Pulse or digital communications – Transceivers
Patent
1996-07-09
1998-08-11
Pham, Chi H.
Pulse or digital communications
Transceivers
375233, 375350, 375355, H04B 140, H04B 112, H04L 700, H03H 740
Patent
active
057938016
ABSTRACT:
In a digital communications system, a sampled signal is precisely reconstructed (rather than approximated) even in situations where the phase of the sampling signal is adjusted. More particularly, the sampled signal is compensated in the frequency domain for phase adjustments to the sampling instance in the time domain. In the context of echo cancellation, an echo transfer function is generated representing the echo channel impulse response. Aliased components present in the echo impulse response are specifically identified and compensated for in the frequency domain by treating each spectral filter coefficient of the echo transfer function as the sum of a baseband component and an aliased component. In addition to accurately compensating for sampling phase adjustments, this technique considerably relaxes traditional sampling constraints.
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Luther William
Pham Chi H.
Telefonaktiebolaget LM Ericsson
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