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  • Research Article
  • Open Access

Blind I/Q Signal Separation-Based Solutions for Receiver Signal Processing

EURASIP Journal on Advances in Signal Processing20052005:525164

  • Received: 5 February 2004
  • Published:


This paper introduces some novel digital signal processing (DSP)-based approaches to some of the most fundamental tasks of radio receivers, namely, channel equalization, carrier synchronization, and I/Q mismatch compensation. The leading principle is to show that all these problems can be solved blindly (i.e., without training signals) by forcing the I and Q components of the observed data as independent as possible. Blind signal separation (BSS) is then introduced as an efficient tool to carry out these tasks, and simulation examples are used to illustrate the performance of the proposed approaches. The main application area of the presented carrier synchronization and I/Q mismatch compensation techniques is in direct-conversion type receivers, while the proposed channel equalization principles basically apply to any radio architecture.

Keywords and phrases

  • radio communications
  • complex-valued (I/Q) signals and systems
  • I/Q mismatch
  • carrier synchronization and tracking
  • channel equalization
  • blind signal separation

Authors’ Affiliations

Institute of Communications Engineering, Tampere University of Technology, P.O. Box 553, Tampere, 33101, Finland
Signal Processing Laboratory, Helsinki University of Technology, P.O. Box 3000, 02015 HUT, Finland


© Mikko Valkama et al. 2005

This article is published under license to BioMed Central Ltd. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.