Comparative Analysis of Modulation Techniques in LTE: A Ber Study of Conventional and Wavelet-Based OFDM

Abstract

The Long Term Evolution communication mechanism uses two primary techniques: Multiple Input and Multiple Output (MIMO) and Orthogonal Frequency Division Multiplexing (OFDM). As opposed to Frequency Division Multiplexing (FDM), which uses just one carrier, the OFDM system employs several carriers and offers a better level of spectral efficiency. Due to the loss of subcarrier orthogonality, there are issues with the OFDM systems such intersymbol interference and intercarrier interference. Before the signal enters the channel, a cyclic prefix is appended in an attempt to avert this issue. By including the cyclic prefix data, which consumes 20% of the bandwidth, As a result, the bandwidth's inefficiency is increased. When trying to address it, Wavelet-based OFDM offers high orthogonality, and Bit Error Rate (BER) is enhanced with its use. Spectrum efficiency is boosted by the wavelet-based system's lack of cyclic prefix. In place of Discrete Fourier Transform (DFT)-based OFDM in LTE, it is suggested that wavelet-based OFDM be used. The BER performance of wavelets and DFT-based OFDM has been compared.