Interference management solutions for next-generation networks: (i) efficient spectral shaping of multiantenna-precoded communication waveforms for current and advanced multicarrier modulation formats such as orthogonal time-frequency-space (OTFS) to reduce adjacent channel interference; (ii) design of next-generation multiple-access (NGMA) schemes based on multiantenna signaling techniques for interference-resistant, massively populated dense networks; (iii) optimization of ultra-reliable low-latency communication (URLLC) methods based on short packet design for delay-sensitive applications.