ET3220 Week6 - codewords Then for those particular...

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Khalid AL-Baidhani Week6 and HW#6 ET 3220 Unit 6 Assignment 1 CODING AND ERROR CONTROL 8.1 parity bit  appended to an array of binary digits to make the sum of all the binary  digits, including the parity bit, always odd (odd parity) or always even (even parity). 8.2 The  CRC  is an error detecting code in which the code is the remainder resulting from  dividing the bits to be checked by a predetermined binary number. 8.3 The CRC has more bits and therefore provides more redundancy. That is, it provides  more information that can be used to detect errors. 8.4 Modulo 2 arithmetic, polynomials, and digital logic. 8.5  It is possible. May could design a code in which all codewords are at least a distance  of 3 from all other codewords, allowing all single-bit errors to be corrected. Suppose that  some but not all codewords in this code are at least a distance of 5 from all other  codewords. Then for those particular codewords, but not the others, a double bit error 
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Unformatted text preview: codewords. Then for those particular codewords, but not the others, a double bit error could be corrected. 8.6 An ( n , k ) block code encodes k data bits into n-bit codewords. 8.7 An ( n , k , K ) code processes input data k bits at a time and produces an output of n bits for each incoming k bits. The current output of n bits is a function of the last K × k input bits. 8.8 A trellis is a diagram that shows the state transitions over time in a convolutional code. 8.9 Detection of errors and retransmission of frames that are received in error. 8.10 Go-back-N ARQ is a form of error control in which a destination station sends a negative acknowledgment (NAK) when it receives an error. The source station receiving the NAK will retransmit the frame in error plus all succeeding frames transmitted in the interim....
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