PARAMETRIC SPECTRAL ESTIMATION ON A SINGLE FPGA

Parametric, model based, spectral estimation techniques can offer increased frequency resolution over conventional short-term fast Fourier transform methods, overcoming limitations caused by the windowing of sampled, time domain, input data. However, para-metric techniques are significantly more computationally demand-ing than the Fourier based methods and require a wider range of arithmetic functionality; for example, operations such as division and square-root are often necessary. These arithmetic processes exhibit communication bottleneck and their hardware implemen-tation can be inefficient when used in conjunction with multipliers. A programmable, bit-serial, multiplier/divider, which overcomes the bottleneck problems by using a data interleaving scheme, is in-troduced in this paper. This interleaved processor is used to show how the parametric Modified Covariance spectral estimator can be efficiently routed on a field programmable gate array for real-time applications. 1