EPC ?? ??? ?? ????
上傳時間: 2015-06-04
上傳用戶:gw0214
用vhdl實現數字鐘 其一,具有時,分,秒計數顯示功能,其中,要求以二十四小時循環及 時; 其二,具有清零,調節小時,分鐘功能; 其三,具有整點報時功能,而且在整點報時的同時 LED 燈花樣顯示。 其一,具有時,分,秒計數顯示功能,其中,要求以二十四小時循環及 時; 其二,具有清零,調節小時,分鐘功能; 其三,具有整點報時功能,而且在整點報時的同時 LED 燈花樣顯示。 其一,具有時,分,秒計數顯示功能,其中,要求以二十四小時循環及
標簽: 用vhdl實現數字鐘
上傳時間: 2015-06-24
上傳用戶:吧和GV會比較好
it is electronics pspice lab manual. very helpful for beginners. its is in the form of a lab manual. hope the READER will like it very much
標簽: orcad pspics electronics
上傳時間: 2016-01-10
上傳用戶:whu_lk
共軛梯度法為求解線性方程組而提出。后來,人們把這種方法用于求解無約束最優化問題, 使之成為一種重要的最優化方法。 共軛梯度法的基本思想是把共軛性與最速下降方法相結合, 利用已知點處的梯度構造一組共 軛方向, 并沿這組方向進行搜索, 求出目標函數的極小點。 根據共軛方向的基本性質, 這種 方法具有二次終止性。 在各種優化算法中, 共軛梯度法是非常重要的一種。 其優點是所需存 儲量小,具有步收斂性,穩定性高,而且不需要任何外來參數。 共軛方向 無約束最優化方法的核心問題是選擇搜索方向 . 在本次實驗中 , 我們運用基于共軛方向的一種 算法 — 共軛梯度法 三.算法流程圖: 四.實驗結果: (1). 實驗函數 f=(3*x1-cos(x2*x3)-1/2)^2+(x1^2-81*(x2+0.1)+sin(x3)+1.06)^2+(exp(-x1*x2)+20*x3+ 1/3*(10*3.14159-3))^2; 給定初始點 (0,0,0) , k=1 ,最 大迭代次數 n ? ? d 確定搜索方向 進 退 法 確 定 搜 索 區 間 分割法確定最 優步長
上傳時間: 2016-05-08
上傳用戶:saren11
16qam 隨著現代通信技術的發展, 特別是移動通信技術高速發展, 頻帶利用率問題 越來越被人們關注。 在頻譜資源非常有限的今天, 傳統通信系統的容量已經不能 滿足當前用戶的要求。正交幅度調制 QAM(Quadrature Amplitude Modulation) 以其高頻譜利用率、 高功率譜密度等優勢, 成為寬帶無線接入和無線視頻通信的 重要技術方案。 隨著現代通信技術的發展, 特別是移動通信技術高速發展, 頻帶利用率問題 越來越被人們關注。 在頻譜資源非常有限的今天, 傳統通信系統的容量已經不能 滿足當前用戶的要求。正交幅度調制 QAM(Quadrature Amplitude Modulation) 以其高頻譜利用率、 高功率譜密度等優勢, 成為寬帶無線接入和無線視頻通信的 重要技術方案。
上傳時間: 2016-06-26
上傳用戶:guh000
2018專升本操作系統綜合實踐題目參考
上傳時間: 2019-06-17
上傳用戶:aaaaa123
The concept of “smart city” is often used implying that the READER has a clear and common notion of what it means. However, in the current literature it is very hard to find a precise definition. What is even more interesting, it is not so easy to find a precise definition of what a city is.
標簽: Facilitating Developing Designing Cities Smart
上傳時間: 2020-05-25
上傳用戶:shancjb
The objective of this book is to allow the READER to predict the received signal power produced by a particular radio transmitter. The first two chapters examine propagation in free space for point-to-point and point-to-area transmission, respectively. This is combined with a dis- cussion regarding the characteristics of antennas for various purposes. In chapter 3, the effect of obstacles, whether buildings or mountains, is discussed and analytical methods, whereby the strength of a signal is the shadow of an obstacle can be predicted, are presented.
標簽: Propagation Essentials Radio Wave of
上傳時間: 2020-05-27
上傳用戶:shancjb
This book is an entry-level text on the technology of telecommunications. It has been crafted with the newcomer in mind. The twenty-one chapters of text have been prepared for high-school graduates who understand algebra, logarithms, and the basic principles of electricity such as Ohm’s law. However, it is appreciated that many READERs require support in these areas. Appendices A and B review the essentials of electricity and mathematics up through logarithms. This material was placed in the appendices so as not to distract from the main theme, the technology of telecommunication systems. Another topic that many in the industry find difficult is the use of decibels and derived units. Appendix C provides the READER a basic understanding of decibels and their applications. The only mathematics necessary is an understanding of the powers of ten
標簽: Telecommunications Fundamentals 2nd of ed
上傳時間: 2020-05-27
上傳用戶:shancjb
Fundamentals of WiMAX was consciously written to appeal to a broad audience, and to be of value to anyone who is interested in the IEEE 802.16e standards or wireless broadband networks more generally. The book contains cutting-edge tutorials on the technical and theoretical under- pinnings to WiMAX that are not available anywhere else, while also providing high-level over- views that will be informative to the casual READER.
標簽: Understanding Fundamentals WiMAX of
上傳時間: 2020-05-27
上傳用戶:shancjb