Real-Time Signal Processing for Multiantenna Systems: Algorithms, Optimization, and Implementation on an Experimental Te
- PDF / 1,821,670 Bytes
- 21 Pages / 600.03 x 792 pts Page_size
- 56 Downloads / 169 Views
Real-Time Signal Processing for Multiantenna Systems: Algorithms, Optimization, and Implementation on an Experimental Test-Bed ¨ ¨ Thomas Haustein, Andreas Forck, Holger Gabler, Volker Jungnickel, and Stefan Schiffermuller Fraunhofer Institute for Telecommunications, Heinrich-Hertz-Institut, Einsteinufer 37, 10587 Berlin, Germany Received 1 December 2004; Revised 18 July 2005; Accepted 22 July 2005 A recently realized concept of a reconfigurable hardware test-bed suitable for real-time mobile communication with multiple antennas is presented in this paper. We discuss the reasons and prerequisites for real-time capable MIMO transmission systems which may allow channel adaptive transmission to increase link stability and data throughput. We describe a concept of an efficient implementation of MIMO signal processing using FPGAs and DSPs. We focus on some basic linear and nonlinear MIMO detection and precoding algorithms and their optimization for a DSP target, and a few principal steps for computational performance enhancement are outlined. An experimental verification of several real-time MIMO transmission schemes at high data rates in a typical office scenario is presented and results on the achieved BER and throughput performance are given. The different transmission schemes used either channel state information at both sides of the link or at one side only (transmitter or receiver). Spectral efficiencies of more than 20 bits/s/Hz and a throughput of more than 150 Mbps were shown with a single-carrier transmission. The experimental results clearly show the feasibility of real-time high data rate MIMO techniques with state-of-the-art hardware and that more sophisticated baseband signal processing will be an essential part of future communication systems. A discussion on implementation challenges towards future wireless communication systems supporting higher data rates (1 Gbps and beyond) or high mobility concludes the paper. Copyright © 2006 Hindawi Publishing Corporation. All rights reserved.
1.
INTRODUCTION
1.1. Motivation The widespread use of wireless and mobile communication devices has changed everyday life during the recent decade. The introduction of cellular networks laid the foundation for mobile communication almost everywhere, anytime, and with everyone. A growing use of data communication mainly over the internet, for example, email, news, or information of any kind, produces an increasing demand in wireless data traffic as well. Since wireless connections are generally not exclusive point-to-point connections as land lines used, for example, for telephone and DSL, the available frequency spectrum has to be shared with other users and radio systems. The high expectations towards the growth of mobile communications made the available spectrum valuable and expensive for licensing. Therefore, it is a prerequisite for all service providers and radio systems to exploit the limited resource frequency spectrum very efficiently. A new transmission concept proposed by Foschini [1] using multiple antennas at each side of
Data Loading...
