What is HPSK (Hybrid Phase Shift Keying)?

Hybrid Phase Shift Keying utilized in WCDMA because it has a low phase average ratio. This low ratio of peak to average power results in decreasing the quantity of zero crossing of transitions of the output transmitted signal. HPSK is an intricate spreading plan that is intended to limit the zero-crossing signal transition. There is a possibility that signal transitions of HPSK go through zero.