ACPR (adjacent channel power ratio), AltCPR (alternatechannel power ratio), and noise are important performancemetrics for digital communication systems thatuse, for example, WCDMA (wideband code division multipleaccess) modulation. ACPR and AltCPR are bothmeasures of spectral regrowth. The power in the WCDMAcarrier is measured using a 5MHz MEASUREMENT bandwidth;see Figure 1. In the case of ACPR, the total powerin a 3.84MHz bandwidth centered at 5MHz (the carrierspacing) away from the center of the outermost carrier ismeasured and compared to the carrier power. The resultis expressed in dBc. For AltCPR, the procedure is thesame, except we center the MEASUREMENT 10MHz awayfrom the center of the outermost carrier.
標(biāo)簽： AltCPR WCDMA 5528 ACPR
上傳時間： 2013-11-02
上傳用戶：maricle
Accurate MEASUREMENT of the third order intercept pointfor low distortion IC products such as the LT5514 requirescertain precautions to be observed in the test setup andtesting procedure. The LT5514 linearity performance ishigh enough to push the test equipment and test set-up totheir limits. A method for accurate MEASUREMENT of thirdorder intermodulation products, IM3, with standard testequipment is outlined below.It is also important to correctly interpret the LT5514specification with respect to ROUT, and the impact ofdemo-board transmission-line termination loss whenevaluating the linearity performance, as explained in theLT5514 Datasheet and in Note 1 of this document.
標(biāo)簽： 5514 LT 三階互調(diào) 精確測量
上傳時間： 2013-11-14
上傳用戶：l254587896
LabVIEW2011已經(jīng)發(fā)布，可以到官網(wǎng)下簡體載中文版的，http://download.ni.com/support/softlib/，但對于注冊機來說，許多剛接觸這款注冊機的朋友并不太會用，其與以往的LabVIEW注冊機不太一樣，這款注冊機要比以往的注冊機功能上強大許多，如果會用它可以注冊NI 2011系列所有的軟件LabWindows MEASUREMENT-Studio等等，針對網(wǎng)上許多朋友提出不會使用這種情況，我在這里以破解LabVIEW 2011為例，給大家示范一下，其他軟件也一樣。
標(biāo)簽： Activator License NI 注冊機
上傳時間： 2014-01-22
上傳用戶：gdgzhym
虛擬儀器技術(shù)（NI）就是利用高性能的模塊化硬件，結(jié)合高效靈活的軟件來完成各種測試、測量和自動化的應(yīng)用。靈活高效的軟件能幫助您創(chuàng)建完全自定義的用戶界面，模塊化的硬件能方便地提供全方位的系統(tǒng)集成，標(biāo)準(zhǔn)的軟硬件平臺能滿足對同步和定時應(yīng)用的需求。這也正是NI近30年來始終引領(lǐng)測試測量行業(yè)發(fā)展趨勢的原因所在。只有同時擁有高效的軟件、模塊化I/O硬件和用于集成的軟硬件平臺這三大組成部分，才能充分發(fā)揮虛擬儀器技術(shù)性能高、擴展性強、開發(fā)時間少，以及出色的集成這四大優(yōu)勢。 軟件是虛擬儀器技術(shù)中最重要的部份。使用正確的軟件工具并通過調(diào)用特定的程序模塊，工程師和科學(xué)家們可以高效地創(chuàng)建自己的應(yīng)用以及友好的人機交互界面。NI公司提供的行業(yè)標(biāo)準(zhǔn)的圖形化編程軟件——NI LabVIEW，不僅能輕松方便地完成與各種軟硬件的連接，更能提供強大的數(shù)據(jù)處理能力，并將分析結(jié)果有效地顯示給用戶。此外，NI還提供了許多其它交互式的測量工具和系統(tǒng)管理軟件工具，例如連接設(shè)計與測試的交互式軟件SignalExpress、基于ANSI-C語言的LabWindows/CVI、支持微軟Visual Studio的MEASUREMENT Studio等等，這些軟件均可滿足客戶對高性能應(yīng)用的需求。
上傳時間： 2013-10-17
上傳用戶：Thuan
系統(tǒng)下,地球坐標(biāo)轉(zhuǎn)換的源代碼,在WGS-84坐標(biāo)和北京54坐標(biāo)之間的一套轉(zhuǎn)換參數(shù),可以全國通用的，在每個地方會不一樣，因為它們是兩個不同的橢球基準(zhǔn)。 // WGS2GK.CPP : C++ version of Ottmar Labonde s WGSDHDN3.PAS with CPU time MEASUREMENT // compile with MS Visual C++ version 6.0 or do the necessary modifications for your compiler // // Conversion of
上傳時間： 2014-01-09
上傳用戶：hxy200501
一個非常好的時間序列工具箱，詳細(xì)使用說明見P. M. T. Broersen, Automatic Spectral Analysis with Time Series Models, IEEE Transactions on Instrumentation and MEASUREMENT, Vol. 51, No. 2, April 2002, pp. 211-216.
上傳時間： 2014-01-14
上傳用戶：古谷仁美
紅外線開發(fā)資料，紅外線協(xié)議，Infrared Data Association Serial Infrared Physical Layer MEASUREMENT Guidelines
上傳時間： 2014-12-04
上傳用戶：jjj0202
A self-designed control of PC parallel port communication is introduced in this paper.Taking advantage of the MFC ActiveX technology, it is developed in Visual C++ and offset the scarcity of the control of PC parellel paort communication. An example of frequency MEASUREMENT shows the detail procedure and application of the control.
標(biāo)簽： self-designed communication introduced parallel
上傳時間： 2015-12-02
上傳用戶：Miyuki
To estimate the input-output mapping with inputs x ％ and outputs y generated by the following nonlinear, ％ nonstationary state space model: ％ x(t+1) = 0.5x(t) + [25x(t)]/[(1+x(t))^(2)] ％ + 8cos(1.2t) + process noise ％ y(t) = x(t)^(2) / 20 + 6 squareWave(0.05(t-1)) + 3 ％ + time varying MEASUREMENT noise ％ using a multi-layer perceptron (MLP) and both the EKF and ％ the hybrid importance-samping resampling (SIR) algorithm.
標(biāo)簽： input-output the generated following
上傳時間： 2014-01-05
上傳用戶：royzhangsz
To fully utilize the available spectrum for a wireless communication system it is feasible to adapt to different situations on the channel. In this paper a flexible OFDM transmitter is presented together with basic theory behind OFDM transmission. It is shown that high flexibility can be obtained with a reasonable amount Flexible baseband transmitter for OFDM of additional hardware. Part of the design, the FFT-processor, has already been fabricated and MEASUREMENT results are presented.
標(biāo)簽： communication available feasible spectrum
上傳時間： 2016-03-23
上傳用戶：BOBOniu
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