Symbol and frame synchronization in both a TDMA system and a CDM

Details Symbol and frame synchronization in both a TDMA system and a CDM Symbol and frame synchronization in both a TDMA system and a CDM

1995-02-10

1996-12-31

Tse, Young T.

Pulse or digital communications

Synchronizers

Frequency or phase control using synchronizing signal

375209, 375210, 370342, 370515, H04L 702, H04L 2730

Patent

active

055901603

ABSTRACT:
A digital radio communication system includes a receiver for receiving a signal stream that includes data frames, each frame including a data signal sequence and a synchronizing signal sequence. The communication system synchronizes the receiver by employing the signal stream. The receiver comprises: a sampling circuit for sampling symbol levels in the synchronizing signal sequence; cross correlation circuitry for comparing values derived from the sampled symbol levels with an expected set of values and producing an error value output; and correction circuitry that is responsive to the error output and produces a sample control output to the sample circuitry to alter the times of sampling of the symbol levels so as to reduce the error output and achieve time synchronization with the received synchronizing signal sequence. A further embodiment of the invention is described in relation to a CDMA receiving system.

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European Search Report dated 25 Nov. 1994 in Vienna.
"Introduction To CDMA and the Proposed Common Air Interface Specification (CAI) For A Spread Spectrum Digital Cellular Standard" Mar. 28, 1992 Qualcomm Inc, No. EX60-10010 pp. 1-58.

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