Label Design-based ELM Network for Timing Synchronization in OFDM Systems with Nonlinear Distortion

2021-07-28 · Chaojin Qing, Shuhai Tang, Chuangui Rao, Qing Ye, Jiafan Wang, Chuan Huang

Due to the nonlinear distortion in Orthogonal frequency division multiplexing (OFDM) systems, the timing synchronization (TS) performance is inevitably degraded at the receiver. To relieve this issue, an extreme learning machine (ELM)-based network with a novel learning label is proposed to the TS of OFDM system in our work and increases the possibility of symbol timing offset (STO) estimation residing in inter-symbol interference (ISI)-free region. Especially, by exploiting the prior information of the ISI-free region, two types of learning labels are developed to facilitate the ELM-based TS network. With designed learning labels, a timing-processing by classic TS scheme is first executed to capture the coarse timing metric (TM) and then followed by an ELM network to refine the TM. According to experiments and analysis, our scheme shows its effectiveness in the improvement of TS performance and reveals its generalization performance in different training and testing channel scenarios.

📄 PDF Abstract BibTeX arXiv:2107.13177

Code (0)

등록된 구현이 없습니다.

Methods 이 논문이 사용한 방법론

TS Spatio-temporal features extraction that measure the stabilty. The proposed method is based on a compression algorithm named Run Length Encoding. The workflow of the method is…

Metric Learning-Based Timing Synchronization by Using Lightweight Neural Network

2023-07-01 · Chaojin Qing, Na Yang, Shuhai Tang, Chuangui Rao 외

Timing synchronization (TS) is one of the key tasks in orthogonal frequency division multiplexing (OFDM) systems. However, multi-path uncertainty corrupts the TS correctness, making OFDM systems suffer from a severe inte…

Metric Learning

Improved Label Design for Timing Synchronization in OFDM Systems against Multi-path Uncertainty

2023-07-19 · Chaojin Qing, Shuhai Tang, Na Yang, Chuangui Rao 외

Timing synchronization (TS) is vital for orthogonal frequency division multiplexing (OFDM) systems, which makes the discrete Fourier transform (DFT) window start at the inter-symbol-interference (ISI)-free region. Howeve…

ELM-based Timing Synchronization for OFDM Systems by Exploiting Computer-aided Training Strategy

2023-06-30 · Mintao Zhang, Shuhai Tang, Chaojin Qing, Na Yang 외

Due to the implementation bottleneck of training data collection in realistic wireless communications systems, supervised learning-based timing synchronization (TS) is challenged by the incompleteness of training data. T…

CNN-based Timing Synchronization for OFDM Systems Assisted by Initial Path Acquisition in Frequency Selective Fading Channel

2022-12-06 · Chaojin Qing, Na Yang, Shuhai Tang, Chuangui Rao 외

Multi-path fading seriously affects the accuracy of timing synchronization (TS) in orthogonal frequency division multiplexing (OFDM) systems. To tackle this issue, we propose a convolutional neural network (CNN)-based TS…

compressed sensing

Lightweight 1-D CNN-based Timing Synchronization for OFDM Systems with CIR Uncertainty

2022-09-14 · Chaojin Qing, Shuhai Tang, Xi Cai, Jiafan Wang

In this letter, a lightweight one-dimensional convolutional neural network (1-D CNN)-based timing synchronization (TS) method is proposed to reduce the computational complexity and processing delay and hold the timing ac…