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

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Improving QPSK demodulator performance for quadrature receiver with information from amplitude and phase imbalance correction 利用幅相不平衡校正信息改善正交接收机QPSK解调性能
2000 IEEE Wireless Communications and Networking Conference. Conference Record (Cat. No.00TH8540) Pub Date : 2000-09-23 DOI: 10.1109/WCNC.2000.904844
Hung H. Nguyen
{"title":"Improving QPSK demodulator performance for quadrature receiver with information from amplitude and phase imbalance correction","authors":"Hung H. Nguyen","doi":"10.1109/WCNC.2000.904844","DOIUrl":"https://doi.org/10.1109/WCNC.2000.904844","url":null,"abstract":"In communication receivers, the gain and phase inbalance between the inphase and quadrature (I&Q) channels can cause serious degradation in receiver performance. Consider the problem of jointly estimating the four parameters of the received I&Q signals: the amplitude imbalance, the DC offset for each channel, and the phase onsets between the I&Q channels. Using a Fourier series expansion of the received data, the equations for least square estimation based on the measured I&Q data in a loop back mode are derived. The estimated parameters are then used for the correction of the data and the improvement of the BER performance. Examples are given for the compensation of amplitude and phase imbalance in a QPSK receiver and higher order modulation.","PeriodicalId":404304,"journal":{"name":"2000 IEEE Wireless Communications and Networking Conference. Conference Record (Cat. No.00TH8540)","volume":"200 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":"126067820","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
An ad hoc wireless testbed for scalable, adaptive QoS support 一个用于可扩展、自适应QoS支持的临时无线测试平台
2000 IEEE Wireless Communications and Networking Conference. Conference Record (Cat. No.00TH8540) Pub Date : 2000-09-23 DOI: 10.1109/WCNC.2000.904763
R. Ramanathan, R. Hain
{"title":"An ad hoc wireless testbed for scalable, adaptive QoS support","authors":"R. Ramanathan, R. Hain","doi":"10.1109/WCNC.2000.904763","DOIUrl":"https://doi.org/10.1109/WCNC.2000.904763","url":null,"abstract":"We describe the construction of, and our experimental experience with, an ad hoc wireless testbed developed as part of the DARPA Global Mobile Information Systems (GloMo) sponsored MMWN and DAWN projects. The goal of the MMWN/DAWN system is the network-layer support for real-time QoS in large, dense, mobile ad hoc networks. The testbed consists of MMWN/DAWN switches-a single box with an embedded processor, and a commercial radio transceiver, and endpoints-laptops running voice and data applications. We have conducted a number of real-life experiments with this testbed, and report on our experiences and results.","PeriodicalId":404304,"journal":{"name":"2000 IEEE Wireless Communications and Networking Conference. Conference Record (Cat. No.00TH8540)","volume":"64 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":"127905001","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
Forward-link CDMA resource allocation based on pricing 基于定价的前向链路CDMA资源分配
2000 IEEE Wireless Communications and Networking Conference. Conference Record (Cat. No.00TH8540) Pub Date : 2000-09-23 DOI: 10.1109/WCNC.2000.904838
Peijuan Liu, M. Honig, S. Jordan
{"title":"Forward-link CDMA resource allocation based on pricing","authors":"Peijuan Liu, M. Honig, S. Jordan","doi":"10.1109/WCNC.2000.904838","DOIUrl":"https://doi.org/10.1109/WCNC.2000.904838","url":null,"abstract":"This paper studies pricing as a means for resource allocation in a wireless direct-sequence (DS) code division multiple access (CDMA) system. We consider the forward link of a single cell with orthogonal codes and voice traffic. The base station announces a price per unit transmitted power and a price per code, and the users respond according to their individual utilities. The objective is to set prices to maximize either total user utility or total revenue. The solution to the former problem (maximize utility) is presented. To study the latter problem we derive the large system revenue as the number of users and codes tend to infinity with fixed ratio. The large system revenue depends on the distribution of utilities and path loss across the user population, and may not be a unimodal function of the prices. Numerical results based on a simple model for user utility show how the optimal prices and revenue vary with the offered load.","PeriodicalId":404304,"journal":{"name":"2000 IEEE Wireless Communications and Networking Conference. Conference Record (Cat. No.00TH8540)","volume":"38 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":"129169879","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: 48
Receive diversity for mobile OFDM systems 接收分集的移动OFDM系统
2000 IEEE Wireless Communications and Networking Conference. Conference Record (Cat. No.00TH8540) Pub Date : 2000-09-23 DOI: 10.1109/WCNC.2000.903941
A. Hutter, J. Hammerschmidt, E. Carvalho, J. Cioffi
