Multiplierless analog LMS adaptive FIR filters

Huang Qiuting, George S. Moschytz

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

3 Scopus citations


Two adaptive FIR filter configurations are proposed which implement the LMS algorithm with no analog delay elements or multipliers. The first configuration uses a linear feedback shift register (LFSR) to genenrate pseudo-random binary sequences for applications where white noise has been traditionally used. The binary signals are delayed by a shift register and multiplied by on-and-off switching so that the resulting structure is free of the analog delay line and multipliers. For applications where colored inputs must be used, the second adaptive filter configuration uses a Σ-Δ modulator as a front-end for converting the filter's reference input into a binary sequence. It is shown that the filter tends to adapt itself into a lowpass shape to remove the high frequency noise generated by the modulator. Computer simulations show very good performance for such hardware efficient configurations.

Original languageEnglish
Title of host publication1992 IEEE International Symposium on Circuits and Systems, ISCAS 1992
PublisherInstitute of Electrical and Electronics Engineers Inc.
Number of pages4
ISBN (Electronic)0780305930
StatePublished - 1992
Externally publishedYes
Event1992 IEEE International Symposium on Circuits and Systems, ISCAS 1992 - San Diego, United States
Duration: 10 May 199213 May 1992

Publication series

NameProceedings - IEEE International Symposium on Circuits and Systems
ISSN (Print)0271-4310


Conference1992 IEEE International Symposium on Circuits and Systems, ISCAS 1992
Country/TerritoryUnited States
CitySan Diego

Bibliographical note

Publisher Copyright:
© 1992 IEEE.


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