TITLE: High Dynamic Range
Multi-Carrier Amplifier (HDR MCA)
ACQUISITION PROGRAM: Digital
Modular Radio (DMR), Battle Force Tactical Network (BFTN), HForce
OBJECTIVE: Architect and
develop a prototype High Dynamic Range Multi-Carrier Amplifier (HDR MCA) that
can support up to 36 concurrent carriers with high individual carrier power
variations and the resulting intermodulation interference in the Very High
Frequency (VHF) and Ultra High Frequency (UHF) bands.
DESCRIPTION: The technology
to be developed should:
a. Provide a VHF (30MHz - 300MHz) coupler system that incorporates technologies
such as comb-filters and pre-distortion for up to 16 frequency channels that
include single or multiple high-power amplifier(s) for each channel with
frequency hopping, and at least 50dBW transmit power output without incurring
significant interference effects (>3 dB). The output of the amplifiers
should provide sample transmitted signals so the transmissions can be cancelled
from the separate receive antenna. Optionally, the prototype HDR MCA may
directly incorporate the interference cancellation feature; however, the
samples of the transmitted signal must be provided as discreet outputs. The
VHF coupler system supports 16 hopping transmit channels with 5 dBm input per
channel. The number of channels supported should scale to 36 channels.
b. Provide an UHF (300MHz - 3GHz) coupler system and UHF amplifier with support
for up to 24 frequency channels.
c. Provide linear amplification with Simultaneous Transmit and Receive (STaR)
interference mitigation for Multi-Frequency Time Division Multiple Access
(MFTDMA) carriers over the full High Frequency (HF) band (3MHz - 30MHz) with at
least 50dBW total transmit power output and support MFTDMA channels with 5dBm
PHASE I: Design an
architecture for a HDR MCA that directly interfaces or integrates into the
Digital Modular Radio (DMR) to yield high dynamic range amplification in VHF
and UHF bands. Additionally, the HDR MCA shall facilitate hosting of emerging
advanced waveforms such as HF Over-the-horizon Communication (HFORCE) in the HF
band on DMRs and emerging HF radio systems (e.g., PRC-117G). Establish whether
the amplifier can be produced as a single entity or a combination of multiple
discreet amplifiers. If multiple discreet amplifiers are to be utilized,
provide a management and control architecture concept required to easily
integrate the HDR MCA into the target system. Develop the supporting amplifier
architecture concept that will address high individual carrier power variations
and mitigate the resulting intermodulation interference.
Identify the near term HDR MCA Pre-Planned Product Improvement (P3I) required
for HFORCE's HF MFTDMA implementation in the 2025 timeframe.
Develop prototype plans for Phase II.
PHASE II: If multiple
discreet amplifiers are to be utilized, then provide a management and control
architecture required to easily integrate the HDR MCA in to the target system
(initially DMR). Develop the supporting amplifier architecture that will
address high individual carrier power variations and mitigate the resulting
intermodulation interference. Develop a set of performance specifications for
HDR MCA for interfaces and/or direct integration into DMR. Develop the
prototype HDR MCA based on Phase I work for demonstration and validation in
DMR. Identify the preliminary lifecycle support strategies and concepts for
HDR MCA to include Lowest Replaceable Unit (LRU), depot/contractor facility
repair and/or maintenance, and sparing.
Establish a working relationship with a candidate HFORCE waveform contractor
(Program Office will assist in the identification and introduction) to perform
initial development of any necessary Pre-Planned Product Improvement (P3I)
requirements to integrate HFORCE into DMR.
PHASE III DUAL USE
APPLICATIONS: Refine, fully develop, and integrate the Phase II prototype HDR
MCA into DMR. Integrate HDR MCA into a prototype HFORCE system for initial
Perform Formal Qualification Tests (FQT) of HDR MCA Production Representative
Article (PRA) in the DMR against the performance specification for HDR MCA.
Support the fielding and maintenance of HDR MCA by implementing the lifecycle
support strategies and concepts with the DMR and HFORCE waveform contractors.
The current trends in commercial 5G communications technology selection
indicates the potential application of multi-carrier waveforms with highly
varying peak to average power. HDR MCA technologies may provide a solution for
future 5G baseband towers with limited application on user terminals.
1. General Dynamics Mission
Systems. Digital Modular Radio (DMR): Software-Defined Communications for the
U.S. Navy, 2017, https://gdmissionsystems.com/radios/digital-modular-radio/
2. RF Power Amplifier. https://en.wikipedia.org/wiki/RF_power_amplifier
3. Bawa, Sangeeta. Pal,
Maninder, and Gupta, Jyoti. “Pre-distortion Based Linearisation Technique for
power Amplifiers of Wideband Communications Systems.” International journal of
Scientific & Engineering Research, Volume 4, issue 5, May 2013, ISSN:
2229-5518. pp 726-733. https://www.ijser.org/researchpaper/Pre-distortion-Based-Linearisation-Technique-for-Power-Amplifiers-of-Wideband-Communication-Systems.pdf
4. Comb Filter. https://en.wikipedia.org/wiki/Comb_filter
KEYWORDS: HF; VHF; UHF;
Multi-Carrier Amplifier; High Dynamic Range; Wideband; DMR; BFTN; HFORCE
** TOPIC NOTICE **
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