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Efficient Spatio-Temporal Predictive Learning for Massive MIMO CSI Prediction
CHENG Jiaming, CHEN Wei, LI Lun, AI Bo
ZTE Communications    2025, 23 (1): 3-10.   DOI: 10.12142/ZTECOM.202501002
Abstract95)   HTML207)    PDF (1023KB)(174)       Save

Accurate channel state information (CSI) is crucial for 6G wireless communication systems to accommodate the growing demands of mobile broadband services. In massive multiple-input multiple-output (MIMO) systems, traditional CSI feedback approaches face challenges such as performance degradation due to feedback delay and channel aging caused by user mobility. To address these issues, we propose a novel spatio-temporal predictive network (STPNet) that jointly integrates CSI feedback and prediction modules. STPNet employs stacked Inception modules to learn the spatial correlation and temporal evolution of CSI, which captures both the local and the global spatio-temporal features. In addition, the signal-to-noise ratio (SNR) adaptive module is designed to adapt flexibly to diverse feedback channel conditions. Simulation results demonstrate that STPNet outperforms existing channel prediction methods under various channel conditions.

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Real-Time 4-Mode MDM Transmission Using Commercial 400G OTN Transceivers and All-Fiber Mode Multiplexers
REN Fang, LI Yidan, YE Bing, LIU Jianguo, CHEN Weizhang
ZTE Communications    2024, 22 (1): 106-110.   DOI: 10.12142/ZTECOM.202401012
Abstract70)   HTML1)    PDF (1154KB)(231)       Save

Weakly-coupled mode division multiplexing (MDM) technique is considered a promising candidate to enhance the capacity of an optical transmission system, in which mode multiplexers/demultiplexers (MMUX/MDEMUX) with low insertion loss and modal crosstalk are the key components. In this paper, a low-modal-crosstalk 4-mode MMUX/MDEMUX for the weakly-coupled triple-ring-core few-mode fiber (TRC-FMF) is designed and fabricated with side-polishing processing. The measurement results show that a pair of MMUX/MDEMUX and 25 km weakly-coupled TRC-FMF MDM link achieve low modal crosstalk of lower than -17.5 dB and insertion loss of lower than 11.56 dB for all the four modes. Based on the TRC-FMF and all-fiber MMUX/MDEMUX, an experiment for 25 km real-time 4-mode 3-λ wavelength division multiplexing (WDM)-MDM transmission is conducted using commercial 400G optical transport network (OTN) transceivers. The experimental results prove weakly-coupled MDM techniques facilitate a smooth upgrade of the optical transmission system.

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Toward Low-Cost Flexible Intelligent OAM in Optical Fiber Communication Networks
YAN Baoluo, WU Qiong, SHI Hu, ZHAO Yan, JIA Yinqiu, FENG Zhenhua, CHEN Weizhang, ZHU Mo, ZHAO Zhiyong, FANG Yu, CHEN Yong
ZTE Communications    2022, 20 (3): 54-60.   DOI: 10.12142/ZTECOM.202203007
Abstract126)   HTML6)    PDF (3448KB)(186)       Save

Low-cost, flexible and intelligent optical performance monitoring and management is a key enabling technology for network quality guarantee, especially in the era of explosive growth of communication capacity and network scale. However, to the best of our knowledge, it is extremely challenging to implement real-time performance monitoring and operations, administration and maintenance (OAM) in a highly complex dynamic network. In this paper, we propose an innovative optical identification (OID) scheme that can realize both performance monitoring and some advanced OAM sub-functions. The basic concepts, applications, challenges and evolution directions of this OID tool are also discussed.

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