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We define y0,k and y0Hs as follows respectively£¬the received signal vector of V0 as the first formula, where Hdd is the channal gain vector expression as follows. Hdd is a block cyclic matrix in MN*NM dimensions, where each submatrix G0 is a M*M cyclic matrix. Due to the special structure of H, it can be block diagonalized by theKronecker product of N*N and M*M DFT matrices. Considering the ISI in the proposed NOMA-OTFS system, the inter-symbol interference needs to be further eliminated byequalization techniques. |