Development of a smart-antenna test-bed, demonstrating software defined digital beamforming


Kluwer, T. and Slump, C.H. and Schiphorst, R. and Hoeksema, F.W. (2001) Development of a smart-antenna test-bed, demonstrating software defined digital beamforming. In: Proceedings of the 12th Annual Workshop on Circuits, Systems and Signal Processing, 28-30 Nov 2001, Veldhoven, Netherlands (pp. pp. 459-465).

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Abstract:This paper describes a smart-antenna test-bed consisting of ‘common of the shelf’ (COTS) hardware and software defined radio components. The use of software radio components enables a flexible platform to implement and test mobile communication systems as a real-world system. The test-bed is configured to demonstrate the concept of a smart antenna receiver using digital beamforming.

The system consists of high-speed analog to digital converters (ADC), a digital signal processor (DSP) and a real-time operating system, combined with radio algorithms in software. Programmable signal generators generate signals at intermediate frequencies (IF), which are sampled by the ADCs. The sampled IF signal is transferred efficiently to the DSP where a software defined digital downconverter translates the signal to the baseband.

To demonstrate the test-bed for smart antennas a Constant Modulus (CM) algorithm is implemented. This algorithm recursively computes and updates the weight factors for the signals arriving at different antennas. The resulting optimal weight vector forms a spatial filter that can remove interfering signals arriving at an angle different from the desired signal.
Item Type:Conference or Workshop Item
Electrical Engineering, Mathematics and Computer Science (EEMCS)
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