Method and apparatus for accurate synchronization using symbol decision feedback
First Claim
1. A method for accurate synchronization using symbol decision feedback on a symbol by symbol basis by determining an optimal sampling phase using a current symbol decision in a circuit having a plurality of correlators, comprising the steps of:
- selecting the correlator output corresponding to the current symbol decision during the current symbol period generated by a current synchronization clock providing the selected correlator output;
estimating the optimal sampling phase of the current symbol period from the selected correlator output to provide an adjustment signal;
adjusting a subsequent symbol'"'"'s synchronization clock pulse based upon the adjustment signal.
19 Assignments
0 Petitions
Accused Products
Abstract
A circuit (12) for symbol decision directed feedback synchronization includes a current synchonization clock (45) that provides an initial sampling point and selects a detector corresponding to a current symbol decision. The circuit further includes a plurality of detectors (31, 32, 33, and 34) including the detector corresponding to the current symbol decision, a buffer (736) for storing the output of the detector corresponding to the current symbol decision and a processor (300) for seeking within a predetermined window about the initial sampling point for an optimum phase value to provide an adjustment signal which is used by the processor to adjust a subsequent symbol'"'"'s sychronization clock to provide an optimal sampling point.
-
Citations
18 Claims
-
1. A method for accurate synchronization using symbol decision feedback on a symbol by symbol basis by determining an optimal sampling phase using a current symbol decision in a circuit having a plurality of correlators, comprising the steps of:
-
selecting the correlator output corresponding to the current symbol decision during the current symbol period generated by a current synchronization clock providing the selected correlator output; estimating the optimal sampling phase of the current symbol period from the selected correlator output to provide an adjustment signal; adjusting a subsequent symbol'"'"'s synchronization clock pulse based upon the adjustment signal. - View Dependent Claims (2, 3, 4, 5, 6)
-
-
7. A circuit for symbol decision directed feedback synchronization, comprising:
-
a current synchonization clock that provides an initial sampling point and selects a detector corresponding to a current symbol decision; a plurality of detectors including the detector corresponding to the current symbol decision; a buffer for storing the output of the detector corresponding to the current symbol decision; and a processor for seeking within a predetermined window about the initial sampling point for an optimum phase value to provide an adjustment signal during the current symbol period, wherein the processor further adjusts a subsequent symbol'"'"'s sychronization clock in accordance with the adjustment signal to provide an optimal sampling point. - View Dependent Claims (8, 9, 10, 11, 12)
-
-
13. A selective call receiver unit capable of receiving synchronous signals, comprising:
-
a selective call receiver; a demodulator coupled to the selective call receiver; and a circuit coupled to the demodulator for symbol decision directed feedback synchronization, comprising; an current synchonization clock that provides an initial sampling point and selects a detector corresponding to a current symbol decision; a plurality of detectors including the detector corresponding to the current symbol decision; a buffer for storing the output of the detector corresponding to the current symbol decision; and a processor for seeking within a predetermined window about the initial sampling point for an optimum phase value to provide an adjustment signal during the current symbol period, wherein the processor further adjusts a subsequent symbol'"'"'s sychronization clock in accordance with the adjustment signal to provide an optimal sampling point. - View Dependent Claims (14, 15, 16, 17, 18)
-
Specification