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A Pilot-Tone Based Channel Estimation Technique for Cooperative SFBC-OFDM Systems  

Park, Chang-Hwan (중앙대학교 전자전기공학부 디지탈통신연구실)
Ko, Yo-Han (중앙대학교 전자전기공학부 디지탈통신연구실)
Lee, Hee-Soo (한국전자통신연구원)
Cho, Yong-Soo (중앙대학교 전자전기공학부 디지탈통신연구실)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.33, no.9C, 2008 , pp. 661-668 More about this Journal
Abstract
In this paper, a channel estimation technique based on pilot tones is proposed for cooperative SFBC-OFDM systems with a STO(Symbol Timing Offset). In a cooperative SFBC-OFDM system, the STO between RS(Relay Station) and MS(Mobile Station) varies depending on the location of MS. Since the STO causes distortion in the form of phase rotation, a channel estimation technique based on linear interpolation with respect to phase and amplitude is proposed for the case of orthogonal pilot allocation. Also, a channel estimation technique is proposed by solving nonlinear equation for the case of pilot structure with orthogonal code. It is shown by computer simulation that the performance of channel estimation can be significantly improved when the proposed techniques are applied to cooperative SFBC-OFDM systems with STO.
Keywords
OFDM; MMR; Cooperative;
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