Rejection of Multiple CW Interference in QPSK Systems Using Decision-Feedback Filters

Iwao SASASE; Shinsaku MORI

Rejection of Multiple CW Interference in QPSK Systems Using Decision-Feedback Filters

Iwao SASASE, Shinsaku MORI

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We analyze the performance of QPSK systems using complex transversal filters with decision-feedback (DF) taps in the presence of multiple continuous wave (CW) interference and Gaussian noise. The general analytic expressions for the optimum tap weights and minimum mean square errors in the presence of multiple CW interference for both one-sided and two-sided transversal filters with and without DF taps are derived. We find that the output signal-to-noise ratio (SNR) of the one-sided DF filter is most improved among the four types of the filter structures and that multiple CW interference can be almost completely rejected. We also consider the transient behavior of the DF filters in the presence of multiple CW interference. It is found that the magnitudes of the tap weights are proportional to the relative multiple interference power ratios, while they converge to their corresponding steady-state values with the equal rate. It is also found that one-sided DF filter has shorter setting time compared to two-sided DF filter.

Publication: IEICE TRANSACTIONS on transactions Vol.E71-E No.12 pp.1282-1290

Publication Date: 1988/12/25

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Type of Manuscript: PAPER

Category: Radio Communication

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Iwao SASASE
Shinsaku MORI

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Iwao SASASE, Shinsaku MORI, "Rejection of Multiple CW Interference in QPSK Systems Using Decision-Feedback Filters" in IEICE TRANSACTIONS on transactions, vol. E71-E, no. 12, pp. 1282-1290, December 1988, doi: .
Abstract: We analyze the performance of QPSK systems using complex transversal filters with decision-feedback (DF) taps in the presence of multiple continuous wave (CW) interference and Gaussian noise. The general analytic expressions for the optimum tap weights and minimum mean square errors in the presence of multiple CW interference for both one-sided and two-sided transversal filters with and without DF taps are derived. We find that the output signal-to-noise ratio (SNR) of the one-sided DF filter is most improved among the four types of the filter structures and that multiple CW interference can be almost completely rejected. We also consider the transient behavior of the DF filters in the presence of multiple CW interference. It is found that the magnitudes of the tap weights are proportional to the relative multiple interference power ratios, while they converge to their corresponding steady-state values with the equal rate. It is also found that one-sided DF filter has shorter setting time compared to two-sided DF filter.
URL: https://global.ieice.org/en_transactions/transactions/10.1587/e71-e_12_1282/_p

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@ARTICLE{e71-e_12_1282,
author={Iwao SASASE, Shinsaku MORI, },
journal={IEICE TRANSACTIONS on transactions},
title={Rejection of Multiple CW Interference in QPSK Systems Using Decision-Feedback Filters},
year={1988},
volume={E71-E},
number={12},
pages={1282-1290},
abstract={We analyze the performance of QPSK systems using complex transversal filters with decision-feedback (DF) taps in the presence of multiple continuous wave (CW) interference and Gaussian noise. The general analytic expressions for the optimum tap weights and minimum mean square errors in the presence of multiple CW interference for both one-sided and two-sided transversal filters with and without DF taps are derived. We find that the output signal-to-noise ratio (SNR) of the one-sided DF filter is most improved among the four types of the filter structures and that multiple CW interference can be almost completely rejected. We also consider the transient behavior of the DF filters in the presence of multiple CW interference. It is found that the magnitudes of the tap weights are proportional to the relative multiple interference power ratios, while they converge to their corresponding steady-state values with the equal rate. It is also found that one-sided DF filter has shorter setting time compared to two-sided DF filter.},
keywords={},
doi={},
ISSN={},
month={December},}

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TY - JOUR
TI - Rejection of Multiple CW Interference in QPSK Systems Using Decision-Feedback Filters
T2 - IEICE TRANSACTIONS on transactions
SP - 1282
EP - 1290
AU - Iwao SASASE
AU - Shinsaku MORI
PY - 1988
DO -
JO - IEICE TRANSACTIONS on transactions
SN -
VL - E71-E
IS - 12
JA - IEICE TRANSACTIONS on transactions
Y1 - December 1988
AB - We analyze the performance of QPSK systems using complex transversal filters with decision-feedback (DF) taps in the presence of multiple continuous wave (CW) interference and Gaussian noise. The general analytic expressions for the optimum tap weights and minimum mean square errors in the presence of multiple CW interference for both one-sided and two-sided transversal filters with and without DF taps are derived. We find that the output signal-to-noise ratio (SNR) of the one-sided DF filter is most improved among the four types of the filter structures and that multiple CW interference can be almost completely rejected. We also consider the transient behavior of the DF filters in the presence of multiple CW interference. It is found that the magnitudes of the tap weights are proportional to the relative multiple interference power ratios, while they converge to their corresponding steady-state values with the equal rate. It is also found that one-sided DF filter has shorter setting time compared to two-sided DF filter.
ER -