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IEICE Transactions on Communications 2007 E90-B(6):1555-1558; doi:10.1093/ietcom/e90-b.6.1555
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Copyright © 2007 The Institute of Electronics, Information and Communication Engineers

Regular Section -- Letters -- Wireless Communication Technologies

Channel Estimation for OFDM Systems with Transparent Multi-Hop Relays

Kyung-Soo WOO1, Hyun-Il YOO1, Yeong-Jun KIM1, Kyu-In LEE1, Chang-Hwan PARK1, Heesoo LEE2, Hyun-Kyu CHUNG2 and Yong-Soo CHO1

1 The authors are with the School of Electrical and Electronic Engineering, Chung-Ang Univ., Seoul, Korea. E-mail: yscho{at}cau.ac.kr, 2 The authors are with Electronics and Telecommunication Research Institute, Daejeon, Korea.


  Abstract

In this letter, the effect of a propagation delay resulting from the use of an OFDM system with a transparent mobile multi-hop relay (MMR) is initially analyzed. Then, a least square (LS) channel estimation technique for the OFDM system with throughput enhancement (TE) MMR or cooperative MMR is proposed. It is demonstrated by computer simulation that the proposed LS channel estimation technique for OFDM systems with transparent MMR is superior to the conventional technique in terms of mean square error (MSE) and bit error rate (BER).

Key Words: multi-hop relays, propagation delay, OFDM, LS channel estimation, cooperative diversity

Manuscript received October 6, 2006. Manuscript revised January 19, 2007.


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