Abstract:

The optimal tree structure is searched to reduce the sum of ISI and ICI powers（integrated power）from the points of bit error rate（BER）performance and lower complexity. Firstly, to select the lower integrated power structures from all wavelet packet trees, based on the effect of wavelet packet modulation structures in themselves, then, calculate the mean square error of signal modulated by the lower integrated power structures, the optimal wavelet packet tree could be decided. The simulation results show that this optimum wavelet packet tree has simple structure and good BER performance.

Key words: wavelet packet modulation, intersymbol interference, intercarrier interference, mean square error, bit error ratio