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基于SC-FDE（单载波频域均衡）和OFDM（正交频分复用）的60GHz通信系统,对联合信道估计的IQ不平衡补偿算法进行了研究。通过最小化CRE（信道残余能量）,在未知IQ不平衡参数时可得CIR（信道冲击响应）的最优解。一旦得到IQ不平衡参数,CIR的估计可以通过简单的替换计算来获得。因此,该算法可将信道与IQ不平衡分离开来进行灵活的补偿,且对训练序列没有任何限制。仿真结果表明,无论是60GHz LOS（视距）还是NLOS（非视距）信道,使用该方法均可得到很好的性能。

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Copyright of Bulletin of the Chinese Academy of Sciences / Chung-kuo ko Hsueh Yuan Yuan Kan is the property of Institutes of Science & Development, Chinese Academy of Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The aim of this study was to increase microbial fermented quality of corn straw, the optimal fermented conditions were selected by orthogonal design with three factors and three levels based on the main substrate of corn straw. After the optimal fermented condition was obtained, the further fermenting experiment was divided into three groups: the control group (without adding Lactobacillus plantarum and cellulase), single bacterial group (Lactobacillus plantarum 1 × 106 CFU/g), single enzyme group (cellulase 0.1 FPU/g air-dried matter), enzyme-bacteria group (Lactobacillus plantarum 1 × 106 CFU/g + cellulase 0.1 FPU/g air-dried matter). The results showed that the optimal composition of fermented substrates in dry matter was 96% corn straw, 2% corn meal and 2% cottonseed meal, plus 60% moisture, in which the best fermenting result was obtained. Based on the above fermented substrates, the highest score of fermentation was obtained after 28 days fermentation including both bacteria and enzyme additions, in which pH value (3.88) was significantly decreased (P<0.05), the counts of lactic acid bacteria were significantly increased (P< 0.05), the contents of NDF, ADF, cellulose and hemicellulose were significantly decreased (P<0.05), compared with the control group. In conclusion, the enzyme-bacteria combination can improve the fermentation quality of corn straw. [ABSTRACT FROM AUTHOR]

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Taking the temporal and spatial variation of soil moisture as the test object，this study applied the two-way earth-boring self-lifting sprinkler irrigation technolog^^ into Yanqing Ecological Test Base. What5 s more，the stratified sampling and water content monitoring analysis of the base soil before and after the application of the device were carried out. The main conclusions show that： a) the device can increase the volumetric water content，mass water content and relative water content of the base from less than 15%，11% and 50% before the implemen­tation of the device to more than 31%，22% and 103%，effectively solving the problem of insufficient soil water supply in crop grow-th stage； b) the device significantly increases the water content of shallow soils and maximizes the metabolic requirements of crop growth for water and ； the device has a significant water-saving effect and the water used for irrigation has been controlled to 2，800 m3/hm2 from 3，150 m3/hm2. [ABSTRACT FROM AUTHOR]

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