Waveform Optimization for Non-orthogonal CP-FBMA System

Filter bank multiple access (FBMA) without subbands orthogonality has been proposed as a new waveform to better cater the requirements of future wireless communication systems and scenarios. In addition, the usage of cyclic prefix (CP) in FBMA (CP-FBMA) has been proved to have many advantages such as the ability to process complex signals, lower peak-to-average power ratio (PAPR) and bit error rate (BER). However, the non-orthogonality of the system has not been fully exploited for waveform design, which inspires us to propose a new manifold-based waveform optimization iteration algorithm on the full band for the non-orthogonal CP-FBMA system, where full band means that there is no restriction on frequency responses of the synthesis filter bank (SFB) to match channels more perfectly. Both general framework and detailed derivation processes of the proposed waveform optimization algorithm are presented in this paper. Numerical results show that the algorithm converges after only a few iterations and it can improve the sum rate of the system dramatically.