3 edition of Adaptive antenna array techniques for the reverse link of DS-CDMA systems. found in the catalog.
Adaptive antenna array techniques for the reverse link of DS-CDMA systems.
Ioannis M. Kountouris
Thesis (M.A.Sc.) -- University of Toronto, 2002.
|Series||Canadian theses = -- Th`eses canadiennes|
|The Physical Object|
|Pagination||2 microfiches : negative.|
To contribute to my confusion, there is a book Adaptive Antennas and Phased Arrays for Radar and Communications by Alan J. Fenn, which has two major parts: one on adaptive antennas and one on phased arrays. These parts address different problems: smart antennas for nulling out interference sources and phased arrays to scan an antenna field of view. Beamforming or spatial filtering is a signal processing technique used in sensor arrays for directional signal transmission or reception. This is achieved by combining elements in an antenna array in such a way that signals at particular angles experience constructive interference while others experience destructive interference. Beamforming can be used at both the transmitting and receiving. CDMA Techniques for Third Generation Mobile Systems is an invaluable reference work for engineers and researchers involved in the development of specific CDMA systems.\/span>\"@ en\/a> ; \u00A0\u00A0\u00A0\n schema:description\/a> \" 1 Spreading Techniques, a Far-reaching Technology -- Introduction -- Benefits of Spreading --
Adaptive antenna systems Abstract: A system consisting of an antenna array and an adaptive processor can perform filtering in both the space and the frequency domains, thus reducing the sensitivity of the signal-receiving system to interfering directional noise sources.
Variable weights of a signal processor can be automatically adjusted by a. Abstract. In this paper adaptive algorithms that may be used for spatial filtering or spatio-temporal filtering in a direct sequence code division multiple access (DS-CDMA) communication system are compared on the basis of signal-io-interference-and-noise-raiio (SINE,) improvements, algorithm convergence rates, capacity enhancement, and computational by: 1.
´Adaptive Antenna Arrays: Trends and Applications’ is a compilation of the works and insights of various key scientists and engineers who are involved in this area. Its contents address the current and future trends of scenarios for employing adaptive antenna arrays in communication systems.
Adaptive Beam forming Algorithms for Anti-Jamming technique, March Simple and robust convergence is. 3 Adaptive Antennas The term adaptive antenna is used for a phased array, when the weighting on each element is applied in a dynamic fashion. The amount of weighting on each channel is not fixed at the time of the array design, but.
The conventional algorithms use knowledge of a desired reference signal and measurements of the received signal to adapt the antenna weights. In contrast, the channel estimation algorithms use properties of the underlying code structure of DS-CDMA systems to estimate the array.
Adaptive Antenna Array Processing for GPS Receivers By Yaohua Zheng Thesis submitted for the degree of Master of Engineering Science School of Electrical & Electronic Engineering Faculty of Engineering, Computer & Mathematical Sciences The University.
Subband Adaptive Array for Multirate Multicode DS-CDMA Systems. An adaptive antenna array or a smart antenna is named a software antenna because it can form a desired antenna pattern and. Abstract: DS/CDMA cellular systems are plagued with the near-far problem which can result in considerable reduction in capacity.
Adaptive antenna arrays are used to increase link capacity, improve coverage and permit less stringent power control. Adaptive beamforming algorithms are crucial to the success of the smart antennas. techniques to improve spectrum utilization. The CDMA and adaptive antenna array are two approaches that shows real promise for increasing spectrum efficiency.
This paper focuses on the application of adaptive arrays to the Code Division Multiple Access (CDMA) cellular systems. The adaptive antenna has an intelligent control unit, so. Ishii and R. Kohno, “Joint Optimization of Spatial and Temporal Multiuser Equalization in Both Transmitter and Receiver Using an Adaptive Array Antennas for DS/CDMA,” IEEE GLOBECOM’96, Commun.
Theory Mini-Conference, pp. –, Nov. The introduction of the data-channel-associated pilot channel allows W-CDMA to support interference cancellation and adaptive antenna array techniques that can significantly increase the link. Smart Antennas Tutorial An overview, summary, or tutorial about the basics of smart antennas or the adaptive antenna array and smart antenna technology used with SDR, cognitive radio, MIMO, and other new technologies.
