A new pulse compression scheme applied to spread ALOHA in VSAT networks

Abstract

A new pulse compression scheme using inverse filters and sidelobe-optimal sequences is proposed. Comparisons are made between the proposed scheme and the conventional matched filter approach. The new scheme is shown to provide very sharp sidelobe reduction capability without increasing the transmission bandwidth, vis-a-vis the conventional scheme. The performances of the two filtering schemes, embedded in a spread ALOHA communication system in a very small aperture terminal (VSAT) data network, are calculated and compared. The inverse filter scheme in many situations has fewer detection errors then does the conventional matched filter scheme with the same bit-energy to thermal-noise ratio.<>