DocumentCode
745349
Title
New Technique for Generating and Detecting Multilevel Signal Formats
Author
Miyauchi, Kazuhiro ; Seki, Seizo ; Ishio, Hideki
Author_Institution
Yokosuka Electrical Communication Laboratory, Nippon Telegraph and Telephone Public Corp., Yokosuka, Kanagawa, Japan
Volume
24
Issue
2
fYear
1976
fDate
2/1/1976 12:00:00 AM
Firstpage
263
Lastpage
267
Abstract
A new modem circuit technique is proposed for multilevel signal transmission to utilize frequency bandwidth efficiently in high-speed digital carrier transmission systems. With this technique a multilevel amplitude and phase-keying (APK) signal is generated as the sum of the outputs of two multiphase modulators and is detected by tandem phase demodulators. This "superposed modem has a simple circuit configuration. It is constructed from phase-shift-keying (PSK) modems. It appears advantageous for realizing high-baud-rate multilevel transmission of severalhundred Megabauds (MBd). Experimental results show the feasibility of a 16-level modem with performance degradation of only about 1 dB from the theoretical predictions.
Keywords
APK communication; Amplitude modulation; Bandwidth; Circuits; Frequency; Modems; Phase detection; Phase modulation; Phase shift keying; Signal detection; Signal generators;
fLanguage
English
Journal_Title
Communications, IEEE Transactions on
Publisher
ieee
ISSN
0090-6778
Type
jour
DOI
10.1109/TCOM.1976.1093267
Filename
1093267
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