Book chapter
A Scalable Feedback-Based Approach to Distributed Nullforming
Wireless Internet, pp.78-84
Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering, Springer Berlin Heidelberg
2013
DOI: 10.1007/978-3-642-41773-3_9
Abstract
We present a novel approach to the problem of distributed nullforming where a set of transmitters cooperatively transmit a common message signal in such a way that their individual transmissions precisely cancel each other at a designated receiver. Under our approach, each transmitter iteratively makes an adjustment to the phase of its transmitted RF signal, by effectively implementing a gradient descent algorithm to reduce the amplitude of the overall received signal to zero. We show that this gradient search can be implemented in a purely distributed fashion at each transmitter assuming only that each transmitter has an estimate of its own channel gain to the receiver. This is an important advantage of our approach and assures its scalability; in contrast any non-iterative approach to the nullforming problem requires centralized knowledge of the channel gain of every transmitter. We prove analytically that the gradient search algorithm converges to a null at the designated receiver. We also present numerical simulations to illustrate the robustness of this approach.
Details
- Title: Subtitle
- A Scalable Feedback-Based Approach to Distributed Nullforming
- Creators
- Muhammad M Rahman - Department of Electrical & Computer Engineering, University of Iowa, Iowa City, USASoura Dasgupta - Department of Electrical & Computer Engineering, University of Iowa, Iowa City, USARaghuraman Mudumbai - Department of Electrical & Computer Engineering, University of Iowa, Iowa City, USA
- Resource Type
- Book chapter
- Publication Details
- Wireless Internet, pp.78-84
- Publisher
- Springer Berlin Heidelberg; Berlin, Heidelberg
- Series
- Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering
- DOI
- 10.1007/978-3-642-41773-3_9
- eISSN
- 1867-822X
- ISSN
- 1867-8211
- Language
- English
- Date published
- 2013
- Academic Unit
- Electrical and Computer Engineering
- Record Identifier
- 9984083836302771
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