This book presents an alternative and simplified approaches for the robust adaptive detection and beamforming in wireless communications. It adopts several systems models including DS/CDMA, OFDM/MIMO with antenna array, and general antenna arrays beamforming model.
Dosaranian-Moghadam M, Bakhshi H and Dadashzadeh G () Reverse Link Performance of DS-CDMA Cellular Systems through Closed-Loop Power Control, Base Station Assignment, and Antenna Arrays in 2D Urban Environment, Wireless Personal Communications: An International Journal,(), Online publication date: 1-Jul The complex symbols a(n) = a r (n) + a im (n) are processed by the DS-CDMA transmission technique and transmitted at the chip domain as z(p), in a channel represented by h(p), subject to multipath and additive Gaussian noise r(p) (Additive White Gaussian Noise – AWGN), as illustrated in Fig.
le n represents discrete-time symbol and p represents discrete-time chip. Adaptive antenna arrays have been proposed as a technique to suppress interference and increase system capacity.
In specialized literature is found extensive studies for the cases of arrays with isotropic elements in adaptive antenna systems. In this paper, we apply dipoles as sensor elements and linear, circular and planar configurations in adaptive antenna arrays of DS-CDMA systems at the.
These antenna arrays employ an adaptive weighting algorithm, that adapts the weights based on the received signals to improve the performance of the array. In this section, the LMS algorithm is introduced.
LMS stands for Least-Mean-Square. This algortihm was developed by Bernard Widrow in the s, and is the first widely used adaptive algorithm. A novel adaptive antenna array for DS/CDMA code acquisition. orientated adaptive antenna array in the forward channel (base-station to mobile) of a multi-cell DS-CDMA system and established four performance boundaries.
Using the more conservative optimized array antenna performance boundary for the. With Adaptive Antennas PHS kHz 32 64 (32*8/4) effective reuse = 4, DDI Pocket GSM kHz (*8/2) effective reuse = 2, AC/OEM Trials IntelliWave FWA kHz (*2*) effective reuse = 1/, Various Operators.
Adaptive antenna gains are significant. Adaptive antenna benefits vary with air interface and. Adaptive Array Antenna for W-CDMA Systems vYutaka Yasui vShuji Kobayakawa vTadashi Nakamura (Manuscript received J ) The adaptive array antenna (AAA) is one of the advanced techniques that will be im-plemented in the IMT mobile telecommunications systems to achieve a high sys-tem capacity.
link performance using the 2 GHz carrier frequency band reserved for IMT systems was conducted in Tokyo. Mb/s data transmission was also examined. The field experi- ment results are presented.
The introduction of interference cancellation and adaptive antenna array techniques can reduce multi-access interference (MAI), and thus increase. system using a P-element linear antenna array is depicted in Fig. The user data are transmitted using MPSK modulation and spread using direct sequence CDMA (DS-CDMA) technique.
Each user in the CDMA system is assigned a unique pseudorandom code sequence. The signals are received by the antenna array, despread and. CDMA, cellular, adaptive antennas, shadowing, power control, capacity 1.
Introduction It was shown that CDMA (Code Division Multiple Access) systems based on spread spectrum techniques are effective in mitigating of two main limitations of mobile cellular communication systems, namely multipath fading and co-channel interference.
Figure 1. The principle of an adaptive array-based smart antennas. The antenna directs its main beam towards the desired mobile and nulls towards interfering mobiles. There are many algorithms used to update the array weights, each with its speed of convergence and required processing time [3, New adaptive ("smart") antenna arrays can enhance the performance of virtually any CDMA system, including IS, IMT and Wideband CDMA.
Smart Antennas for Wireless Communications is the first book that brings together all the real-world data and expertise communications engineers need to develop smart antennas for CDMA. The Storming Media report number is A The abstract provided by the Pentagon follows: This thesis examines a circular adaptive antenna array used at the mobile station for a typical Direct Sequence Code Division Multiple Access (DS- CDMA) cellular mobile communications : Stewart S.
Its contents address the current and future trends of scenarios for employing adaptive antenna arrays in communication systems. The complete spectrum of concepts and operations of adaptive antenna arrays are discussed. This book can serve as a quick reference for engineers, researchers, final year undergraduate and postgraduate students.
