TrellisWare Technologies, Inc. | Date: 2015-10-28
Throughput for rate-adaptive wireless communication is maximized by accounting for the rate loss associated with selecting a transmission rate as a function of the actual rate supported by the channel. An optimal rate is selected by minimizing a set of average cost functions; each of the average cost functions is based on the delayed LQMs and rate-loss cost functions associated with selecting a candidate transmission rate as a function of a maximum rate supported by the channel.
Agency: Department of Defense | Branch: Air Force | Program: SBIR | Phase: Phase I | Award Amount: 149.86K | Year: 2014
ABSTRACT: The Air Force has a goal of supporting very high bandwidth communication systems for airborne and ground terminals. This communication system should support a wide range of data rates that will be imposed by the terminal sizes, link distances , and weather conditions. It is envisioned that this system should primarily achieve the communication through free space optical (FSO) transmission but have the capability to provide backup communication through standard radio transmission. There are two fundamental problems in achieving this objective: 1) getting transmitted power on the target receiver and 2) efficiently using the power to maximize the rate and reliability of data communications. The first problem involves pointing and tracking of the communication resources (laser beam or radio beam) and the second involves modems that optimize the throughput and error rate performance for the link. It is typical in modern FSO development programs that these two problems are solved quasi-independently because there is little dependence between the technologies of pointing and tracking and modern high performance modem design (recent examples include the DARPA FOENEX and ONR TALON programs). Consequently, TrellisWare is proposing a solution to the second problem based on a decade of cutting-edge modem research and development. BENEFIT: A universal modem using reliable adaptive coded modulation (RACM) developed in this program could, in principle, be directly applied to commercial backhaul or specialty networks (intra-campus). The development of a jointly optimized scheme for both radio FSO links can be the first step for TrellisWare"s entry into the commercial communications market. We anticipate partnerships with companies that are targeting the commercial backhaul or specialty networks market. These companies will see TrellisWare providing a complete baseband electronics board for such systems. A Phase II demonstration will prove the commercial viability of the RACM approach.
Agency: Department of Defense | Branch: Air Force | Program: SBIR | Phase: Phase I | Award Amount: 149.12K | Year: 2014
ABSTRACT: There are many situations where military receivers require coordinated universal time (UTC) in GPS-denied environments. TrellisWare has already developed and fielded a TRL 9 military waveform that synchronizes to microsecond-to-millisecond accuracy without GPS. This waveform provides a feasibility proof for the capability sought by the Air Force. In this program, TrellisWare will identify and develop the lowest-complexity and most cost-effective solution for realizing our proven techniques for secure time delivery via the existing commercial and tactical wireless infrastructure. BENEFIT: The techniques developed in this program could be applied to provide time sync and wireless localization capabilities to commercial and first responder radios that are used in GPS-denied environments. Examples include mining, tunnels, and post-disaster recovery efforts.
Agency: Department of Defense | Branch: Navy | Program: SBIR | Phase: Phase II | Award Amount: 1.35M | Year: 2013
Phase II.5 proposal, extension of Phase II contract N00014-09-C-0510. Free-space Laser communications (Lasercomm) or free-space optical (FSO) communications is rapidly gaining traction as a next-generation line-of-sight (LOS) wireless technology for both commercial and military applications. Over short time scales (e.g., milliseconds), these high-bandwidth links are plagued by scintillation fading due to atmospheric turbulence and (possibly) boundary layer effects (e.g., at the surface of fast moving aircraft in ship-air links). Although somewhat analogous to the mutlipath-induced fading that is familiar in mobile RF communications, optical scintillation-induced fades typically span thousands to millions of symbols rather than tens to hundreds due to the higher symbol rates and longer fade durations. Consequently, solutions for combating fading in RF links do not readily extend to Lasercomm. During Phase I, TrellisWare showed that a modern coded-protocol can offer dramatic throughput improvements over existing state-of-the-art baseband approaches in scintillation-induced fading FSO links. In Phase II.5, TrellisWare proposes to design and implement a hardware prototype FSO modem, to include optics, to demonstrate that our approach can be effectively and efficiently implemented for use on real maritime and expeditionary links. TrellisWare has already received interest from its FSO industry partners in the proposed hardware thus demonstrating a clear path to commercialization during Phase III and beyond.
