Suppose we want to transmit the message 1011 0010 0100 1011 and protect it fromerrors using the CRC-8 polynomial x8 + x² + x¹ + 1.(a) Use polynomial long division to determine the message that should be trans-mitted.(b) Suppose the leftmost bit of the message is inverted due to noise on the trans-mission link. What is the result of the receiver's CRC calculation? How doesthe receiver know that an error has occurred?

ppose we want to transmit the message 101100100100 1011 and prote rors using the CRC-8 polynomial x8 + x² + x¹ + 1. Use polynomial long division to determine the message that should mitted. Suppose the leftmost bit of the message is inverted due to noise on mission link. What is the result of the receiver's CRC calculation? F the receiver know that an error has occurred?

ppose we want to transmit the message 101100100100 1011 and prote rors using the CRC-8 polynomial x8 + x² + x¹ + 1. Use polynomial long division to determine the message that should mitted. Suppose the leftmost bit of the message is inverted due to noise on mission link. What is the result of the receiver's CRC calculation? F the receiver know that an error has occurred?

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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7. In the proof of the claim that for any n-bit messages, any resulting code C with parity bits satisfying properties (0) and (1) will have minimum distance 3, we use 3 cases: A(r, y) = 1,2 and 3. Select all that are true: a. We don't need the case of A(r, y) = 0 because the code has minimum distance 3. b. We don't need the case of A(r, y) = 0 because we assumed r # y. c. We don't need the case of A(r, y) = 0 because it is taken care of by the other cases. d. We don't need the case of A(r, y) = 0 because the claim doesn't need to be proven for that case. e. We don't need the case of A(r, y) = 4 because the code has minimum distance 3. f. We don't need the case of A(r, y) = 4 because we assumed a # y. g. We don't need the case of A(r, y) = 4 because it is taken care of by the other cases. h. We don't need the case of A(r, y) = 4 because the claim doesn't need to be proven for that case.
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4. Assume a receiver got the message 1001111100 and the polynomial pattern is 1100. Use CRC to find whether this message has an error or not. Show your work.