Title :
Robust adaptive channel estimation of OFDM systems in time-varying narrowband interference
Author :
Zhang, Zhiguo ; Chan, Shing-Chow ; Cheng, Hui
Author_Institution :
Dept. of Electr. & Electron. Eng., Hong Kong Univ., China
Abstract :
The paper presents an adaptive channel estimation algorithm for orthogonal frequency division multiplexing (OFDM) systems in the presence of narrowband interference (NBI). The performance of the conventional linear minimum mean square error (MMSE) estimator degrades significantly in the presence of the narrowband interference. A new weighted recursive least M-estimate (RLM) algorithm is adopted for suppressing the adverse effect of time-varying narrowband interference to OFDM systems. Simulation results demonstrate the improved robustness of the proposed algorithm.
Keywords :
OFDM modulation; adaptive estimation; channel estimation; interference suppression; least mean squares methods; radiofrequency interference; recursive estimation; OFDM systems; adaptive channel estimation; adaptive estimation; linear MMSE estimator; linear minimum mean square error estimator; orthogonal frequency division multiplexing; recursive estimation; recursive least M-estimate algorithm; robustness; time-varying narrowband interference suppression; Channel estimation; DSL; Data communication; Degradation; Interference; Mean square error methods; Narrowband; OFDM; Robustness; Time varying systems;
Conference_Titel :
Circuits and Systems, 2005. ISCAS 2005. IEEE International Symposium on
Print_ISBN :
0-7803-8834-8
DOI :
10.1109/ISCAS.2005.1464939
