Channel Estimation for OFDM Systems with Transparent Multi-Hop Relays

Kyung-Soo WOO
Hyun-Il YOO
Yeong-Jun KIM
Kyu-In LEE
Chang-Hwan PARK
Heesoo LEE
Hyun-Kyu CHUNG
Yong-Soo CHO

IEICE TRANSACTIONS on Communications   Vol.E90-B    No.6    pp.1555-1558
Publication Date: 2007/06/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e90-b.6.1555
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technologies
multi-hop relays,  propagation delay,  OFDM,  LS channel estimation,  cooperative diversity,  

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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).