Abstract
The detection performance of coherent OFDM receiver significantly depends on the accuracy of channel estimation. The accuracy of channel estimation can be improved by properly post-processing the channel estimate using a so called channel estimation filter (CEF). Linear minimum mean-squared error (MMSE) filter is optimum as the CEF, but it may not practical due to implementation complexity. We consider the use of a reduced-complexity CEF whose tap coefficient is real valued and symmetrically weighted (RSW). The optimum RSW CEF is analytically designed using the multi-path intensity profile and SNR of the channel. We also propose a method to adapt the coefficient of the RSW CEF to the channel condition. Numerical results show that the proposed RSW CEF can provide channel estimation performance comparable to that of a linear MMSE filter, while significantly reducing the computational complexity. In addition, the proposed RSW CEF can provide performance robust to unknown timing offset with a fractional dB loss compared to the optimum one.
Published Version
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