The invention discloses a flexibly configured time
delay Doppler domain OTFS index modulation method,
system and program product. The
system comprises a transmitting end and a receiving end, wherein the transmitting end comprises an IQ mapping module capable of dynamically configuring grid activation ratio and
modulation order. At a transmitting end, binary sequences of in-phase components and quadrature components are mapped respectively, the in-phase components and the quadrature components of sub-blocks are constructed, and sub-
block level dynamic grid activation ratio and
modulation order configuration are obtained. At a receiving end, an improved
message passing detection
algorithm is adopted to obtain an activated time
delay Doppler domain grid position and a modulation symbol. According to the invention, through dynamic
subcarrier activation and
modulation order configuration, changing channel conditions and transmission requirements can be adapted; an information bit sequence is reasonably mapped into sub-blocks of in-phase and orthogonal components, so that effective
information transmission under different configurations is ensured, and meanwhile, relatively low mapping complexity is maintained; the detection complexity is reduced by an improved messaging
detector while maintaining good BER performance.