hi i have my graduation project,and it is about the linear blockcode,so i want t

Question

hi i have my graduation project,and it is about the linear blockcode,so i want to know what is the applications of the linear block code and what is the advanteges and the disadvanteges of it note that i implement my project on the (7,4)code so how i can improve the project in the futear??? hi i have my graduation project,and it is about the linear blockcode,so i want to know what is the applications of the linear block code and what is the advanteges and the disadvanteges of it note that i implement my project on the (7,4)code so how i can improve the project in the futear???

Explanation / Answer

. 1.   Applications that use Linear Block codesare: (1) data that has been digitally recorded to a mediasuch as tape, disc, and solid state memory; (2) digital data thatis transmitted by radio waves to a receiver, e.g., MarsExplorer; and (3) digital data that is transmitted by opticalfiber to a receiver, e.g. Ethernet. 2. The advantage of using Linear Block codes are theability to detect and possibly correct errors in reception causedby noise within the communication channel. The (7,4) codeyou've chosen can detect two bit errors within any given 7-bitsymbol and correct any 7-bit symbol that contains only 1 biterror. 3.   The disadvantage of using Linear Block codesare that all codes result in "overhead" bits to increaseredundancy; in fixed bandwidth systems (radio broadcasting) thismeans that there is a resulting decrease in the amount ofinformation that can be transmitted to the recipient. The(7,4) code you've chosen transmits three "parity" bits (redundancy)for each four bit message (information bits). For example, ifI could only transmit 56 bits I could send 14, 4-bit messageswithout coding, but only 8, 4-bit messages using a (7,4)code. 4.   You might improve the project by using codeswith greater error correction and detection capability, e.g., (9,4)code which can detect and correct any 2-bit error combinationwithin a 9-bit symbol; the increase in overhead, however, mustbe weighed against bandwidth constraints. .

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