Opportunistic collaborative beamforming with one-bit feedback
IEEE Transactions on Wireless Communications
Distributed transmit beamforming: challenges and recent progress
IEEE Communications Magazine
Collaborative null-steering beamforming for uniformly distributed wireless sensor networks
IEEE Transactions on Signal Processing
IEEE Transactions on Signal Processing
Target localization accuracy gain in MIMO radar-based systems
IEEE Transactions on Information Theory
Sidelobe control in collaborative beamforming via node selection
IEEE Transactions on Signal Processing
Distributed transmit beamforming without phase feedback
EURASIP Journal on Wireless Communications and Networking - Special issue on theoretical and algorithmic foundations of wireless ad hoc and sensor networks
Efficient Radio Transmission with Adaptive and Distributed Beamforming for Intelligent WiMAX
Wireless Personal Communications: An International Journal
Fully wireless implementation of distributed beamforming on a software-defined radio platform
Proceedings of the 11th international conference on Information Processing in Sensor Networks
Wireless Communications & Mobile Computing
Synchronization Analysis for Wireless TWRC Operated with Physical-layer Network Coding
Wireless Personal Communications: An International Journal
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Transmit beamforming is an energy-efficient wireless communication technique that allows a transmitter with two or more antennas to focus its bandpass signal in an intended direction. The idea of transmit beamforming has been extended to networks of single-antenna cooperative transmitters that pool their antenna resources and behave as a ldquodistributed beamformer.rdquo Unlike conventional transmit beamforming, however, the carriers of the single-antenna transmitters in a distributed beamformer are each synthesized from independent and imperfect local oscillators; carrier phase and frequency synchronization among the transmitters is necessary to ensure that a beam is aimed in the desired direction. In this paper, a new time-slotted round-trip carrier synchronization protocol is proposed to enable distributed beamforming in multiuser wireless communication systems. Numerical results for a distributed beamformer with two transmitters show that the parameters of the round-trip synchronization protocol can be selected such that a desired level of phase accuracy and reliability is achieved during beamforming and such that the synchronization overhead is small with respect to the amount of time that reliable beamforming is achieved. The impact of mobility on the performance of the round-trip carrier synchronization protocol is also shown to be small when the synchronization timeslots are short.