Constrained Least Mean Logarithmic Square Algorithm: Design and Performance Analysis

This paper introduces a novel constraint adaptive filtering algorithm based on a relative logarithmic cost function which is termed as Constrained Least Mean Logarithmic Square (CLMLS). The proposed CLMLS algorithm elegantly adjusts the cost function based on the amount of error thereby achieves better performance compared to the conventional Constrained LMS (CLMS) algorithm. With no assumption on input, the mean square stability analysis of the proposed CLMLS algorithm is presented using the energy conservation approach. The analytical expressions for the transient and steady state MSD are derived and these analytical results are validated through extensive simulations.