{"title":"Receive diversity for mobile OFDM systems","authors":"A. Hutter, J. Hammerschmidt, E. Carvalho, J. Cioffi","doi":"10.1109/WCNC.2000.903941","DOIUrl":"https://doi.org/10.1109/WCNC.2000.903941","url":null,"abstract":"We investigate receive diversity for OFDM-based broadband communication systems. We consider the use of multiple antennas to combat time-selective fading and OFDM transmission in combination with an appropriate guard interval to suppress intersymbol interference. The receive diversity scheme is located in the frequency-domain and we derive different linear estimators, hereafter referred to as diversity equalizers. We show that the carrier-based solution for the optimum linear MMSE estimator-which is the least complex solution that maximizes the overall SNR is the well known maximum ratio combiner (MRC). Furthermore, we present a performance analysis for the proposed diversity equalizers and compare theoretical results to a simulated system which uses channel state information for MRC.","PeriodicalId":404304,"journal":{"name":"2000 IEEE Wireless Communications and Networking Conference. Conference Record (Cat. No.00TH8540)","volume":"83 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":"129207329","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: 40
High capacity fixed wireless access systems with antenna arrays 带天线阵列的大容量固定无线接入系统
2000 IEEE Wireless Communications and Networking Conference. Conference Record (Cat. No.00TH8540) Pub Date : 2000-09-23 DOI: 10.1109/WCNC.2000.904668
T. Lok, T. Wong
{"title":"High capacity fixed wireless access systems with antenna arrays","authors":"T. Lok, T. Wong","doi":"10.1109/WCNC.2000.904668","DOIUrl":"https://doi.org/10.1109/WCNC.2000.904668","url":null,"abstract":"In this paper, we consider fixed wireless access (FWA) systems with antenna arrays. We consider both the downlink and the uplink. Multiple antennas are used at the transmitters, as well as the receivers. We demonstrate that with antenna arrays, the user capacity of a system can be dramatically increased, allowing multiple users to use the same narrowband spectrum simultaneously. In general, it may be difficult to determine the optimal transmission vectors. We consider a simple algorithm that often yields desirable solutions. We also consider the special case of co-located users. The communication system then reduces to a point-to-point communication link where the optimal transmission vectors can be determined under some conditions.","PeriodicalId":404304,"journal":{"name":"2000 IEEE Wireless Communications and Networking Conference. Conference Record (Cat. No.00TH8540)","volume":"41 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":"132390195","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
System design for DS/SSMA communications with random spreading sequences and a matched filter receiver 基于随机扩频序列和匹配滤波接收机的DS/SSMA通信系统设计
2000 IEEE Wireless Communications and Networking Conference. Conference Record (Cat. No.00TH8540) Pub Date : 2000-09-23 DOI: 10.1109/WCNC.2000.903931
Joon Ho Cho, J. Lehnert
{"title":"System design for DS/SSMA communications with random spreading sequences and a matched filter receiver","authors":"Joon Ho Cho, J. Lehnert","doi":"10.1109/WCNC.2000.903931","DOIUrl":"https://doi.org/10.1109/WCNC.2000.903931","url":null,"abstract":"The problem of selecting the processing gain and the chip waveform of a band-limited, direct-sequence spread-spectrum multiple-access communication system with aperiodic random spreading sequences and conventional matched filter receiver is considered when given the system bandwidth and the symbol transmission rate. The average probability of bit error is used as the objective function of the optimization. The signals are constrained to be strictly band-limited and to produce zero interchip interference. With a technique to characterize a band-limited chip waveform with a finite number of parameters, a sufficient condition for a system to have lower average probability of bit error is found. Some design strategies are derived that are based on the sufficient condition. Design examples are also provided using analytical methods and Monte-Carlo simulations.","PeriodicalId":404304,"journal":{"name":"2000 IEEE Wireless Communications and Networking Conference. Conference Record (Cat. No.00TH8540)","volume":"10 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":"131678871","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
Blind source extraction in a multiuser context 多用户环境下的盲源提取
2000 IEEE Wireless Communications and Networking Conference. Conference Record (Cat. No.00TH8540) Pub Date : 2000-09-23 DOI: 10.1109/WCNC.2000.904796
A. D. Baynast, I. Fijalkow
{"title":"Blind source extraction in a multiuser context","authors":"A. D. Baynast, I. Fijalkow","doi":"10.1109/WCNC.2000.904796","DOIUrl":"https://doi.org/10.1109/WCNC.2000.904796","url":null,"abstract":"In this paper, we consider the problem of blind detection of DS-CDMA signals in a multipath, asynchronous context (up-link transmission). We show that blind source extraction techniques provide a general framework but must be constrained to ensure the detection of the source signal corresponding to a given spreading sequence. First, we provide an original analysis of the constrained methods derived from the work of Tsatsanis (1997), unifying all these approaches and showing their limitations in multipath propagation. Second, we also propose a complete multiuser detection system based on the constant modulus algorithm, in the case of large channel dispersion (more than one symbol period).","PeriodicalId":404304,"journal":{"name":"2000 IEEE Wireless Communications and Networking Conference. Conference Record (Cat. No.00TH8540)","volume":"13 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":"133503407","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
