Engineering topics

Lindsey, W. C.

Publications and source records attributed to Lindsey, W. C..

At least 73 records · Page 4

NASA NTRS1972

On the detection of differentially encoded polyphase signals.

Discussion of the transmission and detection of differentially encoded polyphase signals and of the ambiguity resolution problem which results from suppression of the transmitted carrier. In particular, an analysis is made of the performance of differentially encoded coherent multiple phase-shift keyed (MPSK) systems which reconstruct coherent reference signals by means of generalized Costas or nth-power loops. The performance of such systems is then compared with that of ideal reception of MPSK signals and differentially coherent detection of differentially encoded MPSK signals. Emphasis is placed upon the special cases of quadriphase and octaphase signaling.

Lindsey, W. C.↗

NASA NTRS1972

L-orthogonal signal transmission and detection.

Investigation of the detailed capabilities and performance characterization of systems that employ L-orthogonal signaling techniques. L-orthogonal signals represent a unified set of signals wherein the polyphase and orthogonal (bi-orthogonal) signal sets are included as special cases. This fact is important, since orthogonal (bi-orthogonal) and polyphase signaling sets represent opposing forces as far as tradeoffs between error probability, energy-to-noise ratio, and bandwidth requirements are concerned. Bounds on the performance of the optimum receiver and the performance of various suboptimum (practical) receiver structures are given. Coherent and differentially coherent detection of differentially encoded signals are also pursued. Various comparisons and tradeoffs are made by means of numerical evaluation of the error probability expressions.

Lindsey, W. C.↗

NASA NTRS1971

Data-aided carrier tracking loops

Tracking loops coherent reference signal with data aided demodulator, using power in modulation and carrier

Lindsey, W. C.↗

NASA NTRS1971

Two-way coherent tracking systems.

Review of some results pertinent to the development of nonlinear theory on two-way coherent tracking systems. In particular, the model of cascaded systems is presented, and approximations to steady state probability density functions of the two-way system phase and Doppler error are developed. From these, certain numerical results required in the design and planning of these systems are derived.

Lindsey, W. C.↗

NASA NTRS1970

Block-coded communications

Theory for block-coded telemetry systems is useful in testing performance of one- and two-way, phase-coherent telemetry systems when double-conversion, superheterodyne, phase-locked receiver, preceded by bandpass limiter is used to track carrier.

Lindsey, W. C.↗

NASA NTRS1970

The effect of loop stress on the performance of phase-coherent communication systems

Phase-coherent communication systems with phase locked loops for data detector synchronization, calculating noisy timing effects on detection efficiency

Lindsey, W. C.↗

NASA NTRS1970

Digital data transition tracking loop improves data reception

Transition tracking loop eliminates drifts, leakages, and instabilities inherent in analog filters. Major components are the phase detector, loop filter, voltage-controlled oscillator and timing logic.

Anderson, T. O.↗

NASA NTRS1970

The performance of suppressed carrier tracking loops in the presence of frequency detuning

Coherent reference for demodulating double sideband suppressed carrier /DSB-SC/ signals in presence of frequency detuning, using squaring or Costas loop

Lindsey, W. C.↗

NASA NTRS1970

Hybrid carrier and modulation tracking loops

Coherent receiver as hybrid carrier tracking loop consisting of standard phase locked and modified Costas loop

Lindsey, W. C.↗

NASA NTRS1969

Nonlinear analysis of generalized tracking systems.

Tracking systems synthesis and performance analysis based on continuous Markov processes theory, particularly Fokker-Planck equation

Lindsey, W. C.↗

NASA NTRS1969

Block-coded communications

Design of phase coherent, block-coded telemetry systems

Lindsey, W. C.↗

NASA NTRS1969

A theory for the design of one-way and two-way phase-coherent communication systems - Phase- coherent tracking systems

Network analysis of theoretical design of one-way and two-way phase coherent satellite communication systems

Lindsey, W. C.↗

NASA NTRS1969

Block coding for space communications.

Block coded telemetry systems design for phase coherent space communication employing double conversion superheterodyne phase locked receivers

Lindsey, W. C.↗

NASA NTRS1968

Subcarrier tracking methods and communication system design.

Coherent subcarrier reference signal generation for received signal demodulation, discussing error probabilities in telemetry space communication systems design

Didday, R. L.↗

NASA NTRS1968

Performance of phase-coherent receivers preceded by bandpass limiters.

Phase error probability distribution in communication systems where bandpass limiters precede RF carrier tracking loop

Lindsey, W. C.↗

NASA NTRS1968

On the theory of automatic phase control.

Automatic phase control theory, discussing methods of determining loop models and of analyzing systems

Lindsey, W. C.↗

NASA NTRS1968

Improved modulation and coding methods for space communication systems.

Modulation and coding methods for deep space communication systems requirements, noting decreased error probability in onboard data reduction

Heller, J. A.↗

NASA NTRS1968

Subcarrier tracking methods and communication system design.

Subcarrier tracking methods using Fokker-Planck apparatus, predicting performance of uncoded and block-coded communication systems

Lindsey, W. C.↗