Ultra-Low Complex Blind I/Q-Imbalance Compensation

Description

Direct-conversion transceivers are the predominating architecture in current mobile communication systems. Despite many advantages, this topology suffers from unavoidable mismatches in the analog part, which cause imbalance between the in-phase and quadrature (I/Q) component. In this paper we present a novel fully digital, blind I/Q imbalance compensation algorithm, which features extremely low computational complexity and a high compensation performance for a wide range of input signal types. Different to many state-of-the-art compensation schemes, the approach is not based on a gradient descent optimization and does not require any global feedback. This simplifies the implementation at high data rates and reduces the configuration effort to a minimum. For comparison we examine an existing method of moments based estimator with similar properties for which we also provide detailed insights beyond available literature. For both algorithms we provide a rigorous mathematical analysis, which is supported by simulations with focus on various Long-Term Evolution (LTE) signal types. In addition, hardware architectures, including field-programmable gate array (FPGA) verification, are presented for both algorithms.

Period	29 Aug 2019
Event title	International Symposium on Integrated Circuits and Systems (ISICAS 2019)
Event type	Conference
Location	ItalyShow on map