Analysis of the Effect of the I/Q Base-Band Filter Mismatch in an OFDM Modem |
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Authors: | Di Benedetto Maria-Gabriella Mandarini Paolo |
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Affiliation: | (1) Dipartimento INFOCOM, Università degli Studi di Roma La Sapienza , via Eudossiana, 18, 00184 Rome, Italy |
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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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Keywords: | modulation OFDM analog filters |
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