Electronic circuits for wireless optical LANs - II

Abstract

This is the second of two papers discussing practical issues and results on the implementation of low-cost transceivers for several wireless optical LANs, covering most physical layer elements. Target optical LANs under consideration have bit-rates varying between 4Mbps and 25Mbps, and input photodiode capacitance may vary between 10pF and 50pF. PPM modulation, either in a 4-PPM or 16-PPM format, is typically used in the physical layer. This paper presents circuits related with sectored receivers, clock recovery and symbol detection.  A final section presents some of the problems related with the evolution of these lowcost systems.