John Liebetreu - Academia.edu (original) (raw)

Papers by John Liebetreu

1997 IEEE International Solids-State Circuits Conference. Digest of Technical Papers, 1997

A two-chip set integrates all functions required to demodulate and decode a 480 Mhz QPSK signal a... more A two-chip set integrates all functions required to demodulate and decode a 480 Mhz QPSK signal at data rates from 10 to 85 Mb/s. By optimizing the system as a whole and exploiting feedback between the two chips implementation is efficient and cost-effective.

Purpose Notice This document has been prepared to assist IEEE 802.16. It is offered as a basis fo... more Purpose Notice This document has been prepared to assist IEEE 802.16. It is offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to cha nge in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein. Release The contributor grants a free, irrevocable license to the IEEE to incorporate material contained in this contribution, and any modifications thereof, in the creation of an IEEE Standards publication; to copyright in the IEEE’s name any IEEE Standards publication even though it may include portions of this contribution; and at the IEEE’s sole discretion to permit others to reproduce in whole or in part the resulting IEEE Standards publication. The contributor also acknowledges and accepts that this contribution may be made public by IEEE 802.16. Patent Policy and

In response to Call for Suggested Improvements and Mergers

Purpose Notice This document has been prepared to assist IEEE 802.16. It is offered as a basis fo... more Purpose Notice This document has been prepared to assist IEEE 802.16. It is offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein. Release The contributor grants a free, irrevocable license to the IEEE to incorporat e material contained in this contribution, and any modifications thereof, in the creation of an IEEE Standards publication; to copyright in the IEEE’s name any IEEE Standards publication even though it may include portions of this contribution; and at the IEEE’s sole discretion to permit others to reproduce in whole or in part the resulting IEEE Standards publication. The contributor also acknowledges and accepts that this contribution may be made public by IEEE 802.16. Patent Policy and

Purpose To be used as baseline for OFDM FFT-256 modifications for mobile operation Notice This do... more Purpose To be used as baseline for OFDM FFT-256 modifications for mobile operation Notice This document has been prepared to assist IEEE 802.16. It is offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein. Release The contributor grants a free, irrevocable license to the IEEE to incorporate material contained in this contribution, and any modifications thereof, in the creation of an IEEE Standards publication; to copyright in the IEEE’s name any IEEE Standards publication even though it may include portions of this contribution; and at the IEEE’s sole discretion to permit others to reproduce in whole or in part the resulting IEEE Standards publication. The contributor also acknowledges and accepts that this contribution may be made public by IEEE 802...

This proposed PHY addresses the criteria in the Evaluation Table of the cited Call for Contributi... more This proposed PHY addresses the criteria in the Evaluation Table of the cited Call for Contributions with a flexibly scalable structure based on existing wireless standards, which can efficiently respond to the 802.16.3 Functional Requirements Document and support cost-effective implementations over alternative PHY structures. Purpose This document is proposed for consideration by the 802.16.3 Task Group as the 2-11 GHz Licensed Band FWA PHY solution. Notice This document has been prepared to assist IEEE 802.16. It is offered as a basis for discussion and is not binding on the contributing individuals or organization. The material in this document is subject to change in form and content after further study. The contributors reserve the right to add, amend or withdraw material contained herein. Release The contributor grants a free, irrevocable license to the IEEE to incorporate text contained in this contribution, and any modifications thereof, in the creation of an IEEE Standards ...

document IEEE 802.16.3-00/24, dated 2000-12-02. Abstract This proposed PHY addresses the criteria... more document IEEE 802.16.3-00/24, dated 2000-12-02. Abstract This proposed PHY addresses the criteria in the Evaluation Table of the cited Call for Contributions with a flexibly scalable structure based on existing wireless standards, which can efficiently respond to the 802.16.3 Functional Requirements Document and support costeffective implementations over alternative PHY structures.

Since its founding, NASA has been dedicated to the advancement of aeronautics and space science. ... more Since its founding, NASA has been dedicated to the advancement of aeronautics and space science. The NASA Scientific and Technical Information (STI) program plays a key part in helping NASA maintain this important role. The NASA STI Program operates under the auspices of the Agency Chief Information Officer. It collects, organizes, provides for archiving, and disseminates NASA’s STI. The NASA STI program provides access to the NASA Aeronautics and Space Database and its public interface, the NASA Technical Reports Server, thus providing one of the largest collections of aeronautical and space science STI in the world. Results are published in both non-NASA channels and by NASA in the NASA STI Report Series, which includes the following report types: • TECHNICAL PUBLICATION. Reports of completed research or a major significant phase of research that present the results of NASA programs and include extensive data or theoretical analysis. Includes compilations of significant scientific...

