Method and apparatus for clock timing recovery in χDSL...

Details Method and apparatus for clock timing recovery in χDSL... Method and apparatus for clock timing recovery in χDSL...

2005-07-26

2005-07-26

Ghebretinsae, Temesghen (Department: 2637)

Pulse or digital communications

Transceivers

Modems

C375S326000, C375S328000

Reexamination Certificate

active

06922436

ABSTRACT:
Method and modem for fast timing recovery of transmitted data between a master χDSL modem and a slave χDSL modem, over a noisy, high loss, high distortion wiring. Transmitted QAM symbols are received and sampled at the slave modem. The sampled data is split into in-phase and quadrature channel, each of which is filtered by matched filter. The filtered outputs are sampled at twice the symbol rate and the lower and upper band edge components are extracted by modulating each of the sampled sequences of outputs with two discrete time sequences: cos(0.5 π n)=. . . 1,0,−1,0 . . . and sin(0.5 π n)=. . . 0,1,0,−1 . . . . Each of the resulting products is filtered with a first order low-pass filters and re-sampled again at the symbol rate. The Bit Error Rate is computed, and the slave modem switches from blind timing recovery mode, to data directed timing recovery mode, after the Bit Error Rate has sufficiently decreased.

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patent: 6308057 (2001-10-01), Hayashi
patent: 6449325 (2002-09-01), Limberg
patent: 6526101 (2003-02-01), Patel

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