OTFS-Based Multi-Numerology Multiple Access With Heterogeneous User Profiles

초록

This letter introduces a framework leveraging orthogonal time frequency space (OTFS) based multiple access configurations with multi-numerology (OTFS-MNMA) to efficiently serve users with heterogeneous user profiles. The framework employs numerology superposition coding (NSC) and successive interference cancellation (SIC) to consider both inter-user and inter-numerology interference among users with different numerology and mobility. The key user pairing strategy involves allocating wider subcarrier spacing (SCS) to high mobility users and narrower SCS to low mobility users. An optimization problem is formulated to maximize the sum rate, subject to power allocation constraints and with interferences effect incorporated via the SINR definition. Simulations are conducted to evaluate sum rate and bit error rate across various numerological ratios between user pairing.

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