Download e-book for kindle: Digital Communication Systems by Simon Haykin

By Simon Haykin

ISBN-10: 0471647357

ISBN-13: 9780471647355

Bargains the main entire, updated assurance on hand at the ideas of electronic communications. specializes in simple matters, pertaining to concept to perform anywhere attainable. various examples, labored out intimately, were incorporated to assist the reader increase an intuitive grab of the speculation. subject matters lined contain the sampling strategy, electronic modulation strategies, error-control coding, strong quantization for pulse-code modulation, coding speech at low bit radio, details theoretic innovations, coding and computing device communique. as the e-book covers a wide variety of themes in electronic communications, it may fulfill quite a few backgrounds and pursuits.

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The phase β (f) is measured in radians. 49) indicates that the gain α (f) and phase β (f) are, respectively, the real and imaginary parts of the (natural) logarithm of the transfer function H(f). 69 dB. As a means of specifying the constancy of the magnitude response |H(f)| or gain α (f) of a system, we use the notion of bandwidth. 13a. 13b. 13 Illustrating the definition of system bandwidth. (a) Low-pass system. (b) Band-pass system. 51), then we may associate with this gain a suitable phase β (f), such that the resulting filter has a causal impulse response that is zero for negative time.

52) Let the input x(t), impulse response h(t), and output y(t) be uniformly sampled at the rate (1/Δτ ) samples per second, so that we may put t = nΔ τ and τ = kΔ τ where k and n are integers and Δτ is the sampling period. 52) by the convolution sum y ( nΔ τ ) = N–1  h(kΔ τ )x ( nΔ τ – kΔ τ )Δ τ k=0 where N Δτ = Tf. 7 Transmission of Signals through Linear Time-Invariant Systems Weights w 0 Delay τ Delay τ w1 ... Sampled input x (n τ ) w2 w N –3 Delay τ w N –2 41 Delay τ w N –1 ... 14 Tapped-delay-line (TDL) filter; also referred to as FIR filter.

8. As T approaches zero, the rectangular pulse g(t) approaches the Dirac delta function δ (t) in the limit. For the delta function to have meaning, however, it has to appear as a factor in the integrand of an integral with respect to time, and then, strictly speaking, only when the other factor in the integrand is a continuous function of time. Let g(t) be such a function, and consider the product of g(t) and the time-shifted delta function δ (t – t0). 31) The operation indicated on the left-hand side of this equation sifts out the value g(t0) of the function g(t) at time t = t0, where – ∞ < t < ∞ .

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Digital Communication Systems by Simon Haykin

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