Hi
Mont carlo bases is to solve integral without common numeric methods. In this method some random numbers are generated and averaged to calculate the integral.
But this term (Mont carlo), is mostly used for simulating some random process iteratively and averaging the result. For example to calculate the BER in channel.
monte-carlo method is based on carring out repetitive calculations using a digital computer to estimate a quantity , specially a random variable (e.g. BER probability of a modulation scheme).
according to monte-carlo simulation, to estimate a given BER probability, Pb , the required number of samples ,N, must satisfy the following condition :
N >> 1/Pb .
in simulation of digital comm. systems N>10/Pb is a good choise .