Adaptive compensation of nonlinear distortion in multicarrier direct-conversion receivers

• Main Authors: Shahed hagh ghadam, A., Valkama, M., Renfors, M.
• Format: Conference Proceeding
• Language: English
• Subjects: Applied sciences; Broadband amplifiers; Detection, estimation, filtering, equalization, prediction; Digital communication; Exact sciences and technology; Frequency; Information, signal and communications theory; Interference cancellation; Intermodulation distortion; Miscellaneous; Nonlinear distortion; Power harmonic filters; Quadrature amplitude modulation; Receivers; Signal and communications theory; Signal processing; Signal, noise; Telecommunications and information theory; Wideband
• DOI: 10.1109/RAWCON.2004.1389064

In this paper, some novel methods for compensating the effects of receiver front-end nonlinearities are introduced. More specifically, we focus on multicarrier or multichannel direct-conversion type receivers where several frequency channels are I/Q downconverted as a whole, with the dynamic range of the wideband signal being considerably high. In this kind of receiver, the harmonic and intermodulation distortion due to strong blocking signals is an obvious limiting factor to the whole receiver performance. The basic idea in This work is to remove or reduce this type of distortion effect from a specific channel of interest using adaptive interference cancellation combined with proper reference signal generation. The effectiveness of the proposed solutions is illustrated through computer simulations, and some example results are also presented based on measured receiver front-end signals.