H - Electricity – 04 – L
Patent
H - Electricity
04
L
325/35
H04L 27/18 (2006.01) H04L 27/20 (2006.01)
Patent
CA 1116240
23-6-1978 -46- PHN. 8888. ABSTRACT: A system having a transmitter and a receiver for transmitting binary data signals of a given symbol rate, and angle-modulated carrier signal of a sub- stantially constant amplitude and a continuous phase being generated in the modulation stage of the transmitter, and the transmitted modulated signal being orthogonally, coherently demodulated in the receiver. The modulation stage of the transmitter is arranged so that the phase of the modulated signal changes in each symbol interval by an amount from the sequence -?/2, 0?/4, 0, ?/4, ?/2 (rad.), which amount is determined for the relevant symbol interval by at least two successive data symbols, and the shape of the phase within the relevant symbol interval is determined by a filtered version of at least these two successive data symbols. These measures result in a system which, without sacrificing the remaining desired communication properties of FFSK-systems, utilizes the available fre- quency spectrum in a more efficient manner than FFSK- systems, because the modulated signal has both a narrower spectral main lobe and, for frequencies outside this spectral main lobe, considerably less power than the FFSK-signal. Consequently this system is very well suited for efficient data transmission over radio links.
310876
de Jager Frank
Dekker Cornelis B.
Muilwijk Dirk
N.v. Philips Gloeilampenfabrieken
Van Steinburg C.e.
LandOfFree
System for data transmission by means of an angle-modulated... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with System for data transmission by means of an angle-modulated..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and System for data transmission by means of an angle-modulated... will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-187196