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This paper investigates the joint number of subcarriers and poweroptimization in Multi user Orthogonal Frequency Division Multiplexing basedDifferential Chaotic Shift Keying systems with noise reduction. We first find aclosed-form expression for the optimal number of references in MU OFDM DCSKsystems, while existing works only consider the numerical simulations.Moreover, this paper is the first to consider jointly subcarrier and powerallocation in the MU OFDM DCSK system by defining a fractional problem. The BERexpression of the MU OFDM DCSK system as an objective function is nonconvex andcomplex, which makes the analytical solution so difficult. We make it tractableby converting the fractional problem into a subtractive form, which leads to anear optimal solution. Simulation results show that our proposed approachprovides better BER performance than the existing plans.

Joint Subcarrier and Power Allocation in MU OFDM DCSK Systems with Noise Reduction