Nonlinear Filtering and Array Computation

The architecture of the array processor is well suited to signal processing problem and the numerical solution of partial differential equations. The authors application concerns developing code to build the best phase demodulator for use in areas such as deep-space and submarine communications. The current linear design, known as the phase-lock loop, is suboptimal. The approach was to synthesize a nonlinear filter, addressing three specific problems. They used the floating point systems AP-120B array processor in conjunction with the DEC PDP 11-55 for all implementations and found the configuration much more economical than conventional means. Before going into detail on the efficiency of this system, however, they discuss the nature of the signal processing, or filtering, problem in terms of the filtering equations involved. 10 references.