Real-time Implementation of Vector Hilbert-Huang Transform

Hilbert-Huang Transform (HHT) is a kind of signal analysis method proposed by Huang in the late 20th century. The combination of HHT and vector signal processing is called vector HHT. To solve the problem of too much computational cost in the real-time implementation of vector HHT, this paper makes some improvement on vector HHT for real-time operation, including the improvement on sifting method, curve fitting, treatment of boundary and stop condition. Both performance and operation speed are considered in the improvement. The improved algorithm has much less computational cost, with performance basically remaining unchanged. A parallel signal processing system composed of multiple chips digital signal processor (DSP) is designed, in which vector HHT is implemented real time. The result obtained from the parallel signal processing system shows that the system met the need of data real time processing, and has good performance.