New adaptive complex IIR filters and their application in OFDM systems (original) (raw)
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2002
Quadrature zero-if transceivers suffer from the imbalance of the I and Q paths. By using a complex low-pass filter topology instead of a conventional pair of real low-pass filters, this imperfection can be reduced. Both analytical and numerical analysis show that the proposed technique is significantly more robust to circuit imperfections than the traditional architecture.
New first- and second-order very low sensitivity bandpass/bandstop complex digital filter sections
TENCON, IEEE Region 10 International Conference, 1997
Very low magnitude sensitivity first- and second-order bandpass and bandstop complex coefficient orthogonal digital filter structures are derived by developing appropriate prototype sections and applying on them a circuit transformation. The bandstop and the multioutput universal orthogonal sections are proposed for first time. Then, a comparative study together with other known structures is conducted and it is shown that while
Very Low Sensitivity Complex Coefficients Band-Pass Filter Sections
After development and proper selection and investigation of different prototype low-pass sections, very low magnitude sensitivity first-and second-order complex coefficient orthogonal digital filter structures are derived. Then, a comparative study together with other known structures is conducted and it is shown that, by having canonic (minimum) number of multipliers and delay elements, the new structures employ more than two times (for first-order) and more than three times (for second-order) less elements, ensuring in the same time tens or hundreds of times lower sensitivity for narrow-band realizations. It is demonstrated experimentally that the new structures are preserving their magnitude responses even when the coefficient word-length is reduced to 2 bits of canonic SD-code, while the response of the other known structures are totally destroyed even with 3 bits word-length. The new structures are suitable for realization of high quality narrow-band orthogonal filters of highe...