Signal-design for bandwidth-efficient multiple access (BEMA) communication based on eigenvalue optimization

Bandwidth-efficient multiple access (BEMA) is a multiple-access technique that seeks to minimize the required bandwidth while guaranteeing a certain quality of service (QoS) for each user. Decision feedback receivers (DFR) are used at the base station that decode the users successively, thereby allowing the users to use single-user error-control codes. This paper proposes a transmitter waveform design for a DFR based on eigenvalue optimization. The methodology is applicable for bandwidth measures such as root-mean squared (RMS) and fractional out-of-band power (FOBP). Numerical results show that BMA can significantly outperform orthogonal- and identical waveform signaling schemes.