Pulse or digital communications – Pulse code modulation
Patent
1993-07-09
1995-11-28
Chin, Stephen
Pulse or digital communications
Pulse code modulation
375219, H04B 1404
Patent
active
054715067
ABSTRACT:
The present invention relates to telecommunication technology, and more particularly, to a method and apparatus for pulse communication wherein rectangular pulse is replaced by cosine pulse. According to the present invention, cosine pulse analog modulation signal or cosine pulse code modulation signal may be transmitted in communication channel. Inside the enclosure of two communication apparatus designed according to the above method, there is provided circuits for converting rectangular pulse into cosine pulse by electronic switch. The present invention has the advantages of narrow occupation bandwidth, high output power, long transmission distance, and no intersymbol interference, etc. S/N ratio and crosstalk are improved greatly. In addition, when the conventional transmitter is switched to work under cosine pulse transmission, receiver can work without any amendment and communication quality is improved too. So, the present cosine pulse communication method is compatitiable with the conventional rectangular pulse communication.
REFERENCES:
patent: 3761622 (1973-09-01), Stucklen
patent: 3962549 (1976-06-01), Zuk
patent: 4302757 (1981-11-01), Still
patent: 5136264 (1992-08-01), Nardozza
patent: 5227740 (1993-07-01), Steinhagen et al.
Chen Chunhui
Chen Cuiwei
Chen Kejiong
Chin Stephen
He Shuzhen
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