Spectrum spread transmission method and apparatus

Details Spectrum spread transmission method and apparatus Spectrum spread transmission method and apparatus

1997-03-18

2000-03-14

Pham, Chi H.

Pulse or digital communications

Repeaters

Testing

H04B 1500, H04K 100, H04L 2730

Patent

active

06038249&

ABSTRACT:
Transmission method and apparatus allow two channel simultaneous transmission of information codes having a transmission rate of 1.5 Mbps necessary for the transmission of motion pictures or semi-motion pictures through a 2.4 GHz small power communication band (ISM band). Carrier frequencies f.sub.fa and f.sub.hb of the two channels are set to different values from each other, QPSK modulation is demodulated in a receiver and then inverse-spread of the spectrum spread is conducted, and a low pass filter having a root roll-off characteristic is inserted to a succeeding stage of a spectrum spread circuit of a transmitter and a preceding stage of the spectrum inverse-spread circuit of the receiver.

REFERENCES:
patent: 4918706 (1990-04-01), Phillips et al.
patent: 4984247 (1991-01-01), Kaufmann et al.
patent: 5280537 (1994-01-01), Sugiyama et al.
patent: 5313457 (1994-05-01), Hostetter et al.
patent: 5353302 (1994-10-01), Bi
patent: 5450395 (1995-09-01), Hostetter et al.
patent: 5577025 (1996-11-01), Skinner et al.
patent: 5720039 (1998-02-01), Lieberman

Affiliated with

Also associated with

Rating

Spectrum spread transmission method and apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.

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

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-176208