TY  - JOUR
VL  - 11
N2  - 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.
EP  - 35535
JF  - IEEE Internet of Things Journal
AV  - public
ID  - discovery10195960
SN  - 2327-4662
N1  - This version is the author-accepted manuscript. For information on re-use, please refer to the publisher?s terms and conditions.
TI  - Block-Level MU-MISO Interference Exploitation Precoding: Optimal Structure and Explicit Duality
KW  - Precoding
KW  -  Interference
KW  -  Symbols
KW  -  Signal to noise ratio
KW  - 
Vectors
KW  -  Optimization
KW  -  Minimization
SP  - 35519
UR  - https://doi.org/10.1109/JIOT.2024.3438569
Y1  - 2024/11//
A1  - Yang, Junwen
A1  - Li, Ang
A1  - Liao, Xuewen
A1  - Masouros, Christos
A1  - Swindlehurst, A Lee
PB  - Institute of Electrical and Electronics Engineers (IEEE)
IS  - 21
ER  -