電氣控制與plc實訓教程電子教案的第九部分B，對學習的人很有幫助，講解細致，思路清晰，我覺得相當不錯，與大家一起分享！
上傳時間： 2015-12-28
上傳用戶：aysyzxzm
一個由B/S做的寵物醫院，內容附帶數據庫文?？梢灾苯蛹茉O使用，吐血奉賢
標簽：
上傳時間： 2015-12-28
上傳用戶：671145514
We address the problem of blind carrier frequency-offset (CFO) estimation in quadrature amplitude modulation, phase-shift keying, and pulse amplitude modulation communications systems.We study the performance of a standard CFO estimate, which consists of first raising the received signal to the Mth power, where M is an integer depending on the type and size of the symbol constellation, and then applying the nonlinear least squares (NLLS) estimation approach. At low signal-to noise ratio (SNR), the NLLS method fails to provide an accurate CFO estimate because of the presence of outliers. In this letter, we derive an approximate closed-form expression for the outlier probability. This enables us to predict the mean-square error (MSE) on CFO estimation for all SNR values. For a given SNR, the new results also give insight into the minimum number of samples required in the CFO estimation procedure, in order to ensure that the MSE on estimation is not significantly affected by the outliers.
標簽： frequency-offset estimation quadrature amplitude
上傳時間： 2014-01-22
上傳用戶：牛布牛
matlab寫的B樣條函數的計算，計算插值點的值
上傳時間： 2014-01-02
上傳用戶：youmo81
This paper investigates the design of joint frequency offset and carrier phase estimation of a multi-frequency time division multiple access (MF-TDMA) demodulator that is applied to a digital video broadcasting—return channel system via satellite (DVB-RCS). The proposed joint estimation algorithm is based on the interpolation technique for two correlation values in the frequency and phase domains. This simple interpolation technique can significantly improve frequency and phase resolution capabilities of the proposed technique without increasing the number of the correlation values. In addition, the overall block diagram of a digital communications receiver for DVB-RCS is presented, which was designed using the proposed estimation algorithms. Index Terms—Carrier phase estimation, DVB-RCS, frequency offset estimation, interpolation, joint estimation, MF-TDMA.
標簽： investigates estimation frequency carrier
上傳時間： 2015-12-30
上傳用戶：ls530720646
(1)功能模塊: A :個人開戶功能 B :查詢功能 查詢個人用戶信息 查詢各個房間使用信息 查詢寄存物品信息 C :增加寄存物品模塊 用JAVA實現賓館客房管理系統
上傳時間： 2014-01-24
上傳用戶：稀世之寶039
使用DVCC實驗系統中的并行接口芯片8255A的B口作輸入口，使工作于方式1,將PB0～PB7連接到手動開關K1～K8,將手動脈沖信號SP作為8255B口的選通信號，連接到PC2。將B品工作于方式1時的中斷請求信號（PC0）連接到8255A的IR3,8255A的片選信號無需連接（系統已連接好）。8259A的CS連接地址譯碼輸出端Y6,8259A的端口地址為60H、61H
上傳時間： 2013-12-28
上傳用戶：xinyuzhiqiwuwu
B樹
標簽： 樹
上傳時間： 2013-12-17
上傳用戶：a6697238
Specification for conveying ITU-R System B Teletext in DVB bitstreams
標簽： Specification bitstreams conveying Teletext
上傳時間： 2014-02-18
上傳用戶：mikesering
)一個PB的應用程序, 能實現以下功能: a.新增員工資料 b.修改員工資料 c.刪除員工資料 d.按姓名查找員工資料(能模糊查找, 例如輸入"林", 則所有姓或名中含有"林"字的 員工全列出來.) e.系統啟動時, 針對今天為該員工生日的, 則自動彈出提示進行祝福. 2) 員工資料的數據必須有: 工號(為主鍵), 姓名, 出生日期, 入職日期, 部門, 職務 3) 數據庫類型為ASA8.0
上傳時間： 2016-01-03
上傳用戶：BIBI
