SCMA-based implementation steps:
1. To achieve codebook resources to the physical frequency mapping matrix (matrix mapping) domain resource mapping;
The complex domain constellation (complex domain constellation design) 2. for binary bitstream to codebook mapping;
- (B1, b2) ----- complex constellation mapping field (two-dimensional) ------> (x1, x2, x3, x4) ------ one codeword to two physical resource blocks mapping (each resource block to achieve a transmission of multiplexed signals) -------> f1: x1 + jx2 f2: x3 + jx4
During the implementation of the above-described transmission of one codeword on the two physical resource blocks.
- In the normal OFDM, one (b1, b2) ----- constellation mapping ------> (x1, x2) ------ mapped to a physical resource block (each resource block to achieve a transmission complex signal) -------> f1: x1 + jx2
