Adaptive raised-cosine channel interpolation for pilot-aided OFDM systems

Authors:
Pei-Yun Tsai;Tzi-Dar Chiueh
Affiliations:
Department of Electrical Engineering, National Central University, Jhong-Li and Graduate Institute of Electronics Engineering and Department of Electrical Engineering, National Taiwan University, ...;Graduate Institute of Electronics Engineering and Department of Electrical Engineering, National Taiwan University, Taipei, Taiwan
Venue:
IEEE Transactions on Wireless Communications
Year:
2009

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Abstract

In this paper, we first show equivalence of OFDM channel estimation using time-domain windowing and using frequency-domain interpolation. Based on this equivalence, a new frequency-domain channel interpolator featuring the advantage of time-domain channel impulse response windowing is proposed. Furthermore, the proposed raised-cosine channel interpolator can adaptively adjust its coefficients to accommodate various channel power delay profiles. Both theoretical and simulation results verify that the proposed interpolator achieves more accurate channel estimation performance than other existing solutions.