Description: a new method for identification of fast fading mobile channels. Estimates both the channel statistics and the time varying channel impulse respone on -line. -a new method for identification of fast fading mobile channels. Estimates both the channel statistics and the time varying channel impulse respone on-line. Platform: |
Size: 112640 |
Author:karti |
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Description: the use of coherent space-frequency coding in orthogonal frequency division multiplexing (OFDM)-based frequency-selective multiple-input multiple-output (MIMO) antenna fading channels has been proposed. Acquiring knowledge of the fading coefficients in a MIMO channel is already very challenging in the frequency-flat (fast) fading case. In the frequency-selective case, this task becomes significantly more difficult due to the presence of multiple paths, which results in an increased number of parameters to be estimated. In this paper, we address code design for noncoherent frequency-selective MIMO-OFDM fading links, where neither the transmitter nor the receiver knows the channel. We derive the code design criteria Platform: |
Size: 32768 |
Author:sourov |
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Description: A closed-loop power control system
having both fixed-step and adaptive-step power
control algorithms and incorporating with
multitap RAKE receivers was proposed.
Simulations were performed for wide-band radio
channels having path loss, slow fading, and fast
fading. As the measurement of the received power
and the bit energy-to-interfkrence power spectral
density ratio play an important role in a CDMA
power control system, a scheme to estimate these
two parameters was proposed. For a Rayleigh
fading channel and a Rician fading channel
having a K factor of 6dB, a three-tap RAKE
receiver is desirable. Platform: |
Size: 53248 |
Author:nani |
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Description: 这篇文章主要讲述了等离子鞘套的信道特征，包括电子密度的分布还有以此关于天线位置的安装等问题，得出结论可以建模为快衰落的莱斯信道，对于临近空间飞行器的通信问题提供了理论依据，但鞘套内部通信特征还是一大问题-This article describes the plasma sheath channel characteristics, including the distribution of electron density and thus the installation of the antenna position on issues such as the conclusion can be modeled as fast fading fading channels, for the approaching spacecraft communications problem provides a theoretical basis, but features an internal communication sheath or a big problem Platform: |
Size: 214016 |
Author:朱从莹 |
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Description: 程序详细地介绍了OFDM系统中导频信号信道估计的作用，适用于快衰落信道，能够快速跟踪均衡信道，同时包含一个详细介绍算法（LS MMSE）的算法文档。-Procedures described in detail in the pilot signal OFDM system channel estimation role for fast fading channels, fast track channel equalization, and contains a detailed algorithm (LS MMSE) algorithm documents. Platform: |
Size: 148480 |
Author:东方泓 |
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Description: Time and Frequency Synchronization Techniques for
OFDM Systems operating in Gaussian and Fading
Channels: A Tutorial
The aim of this paper is to survey and compare
previous methods for Data-aided timing and frequency
synchronization of OFDM System. In the sequel, we propose a fast
and accurate FFT-based frequency offset estimation. The
synchronization techniques are examined in Gaussian andMultipath fading environments for comparison. The results of the
performance comparison are presented in terms of mean andmean-square error (MSE) obtained by simulations. The timing
offset estimator with best performance is chosen for system timingsynchronization. The FFT-based frequency offset estimation
method has significantly smaller MSE than others can beperformed using the same timing training symbol. Therefore,there is only one training symbol needed as preamble in whole
synchronization process.
Platform: |
Size: 340992 |
Author:Mohamed |
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Search - fast Fading Channels