Affiliations: [a] Karpagam University, Coimbatore, Tamil Nada, India | [b] Department of Electronics and Communication Systems, Karpagam University, Coimbatore, Tamil Nada, India
Correspondence:
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Corresponding author: S. Kalvikkarasi, Karpagam University, Coimbatore, Tamil Nada, India. E-mail:kalvikkarasis0677@gmail.com
Abstract: The Welch algorithm furnishes a good estimate of the
spectral power at the expense of high computational complexity. The primary
intension is to compute the FFT of the individual non-overlapped parts
(i.e., half of the original segments) and acquire the FFT of the overlapped
segments by merging those of the non-overlapped segments. In this paper,
initially the input discrete signal is subjected to an L / 2-point FFT and
then the two successive segments are merged to L-point segment using a
modified architecture utilizing an improved Fractional Delay Filter(FDF)
design by adapting a Multiplier less implementation for efficient
contribution. The merged segments are then subjected to a window filter,
designed using delay lines and shifters replacing the multiplier blocks.
Finally the power spectral density (PSD) is computed by computing the
periodogram and then averaging the periodogram for the windowed segments.
Complete module is realized using Xilinx_ISE software with the target
device as xc4vfx100-12-ff1152. The design is coded in verilog HDL. The
functional verification of the proposed design reported a PSD with an error
of 5.87% when compared with the similar Matlab PSD computation. The
synthesis results confirm the efficiency and computational complexity
reduction of the proposed architecture when comparing with similar existing
researches.
