TY - GEN
T1 - A robust normalized variable tap-length normalized fractional LMS algorithm
AU - Akhtar, Muhammad Tahir
AU - Ahmed, Shakeel
PY - 2017/3/2
Y1 - 2017/3/2
N2 - In system identification, the selection of the optimum taplength of an adaptive filter is desirable to balance the conflicting requirements of computational cost and the steady-state performance. The performance of the original fractional tap-length least-mean-square LMS (FT-LMS) algorithm is severely degraded with a change in the variance of the input excitation signal, as well as with a change in the variance of the tap-coefficients of the unknown system. In this paper, a normalized LMS style variable tap-length (VTL) algorithm is proposed. The main idea is to efficiently normalize the step-size in the update equation for the tap-length. Furthermore, the idea of fractional gradient is incorporated with the weight-update equation of the adaptive filter. Extensive computer simulations are carried out, which demonstrate that the proposed algorithm gives robust performance in the time-varying environment.
AB - In system identification, the selection of the optimum taplength of an adaptive filter is desirable to balance the conflicting requirements of computational cost and the steady-state performance. The performance of the original fractional tap-length least-mean-square LMS (FT-LMS) algorithm is severely degraded with a change in the variance of the input excitation signal, as well as with a change in the variance of the tap-coefficients of the unknown system. In this paper, a normalized LMS style variable tap-length (VTL) algorithm is proposed. The main idea is to efficiently normalize the step-size in the update equation for the tap-length. Furthermore, the idea of fractional gradient is incorporated with the weight-update equation of the adaptive filter. Extensive computer simulations are carried out, which demonstrate that the proposed algorithm gives robust performance in the time-varying environment.
UR - http://www.scopus.com/inward/record.url?scp=85015977429&partnerID=8YFLogxK
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U2 - 10.1109/MWSCAS.2016.7870146
DO - 10.1109/MWSCAS.2016.7870146
M3 - Conference contribution
AN - SCOPUS:85015977429
SN - 9781509009169
T3 - Midwest Symposium on Circuits and Systems
BT - 2016 IEEE 59th International Midwest Symposium on Circuits and Systems, MWSCAS 2016
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 59th IEEE International Midwest Symposium on Circuits and Systems, MWSCAS 2016
Y2 - 16 October 2016 through 19 October 2016
ER -