Structured OFDM Modulation for XL-MIMO System with Dual-Wideband Effects
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影响因子：8.9
所属单位：School of Computer Science and Information Engineering, Hefei University of Technology
发表刊物：IEEE Transactions on Wireless Communications
项目来源：the National Natural Science Foundation of China under Grant 62371180, Grant 62471173, Grant 62225
关键字：Structured OFDM, dual-wideband effects, near field, dynamic metasurface array
摘要：Extremely large-scale multiple-input multiple output (XL-MIMO) wideband systems may exhibit the severe delay spread, due to its spatial- and frequency-wideband (dual wideband) effects. The typical orthogonal frequency division multiplexing (OFDM) technology have to insert a larger number of cyclic prefix (CP) to overcome the inter-symbol interference (ISI) induced by delay spread. The additional CP overhead will counteract the improvement of spectral efficiency by the large antenna array. To address the issue, this paper proposes a structured OFDM (SOFDM) modulation approach to reduce the CP overhead for wideband XL-MIMO systems with dual-wideband effects. As the ability to perform SOFDM is affected by the antenna architecture, we study the modulation technique considering different antenna structures, including fully-digital, phase shifter-based hybrid array, and dynamic metasurface antenna (DMA) architectures. Specifically, we first provide a mathematical model to represent a near-field channel with dual wideband effects. Based on the channel model, we develop the SOFDM modulation and then propose a joint spatial precoding and frequency domain equalization scheme to maximize the system spectral efficiency, where the solutions of precoding/combining and equalization matrices are derived for the three types of antenna array architectures. Numerical simulations indicate that the proposed scheme can effectively deal with the dual-wideband effects and significantly improve the spectral efficiency with low CP overhead.
合写作者：Lizheng Xu,Haiyang Zhang,Caihong Kai,Chunguo Li,Yongming Huang
第一作者：Wei Huang
论文类型：期刊论文
学科门类：工学
文献类型：J
卷号：24
期号：2
页面范围：1510-1525
ISSN号：1558 - 2248
是否译文：否
发表时间：2024-12-11
收录刊物：SCI、EI