Automatic simulcast alignment

Details Automatic simulcast alignment Automatic simulcast alignment

1993-07-20

1994-10-04

Chin, Stephen

Pulse or digital communications

Repeaters

Testing

375 94, 375101, 455 512, 455 334, 3647242, H03H 730, H03H 740

Patent

active

053533070

ABSTRACT:
A digital simulcast transmission is automatically aligned, at a simulcast receiver (22) that simultaneously receives a plurality of RF signals from a plurality of transmitters, each of the RF signals being modulated to convey identical digitally encoded information. An equalizer (24) adaptively equalizes the plurality of received RF signals to substantially correct for a misalignment in time between the received signals. The misalignment in time is due in part to a non-simultaneous transmission of the identical digitally encoded information from the plurality of transmitters. Equalizer embodiments include a Decision Feedback Equalizer (DFE) and an equalizer based on a Maximum Likelihood Sequence Estimator (MLSE). Embodiments of the DFE are an Order Recursive Lattice-DFE and a Fast Kalman DFE.

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