Advanced Digital Communication Trainer
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1 Model: DMT-1000 CYBER NOMADS Cyber Nomads making it happen... 11,Indrapuri, 101, Prabhdeep Indore Ph.: , anitag@cyber-nomads.com
2 Model: DMT Introduction Modulation Demodulation Channel Var. Channel Var. USB RF Power Con. Digital Incoding RF 900MHz Recev. Gain Con. Digital Incoding USB Random Func. DMT-1000 BASE DMT-1000 REMOTE BER Test < Block Diagram > is designed for learning Basic Concepts and Functions of Digital Communication System. This Trainer has various features that are not available in the existing Digital Communication training equipments. These features are Modulation / Demodulation wave observation, Modulation Block Forming, Selection of coding and decoding methods, BER test etc. The performance of various types of receivers can be tested by using different detection circuit boards. Also, our Trainer (DMT-100) is a transceiver and two devices communicate in real time over 900MHz band. The students can actually observe wireless communications process in detail. Especially, we have focused on the core contents of digital modulation and demodualtion scheme such as ASK, FSK, PSK. And, the concept of PCM, PWM, PAM, PPM schemes can be experimented through simulations. 2. Function -. Comparison of FFT spectrum of Various Modulation Schemes -. RF Transmitter/Receiver Experiment using 900MHz Band(Half Du plex) -. Comparison of various Demodulation Schemes 1
3 -. Comparison of BER for various Modulation methods -. Able to Monitor and Control the experiment using PC Software -. Able to Test Various detection circuits -. Can select Coding and decoding method -. Various composition block of modulation -. Dual mode device(transceiver) -. Modulation experiment of the ASK, FSK, PSK -. Simulation Experiment of the PCM, PAM, PWM, PPM -. Partially Spectrum Analyzing Function -. Screen Print of Digital data -. Modulation and demodulation simulation experiment of the ASK, PSK, FSK, MSK and QAM 3. Specifications No. Parameters Test Conditions Min. Typ. Max. Unit Supply-voltage range 11 30V Supply current (Without Detection Board) Tx mode Rx mode Half duplex mode RF Parameters [Base mode] VCO Frequency range VCO Output Level 1 Channel spacing 50 Tx Frequency range Tx Output Level Gain max 8 12 Tx Gain control range 35 d Rx Frequency range Zero IF Output Gain 45 d Detection Board [Differential Peak] Supply current FSK [BER 0.1%] Sensitivity dm Detection Board [Ratio & Envelope] Supply current Sensitivity FSK [BER 0.1%] dm Detection Board [PLL] Supply current Sensitivity PSK [BER 0.1%] dm Detection Board [Quadrature] Supply current Sensitivity PSK [BER 0.1%] dm 2
4 4. Contents Part 1. Pulse Mod-Demodulation Chap1. Basic Theory 1-1. Pulse 1-2. Characteristics of Pulse Signal 1-3. Transfer of Signal Chap2. Pulse Mod-Demodulation 2-1. Pulse Amplitude Modulation 2-2. Pulse Width Modulation 2-3. Pulse Position Modulation Chap3. PCM (Pulse Code Modulation) 3-1. Pulse Code Modulation 3-2. Sampling 3-3. Quantization 3-4. Encoding > Exp. 1 PAM Mod-Demodulation > Exp. 2 PTM Mod-Demodulation > Exp. 3 PCM Mod-Demodulation Part 2. Digital Mod-Demodulation Chap4. ASK (Amplitude Shift Keying) 4-1. ASK Modulation 4-2. ASK Demodulation Chap5. FSK (Frequency Shift Keying) 5-1. FSK Modulation 5-2. FSK Demodulation Chap6. PSK (Phase Shift Keying) 6-1. PSK Modulation 6-2. PSK Demodulation > Exp. 4 ASK Modulation > Exp. 5 ASK Demodulation > Exp. 6 FSK Modulation > Exp. 7 FSK Demodulation > Exp. 8 PSK Modulation > Exp. 9 PSK Demodulation Part 3. Anomaly Modulation Chap7. Anomaly Modulation 7-1. M-ray FSK 7-2. M-ray PSK 7-3. QAM (Quadrature Amplitude Modulation) Chap8. Filtering 8-1. Filter 8-2. Nyquist or raised cosine filter 8-3. Gaussian filter 8-4. filter bandwidth parameter alpha 8-5. Filter Bandwidth Chap9. Waveform 9-1. Constellation diagram 9-2. Eye diagrams 9-3. Trellis diagrams Chap10. BER (Bit Error Rate) Basic Concept Noise and BER Quantization errors Eb/No and BER SNR[dB] > Exp. 10 M-ray FSK > Exp. 11 M-ray PSK > Exp. 12 QAM Hardware Guide Software Guide Appendix [option] DIY Experiment (11 peices) PAM Modulation Circuit (Natural sampling) PAM Modulation Circuit (Flat-top sampling) PAM Modulation Circuit 1 PAM Modulation Circuit 2 PPM Modulation Circuit PPM to PWM translation Circuit Low Pass Filter 1 Low Pass Filter 2 Envelop Detection Circuit Ratio Detection Circuit Double balance mixed Detection Circuit 3
5 5. User Interface -. Screen Shots of Main experiment. Modulation Parameter Selection Window, Screen shot Print of Digital Data Modulation Block Selection window -. Figure of PAM experiment 4 Modulation Wave Window
6 -. PCM experiment -. PPM experiment 5
7 -. PWM experiment -. Digital Demodulation experiment 6
8 -. ASK Modulation Simulation experiment -. FSK Modulation Simulation experiment 7
9 -. MSK Modulation Simulation experiment -. QAM Modulation Simulation experiment 8 <Pls note Software English conversion work is progressing>
10 6. Trainer Configuration DMT-1000 BASE DMT-1000 REMOTE < This device can be upgraded by changing modules> 7. Components Transceiver Detection board USB Cable Antenna Program CD Textbook Adaptor(9V) Aluminum Bag 2EA 6EA 2EA 2EA 1EA 1EA 2EA 1EA 9 Cyber Nomads making it happen... CYBER NOMADS 11,Indrapuri, 101, Prabhdeep Indore Ph.: , anitag@cyber-nomads.com
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