标题：Noise suppression threshold channel estimation method using RC and SRRC filters in OFDM systems
作者：Zhang, Mingtong ;Zhou, Xiao ;Wang, Chengyou
作者机构：[Zhang, Mingtong ;Zhou, Xiao ;Wang, Chengyou ] Electrical and Information Engineering, School of Mechanical, Shandong University, Weihai, China
会议名称：2018 18th IEEE International Conference on Communication Technology, ICCT 2018
会议日期：8 October 2018 through 11 October 2018
来源：International Conference on Communication Technology Proceedings, ICCT
关键词：Channel estimation; Noise threshold; Orthogonal frequency division multiplexing (OFDM); Raise cosine (RC) filter; Square root raise cosine (SRRC) filter
摘要：Orthogonal frequency division multiplexing (OFDM) has been widely used in modern wireless communication systems. In OFDM system, channel estimation is a key technology to improve the system performance. However, most conventional channel estimation methods cannot suppress the noise effectively, which affects the quality of the final received OFDM signals. To solve this problem, this paper utilizes the raise cosine (RC) filter and square root raise cosine (SRRC) filter to suppress the inter-symbol-interference (ISI) and the noise in OFDM-RC and OFDM-SRRC systems. The proposed method first filters out the noise by using RC filter or SRRC filter, while obtaining the noise standard deviation as the threshold. Then, the impact of noise is further reduced by setting the noise suppression threshold. Simulation results are shown to verify the effectiveness of the OFDM-RC and OFDM-SRRC systems over multipath propagation conditions. © 2018 IEEE.