Mapping and Permutation Set Design for Spatial Permutation Modulation (SPM) Spatial permutation modulation (SPM) has been proposed and demonstrated as an efficiency multipleinput multipleoutput (MIMO) technique which generalizes spatial modulation (SM) by exploiting the time coordinate for further transmit diversity gain. In particular, SPM activates the transmit antennas at successive time instants by the permutation vector which brings the information bits. In this work, we elaborate on the design of the permutation set of SPM and the mapping between the permutation vector and the information bits. A MIMO system with 6 transmit antennas and 16 permutation vectors in the adopted set is applied as an example for these two design issues. Numerical results demonstrate that, by using our mapping rules and designed permutation sets, the error rate of the SPM system is greatly improved.

MultiMode Generalized SpaceTime Index Modulation: A HighRate Index Modulation Scheme for MIMOISI Channels In this paper, a new index modulation technique, referred to as the multimode generalized spacetime index modulation (MMGSTIM) is presented. MMGSTIM is a highrate index modulation scheme for multiantenna intersymbol interference (MIMOISI) channels. The proposed MMGSTIM is a single carrier scheme with zero padding (ZP). MMGSTIM performs xe2x80x98modeindexingxe2x80x99 to efficiently increase the spectral efficiency. In a given MMGSTIM frame, disjoint subsets of spacetime slots are used to transmit modulation symbols from disjoint modulation alphabets (referred to as the modes). The choice of which spacetime slots are used for transmission of a particular mode in an MMGSTIM matrix conveys information bits. Thus, MMGSTIM is a generalization of the wellknown index modulation schemes such as spatial modulation (SM), generalized spatial modulation (GSM), and spacetime index modulation. Here, an analytical characterization of the diversity order of the proposed MMGSTIM scheme and the conditions required to maximize the transmission rate of multimode index modulation schemes are derived. Through simulations, it is shown that the proposed MMGSTIM scheme can achieve better performance compared to other modulation schemes in MIMOISI channels.