Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Blind I/Q Signal Separation-Based Solutions for Receiver Signal Processing | EURASIP Journal on Applied Signal Processing 2005 16 2708-2718 2005 Mikko Valkama et al. Blind I Q Signal Separation-Based Solutions for Receiver Signal Processing Mikko Valkama Institute of Communications Engineering Tampere University of Technology . Box 553 33101 Tampere Finland Email Markku Renfors Institute of Communications Engineering Tampere University of Technology . Box 553 33101 Tampere Finland Email Visa Koivunen Signal Processing Laboratory Helsinki University of Technology . Box 3000 02015 HUT Finland Email Received 5 February 2004 Revised 14 October 2004 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 . 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. 1. INTRODUCTION In order to increase the receiver flexibility while also emphasizing the receiver integrability and other implementation-related aspects the design of radio receivers is no longer dominated by the traditional superheterodyne architecture. Instead alternative receiver structures like the direct-conversion 1 2 and .
