Super multi-carrier trellis coded 256 QAM digital microwave radio

Ohtsuka, Hiroyuki; Saito, Yoichi; Komaki, Shozo

doi:10.1109/glocom.1988.25844

Cited by 2 publications

(1 citation statement)

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“…Considering this situation, an Outage-fie DMR called "Super Multi-Carrier (SMC) system" is now under development [3] . It aims to reduce overall outage probability by 1/10 1/100 compared to existing high-capacity DMR systems using 16/256QAM.…”

Section: Introductionmentioning

confidence: 99%

Advanced techniques for super multi-carrier digital microwave radio with trellis-coded 256 QAM modulation

Nakamura

Ohtsuka

Aikawa

et al.

IEEE Global Telecommunications Conference, 1989, and Exhibition. 'Communications Technology for the 1990s and Beyond

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The latest techniques for realization of an outage-free Digital Microwave Radio (DMR) are presented. Three major techniques, Trellis-Coded 256QAM modulation, Super Multi-Carrier (SMC) Transmission and Microwave Signal Processing (MSP) are described. BER and Signature characteristics of Trellis-Coded 256QAM system is simulated. The result indicates its validity as a fading countermeasure. Viterbi-decoder LSI and effect of phase error on TCM modem is also presented. The experiment using 4,8,40-carrier 256QAM modem shows an overall outage improvement factor of nearly 500 times due to 40-carrier system. Lastly, Microwave Signal Processing (MSP) technique, which means DSP including IF-stage (carrier) signals for DMR systems, is presented. An all digital 256QAM modulator is constructed and shows superior performance with no adjustment.These studies have prospects for an outage free DMR system in the near future.

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Section: Introductionmentioning

confidence: 99%