Orthogonal spread spectrum system

Details Orthogonal spread spectrum system Orthogonal spread spectrum system

1998-02-02

2000-08-22

Pham, Chi H.

Multiplex communications

Communication over free space

Combining or distributing information via code word channels...

370335, 370515, H04B 7216, H04J 306

Patent

active

061083275

ABSTRACT:
A system for maintaining orthogonality among a plurality of spread-spectrum signals arriving at a base station from a plurality of remote units. Each spread-spectrum signal of the plurality of spread-spectrum signals from each remote unit of the plurality of remote units is transmitted as a packet having a header followed by data. A base station sends a plurality of adjustment signals over a communications channel to the plurality of remote units, respectively. At each remote unit, a circuit selects, from the plurality of adjustment signals, a received-adjustment signal designated for each remote unit. A chip-sequence generator, located at each remote unit, generates a chip-sequence signal assigned to a respective remote unit and, responsive to the adjustment signal, adjusts timing of a chip-sequence signal generated by the chip-sequence generator. A remote spread-spectrum spreader processes, using the chip-sequence signal generated by the chip-sequence generator, a header-symbol signal and a data-sequence signal as an RU-spread-spectrum signal. An RU-transmitter section, time synchronized responsive to the adjustment signal, sends the RU-spread-spectrum signal over the communications channel to the base station. A base-station despreader despreads the RU-spread-spectrum signal as a header and data. A comparator compares the header with a timing signal to generate the adjustment signal.

REFERENCES:
patent: 4894842 (1990-01-01), Broekhoven et al.
patent: 5063560 (1991-11-01), Yerbury et al.
patent: 5081643 (1992-01-01), Schilling
patent: 5109390 (1992-04-01), Gilhousen et al.
patent: 5166951 (1992-11-01), Schilling
patent: 5247702 (1993-09-01), Su et al.
patent: 5267244 (1993-11-01), Messerschmitt et al.
patent: 5870393 (1999-02-01), Yano et al.
patent: 5943331 (1999-08-01), Lavean
patent: 5983113 (1999-11-01), Asanuma

Affiliated with

Also associated with

Rating

Orthogonal spread spectrum system does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Orthogonal spread spectrum system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Orthogonal spread spectrum system will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-589331