Mobile communications system insensitive to false frame sync

Details Mobile communications system insensitive to false frame sync Mobile communications system insensitive to false frame sync

1990-07-13

1992-04-28

Chin, Stephen

Pulse or digital communications

Spread spectrum

Direct sequence

375116, 3701051, H04L 700

Patent

active

051093936

ABSTRACT:
In a mobile communication system, the base station sequentially scans speech channels and a control channel to monitor call status and detect a call request from a mobile station containing a frame sync and an encoded user's identifier. A successive bit sequence of the call request signal is stored into first and second buffers. A first count value is derived to represent a count of bits stored into the first buffer substantially from the instant an earlier one of two successively detected sync codes is detected, and a second count value is derived to represent a count of bits stored into the second buffer substantially from the instant a later one of the sync codes is generated. When the first and second count values respectively reach a prescribed value, the corresponding one of the buffers is triggered and the bit sequence in the triggered buffer is loaded into a decoder in which it is decoded and checked against a stored version of the user's identifier. If there is a match between them, a signal is transmitted to the mobile station indicating that the call request is accepted. In a modified embodiment, a single buffer is provided and a count value is incremented in response to each of two successively detected sync codes if they are spaced apart by a longer interval, or in response to an earlier one of these sync codes if they are spaced apart by a smaller interval. The bit sequence in the single buffer is loaded into the decoder when the single count value reaches a prescribed value.

REFERENCES:
patent: 4506372 (1985-03-01), Massey et al.
patent: 4562574 (1985-12-01), Kambayashi
patent: 4747116 (1988-05-01), Yatima
patent: 4779087 (1988-10-01), Fukuda et al.
patent: 4937843 (1990-06-01), Takemoto
patent: 4974225 (1990-11-01), Chenier et al.
patent: 4984238 (1991-01-01), Watanabe et al.

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