Pulse or digital communications – Synchronizers – Frequency or phase control using synchronizing signal
Reexamination Certificate
2005-02-01
2005-02-01
Burd, Kevin (Department: 2631)
Pulse or digital communications
Synchronizers
Frequency or phase control using synchronizing signal
Reexamination Certificate
active
06850582
ABSTRACT:
A system and method of frame synchronization and detection for use in a digital receiver within a communication system. The digital radio communication system includes a receiver for receiving a signal stream that includes data frames. Each frame includes an arbitrary data sequence and a unique word. A predetermined number of contiguous bits from the unique word are appended to the beginning of each data frame to identify the start of the data frame. The communication system comprises a sampling circuit for sampling symbol levels, a filter to implement the cross correlation of the received signal with the stored unique word, a threshold detector circuit to detect when frame synchronization is achieved as well as additional circuitry to refine the estimate from the threshold detection circuit. The design utilizes coherent demodulation. However, the design is equally applicable to non-coherent demodulation. In one embodiment, the sampling rate is assumed to be two samples per symbol. However, the functionality of the proposed design is not limited to two samples per symbol.
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Hatim Baya
Lakkis Ismail
O'Scolai Cathal
O'Shea Deirdre
Safavi Saeid
Burd Kevin
Knobbe Martens Olson & Bear LLP
Wireless Facilities, Inc.
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