| CPC H04B 17/336 (2015.01) [H04L 5/0012 (2013.01); H04W 74/0816 (2013.01)] | 12 Claims |
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1. A method implemented by computer means for estimating interference on a radiofrequency system using a set of channels, said interference being caused by interferers of an interfering system using a set of I transmission bands, each of said transmission bands extending on a plurality of contiguous channels of said set of channels, wherein the method comprises:
Determining a set Ω of all N possible configurations of occupation or non-occupation of said set of transmission bands, defined as a set of possible vectors Zk=[Z1,k, . . . Zi,k, . . . ZI,k],
Building a matrix A from a stacking of all the possible vectors Zk,
Obtaining measurements X1, . . . , Xk, . . . , XK of occupation of at least a part of said set of channels, at respective time instants k: 0<k≤K, where K defines a given observation time window,
Computing probabilities defined as: ∀k, ∀zj∈Ω, P(Xk|Zk=zj), where P(X|Z) defines a channel transition function, so as to determine, for each transmission band, an estimated activation rate τ, on the basis of said measurements X1, . . . , Xk, . . . , XK, said estimated activation rate τ corresponding to an occupation rate of a transmission band i by an interferer within said given observation time window,
And wherein said probabilities computations iteratively comprise, at each iteration t:
resolving a non-linear optimization problem with a constraint defined so as to:
maximize
 subject to
 where vector τ(t) is a column of activation rates in respective transmission bands i estimated at an iteration index t, and vector θ is a hidden variable,
computing a vector φ=[φ1, . . . , φN] as a hidden variable as:
 and updating the vector of the activation rates for a next iteration index t+1, as
τ(t+1)=Aφ.
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