An All Digital Implementation of M-VSB MODEM using Advanced Digital Signal Processing Techniques

Abstract

This paper presents a DSP based implementation of a vestigial side band (VSB) modem. Utilizing the flexibility of advanced/multirate signal processing techniques, a novel method is first used to generate the VSB signal at the modulator. The focus of this paper is the design of the demodulator where we demonstrate efficient carrier & timing synchronization techniques. We show that with a small change in perspective, the VSB signal can be viewed as an off-set quadrature phase shift keying (O-QPSK) signal. We exploit this perspective and present algorithms and structures applicable to O-QPSK to perform carrier and timing recovery for M-VSB