CHANNEL ESTIMATION FOR OFDM SYSTEMS BASED ON COMB-TYPE PILOT

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AB s TR ACT

In this paper, the channel estimation methods for OFDM systems based on comb-type pilot sub-carrier arrangement are investigated.The channel estimation algorithm based on combtype pilots is divided into pilot signal estimation and channel
interpolation. The pilot signal estimation based on LS or MMSE criteria, together with channel interpolation based on
piecewise-linear interpolation or piecewise second-order polynomial interpolation is studied. Owing to the MMSE estimate
of pilot signals, the inter-carrier interference and additive white Gaussian noise are reduced considerably. The mputational
complexity of pilot signal estimation based on MMSE criterion can be reduced by using a simplified LMMSE estimator with low-rank approximation using singular value decomposition.Phase compensators before and after interpolation are also
presented to combat the phase changes of subchannel symbols arising from the frame synchronization errors. Comparing to the transform-domain processing based channel estimation algorithm, the MMSE estimate of pilot signals together with phase compensated linear interpolation algorithm provides better performance and requires less omputations.

风筝

好像也看不懂！

radio3000

要是中文我就看了，可惜是E文啊

zwmfyy

哈，专业有难度，还全是鸟文的。

蚊子都睡啦

不明白。。。。

lucyhkgo

明天就放假，可以好好休息了