Multi-parameter estimation theory is applied to multi-h continuous phase modulation signals to pr... more Multi-parameter estimation theory is applied to multi-h continuous phase modulation signals to produce self-synchronizing receiver structures for successful operation in the presence of additive white Gaussian noise. Carrier phase synchronization and symbol timing clock recovery are treated as separate issues. Two MAP sequence estimation structures are developed and tested in a computer simulation to track a normal random walk carrier phase jitter process in conjunction with data symbol decoding by means of the Viterbi algorithm. A maximum likelihood estimation structure is developed for delayed tracking of the symbol timing clock in the absence of random carrier phase jitter --Abstract, page ii

Cette invention concerne un modulateur pragmatique (28) code en treillis . Ce modulateur comprend... more Cette invention concerne un modulateur pragmatique (28) code en treillis . Ce modulateur comprend: un circuit d'analyse (48) convertissant les bits d'information entrants (30) en bits d'information non codes (51) et en bits d'information a coder (53); un circuit de codage convolutionnel (62) pour la conversion convolutionnelle de chacun des bits d'information a coder traites ici par intervalle de temps et un circuit de mappage (68) pour la mise en correspondance des bits non codes et des bits a codage convolutionnel dans le but d'obtenir un signal en quadrature definissant les points de phase mappes.

2000 IEEE Wireless Communications and Networking Conference. Conference Record (Cat. No.00TH8540), 2000

This document addresses several aspects of block turbo codes (BTC) and higher order modulations, ... more This document addresses several aspects of block turbo codes (BTC) and higher order modulations, selected as the optional coding scheme for the burst modes of the IEEE 802.16.1, air interface draft standard. Compatibility, with mandatory burst modes (MODE B downstream and upstream transmissions), includes the same processes for the transmission convergence (TC) layer and physical media dependent (PMD) layer. However,

Re: The document supports a comment in 802.16REVd Sponsor Ballot

This paper describes a radio equipment “signature,” a means of comparing different digital radio ... more This paper describes a radio equipment “signature,” a means of comparing different digital radio designs in their sensitivity to multipath fading, and reviews the concept of DFM, dispersive fade margin, as a measure of the expected outage due to selective fading. Since dispersive fade margin accounts for all contributions to sensitivity of a digital radio operating in a frequency-selective fading environment, it provides an ideal metric for comparing digital radios with one another. Purpose The radio equipment signature, described in this document is proposed for consideration as a performance metric to facilitate comparison of different digital radio designs, each of which may comply with emerging air interface standards. Although different radios may each be standards-compliant, applying performance metrics such as DFM and radio signatures such as those identified herein will provide a valuable discriminant among vendor offerings. Notice This document has been prepared to assist t...

The National Aeronautics and Space A d m i n i s t r a t i o n (NASA) is developing a standardize... more The National Aeronautics and Space A d m i n i s t r a t i o n (NASA) is developing a standardized platform for future space communications needs, based on software-defined radio (SDR) concepts. The goal is to have a system that does not require a complete custom hardware/software design for each mission. Instead, NASA desires an adaptable and scalable system that can accommodate the performance demands of many different radio systems. In addition, the hardware/software architecture is intended to protect the intellectual property rights of contractors regarding the internal operation of the portions of the system they provide.

This report defines a hardware architecture approach for software-defined radios to enable common... more This report defines a hardware architecture approach for software-defined radios to enable commonality among NASA space missions. The architecture accommodates a range of reconfigurable processing technologies including general-purpose processors, digital signal processors, field programmable gate arrays, and application-specific integrated circuits (ASICs) in addition to flexible and tunable radiofrequency front ends to satisfy varying mission requirements. The hardware architecture consists of modules, radio functions, and interfaces. The modules are a logical division of common radio functions that compose a typical communication radio. This report describes the architecture details, the module definitions, the typical functions on each module, and the module interfaces. Tradeoffs between component-based, custom architecture and a functional-based, open architecture are described. The architecture does not specify a physical implementation internally on each module, nor does the ...

IEEE Transactions on Communications

A dynamic programming algorithm, developed in [1]-[4] for obtaining the joint estimate of carrier... more A dynamic programming algorithm, developed in [1]-[4] for obtaining the joint estimate of carrier phase and data, is applied to multih continuous phase modulation. A MAP estimator detects data and jointly tracks carrier phase consisting of a normal random walk ptiase jitter process. Monte Carlo computer simulations are used to evaluate the probability of error performance for two receivers employed in demodulation of multi-h CPM signals. A simplified algorithm is proposed which yields up to a tenfold reduction in computation time at the expense of less than 1 dB in signal-to-noise ratio at the error rates computed, and for suitable ranges of phase jitter increments variance.

