A Comparison of spatial modulation and spatial multiplexing systems in multipath fading channels


Thesis Type: Postgraduate

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

Approval Date: 2013

Thesis Language: English

Student: Halil Saygılı

Supervisor: ALİ ÖZGÜR YILMAZ

Abstract:

In this thesis, multiple antenna transmission techniques like spatial multiplexing, spatial modulation and multiple active spatial modulation are compared in multipath fading channels. Maximum likelihood sequence estimation (MLSE) based on the Ungerboeck observation model is the optimal operation for intersymbol interference channels and applied on the mentioned multiple antenna transmission strategies. The performance analysis based on Monte Carlo simulations and comparison of the computational complexity of the studied receiver structures showed us that spatial modulation has the lowest complexity and it can be an alternative to classical spatial multiplexing systems for low spectral e ciencies. But performance of spatial modulation starts to deteriorate for higher spectral e ciencies. In this case, multiple active spatial modulation is still a low complexity alternative for spatial multiplexing. Delayed decision feedback sequence estimation (DDFSE) based on the Ungerboeck model which is a suboptimal reduced state detection algorithm is also applied to these multiple antenna techniques. The performance analysis based on Monte Carlo simulations reveals that error propagation in DDFSE exacerbates the performance di erence between spatial multiplexing and modulation.