Timing recovery for two-dimensional modulation codes

Abstract

An interest in the application of two-dimensional modulation codes to the coding of information in magnetic recording has lead to an investigation of symbol synchronization for these channels. Binary data storage in magnetic recording systems is accomplished by mapping sequences of 0's and 1's into patterns of magnetic flux changes along a track. With two-dimensional modulation codes, data is encoded in a manner such that clocking information can be derived from any number of those tracks while ensuring against intersymbol interference in each track individually. In this thesis, timing extraction for multiple parallel tracks in the presence of additive white Gaussian noise through a square-law device is studied and the design of the synchronizer circuitry is also presented. Finally, extensive simulations are carried out to determine the performance of the system.