Publica
Hier finden Sie wissenschaftliche Publikationen aus den FraunhoferInstituten. Interference identification in cellular networks via adaptive projected subgradient methods
 Matthews, M.B. ; Naval Postgraduate School NPS, Monterey/Calif.; IEEE Signal Processing Society: Asilomar Conference on Signals, Systems and Computers 2013. Vol.3 : Pacific Grove, California, USA, 3  6 November 2013 Piscataway, NJ: IEEE, 2013 ISBN: 9781479923915 ISBN: 9781479923908 ISBN: 9781479923885 (Print) pp.19461950 
 Asilomar Conference on Signals, Systems and Computers <47, 2013, Pacific Grove/Calif.> 

 English 
 Conference Paper 
 Fraunhofer HHI () 
Abstract
We develop an adaptive algorithm to estimate a channel gain matrix in cellular heterogeneous networks. This algorithm has the objective of providing important information to interference coordination and management schemes, a crucial functionality of 'beyond 2020 networks'. In more detail, we pose the estimation problem as a settheoretic adaptive filtering problem. In the proposed scheme, the channel gain matrix is tracked with the adaptive projected subgradient method (APSM), a powerful iterative tool that can seamlessly use prior information and information gained by measurements. More precisely, we construct multiple closed convex sets, each of which containing estimates that are consistent with a piece of information about the channel gain matrix. The intersection of these sets corresponds to estimates that are consistent with all available information. In particular, we use the following information to construct the sets: i) physical upper and lower bounds of the path gains, ii) interference bounds for the downlink and uplink communication, and iii) received signal received power (RSRP) measurements. The algorithm produces a sequence of estimates where each term is an estimate that approaches the intersection of the multiple sets available at a given time instant. Simulations show that the proposed algorithm is able to track the channel gain matrix in scenarios with mobile users, and it outperforms standard adaptive filters that do not use prior information.