S-Space College of Engineering/Engineering Practice School (공과대학/대학원) Dept. of Electrical and Computer Engineering (전기·정보공학부) Others_전기·정보공학부
Design of Pilot Pattern for Channel Estimation in OFDM Systems
- Choi, Inho; Lee, Yong-Hwan
- Issue Date
- 통신정보 합동학술 대회(JCCI), 2003년 4월
- Channel estimation is necessary for coherent detection in orthogonal frequency division multiplexing (OFDM) receivers. For accurate estimation, known pilot symbols are sent with data symbols at the transmitter. In general, these pilot symbols are placed with a regular pattern in two-dimensional (2-D) time-frequency grid. In a static additive Gaussian noisy channel, the channel estimation performance is known to depend not on the pilot pattern, but only on the pilot density. In time-variant frequency-selective fading channel, however, both the pilot pattern and the pilot density significantly affect the channel estimation performance. In this paper, we analytically design the pilot pattern so as to maximize the channel performance when a piecewise linear interpolation filter is used for channel estimation in data-inserted region. Finally, the analytic design is verified by computer simulations.
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