DESIGN OF WAVELET PACKET BASED MODEL FOR MULTI CARRIER MODULATION

摘要

In current scenario Multi-Carrier modulation (MCM) is considered an effective technique for both wire and wireless communications. It divides the entire bandwidth into several parallel sub-channels. This splitting is by dividing the transmit data into several parallel low-bit-rate data streams and then to modulate the carriers corresponding to those sub-channels. Though MCM technique uses Orthogonal Frequency Division Multiplexing (OFDM) model, it is very sensitive to Carrier Frequency Offset (CFO), that leads to a severe distortion in subcarrier orthogonality and causes inter channel interference (ICI). In this paper, Wavelet Packet Transform is designed for the model of MCM as a novel alternative to the most exiting Orthogonal Frequency Division Multiplexing (OFDM) technique, because of its time frequency representation and lower side lobes in transmitted signals, that reduces inter carrier interference (ICI), and inter symbol interference (ISI). Performance analysis is investigated for such model. Simulation results show a significant enhancement in terms of spectral efficiency.