Yang, Junwen;
Li, Ang;
Liao, Xuewen;
Masouros, Christos;
Swindlehurst, A Lee;
(2024)
Block-Level MU-MISO Interference Exploitation Precoding: Optimal Structure and Explicit Duality.
IEEE Internet of Things Journal
, 11
(21)
pp. 35519-35535.
10.1109/JIOT.2024.3438569.
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Abstract
This paper investigates block-level interference exploitation (IE) precoding for multi-user multiple-input single-output (MU-MISO) downlink systems. To overcome the need for symbol-level IE precoding to frequently update the precoding matrix, we propose to jointly optimize all the precoders or transmit signals within a transmission block. The resultant precoders only need to be updated once per block, and while not necessarily constant over all the symbol slots, we refer to the technique as block-level slot-variant IE precoding. Through a careful examination of the optimal structure and the explicit duality inherent in block-level power minimization (PM) and signal-to-interference-plus-noise ratio (SINR) balancing (SB) problems, we discover that the joint optimization can be decomposed into subproblems with smaller variable sizes. As a step further, we propose block-level slot-invariant IE precoding by adding a structural constraint on the slot-variant IE precoding to maintain a constant precoder throughout the block. A novel linear precoder for IE is further presented, and we prove that the proposed slot-variant and slot-invariant IE precoding share an identical solution when the number of symbol slots does not exceed the number of users. Numerical simulations demonstrate that the proposed precoders achieve a significant complexity reduction compared against benchmark schemes, without sacrificing performance.
| Type: | Article |
|---|---|
| Title: | Block-Level MU-MISO Interference Exploitation Precoding: Optimal Structure and Explicit Duality |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1109/JIOT.2024.3438569 |
| Publisher version: | https://doi.org/10.1109/JIOT.2024.3438569 |
| Language: | English |
| Additional information: | This version is the author-accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Precoding, Interference, Symbols, Signal to noise ratio, Vectors, Optimization, Minimization |
| 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/10195960 |
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