FUNCTIONAL APPROACH TO THE SYNTHESIS OF CONCURRENT ERROR-DETECTION CIRCUIT BASED ON BOOLEAN COMPLEMENT AND USE OF "2-OUT-OF-5" CONSTANT-WEIGHT CODE

A method for self-checking concurrent error-detection circuit synthesis based on Boolean com-plement and "2-out-of-5" constant-weight code is described. The method is notable for using functional relationship between the signals from the working and control outputs instead of ana-lyzing the unit performance on each input. The functional dependence is established with due account to the requirements for the formation of codewords of the "2-out-of-5" code and a com-plete tester check. In addition, it considers the formation of a complete set of test combinations for transformation elements in the concurrent error-detection circuit. A method for obtaining a functional relationship between the control outputs and the operating outputs of the diagnostic object is presented. One of the options for extending the definition of the control function values is presented, as well as the functional dependence. It is noted that the number of options for ex-tending the definition of the control function values is large, which allows numerous options for synthesizing a concurrent error-detection circuit for any diagnostic object based on the described method. The use of the "2-out-of-5" code for the synthesis of concurrent error-detection circuits applying the Boolean complement method proved its effectiveness for organizing self-checking digital devices in automatics and computer technology.

Joint Error-Dimming Control Using Constant Weight Coding in Visible Light Communication Systems

To enhance commercial implementation, visible light communication (VLC) should facilitate dimming control and reliable data transmission simultaneously, where users can adjust the brightness levels arbitrarily. Constant weight code (CWC) based dimming method can achieve higher spectral efficiency, but the codewords need further selection to exponentially map the massage. In this paper, based on CWC, we proposed a method to achieve dimming control as well as improve error performance via optimizing the average Hamming distance of the codeword set. Simulation results show that the optimal codeword set can achieve better error performance.