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13 Threads found on Crc Correction
Hi all guys, I am currently working on a very simple communication simulator between sensor nodes operating in 434 MHz ISM band. The communication is rather simple. Nodes use FSK modulation and Manchester encoding. Correctness of the data is proved via crc. Messages are in total 12 bytes long. At the moment I am at the point where I need to calc
Hi, first of all Merry Christmas to you all. And I would like to ask about crc in DS18B20. I made project with a 8051 and DS18B20, however I didn't use crc because it was tricky to understand, how it works. I would like to implement this error correction in my final year project and I am asking for your help. Can you please e
crc is better and more reliable for detecting data integrity. Use a good polynomial. Checksum is more simple and easy, but it unsure. For instante, checksum is unable to detect the lack of "zeros" words. On the other hand, minimum Hamming distance with checksum is 2; with a good crc is always higher. Regards Z P.S.: why put you this post in
I have used the syndtable, it generates the table of syndrome. Now I have a problem in dividing the message by generator to find the syndrome, i have tried to use the tool for crc generator but I still can not get to correct answer, the reminder of VHDL is different than what I get with deconv in MATLAB
I have two questions about error detection and correction: 1) I am under the impression that crc when compared to two dimensional parity check as an error detection mechanism has the advantage that: It can detect errors just like 2D parity check and also in addtion detect errors when the 2D parity check fails to do so for a BLOCK of data.
Hi are crc and checksum equivalent
Use some kind of crc scheme.
hi, As far as i know there is nothing like error detection capabilities of Turbo codes. Convolutional codes which includes turbo codes fall under error correction codes as compared to Cyclic redundancy Check (crc) which falls under error detection codes. the basic difference is self- explainatory. Error detection codes detect the presence of er
I saw several algorithms applying crc. How to know the number of errors occurred, say my original crc received is A and calculated crc is B. And How can crc be applied for error correction provided the number of errors is well below the hamming distance.
if the "packet" protected by crc is short enough, certiainly, correction is possible. Essentially, crc is also line coding, like BCH, RS...
You can combine the crc with the check sum . Once the crc mis-match , reverse shift the correct crc and bad crc along with the check sum(minus data). Until they match again in some specific location . Then use the check sum to calculate the error value .
for a stream of data? no, not simple. for "On/OFF" or PWM signal, yes simple. the reason is because data needs error correction, crc sum checks etc. you must have a transmitter/receiver that his high noise rejection to retain good data. data must be 100% received or it is not at all. if PWM signal, not so much a big deal. if you rece