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Analysis of the Effect of the I/Q Base-Band Filter Mismatch in an OFDM Modem

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Abstract

In digital communication modems in which a very high rate system clock is used, it is necessary to use analog base-band shaping filters in the inphase (I) and quadrature (Q) paths of the modulator. However, this type of implementation inherently produces a mismatch of the I and Q paths. In the present paper, results of the analysis of the transmitter (TX) I/Q mismatch in an Orthogonal Frequency Division Multiplexing (OFDM) system with Differential Coherent Quadrature Phase Shift Keying (DQPSK) modulation is presented. Theoretical analysis shows that the Signal-to-Noise (SNR) degradation due to the I/Q mismatch can be represented by a mismatch transfer function on the basis of which one can compute the maximum affordable amplitude and phase mismatch of the TX filters transfer functions.

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Authors and Affiliations

  1. Dipartimento INFOCOM, Università degli Studi di Roma “La Sapienza”, via Eudossiana, 18, 00184, Rome, Italy

    Maria-Gabriella Di Benedetto & Paolo Mandarini

Authors
  1. Maria-Gabriella Di Benedetto
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  2. Paolo Mandarini
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Di Benedetto, MG., Mandarini, P. Analysis of the Effect of the I/Q Base-Band Filter Mismatch in an OFDM Modem. Wireless Personal Communications 12, 175–186 (2000). https://doi.org/10.1023/A:1008842314148

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  • DOI: https://doi.org/10.1023/A:1008842314148

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