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An Effective Channel Estimation for Massive MIMO–OFDM System

รศ.ดร.ธนัยรัตน์ มาต๊ะ | N/A

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An Effective Channel Estimation for Massive MIMO–OFDM System

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Collection	RMUTK Research Repository (RMUTK IR) วารสารวิชาการ — e-Journal Articles
ID RMUTK Digital	RMUTK000195
Title	An Effective Channel Estimation for Massive MIMO–OFDM System
Alternative title	An Effective Channel Estimation for Massive MIMO–OFDM System
Authors	รศ.ดร.ธนัยรัตน์ มาต๊ะ ผู้แต่งหลัก รศ.ดร.พิสิฐ บุญศรีเมือง (สถาบันเทคโนโลยีพระจอมเกล้าเจ้าคุณทหารลาดกระบัง)
Faculty	คณะวิศวกรรมศาสตร์
Journal Title	Wireless Personal Communications
ISSN	0929-6212
Volume / Issue / Pages	Vol.114 \| No.1 \| pp.209-226
Published	2020-04-28
Year	2563
Level	ระดับนานาชาติ (SCOPUS)
Quartile	Q2
DOI	10.1007/s11277-020-07359-2
Abstract	N/A
Abstract (EN)	The massive Multiple-Input and Multiple-Output Orthogonal Frequency Division Multiplexing (MIMO–OFDM) system provides a high data transmission for the next generation mobile communication i.e. 4G, 5G, etc. In the practical MIMO–OFDM system, N points of IFFT/FFT is larger than M data subcarriers (N>M) in each OFDM symbol to reject the aliasing after D/A converter. To demodulate information data, the channel responses for all MIMO channel links need to be estimated so as to employ in MIMO data detection for demodulation at the receiver. The discrete Fourier transform estimator (DFE) was proposed for the system which can estimate the MIMO channels accurately when N=M. However, its accuracy will be hugely degraded when N>M because of the oversampling of data transmission. To improve the estimation accuracy when N>M, the maximum likelihood estimator (MLE) was proposed for the system which can achieve higher estimation accuracy than that of the DFE. However, its accuracy will be degraded a lot in the massive MIMO–OFDM system when N>M, due to the estimation error increased in proportion to the increasing of NT transmit antennas. To solve these problems, this paper proposes a direct time-domain estimator (DTE) with preamble symbol with scattered-pilot (preamble-SCP) for the massive MIMO–OFDM system when N>M. In the proposed method, it is presented with three salient features; achieving higher estimation accuracy with keeping almost the same computational complexity as the conventional estimators, improving Bit-Error-Rate (BER) with low-complexity MIMO data detection, and providing higher transmission data rate compared with the MLE. Using the normalized MSE, BER and throughput evaluated by computer simulations, it can be verified that the proposed DTE with preamble-SCP obviously provides higher estimation accuracy, better BER with low-complexity MIMO data detection, and much higher transmission data rate which is approximately 32.5 Mbps gain over the MLE at 5 MHz-BW respectively.
Keywords (TH)	N/A
Keywords (EN)	Massive MIMO–OFDM Channel estimation Aliasing Transmission data rate
Access Level	Open Access (เปิดสาธารณะ)

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https://doi.org/10.1007/s11277-020-07359-2

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