Wei, Guorui;
Li, Ang;
Masouros, Christos;
(2024)
Exploiting Power Amplifier Nonlinearities through Symbol-Level Interference Exploitation Precoding in the MU-MIMO Downlink.
IEEE Transactions on Wireless Communications
10.1109/twc.2024.3349772.
(In press).
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Abstract
In this paper, we study the interference exploitation precoding in the presence of distortion from nonlinear power amplifiers (PAs) in multi-user multiple-input single-output (MU-MISO) downlink communication systems. We consider the memoryless polynomial model of nonlinear PAs, which is incorporated into the symbol-level precoding (SLP) design to allow the PA nonlinearities in the constructive interference (CI) exploitation. The optimization problem that aims to enhance the signal-to-interference-plus-noise ratio (SINR) without investing additional transmit signal power is formulated for both PSK and QAM signaling. Since the original optimization problem is nonconvex, we first introduce auxiliary variables to transform the optimization problem and adopt the alternating optimization framework for the new optimization problem. For non-convex subproblems, additional auxiliary variables are introduced and several approximations are employed to transform the problem into a semidefinite programming (SDP) form, where the semidefinite relaxation (SDR) method is adopted to obtain feasible solutions. In order to reduce the computational cost of the iterative algorithm, we further propose a low-complexity algorithm for the original PA-aware SLP optimization problem. Numerical results verify the superiority of our proposed PA-aware SLP approach in the presence of nonlinear PAs in the MU-MISO downlink in terms of the error-rate performance over the state-of-the-art.
| Type: | Article |
|---|---|
| Title: | Exploiting Power Amplifier Nonlinearities through Symbol-Level Interference Exploitation Precoding in the MU-MIMO Downlink |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1109/twc.2024.3349772 |
| Publisher version: | http://dx.doi.org/10.1109/twc.2024.3349772 |
| 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, Optimization, Peak to average power ratio, Massive MIMO, Wireless communication, Downlink |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science 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/10186029 |
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