A Novel Adaptive Calibration Scheme for Frequency-Selective I/Q Imbalance in Broadband Direct-Conversion Transmitters

作者：Luo Jian^*; Kortke Andreas; Keusgen Wilhelm; Valkama Mikko

来源：IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS, 2013, 60(2): 61-65.

DOI：10.1109/TCSII.2012.2235735

• Digital precompensation
• direct-conversion architecture
• dirty RF
• frequency-selective I/Q imbalance
• multiband (MB)
• multistandard
• parameter tracking
• time variant

This brief proposes a novel adaptive calibration scheme for frequency-selective I/Q imbalance in broadband direct-conversion transmitters (Tx) with multiband multistandard capability. The calibration consists of pilot-based initial calibration, followed by pilot-free parameter tracking against time-variant characteristics. Compared to the state-of-the-art (SoA) schemes, the proposed scheme has much lower complexity. Furthermore, the pilot-free tracking can provide good performance independently from the communication signal characteristic and avoids the ill-conditioned matrix problem in the SoA schemes. Its performance is verified by both computer simulations and hardware-in-the-loop experiments.

• 出版日期2013-2