FFT-Based Channel Estimation Scheme in LTE-A Downlink System

Sangmi Moon, Hun Choe, Myeonghun Chu, Cheolwoo You, Huaping Liu, Jeong Ho Kim, Jihyung Kim, Dae Jin Kim, Intae Hwang

Research output: Contribution to journalArticlepeer-review


In this paper, we propose a channel estimation scheme for a long term evolution-advanced (LTE-A) downlink system. The proposed scheme uses the fast Fourier transform (FFT) interpolation scheme for the user moving at a high speed. The FFT interpolation scheme converts the channel frequency response obtained from the least square or minimum mean square error channel estimation scheme to a time-domain channel impulse response by using the inverse FFT (IFFT). After windowing the channel response in the time domain, the channel frequency response can be obtained using the FFT. We performed a system-level simulation based on the 20 MHz bandwidth of the 3rd Generation Partnership Project LTE-A downlink system. Simulation results show that the proposed channel estimation scheme can improve the signal-to-noise-plus-interference ratio, as well as the throughput and spectral efficiency, of a conventional system.

Original languageEnglish
Pages (from-to)5911-5929
Number of pages19
JournalWireless Personal Communications
Issue number4
StatePublished - 1 Oct 2017

Bibliographical note

Funding Information:
This work was supported by the ICT R&D program of MSIP/IITP. [14-000-04-001, Development of 5G Mobile Communication Technologies for Hyper-connected Smart Services]. This work was supported by the Human Resource Training Program for Regional Innovation and Creativity through the Ministry of Education and National Research Foundation of Korea (NRF-2014H1C1A1066568).

Publisher Copyright:
© 2017, Springer Science+Business Media New York.


  • Channel estimation
  • Downlink system
  • FFT interpolation
  • LTE-A
  • System level simulation


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