Abstract: A reconfigurable radio frequency communication system. The system includes a receiver subsystem and a signal processing system. The receiver subsystem may be configured to operate in the receiver or transmitter mode of operation. The receiver subsystem may also be configured to handle a plurality of signaling schemes and waveforms. The signal processing system may be tailored with corresponding parameters for performing polar conversion, trellis modulation decoding, and frequency estimation and control.

Abstract: A decoder for Trellis encoded modulated signals. The decoder utilizes a modified Viterbi algorithm. The algorithm includes the use of two look-up tables. The look-up tables contain information regarding the current symbol, previous symbol and previous to previous symbol which can bring the trellis to the given state. The symbol information contained within these tables is indexed into the appropriate branch metric values and the path metric for the Viterbi algorithm is computed. The tables can be used effectively with the branch metric in either polar or rectangular form.