Pulse or digital communications – Transceivers – Modems
Reexamination Certificate
2007-04-10
2007-04-10
Tran, Khanh (Department: 2611)
Pulse or digital communications
Transceivers
Modems
Reexamination Certificate
active
10294048
ABSTRACT:
All digital reference frequency locking. An all digital approach is provided for operation within one or more CMs within a cable modem communication system to lock the upstream of the one or more CMs to the downstream symbol clock provided from a CMTS. The locking of the CM's upstream may be performed using one of at least three different functions: (1) Locking the upstream symbol clock phase to the downstream symbol clock phase, (2) Locking the downstream symbol clock phase to the headend reference clock phase (typically 10.24 MHz or integer multiple thereof), and (3) Locking the upstream carrier frequency to the downstream symbol clock frequency. The all-digital techniques for supporting all digital reference frequency locking functionality provide high performance to support S-CDMA and other synchronous modulation techniques.
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Bhaskaran Ravi
Cavallo James P.
Currivan Bruce J.
Kolze Thomas J.
Lee Tak K.
Ahn Sam K.
Broadcom Corporation
Garlick & Harrison & Markison
Short Shayne X.
Tran Khanh
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