Timing recovery apparatus and a diversity communication apparatu

Details Timing recovery apparatus and a diversity communication apparatu Timing recovery apparatus and a diversity communication apparatu

1996-10-31

1999-05-18

Chin, Stephen

Pulse or digital communications

Synchronizers

Synchronizing the sampling time of digital data

375371, H04L7/00

Patent

active

059057670

ABSTRACT:
The timing recovery apparatus and the diversity communication apparatus using the same realizes a high-speed timing phase pull-in characteristic and a low-jitter characteristic at the time of power-on sequence, recovery from line disconnection and the like. The apparatuses also prevent the bit error rate characteristic and synchronization characteristic from being deteriorated by signal delay time difference. A received PSK signal is X-times oversampled. From received phase data sequences Y.sub.i obtained by the X-times oversampling, a data sequence including j symbol frequency components not affected by carrier frequency deviation is extracted by signal processing including simple adding and subtracting operations. The data sequence including j symbol frequency components is synthesized to provide two data sequences including symbol frequency components having a good S/N ratio with .pi./4 phase difference in radian and not affected by carrier frequency deviation. Further, a data sequence including two symbol frequency components is used for timing regeneration.

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