NDLI: Performance of trellis coded 256 QAM super-multicarrier modem using VLSI's for SDH interface outage-free digital microwave radio

Content Provider	IEEE Xplore Digital Library
Author	Aikawa, S. Nakamura, Y. Takanashi, H.
Copyright Year	1972
Abstract	This paper describes the performance of an outage free SDH (synchronous digital hierarchy) interface 256 QAM modem. An outage free DMR (digital microwave radio) is achieved by a high coding gain trellis coded SPORT QAM and super multicarrier modem. A new frame format and its associated circuits connect the outage free modem to the SDH interface. The newly designed VLSI's are key devices for developing the modem. As an overall modem performance, BER (bit error rate) characteristics and equipment signatures are presented. A coding gain of 4.7dB (at a BER of 10/sup /spl minus/4/) is obtained using SPORT 256 QAM and Viterbi decoding. This coding gain is realized by trellis coding as well as by increasing of transmission rate. Roll-off factor is decreased to maintain the same frequency occupation and modulation level as ordinary SDH 256 QAM modem.<>
Starting Page	1415
Ending Page	1421
Page Count	7
File Size	1218459
File Format	PDF
ISSN	00906778
Volume Number	42
Issue Number	234
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1994-02-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Quadrature amplitude modulation Modems Synchronous digital hierarchy Bit error rate Microwave devices Circuits Very large scale integration Viterbi algorithm Decoding Frequency
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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