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Showing papers on "MIMO published in 1989"


Book
01 Jan 1989
TL;DR: The author provides a unifying framework for signalling design which allows the channel constraints to be represented geometrically and permits the use of modem design principles from electrical channels.
Abstract: Wireless Optical Communication Systems addresses the problem of designing efficient signaling and provides a link between the areas of communication theory and modem design for amplitude constrained linear optical intensity channel. Topics include historical perspective, channel impairments, amplitude constraints and the characteristics of popular optoelectronic components. A variety of wireless optical channel topologies are presented along with a survey and analysis of present day signalling techniques employed for these channels. The author provides a unifying framework for signalling design which allows the channel constraints to be represented geometrically and permits the use of modem design principles from electrical channels. Modulation schemes are designed using the formalism of lattice codes and a design process for signalling sets is specified. The use of multiple-input/multiple-output (MIMO) wireless optical channels to improve the spectral efficiency of links is explored. The basic spatio-temporal modem design problem is specified and a spatial multiplexing gain is quantified. New spatial discrete multitone modulation is proposed and the unique features are discussed. Based on measurements on an experimental prototype, a channel model is formulated and a realizable spatio-temporal coding scheme is simulated to quantify performance gains. This volume is organized for professional and academic readers engaged in modem design for wireless optical intensity channels. Significant background material is presented on both the properties as well as on fundamental communications principles. Wireless Optical Communication Systems can be used by physicists and experimentalists as an introduction to signalling design as well as communication systems designers.

317 citations


01 Jan 1989
TL;DR: In this paper, a processus de production de tubes de verre is described, and l'identification a des modeles fixes permet l'amelioration a la fois dans the dynamique du processus and dans la reduction des perturbations.
Abstract: On prend l'exemple d'un processus de production de tubes de verre et on montre que l'identification a des modeles fixes permet l'amelioration a la fois dans la dynamique du processus et dans la reduction des perturbations

18 citations


Journal ArticleDOI
01 Sep 1989
TL;DR: In this paper, an implicit MIMO self-tuning controller is proposed for processes with unknown or varying time delays, which is designed to cope with variations in the time delays associated with both the control input and the measurable disturbance signal.
Abstract: In the paper, an implicit MIMO self-tuning controller is proposed for processes with unknown or varying time delays. The algorithm presented is designed to cope with variations in the time delays associated with both the control input and the measurable disturbance signal. The controller combines the classical control strategy of pole assignment with the optimal approach of self-tuning control and realises the decoupling of the control loops dynamically as well as in the steady state. The advantages of the new MIMO algorithm are illustrated with two examples.

5 citations


Journal ArticleDOI
TL;DR: An exactly stable configuration for infinite-impulse-response MIMO identification is proposed, by forcing some entries of the PARCOR matrices in the maximum-entropy lattice algorithms to be zero.
Abstract: The authors propose an exactly stable configuration for infinite-impulse-response MIMO identification, by forcing some entries of the PARCOR matrices in the maximum-entropy lattice algorithms to be zero. For arbitrary input, the estimated transfer function is ensured to be exactly stable without the need of test. For AR (autoregressive) input, the transfer function estimate is consistent. Applications to SISO identification are also presented. >

2 citations


Journal ArticleDOI
M. A. FKIRlN1
TL;DR: In this paper, various model forms for the on-line identification of multi-input multi-output (MIMO) stochastic dynamic systems are reviewed, including the transfer function matrix, input-output difference equation, state-space representation, and decomposition form.
Abstract: Various model forms for the on-line identification of multi-input multi-output (MIMO) stochastic dynamic systems are reviewed. These models are the transfer function matrix, input-output difference equation, state-space representation, and decomposition form. The number of parameters to be identified and the structural parameters required to characterize each model are tested and compared. Results show that the decomposition form is very powerful for solving structure and parameter estimation problems of MIMO systems.

2 citations


Journal ArticleDOI
TL;DR: A new data acquisition and control software package for IIP 9000/300 series UNIX workstations is presented and single-input single-output (SISO) and multivariable (MIMO) control algorithms implemented in the software are reviewed.

2 citations


Proceedings ArticleDOI
14 Aug 1989
TL;DR: It is shown that any of the three basic features of the Smith predictor can be extended to MIMO systems in the input-output configuration and it is believed that the scheme simplifies implementation of delay selection procedures.
Abstract: Generalized input-output compensation of MIMO (multiinput, multioutput) systems with time delays is considered. It is shown that any of the three basic features of the Smith predictor can be extended to MIMO systems in the input-output configuration. A selection scheme that does not require the inverse of the plant transfer matrix is devised for plant delays in reducing diagonal delay elements in the decoupling response bound. It is believed that the scheme simplifies implementation of delay selection procedures. >

1 citations


Proceedings ArticleDOI
Oded Yaniv1
03 Apr 1989
TL;DR: In this paper, the Horowitz design method for uncertain MIMO feedback systems is extended to meet the requirements of gain and phase margin specifications on the loop transfer function at a number of channel breaking points for all assumed plane uncertainty.
Abstract: In its present form, the Horowitz design method for uncertain multi-input-multi-output (MIMO) feedback systems can meet the demands of robustness and performance. The method is now extended to meet the requirements of gain and phase margin specifications on the loop transfer function at a number of channel breaking points for all assumed plane uncertainty. This eliminates any underdamped closed loop behavior in response to the diagonal elements. In the most general terms, time response due to disturbances, sensor noise and tracking commands will be improved. The advantages of this extended method are demonstrated by means of an example.

01 Jan 1989
TL;DR: Three adaptive control algorithms suitable for a large class of multiple-input-multiple-output (MIMO) linear systems, including in particular non minimum phase Ana/or unstable systems are compared.
Abstract: Three adaptive control algorithms are compared. They are suitable for a large class of multiple-input-multiple-output (MIMO) linear systems, including in particular non minimum phase and/or unstable systems. The first algorithm is a generalization of H. Elliott's direct arbitrary adaptive pole placement strategy. An integrating action and a specific constant matrix are introduced in the controller in order to cancel any steady state error. The second algorithm is an indirect adaptive pole placement control strategy achieving dynamic decoupling of the closed-loop system. The third algorithm is an extension of D.W. Clarke's generalized predictive control strategy to MIMO systems.