Digital communication system

Details Digital communication system Digital communication system

H - Electricity

04

L

325/35

H04L 27/18 (2006.01) H04L 27/20 (2006.01) H04L 27/233 (2006.01)

Patent

CA 1268521

ABSTRACT OF THE DISCLOSURE The present invention provides a digital communication system in which one time slot is divided into a first half section and a second half section and the carrier phase difference a between each neighboring first half sections is set to either (.pi., 0) with respect to a binary information symbol (1, 0) or (0, .pi./2, .pi., 3/2.pi.) with respect to a quaternary information symbol (11, 01, 00, 10). In addition, the phase difference ? between the first half and the second half of any time slot is a constant value ? 0 (for example, .pi. rad) irrespective of the symbol, or ? i determined with respect to a symbol (for example, + .pi./2 with respect to a symbol 1 or -.pi./2 with respect to a symbol 0). Therefore, an arbitrary complementary characteristic can be obtained when differentially demodulated in a multipath fading channel, irrespective of the amplitude characteristic of a demodulation signal. - 23 -

536723

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