Reducing MIMO detection complexity via hierarchical modulation /


Thesis Type: Postgraduate

Institution Of The Thesis: Middle East Technical University, Faculty of Engineering, Department of Electrical and Electronics Engineering, Turkey

Approval Date: 2014

Thesis Language: English

Student: Yiğit Uğur

Supervisor: ALİ ÖZGÜR YILMAZ

Abstract:

This work considers multiple-inputmultiple-output (MIMO) communication systems using hierarchical modulation. A disadvantage of the maximum-likelihood (ML) MIMO detector is that its computational complexity increases exponentially with the number of transmit antennas. To reduce complexity, we propose a hierarchical modulation scheme to be used in MIMO transmission where base and enhancement layers are incorporated. In the proposed receiver, the base layer is detected first with a minimum mean square error (MMSE) detector which is followed by ML detection of the enhancement layer. Our results indicate that performance close to ML detection can be achieved with the proposed scheme, yet at a significantly lower complexity.