The training sequence code dependence of EDGE receivers using zero IF sampling

Abstract-In the mobile communication standard GSM/EDGE, the base station can select one of eight training sequence codes as the midamble of the downlink transmitted bursts. If the receiving mobile station uses zero intermediate frequency sampling, the channel estimation is sensitive to the DC offset and IQ gain/phase imbalance of the RF transceiver. This letter shows for a common class of channel estimators that the sensitivity depends on the selected training sequence code. This sensitivity can become significant for 8PSK modulation.

[1]  James K. Cavers,et al.  Adaptive compensation for imbalance and offset losses in direct conversion transceivers , 1993 .

[2]  Bengt Lindoff,et al.  Enhanced DC estimation via sequence-specific frequency offset , 2002, Proceedings IEEE 56th Vehicular Technology Conference.

[3]  Robert Schober,et al.  Equalization concepts for EDGE , 2002, IEEE Trans. Wirel. Commun..

[4]  Bengt Lindoff Using a direct conversion receiver in EDGE terminals-a new DC offset compensation algorithm , 2000, 11th IEEE International Symposium on Personal Indoor and Mobile Radio Communications. PIMRC 2000. Proceedings (Cat. No.00TH8525).

[5]  Bengt Lindoff,et al.  BER performance analysis of a direct conversion receiver , 2002, IEEE Trans. Commun..

[6]  Yong Hoon Lee,et al.  Joint ML estimation of carrier frequency, channel, I/Q mismatch, and DC offset in communication receivers , 2005, IEEE Transactions on Vehicular Technology.