Wednesday, May 29, 2019

FX Forward pricing with correlation between FX and Zero-Cupon


I would like to extend my question about about FX Forward rates in stochastic interest rate setup: FX forward with stochastic interest rates pricing


We consider a FX process Xt=X0exp(t0(rdsrfs)dsσ22t+σW2t) where rd and rf are stochastic processes not independent of the Brownian motion W. The domestic risk-neutral measure is denoted by Qd.


The domestic and foreign bank accounts are βd and βf respectively. The domestic and foreign zero-coupon bond prices of maturity T at time t are respective Bd(t,T) and Bf(t,T).


The domestic bond follows the SDE


dBd(t,T)Bd(t,T)=rdt dt+σ(t,T) dW1t


with deterministic initial conditions Bd(0,T). The drift and volatility functions in the SDEs are all deterministic functions and W1 and W2 are standard Brownian motions such that W1,W2t=ρ dt.


Now consider domestic τ-forward measure Qd,τ dQd,τdQd|Ft=Bd(t,τ)βdtBd(0,τ)=Et(.0σ(s,τ) dW1s)



and the Qτ-Brownian motions W1,τ.:=W1.+.0σ(s,τ) ds


W2,τ.:=W2.+ρ.0σ(s,τ) ds


Question



I would like to calculate the non-deliverable FX forward rate. Since the fixing date tf is such that tf<T, where T is the settlement date, it implies to pass by the calculation following expectation: EQdt[exp(Ttrds ds) Xtf]



I can get to this point


EQdt[exp(Ttrds ds) Xtf]=Bd(t,tf) EQd,tft[Bb(tf,T)Xtf].


From that point I am struggling to get through all the calculations. Is there a smart way to compute the last expectation?




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