Orthogonal frequency division multiplexing (OFDM) is widely adopted in modern wireless systems for high spectral efficiency, yet its high peak-to-average power ratio (PAPR) limits power amplifier efficiency. Mixed-numerology transmission, which enables flexible subcarrier spacing for diverse services, further aggravates the PAPR problem. Although PAPR-aware precoding has been investigated in single-numerology multi-user multiple-input multiple-output (MU-MIMO) OFDM systems, the PAPR suppression in mixed-numerology MU-MIMO OFDM systems has not been thoroughly addressed. In this letter, we propose a low-complexity precoding method to jointly suppress per-antenna PAPR, inter-numerology interference (INI), and multi-user interference (MUI) in mixed-numerology MU-MIMO OFDM systems. By decomposing the complex precoding design problem into low-dimensional subproblems, we develop an efficient algorithm with closed-form or semi-closed-form updates. Simulation results demonstrate that the proposed algorithm effectively reduces transmit power while satisfying per-antenna PAPR, INI, and MUI constraints, highlighting its application potential for MU-MIMO data-channel transmission with available channel state information (CSI).
In this paper, we study the optimization of subband precoder for an orthogonal frequency division multiplexing rate-splitting multiple access (OFDM-RSMA) system in a multi-user multiple-input single-output (MU-MISO) downlink scenario. In conventional OFDM-space division multiple access (SDMA) systems, each subband cons...
Jeonghyun Moon, Hyesang Cho, Bruno Clerckx et al.· IEEE Transactions on Wireles...· 0 citations
An inexact alternating direction method of multipliers (ADMM) algorithm with alternating time- and frequency-domain updates is developed that enables subcarrier-wise optimization in the frequency domain and closed-form primal and dual updates in the time domain.
The proposed iterative closed-form solution improves spectral efficiency by 70% compared to the half-duplex (HD) algorithm under low self-interference intensity, and outperforms the SLNR and SCAMP algorithms by 5% and 7%, respectively.
Numerical results coincide with the analysis and demonstrate significant improvements in terms of achievable rates and bit error rate compared to conventional MIMO-OFDM counterpart, making the proposed scheme a promising solution to 6G and beyond wireless networks.
Jie Yang, Wan-Chen Hu, Yi Song et al.· 0 citations
This article addresses the communication bottleneck issue in the intelligent upgrade of low-voltage distribution networks of China Southern Power Grid, focusing on the joint optimization of precoding matrices and inter-symbol interference cancellation techniques based on the Multiple-Input Multiple-Output (MIMO) archit...
Ying Liu, Xiao-Dong Pan, Ben-Hai Wei et al.· European Conference on Elect...· 0 citations
Pilot overhead is a bottleneck for improving spectral efficiency in multiple-input multiple-output orthogonal frequency division multiplexing (MIMO-OFDM) systems. To alleviate this issue, superimposed pilot (SIP)-aided transmissions have been widely studied. However, channel estimation under SIP remains challenging due...
De-Yu Lu, Yi-Yin Wang, Chen-Ye Wang et al.· IEEE Wireless Communications...· 0 citations
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