Table 1 Computational complexity of the existing and proposed methods are summarized
| Â | RintW, time | RintC (proposed), time |
|---|---|---|
preprocessing | O(N2) | O(N2) |
main calculation | O(N5/U) | O(N2W3/U) |
postprocessing (DFT) | O(N4/U) | O(N3W/U) |
postprocessing (FFT) | O(N3logN/U) | O(N2WlogN/U) |
total (DFT) | O(N5/U) | O(N2W(W2+N)/U) |
total (FFT) | O(N5/U) | O(N2W(W2+logN)/U) |
| Â | RintW, space | RintC (proposed), space |
preprocessing | O(N2) | O(N2) |
main calculation | O(N3U) | O(N2WU) |
postprocessing (DFT) | O(NU) | O(NU) |
postprocessing (FFT) | O(NU) | O(NU) |
total (DFT) | O(N3U) | O(N2WU) |
total (FFT) | O(N3U) | O(N2WU) |