ECE 21119L: Detection with Decision Maker

• Detection with Decision Maker is a laboratory experiment for ECE 21119L, Digital Communications Laboratory, at the University of Santo Tomas.
• The experiment involves learning about Regeneration Process, TIMS Modules, basic Comparators, and TIMS Decision Makers, with experiment reminders.

Learning Outcomes

• The experiment allows analysis of the decision process for noisy bandlimited bipolar waveforms, using basic comparators and TIMS decision maker modules.
• The experiment helps understand the signal regeneration process.

Signal Regeneration

• A binary sequence waveform's shape is affected when transmitted through noisy and bandlimited channels.
• The goal of transmission systems is to deliver a perfect copy from the transmitter to the receiver.
• The received sequence must be restored or regenerated to its original shape.
• Regeneration is achieved using a detector.
• Two methods to regenerate a signal will be implemented in the experiment.
• One method is using a comparator found in the Utilities Module.
• Another method is using the Decision Maker Module.

Comparator

• The comparator has zero volt as its reference point.
• The output is high when the waveform is above zero volts and low when below zero volts.
• If noise is present and bandlimiting is added, the comparator may not work.

Decision Maker

• The Decision Maker receives a copy of the corrupted sequence and the bit clock.
• It analyzes the incoming sequence at a specific instant within each bit period.
• The best sampling instant can be chosen after inspecting the eye pattern.

Modules

• The modules for Experiment 4 comprise of Sequence Generator, Noisy Channel Model, Decision Maker, and Utilities.

Utilities

• The Utilities Module comprises of Single Pole, Audio Range, RC Lowpass Filter.
• The Utilities Module consists of 4 independent functional blocks which includes a signal comparator with TTL output, and a clipper with bipolar output for squaring analog waveforms.
• A precision half-wave rectifier is part of the functional blocks.
• A single diode and single pole with audio range, and RC Lowpass Filter are included.

Decision Maker

• The DECISION MAKER module accepts up to two TTL, unipolar or bipolar level, baseband digital signals and a synchronized bit clock.
• The input signals are sampled at a point determined by the user, outputting clean digital signals with an in-phase and synchronized bit clock.
• IN1 and IN2 each accept an incoming digital signal.
• If only one digital signal is available, either input may be used, leaving the unused input unconnected.

Reminders

• Experiment files to be submitted include experiment files, post-laboratory reports.
• Naming convention: 3X_GroupY_EZ.pdf, where X = A, B, C, or D; Y = Group Number; and Z = Experiment Number.