30 Bit Hamming Code for Error Detection and Correction with Even Parity and Odd Parity Check Method by using VHDL
Kumar Gupta Brajesh, Rajeshwar Lal Dua Prof. · International Journal of Computer Applications · 2011
Hamming code error detection and correction methodology is used for error free communication in communication system. In communication system information data transferred from source to destination by channel. In between source and destination data may be corrupted due to any type of noise. To find original information we use Hamming code error detection and correction technique. In hamming code error detection and correction technique to get error free data at destination, we encrypt information data according to even and odd parity method before transmission of information at source end. In hamming code with even and odd parity check method by using VHDL, we transmit 25 bit information data with 5 redundancy bits from source and receive this data at destination. To find the value of these redundancy bits we have two methods, one of them is even parity method and another is odd parity method. In this paper we have written VHDL code for both methods at source as well as destination side. At the point of destination, we receive 30 bit data, which was transmitted by source end. This receives data may be corrupted due to noise. To remove this noise we find the address of error bit then correct them. For finding the location of error bit and correct them we have again two methods one of them is even parity check method and another is odd parity check method .To find the location of error bit and correct them we write code in VHDL for destination . In this paper we have written VHDL code for finding error location and correct error bit. We have also written code for decrypt this 30 bit encrypted data into 25 bit information data. Because of this code there is no need to use another circuit for decryption of encrypted data. Up to today, at destination we were using one circuit for correcting error bit and another circuit for finding the information data from encrypted data. Now we can use only one circuit for correction error bit and finding the actual information data.