CFO/Channel estimation algorithms for space-time block coded orthogonal frequency division multiplexing wireless relay networks without using cyclic prefix of OFDM

This study presents a simple technique, which is used to estimate both channel state and carrier frequency offset (CFO) in decode-and-forward relay systems, where coded orthogonal frequency division multiplexing is employed without cyclic prefix. On the basis of the least-square criterion, we derive...

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Vydané v:IET signal processing Ročník 13; číslo 7; s. 661 - 669
Hlavní autori: Lin, Tsui-Tsai, Hwang, Fuh-Hsin
Médium: Journal Article
Jazyk:English
Vydavateľské údaje: The Institution of Engineering and Technology 01.09.2019
Predmet:
block codes
carrier frequency
CFO estimate
CFO/Channel estimation algorithms
channel estimation
channel state
complete search method
cyclic prefix
estimation processing
initially proposed estimation technique
OFDM modulation
orthogonal frequency division multiplexing
relay systems
Research Article
simple technique
space–time block coding‐orthogonal frequency division
two‐dimensional complete search approach
wireless relay networks
orthogonal frequency division multiplexing
channel state
cyclic prefix
carrier frequency
complete search method
CFO/Channel estimation algorithms
estimation processing
channel estimation
CFO estimate
space–time block coding-orthogonal frequency division
block codes
simple technique
OFDM modulation
wireless relay networks
relay systems
two-dimensional complete search approach
initially proposed estimation technique
ISSN:1751-9675, 1751-9683, 1751-9683
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Popis
Shrnutí:This study presents a simple technique, which is used to estimate both channel state and carrier frequency offset (CFO) in decode-and-forward relay systems, where coded orthogonal frequency division multiplexing is employed without cyclic prefix. On the basis of the least-square criterion, we derive the estimate of CFO and channel with the aids of consecutive blocks of pilot symbols. The initially proposed estimation technique achieves a distinguished performance by using a two-dimensional complete search approach; however, the computation becomes more and more intensive when the search granularity becomes finer and finer. For this reason, we further present an iterative approach as an alternative solution, which provides a performance comparable with that of the complete search method, while greatly reducing the implementation complexity. Besides, we also derive a closed-form expression of the CFO estimate for the considered system, which allows us to avoid the exhaustive search during the estimation processing. Computer simulations have been conducted to verify the efficiency of the proposed schemes.
ISSN:1751-9675
1751-9683
1751-9683
DOI:10.1049/iet-spr.2018.5289