Surface wave recirculation loops for signal processing

Morgan, D.P.; Hannah, John

doi:10.1109/t-su.1978.30982

Cited by 7 publications

(41 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…These binary operations are defined by 0 ⊕ 0 = 0, 0 ⊕ 1 = 1, 1 ⊕ 0 = 1, 1 ⊕ 1 = 0 0 · 0 = 0, 0 · 1 = 0, 1 · 0 = 0, 1 · 1 = 1 (2)(3)(4)(5)(6)(7)(8)(9)(10)(11) where ⊕ denotes modulo-2 addition. From these equations, it is easy to verify that the field is closed under both modulo-2 addition and modulo-2 multiplication and that both operations are associative and commutative.…”

Section: Shift-register Sequencesmentioning

confidence: 99%

“…Since −1 is defined as that element which when added to 1 yields 0, we have −1 = 1, and subtraction is the same as addition. From (2)(3)(4)(5)(6)(7)(8)(9)(10)(11), it follows that the additive identity element is 0, the multiplicative identity is 1, and the multiplicative inverse of 1 is 1 −1 = 1. The substitutions of all possible symbol combinations verify the distributive laws:…”

Section: Shift-register Sequencesmentioning

confidence: 99%

“…Substitution of (2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14) into this equation yields Thus, the generating function of the output sequence generated by a linear feedback shift register with characteristic polynomial f (x) may be expressed in the form G(x) = φ(x)/f (x), where the degree of φ(x) is less than the degree of f (x). The output sequence is said to be generated by f (x).…”

Section: Polynomials Over the Binary Fieldmentioning

confidence: 99%

“…Since E[n(t)] = 0, (3)(4)(5)(6)(7)(8)(9)(10)(11)(12) implies that E[V 2 ] = 0. A straightforward calculation using (3)(4)(5)(6)(7)(8)(9), (3)(4)(5)(6)(7)(8)(9)(10)(11)(12), (3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13), the limited duration of ψ(t), and f c >> 1/T c yields…”

Section: Systems With Coherent Psk and Random Spreading Sequencesmentioning

confidence: 99%

“…otherwise (3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20) Let k 1 denote the number of chips in [0, T s ] for which p i = +1; the number for which -19), (1)(2)(3), and (3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20) yield…”

Section: Tone Interference At Carrier Frequencymentioning

confidence: 99%

See 4 more Smart Citations

Direct-Sequence Communication Systems

Torrieri¹

2004

View full text Add to dashboard Cite

Approved for public release; distribution unlimited. ii REPORT DOCUMENTATION PAGEForm Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing the burden, to Department of Defense, Washington Headquarters Services, Directorate for Information Operations and Reports (0704-0188), 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to any penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number. PLEASE DO NOT RETURN YOUR FORM TO THE ABOVE ADDRESS. REPORT DATE (DD-MM-YYYY) March 2004 REPORT TYPE ARL-TR-3175 SPONSOR/MONITOR'S ACRONYM(S) 9. SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES)U.S. Army Research Laboratory 2800 Powder Mill Road Adelphi, MD 20783-1197 SPONSOR/MONITOR'S REPORT NUMBER(S) DISTRIBUTION/AVAILABILITY STATEMENTApproved for public release; distribution unlimited. SUPPLEMENTARY NOTES ABSTRACTThis report presents a comprehensive review of the state of the art of direct-sequence communication systems. Although it is largely self-contained mathematically, the report presumes a thorough understanding of modern digital communications. To limit the report to approximately 200 pages, only the most vital aspects of the theory are emphasized, but the cited references provide many details and minor topics. SUBJECT TERMS PrefaceThis report presents a comprehensive review of the state of the art of direct-sequence communication systems. Although it is largely self-contained mathematically, the report presumes a thorough understanding of modern digital communications. To limit the report to approximately 200 pages, only the most vital aspects of the theory are emphasized, but the cited references provide many details and minor topics. Sections 1 and 2 cover the basic definitions and concepts and the fundamental properties of spreading sequences. Sections 3 and 4 derive the symbol error probabilities of coherent systems in the presence of tone or Gaussian interference. Methods of suppressing pulsed interference are analyzed in Section 5. In Section 6, the role of matched filters in direct-sequence systems is examined. Code synchronization, which is the most significant issue in the design of direct-sequence systems, is analyzed in Section 7. Several supplementary methods of rejecting narrowband interference are presented in Section 8. The detection of the existence of a direct-sequence signal by both an ideal receiver and the more practical wideband radiometer are analyzed in Section 9. Section 10 explains and develops the theory of direct-sequence code-division multi...

show abstract

Section: Shift-register Sequencesmentioning

confidence: 99%

Section: Shift-register Sequencesmentioning

confidence: 99%

Section: Polynomials Over the Binary Fieldmentioning

confidence: 99%

Section: Systems With Coherent Psk and Random Spreading Sequencesmentioning

confidence: 99%

Section: Tone Interference At Carrier Frequencymentioning

confidence: 99%

See 3 more Smart Citations

Direct-Sequence Communication Systems

Torrieri¹

2004

View full text Add to dashboard Cite

show abstract

Principle and application of ball SAW devices

Yamanaka¹,

Nakaso²,

Fukiura³

et al. 2009

Electrical Engineering Japan

View full text Add to dashboard Cite

SUMMARYA thin beam of waves usually diverges due to diffraction, which is a limitation of any device using such waves. However, a surface acoustic wave (SAW) on a sphere with an appropriate aperture does not diverge but is collimated, realizing ultra-multiple roundtrips along an equator of the sphere. This effect is caused by the balance between diffraction and focusing on a spherical surface, and it enables realization of high-performance ball SAW sensors.

show abstract

Direct-Sequence Systems

Principles of Spread-Spectrum Communication Systems

View full text Add to dashboard Cite

Surface wave recirculation loops for signal processing

Cited by 7 publications

References 17 publications

Direct-Sequence Communication Systems

Direct-Sequence Communication Systems

Principle and application of ball SAW devices

Direct-Sequence Systems

Contact Info

Product

Resources

About