Adaptive signal processing in subbands using sigma-delta modulation technique

TitleAdaptive signal processing in subbands using sigma-delta modulation technique
Publication TypeConference Paper
Year of Publication1994
AuthorsLin, L., and T. Aboulnasr
Conference NameAcoustics, Speech, and Signal Processing, 1994. ICASSP-94., 1994 IEEE International Conference on
PaginationIII/169 -III/172 vol.3
Date Publishedapr.
Keywordsadaptive filter, adaptive filters, adaptive interference/noise cancellation system, adaptive signal processing, computational complexity, computer simulations, convergence, convergence speed, error analysis, filter bank, FIR filters, hardware complexity reduction, interference suppression, modulated signal, oversampling rate, sigma-delta modulation, sigma-delta modulation technique, steady-state error, subbands, system performance

In this paper, a sigma-delta modulated subbanded adaptive interference/noise cancellation system is proposed. The filter bank is fully modulated, and the adaptive filter is partially modulated. Maintaining the modulated signal representation throughout results in considerable savings in complexity. By computer simulations, the system performance is compared to the non-modulated case regarding complexity, convergence speed and steady-state error. The effect of the oversampling rate used in modulation as well as the quality of the demodulator are also considered. The paper concludes by highlighting the tradeoffs between the hardware complexity reduction and the overall system performance


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