Over-the-Air Proof of Concepts
In this chapter we will validate the previously reported concept regarding the capability of transmitting multiple signals (i.e., performing spatial multiplexing) using one RF chain by using the ESPAR antenna that is presented in Chap. 6. The experiments were conducted in the indoor environment of AIT’s B-WiSE Lab, using a 2.6 GHz prototype made of a single active printed dipole coupled to two passive ones and AIT’s MIMO testbed. To the best of our knowledge, this is the first over-the-air experiment of spatial multiplexing with a single RF front-end yet to be demonstrated. The use of this specific ESPAR antenna in a cognitive radio context will also be shown. The ESPAR antenna will be used as a secondary transmitter and based on two different scenarios we will measure the interference it will cause to the primary receiver. Finally, a new printed parasitic antenna array with one active and four parasitic elements aiming for maximum beamforming gain toward one direction will be presented.
KeywordsCognitive Radio Local Oscillator Primary Receiver Baseband Signal Uniform Linear Array
Philippos Tragas is now working as an RF/Wireless Engineer in Broadcom Corporation.
- 4.Trimble Navigation Limited, Thunderbolt GPS Disciplined Clock, GPS Clock for the Wireless Infrastructure, http://www.trimble.com/products/pdf/thunder.pdf. Accessed 19 June 2012
- 5.Innovative Integration, SBC62, http://www.innovative-dsp.com/products.php?product=SBC62. Accessed 25 June 2012
- 6.Innovative Integration, DAC40, http://www.innovative-dsp.com/products.php?product=DAC40. Accessed 26 June 2012
- 7.National Semiconductor, LMX2306/LMX2316/LMX2326 PLLatinum Low Power Frequency Synthesizer for RF Personal Communications LMX2306 - 550 MHz LMX2316 - 1.2 GHz LMX2326 - 2.8 GHz, http://www.ti.com/lit/ds/symlink/lmx2326.pdf. Accessed 02 July 2012
- 10.S. Srinivasa, S. Jafar, The throughput potential of cognitive radio: a theoretical perspective, in Fortieth Asilomar Conference on Signals, Systems and Computers, 2006. ACSSC ’06, Pacific Grove, CA, 29 October 2006–1 November 2006, pp. 221–225Google Scholar
- 11.J. Perruisseau-Carrier, O. Alrabadi, A. Kalis, Implementation of a reconfigurable parasitic antenna for beam-space BPSK transmissions, in Microwave Conference (EuMC), 2010 European, Paris, 28–30 September 2010, pp. 644–647Google Scholar
- 13.Eurecom, The Mobile Communications department at EURECOM, http://www.eurecom.fr/cm/. Accessed 15 June 2012
- 14.The Mobile Communications department at EURECOM, OpenAirInterface, http://www.openairinterface.org/. Accessed 15 June 2012
- 15.O. Gustafsson, K. Amiri, D. Andersson, A. Blad, C. Bonnet, J. Cavallaro, J. Declerck, A. Dejonghe, P. Eliardsson, M. Glasse, A. Hayar, L. Hollevoet, C. Hunter, M. Joshi, F. Kaltenberger, R. Knopp, K. Le, Z. Miljanic, P. Murphy, F. Naessens, N. Nikaein, D. Nussbaum, R. Pacalet, P. Raghavan, A. Sabharwal, O. Sarode, P. Spasojevic, Y. Sun, H. Tullberg, T. Vander Aa, L. Van der Perre, M. Wetterwald, M. Wu, Architectures for cognitive radio testbeds and demonstrators—an overview, in Proceedings of the Fifth International Conference on Cognitive Radio Oriented Wireless Networks Communications. CROWNCOM 2010. Cannes, 9–11 June 2010, pp. 1–6Google Scholar
- 16.Mentor Graphics, IE3D, Electromagnetic (EM) Design & Simulation Software, http://www.mentor.com/electromagnetic-simulation/. Accessed 12 June 2012
- 17.Mathworks, MATLAB, http://www.mathworks.com/. Accessed 12 June 2012