Multivalued FSK modulation system

Details Multivalued FSK modulation system Multivalued FSK modulation system

2007-08-28

2007-08-28

Ghayour, Mohammed (Department: 2611)

Pulse or digital communications

Transmitters

Angle modulation

C375S272000, C375S268000, C375S334000, C446S458000, C340S870030

Reexamination Certificate

active

10427068

ABSTRACT:
A multivalued FSK modulation system is provided in which when data to be transmitted is multivalued and transmitted/received, the detection level is different every symbol. When a two-valued signal is transmitted as one symbol, data (11), (01), (00) and (10) are previously set to be, for example, a shift of −6, a shift of +6, a shift of +2, and a shift of −2, respectively. When data to be input next is (00), mapping is performed so as to provide a sign weight of +2 from the sign weight at the position of current data. When the data to be input next is (10), mapping is performed so as to provide a sign weight of −2 from the position of the current sign weight. Thus, even if data of the same level is input, signals can be always detected in different levels, so that the sign detection point is not specified erroneously.

REFERENCES:
patent: 3699445 (1972-10-01), Kinsel
patent: 5412687 (1995-05-01), Sutton et al.
patent: 5960040 (1999-09-01), Cai et al.

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