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

Author(s):  
Xiurong Ma ◽  
Pengru Li ◽  
Haoyuan Zhang ◽  
Yunlong Shan ◽  
Meng Yang
Keyword(s):  
2017 ◽  
Vol 35 (9) ◽  
pp. 1551-1556 ◽  
Author(s):  
Qiong Wu ◽  
Liangjun Zhang ◽  
Xiang Li ◽  
Ming Luo ◽  
Zhenhua Feng ◽  
...  

2020 ◽  
Author(s):  
Xingle Feng ◽  
Mengjie Wang ◽  
Li Chen ◽  
Wenxia Zhu ◽  
Kun Hua

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.


2020 ◽  
Author(s):  
Xingle Feng ◽  
Mengjie Wang ◽  
Li Chen ◽  
Wenxia Zhu ◽  
Kun Hua

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.


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

2014 ◽  
Vol 926-930 ◽  
pp. 2490-2493
Author(s):  
Meng Ke Lu ◽  
Jian Xin Yuan

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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