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EE 551/451, Fall, 2006 Communication Systems Zhu Han Department of Electrical and Computer Engineering Class 6 Sep. 7 th , 2006 Homework1 Homework1 Remote Sensing Mentor Engineering CTA Communications NovaSol Analytical Spectral Local company Smarter Process Incorporated Others

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ee 551 451 fall 2006 communication systems

EE 551/451, Fall, 2006Communication Systems

Zhu Han

Department of Electrical and Computer Engineering

Class 6

Sep. 7th, 2006

homework1
Homework1

EE 541/451 Fall 2006

homework13
Homework1
  • Remote Sensing

Mentor Engineering

CTA Communications

NovaSol

Analytical Spectral

  • Local company

Smarter Process Incorporated

  • Others

Telecommunication systems

Sony

Motorola

Aeroflex

Broadcom

Global Communications

Fujitsu

Rohde & Schwarz

Gilat Satellite Networks

EE 541/451 Fall 2006

homework2
Homework2

Dear all,

Some students asked a question how to plot the response of the filter. Here are some codes that might be useful

z=zeros(10000,1); % generate the delta function.

z(5000)=1; % notice it starts from half, so that it is a delay version.

%otherwise it is a unit function times a delta function.

y=filter(Hd,z); %Hd is the filter parameters

psd(y,10000,22050); %size of samples=10000, fs=22050.

Also, if window such as humming window is added, the fluctuation in the stop-band can be removed. This is because the input z is not infinite long and window can reduce the finite length effect.

Let me know if you have any questions.

Best regards,

Zhu Han

EE 541/451 Fall 2006

carrier recover error
Carrier Recover Error
  • DSB: e(t)=2m(t)cos(wct)cos((wc+ w)t+)

e(t)=m(t) cos((w)t+)

    • Phase error: if fixed, attenuation. If not, shortwave radio
    • Frequency error: catastrophic beating effect
  • SSB, only frequency changes, f<30Hz.
    • Donald Duck Effect
  • Crystal oscillator, atoms oscillator, GPS, …
  • Pilot: a signal, usually a single frequency, transmitted over a communications system for supervisory, control, equalization, continuity, synchronization, or reference purposes.

EE 541/451 Fall 2006

phase locked loop
Phase-Locked Loop
  • Can be a whole course. The most important part of receiver.
  • Definition: a closed-loop feedback control system that generates and outputs a signal in relation to the frequency and phase of an input ("reference") signal
  • A phase-locked loop circuit responds both to the frequency and phase of the input signals, automatically raising or lowering the frequency of a controlled oscillator until it is matched to the reference in both frequency and phase.

EE 541/451 Fall 2006

voltage controlled oscillator vco
Voltage Controlled Oscillator (VCO)
  • W(t)=wc+ce0(t), where wc is the free-running frequency
  • Example

EE 541/451 Fall 2006

ideal model
Ideal Model
  • Model
    • Si=Acos(wct+1(t)), Sv=Avcos(wct+c(t))
    • Sp=0.5AAv[sin(2wct+1+c)+sin(1-c)]
    • So=0.5AAvsin(1-c)=AAv(1-c)
  • Capture Range and Lock Range

LPF

VCO

EE 541/451 Fall 2006

carrier acquisition in dsb sc
Carrier Acquisition in DSB-SC
  • Signal Squaring method
    • Book page 187
  • Costas Loop
  • SSB-SC not working

EE 541/451 Fall 2006

pll applications
PLL Applications
  • Clock recovery: no pilot
  • Deskewing: circuit design
  • Clock generation: Direct Digital Synthesis
  • Spread spectrum:
  • Jitter Noise Reduction
  • Clock distribution

EE 541/451 Fall 2006

homework and lab demo
Homework and Lab Demo
  • 4.5.1
  • 4.6.1
  • Graduate student 4.5.5

EE 541/451 Fall 2006

project one
Project One
  • Nine channels from 100KHz. Each channel has 10KHz.
  • Filter design to get the desired band and transmit without interferencing other band (nine bandpass filters, passband 4K, stopband 5K)
  • Voice bandwidth 4KHz, your voice with length of 3 seconds
  • A=1; 50% AM, transmitter receiver in different files
  • Sample frequency for modulated data 400KHz, for baseband 22050Hz.
  • Both coherent and envelop decoders (not necessary RC).
  • Graduate student, SSB USB. Hilbert Transceivers
  • Ranking methods at class
    • Add all signals together, if others can hear you, you have one point

EE 541/451 Fall 2006

questions
Questions?

EE 541/451 Fall 2006