|Table of Contents|

Noise variance threshold-based channel estimator for OFDM system with I/Q imbalances

《南京理工大学学报》(自然科学版)[ISSN:1005-9830/CN:32-1397/N]

Issue:
2015年03期
Page:
317-
Research Field:
Publishing date:

Info

Title:
Noise variance threshold-based channel estimator for OFDM system with I/Q imbalances
Author(s):
Xu Yanqing1Wang Jin1Meng Qinggong1Wei Yuan1Shu Feng123 Yu Hai1Shen Yue1Qian Yuwen1
1.School of Electronic Engineering and Optoelectronic Technology,NUST,Nanjing 210094,China; 2.National Mobile Communications Research Laboratory,Southeast University,Nanjing 210096,China; 3.Ministerial Key Laboratory of JGMT,NUST,Nanjing 210094,China
Keywords:
in-phase and quadrature-phase imbalances orthogonal frequency division multiplexing least square channel estimator noise variance sparse environment frequency-domain time-domain compressed sensing
PACS:
TN929.5
DOI:
-
Abstract:
In order to improve the performance of orthogonal frequency division multiplexing(OFDM)system with in-phase and quadrature-phase(I/Q)imbalances in sparse environment,a threshold-based time-domain least square(TB-TD-LS)channel estimator is proposed with low complexity.In order to improve the accuracy of channel estimation,an approximate optimal threshold is determined according to noise variance to eliminate the noise in sampling points of channel response in the proposed estimator.The simulation result shows that the estimation accuracy of the TB-TD-LS channel estimator is improved 6 dB than that of a frequency-domain channel estimation algorithm,and is improved 2 dB than that of a time-domain channel estimation algorithm,and closes to that of a time-domain least square iterative shrinkage estimator based on compressed sensing.The computation complexity of the TB-TD-LS channel estimator is lower than that of the time-domain least square iterative shrinkage estimator based on compressed sensing.

References:

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Last Update: 2015-06-30