Linear precoder design for correlated rician fading channel under imperfect CSI

In this paper, we have modeled a linear precoder for indoor multiuser multiple input multiple output (MU-MIMO) system with imperfect channel state information (CSI) at transmitter. The Rician channel is presumed to be mutually coupled and spatially, temporarily correlated. The imperfection with CSI...

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Bibliographic Details
Published in:China communications Vol. 20; no. 9; pp. 160 - 170
Main Author: Priya, S. B. M.
Format: Journal Article
Language:English
Published: China Institute of Communications 01.09.2023
School of Electrical and Electronics Engineering,SASTRA Deemed University,Thanjavur 613401,India
Subjects:
Antenna arrays
Channel estimation
channel estimation error
Correlation
Delays
feedback delay
MMSE linear precoder
mutual coupling
Receiving antennas
Rician channels
Simulation
spatial correlation
Weichselberger correlation model
Weichselberger correlation model
MMSE linear precoder
feedback delay
channel estimation error
spatial cor-relation
mutual coupling
ISSN:1673-5447
Online Access:Get full text
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Summary:In this paper, we have modeled a linear precoder for indoor multiuser multiple input multiple output (MU-MIMO) system with imperfect channel state information (CSI) at transmitter. The Rician channel is presumed to be mutually coupled and spatially, temporarily correlated. The imperfection with CSI is primarily due to the channel estimation error at receiver and feedback delay amidst the receiver and transmitter in CSI transmission. Along with, the insufficient spacing between the antenna at transmitter and receiver persuades mutual coupling (MC) among the array elements. In addition, the MIMO channel is presumed to be jointly correlated (Weichselberger correlation model). When we look back on the existing precoder design, it considered spatial correlation alone disregarding joint correlation of antenna array elements. With all above assumption, we have designed a linear precoder which minimizes mean squared error (MSE) subjected to total transmit power constraint for MU-MIMO system. The simulation results proven that proposed precoder shows substantial enhancement in bit error rate (BER) performance in comparison with the existing technique. The mathematical analysis corroborates the simulation results.
ISSN:1673-5447
DOI:10.23919/JCC.fa.2021-0167.202309