VTC2000-Spring. 2000 IEEE 51st Vehicular Technology Conference Proceedings (Cat. No.00CH37026)最新文献_第7页

Natural wave propagation in subway tunnels at mobile communications frequencies 移动通信频率下地铁隧道内的自然波传播

VTC2000-Spring. 2000 IEEE 51st Vehicular Technology Conference Proceedings (Cat. No.00CH37026) Pub Date : 2000-05-15 DOI: 10.1109/VETECS.2000.851624

D. Didascalou, J. Maurer, W. Wiesbeck

引用次数: 6

Multi-user decision-feedback space-time processing with partial cross-feedback connectivity 具有部分交叉反馈连通性的多用户决策反馈时空处理

VTC2000-Spring. 2000 IEEE 51st Vehicular Technology Conference Proceedings (Cat. No.00CH37026) Pub Date : 2000-05-15 DOI: 10.1109/VETECS.2000.851657

S. Roy, D. Falconer

{"title":"Multi-user decision-feedback space-time processing with partial cross-feedback connectivity","authors":"S. Roy, D. Falconer","doi":"10.1109/VETECS.2000.851657","DOIUrl":"https://doi.org/10.1109/VETECS.2000.851657","url":null,"abstract":"This paper investigates space-time receiver architectures in multi-user wireless systems where optimal idealized (infinite-length) space-time filtering is applied to minimize the mean-square error. Both feedforward, decision-feedback and cross-decision feedback filters are employed; it follows that not only does the system eliminate the post-cursor ISI (intersymbol interference) but also some portion of the post-cursor CCI (co-channel interference). Such a receiver is most useful in the context of an SDMA (space division multiple access) system since the base station then has readily available knowledge on the decisions of the in-cell co-channel interfering signals. However, significant CCI is also received from outside the cell for which there is normally no decision information available. Therefore, in-cell and out-of-cell co-channel interferers will be treated differently by the receiver since no cross-feedback filter can be implemented for the out-of-cell signals. Our analysis leads to a closed-form expression for the minimum achievable MSE (mean-square error) for both fully- and partially-connected cross-decision feedback systems (XDF). Numerical results compare the performance of XDF systems with standard space-time DF and linear processing as well as the matched-filter bound.","PeriodicalId":318880,"journal":{"name":"VTC2000-Spring. 2000 IEEE 51st Vehicular Technology Conference Proceedings (Cat. No.00CH37026)","volume":"87 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122032496","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

TCP performance over cdma2000 RLP TCP性能优于cdma2000 RLP

VTC2000-Spring. 2000 IEEE 51st Vehicular Technology Conference Proceedings (Cat. No.00CH37026) Pub Date : 2000-05-15 DOI: 10.1109/VETECS.2000.851414

F. Khan, S. Kumar, K. Medepalli, S. Nanda

{"title":"TCP performance over cdma2000 RLP","authors":"F. Khan, S. Kumar, K. Medepalli, S. Nanda","doi":"10.1109/VETECS.2000.851414","DOIUrl":"https://doi.org/10.1109/VETECS.2000.851414","url":null,"abstract":"This paper provides performance results for TCP over cdma2000 radio link protocol (RLP). The simulations are performed for a single user running a long FTP application with \"infinite\" data backlog. With the assumption of a long FTP application, maximum TCP throughput is the relevant optimization metric. The goal is to analyze the impact of TCP window size, RTT, wireless channel bandwidth, FER model and RLP transmission delays on end-to-end transport. The IS-95 and its evolutions (i.e. IS-95B and cdma2000) use a NAK-based RLP. The number of rounds of NAKs and the number of retransmissions in each round is varied. We analyze the impact of varying different RLP parameters and retransmission schemes on TCP throughput. Our findings demonstrate that the (1,1,1,1,1) NAK scheme outperforms the (2,3) NAK scheme when the errors are correlated. This is also true for non-correlated error case and larger TCP window size. However, with non-correlated errors and comparatively smaller TCP window size, the (2,3) NAK scheme performs better. It was also observed that the TCP throughput is not severely penalized up to link error rates of 10% (approximately 15% loss in TCP throughput at 10% FER).","PeriodicalId":318880,"journal":{"name":"VTC2000-Spring. 2000 IEEE 51st Vehicular Technology Conference Proceedings (Cat. No.00CH37026)","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116811882","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: 53

