This paper presents a simple method of forming sum and difference patterns with adaptivenulls. The effects on the sidelobe level and the pointing null of difference pattern by adaptive null areanalyzed. The result tha...This paper presents a simple method of forming sum and difference patterns with adaptivenulls. The effects on the sidelobe level and the pointing null of difference pattern by adaptive null areanalyzed. The result that the increment value of the envelope of the sidelobe level under the effect ofa null is less than l.6dB is proved. The formula about shift value of the pointing null which is thefunction of the jammer direction and array parameters is given in the paper.展开更多
In this article we shall examine several different types of figurative numbers which have been studied extensively over the period of 2500 years, and currently scattered on hundreds of websites. We shall discuss their...In this article we shall examine several different types of figurative numbers which have been studied extensively over the period of 2500 years, and currently scattered on hundreds of websites. We shall discuss their computation through simple recurrence relations, patterns and properties, and mutual relationships which have led to curious results in the field of elementary number theory. Further, for each type of figurative numbers we shall show that the addition of first finite numbers and infinite addition of their inverses often require new/strange techniques. We sincerely hope that besides experts, students and teachers of mathematics will also be benefited with this article.展开更多
智能反射面(Intelligent Reflecting Surface,IRS)可有效增强无线通信系统的鲁棒性。然而,信道估计开销巨大,且这些开销随IRS反射元数呈比例增加,增加了处理基于多个IRS辅助通信系统开销问题的难度。为此,提出基于反射控制模型的用户和...智能反射面(Intelligent Reflecting Surface,IRS)可有效增强无线通信系统的鲁棒性。然而,信道估计开销巨大,且这些开销随IRS反射元数呈比例增加,增加了处理基于多个IRS辅助通信系统开销问题的难度。为此,提出基于反射控制模型的用户和速率优化(Optimal Sum Rate of User Based on Reflection Control Pattern,OSRP)算法。构建反射控制模型,并根据反射链路的衰减信息,只选择部分IRS为用户提供反射服务,减少因估计信道状态信息(Channel State Information,CSI)产生的开销。依据不完备的CSI,优化波束赋形矩阵和IRS相位,进而提升用户和速率。仿真结果表明,相比于基于完备CSI的用户和速率优化算法,OSRP算法降低了算法的复杂度,提升了用户和速率。展开更多
文摘This paper presents a simple method of forming sum and difference patterns with adaptivenulls. The effects on the sidelobe level and the pointing null of difference pattern by adaptive null areanalyzed. The result that the increment value of the envelope of the sidelobe level under the effect ofa null is less than l.6dB is proved. The formula about shift value of the pointing null which is thefunction of the jammer direction and array parameters is given in the paper.
文摘In this article we shall examine several different types of figurative numbers which have been studied extensively over the period of 2500 years, and currently scattered on hundreds of websites. We shall discuss their computation through simple recurrence relations, patterns and properties, and mutual relationships which have led to curious results in the field of elementary number theory. Further, for each type of figurative numbers we shall show that the addition of first finite numbers and infinite addition of their inverses often require new/strange techniques. We sincerely hope that besides experts, students and teachers of mathematics will also be benefited with this article.
文摘智能反射面(Intelligent Reflecting Surface,IRS)可有效增强无线通信系统的鲁棒性。然而,信道估计开销巨大,且这些开销随IRS反射元数呈比例增加,增加了处理基于多个IRS辅助通信系统开销问题的难度。为此,提出基于反射控制模型的用户和速率优化(Optimal Sum Rate of User Based on Reflection Control Pattern,OSRP)算法。构建反射控制模型,并根据反射链路的衰减信息,只选择部分IRS为用户提供反射服务,减少因估计信道状态信息(Channel State Information,CSI)产生的开销。依据不完备的CSI,优化波束赋形矩阵和IRS相位,进而提升用户和速率。仿真结果表明,相比于基于完备CSI的用户和速率优化算法,OSRP算法降低了算法的复杂度,提升了用户和速率。
