The influence, digital estimation and compensation of IQ mismatch at both transmitter (TX) and receiver (RX) side of a direct-conversion based multiple antenna OFDM system are presented in this paper. The resulting IQ imbalance can be split into a frequency independent and a frequency selective part. For estimation and compensation a two-step approach is presented, combining a data-aided and decision directed approach. First the frequency independent IQ imbalance is estimated using a preamble and, subsequently, the frequency selective IQ imbalance is removed using adaptive filtering. A numerical performance analysis reveals that the presented approach effectively mitigates the influence of IQ mismatch in OFDM-based space division multiplexing systems experiencing both TX and RX IQ imbalance.
|Title of host publication||Proceedings IEEE International Conference on Communications (ICC 2006), June 11-15, 2006, Istanbul, Turkey|
|Publisher||Institute of Electrical and Electronics Engineers|
|Publication status||Published - 2006|
|Event||2006 IEEE International Conference on Communications (ICC 2006) - Istanbul, Turkey|
Duration: 11 Jun 2006 → 15 Jun 2006
|Conference||2006 IEEE International Conference on Communications (ICC 2006)|
|Abbreviated title||ICC 2006|
|Period||11/06/06 → 15/06/06|
Schenk, T. C. W., Smulders, P. F. M., & Fledderus, E. (2006). Estimation and compensation of frequency selective TX/RX/ IQ imbalance in MIMO OFDM systems. In Proceedings IEEE International Conference on Communications (ICC 2006), June 11-15, 2006, Istanbul, Turkey Institute of Electrical and Electronics Engineers.