High performance bit‐activation code index modulation method

With the increasing demand of applications for spread spectrum technique, especially data transmission rates and spectral efficiency, advantages traditional direct sequence (DSSS) system are limited. Therefore, multi-ary (M-ary) technology, parallel combinatory (PCSS) code index modulation (CIM) technology have been proposed. Although these three new technologies can improve rate, they all face problem large consumption pseudo-code resources. In order to solve resources, a bit-activation (BA-CIM) method is At transmitter, considering good correlation among multiple pseudo-codes, corresponding activation principle established, spreading activated by using status each bit according principle. Then, multicode superposition processing carried out data. receiver, obtained maximum peak-to-average ratio (MPAR) secondary (SPAR) judgement mechanisms decode multibit Compared with existing methods, proposed BA-CIM not only achieve better error rate performance but also use least Moreover, has best comprehensive improvement far superior other methods. This research provide technical support application efficient communication.