Novel training symbol design for transmitter IQ mismatch compensation in CO-OFDM system

2019 ◽  
Author(s):  
Xiurong Ma ◽  
Pengru Li ◽  
Haoyuan Zhang ◽  
Yunlong Shan ◽  
Meng Yang
Keyword(s):  
Ofdm System ◽  
Training Symbol

Training Symbol Assisted in-Band OSNR Monitoring Technique for PDM-CO-OFDM System

2017 ◽  
Vol 35 (9) ◽  
pp. 1551-1556 ◽  
Author(s):  
Qiong Wu ◽  
Liangjun Zhang ◽  
Xiang Li ◽  
Ming Luo ◽  
Zhenhua Feng ◽  
...  
Keyword(s):  
Ofdm System ◽  
Monitoring Technique ◽  
Training Symbol

scholarly journals A Novel Timing and Frequency Offset Estimation Algorithm for Filtered OFDM System

2020 ◽  
Author(s):  
Xingle Feng ◽  
Mengjie Wang ◽  
Li Chen ◽  
Wenxia Zhu ◽  
Kun Hua
Keyword(s):  
Frequency Domain ◽  
Time Domain ◽  
Frequency Offset ◽  
Training Sequence ◽  
Spectrum Efficiency ◽  
Estimation Accuracy ◽  
Timing Synchronization ◽  
Ofdm System ◽  
Pn Sequence ◽  
Training Symbol

Abstract As a critical technology of 5G air interface waveform, F-OFDM not only inherits the technical advantages of OFDM, but also has outstanding advantages in system flexibility and spectrum efficiency. However, as a multi-carrier technology, it is still extremely sensitive to sample timing offset (STO) and carrier frequency offset (CFO). In this letter, an improved Park frequency domain training sequence (FS-Park) is proposed to complete STO and CFO estimation of F-OFDM system. Firstly, a real-value pseudorandom number (PN) sequence is sent to each subcarrier as training sequence in frequency domain, the corresponding time domain training symbol has a conjugate symmetry structure. Secondly, the training symbol is utilized for timing synchronization, then the fractional frequency offset is estimated based on the cyclic prefix in time domain. Finally, the integer frequency offset is estimated in frequency domain based on the auto-correlation of PN sequence. The simulation results illustrate that the FS-Park algorithm not only has a single pulse timing metric curve and great STO estimation accuracy, but also has better performance of CFO estimation than classical Park algorithm and Liang Xiao's method.

scholarly journals A Novel Timing and Frequency Offset Estimation Algorithm for Filtered OFDM System

2020 ◽  
Author(s):  
Xingle Feng ◽  
Mengjie Wang ◽  
Li Chen ◽  
Wenxia Zhu ◽  
Kun Hua
Keyword(s):  
Frequency Domain ◽  
Time Domain ◽  
Frequency Offset ◽  
Training Sequence ◽  
Spectrum Efficiency ◽  
Estimation Accuracy ◽  
Timing Synchronization ◽  
Ofdm System ◽  
Pn Sequence ◽  
Training Symbol

Abstract As a critical technology of 5G air interface waveform, F-OFDM not only inherits the technical advantages of OFDM, but also has outstanding advantages in system flexibility and spectrum efficiency. However, as a multi-carrier technology, it is still extremely sensitive to sample timing offset (STO) and carrier frequency offset (CFO). In this letter, an improved Park frequency domain training sequence (FS-Park) is proposed to complete STO and CFO estimation of F-OFDM system. Firstly, a real-value pseudorandom number (PN) sequence is sent to each subcarrier as training sequence in frequency domain, the corresponding time domain training symbol has a conjugate symmetry structure. Secondly, the training symbol is utilized for timing synchronization, then the fractional frequency offset is estimated based on the cyclic prefix in time domain. Finally, the integer frequency offset is estimated in frequency domain based on the auto-correlation of PN sequence. The simulation results illustrate that the FS-Park algorithm not only has a single pulse timing metric curve and great STO estimation accuracy, but also has better performance of CFO estimation than classical Park algorithm and Liang Xiao's method.

Receiver IQ mismatch estimation in PDM CO-OFDM system using training symbol

2017 ◽  
Vol 36 ◽  
pp. 417-421 ◽  
Author(s):  
Dandan Peng ◽  
Xiurong Ma ◽  
Xin Yao ◽  
Haoyuan Zhang
Keyword(s):  
Ofdm System ◽  
Training Symbol

Implement Synchronization Algorithms in OFDM System

2014 ◽  
Vol 926-930 ◽  
pp. 2490-2493
Author(s):  
Meng Ke Lu ◽  
Jian Xin Yuan
Keyword(s):  
Performance Analysis ◽  
Communication System ◽  
Phase Synchronization ◽  
Cyclic Prefix ◽  
Frequency Synchronization ◽  
Ofdm System ◽  
Awgn Channel ◽  
Training Symbol ◽  
And Performance ◽  
Theoretical Performance

With the advent of 4G, OFDM has an increasingly important role in the life of the system. This paper discusses the design simulation of the OFDM communication system, including coding, modulation, IFFT, synchronization, demodulation and decoding modules studied and discussed and cyclic prefix based on training symbol for OFDM system in time and frequency synchronization and phase synchronization algorithm and its performance, then introduced the SCME channel attributes. And those who have the OFDM system in AWGN channel and SCME channel emulation, and performance analysis, consistent with the theoretical performance.

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