Channel estimation of OFDM Systems by using the Wavelet Decomposition method with different Transforms Techniques

Abstract

In OFDM multiple carriers square measure used and it provides higher level of spectral potency as compared to Frequency Division Multiplexing (FDM). In OFDM as a result of loss of orthogonality between the subcarriers there\'s repose carrier put downference (ICI) and inter image interference (ISI) and to beat this downside use of cyclic prefixing (CP) is needed, that uses 2 hundredth of obtainable information measure. Comparison between typical|the traditional|the standard} FFT based mostly} OFDM systems with DWT based OFDM system are created in line with some conventional and non-conventional modulation ways over AWGN. The ripple families are used and compared with FFT {based|based mostly|primarily based mostly}} OFDM system and located that DWT based OFDM system is best than FFT based OFDM system with regards to the bit error rate (BER) performance.