A Novel Approach based on Lifting Wavelet Transform for MIMO-OFDM Systems

Abstract

In this article, two methods are proposed to further increase the advantages of MIMO-OFDM systems such as high access quality, high data rates and spectral efficiency. The first of these is the combination of the MIMO-OFDM system with the fast Walsh Hadamard transform (FWHT) due to its high accomplishment with the ability to spread the data versus the disturbing influences of the channel. The second is the combination of Lifting wavelet transform (LWT), due to its superior advantages such as good time-frequency localization properties, ICI and ISI suppression capabilities due to its orthonormal structure, unlike fast Fourier transform (FFT), with MIMO-OFDM scheme. Computer simulation studies are carried out to verify the accomplishment of the suggested methods over the bit error rate (BER) and peak to average power ratio (PAPR) benchmark. From the acquired outcomes, it is noticed that approximately 6 dB of SNR gain and approximately 2 dB of PAPR gain are achieved with the proposed method.

A novel Block Bi‐diagonalization based pre‐coding scheme for bit error reduction in mutiple input multiple output‐orthogonal frequency division multiplexing

“…In another work in Sarowa et al, 12 improved self‐cancelation (ISC) for the MIMO‐OFDM system using DWT schemes is introduced to mitigate the peak‐to‐average‐power‐ratio (PAPR) and inter‐carrier interference (ICI). In addition, lifting wavelet transform 13 is introduced for MIMO‐OFDM systems to overcome the ICI and symbol interference among the channel. But, this technique requires a downsampling process to process the entire operation.…”