Systematic Unidirectional Error-Detecting Codes
IEEE Transactions on Computers
Error control systems for digital communication and storage
Error control systems for digital communication and storage
Codes for Detecting and Correcting Unidirectional Errors
Codes for Detecting and Correcting Unidirectional Errors
Asymmetric/Unidirectional Error Correcting and Detecting Codes
IEEE Transactions on Computers
Error Control Coding, Second Edition
Error Control Coding, Second Edition
Analysis of Plain and Diversity Combining Hybrid ARQ Protocols Over the -Ary Asymmetric Channel
IEEE Transactions on Information Theory
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Forward error control (FEC) and Automatic-repeat request (ARQ) are two main techniques used for reliable data transmission in computer and communication systems. In this paper, some simple, low cost error control techniques for ARQ protocols used with binary unidirectional channels are described. The proposed schemes can correct up to \lfloor{\frac{t}{2}}\rfloor unidirectional errors using t--unidirectional error detecting codes and code combining with a much smaller number of retransmissions. First, we show how to do code combining for unidirectional errors. To use code combining with unidirectional codes, we need to identify the type of error (0 \rightarrow 1 or 1 \rightarrow 0) from the received word. We show how this can be done for various unidirectional codes.