scholarly journals Digital predistortion based on frequency domain estimation for OFDM systems with low complexity loop delay compensation

2012 ◽  
Vol 9 (18) ◽  
pp. 1454-1460 ◽  
Author(s):  
Shahabuddin Rahmanian ◽  
Abdolreza Nabavi
Keyword(s):  
Frequency Domain ◽  
Low Complexity ◽  
Digital Predistortion ◽  
Ofdm Systems ◽  
Delay Compensation ◽  
Loop Delay

scholarly journals A Low-Complexity Pilot-Based Frequency-Domain Channel Estimation for ICI Mitigation in OFDM Systems

Electronics ◽  
2021 ◽  
Vol 10 (12) ◽  
pp. 1404
Author(s):  
Francisco J. Martín-Vega ◽  
Gerardo Gómez
Keyword(s):  
Channel Estimation ◽  
Frequency Domain ◽  
Signal To Noise Ratio ◽  
Minimum Mean Square Error ◽  
Estimation Method ◽  
Low Complexity ◽  
High Signal ◽  
Ofdm Systems ◽  
Coupling Matrix ◽  
Pilot Pattern

A low-complexity pilot pattern and a frequency-domain channel estimation method for Inter-Carrier Interference (ICI) mitigation is proposed for Orthogonal Frequency Division Multiple Access (OFDM) systems. The proposed method exploits the band structure of the coupling matrix to perform an ICI-free channel estimation in the frequency domain. This ICI-free estimation relies on some conditions imposed over the pilot pattern that simplify the complexity of channel estimation significantly, since its complexity is the same as classical least squares (LS) channel estimation used in low mobility scenarios. Then, the ICI is removed by using a modified version of Minimum Mean Square Error (MMSE) equalization, which reduces the computational complexity considerably. This modified MMSE equalization relies on the sparse and banded structure of the coupling matrix and on a low complexity variant of the Cholesky decomposition, which is named LDLH factorization. It is shown that the proposed method greatly improves the Bit Error Rate (BER) in the high Signal-to-Noise Ratio (SNR) regime.

A Low-Complexity Sparse Channel Estimation Method for OFDM Systems

2010 ◽  
Vol E93-B (8) ◽  
pp. 2211-2214
Author(s):  
Bin SHENG ◽  
Pengcheng ZHU ◽  
Xiaohu YOU ◽  
Lan CHEN
Keyword(s):  
Channel Estimation ◽  
Estimation Method ◽  
Low Complexity ◽  
Ofdm Systems ◽  
Sparse Channel Estimation ◽  
Sparse Channel

Type-I Digital Ring-Based PLL Using Loop Delay Compensation and ADC-Based Sampling Phase Detector

2019 ◽  
Vol E102.C (7) ◽  
pp. 520-529
Author(s):  
Zule XU ◽  
Anugerah FIRDAUZI ◽  
Masaya MIYAHARA ◽  
Kenichi OKADA ◽  
Akira MATSUZAWA
Keyword(s):  
Phase Detector ◽  
Type I ◽  
Delay Compensation ◽  
Loop Delay

scholarly journals Gradient-Adaptive Spline-Interpolated LUT Methods for Low-Complexity Digital Predistortion

2021 ◽  
Vol 68 (1) ◽  
pp. 336-349
Author(s):  
Pablo Pascual Campo ◽  
Alberto Brihuega ◽  
Lauri Anttila ◽  
Matias Turunen ◽  
Dani Korpi ◽  
...  
Keyword(s):  
Low Complexity ◽  
Digital Predistortion
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