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A Recursive ICI Cancellation Technique for Cooperative STBC-OFDM Systems with Carrier Frequency Offsets  

Kim, Yeong-Jun (중앙대학교 전자전기공학부 디지털통신연구실)
Woo, Kyung-Soo (중앙대학교 전자전기공학부 디지털통신연구실)
Yoo, Hyun-Il (중앙대학교 전자전기공학부 디지털통신연구실)
Lee, Hee-Soo (한국전자통신연구원)
Cho, Yong-Soo (중앙대학교 전자전기공학부 디지털통신연구실)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.32, no.10A, 2007 , pp. 950-957 More about this Journal
Abstract
In this paper, a recursive intercarrier interference (ICI) cancellation technique for cooperative space-time block coded orthogonal frequency division multiplexing (STBC-OFDM) with different carrier frequency offsets (CFOs) is proposed. Also, different CFOs existing in a cooperative STBC-OFDM system is shown to produce phase difference in the received signal, causing noise enhancement effect in the STBC decoding process. The performance degradation caused by the noise enhancement effect can be effectively reduced by a proposed ML-based recursive ICI cancellation technique. It is shown by computer simulation that the proposed recursive ICI cancellation technique is effective in reducing ICI, especially for STBC-OFDM systems with a large FFT size and large CFOs.
Keywords
Cooperative Relays; Carrier Frequency Offset; OFDM; STBC; Recursive ICI Cancellation;
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