Title :
Adaptive signal processing in subbands using sigma-delta modulation technique
Author :
Lin, L. ; Aboulnasr, T.
Author_Institution :
Ottawa-Carleton Inst. of Electr. Eng., Ottawa Univ., Ont., Canada
Abstract :
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
Keywords :
FIR filters; adaptive filters; adaptive signal processing; computational complexity; convergence; error analysis; interference suppression; sigma-delta modulation; adaptive filter; adaptive interference/noise cancellation system; adaptive signal processing; computer simulations; convergence speed; filter bank; hardware complexity reduction; modulated signal; oversampling rate; sigma-delta modulation technique; steady-state error; subbands; system performance; Adaptive filters; Adaptive signal processing; Computer simulation; Convergence; Delta-sigma modulation; Filter bank; Interference; Noise cancellation; Signal representations; System performance;
Conference_Titel :
Acoustics, Speech, and Signal Processing, 1994. ICASSP-94., 1994 IEEE International Conference on
Conference_Location :
Adelaide, SA
Print_ISBN :
0-7803-1775-0
DOI :
10.1109/ICASSP.1994.390063
