0195136047.pdf

654 SIGNAL PROCESSING Figure 14.3.6(a), in block diagram form, illustrates a thermal noise source connected to a matched two-por ...

14.3 INTERFERENCE AND NOISE 655 SNR= Pout Nout = GPin Gk(T+Ta)B = Pin k(T+Ta)B (14.3.10) where the amplified signal power isPout ...

656 SIGNAL PROCESSING works as a phase modulator for high-frequency components, a better overall system performance results comp ...

14.3 INTERFERENCE AND NOISE 657 1 f − 5 f 0 − 4 f 0 − 3 f 0 − 2 f 0 −f 0 0 f 0 2 f 0 3 f 0 4 f 0 5 f 0 (a) 1 + f^2 f 02 |Hp(f)| ...

658 SIGNAL PROCESSING as alock-in amplifier.For extracting information from signals deeply buried in noise, more sophisticated m ...

PROBLEMS 659 Applications could conceivably extend to people residing near airports and bothered by airplane takeoffs and landin ...

660 SIGNAL PROCESSING sgn(t)=    1 ,t> 0 − 1 t< 0 0 ,t= 0 which can be expressed as the limit of the signalxn(t) define ...

PROBLEMS 661 (c) x 3 (t)= {t |t|,t=^0 0 ,t= 0 *14.1.6For the following neither even nor odd signals, find the even and odd part ...

662 SIGNAL PROCESSING x(t) x(t) T − 4 T − 2 T 4 T 2 (a) (b) −T e−t T t 2 T 1 −T T t 1 − 1 x(t) (c) t 1 2 2 T 3 T x(t) (d) T 3 t ...

PROBLEMS 663 − 3 t T/2 T −T/2 T/4 −T/4 T/2 T/2 0 3 − 2 (a) 2 t 0 − 4 (b) 4 8 0 T t (c) 6 − 6 Figure P14.1.15 10 kHz, withK=1, fi ...

664 SIGNAL PROCESSING 14.2.5Repeat Problem 14.2.4 whenfm=1 kHz,f= 0, andφ=90°. 14.2.6(a) Consider Figure 14.2.5, in which the ...

PROBLEMS 665 14.3.4(a) The transfer function of a notch filter is given byH(jω)=( 100 +jω−ω^2 )/( 10 +jω)^2. SketchHdBversusω. ( ...

15 Communication Systems 15.1 Waves, Transmission Lines, Waveguides, and Antenna Fundamentals 15.2 Analog Communication Systems ...

Communication Systems 667 invention of the vacuum tube was particularly instrumental in the development of radio commu- nication ...

668 COMMUNICATION SYSTEMS Designation Transmission media Applications 1015 Hz 1015 Hz 10 −^6 m Ultraviolet Visible light Experim ...

Communication Systems 669 Ground-wave propagation Sky-wave propagation Line-of-sight (LOS) propagation. In the frequency bands ...

670 COMMUNICATION SYSTEMS transmitting in the VHF and UHF bands have their antennas mounted on high towers to achieve a broad co ...

15.1 WAVES, TRANSMISSION LINES, WAVEGUIDES, AND ANTENNA FUNDAMENTALS 671 used to connect some television antennas. The coaxial c ...

672 COMMUNICATION SYSTEMS (transverse) to the direction of propagation, which is along the axial line. That is to say, no electr ...

15.1 WAVES, TRANSMISSION LINES, WAVEGUIDES, AND ANTENNA FUNDAMENTALS 673 and current are given by v 2 (t)=v 1 (t−tl) (15.1.5) i ...