Using Zero Padding for Robust Channel Estimation in SEFDM Systems

Ozan, Waseem; Grammenos, Ryan; Darwazeh, Izzat

doi:10.1109/csndsp49049.2020.9249488

Cited by 2 publications

(1 citation statement)

References 27 publications

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“…To avoid interference between carriers (ICI), which is brought on by a multi-path channel with fading, the transmitter in the OFDM system modulates a series of message bits into symbols using phase-shift keying (PSK) or quadrature amplitude modulation (QAM), performs time domain conversion using reverse Fast Fourier Transform (IFFT), and then a guard interval is appended to the signal before sending it through the wireless channel. In OFDM, there are two well-known types of guard intervals: cyclic prefix (CP) [4,5] and zero padding (ZP) [6,7]. CP is inserted into the transmitter in the conventional OFDM system to ensure maximum bandwidth efficiency and high wireless data transfer speeds.…”

Section: Introductionmentioning

confidence: 99%

Subspace Blind Channel Estimation Methods in OFDM Systems under Multi-path Channels

Al-Qadhi,

Abdul-Rahaim,

Sahib

et al. 2024

Preprint

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In this paper, we compare two methods of subspace blind channel estimation in orthogonal frequency division multiplexing (OFDM) systems using different guard intervals under a multi-path channel with an exponentially decaying power profile. In both methods, we propose the same solution to solve the scalar ambiguity problem, which is a common problem in subspace blind estimation methods, by using a single pilot signal. The bit error rate (BER) and the normalized mean square error (NMSE) of the estimated channel vector were compared under various signal-to-noise ratio (SNR) and different numbers of transmitted OFDM symbols. The impact of using different positions of the pilot signal is also demonstrated. The results of channel estimation, data detection, and system complexity show that the zero padding (ZP) model is superior to the model with a cyclic prefix (CP).

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Section: Introductionmentioning

confidence: 99%

Subspace Blind Channel Estimation Methods in OFDM Systems under Multi-path Channels

Al-Qadhi,

Abdul-Rahaim,

Sahib

et al. 2024

Preprint

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Alignment Signal Aided CP-Free SEFDM

Sun

Ozan

Levanen

et al. 2020

2020 IEEE 31st Annual International Symposium on Personal, Indoor and Mobile Radio Communications

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This paper proposes a cyclic prefix (CP) free spectral efficiency frequency division multiplexing (SEFDM) wireless signal transmission and reception method based on alignment signal (AS). The method needs the cooperation of both the transmission and reception sides. At the transmitter, time-domain AS is designed to prevent inter-symbol interference (ISI) caused by multipath propagation in the received signal. At the receiver, the channel circularity convolution providing processing is used to enable high accurate frequency domain one-tap equaliser. The extensive computer simulation results under the 5G new radio (5G-NR) channel model, TDL-D, show the that the AS aided SEFDM has similar bit error rate performance as CP-SEFDM without energy and latency cost on CP. The AS-SEFDM capability to mitigate the ISI and to enable the one-tap equaliser in SEFDM systems makes it a promising technique for future wireless communication systems.

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Using Zero Padding for Robust Channel Estimation in SEFDM Systems

Cited by 2 publications

References 27 publications

Subspace Blind Channel Estimation Methods in OFDM Systems under Multi-path Channels

Subspace Blind Channel Estimation Methods in OFDM Systems under Multi-path Channels

Alignment Signal Aided CP-Free SEFDM

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