Markov modulated Poisson process model for hand-off calls in cellular systems 蜂窝系统中切换呼叫的马尔可夫调制泊松过程模型
2000 IEEE Wireless Communications and Networking Conference. Conference Record (Cat. No.00TH8540) Pub Date : 2000-09-23 DOI: 10.1109/WCNC.2000.904784
M. A. Farahani, M. Guizani
{"title":"Markov modulated Poisson process model for hand-off calls in cellular systems","authors":"M. A. Farahani, M. Guizani","doi":"10.1109/WCNC.2000.904784","DOIUrl":"https://doi.org/10.1109/WCNC.2000.904784","url":null,"abstract":"The growth of telecommunication systems is more than ever stimulating the need for mathematical modeling and evaluation techniques to predict the performance of these systems. These techniques have become an indispensable tool for assessment of the performance of a system, evaluation of design alternatives, resource dimensioning, and system configuration. The Poisson distribution is a good representative for most telecommunication events. The hand-off calls in a cellular system have bursty characteristics which means they are happening with different rates. Therefore, there is a need for a model that is able to capture this specific behavior. In this paper, Markov modulated Poisson process (MMPP) is used to model the hand-off calls. Then, an analytical model of a cellular system is solved and the performance metrics are calculated. Finally, we compared our results with those obtained when considering only the Poisson model.","PeriodicalId":404304,"journal":{"name":"2000 IEEE Wireless Communications and Networking Conference. Conference Record (Cat. No.00TH8540)","volume":"62 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":"133928721","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: 22
Soft decoding techniques for broadband wireless channels 宽带无线信道软解码技术
2000 IEEE Wireless Communications and Networking Conference. Conference Record (Cat. No.00TH8540) Pub Date : 2000-09-23 DOI: 10.1109/WCNC.2000.904874
M. Ran, J. Liebetreu, Mohammad Akhter
{"title":"Soft decoding techniques for broadband wireless channels","authors":"M. Ran, J. Liebetreu, Mohammad Akhter","doi":"10.1109/WCNC.2000.904874","DOIUrl":"https://doi.org/10.1109/WCNC.2000.904874","url":null,"abstract":"This document addresses several aspects of block turbo codes (BTC) and higher order modulations, selected as the optional coding scheme for the burst modes of the IEEE 802.16.1, air interface draft standard. Compatibility, with mandatory burst modes (MODE B downstream and upstream transmissions), includes the same processes for the transmission convergence (TC) layer and physical media dependent (PMD) layer. However, the PMD sublayer is enhanced to allow for the replacement the FEC schemes based on RS variants with BTC.","PeriodicalId":404304,"journal":{"name":"2000 IEEE Wireless Communications and Networking Conference. Conference Record (Cat. No.00TH8540)","volume":"11 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":"122762509","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
Asymptotically optimal CDMA receiver: perfect MAI cancellation 渐近最优CDMA接收机:完美的MAI取消
2000 IEEE Wireless Communications and Networking Conference. Conference Record (Cat. No.00TH8540) Pub Date : 2000-09-23 DOI: 10.1109/WCNC.2000.904856
Zhengyuan Xu
{"title":"Asymptotically optimal CDMA receiver: perfect MAI cancellation","authors":"Zhengyuan Xu","doi":"10.1109/WCNC.2000.904856","DOIUrl":"https://doi.org/10.1109/WCNC.2000.904856","url":null,"abstract":"Multiple access interference (MAI) as well as multipath distortions are two major obstacles in multiuser communication. The MAI in the received data vectors can be eliminated by projecting the received data onto the subspace orthogonal to the code space of interfering users. After this operation, an equivalent single user model with AWGN is obtained. Therefore various detection techniques, e.g., maximum SNR, subspace, constrained optimization, iterative least squares with projection (ILSP), etc. can be successfully applied to estimate transmitted symbols and the multipath channel of the desired user, but with reduced complexity and asymptotically optimal performance. The proposed receiver is simulated by ILSP and constrained optimization method and its performance compared with the RAKE receiver and the decorrelating receiver. Much lower bit error probability is achieved for a wide range of SNRs.","PeriodicalId":404304,"journal":{"name":"2000 IEEE Wireless Communications and Networking Conference. Conference Record (Cat. No.00TH8540)","volume":"14 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":"127821192","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
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