Symbol Synchronization for Multi-Channel Modulation
F. Daneshgaran, M. Mondin · 1995
In this paper we analyze the jitter performance of an approximate Decision Directed (DD) Maximum Likelihood (ML) symbol synchronizer for multichannel modulation schemes employing shift orthogonal shaping pulses with overlapping spectra. The ML timing estimator is seen to use the timing information available from all the orthogonal subchannels. We derive expressions for the jitter variance of the approximate DD ML symbol synchronizer for multichannel modulation over a baseband channel with arbitrary energy distribution in each subchannel, and for an arbitrary channel transfer function. We analytically study the effect of the splitting sequences used to generate the multichannels, on the timing jitter variance, and provide criterion for selection of suitable splitting sequences. 1. INTRODUCTION On linear filtering channels with side information, the transmitter may shape the power spectrum of the transmitted signal with the aim of increasing the data rate through the channel in order to...