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Signal-synchronization-method-and-receiver-device-for-packet-communication

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Signal synchronization method and receiver device for packet communication

Details

Inventors: Sawada, Manabu; Kuwabara, Masahiro;
Assignee: DENSO Corporation (Kariya, JP)
Primary Examiner: Rao; Seema S.
Assistant Examiner: Mills; Donald L
Attorney, Agent or Firm: Harness, Dickey & Pierce, PLC

A receiver device for a packet communication system receives a packet signal appended at its head with a known number (N) of repetition signals. A correlation value of a received signal is outputted from a normalizing correlator and compared with a threshold value in a comparator. The output of the comparator is inputted to a synchronization signal generating circuit, which includes M (.ltoreq.N-1) delay elements connected in series and an AND circuit for taking the logical product of the outputs of the delay elements. When the output of the comparator is high-level and the outputs of the M delay elements 431 are also all high-level, a synchronization signal at symbol timing is outputted from the AND circuit.

DETAILED DESCRIPTION It is therefore an object of the present invention to provide a signal synchronization method and a receiver device which is capable of generating a synchronization signal easily.
According to this invention, a signal synchronization method and a receiver device conduct packet communication in bursts.
A packet signal is appended at its head with a known number of repetition signals.
A correlation value of a received signal of the packet signal is determined.
The correlation value is compared with a threshold value, and a synchronization signal is generated when repetitiveness of the results of the comparison is recognized.
Here, "conducts packet communication in bursts" means conducts packet communication in a non-continuous form, wherein synchronization is not made.
Preferably, the results of the comparison are successively delayed, and the repetitiveness is recognized on the basis of delayed outputs of the comparison results.

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