Bernard Sklar - Academia.edu (original) (raw)

Papers by Bernard Sklar

MILCOM 97 MILCOM 97 Proceedings

Part I of a two-part overview of digital communications. A N IMPRESSIVE assortment of communicati... more Part I of a two-part overview of digital communications. A N IMPRESSIVE assortment of communications signal processing techniques has arisen during the past two decades. This two-part paper presents an overview of some of these techniques, particularly as they relate to digital satellite communications. The material is developed in the context of a structure used to trace the processing steps from the information source to the informa-tion sink. Transformations are organized according to functional classes: formatting and source coding, modulation, channel coding, multiplexing and multiple access, frequency spreading, encryption, and synchronization. The paper begins by treating formatting, source coding, modulation, and potential trade-offs for power-limited systems ' and bandwidth-limited systems. Communications via satellites have two unique charac-teristics: the ability to cover the globe with a flexibility that

class of error-correcting codes that are now called Reed-Solomon (R-S) codes. These codes have gr... more class of error-correcting codes that are now called Reed-Solomon (R-S) codes. These codes have great power and utility, and are today found in many

Concatenated coding schemes were first proposed by Forney [1] as a method for achieving large cod... more Concatenated coding schemes were first proposed by Forney [1] as a method for achieving large coding gains by combining two or more relatively simple buildingblock or component codes (sometimes called constituent codes). The resulting codes had the error-correction capability of much longer codes, and they were endowed with a structure that permitted relatively easy to moderately complex decoding. A serial concatenation of codes is most often used for power-limited systems such as transmitters on deep-space probes. The most popular of these schemes consists of a Reed-Solomon outer (applied first, removed last) code followed by a convolutional inner (applied last, removed first) code [2]. A turbo code can be thought of as a refinement of the concatenated encoding structure plus an iterative algorithm for decoding the associated code sequence.

This article is intended to serve as a “road map” for outlining typical steps to be considered in... more This article is intended to serve as a “road map” for outlining typical steps to be considered in meeting the bandwidth, power, and error-performance requirements of a digital communication system. The criteria for choosing modulation and coding schemes, based on whether a system is bandwidth-limited or power-limited, are reviewed for several system examples, and the article emphasizes the subtle but straightforward relationships that exist when transforming from data bits to channel bits to symbols to chips.

Because it is analytically straightforward, link budget analysis often takes a back seat in engin... more Because it is analytically straightforward, link budget analysis often takes a back seat in engineering curricula, yet this technique represents one of the most important tools available to communications engineers and managers. This paper presents a tutorial examination of link budget development, with an emphasis on satellite communications systems, and catalogues the typical sources of loss and noise. In addition, it treats the concepts of the range equation, free space, antenna gain and effective area, system temperature, and digital versus analog parameters. This paper also illustrates a typical budget and tradeoffs using a communication satellite example.

MILCOM 88, 21st Century Military Communications - What's Possible?'. Conference record. Military Communications Conference

... Signal '"1 E ffl c1 enty I Kodulatlon ibltlbaud) Maximum Signaling B it Rate Rite v... more ... Signal '"1 E ffl c1 enty I Kodulatlon ibltlbaud) Maximum Signaling B it Rate Rite vear ME 1 m m 1962 Bell 201 2400 1200 4-PSI 2 1967 Hilgo 4400148 4800 1600 8-PSI 3 1971 Codex 9600C 9600 2400 I ... Rule 1 follows our intuition that good codes should have a regular structure ...

20th AIAA International Communication Satellite Systems Conference and Exhibit, 2002

Electrical Engineering Handbook, 2012

Journal of Speech and Hearing Disorders, 1969

Link budget development is discussed, with emphasis placed on satellite communication systems and... more Link budget development is discussed, with emphasis placed on satellite communication systems and the typical sources of loss and noise. The concepts of the range equation, free space, antenna gain and effective area, system temperature, and digital versus analog parameters are analyzed. A typical budget and tradeoffs are illustrated using a communication satellite example.