Common use of Channel Model Clause in Contracts

Channel Model. The channel model has three terminals — a sender, a The equivalence can be established by noting that the modified channel preserves the same knowledge of the side information sequences as the original problem, the rate and equivocation terms only depend on the joint distribution p(y¯n, y¯n, xn, sn) receiver and an eavesdropper. The sender communicates with and for any input distribution n n r e t the other two terminals over a discrete-memoryless-channel controlled by a random state parameter. The transition proba- bility of the channel is pyr,ye|x,s (·) where x denotes the channel satisfies p(y¯n, y¯n|xn, sn) = p(x |st ), the extended channel Yn p(y¯ri, y¯ei|xi, sti), (6) input symbol, whereas yr and ye denote the channel output r e t i=1 symbols at the receiver and the eavesdropper respectively. The symbol s denotes a state variable that controls the channel transition probability. We assume that it is independent and · identically distributed (i.i.d.) from a distribution ps ( ) in each channel use. Further, the entire sequence sn is known to the sender before the communication begins. As explained in section II-C the model generalizes easily to take into account correlated side information sequence at each of the receivers.