Patent ID: 6968021

Claim:
A bandwidth efficient advanced modulation waveform modem comprising concatenated convolutional coding, interleaving, and continuous phase modulation and having a modulator connected to a transmitter to transmit signals having coded information bits over a communications channel and a demodulator connected to a receiver to receive the signals over the communications channel said demodulator comprising: a multiplier for multiplying an input signal received from the receiver and having coded information bits and a carrier by a phase signal; a memoryless demodulator connected to the multiplier for demodulating the multiplied input signal; an iterative turbo decoder connected to the memoryless demodulator for decoding the multiplied input signal; and a carrier and time tracking loop for providing the phase signal to track the input carrier and for adjusting time tracking, wherein said carrier and time tracking loop further comprises: a correlator bank connected to the multiplier for providing correlator phase estimates; a decision device connected to the memoryless demodulator for delivering alpha values representative of data symbols and hard decision phase information at a high error rate and low latency; a multiplexer connected to the correlator bank and the decision device wherein an alpha value selects phase estimate from the correlator bank utilizing the multiplexer; a symbol phase error estimator connected to the decision device and the multiplexer for producing a symbol phase error estimate from the hard decision phase information and the selected correlator phase estimate; a carrier tracking loop filter connected to the symbol phase error estimator for receiving the symbol phase error estimate and providing an output frequency; and a numerically controlled oscillator for receiving the output frequency from the carrier tracking loop filter and providing the phase signal to the multiplier to multiply the input signal to track the input carrier.