Abstract
An adaptive iterative detection structure is proposed for serially concatenated continuous phase modulation (SCCPM) on unknown channels. Joint phase synchronization and detection are implemented by means of a set of suboptimal adaptive soft-input soft-output (SISO) algorithms. The forward-only adaptive algorithms are found more robust than the forward-backward adaptive algorithms in tracking and acquiring a time-varying channel, due to rotational invariance of CPM trellis. Simulation results also show that the performance of the proposed forward-only adaptive iterative receiver closely approach that of iterative receivers with perfect knowledge of phase offset.
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