20G-400M Digital Radio-Relay System

Kohiyama, Kenji; Yamamoto, H.; Nakamura, Yasuhisa

doi:10.1109/mwsym.1975.1123337

Cited by 3 publications

(3 citation statements)

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“…The effectiveness of the scrambling in the case of 4-phase PSK modulation has been confirmed in the field trials of W-40G gnd 20G-400M systems [ 11, [2].…”

Section: Resultsmentioning

confidence: 92%

“…The modem circuit was constructed from W-40G guided millimeter-wave transmission system modems [ 51 . 2 In this experiment, carrier frequency and clock frequency were chosen as 1700 MHz and 100 MHz, respectively. Clock frequency, however, can be increased t o 400 MHz (the W-40Gsystem baud rate).…”

Section: B Demodulation Methodsmentioning

confidence: 99%

“…The integration part becomes ii f 2 ' W c ( f 1 df [8] [lo] V. R. Algazi, "Bounds on the spectra of angle-modulated waves," High-speed digital carrier transmission has been extensively used recently in various fields such as microwave radio systems, satellite communication systems, and quasi-millimeter-wave and millimeter-wave communication systems [ 1 1 , [ 2 ] . In these systems one requirement has been to increase economically the information transmission rare within a limited frequency bandwidth.…”

Section: Letmentioning

confidence: 99%

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New Technique for Generating and Detecting Multilevel Signal Formats

Miyauchi

Seki

Ishio

1976

IEEE Trans. Commun.

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If the power spectrum of the FDM-FM signal is even unimodal, which decreases monotonically for f > 0 , the error bound is lower by a factor of 4/9, or as 12 becomes large, the improvement of bound goes to 1 /e. If the convolutional frequency range f m is large enough, one can apply the Chernov bound, which is tighter than the Chebyshev-Bienayme bounds [ I O ] . REFERENCES R. G. Medhurst, E. M. Hicks, and W. Grossett, "Distortion in frequency division multiplex FM system due to an interfering carrier," Proc. Inst. Elec. Eng., vol. 105B, pp. 282-292, May 1958.R. G. Medhurst, "RF spectra and interfering carrier distortion in FM trunk radio systems with low modulation ratios," IRE Trans. KAZUHIRO MIYAUCHI, SEIZO SEKI, AND HIDEKI ISHIOAbstruct-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.

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“…The effectiveness of the scrambling in the case of 4-phase PSK modulation has been confirmed in the field trials of W-40G gnd 20G-400M systems [ 11, [2].…”

Section: Resultsmentioning

confidence: 92%

Section: B Demodulation Methodsmentioning

confidence: 99%

Section: Letmentioning

confidence: 99%

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