Vehicular pulse-radar with very low false alarm rate by on-off pulse control and adaptive threshold 通过脉冲开关控制和自适应阈值，实现了低虚警率的车载脉冲雷达

VTC2000-Spring. 2000 IEEE 51st Vehicular Technology Conference Proceedings (Cat. No.00CH37026) Pub Date : 2000-05-15 DOI: 10.1109/VETECS.2000.851396

Y. C. Kim, B. Choi

引用次数: 0

The impact of the radio network planning and site configuration on the WCDMA network capacity and quality of service 无线网络规划和站点配置对WCDMA网络容量和服务质量的影响

VTC2000-Spring. 2000 IEEE 51st Vehicular Technology Conference Proceedings (Cat. No.00CH37026) Pub Date : 2000-05-15 DOI: 10.1109/VETECS.2000.851276

J. Laiho-Steffens, A. Wacker, P. Aikio

引用次数: 37

Microcell prediction by street and terrain data 通过街道和地形数据进行微单元预测

VTC2000-Spring. 2000 IEEE 51st Vehicular Technology Conference Proceedings (Cat. No.00CH37026) Pub Date : 2000-05-15 DOI: 10.1109/VETECS.2000.851656

W.C.-Y. Lee, D.J.Y. Lee

引用次数: 2

Analytical model for radio link protocol for IS-95 CDMA systems IS-95 CDMA系统无线链路协议分析模型

VTC2000-Spring. 2000 IEEE 51st Vehicular Technology Conference Proceedings (Cat. No.00CH37026) Pub Date : 2000-05-15 DOI: 10.1109/VETECS.2000.851709

John M. Harris, Manish Airy

引用次数: 23

Performance analysis of DS-CDMA reverse link with fiber-optic repeaters 带光纤中继器的DS-CDMA反向链路性能分析

VTC2000-Spring. 2000 IEEE 51st Vehicular Technology Conference Proceedings (Cat. No.00CH37026) Pub Date : 2000-05-15 DOI: 10.1109/VETECS.2000.851710

K. Jeong, J. Cheong, T. Park, T.G. Kim, S. Park

引用次数: 5

Iterative decoding of redundant residue number system codes 冗余剩余数系统码的迭代译码

VTC2000-Spring. 2000 IEEE 51st Vehicular Technology Conference Proceedings (Cat. No.00CH37026) Pub Date : 2000-05-15 DOI: 10.1109/VETECS.2000.851523

T. Liew, L. Yang, L. Hanzo

引用次数: 6

Turbo coding performance in OFDM packet transmission OFDM包传输中的Turbo编码性能

VTC2000-Spring. 2000 IEEE 51st Vehicular Technology Conference Proceedings (Cat. No.00CH37026) Pub Date : 2000-05-15 DOI: 10.1109/VETECS.2000.851236

R. Hoshyar, S. H. Jamali, A. Bahai

{"title":"Turbo coding performance in OFDM packet transmission","authors":"R. Hoshyar, S. H. Jamali, A. Bahai","doi":"10.1109/VETECS.2000.851236","DOIUrl":"https://doi.org/10.1109/VETECS.2000.851236","url":null,"abstract":"In transmission of the packets using OFDM (orthogonal frequency division multiplexing) system recommended by IEEE.802.11 there is a constraint on the interleaving depth due to the maximum allowable packet size and processing delay requirement. This results in a non-ideal interleaving which effectively limits the maximum achievable diversity from the channel. In such a channel, fading occurs in block wise manner, i.e., all transmitted symbols of the same block sense the same fade. Also, there is considerable correlation among the fade blocks. We call such a channel as correlated block fading (CBF) channel. With the excellent performance of turbo codes over AWGN, and ideally interleaved fading channels in mind, we tried to get similarly good performance by using turbo codes in OFDM packet transmission. We observed that the system severely suffers from the block fading behavior of the channel. A performance analysis is presented for CBF systems, and simulations for the OFDM system using rate 1/2 convolutional codes and turbo codes are performed. While the turbo code has no gain over the convolutional code with K=7 in BER (bit error rate) performance, it brings about 1.3 dB gain in PER (packet error rate) performance which is more important in packet transmission.","PeriodicalId":318880,"journal":{"name":"VTC2000-Spring. 2000 IEEE 51st Vehicular Technology Conference Proceedings (Cat. No.00CH37026)","volume":"140 2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130909178","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: 18