排序方式: 共有36条查询结果,搜索用时 968 毫秒
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在现实通信系统中,由于各种原因在发送端获知很难获得完全的信道状态信息,只能获得部分信道状态信息,这样接收端的检测就非常复杂。在MIMO系统中,为了提高系统的性能和降低接收端算法的复杂度,可以通过把正交空时分组与线性预编码结合。本文提出了一种在MIMO非相关信道中,在部分信道状态信息的条件下,把正交空时分组码与线性预编码结合的方案。仿真结果表明,提高了MIMO系统的性能,降低系统误码率,获得了很好的性能增益。 相似文献
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PEP与阴离子表面活性剂复配体系泡沫性能的研究 总被引:6,自引:0,他引:6
研究了PEP型非离子表面活性剂分别与十二烷基苯磺酸钠(DBS),十二烷基硫酸钠(SDS)形成复配体系的泡沫性能,讨论了浓度及配比的变化对泡沫性能的影响,结果表明起泡性和稳泡性皆随混合表面活性剂的浓度的上升而增强;在一定浓度下,随着PEP比例下降,起泡性和稳泡性也随着增大,并达到稳定值。 相似文献
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This article reviews the most common, useful methods for the chiral determination of amphetamine (AM) and AM-derived designer drugs in different of matrix, including blood, hair, urine, medicaments or standard solutions, taking into consideration articles published in the past 15 years. We consider chromatographic methods (e.g., gas, liquid, high-performance liquid, and thin layer). We describe several types of chiral derivatization reagent, mobile-phase additive and chiral stationary phase commonly used in the chromatographic methods. Tables summarize basic information about conditions (e.g., type of column and mobile phase), detection mode and reference data for each procedure. 相似文献