Design and application of multifrequency signals

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Design and application of multifrequency signals

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© The Institution of Electrical Engineers
Published

The use of the fast Fourier transform (FFT) algorithm in commercially available and custom-built digital spectrum analysers has resulted in an increasing interest in system identification in the frequency domain. Historically, pseudorandom binary signals have been widely used as perturbation signals for system identification because they are easy to generate using simple shift-register circuitry, which has resulted in their incorporation in a number of signal generators. However, their properties are not particularly well suited to frequency-domain system identification. This has led to the design of more suitable signals for this type of identification, but these have tended to remain primarily a research tool because they have not been easy to generate. This problem has largely disappeared with the widespread availability of programmable read only memories and some of these designs are just beginning to appear on commercial hardware and software packages. It is timely, therefore, to review some of these other designs.

Inspec keywords: computerised signal processing; identification; spectral analysis

Other keywords: digital spectrum analysers; perturbation signals; frequency domain; programmable read only memories; multifrequency signals; pseudo-random binary signals; fast fourier transform; system identification

Subjects: Digital signal processing; Signal processing and detection; Communications computing

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