P. A. L'vov

Bio: P. A. L'vov is an academic researcher. The author has contributed to research in topics: Linear approximation & Quadric. The author has an hindex of 2, co-authored 2 publications receiving 16 citations.

A novel parameter estimation technique for software defined radio system based on broadband multi-port receiver

Abstract: A new universal technique for communication signal parameter estimation of a software defined radio system with an arbitrary multi-port receiver based on solution of its quadric equations by the maximum likelihood method is proposed. The expressions for error matrix of estimating parameters are obtained in linear approximation that allows one to investigate analytically the uncertainties of estimaiton. An optimisation method of multi-port junction parameters for measurement in very wide frequency range is described. The results of computer simulation confirming the theoretical conclusions are given.

Statistical approach to measurements with microwave multi-port reflectometer and optimization of its construction

Abstract: A new universal technique for microwave load complex reflection coefficient estimation with an arbitrary multiport reflectometer based on the solution of its quadric equations by the maximum likelihood method is proposed. The expressions for error matrix of estimating parameters are obtained in linear approximation that allows one to investigate analytically the measuring uncertainties. An optimization method of multiport parameters for measurement in narrow and wide frequency ranges is described. The results of computer simulation confirming the theoretical conclusions are given.

Six-port Reflectometer with Kalman Filter Processing of Sensor Signals

Abstract: In modern microwave measurements the six-port reflectometers and receivers are used in telecommunications, radiolocation, medicine, Internet of things. The signal processing is based on the algorithms and models that using the redundant information and is aimed at accuracy improving and uncertainty reducing. The Kalman filter is proven to be helpful in signals with errors processing. There was proposed a finite state machine (FSM) with such states as prediction and update for Kalman filter algorithm and its simulation with the help of field programmable gate array (FPGA).

Model and Algorithms for Microwave Mutiport Receiver

Abstract: The six-port receiver is very perspective in wireless application as it much cheaper than receivers with heterodyne transformation because vector information about not only modulus but phase too is derived from scalar sensor signals by processing with algorithms. There was considered principle of action of six-port receiver, mathematical model of six-port receiver, using redundancy in the algorithms for six and more port receiver in the report. There was proposed how to provide phase and clock synchronization. There was proposed constellation diagram obtained by simulation. Due to described filters the error vector magnitude (EVM) decreases almoust 10 times

Mathematical Modeling and Calibration Procedure of Combined Multiport Correlator

Abstract: Increasing amounts of information transmitted-by-the-air provides an expansion of the data transmission bandwidth and an increase in the requirements for transmitting and receiving devices. This problem can be solved with the help of software defined radio systems (SDR).

Analysis of modern techniques for automatic measurements in microwaves

Abstract: The analysis of modern techniques used for automatic measurements in microwaves is given in the paper. The advantages and drawbacks of two mainstream automatic network analyzers are discussed. The conventional measuring technique based on vector voltmeter (VV) is very accurate, so it is taken as a basis of almost all commercially available meters. However, it is based on the frequency down conversion; therefore, these meters include a large amount of expensive equipment, since they are very complicate and expensive. The second method of multi-port reflectometer (MPR) uses the power detectors for measurement of the output signals. Theoretically the equipment of this method is less complicated and expensive. But the calibration of the MPR is very difficult since it requires a large kit of precisely known standards that are available only for a few instrumentation engineers. That is why MPR did not are not widely used and are not commercially available. The special case of MPR is the multi-probe transmission line reflectometer (MTLR), which accuracy is less, but it can be precisely calibrated without any exactly known calibration standard. So, we put forward the idea of the combined MPR use. It consists of the conventional MPR being connected to MTLR. This structure can be calibrated without known standards and its accuracy is higher than the accuracy of the conventional MPR. Moreover, it becomes possible to unify the methods of VV and combined MPR, making the resulted meter less expensive and more accurate. The advantages of combined MPR are discussed.

The Microwave Oven Thermal Field Uniformity Increasing by Using Powermeter

Abstract: The microwave oven qualities improvement can be achieved, if use a powermeter. Extracting information about the passing power from the sensor signals in the powermeter can be performed by determining the passing power as a geometric mean of the sensor signals. The main advantage of this approach is ease of automation. The limitations of the passing power calculating algorithm as a geometric mean of two sensors signals are that mathematically rigorous expressions. It can be obtained only if two sensor signals are taken at the maximum and minimum of the standing wave. When the sensors was not placed in the maximum and minimum of the standing wave, the error appears. An amendment was made, and the non-excluded residual was estimated.