Babak Sayar

Title: Babak Sayar and His Patents in Digital Communications

Introduction

Babak Sayar is an inventor associated with Ottawa, Canada, and Northern Telecom Limited. His patent work addresses signal processing and timing recovery in digital data transmission systems. The supplied information lists 2 patents.

Latest Patents

**Equalizer for ISDN-U Interface.** This invention describes a receiver that samples digital signals arriving over a subscriber loop and uses a precursor equalizer to filter them. The equalizer is designed to create one or more zero crossings before the main pulse, helping the timing recovery circuit control the sampling instant. The patent also describes alternative equalizer configurations for twisted-wire-pair loops and a filter that can be placed before the equalizer.

**Method and Apparatus for Timing Recovery.** This invention concerns a receiver for a digital transmission loop interface. It samples a substantially randomized, four-level signal and uses a multilevel slicer to identify symbols. A timing recovery circuit determines the sampling instant using a precursor sample and a main-pulse sample separated by one baud.

Career Highlights

Sayar’s listed inventions focus on improving signal equalization and sampling timing in digital communications. These techniques address challenges in receiving data over subscriber loops.

Collaborations

The supplied information identifies Northern Telecom Limited as Sayar’s company and Sami A. Aly as a coworker. It does not specify the nature or details of their collaboration.

Conclusion

Babak Sayar’s listed patents reflect work on equalization and timing recovery for digital transmission receivers, with applications to subscriber-loop communications.