Fixed Income "Snow Ball" & "Tarn"

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Fixed Income "Snow Ball" & "Tarn"

Marco Ottolino
Hi, I'm new on Quantlib. I need to price and compute sensitivity for fixed income structures like "Snowball" and Tarn. In particular I'm interested in pricing bond with coupons like this:
 
previous coupon + X fixed rate - Euribor 6m  
or:
Euribor 6m if Euribor 6m > X fixed rate otherwise 0  -----> but if sum of coupon = Yfixed, bond redeems.
 
Which kind of model could I use? I think probably an LFM -LSM model (using Brigo Mercurio notation)
I'm looking for Quantlib code to price them, could someone help me?
 
marco Ottolino