An efficient single-carrier symbol synchronization method is proposed in this paper, which can work under a very low oversampling rate. This method is based on the frequency alias-ing squared timing recovery assisted by pilot symbols and time domain filter. With frequency alias-ing squared timing recovery with pilots, it is accessible to estimate timing error under oversam-pling rate less than 2. The time domain filter simultaneously performs matched-filtering and arbi-trary interpolation. Because of pilot assisting, timing error estimation can be free from alias and self noise, so our method has good performance. Compared with traditional time-domain methods requiring oversampling rate above 2, this method can be adapted to any rational oversampling rate including less than 2. Moreover, compared with symbol synchronization in frequency domain which can operate under low oversampling rate, our method saves the complicated operation of conver-sion between time domain and frequency domain. By low oversampling rate and resource saving fil-ter, this method is suitable for ultra-high-speed communication systems under resource-restricted hardware. The paper carries on the simulation and realization under 64QAM system. The simula-tion result shows that the loss is very low (less than 0.5 dB), and the real-time implementation on field programmable gate array (FPGA) also works fine.

Shili Wang;Ruihao Song;Dongfang Hu

School of Information and Electronics, Beijing Institute of Technology, Beijing 100081, China

北京理工大学学报（英文版）

[1]Shili Wang;Ruihao Song;Dongfang Hu-.Symbol Synchronization of Single-Carrier Signal with Ultra-Low Oversampling Rate Based on Polyphase Filter)[J].北京理工大学学报（英文版）,2022(05):492-504

Polyphase,oversam

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