Baseband Transmission and Synchronization

Innovative Technologies in Education (ITE)

The baseband transmission & synchronization module will consist of various techniques of baseband data transmission currently used in digital communications systems. Data signals should be converted into Baseband sequence of data symbols. Specifically, 2B1Q and AMI/TBC coders will be studied. The module contains a transmission channel, a receiver and two different time recovery synchronization circuits.
RECOMMENDED EXPERIMENTS

1. Twined Binary Code - Spectral shaping by TBC precoding 2. AMI Code - error propagation - differential coding 3. Comparison of AMI with 4-level PAM (2B1Q) - sensitivity to DC/AC coupling - line polarity sensitivity - bandwidth - synchronization 4. Intersymbol Interference (ISI) & Eye Pattern - eye patterns for various bandwidths with AMI and 2B1Q codes 5. Time recovery with squaring circuit 6. Time recovery with zero crossing circuit 7. AMI noise performance 8. 2B1Q noise performance 9. Timing Recovery Performance

TECHNICAL SPECIFICATIONS

The baseband transmission & synchronization Training System will consist of the following main blocks:

- Pseudo-Random Sequence Generator - 2b1q Coder (=4 Level Pam) - Ami-Tbc Coder (Alternate Mark Inverse) - Bpf - Integrate And Dump Filter - Sample And Hold - Line Equalizer - Low Pass Filter - Slicer & Decision Circuit For Tbc-Ami - Slicer & Decision Circuit For 2b1q Code - Decoder For 2b1q - Squaring Circuits - Band Pass Filter - Phase Adjustment - Zero Crossing Detector - Phased Lock Loop