Fast Fluid Antenna Multiple Access Enabling Massive Connectivity

Massive connectivity over wireless channels relies on aggressive spectrum sharing techniques. Conventionally, this may be achieved by sophisticated signal processing and optimization of applying multiple antennas and/or complex multiuser decoding at each user terminal (UT). Different from previous methods, letter proposes a radical approach for massive connectivity, which employs fluid antenna UT to exploit the interference null, created naturally multipath propagation randomness UT’s data, symbol-by-symbol basis access. The proposed fast access ( $f$ -FAMA) system adopts large, distributed array base station (BS) transmit BS lets overcome its own using antenna. Our main contribution is technique that estimates best port reception every symbol instance. needs only cross-correlation calculations single-user requires no precoding BS. Simulation results demonstrate with 16 supporting co-channel users, multiplexing gain 14.87 even when channel has strong line-of-sight (LoS) few. can also rise 24.36 if 30-antenna serving 30 users.