![]() Pragmatic CPM modulation schemes have recently been studied as capacity attaining low-complexity alternatives to serially concatenated CPM. Gaussian Minimum Shift Keying (GMSK), a specific form of CPM, is the main ingredient in the Global System for Mobile communications (GSM) used in GPS applications. Simulation results are used to demonstrate the validity of the combined approach.Ĭontinuous phase modulation (CPM) is a popular form of frequency modulation employed in mobile communications and has desirable spectral efficiency and constant modulus properties that facilitate use of class-C amplifiers. ![]() This combined approach avoids the problems of complexity and restrictive requirements of the Viterbi approach. In this paper, we investigate an approach that combines multirate frequency transformations for wideband CPM demodulation with decision feedback equalization for memory removal. Frequency discrimination approaches that estimate the instantaneous frequency provide a simpler suboptimal approach but are primarily for full response CPM and are not well known for wideband partial response CPM. The complexity of the Viterbi approach further increases with the number of phase states. Conventional narrowband CPM demodulation employs the Viterbi algorithm after phase demodulation and requires that the phase states be rational and contain additive white noise. ![]() Continuous phase modulation (CPM) is a popular frequency modulation technique used in mobile communications due to its power efficiency and constant modulus properties. ![]()
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