A DFT-based Low Complexity LMMSE Channel Estimation Technique for OFDM Systems

• Autorzy: Patra Jyoti P. , Pradhan Bibhuti Bhusan , Singh Poonam

Identyfikatory

DOI

10.26636/jtit.2022.148720

• Języki publikacji: EN

Abstrakty

EN

The linear minimum mean square error (LMMSE) channel estimation technique is often employed in orthogonal frequency division multiplexing (OFDM) systems because of its optimal performance in the mean square error (MSE) performance. However, the LMMSE method requires cubic complexity of order O(N 3 p ), where Np is the number of pilot subcarriers. To reduce the computational complexity, a discrete Fourier transform (DFT) based LMMSE method is proposed in this paper for OFDM systems in the frequency selective channel. To validate the proposed method, the closed form mean square error (MSE) expression is also derived. Finally, a computer simulation is carried out to compare the performance of the proposed LMMSE method with the classical LS and LMMSE methods in terms of bit error rate (BER) and computational complexity. Results of the simulation show that the proposed LMMSE method achieves exactly the same performance as the conventional LMMSE method, with much lower computational complexity.

Słowa kluczowe

EN

channel estimation; LMMSE; mean square error; OFDM

• Wydawca: Instytut Łączności - Państwowy Instytut Badawczy
• Czasopismo: Journal of Telecommunications and Information Technology
• Rocznik: 2022
• Tom: nr 1
• Strony: 72--78
• Opis fizyczny: Bibliogr. 26 poz., rys., tab.

Twórcy

autor

Patra Jyoti P.

• Madanapalle Institute of Technology and Science, Madanapalle, Andhra Pradesh, India

• https://orcid.org/0000-0002-6470-2728

autor

Pradhan Bibhuti Bhusan

• Madanapalle Institute of Technology and Science, Madanapalle, Andhra Pradesh, India

• https://orcid.org/0000-0001-6817-7505

autor

Singh Poonam

• National Institute of Technology, Rourkela, Odisha, India

Bibliografia

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