Recent Progress of ILO-Based Novel Synchronization Techniques for Transceivers Used in Broadband Wireless Communication Systems

To deliver data at hundreds of megabits per sec over wireless media with high accuracy requires high signal acquisition and synchronization speeds. Many techniques have been developed in the past and choice of a right synchronization technique has become user and application specific. In this paper, we present our recent progress on the development of synchronization techniques, first, by reviewing the present techniques and then by presenting our work on using injection-locked techniques. Our work include the second-harmonic injection-locked phase-locked loop (SH-ILPLL) for BPSK signal demodulation with wide locking range, a single-frequency ILO for high speed 160 Msps QPSK detection and a selectable frequency dielectric resonator oscillator (SF-DR-ILO) based synchronization for coherent demodulation of multi-frequency QPSK signals of up to 63Msps. Our novel synchronization techniques can be used for modern communication systems such as WiMax or UWB applications. They can also be used for a fixed frequency or multiple-frequency high data rate video transmission over the indoor reciprocal channel.