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# Ref1_DataLink - Ref1 Question 1 A(7,4 cyclic code has a...

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[ Ref1 ] Question 1 A (7,4) cyclic code has a generator polynomial x 3 + x + 1. Information bits consisting of 1100 [most significant bit on the left] are to be coded and transmitted. i. Determine the transmitted code word. ii. The transmitted code word is corrupted such that the error cannot be detected. Give an example of a corrupted coded word such that error cannot be detected. Ans: a-i. ____1110 1011 | 1100000 1011 1110 1011 1010 1011 010 remainder Transmitted code word = 1100010 a-ii Transmitted word from (a) 1100010 ------ a Corrupted bit pattern similar to polynomial 1011 -------b Pattern with no error detected 1101001 ------- (a + b) ____1111 1011 | 1101001 1011 1100 1011 1110 1011 1011 1011 remainder = 0 ; error cannot be detected ------------------------------------ Question 2 A long-distance radio link uses a stop-and-wait ARQ strategy with half-duplex transmission and has the following characteristics: Data transmission rate = 5.4 kbps Frame size, n = 896 Information bits per frame, k = 784 Propagation delay, t d = 10 ms

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If processing delays and acknowledgement transmission time can be neglected, determine the throughput : a. in the absence of errors and b.
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