What is a Communications System?
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1 Introduction to Communication Systems: An Overview James Flynn Sharlene Katz What is a Communications System? A communications system transfers an information bearing signal from a source to one or more destinations. Examples: Radio TV Telephone (landline or wireless) Computer Network (terminal-computer or computercomputer) Radar Wireless Microphone 2 1
2 Communications System Diagram Information Source and Input Transmitter Channel Receiver Output 3 Communications System Diagram Information Source and Input Transmitter Channel Receiver Output Information Source: Audio, image, text, data Input : Converts source to electric signal Microphone Camera Keyboard 4 2
3 Communications System Diagram Information Source and Input Transmitter Channel Receiver Output Output : Converts electric signal to useable form Speaker Monitor 5 Communications System Diagram Information Source and Input Transmitter Channel Receiver Output Transmitter: Converts electrical signal into form suitable for channel Modulator Amplifier 6 3
4 Communications System Diagram Information Source and Input Transmitter Channel Receiver Output Channel: Medium used to transfer signal from transmitter to receiver. Point to point or Broadcast Wire lines Fiber optic cable Atmosphere Often adds noise / weakens & distorts signal 7 Communications System Diagram Information Source and Input Transmitter Channel Receiver Output Receiver Extracts an estimate of the original transducer output Demodulator Amplifier 8 4
5 Why do we need Modulation/Demodulation? Example: Radio transmission Voice Microphone Transmitter Electric signal, 20 Hz 20 KHz Antenna: Size requirement > 1/10 wavelength At 3 KHz: 9 λ = c f = =105 =100km.1λ =10km Antenna too large! Use modulation to transfer information to a higher frequency Why do we need Modulation/Demodulation? (cont d) Frequency Assignment Reduction of noise/interference Multiplexing Bandwidth limitations of equipment Frequency characteristics of antennas Atmospheric/cable properties 10 5
6 Types of Modulation Analog Modulation: A higher frequency signal is generated by varying some characteristic of a high frequency signal (carrier) on a continuous basis AM, FM, DSB, SSB Digital Modulation: Signals are converted to binary data, encoded, and translated to higher frequency FSK, PSK, QPSK, QAM More complex, but reduces the effect of noise 11 Communications Channels Wireline Twisted Pair Cable Waveguide Fiber Optics Wireless (radio): Transmission of electromagnetic waves from antenna to antenna KHz to ultraviolet Increasing bandwidth Propagation characteristics vary with frequency 12 6
7 Propagation Characteristics of Radio Channels Ground Wave Low MHz Waves guided between earth and ionosphere Distance of communication varies based on wavelength AM Radio (1 MHz) propagates < 100 miles in day but longer at night Predictable propagation Sky Wave Low MHz 30 MHz Signals reflect from various layers of ionosphere Changes based on time, frequency, sun spots Signals travel around the world Less predicable propagation 13 Propagation Characteristics of Radio Channels (cont d) Line of Sight Above 30 MHz Need little or no obstruction limited by horizon Noise issues In GHz range rain issues Used for Satellite and local communications Very predictable / stable propagation Other Channels Acoustic channels 14 7
8 Table of Frequencies ELF : 0 3 khz. Submarine communications. VLF : 3 30 khz. Submarine communications, Time Signals, Navigation LF : khz. Navigation, Time Signals. MF: 300 khz 3 mhz. Maritime Voice/Data, AM Broadcasting, Aeronautical Communications. HF: 3 30 mhz. Shortwave Broadcasting. Amateur, Point to Point data. Maritime Voice/Data. Aeronautical Communications. VHF : mhz. Police, Fire, Public Service mobile. Amateur. Satellite. Analog TV. FM Broadcast. 15 Chart of Frequencies (cont d) UHF : 300 3,000 mhz (3 ghz) Police, Fire, Public Service communications. Satellite. Analog and HD TV. Telemetry (flight test). Radar. Microwave links (telephone/data). WiFi. SHF : 3 30 ghz Radar. Satellite. Telemetry. Microwave links EHF : ghz Radar. Satellite. Microwave links. 16 8
9 8/19/08 System Performance The performance of a communications link depends on the Signal to Noise ratio (S/N) at the receiver Signal: The power received, Pr, is given by: Pr = Noise 17 Pt gt gr λ2 (4π) 2 d 2 Receiver/Antenna noise Atmospheric noise Galactic Noise Sun Noise Thermal noise Traditional Transmitter/Receiver Hardware 18 9
10 Disadvantages of the Traditional Receiver Simple modulation / demodulation only Limited implementation of filters Alignment Aging Complexity Fixed design: frequency/mode Non linearity unwanted signals 19 What is Software Defined Radio (SDR)? A new technology for implementing radio communications systems Art and science of building radios using software Eliminating hardware and moving software as close to the antenna as possible 20 10
11 Software Defined Radio Analog to Digital Converter Software Radio is modified by changing the software. The hardware remains the same 21 Current SDR Applications Military Radio Astronomy Amateur Radio 22 11
12 Future SDR Applications Personal Communications Cell phones Wi Fi Entertainment distribution Public Safety Broadcasting Digital Radio Digital Television 23 Components of a SDR System Daughterboard (optional) Motherboard ADC FPGA (Decimator, MUX, etc.) USB Controller PC Shifts the frequency of the desired signal Samples the analog signal Performs initial signal processing Software for Transmitter /Receiver 24 November 30,
13 USRP - Motherboard/Daughterboard 25 November 30, 2007 GNU Radio Software Community-based project started in 1998 GNU Radio application consists of sources (inputs), sinks (outputs) and transform blocks Transform blocks: math, filtering, modulation/demodulation, coding, etc. Sources: USRP, audio, file input, signal generator, Sinks: USRP, audio, file output, FFT, oscilloscope, Blocks written in C++ Python scripts used to connect blocks and form application 26 November 30,
14 Questions? 14
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