Geodesic
Doubly reflected BSDEs with call protection and their approximation
ESAIM: Probability and Statistics, Tome 18 (2014), pp. 613-641

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We study the numerical approximation of doubly reflected backward stochastic differential equations with intermittent upper barrier (RIBSDEs). These denote reflected BSDEs in which the upper barrier is only active on certain random time intervals. From the point of view of financial interpretation, RIBSDEs arise as pricing equations of game options with constrained callability. In a Markovian set-up we prove a convergence rate for a time-discretization scheme by simulation to an RIBSDE. We also characterize the solution of an RIBSDE as the largest viscosity subsolution of a related system of variational inequalities, and we establish the convergence of a deterministic numerical scheme for that problem. Due to the potentially very high dimension of the system of variational inequalities, this approach is not always practical. We thus subsequently prove a convergence rate for a time-discretisation scheme by simulation to an RIBSDE.

DOI : 10.1051/ps/2013047
Classification : 93E20, 65C99, 60H30
Keywords: reflected BSDEs, variational inequalities, discrete-time approximation, game option, Call protection 
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     author = {Chassagneux, Jean-Fran\c{c}ois and Cr\'epey, St\'ephane},
     title = {Doubly reflected {BSDEs} with call protection and their approximation},
     journal = {ESAIM: Probability and Statistics},
     pages = {613--641},
     publisher = {EDP-Sciences},
     volume = {18},
     year = {2014},
     doi = {10.1051/ps/2013047},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.1051/ps/2013047/}
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Chassagneux, Jean-François; Crépey, Stéphane. Doubly reflected BSDEs with call protection and their approximation. ESAIM: Probability and Statistics, Tome 18 (2014), pp. 613-641. doi: 10.1051/ps/2013047

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