Conference proceeding
Distributed beamforming with software-defined radios: Frequency synchronization and digital feedback
2012 IEEE Global Communications Conference (GLOBECOM), pp.4787-4792
12/2012
DOI: 10.1109/GLOCOM.2012.6503876
Abstract
We present an implementation of distributed transmit beamforming using software-defined radios. The transmit nodes synchronize in carrier frequency using a pilot signal sent by a master node, and employ feedback from the receiver to adjust their carrier phases so as to add up coherently at the receiver. Our implementation advances the state of the art for all-wireless distributed beamforming in two important ways. The first is the implementation of extended Kalman filters for frequency synchronization at the slave nodes, which is shown to be effective despite the high local oscillator (LO) offsets typical of software-defined radios, and the low duty cycle of the pilot transmitted by the master node. The second advance is the implementation of the well-known one bit feedback scheme for phase adjustment using digital feedback from the receiver. We present experimental results that show the efficacy of our implementation for frequency synchronization and beamforming.
Details
- Title: Subtitle
- Distributed beamforming with software-defined radios: Frequency synchronization and digital feedback
- Creators
- François Quitin - Electr. & Comput. Eng., Univ. of California, Santa Barbara, Santa Barbara, CA, USAMuhammad Mahboob Ur Rahman - Electr. & Comput. Eng., Univ. of Iowa, Iowa City, IA, USARaghuraman Mudumbai - Electr. & Comput. Eng., Univ. of Iowa, Iowa City, IA, USAUpamanyu Madhow - Electr. & Comput. Eng., Univ. of California, Santa Barbara, Santa Barbara, CA, USA
- Resource Type
- Conference proceeding
- Publication Details
- 2012 IEEE Global Communications Conference (GLOBECOM), pp.4787-4792
- DOI
- 10.1109/GLOCOM.2012.6503876
- ISSN
- 1930-529X
- eISSN
- 2576-764X
- Publisher
- IEEE
- Language
- English
- Date published
- 12/2012
- Academic Unit
- Electrical and Computer Engineering
- Record Identifier
- 9984083836102771
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