A Foundation in Digital Communication by Amos Lapidoth

By Amos Lapidoth

This intuitive but rigourous advent derives the middle result of electronic verbal exchange from first rules. concept, instead of criteria, motivates the engineering techniques, and key effects are said with all of the required assumptions. The publication emphasizes the geometric view, commencing with the internal product, the matched filter out for its computation, Parseval's theorem, the sampling theorem as an orthonormal growth, the isometry among passband signs and their baseband illustration, and the spectral-efficiency optimality of quadrature amplitude modulation (QAM). next chapters tackle noise, speculation checking out, Gaussian stochastic procedures, and the sufficiency of the matched filter out outputs. Uniquely, there's a therapy of white noise with no generalized features, and of the facility spectral density with no man made random jitters and random levels within the research of QAM. This systematic and insightful e-book, with over three hundred workouts, is perfect for graduate classes in electronic verbal exchange, and for a person asking 'why' and never simply 'how'.

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Proof. 2). 4 Applications There are numerous applications of the Cauchy-Schwarz Inequality. Here we only mention a few. The first relates the energy in the superposition of two signals to the energies of the individual signals. The result holds for both complex-valued and real-valued functions, and—as is our custom—we shall thus not make the range explicit. 1 (Triangle Inequality for L2 ). If u and v are in L2 , then �u + v�2 ≤ �u�2 + �v�2 . 21) Proof. 9): 2 �u + v�2 = �u + v� u + v� = �u� u� + �v� v� + �u� v� + �v� u� ≤ �u� u� + �v� v� + |�u� v�| + |�v� u�| 2 2 2 2 = �u�2 + �v�2 + 2|�u� v�| ≤ �u�2 + �v�2 + 2 �u�2 �v�2 �2 � = �u�2 + �v�2 � from which the result follows by taking square roots.

N} . 19) �u� � u�� � = 0� The reader is encouraged to verify that if u is orthogonal to v then so is αu. Also, u is orthogonal to v if, and only if, v is orthogonal to u. Finally every function is orthogonal to the all-zero function 0. Having judiciously defined orthogonality in L2 , we can now extend Pythagoras’s Theorem. 2 (A Pythagorean Theorem). If the n-tuple of vectors (u1 � . . � un ) in L2 is orthogonal, then 2 2 2 �u1 + · · · + un �2 = �u1 �2 + · · · + �un �2 . Proof. This theorem can be proved by induction on n.

It allows for the possibility that u is orthogonal to v, but that its scaled version αu is not. For example, with this definition, the function t �→ i I{|t| ≤ 5} is orthogonal to the function t �→ I{|t| ≤ 17} but its scaled (by α = i) version t �→ i i I{|t| ≤ 5} = − I{|t| ≤ 5} is not. , to the condition � ∞ u(t) v ∗ (t) dt = 0 α ∈ �. 16) −∞ (because if z ∈ � is such that Re(αz) = 0 for all α ∈ �, then z = 0). 6) �u� v� = �v� u� ) to the condition �v� u� = 0. 1 (Orthogonal Signals in L2 ). The signals u� v ∈ L2 are said to be orthogonal if �u� v� = 0.

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