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Pilot-aided rayleigh fading channel estimation using MMSE estimator for DS-CDMA system

机译:DS-CDMA系统中使用MMSE估计器的导频瑞利衰落信道估计

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In this paper, we have developed a pilot-aided channel estimator for the direct-sequence code-division multiple-access (DS-CDMA) communication system based on the minimum mean-square error (MMSE) estimate of the attenuated antipodal transmitted signals in the presence of both fading and noise. Specifically we have considered the scenario of downlink synchronous DS-CDMA transmitter along with Rayleigh fading and the additive white Gaussian noise (AWGN) environment. The proposed receiver consists of a matched filter which is matched to the signature waveform of the desired user followed by a nonlinear estimation device. This non-linear device results from the MMSE estimate of the attenuated transmitted signal. Simulations were carried out to corroborate the theoretical findings for different values of signal-to-noise ratio (SNR) and number of users.
机译:在本文中,我们基于对映体中衰减对映体发射信号的最小均方误差(MMSE)估计,为直接序列码分多址(DS-CDMA)通信系统开发了一种导频辅助信道估计器衰落和噪音的存在。具体来说,我们考虑了下行链路同步DS-CDMA发射机以及瑞利衰落和加性高斯白噪声(AWGN)环境的场景。所提出的接收器由匹配滤波器组成,该滤波器与所需用户的特征波形匹配,之后是非线性估计装置。该非线性设备是由衰减后的发射信号的MMSE估计得出的。进行仿真以证实不同信噪比(SNR)值和用户数量的理论发现。

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