Journal article
A Scalable Feedback Mechanism for Distributed Nullforming With Phase-Only Adaptation
IEEE transactions on signal and information processing over networks, Vol.1(1), pp.58-70
03/2015
DOI: 10.1109/TSIPN.2015.2442921
Abstract
This paper considers a problem of distributed nullforming, in which multiple wireless transmitters steer a null toward a designated receiver by only adjusting their carrier phases. Since each transmitter transmits at full power, the system maximizes "power pooling" gains for cooperative communication or jamming, while simultaneously protecting a designated receiver. Analysis in a noiseless setting shows that, while the received power at the designated receiver, as a function of the transmitted phases, is nonconvex with multiple critical points, all of its local minima are also global minima. This implies that a null can be formed using a distributed, scalable protocol based on gradient descent: each transmitter adapts its phase based only on aggregate feedback broadcast by the receiver (so that feedback overhead does not increase with the number of transmitters), along with an estimate of its own channel gain (which can be obtained, e.g., via reciprocity). Simulations show that the convergence rate actually improves with the number of transmitters, and that the algorithm is robust to noise, substantial channel estimation errors, and oscillator drift.
Details
- Title: Subtitle
- A Scalable Feedback Mechanism for Distributed Nullforming With Phase-Only Adaptation
- Creators
- Amy Kumar - Dept. of Electr. & Comput. Eng., Univ. of Iowa, Iowa City, IA, USARaghuraman Mudumbai - Dept. of Electr. & Comput. Eng., Univ. of Iowa, Iowa City, IA, USASoura Dasgupta - Dept. of Electr. & Comput. Eng., Univ. of Iowa, Iowa City, IA, USAMuhammad Mahboob-Ur Rahman - Sch. of Electr. Eng., KTH, Stockholm, SwedenD. Richard Brown - Dept. of Electr. & Comput. Eng., Worcester Polytehnic Univ., Worcester, MA, USAUpamanyu Madhow - Dept. of Electr. & Comput. Eng., Univ. of California, Santa Barbara, Santa Barbara, CA, USAT. Patrick Bidigare - Raytheon BBN Technol., Arlington, VA, USA
- Resource Type
- Journal article
- Publication Details
- IEEE transactions on signal and information processing over networks, Vol.1(1), pp.58-70
- Publisher
- IEEE
- DOI
- 10.1109/TSIPN.2015.2442921
- ISSN
- 2373-776X
- eISSN
- 2373-776X
- Grant note
- N00014-13-1-0202 / ONR (10.13039/100000006) CCF-0830747; EPS-1101284; ECCS-1150801; CNS-1329657; CCF-1302456; CCF-1302104; CCF-1319458 / U.S. NSF (10.13039/100000001)
- Language
- English
- Date published
- 03/2015
- Academic Unit
- Electrical and Computer Engineering
- Record Identifier
- 9984083205502771
Metrics
12 Record Views