image enhancement in frequency domain
标签： enhancement frequency domain image
上传时间： 2014-08-13
上传用户：小宝爱考拉
This directory contains example ADSPBF535 code, written in assembly, that changes the frequency and voltage using the push button switches on the board.
标签： directory frequency contains assembly
上传时间： 2014-01-03
上传用户：evil
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.
标签： frequency-offset estimation quadrature amplitude
上传时间： 2014-01-22
上传用户：牛布牛
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.
标签： investigates estimation frequency carrier
上传时间： 2015-12-30
上传用户：ls530720646
demodulates the FM modulated signal Y at the carrier frequency Fc (Hz). Y and Fc have sample frequency Fs (Hz). FREQDEV is the frequency deviation (Hz) of the modulated signal.
标签： demodulates the modulated frequency
上传时间： 2014-01-06
上传用户：皇族传媒
uses the message signal X to modulate the carrier frequency Fc (Hz) and sample frequency Fs (Hz), where Fs > 2*Fc. FREQDEV (Hz) is the frequency deviation of the modulated signal.
标签： frequency the modulate message
上传时间： 2016-01-20
上传用户：569342831
tenx radio pll ic tr1002 and radio ic ta2111 and refence code .
上传时间： 2014-12-03
上传用户：ccclll
The design for respiratory frequency detection circuit using thermosensor
标签： thermosensor respiratory detection frequency
上传时间： 2014-01-09
上传用户：zuozuo1215
Simulation.and.Software.Radio.for.Mobile.Communications中的部分源码
标签： Communications Simulation Software Mobile
上传时间： 2013-12-12
上传用户：qb1993225
Orthogonal Time–Frequency Signalin Over Doubly Dispersive Channels，IEEE上的文章
标签： Orthogonal Dispersive Frequency Channels
上传时间： 2014-01-22
上传用户：xg262122
