An amplitude limiting type code division multiplex system for extremely low power transmitters

This study proposes amplitude limiting type spread spectrum communication to be applied to extremely low power radio wave communication and evaluates the capability of code division multiplexing. 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 multiplexed channels is increased. Second, a possible relationship between noise intensity and error rate is measured by actual loading experiments using a device developed for trial purposes. Third, majority decision logic is proposed for the said device to realize amplitude limiting type code division multiplexing easily. It is revealed that, in the spread spectrum, alteration of the number of multiplexed channels is made easy by application of this method