (Cat. No.01CH37211)","volume":"117 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134403532","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: 5
Concatenation of space-time block codes and multilevel coding over Rayleigh fading channels 瑞利衰落信道上空时分组码的串接与多电平编码
IEEE 54th Vehicular Technology Conference. VTC Fall 2001. Proceedings (Cat. No.01CH37211) Pub Date : 2001-10-07 DOI: 10.1109/VTC.2001.956584
D. Yuan, Feng Zhang, A. So, Zuo-Wei Li
{"title":"Concatenation of space-time block codes and multilevel coding over Rayleigh fading channels","authors":"D. Yuan, Feng Zhang, A. So, Zuo-Wei Li","doi":"10.1109/VTC.2001.956584","DOIUrl":"https://doi.org/10.1109/VTC.2001.956584","url":null,"abstract":"Space-time block codes (STBC) are designed to achieve the maximum possible diversity benefit. However, STBC needs to be concatenated with an outer code which provides a significant coding gain. Based on the capacity rule and a multilevel codes/multi-stage decoding (MLC/MSD) system, this paper presents three concatenation schemes of STBC and MLC/MSD. Punctured convolutional codes are selected as component codes according to the capacity rule. The performances of different hard and soft concatenation schemes are analyzed and performance comparisons are made for three mapping strategies, named Ungerboeck partitioning (UP), block partitioning (BP) and mixed partitioning (MP). Then, we present the best concatenation scheme for a mobile environment.","PeriodicalId":129008,"journal":{"name":"IEEE 54th Vehicular Technology Conference. VTC Fall 2001. Proceedings (Cat. No.01CH37211)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134496027","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
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