VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151)最新文献_第6页

Performance enhancement through joint detection of cochannel signals using diversity arrays 通过使用分集阵列联合检测共信道信号来增强性能

VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151) Pub Date : 1998-05-18 DOI: 10.1109/VETEC.1998.686398

S. Grant, J. Cavers

{"title":"Performance enhancement through joint detection of cochannel signals using diversity arrays","authors":"S. Grant, J. Cavers","doi":"10.1109/VETEC.1998.686398","DOIUrl":"https://doi.org/10.1109/VETEC.1998.686398","url":null,"abstract":"Joint detection based on exploiting differences among the channels employed by several users allows a receiver to distinguish cochannel signals without reliance on spectrum spreading. This paper makes a number of new contributions to the topic: it provides an analytical expression for the union bound on average symbol error rate for an arbitrary number of users and diversity antennas in a fading environment, for both perfect and imperfect CSI, and it compares the performance of joint detection with diversity antennas against classical MMSE combining. The performance is remarkable. With accurate CSI, several users can experience good performance with only a single antenna; moreover, for perfect CSI, only a 2 dB penalty is incurred for each additional user. With several antennas, many more users than the number of antennas may be supported with a slow degradation in performance for each additional user. Furthermore, high accuracy is not required from the channel estimation process. In all cases, the performance of joint detection exceeds that of MMSE combining by orders of magnitude.","PeriodicalId":335954,"journal":{"name":"VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132420959","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: 167

Low power VLSI DS/FH hybrid CDMA spread spectrum IF/baseband transceiver design 低功耗VLSI DS/FH混合CDMA扩频中频/基带收发器设计

VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151) Pub Date : 1998-05-18 DOI: 10.1109/VETEC.1998.686553

S. Hong, W. Stark

{"title":"Low power VLSI DS/FH hybrid CDMA spread spectrum IF/baseband transceiver design","authors":"S. Hong, W. Stark","doi":"10.1109/VETEC.1998.686553","DOIUrl":"https://doi.org/10.1109/VETEC.1998.686553","url":null,"abstract":"A low power digital VLSI baseband transceiver design methodology based on the formulation of empirical power consumption and a system performance model is presented. The method is applied in designing a low-power single chip VLSI solution which implements an architecture for an all-digital binary phase shift keyed (BPSK) direct-sequence (DS) spread spectrum combined with frequency-hopping (FH) technique. The architecture incorporates a low complexity digital Costas loop for carrier recovery and a delay-locked loop for clock recovery. For the pseudo-random noise (PN) sequence acquisition, an energy detection scheme is incorporated. The discussed architecture is intended for use in very high spread spectrum radio band and with various data type processing capability such as image, video, audio, as well as text data. The proposed method formulates the relationships between the circuitry processing power consumed by the transceiver chip architecture and the performance of the transceiver system over the wide range of data rates, processing gains, and signal-to-noise ratios (SNR). The model provides the insights into the system design trade-offs to be made during the low-power transceiver system design process. Individual key digital processing component comprising the system is implemented in 0.6 microns CMOS technology from which the power consumption information is extracted. System performance sensitive functional DSP modules are identified and analyzed including the finite word-length effects on the overall transceiver performance.","PeriodicalId":335954,"journal":{"name":"VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151)","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132483674","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

Efficient algorithms for prediction of indoor radio propagation 室内无线电传播预测的有效算法

VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151) Pub Date : 1998-05-18 DOI: 10.1109/VETEC.1998.686639

S. Fortune

引用次数: 33

A diversity co-channel interference canceller for AMPS cellular systems 一种用于AMPS蜂窝系统的分集同信道干扰消除器

VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151) Pub Date : 1998-05-18 DOI: 10.1109/VETEC.1998.686466

A. Carter, D. Hilborn, N. Secord, A. Abu-Dayya

引用次数: 2

Measurements of base station two-branch space and polarization diversity reception and a comparison of the diversity gain based on the CDF of signal level and simulations of BER in a GSM system GSM系统中基于信号电平CDF的基站双支路空间和极化分集接收测量及分集增益比较与误码率仿真

VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151) Pub Date : 1998-05-18 DOI: 10.1109/VETEC.1998.686462

