High data rate UHF satcom

Stephens, D.R.; Kreitzer, K.C.

doi:10.1109/milcom.1997.645006

Cited by 7 publications

(5 citation statements)

References 6 publications

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“…Continuous Phase Modulation (CPM) [ 1,4] has recently emerged as an enabling technology for increasing the allowable data rates in a limited bandwidth system for a given SATCOM link margin. Data rates of 56 kbps for 25 lcHz (wideband) channels and 9.6 kbps for 5 kHz (narrowband) channels have been realized.…”

Section: Uhf Spectrum Dama Cpm and Muosmentioning

confidence: 99%

Evolutionary path of UHF secondary imagery dissemination systems (SIDS)

Franke

MILCOM 2000 Proceedings. 21st Century Military Communications. Architectures and Technologies for Information Superiority (Cat.

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Secondary Imagery Dissemination is the process of postcollection and electronic dissemination of digital imagery and associated data. SID Systems (SIDS) provide exploited, non-original, annotated, anonymoussource imagery from intelligence, fusion, and dissemination centers. Ultra-High Frequency (UHF) operation penetrates double-canopy jungle or heavy rain to provide imagery from an INTEL center to highlymobile tactical users. The evolutionaly path of UHF SIDS commenced with a system based on previouslyfielded equipment for tactical battlefield commanders receiving intelligence information over Tactical Related Applications (TRAP) Data Dissemination System (TDDS) receivers. As tactical transceivers appeared in the inventory, SIDS networks migrated to dedicated Satellite Communications (SATCOM) receivers with embedded cryptography giving users talk-back capability for query or tasking the imagely sensor or data fusion center. In concert with the desire for users to share the scarce resource of available SATCOM channels, the SIDS roadmap is turning to DAMA networks for assignment to a wideband (25 kHz) Demand-Assigned Single-Access (DASA) channel for transfer of large, compressed imagery Jiles. The nearterm hope of re-mining available UHF SATCOM assets for greater bandwidth appears to be feasible with the advent of Continuous Phase Modulation (CPM). Longterm solutions lie in the plans for the Mobile User Objective System (MUOS). The key to SIDS interoperability is the ability of mandated image formatting and communication protocols to embrace COTS initiatives.Examination of the present state, interim transition and fbture migration of SIDS yields an architectural roadmap to ensure radio compatibility by focusing on image format, communications protocol, UHF SATCOM interoperability standards and Commercial Off-the-shelf (COTS) initiatives. Initially SIDS was disseminated over a "TDDS-like" channel, based on the Army Space Program (ASPO) Tactical Exploitation of National Capabilities (TENCAP) system of data providers and user receivers. Presently imagery dissemination is handled over dedicated (non-DAMA) tactical transceivers, due to the large size of compressed files and the lack of fielded DAMA-compatible radios. FLTSATIUFO -FIA-18D

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Section: Uhf Spectrum Dama Cpm and Muosmentioning

confidence: 99%

Evolutionary path of UHF secondary imagery dissemination systems (SIDS)

Franke

MILCOM 2000 Proceedings. 21st Century Military Communications. Architectures and Technologies for Information Superiority (Cat.

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“…However, in a non-linear, bandlimited channel, their envelope does exhibit time dependence. The approximation of Equation 11-36 may be invalid in such a communications channel [35]. Many of the spectrally efficient waveforms such as Quadrature Amplitude Modulation (QAM) do not meet this criteria of a constant envelope.…”

Section: Becausementioning

confidence: 99%

“…Many of the spectrally efficient waveforms such as Quadrature Amplitude Modulation (QAM) do not meet this criteria of a constant envelope. (The constant envelope waveforms are highly desirable in nonlinear channels to avoid spectral regrowth [35][36][37].) Equation 11-36 represents a correlation receiver [10,31,35].…”

Section: Becausementioning

confidence: 99%

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Synchronizers for Digital Communications

Phase-Locked Loops for Wireless Communications

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Synchronization of digital waveforms is an area of active research. For the latest information, the reader is encouraged to review the latest issues of IEEE Transactions on Communications. Several references exist that can provide a larger theoretical foundation than provided in this chapter [1-5]. Today's demand for wireless services promises to exceed the available frequency spectrum, necessitating more efficient modulation techniques. Waveforms such as Continuous Phase Modulation (CPM) or Trellis Coded Modulation (TCM) provide more efficient spectral usage, but synchronization is significantly more difficult than traditional Phase Shift Keying (PSK) or Frequency Shift Keying (FSK).

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“…Previously, parallel frequencyoffset phase-locked loops have provided narrow loop bandwidths to obtain the high loop SNR necessary to acquire the CPM waveform [5]. Unfortunately, parallel loops increase the probability of false acquisition.…”

Section: Introductionmentioning

confidence: 99%

An innovative synchronization preamble for UHF MILSATCOM

Miller

Harris²,

Stephens³

MILCOM 1999. IEEE Military Communications. Conference Proceedings (Cat. No.99CH36341)

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4-ary, multi-h Continuous Phase Modulation (CPM) has been added to MIL-STD-188-181B for dedicated mode UHF SATCOM operation to provide greater throughput capacity for this power-and bandwidth-restricted communications network. The physical layer of the waveform is designed to occupy the entire channel bandwidth at all data rates, optimizing power and spectral efficiency, but presenting challenges for acquisition. As an example, at low data rates the waveform has a 4 dB processing gain relative to binary phase shift keying (BPSK). Hence this waveform is expected to be acquired successfully at an EdN, 4dB lower than that of BPSK. To acquire the CPM waveform, the modem must be capable of acquiring at low signal-to-noise, in the presence of large unknown frequency and timing offsets, and with the bandlimiting and hard-limiting channel impairments introduced by the satellite. To promote interoperability and reliability, the Joint Interoperability and Engineering Organization (JIEO) requested a synchronization method that would provide reliable acquisition at an E D , corresponding to a 1 x lo" bit-error-rate and also provide automatic data rate and waveform parameter detection. The resulting preamble achieves the aforementioned objectives and, in addition, is short enough in length to allow it be implemented as the burst preamble for future incorporation of the CPM waveform into the MIL-STD-188-182 and -183 demand assigned multiple access modes of operation. In this paper the design philosophy and implementation of the preamble are presented.

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High data rate UHF satcom

Abstract: C2 3 19 0 R. A. Axford B S2Wý 94-26790 lIIIEIiii 94 8 22 179 A MAppoe for publi role.. ditrbulio Is unlWmhs.

Cited by 7 publications

References 6 publications

Evolutionary path of UHF secondary imagery dissemination systems (SIDS)

Evolutionary path of UHF secondary imagery dissemination systems (SIDS)

Synchronizers for Digital Communications

An innovative synchronization preamble for UHF MILSATCOM

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