Wong, KK;
(2024)
Transmitter CSI-Free RIS-Randomized CUMA for Extreme Massive Connectivity.
IEEE Open Journal of the Communications Society
10.1109/OJCOMS.2024.3488503.
(In press).
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Abstract
This paper proposes a transmitter channel state information (CSI)-free, massive connectivity scheme in the downlink that requires no optimization from the base station (BS) side. Inter-user interference is dealt with solely by the mobile users themselves, each equipped with a position-flexible fluid antenna system (FAS). Specifically, we adopt the compact ultra massive antenna (CUMA) receiver architecture at the FAS of each user, which protects the desired user's signal from interference without the need of the interferers' CSI. Different from previous work, we incorporate the return loss and isolation parameters into the channel model to properly reflect realistic mutual coupling countermeasures and deploy randomized reconfigurable intelligent surfaces (RISs) in the environment to restore rich scattering channel conditions. Our simulation results demonstrate that under these conditions at 26GHz, CUMA can accommodate 50 users per channel use to achieve a rate of 45bps/Hz, without power control and precoding at the BS and also no successive interference cancellation (SIC) at each user. The rate will be increased to 54bps/Hz if 100 users are served, revealing the possibility of massive connectivity without the CSI at the BS.
| Type: | Article |
|---|---|
| Title: | Transmitter CSI-Free RIS-Randomized CUMA for Extreme Massive Connectivity |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1109/OJCOMS.2024.3488503 |
| Publisher version: | https://doi.org/10.1109/OJCOMS.2024.3488503 |
| Language: | English |
| Additional information: | This work is licensed under a Creative Commons Attribution 4.0 License. For more information, see https://creativecommons.org/licenses/by/4.0/ |
| Keywords: | Antennas, NOMA, Signal to noise ratio, Massive MIMO, Receiving antennas, Interference cancellation, Gain, Radio transmitters, Transmitting antennas, Switches |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10200342 |
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