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A novel rate splitting space division multiple access (SDMA) scheme based ongrouped code index modulation (GrCIM) is proposed for the sixth generation (6G)downlink transmission. The proposed RSMA-GrCIM scheme transmits information tomultiple user equipments (UEs) through the space division multiple access(SDMA) technique, and exploits code index modulation for rate splitting. Sincethe CIM scheme conveys information bits via the index of the selected Walshcode and binary phase shift keying (BPSK) signal, our RSMA scheme transmits theprivate messages of each user through the indices, and the common messages viathe BPSK signal. Moreover, the Walsh code set is grouped into severalorthogonal subsets to eliminate the interference from other users. A maximumlikelihood (ML) detector is used to recovery the source bits, and amathematical analysis is provided for the upper bound bit error ratio (BER) ofeach user. Comparisons are also made between our proposed scheme and thetraditional SDMA scheme in spectrum utilization, number of available UEs, etc.Numerical results are given to verify the effectiveness of the proposedSDMA-GrCIM scheme.

6G Downlink Transmission via Rate Splitting Space Division Multiple Access Based on Grouped Code Index Modulation