By Ha H. Nguyen, Ed Shwedyk

ISBN-10: 0521876133

ISBN-13: 9780521876131

Conversation expertise has develop into pervasive within the smooth global, and ever extra advanced. concentrating on the main easy principles, this rigorously paced, logically established textbook is choked with insights and illustrative examples, making this an excellent advent to fashionable electronic verbal exchange. Examples with step by step strategies support with the assimilation of theoretical principles, and MATLAB routines boost self assurance in utilizing mathematical techniques to real-world difficulties. correct from the beginning the authors use the sign area method of provide scholars an intuitive think for the modulation/demodulation approach. After a assessment of indications and random techniques, they describe center themes and methods reminiscent of resource coding, baseband transmission, modulation, and synchronization. The publication closes with assurance of complicated issues similar to trellis-coding, CMDA, and space-time codes to stimulate additional examine. this is often a great textbook for somebody who desires to find out about smooth electronic verbal exchange.

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**Additional info for A First Course in Digital Communications**

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7 Flip one set of coefficients, say Dk 2 , about the [s (t)] [s (t)] vertical axis to produce D−k2 . Then slide the coefficients D−k2 to the left or right by [s (t)] [s (t)] 2 the value of index m to get Dm−k . Multiply the set {Dk 1 [s(t)] [s (t)] 2 } by the set {Dm−k } point by point and sum the resultant products to obtain Dm . Repeat for another m. 15 illustrates the procedure with a simple toy example. Since convolution is a mathematical operation that tends to cause some difficulty when first encountered a comment is in order.

This occurs with Hilbert transforms for instance. 3 Fourier transform relationships for general signals, real or complex s(t) = ∞ −∞ ∞ S(f )ej2π ft df ←→ S(f ) = Operation −∞ s(t)e−j2πft dt s(t) S(f ) 1. 2. Superposition Time shifting αs1 (t) + βs2 (t) s(t − t0 ) 3. Time scaling s(at) 4. Time reversal Frequency-shifting Amplitude modulation 5. Time differentiation s(−t) s(t)ej2π fc t s(t) cos(2π fc t) dn s(t) dtn 6. Time integration 7. 8. 9. Time multiplication Time convolution Duality αS1 (f ) + βS2 (f ) S(f )e−j2πft0 1 f S |a| a S(−f ) S(f − fc ) 1 S(f − f ) + 1 S(f + f ) c c 2 2 (j2π f )n S(f ) t S(0) 1 S(f ) + δ(f ) j2πf 2 S1 (f ) ∗ S2 (f ) S1 (f )S2 (f ) s(−f ) s(λ)dλ −∞ s1 (t)s2 (t) s1 (t) ∗ s2 (t) S(t) Note: α and β are arbitrary constants, ∞ ∞ S1 (f ) ∗ S2 (f ) = −∞ S1 (λ)S2 (f − λ)dλ = −∞ S2 (λ)S1 (f − λ)dλ, ∞ ∞ s1 (t) ∗ s2 (t) = −∞ s1 (λ)s2 (t − λ)dλ = −∞ s2 (λ)s1 (t − λ)dλ.

21(a) shows the rectangular pulse. 63b) sin(π fT) , (π fT) 0, πsgn(f ), k T k T < |f | < < |f | < k+1 T , k+1 T , k even and ≥ 0 k odd and > 0 . 63c) Since s(t) is an even function, it only has a real component. However, observe that this does not mean that the phase is zero. It can be 0 or ±π depending on whether the real component is positive or negative. 4 Nonperiodic signals ⎡ ⎛ T ⎞ ⎛ T ⎞⎤ s(t) = V ⎢u ⎜ t + ⎟ –u ⎜t – ⎟ ⎥ ⎣ ⎝ 2 ⎠ ⎝ 2 ⎠⎦ (V) V – 0 T 2 t (s) T 2 (a) k k+1 , k even and ≥ 0 < f < 0, ⎧ T T ∠S( f ) = ⎨ k k+1 ⎩πsgn( f ), T < f < T , k odd and > 0 (rad/Hz) +π – 5 T – 4 T – 3 T – 2 T – 1 T 0 1 T 2 T 3 T 4 T f (Hz) 5 T –π (b) S( f ) = VT sin(π f T ) πf T (V/Hz) VT – – t Fig.

### A First Course in Digital Communications by Ha H. Nguyen, Ed Shwedyk

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