An Amplitude Limiting CDM by Using Majority Logic (Special Section on Analog Circuit Techniques for System-on-Chip Integration)

概要

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This study proposes an amplitude limiting type spread spectrum communication to be applied to extremely low power radio wave communication and evaluates capability of the code division multiplex. First, changes in output from the correlation device, maximum power, and in allowable noise power are compared by computer simulation for the case where the number of multiplex channels is increased. Second, possible relationship between noise intensity and error rate is measured by actual loading experiments using a device developed for trial purpose. Third, majority decision logic is proposed for the said device to realize amplitude limiting type code division multiplex easily. When the amplitude is limited, the maximum power can be controlled at about 2 dB, and channels with more than half of the number of spread sign can be used. It is revealed that, in the spread spectrum, alteration of the number of multiplex channels is made easy by application of this method.
社団法人電子情報通信学会の論文
1997-02-25