Synchronization to a base station and code acquisition within a

Details Synchronization to a base station and code acquisition within a Synchronization to a base station and code acquisition within a

1997-08-29

1999-07-27

Swann, Tod T

Cryptography

Key management

Having particular key generator

380 34, 375200, H04L 900

Patent

active

059303662

ABSTRACT:
Each transmission frame within a spread spectrum communications system relating to synchronization code transmission is divided into a plurality of slots. Each of the slots includes a primary (pilot) code c.sub.p and a secondary (combined) code c.sub.s/lci that includes information identifying or indicative of both a frame timing and a scrambling code for synchronization. This information concerning frame timing and scrambling code may be encoded in the combined code c.sub.s/lci itself, as well as in the modulation values of the sequences of plural combined codes within a frame. Alternatively, the information is encoded in the sequence of plural combined codes c.sub.s/lci transmitted in each frame, as well as in the modulated values of the sequences of plural combined codes within a frame. As yet another alternative, the information is encoded in the timing of the combined code c.sub.s/lci transmission within each slot of the frame relative to its associated primary code c.sub.p.

REFERENCES:
patent: 4943974 (1990-07-01), Motamedi
patent: 5416797 (1995-05-01), Gilhousen et al.
patent: 5778316 (1998-07-01), Persson et al.
Baier, Alfred, et al., Design Study for a CDMA-Based Third-Generation Mobile Radio System, pp. 733-743.
Higuchi, Kenichi, et al. Fast Cell Search Algorithm using Long Code Masking in DS-CDMA Asynchronous Cellular System, pp. 1-6 (with translation).

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