MULTIPATH PARAMETER ESTIMATION IN SPREAD-SPECTRUM COMMUNICATIONS SYSTEMS

摘要

A training circuit includes resources for processing magnitude and phase information received in a main propagation path signal with magnitude and phase information concurrently received in a secondary propagation path signal to determine values for magnitude, phase, and time offset of the secondary propagation path signal relative to the main propagation path signal. The training circuit can identify time offsets less than or greater than a symbol period, for either leading or lagging secondary path time offsets. A phase difference circuit, further included in the training circuit, determines a phase offset for the secondary propagation path signal relative to the main propagation path signal using main and secondary propagation path symbol phase values in combination with the time offset information. The relative magnitude, phase, and time information represents a characterization of the secondary propagation path with respect to the main propagation path.