Complementary Unipolar Duty Cycle Division Multiplexing (CUDCDM): a Novel and Economical Multiplexing Technique
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A new multiplexing technique based on duty cycle division is proposed, under the name: Complementary Unipolar Duty Cycle Division Multiplexing (CUDCDM). CUDCDM can be applied in both electrical and optical domains. The new technique allows for more efficient use of time slots as well as the spectrum taking advantage of both the conventional time division multiplexing TDM and FDM. The basic properties based on theoretical analysis as well as simulation studies have been done to evaluate the performance of this technique based on the signal energy and symbol error rate (SER). In this paper the performance of complementary unipolar duty cycle division multiplexing compared with multi level M-ary signaling as well as the conventional (TDM) technique. The simulation has been set for wireless transmission based on free space propagation model with adaptive white Gaussian noise (AWGN). PSK and QAM are used as modulation schemes to evaluate these techniques against data rate and number of users. The study shows that the energy per bit in CUDCDM, unlike that of TDM technique, increases with the number of users. The simulation results correspond with the theoretical study in which the CUDCDM technique has better SER than that of TDM, even in more distances.
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