M(M >> 1)bits of user data are to be transmitted in the form of fixed length frames with D bits of data and K bits of overhead each. A channel with bit error probability b is used. A frame is considered to be corrupted if one or more of the consitituent bits are in error. A corrupted frame is to be retransmitted until it's successfully received. Assume the total number of transmittion attempts for for sending frame can be characterized by a geometric destribution a. what is the expected number of bits transmitted? b. what is the optimal frame size if b=0 c. what is the optimal frame size if K=0 d. what is the optimal frame size in general(assuming b(D+K)<< 0) a. (D+K)(1-b)^(D+K) b. D+K c. D(1-b)^D d.不会 因为题目看不太懂,所以想请问一下不知道对不对..@@ --

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