Soft value extraction method and device applicable to OvXDM system, and OvXDM system

A soft value extraction device applicable to an overlapped X domain multiplexing (OvXDM) system, comprising a hardware processor and a memory, wherein the hardware processor is configured to execute the following program units stored in the memory:

• a first predictive value calculation unit, configured to perform a waveform encoding operation on all symbols in a hard value sequence obtained by decoding, to generate a predictive value of the symbol obtained after overlapped coding;
• a second predictive value calculation unit, configured to reverse the symbols in the hard value sequence one by one, and perform an overlapped coding operation on each reversed symbol and associated symbols before and after the symbol, to generate a predictive value of the reversed symbol;
• and
• a soft value calculation unit, configured to:
• for each symbol in the hard value sequence, calculate a soft value of the current symbol based on A×(+1−−1), wherein A is a coefficient associated with a channel type, +1=∥yrx−y+1∥2, and −1=∥yrx−y−1∥2, wherein
• if y+1 is a predictive value of the symbol obtained after overlapped coding and before reversing, y−1 is a predictive value of the symbol obtained after overlapped coding and reversing;
• or if y−1 is a predictive value of the symbol obtained after overlapped coding and before reversing, y+1 is a predictive value of the symbol obtained after overlapped coding and reversing;
• and yrx is a received signal sequence.

An overlapped X domain multiplexing (OvXDM) system, comprising a soft value extraction device, wherein the soft value extraction device comprises a hardware processor and a memory, wherein the hardware processor is configured to execute the following program units stored in the memory:

• a first predictive value calculation unit, configured to perform a waveform encoding operation on all symbols in a hard value sequence obtained by decoding, to generate a predictive value of the symbol obtained after overlapped coding;
• a second predictive value calculation unit, configured to reverse the symbols in the hard value sequence one by one, and perform an overlapped coding operation on each reversed symbol and associated symbols before and after the symbol, to generate a predictive value of the reversed symbol;
• and
• a soft value calculation unit, configured to:
• for each symbol in the hard value sequence, calculate a soft value of the current symbol based on A×(+1−−1), wherein A is a coefficient associated with a channel type, +1=∥yrx−y+1∥2, and −1=∥yrx−y−1∥2, wherein
• if y+1 is a predictive value of the symbol obtained after overlapped coding and before reversing, y−1 is a predictive value of the symbol obtained after overlapped coding and reversing;
• or if y−1 is a predictive value of the symbol obtained after overlapped coding and before reversing, y+1 is a predictive value of the symbol obtained after overlapped coding and reversing;
• and yrx is a received signal sequence;
• wherein the OvXDM system is an overlapped time division multiplexing (OvTDM) system, an overlapped frequency division multiplexing (OvFDM) system, an overlapped code division multiplexing (OvCDM) system, an overlapped space division multiplexing (OvSDM) system, or an overlapped hybrid division multiplexing (OvHDM) system.