An efficient one-hot OHR adder circuit

residue number system (RNS) is an appropriate system for arithmetic operation because of its speed in addition and multiplication. One hot residue number (OHR) system has increased this speed. Major problem in an OHR system is its large hardware module, because of using barrel shifter structure in it. OHR designs for add operation have hardware complexity in the order of m² in which m is the selected module. In this paper an efficient structure for add operation in OHR system is introduced in which the needed hardware is in the order of m²/2.