MIMO-OFDM Performance Analysis between Discrete Fourier and Discrete Wavelet Transform Techniques in LTE

Abstract: Orthogonal Frequency Division Multiplexing (OFDM) is one of the main techniques employed in 4th Generation Long Term Evolution (LTE). In OFDM because of loss of orthogonality between the subcarriers there is intercarrier interference (ICI) and intersymbol interference (ISI) and to overcome this problem use of cyclic prefixing (CP) is required which uses 20% of available bandwidth. Wavelet based OFDM provides good orthogonality and with its use Bit Error Rate (BER) is improved. Wavelet based OFDM is used at the place of Discrete Fourier Transform (DFT) based OFDM in LTE. Compared the BER performance of wavelets and DFT based OFDM and implementation is done for SISO antenna configuration. It is proposed to use MIMO antenna configuration. Also along with BER, SER plots can be taken .BER performance of MIMO configuration can be obtained.

Keywords: MIMO, LTE, OFDM, BER.