文章基本信息

标题：Nonlinear Channel Estimation Based on Multi-level PN Sequences in OFDM Systems
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作者：Nanqing Zhou ; Hao Liu
期刊名称：International Journal of Hybrid Information Technology
印刷版ISSN：1738-9968
出版年度：2008
卷号：1
期号：2
出版社：SERSC
摘要：Nonlinear distortion of power amplifier is one of the major factor that degrades the performance of OFDM systems .Instead of estimating the nonlinearity at transmitter such as ordinary pre-distortion (PD), this paper estimates the nonlinearity of amplifier at the receiver. The problem is that nonlinear and multipath dispersion mix together at receiver end. And their parameters are generally unknown, so conventional method doesn't work well. In this paper, an algorithm that estimates both the nonlinear parameters of the power amplifier and the impulse response of the wireless channel is proposed. Multi-level PN sequences are transmitted to construct a Vandermonde matrix, which separates the nonlinearity and linearity into different subspaces. The separation makes it easy to estimate the nonlinearity and linearity independently