Appeal No. 2006-3182
Application No. 09/883,963
vehicle de-spreading means (6, 7, 8) for de-spreading a response signal received unless a
pseudo-random code carried by the response signal is not synchronized in substantial correlation
with a corresponding pseudo-random code stored in the vehicle memory means (7) by a time
shift less than required for an intermediate transmission means to intercept and retransmit a
response signal, and for verifying whether the received signal carries a signature of a user
transmission means; and
user transmission/reception means (9, 10, 11) intended to be carried by a user for
transmitting the response signal for controlling unlocking actuation of the operable panel,
comprising
user memory means comprising a user circular shift register (13) in which is stored the
pseudo-random code;
user de-spreading means (12, 13, 14) for de-spreading the transmission signal received
unless the pseudo-random code carried by the interrogation signal is not synchronized in
substantial correlation with a corresponding pseudo-random code stored in the user memory
means (13) by a time shift less than required for an intermediate transmission means to intercept
and retransmit the interrogation signal; and
the user transmission means (9, 12, 13, 14) for transmitting the response signal which
carries the pseudo-random code and the signature which is specific to the user
transmission/reception means.
References
The Examiner relies on the following references:
Lambropoulos 5,736,935 Apr. 7, 1998
Bates 6,057,779 May 2, 2000
(Filed on Aug. 14, 1997)
Ziemer et al. (Ziemer), Digital Communications and Spread Spectrum Systems, MacMillan
Publishing Company (1985) pp.332-340.
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