Method and system for generating and using synchronized and unsy

Details Method and system for generating and using synchronized and unsy Method and system for generating and using synchronized and unsy

1998-01-07

2000-12-05

Pham, Chi H.

Multiplex communications

Communication over free space

Combining or distributing information via code word channels...

370350, 370515, 375367, H04B 169, H04J 306

Patent

active

06157631&

ABSTRACT:
In a cellular communications system having synchronized base stations and unsynchronized base stations, wherein the synchronized base stations are synchronized to system time and have a common pilot PN sequence used for all synchronized pilot channels, a marker sequence is selected. The selected marker sequence is comprised of an M-chip portion of the common pilot PN sequence. Next, a coded portion of an unsynchronized pilot PN sequence is generated wherein the coded portion identifies a selected unsynchronized base station. The marker sequence and the coded portion of the unsynchronized pilot PN sequence are combined to form the unsynchronized pilot PN sequence that is different from the common pilot PN sequence. Thereafter, an unsynchronized pilot channel baseband signal of an unsynchronized base station is spread with the unsynchronized pilot PN sequence to produce the unsynchronized pilot channel.

REFERENCES:
patent: 5546421 (1996-08-01), Basile et al.
patent: 5703873 (1997-12-01), Ojanpera et al.
patent: 6018667 (2000-01-01), Ghosh et al.
K. Higuchi, M. Sawahashi, and F. Adachi, "Fast Cell Search Algorithm In DS-CDMA Mobile Radio Using Long Spreading Codes" Mar. 1, 1997, pp. 1430-1434.

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