查看文章

We proposed to use the non-orthogonal multiple access (NOMA) scheme in 60-GHz-millimeter-wave radio-over-fiber systems, exploiting the power domain of signals to enable multiuser access, and improve the performance with users under different channel conditions. A DSP-based successive interference cancellation scheme is implemented in the receiver to remove the interference from other users. By this NOMA scheme, the system optimizes the performance of all users as a whole group and dynamically allocates the power resources between different users, such that the reception quality and reliability of the user group is significantly improved compared with current orthogonal frequency-division multiple access. To overcome the user number and security issue raised from NOMA, both orthogonal and NOMA are applied. A nonlinear conjugate gradient method is proposed in the power allocation updating …