Research Article
Spectrum-Efficient Cognitive Radio Transceiver Using Multiwavelet Filters
1: The iteration parameter is initialized to zero. The input signal is converted into a matrix of two rows by repeating | the signal. | 2: The low pass and high pass filter toeplitz matrices of the corresponding iteration are calculated. | 3: The Multiwavelet packet coefficients are obtained. | 4: Check whether the required iteration level is achieved. If yes go to next step. Otherwise increase the iteration parameter and | repeat step 2 and 3. | 5: If the required iteration level is reached the wavelet packet coefficients are saved and energy of the subbands are calculated. | 6: The power spectral density is obtained and is compared with the predefined threshold. | 7: Preliminary decision on vacant spectrum is taken based on step 6. |
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