Agency: Department of Defense | Branch: Army | Program: SBIR | Phase: Phase I | Award Amount: 99.97K | Year: 2014
TrellisWare Technologies, Inc. (TrellisWare) understands the importance of the ?Golden Hour?; that precious time between when traumatic injuries occur and when Level I medical care can be administered. A system that can virtually bring the physician?s eyes, ears and diagnostic equipment onto the battlefield at the point of injury (POI) can effectively extend that ?Golden Hour? and save lives. Key components of that system include a set of diagnostic sensors to monitor soldier biometrics, a secure means to access and view that sensor data, and a tactical network to transmit that data to remote doctors or commanders. With such a system is in place, the next logical step would be to move from diagnosing soldiers once a casualty has occurred to constantly tracking soldier?s biometrics in order to provide real-time health monitoring and casualty detection. In order to provide value on the battlefield, this advanced solution would need to simultaneously track and monitor squads or platoons of soldiers, and do so in harsh environments where typical radio communications typically fail. TrellisWare presently proposes to provide a technical solution that will meet the objectives of the advanced soldier biometric monitoring and tracking system described above.
Agency: Department of Defense | Branch: Army | Program: SBIR | Phase: Phase I | Award Amount: 99.90K | Year: 2014
The performance of the Soldier Radio Waveform (SRW) can be greatly degraded in the presence of electronic interference. In particular, all dismounted communications from an SRW-enabled blue force radio (BFR) can be stymied when a red force radio jammer (RFRJ) is operating on a nearby vehicle. Such electronic fratricide greatly reduces the safety and effectiveness of the dismounted soldier. In this multi-phase SBIR program, TrellisWare will provide an interference mitigation capability for an SRW-enabled BFR in the presence of an untethered RFRJ.
TrellisWare Technologies, Inc. | Date: 2014-03-19
An apparatus for joint analog and digital interference cancellation includes a receiver configured to receive an analog reference interfering signal on a reference path, and a sum of an analog interference signal and an analog signal of interest on an antenna path. An analog interference canceller may be configured to produce an analog partially interference-cancelled signal using the analog reference interfering signal and the sum of the analog interference signal and the analog signal of interest. A first analog-to-digital converter may be configured to digitize the analog reference interfering signal to produce a digital reference interfering signal. A second analog-to-digital converter may be configured to digitize the analog partially interference-cancelled signal to produce a digital partially interference-cancelled signal. A digital interference canceller may be configured to produce an interference-cancelled signal using the digital reference interfering signal and the digital partially interference-cancelled signal.
TrellisWare Technologies, Inc. | Date: 2014-09-24
Systems and methods are presented for controlling the peak-to-average-power of a baseband orthogonal-frequency-domain multiplexing (OFDM) signal by designating a subset of the available subcarriers as information-bearing data-subcarriers, and loading remaining subcarriers by symbols that are a function of the symbols loading the data-subcarriers. At the receiver, the data-dependent subcarriers are optionally combined with data-subcarriers to increase error protection.
TrellisWare Technologies, Inc. | Date: 2014-11-04
A method and system for flexible radio communications using a wideband radio includes a wideband radio and multiple separable radio definition modules, wherein the wideband radio is configured to operate over a large portion of the radio-frequency (RF) spectrum and each of the radio definition modules are configured to operate in a specific frequency band. The separability of the radio definition modules maintains the capability of the wideband radio to operate over the large portion of the RF spectrum, as well as enabling its robust and reliable operation in a specific frequency band associated with the attached radio definition module.
TrellisWare Technologies, Inc. | Date: 2015-01-30
A method for interference estimation and mitigation includes receiving a high-resolution digital signal. The high-resolution digital signal comprises a signal of interest and an interfering signal. An estimate of the interfering signal is generated using a quantizer. The signal of interest is in a quantization noise of the quantizer. An interference-mitigated signal of interest is generated based on a difference of the estimate of the interfering signal and the high-resolution digital signal.