Title :
Blind IQ error compensation in a direct conversion receiver for DVB-T
Author :
Palipana, Rajitha Bandara ; Chung, Kah-Seng
Author_Institution :
Dept. of Electr. & Comput. Eng., Curtin Univ. of Technol., Perth, WA, Australia
Abstract :
The paper provides a novel scheme for correcting IQ imbalance in direct-conversion receivers. In the proposed method, IQ imbalance is corrected blindly in the time domain using a complex adaptive signal separator. Also, a frequency domain equalizer is proposed for correcting the complex scaling factor present in the signal after the signal separation. Computer simulations carried out using a baseband IQ error model provide promising results. For example, a direct conversion receiver intended for terrestrial digital video broadcasting (DVB-T) could achieve a BER of 2×10-4 after the Viterbi decoder in the presence of 3 dB gain error and 10° phase error for an SNR value of about 16.5 dB.
Keywords :
Viterbi decoding; adaptive signal processing; digital video broadcasting; equalisers; error statistics; source separation; television receivers; DVB-T; IQ imbalance; SNR; Viterbi decoder; blind IQ error compensation; complex adaptive signal separator; direct conversion receiver; frequency domain equalizer; gain error; phase error; scaling factor; terrestrial digital video broadcasting; Baseband; Bit error rate; Computer errors; Computer simulation; Digital video broadcasting; Equalizers; Error compensation; Frequency domain analysis; Particle separators; Source separation;
Conference_Titel :
Circuits and Systems, 2005. ISCAS 2005. IEEE International Symposium on
Print_ISBN :
0-7803-8834-8
DOI :
10.1109/ISCAS.2005.1465411