MILCOM 1986 - IEEE Military Communications Conference: Communications-Computers: Teamed for the 90's

IEEE Region 5 Conference, 1988: 'Spanning the Peaks of Electrotechnology'

1997 IEEE International Solids-State Circuits Conference. Digest of Technical Papers, 1997

A two-chip set integrates all functions required to demodulate and decode a 480 Mhz QPSK signal a... more A two-chip set integrates all functions required to demodulate and decode a 480 Mhz QPSK signal at data rates from 10 to 85 Mb/s. By optimizing the system as a whole and exploiting feedback between the two chips implementation is efficient and cost-effective.

Purpose Notice This document has been prepared to assist IEEE 802.16. It is offered as a basis fo... more Purpose Notice This document has been prepared to assist IEEE 802.16. It is offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to cha nge in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein. Release The contributor grants a free, irrevocable license to the IEEE to incorporate material contained in this contribution, and any modifications thereof, in the creation of an IEEE Standards publication; to copyright in the IEEE’s name any IEEE Standards publication even though it may include portions of this contribution; and at the IEEE’s sole discretion to permit others to reproduce in whole or in part the resulting IEEE Standards publication. The contributor also acknowledges and accepts that this contribution may be made public by IEEE 802.16. Patent Policy and

In response to Call for Suggested Improvements and Mergers

Purpose Notice This document has been prepared to assist IEEE 802.16. It is offered as a basis fo... more Purpose Notice This document has been prepared to assist IEEE 802.16. It is offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein. Release The contributor grants a free, irrevocable license to the IEEE to incorporat e material contained in this contribution, and any modifications thereof, in the creation of an IEEE Standards publication; to copyright in the IEEE’s name any IEEE Standards publication even though it may include portions of this contribution; and at the IEEE’s sole discretion to permit others to reproduce in whole or in part the resulting IEEE Standards publication. The contributor also acknowledges and accepts that this contribution may be made public by IEEE 802.16. Patent Policy and

Purpose To be used as baseline for OFDM FFT-256 modifications for mobile operation Notice This do... more Purpose To be used as baseline for OFDM FFT-256 modifications for mobile operation Notice This document has been prepared to assist IEEE 802.16. It is offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein. Release The contributor grants a free, irrevocable license to the IEEE to incorporate material contained in this contribution, and any modifications thereof, in the creation of an IEEE Standards publication; to copyright in the IEEE’s name any IEEE Standards publication even though it may include portions of this contribution; and at the IEEE’s sole discretion to permit others to reproduce in whole or in part the resulting IEEE Standards publication. The contributor also acknowledges and accepts that this contribution may be made public by IEEE 802...

This proposed PHY addresses the criteria in the Evaluation Table of the cited Call for Contributi... more This proposed PHY addresses the criteria in the Evaluation Table of the cited Call for Contributions with a flexibly scalable structure based on existing wireless standards, which can efficiently respond to the 802.16.3 Functional Requirements Document and support cost-effective implementations over alternative PHY structures. Purpose This document is proposed for consideration by the 802.16.3 Task Group as the 2-11 GHz Licensed Band FWA PHY solution. Notice This document has been prepared to assist IEEE 802.16. It is offered as a basis for discussion and is not binding on the contributing individuals or organization. The material in this document is subject to change in form and content after further study. The contributors reserve the right to add, amend or withdraw material contained herein. Release The contributor grants a free, irrevocable license to the IEEE to incorporate text contained in this contribution, and any modifications thereof, in the creation of an IEEE Standards ...

document IEEE 802.16.3-00/24, dated 2000-12-02. Abstract This proposed PHY addresses the criteria... more document IEEE 802.16.3-00/24, dated 2000-12-02. Abstract This proposed PHY addresses the criteria in the Evaluation Table of the cited Call for Contributions with a flexibly scalable structure based on existing wireless standards, which can efficiently respond to the 802.16.3 Functional Requirements Document and support costeffective implementations over alternative PHY structures.

Since its founding, NASA has been dedicated to the advancement of aeronautics and space science. ... more Since its founding, NASA has been dedicated to the advancement of aeronautics and space science. The NASA Scientific and Technical Information (STI) program plays a key part in helping NASA maintain this important role. The NASA STI Program operates under the auspices of the Agency Chief Information Officer. It collects, organizes, provides for archiving, and disseminates NASA’s STI. The NASA STI program provides access to the NASA Aeronautics and Space Database and its public interface, the NASA Technical Reports Server, thus providing one of the largest collections of aeronautical and space science STI in the world. Results are published in both non-NASA channels and by NASA in the NASA STI Report Series, which includes the following report types: • TECHNICAL PUBLICATION. Reports of completed research or a major significant phase of research that present the results of NASA programs and include extensive data or theoretical analysis. Includes compilations of significant scientific...

