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To deal with the problem that CIM should consume a lot of pseudo noise (PN) code resources when it increased the information transmission rate by increasing the number of mapping bits. This paper proposed a novel generalized code index modulation (GCIM). It divided the information bits of the transmitter into mapped bits and modulation bits and mapping modulation bits and mapped bits into modulation symbol and the indexes of the PN code groups respectively. The in-phase part and the orthogonal part of the modulation symbol spread spectrum by selecting activate PN code group respectively. What’s more, by increasing the number of the activate PN code of per transmission slot, which could increase the number of mapped bits and improved the spectral efficiency and energy efficiency of the system. The simulation results show that it is not better than CIM about 2 dB in the additive white Gaussian noise channel and about 1 dB in the Rayleigh fading channel at the same spectral efficiency. Nevertheless, compared with CIM, GCIM consumes significantly less PN code resources. [ABSTRACT FROM AUTHOR]

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