Abstract: The programmable decoder, such as a Maximum Likelihood Sequence Estimation (MLSE) decoder (e.g. a Viterbi decoder) may include a programming input for a plurality of programmable trellis parameters, and a programmable device, such as an FPGA, connected to the programming input and implementing a continuous phase modulation (CPM) decoder including at least one trellis structure defined based upon the plurality of programmable trellis parameters. The plurality of programmable trellis parameters may include a number of trellis structures, a number of trellis states for each trellis structure, and a number of branches for each trellis state. Also, the trellis structure may include a reverse-state trellis structure.

Abstract: The programmable decoder, such as a Maximum Likelihood Sequence Estimation (MLSE) decoder (e.g. a Viterbi decoder) may include a programming input for a plurality of programmable trellis parameters, and a programmable device, such as an FPGA, connected to the programming input and implementing a trellis decoder including at least one trellis structure defined based upon the plurality of programmable trellis parameters. The plurality of programmable trellis parameters may include trellis connectivity information for trellis stages, active and inactive states for each trellis stage, a trellis branch transition data value and a metric index for trellis branch transition. Also, the trellis structure may include a reverse-state trellis structure. The programmable trellis decoder can decode convolutional codes, trellis coded modulation (TCM), ISI channels and CPM waveforms.

Abstract: A method and apparatus for improving the bandwidth efficiency of a constant envelope continuous phase modulation waveform and transmitting data in a bandwidth efficient manner is disclosed. The method and apparatus utilizes a non-constant envelope continuous phase modulation signal which possesses many of the advantages of a multiple modulation index continuous phase modulation signal. One such advantage is the natural trellis structure of a multiple modulation index continuous phase modulation signal. In comparison to a constant envelope continuous phase modulation waveform, the non-constant envelope continuous phase modulation signal possesses a reduced transmit signal spectra and may also be demodulated by a standard maximum likelihood demodulator without any loss of performance.

Abstract: The programmable decoder, such as a Maximum Likelihood Sequence Estimation (MLSE) decoder (e.g. a Viterbi decoder) may include a programming input for a plurality of programmable trellis parameters, and a programmable device, such as an FPGA, connected to the programming input and implementing a trellis decoder including at least one trellis structure defined based upon the plurality of programmable trellis parameters. The plurality of programmable trellis parameters may include trellis connectivity information for trellis stages, active and inactive states for each trellis stage, a trellis branch transition data value and a metric index for trellis branch transition. Also, the trellis structure may include a reverse-state trellis structure. The programmable trellis decoder can decode convolutional codes, trellis coded modulation (TCM), ISI channels and CPM waveforms.

Abstract: The programmable decoder, such as a Maximum Likelihood Sequence Estimation (MLSE) decoder (e.g. a Viterbi decoder) may include a programming input for a plurality of programmable trellis parameters, and a programmable device, such as an FPGA, connected to the programming input and implementing a continuous phase modulation (CPM) decoder including at least one trellis structure defined based upon the plurality of programmable trellis parameters. The plurality of programmable trellis parameters may include a number of trellis structures, a number of trellis states for each trellis structure, and a number of branches for each trellis state. Also, the trellis structure may include a reverse-state trellis structure.

Abstract: A radio system demodulates a continuous phase modulation waveform with a pulse count demodulator. The use of a pulse count demodulator reduces the receiver complexity and reduces power consumption, which makes such a system well suited for hand held or mobile units. The pulse count demodulator delays the CPM signal by a time increment t0, and subtracts the delayed signal from the original signal creating a difference signal. The difference signal is rectified and low pass filtered resulting in an average signal representing the phase change. In non-square wave CPM signals, the signal is first clipped removing the amplitude information.

Abstract: A system and method of automatic gain control (AGC) processing of digital signals using Block AGC to acquire the signal and sample-by-sample AGC to track the signal.

Abstract: A radio system demodulates a continuous phase modulation waveform with a pulse count demodulator. The use of a pulse count demodulator reduces the receiver complexity and reduces power consumption, which makes such a system well suited for hand held or mobile units. The pulse count demodulator delays the CPM signal by a time increment to, and subtracts the delayed signal from the original signal creating a difference signal. The difference signal is rectified and low pass filtered resulting in an average signal representing the phase change. In non-square wave CPM signals, the signal is first clipped removing the amplitude information.

Abstract: A system and method of automatic gain control (AGC) processing of digital signals using Block AGC to acquire the signal and sample-by-sample AGC to track the signal.