Achieving Better Performance Using a New Variable LMS Algorithm Equalizer for Systems-Based OFDM

Effective algorithms in modern digital communication systems provide a fundamental basis for increasing the efficiency of the application networks. Equalizations are one of the preferred methods for increasing the efficiency of application systems such as OFDM. The step size is one of the main parameters of the equalization algorithms, because its value and its determining method change the convergence speed and as a result change the bit rate value. In this paper, we improve the OFDM modulation employing a new VLMS equalizer with a variable step size. The simulation results show that the proposed method has lower misadjustment and BER in different SNRs, especially for low SNRs. The proposed algorithm has better performance with respect to FLMS with different step size and the wellknown Kwong VLMS equalizer in the standard SUI channels in the OFDM modulation. Therefore, this VLMS equalization is a good choice for high speed and real-time applications such as OFDM based systems.