Spread spectrum communication system

Details Spread spectrum communication system Spread spectrum communication system

1997-09-08

2000-08-15

Pham, Chi H.

Pulse or digital communications

Spread spectrum

Direct sequence

375130, H04B 1500

Patent

active

061047465

ABSTRACT:
A combined channel or a composite channel is to be transformed into a plurality of element channels. The composite channel may be either shared by a plurality of communication stations on time division multiplex basis, or used by a single communication station. In a transmit side, a serial data information which is called a composite channel is transformed to parallel form associated with a plurality of element channels, each of which is spread by using a single common PN code. Each spread element channels are frequency converted to radio frequency so that the center carrier frequency is offset from that of adjacent element channel by an integer multiple of information transmission rate of each element channel, and frequency band occupied by spread element channels overlap with one another. Each element channels thus spread and frequency converted are combined on frequency axis, and transmitted to a receive side. Thus, all the element channels are synchronized with one another because of the use of a single common PN code, and receive level of signal of each element channel is uniform, irrespective of a number of communication stations, and therefore, high quality communication with no interference is obtained in a relatively narrow frequency band.

REFERENCES:
patent: 5319672 (1994-06-01), Sumiya et al.
patent: 5343495 (1994-08-01), Lovell et al.
patent: 5345245 (1994-09-01), Ishikawa et al.
patent: 5479442 (1995-12-01), Yamamoto
patent: 5499267 (1996-03-01), Ohe et al.
patent: 5610939 (1997-03-01), Takahashi et al.
patent: 5625639 (1997-04-01), Tomita et al.
patent: 5737362 (1998-04-01), Hyun et al.
patent: 5793794 (1998-08-01), Kato et al.
patent: 5796774 (1998-08-01), Kato et al.
"Performance of Orthogonal Multi-Carrier CDMA in a Multipath Fading Channel", Sourour et al, IEEE Proceedings of the Global Telecommunications Conference, vol. 1, Nov. 28, 1994, pp. 390-394.
"Multicarrier Transmission Technique in Cellular Mobile Communications Systems", Reiners et al, IEEE Proceedings of the Vehicular Technology Conference, vol. 1, Conf. 44, Jun. 8, 1994, pp. 1645-1649.
"Computer Networks", Tanenbaum, pp. 84-86, and pp. 127-130.
Multitone Spread Spectrum Multiple Access Communications System in a Multipath Rician Fading Channel:, Vandendorpe, IEEE Transactions on Vehicular Technology, vol. 44, No. 2, May 1995, pp. 327-337.

Affiliated with

Also associated with

Rating

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

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2015321