Lecture 1 Introduction to Communication Systems. ECE4900/ECE6720 Digital Communications

Size: px

Start display at page:

Download "Lecture 1 Introduction to Communication Systems. ECE4900/ECE6720 Digital Communications"

Sharon Montgomery
6 years ago
Views:

1 ECE4900/ECE6720: Digital Communications 1 Lecture 1 Introduction to Communication Systems

2 What is a Communication System? Smart Phone 2

3 What is a Communication System? Transceivers in Smart Cars 3

4 What is a Communication System? Navigation and Communication Radios in Boats 4

5 What is a Communication System? Portable Transceivers 5

6 What is a Communication System? Underwater Acoustic Radio 6

7 What is a Communication System? Beehive of Satellites enable Communications! 7 Total number of operational satellites in orbit=1400 (Total number of junk satellites in orbit=2500)

8 Block Diagrams of Communication System Generic Communication System Qualcomm MDM9635M LTE Modem in iphone6 8

9 Basics of Wireless Communications Transmitter transmits information via carrier signal Q: Why do we need carrier signal? A: 1) Carrier signal carries information by alteration of its amplitude, frequency and/or phase 2) The alteration of carrier signal is called modulation 3) The modulated carrier signal can be transmitted with smaller antennas at lower power to reach long distances 9 Information (baseband signal at lower frequency) Carrier signal at higher frequency Up-converted Baseband Signal

10 Basics of Wireless Communications Frequency Bands 10 Cellular Frequencies 3G, 4G, LTE

11 Basics of Wireless Communications ISM (Industrial, Scientific and Medical) Bands IEEE standards Used for short-range wireless (home, office etc) 11

12 Block Diagrams of Communication System Digital Communication System 12 Informatio n (sound, video, text, data, ) Transducer & A/D Converter Source Encoder Channel Encoder Modulator Tx RF System Channel Output Signal D/A Converter and/or output transducer Source Decoder Channel Decoder Demodulator Rx RF System = Focus of this class

13 Block Diagrams of Communication System Software Defined Radio (SDR) 13 In SDR, the transmitter and receiver operations can be changed by software alone without making any changes to the hardware

14 Software Defined Ratio (SDR) Examples 14 Microtelecom PERSEUS Great Scott Gadgets HACKRF Nuand BLADERF Limemicro LIMESDR Ettus Research USRP Airspy AIRSPY MINI SDRs can implement any modulation type between 100 khz to 6 GHz

15 5G Wireless Prototyping (mobile network at 10 Gb/s, NI research) Software Defined Ratio (SDR) Amateur Radio Receiver AIS Tracking (locate ships) 15 Joint Tactical Radio System (JTRS) Satellite Receiver Public Safety and Emergency Response

16 Inside the Smart Phone: The Transceiver Qualcomm MDM9635M/WTR1605/WTR3925 RF Transceivers (used in phone and tablets for 2G, 3G, 4G/LTE) 16 Qualcomm MDM9635M Qualcomm WTR3925

17 WTR3925 and MDM9635 Block Diagrams Qualcomm WTR Qualcomm MDM9635M

18 Final Project Graduate Students will simulate transceiver for a given Standard (3G, 4G/LTE, Wifi, Wimax, etc): demonstrate data transfer 18 Informatio n (sound, video, text, data, ) Transducer & A/D Converter Source Encoder Channel Encoder Modulator Tx RF System Undergraduate Students will simulate receiver for a given Standard (3G, 4G/LTE, Wifi, Wimax, etc): demonstrate data transfer Channel Output Signal D/A Converter and/or output transducer Source Decoder Channel Decoder Demodulator Rx RF System

19 Final Project: Example Wireless Standards 19

20 Final Project: Modulation Schemes 20 1) 2) Explanation

21 Bit Error Rate (BER) Plots Final Project: Deliverables 21 Successful Decoding of Data or Image I like Sunspots Simulink Model for a, g, GSM, or LTE etc I like Sunspots

Lecture 10 Performance of Communication System: Bit Error Rate (BER) EE4900/EE6720 Digital Communications

EE4900/EE6720: Digital Communications 1 Lecture 10 Performance of Communication System: Bit Error Rate (BER) Block Diagrams of Communication System Digital Communication System 2 Informatio n (sound, video,