Methods and apparatus for reducing signal degradation

Details Methods and apparatus for reducing signal degradation Methods and apparatus for reducing signal degradation

2006-08-01

2006-08-01

Patel, Jay K. (Department: 2634)

Pulse or digital communications

Repeaters

Including pulse regeneration or conversion

C375S211000, C455S007000

Reexamination Certificate

active

07085314

ABSTRACT:
A single frequency relay station receives a signal from a master station, and retransmits it. Before retransmitting the signal, the relay station uses a digital filter to subtract from the signal components which arise from multipath interference and coupling interference. The coefficients used by the digital filter are derived from characteristics of the multipath interference and the overall transfer function of the relay station. These are derived by turning off the retransmission, so that the multipath interference can be estimated from the received signal, and commencing the retransmission again, to determine the transfer function. A simplified inverse fast Fourier transform is used to simplify the calculations.

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