Multi-parameter estimation theory is applied to multi-h continuous phase modulation signals to pr... more Multi-parameter estimation theory is applied to multi-h continuous phase modulation signals to produce self-synchronizing receiver structures for successful operation in the presence of additive white Gaussian noise. Carrier phase synchronization and symbol timing clock recovery are treated as separate issues. Two MAP sequence estimation structures are developed and tested in a computer simulation to track a normal random walk carrier phase jitter process in conjunction with data symbol decoding by means of the Viterbi algorithm. A maximum likelihood estimation structure is developed for delayed tracking of the symbol timing clock in the absence of random carrier phase jitter --Abstract, page ii

Cette invention concerne un modulateur pragmatique (28) code en treillis . Ce modulateur comprend... more Cette invention concerne un modulateur pragmatique (28) code en treillis . Ce modulateur comprend: un circuit d'analyse (48) convertissant les bits d'information entrants (30) en bits d'information non codes (51) et en bits d'information a coder (53); un circuit de codage convolutionnel (62) pour la conversion convolutionnelle de chacun des bits d'information a coder traites ici par intervalle de temps et un circuit de mappage (68) pour la mise en correspondance des bits non codes et des bits a codage convolutionnel dans le but d'obtenir un signal en quadrature definissant les points de phase mappes.

2000 IEEE Wireless Communications and Networking Conference. Conference Record (Cat. No.00TH8540), 2000

This document addresses several aspects of block turbo codes (BTC) and higher order modulations, ... more This document addresses several aspects of block turbo codes (BTC) and higher order modulations, selected as the optional coding scheme for the burst modes of the IEEE 802.16.1, air interface draft standard. Compatibility, with mandatory burst modes (MODE B downstream and upstream transmissions), includes the same processes for the transmission convergence (TC) layer and physical media dependent (PMD) layer. However,

Re: The document supports a comment in 802.16REVd Sponsor Ballot

This paper describes a radio equipment “signature,” a means of comparing different digital radio ... more This paper describes a radio equipment “signature,” a means of comparing different digital radio designs in their sensitivity to multipath fading, and reviews the concept of DFM, dispersive fade margin, as a measure of the expected outage due to selective fading. Since dispersive fade margin accounts for all contributions to sensitivity of a digital radio operating in a frequency-selective fading environment, it provides an ideal metric for comparing digital radios with one another. Purpose The radio equipment signature, described in this document is proposed for consideration as a performance metric to facilitate comparison of different digital radio designs, each of which may comply with emerging air interface standards. Although different radios may each be standards-compliant, applying performance metrics such as DFM and radio signatures such as those identified herein will provide a valuable discriminant among vendor offerings. Notice This document has been prepared to assist t...

The National Aeronautics and Space A d m i n i s t r a t i o n (NASA) is developing a standardize... more The National Aeronautics and Space A d m i n i s t r a t i o n (NASA) is developing a standardized platform for future space communications needs, based on software-defined radio (SDR) concepts. The goal is to have a system that does not require a complete custom hardware/software design for each mission. Instead, NASA desires an adaptable and scalable system that can accommodate the performance demands of many different radio systems. In addition, the hardware/software architecture is intended to protect the intellectual property rights of contractors regarding the internal operation of the portions of the system they provide.

This report defines a hardware architecture approach for software-defined radios to enable common... more This report defines a hardware architecture approach for software-defined radios to enable commonality among NASA space missions. The architecture accommodates a range of reconfigurable processing technologies including general-purpose processors, digital signal processors, field programmable gate arrays, and application-specific integrated circuits (ASICs) in addition to flexible and tunable radiofrequency front ends to satisfy varying mission requirements. The hardware architecture consists of modules, radio functions, and interfaces. The modules are a logical division of common radio functions that compose a typical communication radio. This report describes the architecture details, the module definitions, the typical functions on each module, and the module interfaces. Tradeoffs between component-based, custom architecture and a functional-based, open architecture are described. The architecture does not specify a physical implementation internally on each module, nor does the ...

IEEE Transactions on Communications

A dynamic programming algorithm, developed in [1]-[4] for obtaining the joint estimate of carrier... more A dynamic programming algorithm, developed in [1]-[4] for obtaining the joint estimate of carrier phase and data, is applied to multih continuous phase modulation. A MAP estimator detects data and jointly tracks carrier phase consisting of a normal random walk ptiase jitter process. Monte Carlo computer simulations are used to evaluate the probability of error performance for two receivers employed in demodulation of multi-h CPM signals. A simplified algorithm is proposed which yields up to a tenfold reduction in computation time at the expense of less than 1 dB in signal-to-noise ratio at the error rates computed, and for suitable ranges of phase jitter increments variance.

MILCOM 1986 - IEEE Military Communications Conference: Communications-Computers: Teamed for the 90's

IEEE Region 5 Conference, 1988: 'Spanning the Peaks of Electrotechnology'