MISO visible light communication system utilizing hybrid post-equalizer aided pre-convergence of STBC decoding

In this Letter, we propose a modified hybrid linear and nonlinear post-equalizer to aid pre-convergence of space–time block coding(STBC) decoding in the formulated multiple-input-single-output(MISO) visible light communication(VLC) model. Meanwhile, we present a channel estimation algorithm, as the existing method is suboptimal. Experiments demonstrate that a data rate of 1 Gbit/s is easily achieved in 1.3 m indoor free space transmission with the bit error rate(BER) limited to 3.8 × 10~(-3). Correspondingly, the Q factor can be improved to 3.13 d B compared to the pure linear equalizer case.     

磷灰石中希土总量的比色测定

矿石中微量希土总量的分析,近年来多采用在强碱性溶液中加入三乙醇胺分离铁、锰等离子,然后以PMBP-苯萃取希土,偶氮胂Ⅲ光度测定,但是当磷、钙含量均高时,或者磷、钛共存时能使分析结果严重偏低。为了适用于测定磷灰石中微量希土总量,我们经试验拟定了在强碱性溶液中加入三乙醇胺、过氧化氢分离钛,以消除磷、钛共存的影响;在萃取时加入铜试剂以消除磷、钙共存的影响。本