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.

Analysis of the effect of the I/Q base-band filter mismatch in an OFDM modem / DI BENEDETTO, Maria Gabriella; P., Mandarini. - In: WIRELESS PERSONAL COMMUNICATIONS. - ISSN 0929-6212. - STAMPA. - 12-2:(1999), pp. 175-186. [10.1023/A:1008842314148]

Analysis of the effect of the I/Q base-band filter mismatch in an OFDM modem

DI BENEDETTO, Maria Gabriella;
1999

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.
1999
01 Pubblicazione su rivista::01a Articolo in rivista
Analysis of the effect of the I/Q base-band filter mismatch in an OFDM modem / DI BENEDETTO, Maria Gabriella; P., Mandarini. - In: WIRELESS PERSONAL COMMUNICATIONS. - ISSN 0929-6212. - STAMPA. - 12-2:(1999), pp. 175-186. [10.1023/A:1008842314148]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/13084
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