scholarly journals Wideband Channel Estimation and Prediction in Single-Carrier Wireless Systems

2005 ◽  
Author(s):  
Wei Liu ◽  
Lie-Liang Yang ◽  
L. Hanzo
Keyword(s):  
Channel Estimation ◽  
Wireless Systems ◽  
Estimation And Prediction ◽  
Single Carrier ◽  
Wideband Channel

scholarly journals Block Iterative/Adaptive Frequency-Domain Channel Estimation for Cyclic-Prefixed Single-Carrier Broadband Wireless Systems

2008 ◽  
Vol 2008 ◽  
pp. 1-7
Author(s):  
Jong-Seob Baek ◽  
Jong-Soo Seo
Keyword(s):  
Channel Estimation ◽  
Frequency Domain ◽  
Correction Term ◽  
Wireless Systems ◽  
Posteriori Error ◽  
Broadband Wireless ◽  
Single Carrier ◽  
Channel Frequency Response ◽  
Estimation Scheme ◽  
The Web

This paper presents a new block iterative/adaptive frequency-domain channel estimation scheme, in which a channel frequency response (CFR) is estimated iteratively by the proposed weighted element-wise block adaptive frequency-domain channel estimation (WEB-CE) scheme using the soft information obtained by a soft-input soft-output (SISO) decoder. In the WEB-CE, an equalizer coefficient is calculated by minimizing a weighted conditional squared-norm of the a posteriori error vector with respect to its correction term. Simulation results verify the superiority of the WEB-CE in a time-varying typical urban (TU) channel.

scholarly journals Low-to-Zero-Overhead IRS Reconfiguration: Decoupling Illumination and Channel Estimation

2021 ◽  
Author(s):  
Vahid Jamali
Keyword(s):  
Phase Shift ◽  
Channel Estimation ◽  
Wireless Systems ◽  
Mobile User ◽  
Base Station ◽  
Channel State ◽  
Major Bottleneck ◽  
Reconfiguration Overhead ◽  
Reflecting Surfaces ◽  
Special Case

Most algorithms developed so far for the optimization of Intelligent Reflecting Surfaces (IRSs) require knowledge of full Channel State Information (CSI). However, the resulting acquisition overhead constitutes a major bottleneck for the realization of IRS-assisted wireless systems in practice. In contrast, in this paper, focusing on downlink transmissions from a Base Station (BS) to a Mobile User (MU) that is located in a blockage region, we propose to optimize the IRS for illumination of the area centered around the MU. Hence, the proposed design requires the estimation of the MU’s position and not the full CSI. For a given IRS phase-shift configuration, the end-to-end BS-IRS-MU channel can then be estimated using conventional channel estimation techniques. The IRS reconfiguration overhead for the proposed scheme depends on the MU mobility as well as how wide the coverage of the IRS illumination is. Therefore, we develop a general IRS phase-shift design, which is valid for both the near- and far-field regimes and features a parameter for tuning the size of the illumination area. Moreover, we study a special case where the IRS illuminates the entire blockage area, which implies that the IRS phase shifts do not change over time leading to zero overhead for IRS reconfiguration.

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