Showing papers on "Orthogonal frequency-division multiplexing published in 1966"
TL;DR: A new technique for multiplex communication is described, in which orthogonal pulse waveforms are transmitted as simultaneous subcarriers, which offers the advantages of high spectrum efficiency, maximum rejection of crosstalk and noise, and modular flexibility.
Abstract: A new technique for multiplex communication is described, in which orthogonal pulse waveforms are transmitted as simultaneous subcarriers. Information signals are carried in the form of independent amplitude modulations of each subcarrier, and are extracted by means of waveform correlation. Known as ORTHOMUX (orthogonal multiplexing), the new technique offers the advantages of: 1) high spectrum efficiency, 2) maximum rejection of crosstalk and noise, 3) information response down to zero frequency, 4) mixed information rates, 5) simple, compact equipment, and 6) modular flexibility.
3 citations
26 Oct 1966
TL;DR: Models and transformations for combinational networks, algebraic model, Synthesis of testable network, algorithm for delay evaluation and optimization, rule based system for logic optimization, Multiple Level Combinational Optimizations.
Abstract: Linear equations: Fields; system of linear equations, and its solution sets; elementary row operations and echelon forms; matrix operations; invertible matrices, LU-factorization. Multiple Level Combinational Optimizations: Models and transformations for combinational networks, algebraic model, Synthesis of testable network, algorithm for delay evaluation and optimization, rule based system for logic optimization. Digital Control Systems: Review of difference equations and Z — transforms, Z-transfer function (Pulse transfer function), Z.-. Transforms analysis sampled data systems, Stability analysis (Jury's Stability Test and Bilinear Transformation), Pulse transfer functions and different configurations for closed loop Discrete-time control systems Modern Control Theory: I, State model for continuous time and discrete time systems, Solutions of state equations (for both continuous and discrete systems), Concepts of controllability and observability (For both continuous and discrete systems), Pole Placement by state feedback (for both continuous and discrete systems), Full order and reduced order observes (for both continuous and discrete systems), Dead beat control by state feedback, Optimal control problems using state variable approach, Control of Networks-QoS, static and dynamic routing, Markov chains, queueing models, Bellman Ford and Dijkstra's algorithms, window and rate congestion control, large deviations of a queue and network, open and closed loop flow control, control of ATM networks. Fundamentals of Multi-rate Systems: Basic multi-rate operations, interconnection of building blocks, poly-phase representation, multistage implementation, applications of multi-rate systems, special filters and filter banks. Multirate Filter Banks: (i) Maximally decimated filter banks: Errors created in the QMF bank, alias-free QMF system, power symmetric QMF banks, M-channel filter banks, poly-phase representation, perfect reconstruction systems, alias-free filter banks, tree structured filter banks, trans-multiplexers. (ii) Para-unitary Perfect Reconstruction Filter Banks: Lossless transfer matrices, filter bank properties induced by paraunitariness, two channel Para-unitary lattices, M-channel FIR Para-unitary QMF banks, transform coding. (iii) Linear Phase Perfect Reconstruction QMF Banks: Necessary conditions, lattice structures for linear phase FIR PR QMF banks, formal synthesis of linear phase FIR PR QMF lattice. (iv)Cosine Modulated Filter Banks: Pseudo-QMF bank and its design, efficient poly-phase structures, properties of cosine matrices, cosine modulated perfect reconstruction systems. 13 Wavelet Transform: Short-time Fourier transform, Wavelet transform, discrete-time Ortho-normal wavelets, continuous-time Ortho-normal wavelets. Processor and Memory Organization: Structural unit in as processor, processor selection for an embedded systems. Memory devices, memory selection for an embedded system, allocation of memory to program statements and blocks and memory map of a system. Direct memory accesses. driver in a system, serial port device driver in a system, …
2 citations
1 citations
01 Sep 1966
TL;DR: Multiple access techniques for communications satellites - digital modulation, time division multiplexing, and related signal processing - are discussed in detail in this paper, where the authors present a detailed discussion of their work.
Abstract: Multiple access techniques for communications satellites - digital modulation, time division multiplexing, and related signal processing