Author: mwdAdmin

• OFDM Modulator and Demodulator system in a handy TechBook
• User friendly real-time interactive control and acquisition software for detail study of OFDM
• Software control built-in data pattern generator
• 64 point IFFT & FFT with Baseband QPSK modulation & Demoudulation Techniques.
• Built-in Mixed signal oscilloscope to analyze in time domain at various stages of OFDM
• Built-in noise generator for analysis of noise gain on the signal.
• On-board BNC connector for OFDM baseband I-Q signal analysis on external DSO.
• LED indications on TechBook
• USB Interface

OFDM Modulator and Demodulator Experimentation with and without noise gain. SIgnal Analysis at various stages like, Transmit data & Received data, IFFT & FFT, Symbol mapper & de-mapper per channel, and Cyclic prefix & its removal.

Technical Specification

• Technique : OFDM with QPSK modulation & Demodulation
• Software programmable data rate
• Built in real-time data acquisition system with time domain signal analysis
• Buit in Two channel Additive White Gaussian Noise Generator
• I & Q Channel DACs-10 bit
• Anti-aliasing low pass filter with 3dB bandwidth of I & Q channel filter: Sallen Key 6-pole Butterworth.
• Block Level LED indication on TechBook.
• Mains Supply : 110-220 V AC, 50/60Hz
• Operating Conditions : 0-40 C, 80% RH
• Weight : 2 Kg (approximately)

• Modulator and Demodulator on same board
• Different type of sampling, Natural, Flat top, sampled and hold
• On-board DDS Signal Generator for standard and arbitrary signals
• Selectable sampling frequencies for PAM
• Selectable Ramp frequencies for PWM and PPM
• On board 2nd order Butterworth low pass filter
• SMD LED Indicators
• Can be issued just like a book for hands-on learnings

PAM Modulator & Demodulator

Study and Analysis of:

• Pulse Amplitude Modulation(PAM).
• Nyquist sampling rate.
• Natural sampling with different types of message signals at different frequencies.
• Flat top sampling with different types of message signals at different frequencies.
• Sample & Hold output with different types of message signals at different frequencies.
• Under sampling by varying the message frequency and sampling rate
• Second order Low Pass Butterworth filter.
• Demodulation of Sample & Hold output with Second Order Low Pass Butterworth filter.
• Analyze all these Natural sampling, Flat top sampling and Sample & Hold output simultaneously and observe the difference

Line Coding Techniques

Study and Analysis of:

• Different Line Coding techniques.
• Different 8-Bit, 16-Bit and 32-Bit Pattern Generator by changing Pattern selection
• NRZ Unipolar.
• NRZ Polar.
• RZ Bipolar.
• RZ Unipolar.
• Manchester.
• Analyze all types of Line coding outputs simultaneously and observe differences.

PWM Modulator & De-modulator

Study and Analysis of:

• Pulse Width Modulation(PWM) and Demodulation.
• Single bit PWM output by varying the Ramp frequency and signal type.
• PWM demodulated output by varying the Ramp frequency.
• Sample & Hold output of demodulated PWM signal.
• Second order Low Pass Butterworth filter.
• Analyze the final PWM demodulated output with Second order Low Pass Butterworth filter.

PPM Modulator & De-modulator

Study and Analysis of:

• Pulse Position Modulation(PPM) and Demodulation
• Single bit PPM output by varying the Ramp frequency and signal type.
• Sample & Hold output of demodulated PPM signal.
• Second order Low Pass Butterworth filter.
• Analyze the final PPM demodulated output with Second order Low Pass Butterworth filter.

• Modulator and Demodulator on same board
• On-board DDS Signal Generator for standard and Arbitrary signals
• Selectable Sampling Frequencies
• On board Transmission effect
• On board 2nd order Butterworth Low Pass filter
• SMD LED Indicators
• Can be issued just like a book for hands-on learning

PCM Modulator & Demodulator

• Study and analysis of Pulse Code Modulation and demodulation. Single bit PCM output at different line speed clock.
• Study and analysis of Sample & Hold output by varying the sampling as well as signal frequency.
• Study and analysis of Parallel to Serial conversion by varying the line speed clock.

DPCM Modulator & Demodulator

• Study and analysis of Differential Pulse Code Modulation.
• Study and analysis of Sample & Hold output by varying the Sampling as well as signal frequency.

• Modulator and Demodulator on same board
• On-board DDS Signal Generator for standard and Arbitrary signals
• Selectable Sampling Frequencies
• On board Transmission effect
• Selectable step size for Integrator
• Detailed study of granular noise and slope overloading
• On board 2nd order Butterworth Low Pass filter
• SMD LED Indicators
• Can be issued just like a book for hands-on learning

Delta Modulator & Demodulator

• Study and analysis of delta modulation and demodulation.
• Study and analysis of sample & hold output by varying the Sampling as well as signal frequency.
• Study and analysis of Integrator output at the modulator by varying the sampling frequency.
• Study and analyze the improved Integrator output by varying the gain control frequency.
• Understand slope overload distortion problem, granular noise problem
• Analyze single bit delta modulated PCM output, Integrator output at the demodulator.
• Analyze the final delta demodulated output with second order low pass Butterworth filter.

Adaptive Delta Modulator & Demodulator

• Study and analysis of adaptive delta modulation.
• Study and analysis of single bit PCM output by varying the sampling frequency.
• Analyze variable step register at the modulator side, accumulator and add/subtract at the modulator side.

• Modulator and Demodulator on same board
• On-board four DDS Signal Generator for standard and Arbitrary signals
• Selectable Sampling frequencies
• On board four 2nd order Butterworth Low Pass filter
• SMD LED indicators
• Compact and Light Weight
• Can be issued just like a book for hands-on learning

• Study and analysis of 2 channel & 4 channel time division multiplexing
• Study and analysis of sample & hold output at the different channel by varying the sampling as well as signal frequency.
• Study and analysis of parallel to serial conversion by varying the line speed clock at the different channel.
• Study and analysis of single bit PCM output at different line speed clock at the different channels.
• Study and analysis of single bit multiplexed PCM output at modulator side and demodulator side
• Study and analysis of pulse code demodulation at the different channel and perform serial to parallel conversion at the demodulator.
• Analyze the final demodulated output with second order low pass Butterworth filter