Method of synchronization for code division multiple access radi

Details Method of synchronization for code division multiple access radi Method of synchronization for code division multiple access radi

1994-06-15

1996-08-06

Hsu, Alpus

Multiplex communications

Wide area network

Packet switching

370 21, 370107, 375205, 375206, 375208, 375267, 379 58, 455 561, 455 676, H04B 169, H04B 7216, H04J 1302, H04L 2730

Patent

active

055441556

ABSTRACT:
A synchronization method includes selecting, at a mobile station, at least one periodic pseudorandom sequence (PN) which corresponds to, and is synchronized with, the reference sequence transmitted by a base station on a pilot channel, and received by the mobile station over a propagation path, this operation being carried out regardless of the frequency deviation between the transmitter and the receiver. Various possible sequences are tested by calculating the quantities E[s(t).multidot.s*(t-.tau.)] and E[s(t).multidot.s*(t)], where E[.multidot.] designates the mean value calculated over a predetermined integration time, .tau. designates a predetermined delay, and s(t)=r(t).multidot.c(t) designates the product of the received base band signal r(t) and the value (c(t)) of the tested sequence, and by calculating the ratio .vertline.E[s(t).multidot.s*(t-.tau.)][.vertline./Es(t).multidot.s*(t)]. The sequence under test is selected if the ratio exceeds a predetermined threshold.

REFERENCES:
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patent: 4567588 (1986-01-01), Jerrim
patent: 4601047 (1986-07-01), Horwitz et al.
patent: 5103459 (1992-04-01), Gilhousen et al.
patent: 5111478 (1992-05-01), McDonald
patent: 5309474 (1994-05-01), Gilhousen et al.

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