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This paper deals with optimal training design and placement over multiple orthogonal frequency division multiplexing(OFDM) symbols for the least squares(LS) channel estimation in multiple-input multipleoutput(MIMO) OFDM systems.First,the optimal pilot sequences over multiple OFDM symbols are derived by co-cyclic Jacket matrices based on the minimum mean square error(MSE) of the LS channel estimation.Then,an enhanced channel estimation method using sliding window is proposed to improve further the performanc... 相似文献
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随着生活水平的不断提高,人们对于视觉享受也有了新的要求,这就要求设计师们更新观念,重视版面设计,本文根据人们的需求,浅析了版面设计的艺术表现和创新。 相似文献