Generalized frequency division multiplexing method with multiple-input multiple-output and flexible index modulation

A generalized frequency division multiplexing method with multiple-input multiple-output and flexible index modulation, the method comprising the steps of:

• taking a generalized frequency division multiplexing (MIMO-GFDM) system with multiple-input multiple-output composed of T number of transmitters and R numbers of receiver antennas;
• then separating P number data bits to p-bit L groups each by a primary bit splitter,
• mapping p-bit in each group with a u-element subcarrier group;
• taking the pT=ENSM(1+ENQM)log2(T) bit part of p bits of data in the Tx Antenna selector block, wherein ENSM is a control signal used to control a spatial modulation (SM) mode in an on-off fashion, ENQM is a control signal used to control a quadrature spatial modulation (QM) mode in the on-off fashion, and ENSM and ENQM are equal to 0 or 1;
• defining the p bits as a binary number;
• determining a transmission antenna for the u-element subcarrier group at a transmitter antenna numbered by a decimal number corresponding to the binary number;
• the subcarrier index selector block taking pIM bits and choosing the pIM bits as subcarrier indexes indicated by IlA={il,1A, il,2A, . . . , il,vA} in a primary subcarrier group according to a selection rule, wherein the pIM bits are index modulation (IM) bits, and A refers to a primary IM subgroup;
• then choosing remaining bits of p-bit data and QAM symbols to be assigned to the subcarriers;
• generating a generalized frequency division multiplexing (GFDM) symbol by bringing u-element L number of groups together;
• then, making a NCP-length cyclic prefix addition in order to convert a linear convolutional effect of the channel to a cyclic convolution;
• performing a cyclic prefix removal at the receiver;
• operating a near optimum decision rule with a maximum likelihood-successive interference cancellation (ML-SIC) technique in order to determine data transmitted at the receiver with maximum precision;
• then, obtaining a p-bit array for each space-frequency index modulation block at a secondary bit combiner;
• finally, obtaining the P bit input information bits by combining the p bit arrays with a primary bit combiner.