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Using the matrix pencil method to estimate the parameters of a sum of complex exponentials

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2 Author(s)
Sarkar, T.K. ; Dept. of Electr. & Comput. Eng., Syracuse Univ., NY, USA ; Pereira, O.

The approximation of a function by a sum of complex exponentials is a problem that is at least two centuries old. Fundamentally, all techniques discussed in this article proceed from using the same sequence of data samples and vary only, but importantly, in how those samples are used in achieving the parameter estimation. All of these techniques, in other words, seek the same quantitative parameters to represent the sampled data, but use different routes to get there. The techniques for estimating the parameters are either linear or nonlinear. The linear techniques are emphasized in this presentation. In particular, the matrix pencil method is described, which is more robust to noise in the sampled data. The matrix pencil approach has a lower variance of the estimates of the parameters of interest than a polynomial-type method (Prony's method belongs to this category), and is also computationally more efficient. A bandpass version of the matrix pencil can be implemented in hardware, utilizing an AT&T DSP32C chip operating in real time. A copy of the computer program implementing the matrix pencil technique is given in the appendix.<>

Published in:

Antennas and Propagation Magazine, IEEE  (Volume:37 ,  Issue: 1 )

Date of Publication:

Feb. 1995

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