Suppression of CW Interference and Colored Noise in QPSK System Using Decision-Feedback Filters
Summary :
In this paper, we consider the performance of QPSK systems using complex transversal filters with additional decision-feedback (DF) taps, in the presence of colored noise and single continuous wave (CW) interference. Both one-sided and two-sided transversal filters with DF are considered. The general analytic expressions for the optimum tap weights and minimum mean square errors are obtained. We calculate the output signal-to-noise ratio of the filters and compare the theoretical results with the computer simulated results. The relations between the spectrum of the colored noise as well as CW interference and the corresponding frequency response of the DF filters are considered. We also consider the transient behavior of the adaptive DF filters. It is shown that the DF filters can suppress not only CW interference but also colored noise and that the two-sided transversal filter with DF has best performance in the presence of the colored noise and CW interference, while the one-sided transversal filter with DF is preferred when the white Gaussian noise and CW interference are included in the system. It is also shown that the frequency response of the DF filters is changed according to the spectrum distribution of the colored noise and CW interference in order to suppress them more effectively. The simulated results are in good agreement with the theoretical results.
- Publication
- IEICE TRANSACTIONS on transactions Vol.E72-E No.7 pp.804-810
- Publication Date
- 1989/07/25
- Publicized
- Online ISSN
- DOI
- Type of Manuscript
- PAPER
- Category
- Digital Signal Processing
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Toshiaki OGAWA, Iwao SASASE, Shinsaku MORI, "Suppression of CW Interference and Colored Noise in QPSK System Using Decision-Feedback Filters" in IEICE TRANSACTIONS on transactions,
vol. E72-E, no. 7, pp. 804-810, July 1989, doi: .
Abstract: In this paper, we consider the performance of QPSK systems using complex transversal filters with additional decision-feedback (DF) taps, in the presence of colored noise and single continuous wave (CW) interference. Both one-sided and two-sided transversal filters with DF are considered. The general analytic expressions for the optimum tap weights and minimum mean square errors are obtained. We calculate the output signal-to-noise ratio of the filters and compare the theoretical results with the computer simulated results. The relations between the spectrum of the colored noise as well as CW interference and the corresponding frequency response of the DF filters are considered. We also consider the transient behavior of the adaptive DF filters. It is shown that the DF filters can suppress not only CW interference but also colored noise and that the two-sided transversal filter with DF has best performance in the presence of the colored noise and CW interference, while the one-sided transversal filter with DF is preferred when the white Gaussian noise and CW interference are included in the system. It is also shown that the frequency response of the DF filters is changed according to the spectrum distribution of the colored noise and CW interference in order to suppress them more effectively. The simulated results are in good agreement with the theoretical results.
URL: https://global.ieice.org/en_transactions/transactions/10.1587/e72-e_7_804/_p
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@ARTICLE{e72-e_7_804,
author={Toshiaki OGAWA, Iwao SASASE, Shinsaku MORI, },
journal={IEICE TRANSACTIONS on transactions},
title={Suppression of CW Interference and Colored Noise in QPSK System Using Decision-Feedback Filters},
year={1989},
volume={E72-E},
number={7},
pages={804-810},
abstract={In this paper, we consider the performance of QPSK systems using complex transversal filters with additional decision-feedback (DF) taps, in the presence of colored noise and single continuous wave (CW) interference. Both one-sided and two-sided transversal filters with DF are considered. The general analytic expressions for the optimum tap weights and minimum mean square errors are obtained. We calculate the output signal-to-noise ratio of the filters and compare the theoretical results with the computer simulated results. The relations between the spectrum of the colored noise as well as CW interference and the corresponding frequency response of the DF filters are considered. We also consider the transient behavior of the adaptive DF filters. It is shown that the DF filters can suppress not only CW interference but also colored noise and that the two-sided transversal filter with DF has best performance in the presence of the colored noise and CW interference, while the one-sided transversal filter with DF is preferred when the white Gaussian noise and CW interference are included in the system. It is also shown that the frequency response of the DF filters is changed according to the spectrum distribution of the colored noise and CW interference in order to suppress them more effectively. The simulated results are in good agreement with the theoretical results.},
keywords={},
doi={},
ISSN={},
month={July},}
Copy
TY - JOUR
TI - Suppression of CW Interference and Colored Noise in QPSK System Using Decision-Feedback Filters
T2 - IEICE TRANSACTIONS on transactions
SP - 804
EP - 810
AU - Toshiaki OGAWA
AU - Iwao SASASE
AU - Shinsaku MORI
PY - 1989
DO -
JO - IEICE TRANSACTIONS on transactions
SN -
VL - E72-E
IS - 7
JA - IEICE TRANSACTIONS on transactions
Y1 - July 1989
AB - In this paper, we consider the performance of QPSK systems using complex transversal filters with additional decision-feedback (DF) taps, in the presence of colored noise and single continuous wave (CW) interference. Both one-sided and two-sided transversal filters with DF are considered. The general analytic expressions for the optimum tap weights and minimum mean square errors are obtained. We calculate the output signal-to-noise ratio of the filters and compare the theoretical results with the computer simulated results. The relations between the spectrum of the colored noise as well as CW interference and the corresponding frequency response of the DF filters are considered. We also consider the transient behavior of the adaptive DF filters. It is shown that the DF filters can suppress not only CW interference but also colored noise and that the two-sided transversal filter with DF has best performance in the presence of the colored noise and CW interference, while the one-sided transversal filter with DF is preferred when the white Gaussian noise and CW interference are included in the system. It is also shown that the frequency response of the DF filters is changed according to the spectrum distribution of the colored noise and CW interference in order to suppress them more effectively. The simulated results are in good agreement with the theoretical results.
ER -
English
