基于非二次幂极化码的三用户上行非正交多址接入系统OA

By constructing a joint encoding matrix based on a 3×3 polarizing kernel,the proposed scheme combines the independently encoded information sequences from each user into a single Non-Power-of-Two Polarization(NPOT)code whose length is three times that of an individual user's codeword.A NPOT-Aided Belief Propagation(NPOT-BP)decoding algorithm for three-user uplink Non-Orthogonal Multiple Access(NOMA)system is proposed.Compared with the conventional Successive Interference Cancellation-Belief Propagation(SIC-BP)decoder,the NPOT-BP approach enhances channel polarization through code length extension,thereby enabling reliable joint recovery of all users'information.Simulation results demonstrate that,compared with the SIC-BP scheme,the proposed NPOT-BP scheme achieves a Bit Error Rtae(BER)performance gain of over 0.7 dB.Furthermore,the proposed scheme enables reliable joint recovery of multi-user information using only a single decoder,thereby effectively reducing the system computational overhead.