IS and Third Generation CDMA Applications. The one-stop source for engineering CDMA adaptive antennas. New adaptive ("smart") antenna arrays can enhance the performance of virtually any CDMA system, including IS, IMT and Wideband CDMA.
Smart Antennas for Wireless Communications is the first book that brings together all the real-world data and expertise communications engineers.
SYSTEMS Smart or adaptive antenna arrays can improve the performance of wireless communication systems. In this chapter, basic terms such as coverage and capacity are adaptive array antennas.
An array consists of two or more antennas (the elements of the techniques for increasing capacity using adaptive or smart antennas, but Section 4.
This paper proposes a system utilizing MC DS/CDMA and a recursive adaptive array antenna processing algorithm for estimating the array response vector (array manifold) and hence the optimal weights. In order to evaluate this system performance results. Adaptive Antenna Arrays for OFDM Systems With Cochannel Interference Ye (Geoffrey) Li, Senior Member, IEEE, and Nelson R.
Sollenberger, Fellow, IEEE Abstract—Orthogonal frequency-division multiplexing (OFDM) is one of the promising techniques for future mobile wireless data systems. For OFDM systems with cochannel interference.
Multiple Access (CDMA) cellular radio systems employing adaptive antennas in multipath environments. The results of simulations are described which illustrate the capacity improvements that can be achieved on the reverse link of a biphase asynchronous CDMA system using adaptive antenna arrays and switched beam systems at the base sta tion.
Switched-beam techniques are attractive for base station transmission, and two- and four-branch adaptive antenna array techniques are attractive for base station reception.
Since EDGE uses a relatively narrowband channel of kHz, it is subject to narrowband Rayleigh fading with some limited frequency diversity possible through sequence. Fourthly, asymptotic analysis on different types of diversity combiners in generalized fading channels is presented in a unifying way.
Finally, we investigate and present the impact of transmit diversity at handsets on the reverse link DS/CDMA systems in terms of capacity and coverage over generalized fading channels through analytical approaches.
within a cell can be signiﬁcantly reduced for both reverse link (mobile to base station) and forward link (base station to mo-bile) usingan MC-CDMA with antenna array, thus increasing the system’s user-capacity.
Computer simulations that demon-strate user-capacity improvement of the proposed approach are discussed. key words: MC-CDMA, DS. Adaptive Antenna Applications.- Adaptive Beamforming Performance in Micro- and Macro-Cell Propagation Scenarios.- High Performance Path Searcher for CDMA Adaptive Antenna Systems.- Analog Smart Antennas.- Polarimetric Array Processing for Nonstationary Signals.- Optical Beamforming for Phased Array Antennas.- Mirroring Properties of Sub-band Price: $ The book is designed to serve as an informative reference for the researcher involved in the analysis of the spatial signal processing techniques for smart antenna systems.
The book will help the readers, in particular wireless communication researchers, to have wider futuristic and innovative visions for the advances in the field. This paper considers the performance of a DS-CDMA system which employs adaptive antenna technology at the base station site, for both the umbrella and the micro-cells in a mixed cell structure.
The possible advantages from such a deployment are discussed before presenting some initial results from a new adaptive antenna simulation model. This exploits the capabilities of ray tracing to. This practical book covers a wide range of antenna array topics that are becoming increasingly important in wireless applications, with emphasis on array design, applications, and computer modeling.
Each chapter in Antenna Arrays builds upon the previous chapter, progressively addressing more difficult material. This paper proposes a DS/CDMA coherent detection system using a suppressed pilot channel to achieve coherent RAKE diversity combining for up-link land mobile communication systems.
At the receiver we apply a chip timing recovery scheme based on block demodulation and maximum likelihood estimation, and measure the complex delay profile. Proposed adaptive RAKE diversity performance in the case.This thesis presents techniques for the design of adaptive array antennas which will enable their cost effective implementation in wireless communication systems.
The techniques are investigated from three perspectives, namely, reconfigurable antenna design, wide scan array design and single-port beamforming technique.An adaptive antenna array employs selective polarization nulling and spatial nulling to receive desired signals in the presence of jamming signals.
The desired signals have the same circular polarization, and the array includes at least one antenna element having an opposite circular polarization to null jamming signals having an opposite circular polarization.