Symlet2 Based Wavelet Filter Bank for Uncorrelated Digital Signal Recovery: Some Advantages over Matched Filter

Presence of noise in communication channels presents difficulty in signal recovery at the receiver. In this paper a methodology is developed for signal recovery using a wavelet filter bank (WFB), with applicability to baseband receivers. Uncorrelated test signals, useful in many practical applications, are conceived and used for the experimentation. This test signal is polar Non-Return-to-Zero (NRZ) line coded and transmitted through AWGN channel. Though we have considered the Symlet2 based WFB for this study, the methodology is suitable for any other filter bank too. The performance of the WFB-receiver in terms of Bit Error Rate (BER) is compared with that of a conventional matched filter based baseband receiver (MF-receiver). The results show that the WFB-receiver performs better than the conventional MF-receiver for certain input parameter ranges. Appropriate selection of the WFB and the use of adaptive filtering for improvised signal recovery come under future prospects of this research.