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Communication Systems Engineering Episode 1 Part 10

Tham khảo tài liệu 'communication systems engineering episode 1 part 10', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 16.36 Communication Systems Engineering Lectures 14 Cyclic Codes and error detection Eytan Modiano Cyclic Codes A cyclic code is a linear block code where if c is a codeword so are all cyclic shifts of c - E.g. 000 110 101 011 is a cyclic code Cyclic codes can be dealt with in the very same way as all other LBC s - Generator and parity check matrix can be found A cyclic code can be completely described by a generator string G - All codewords are multiples of the generator string In practice cyclic codes are often used for error detection CRC - Used for packet networks - When an error is detected by the received it requests retransmission Error detection techniques Used by the receiver to determine if a packet contains errors If a packet is found to contain errors the receiver requests the transmitter to re-send the packet Error detection techniques - Parity check E.g. single bit - Cyclic redundancy check CRC