Reducing the effect of the nonlinear distortion in 16-APSK OFDM system by pilot-based automatic phase shift
177 viewsDOI:
https://doi.org/10.54939/1859-1043.j.mst.95.2024.12-19Keywords:
OFDM; Nonlinear distortion; HPA; APS-pilot.Abstract
The paper proposed a method to reduce the effect of nonlinear distortion in 16-APSK OFDM system, which is a pilot-based automatic phase shift at the receiver. Transmitted pilot is inserted during the OFDM modulation process in the transmitter. When the pilot passes through the HPA, information about the nonlinear distortion of the HPA will be carried. In the receiver, the phase angle is rotated automatically based on the phase difference between the received pilots and the transmitted pilots, without depending on the HPA amplifier or system parameters. When the OFDM system uses the APS-pilot method, the nonlinear distortion reduction performance is approximately the same as in the OAPS method, the empirical formula to calculate OAPS, as well as the preset of OAPS manually at the receiver, is not needed.
References
[1]. P. Banelli, L. Rugini and S. Cacopardi, “Optimum Output Power Back-off in Non-linear Channels for OFDM based WLAN”, IEEE ISSPIT 2002, 06125, Italy, (2002).
[2]. P. K. Sharma, P. K. Nagaria and T. N. Sharma, “Enhancement of Power Effciency in OFDM System by SLM with Predistortion Technique”, Journal of telecommunication and information technology (2011).
[3]. T. Nojima and Y. Okamoto, “Predistortion Nonlinear Compensator for Microwave SSb-AM System”, IEEE, ICC’80 (1980).
[4]. G. S. Deepender Gill, “PAPR Reduction in OFDM Systems using Non-Linear Companding Transform”, IOSR Journal of Electronics and Communication Engineering (IOSR-JECE), vol. 9, pp. 133-140 (2014). DOI: https://doi.org/10.9790/2834-0928133140
[5]. N. Q. Binh, J. Bérces and I. Frigyes, “Estimation of the Effect of Nonlinear High Power Amplifier in M-QAM Radio-Relay Systems”, Periodica Polytechnica Electrical Engineering, Technical University of Budapest, vol. 39 (1995).
[6]. Nguyễn Tất Nam, Nguyễn Quốc Bình và Nguyễn Thành, "Nghiên cứu kết hợp tính toán tham số lượng thiệt hại khoảng cách và quay pha phụ tối ưu để giảm méo phi tuyến trên hệ thống thông tin vô tuyến sử dụng điều chế 16-APSK", Tạp chí Khoa học và kỹ thuật, Học viện Kỹ thuật Quân sự, số 168 (2015) (in Vietnamese).
[7]. Đoàn Thanh Hải và Nguyễn Quốc Bình, "Sử dụng quay pha phụ tối ưu sóng mang thu để giảm ảnh hưởng riêng của méo phi tuyến trong hệ thống OFDM'', Tạp chí Nghiên cứu KH và CN quân sự Hà Nội, (2016) (in Vietnamese).
[8]. Nguyễn Văn Vĩnh, Đoàn Thanh Hải, Lý Thị Thanh Hà và Phạm Ngọc Thắng, "Sử dụng phương pháp quay pha phụ tối ưu để giảm ảnh hưởng của méo phi tuyến trong hệ thống 64-QAM OFDM'', Tạp chí Nghiên cứu KH và CN quân sự Hà Nội, (2021) (in Vietnamese).
[9]. J. Rinne and M. Renfors, “Pilot spacing in orthogonal frequency division multiplexing systems on practical channels”, IEEE Trans. Consumer Electron., vol. 42, pp. 959-962, (1996). DOI: https://doi.org/10.1109/30.555792
[10]. R. Negi and J. Cioffi, “Pilot Tone selection for channel estimation in a OFDM system”, IEEE Trans. on Consumer Electronics, (1998). DOI: https://doi.org/10.1109/ICCE.1998.678433
[11]. F. Wang, “Pilot-Based Channel Estimation in OFDM System”, [Master's thesis, University of Toledo]. OhioLINK Electronic Theses and Dissertations Center, (2011). http://rave.ohiolink.edu/etdc/view?acc_num=toledo1302129482
[12]. J. A. Sam, A.K. Nair, “Analysis and implementation of channel estimation in OFDM system using pilot symbols”, International Conference on Control, Instrumentation, Communication and Computational Technologies (ICCICCT), pp. 725–728, (2016).
