System and method for phase recovery in a synchronous communication system

• US 6,307,869 B1
• Filed: 07/07/1998
• Issued: 10/23/2001
• Est. Priority Date: 07/07/1998
• Status: Expired due to Term

• Current Assignee: WSOU Investments, LLC (WSOU Holdings, LLC)
• Original Assignee: Lucent Technologies, Inc. (Nokia Corporation)
• Inventors: Pawelski, Robert Lee
• Primary Examiner(s): CANGIALOSI, SALVATORE A
• Application Number:
  US09/111,597
• Time in Patent Office: 1,204 Days
• Field of Search: 370/516, 370/519, 375/220, 375/371
• US Class Current: 370/516
• CPC Class Codes: H04J 3/0682 by delay compensation, e.g. by compensation of propagation delay or variations thereof, by ranging
• CPC Class Codes: H04L 7/0337 Selecting between two or more discretely delayed clocks or selecting between two or more discretely delayed received code signals
• CPC Class Codes: H04L 7/041 using special codes as synchronising signal

Abstract

A system and method is provided for generating a sequence of phase signals. One of the sequence of phase signals that is most closely aligned with a data packet is selected. The data packet is phase aligned with the selected one of the sequence of phase signals. The phase alignment of the data packet includes the generation of a clock signal in alignment with one of the sequence of phase signals.

Claims

1. A method for allowing recovery of upstream data, characterized by the steps of:

determining a recovered upstream data clock through employment of a downstream data clock;

determining recovered output through employment of data that is based on the upstream data; and

employing the recovered upstream data clock and the recovered output to allow recovery of the upstream data through processing of the recovered output.

2. The method of claim 1, wherein the step of determining the recovered upstream data clock through employment of the downstream data clock and the step of determining the recovered output through employment of the data that is based on the upstream data comprise the steps of:

generating a plurality of phase signals; and

determining a closest match between one of the plurality of phase signals and the data that is based on the upstream data.

3. The method of claim 2, wherein the step of determining the recovered upstream data clock through employment of the downstream data clock and the step of determining the recovered output through employment of the data that is based on the upstream data comprise the steps of:

employing the one of the plurality of phase signals and the data that is based on the upstream data to obtain aligned data; and

selecting the aligned data to comprise the recovered output.

4. The method of claim 1, wherein the step determining the recovered upstream data clock through employment of the downstream data clock comprises the step of deriving the recovered upstream data clock from the downstream data clock.

5. The method of claim 1, wherein the step of employing the recovered upstream data clock and the recovered output to allow recovery of the upstream data through processing of the recovered output comprises the step of employing the recovered upstream data clock to promote substantial elimination of an effect of phase delay on the recovery of the upstream data.

6. A system tor allowing recovery of upstream data, characterized by:

a phase-recovery component that determines a recovered upstream data clock through employment of a downstream data clock;

wherein the phase-recovery component determines recovered output through employment of data that is based on the upstream data; and

wherein the phase-recovery component employs the recovered upstream data clock and the recovered output to allow recovery of the upstream data through processing of the recovered output.

7. The system of claim 6, wherein the phase-recovery component comprises:

a phase circuit that Generates a plurality of phase signals; and

a combination circuit that determines a closest match between one of the plurality of phase signals and the data that is based on the upstream data.

8. The system of claim 7, wherein the phase-recovery component comprises a phase-alignment circuit that employs the one of the plurality of phase signals and the data that is based on the upstream data to obtain aligned data, and wherein the phase-recovery component selects the aligned data to comprise the recovered output.

9. The system of claim 6, wherein the phase-recovery component derives the recovered upstream data clock from the downstream data clock.

10. The system of claim 6, further comprising a switch that employs the recovered upstream data clock to promote substantial elimination of an effect of phase delay on the recovery of the upstream data.