대한전자공학회논문지 (Journal of the Korean Institute of Telematics and Electronics)
- 제26권11호
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- Pages.1743-1751
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- 1989
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- 1016-135X(pISSN)
PRS 및 49-QPRS 채널의 Trellis-Coded 변조 기술
Trellis-Coded Modulation Techniques for PRS and 49-QPRS Channels
초록
In this paper, we consider trellis-coding techniques with the convolutional encoder R=k/(k+1) for improving the reliability of digital transimission over bandlimited noisy PRS and 49-QPRS channels. Employing the R=k/(k+1) convolutional code for the PRS channel results in over 3 dB of coding gain comparing with the baseline system. The trellis-coded 49-QPRS system can be realized by combining the 9-QPRS system with the R=1/2 convolutiona code, which can be improved by over 2dB coding gain comparing with the 9-QPRS system. In additin, we study a method of avoiding the occurance of unlimited runs of identical output to prevent operation of timing error.
키워드