D. Emmer, E. Humburg, P. Weber, M. Weckerle

{"title":"Measurements of base station two-branch space and polarization diversity reception and a comparison of the diversity gain based on the CDF of signal level and simulations of BER in a GSM system","authors":"D. Emmer, E. Humburg, P. Weber, M. Weckerle","doi":"10.1109/VETEC.1998.686462","DOIUrl":"https://doi.org/10.1109/VETEC.1998.686462","url":null,"abstract":"This paper summarizes the results of a measurement campaign to evaluate the performance of different diversity schemes. The measurements have been carried out using the Siemens proprietary wideband channel sounder, the SIMOCS-2000. The key objective of the measurement campaign has been to evaluate the performance of polarization diversity as compared to space diversity. In addition, we contrasted the results for diversity gain based on signal statistics with results from link level simulations. The measurements have been carried out at 1815 MHz and GSM has been assumed for the standard dependent evaluations by means of link level simulations. Evaluating the measurements based on the well known and widely used CDF method according to Turkmani, Arowojolu, Jefford and Kellett (see IEEE Trans. Vehic. Technol., vol.44, no.2, p.318-26, 1995), space diversity provides a maximum value of 6 dB diversity gain for a horizontal separation of 10 /spl lambda/ between two vertically polarized antennas. Using a /spl plusmn/45/spl deg/ dual polarized antenna polarization diversity results in a diversity gain of 5.5 dB and performs as well as space diversity. The use of a horizontal/vertical polarized antenna provides a diversity gain of 3-4 dB. Comparing the figures for the diversity gain computed according to Turkmani et al. with those obtained by GSM link level simulations we show that the CDF method results in diversity gain figures which are 2-3 dB too optimistic. However, a modification of the method according to Turkmani et al. which takes into account the effects of an interleaver in the transmission chain of the real communication system results in an almost perfect match.","PeriodicalId":335954,"journal":{"name":"VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151)","volume":"375 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131657098","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: 8

Call admission control in mobile cellular network based on macroscopic modeling of vehicular traffic 基于车辆交通宏观建模的移动蜂窝网络呼叫接纳控制

VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151) Pub Date : 1998-05-18 DOI: 10.1109/VETEC.1998.686094

Taekyoung Kwon, Yanghee Choi

引用次数: 10

Experimental characterization of DOA at the base station in rural and urban area 城乡基站DOA的实验表征

VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151) Pub Date : 1998-05-18 DOI: 10.1109/VETEC.1998.686389

Patrice Pajusco

引用次数: 60

A three-dimensional wideband propagation model for the study of base station antenna arrays with application to LMCS 用于基站天线阵列研究的三维宽带传播模型及其在LMCS中的应用

VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151) Pub Date : 1998-05-18 DOI: 10.1109/VETEC.1998.686067

S. Roy, D. Falconer

{"title":"A three-dimensional wideband propagation model for the study of base station antenna arrays with application to LMCS","authors":"S. Roy, D. Falconer","doi":"10.1109/VETEC.1998.686067","DOIUrl":"https://doi.org/10.1109/VETEC.1998.686067","url":null,"abstract":"A model is proposed herein to simulate wideband correlated diversity channel from the point of view of the base station. It is assumed that scattering activity is limited to a local area around the subscriber and possibly additional secondary scattering areas, each being of local extent. Simulation is possible by generating correlated random variates obeying a complex Gaussian law to represent an instance of the impulse response at each antenna element. A mathematical definition of the correlation existing between discrete channel coefficients is provided as a function of separation in space (lag) and separation in frequency. Thus, the channel correlation between antenna elements is characterized by a lag-frequency correlation function in a three-dimensional (cylinder of scatterers) propagation scenario. The mathematical formulation incorporates the effect of arbitrary antenna patterns at the base and at the subscriber station. Simulation proceeds by dividing the band of interest into a number of frequency bins (each smaller than the coherence bandwidth) leading to the construction of a discrete lag-frequency matrix of channel coefficients. Since the model is not concerned with temporal channel variations, it is appropriate for Monte-Carlo simulations for calculations such as outage probability, system capacity, etc.","PeriodicalId":335954,"journal":{"name":"VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125313765","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 broadband linear power amplifier for software radio applications 一种用于软件无线电应用的宽带线性功率放大器

VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151) Pub Date : 1998-05-18 DOI: 10.1109/VETEC.1998.686138

Kevin Morris, P. Kenington

引用次数: 9

Architecture of the dedicated short-range communications (DSRC) protocol 专用短程通信(DSRC)协议的体系结构

VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151) Pub Date : 1998-05-18 DOI: 10.1109/VETEC.1998.686127

C. Cseh

引用次数: 102