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21.
Channel state information of OFDM-STC system is required for maximum likelihood decoding.A subspace-based semi-blind method was proposed for estimating the channels of OFDM-STC systems.The channels are first estimated blindly up to an ambiguity parameter utilizing the nature structure of STC,irrespective of the underlying signal constellations.Furthermore,a method was proposed to resolve the ambiguity by using a few pilot symbols.The simulation results show the proposed semi-blind estimator can achieve higher spectral efficiency and provide improved estimation performance compared to the non-blind estimator. 相似文献
22.
根据包西铁路通道建设中双绕段改造的施工过程,尤其是田庄至呼家塔车站间双绕段的方案优化和施工组织,详细介绍了双绕段施工组织的特点、难点,以及施工过程中的注意事项。 相似文献