Performance Improvement of PSAM Channel Estimation Method for OFDM Systems over Frequency-Selective Channel

주파수 선택적 채널에서의 OFDM 시스템을 위한 PSAM 채널 추정 기법의 성능 개선

  • Kim, Young-Soo (Department of Electronic and Radio Engineering, Kyung Hee University) ;
  • Bae, Jeong-Gook (S/W Development Team, Wireless Business Group, Samsung Electronics)
  • 김영수 (경희대학교 전자전파공학과) ;
  • 배정국 (삼성전자 무선사업부 S/W 개발팀)
  • Received : 2012.01.13
  • Accepted : 2012.01.16
  • Published : 2012.02.29


In this paper, we propose a method to improve performance of pilot symbol assisted modulation(PSAM) channel estimation method for OFDM systems over frequency selective channel. When channel values are estimated, the low pilot density used for channel estimation increases not only the effective data rate but also power efficiency. Thus, the lower pilot density which is used for channel estimation is better for OFDM system. At first, we estimate the channel values which are located at the middle of adjacent pilots, and then all of the possible channel values are estiamted by using original pilot values and previously estimated pilot values. Furthermore, the error of estimated channel values is reduced by introducing guard interval which is designed acccording to maximum channel delay. Performance achieved with the proposed method is illustrated by simulation experiments in comparison with the existing methods in terms of mean squared error(MSE).


Channel Estimation;OFDM System;PSAM;MMSE


Supported by : 경희대학교


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