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자료유형
학술저널
저자정보
저널정보
대한전자공학회 텔레콤 텔레콤 제10권 제2호
발행연도
1994.12
수록면
30 - 57 (28page)

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Carrierless Amplitude Modulation/Phase Modulation(CAP) is a bandwidth-efficient two-dimensional passband line code that was originally derived from the closely related quadrature amplitude modulation (QAM) line code. CAP transceivers are particular]y well suited to all-digital implementations for applications where the bandwidth of the signal's spectrum is of the same order of magnitude as the center frequency of the spectrum. CAP has the same spectral characteristics and provides the same theoretical performance as QAM, but is generally less complex to implement digitally. The purpose of this paper is to provide an introduction to the design of digital CAP transceivers, with emphasis on the high-rate digital subscriber line(HDSL), asymmetric digital subscriber line(ADSL), high-speed local area network(LAN), and broadband interactive multimedia applications. We present experimental results of the CAP HDSL and ADSL transceivers. In order to get the full trellis coding gain without sacrificing any of the decision feedback equalizer(DFE) gain, we use Tom]inson precoding by which the feedback filter of the DFE is transposed into the transmitter HDSL CAP system. We have implemented an ADSL transceiver prototype using 64-CAP and 16-CAP line codes for the 1.544 Mb/s down-stream and 24.5 kb/s upstream channels, respectively. The perfomlance results of the ADSL CAP transceivers in the presence HDSL architecture.

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ABSTRACT

Ⅰ. INTRODUCTION

Ⅱ. CARRIERLESS AM/PM

Ⅲ. HIGH-RATE DIGITAL SUBSCRIBER LINE(HDSL)

Ⅳ. ADSL: VIDEO-ON-DEMAND OVER COPPER LOOP PLANT

Ⅴ. LOCAL AREA NETWORK(LAN): ATM-LAN, TPDDI-LAN

Ⅵ. VIDEO-ON-DEMAND IN THE FTTC NETWORK ARCHITECTURE

Ⅶ. SUMMARY

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