Transceiver Design for Multi-Numerology Systems: Downlink Spatial Multiplexing

This paper presents a novel transceiver design for multi-numerology systems, enabling efficient spatial multiplexing in downlink communication. Multi-antenna and multi-numerology technologies are vital for modern wireless networks, yet a unified transceiver design that seamlessly integrates both has been absent from the literature. Our proposed design fills this gap, incorporating a tailored precoding scheme. OFDM symbols from different numerologies are grouped into a single encapsulation OFDM symbol for processing. This design facilitates the complete elimination of all interference types through linear precoding. We thoroughly investigate precoding design for both shortening and multiplexing, proposing a new approach that combines waterfilling with filtering of the designed channel gains. Finally, simulation results demonstrate the effectiveness and performance of the proposed transceiver in practical scenarios.