Monthly Archives: September 2014

ADCOM911 realizes benefits of Band 14 LTE during local concert

2016-02-10T09:48:32+00:00

ADCOM911 conducted a ceremony in June to announce the launch of its LTE network, but construction of the fixed system is not complete in the area around Dick’s Sporting Goods Park, so Adams County opted to use the deployable unit from General Dynamics C4 Systems to provide Band 14 LTE coverage in the concert area, [...]

ADCOM911 realizes benefits of Band 14 LTE during local concert 2016-02-10T09:48:32+00:00

Denver area public safety realizes benefits of Adams County Band 14 LTE during local concert

2016-02-10T09:48:41+00:00

Denver-area public-safety agencies utilized Adams County’s leased Band 14 spectrum from FirstNet and deployable LTE communications to gain unprecedented access to network databases during a recent concert by the band Phish, even when commercial-carrier systems in the area were saturated by social-media traffic from attendees. Phish conducted the three-day concert on Aug. 29-31 at Dick’s [...]

Denver area public safety realizes benefits of Adams County Band 14 LTE during local concert 2016-02-10T09:48:41+00:00

FirstNet board approves spectrum-lease agreement with state of Texas

2016-02-10T09:48:50+00:00

FirstNet board members approve a three-year spectrum-management-lease agreement (SMLA) with the state of Texas, providing some spectral stability to the public-safety LTE network deployed in Harris County, Texas—the first such operational network to be established in the United States. […]

FirstNet board approves spectrum-lease agreement with state of Texas 2016-02-10T09:48:50+00:00

In-line interference mitigation techniques for spectral coexistence of GEO and NGEO satellites

2016-02-10T09:49:06+00:00

SUMMARY The interest towards the deployment of Low Earth Orbit (LEO)/Medium Earth Orbit (MEO) satellite systems in several frequency bands is increasing due to the requirement of low latency for real-time systems and high demand of broadband data. When the number of usable Non-Geostationary (NGEO) satellites, that is, LEO/MEO in space, increases, the frequency coexistence [...]

In-line interference mitigation techniques for spectral coexistence of GEO and NGEO satellites 2016-02-10T09:49:06+00:00

Analysis and performance evaluation of new coding options for space telecommand links – Part I: AWGN channels

2016-02-10T09:49:37+00:00

We investigate and compare, over the additive white Gaussian noise channel, different options for updating the error correcting code currently used in space mission telecommand links. Besides some more consolidated proposals, using low-density parity-check codes, we characterize and assess the performance of alternative schemes, based on parallel turbo codes and soft-decision decoded Bose-Chaudhuri-Hocquenghem (BCH) codes. [...]

Analysis and performance evaluation of new coding options for space telecommand links – Part I: AWGN channels 2016-02-10T09:49:37+00:00

Analysis and performance evaluation of new coding options for space telecommand links – part II: jamming channels

2016-02-10T09:49:45+00:00

SUMMARY In this paper, we study the performance of telecommand space links affected by pulsed, continuous wave and pseudo-noise jamming. Countermeasures include coding, interleaving, and direct sequence spread spectrum. Binary and non-binary low-density parity-check codes, parallel turbo codes, and soft-decision decoded BCH codes are considered. We investigate the impact of different decoding algorithms, also taking [...]

Analysis and performance evaluation of new coding options for space telecommand links – part II: jamming channels 2016-02-10T09:49:45+00:00

Efficient dynamic authentication for mobile satellite communication systems without verification table

2016-02-10T09:49:56+00:00

SUMMARY The mobile satellite system is an important wireless communication system widely used nowadays. The issue of protecting the transmission security in low-earth-orbit satellite networks thus becomes more and more critical. It is known that several authentication schemes for satellite communication systems have been proposed to deal with the issue. However, previous protocols either employ [...]

Efficient dynamic authentication for mobile satellite communication systems without verification table 2016-02-10T09:49:56+00:00

Early detection and rejection probability-based congestion control scheme for deep space networks

2016-02-10T09:50:16+00:00

SummaryDeep Space Networks (DSNs) are a class of DTNs. In such networks, owing to limited radio range and node mobility, end-to-end paths between source and destination nodes are not available. Messages are relayed by store-and-forward strategy and may be buffered for long periods before being forwarded to the next hop. Therefore, the buffer of message [...]

Early detection and rejection probability-based congestion control scheme for deep space networks 2016-02-10T09:50:16+00:00

Satellite interference evaluation: joint effect of modeling earth station locations and earth station antenna sidelobe gains as random variables

2016-02-10T09:50:49+00:00

SUMMARY When several satellite communication systems share the same frequency band, each system operates under the aggregate interference generated by the others. In this interfering environment, interference calculation procedures in which worst-case situations and simplifying assumptions are considered are commonly used. Given that the geostationary satellite orbit and the frequency spectrum are limited resources, it [...]

Satellite interference evaluation: joint effect of modeling earth station locations and earth station antenna sidelobe gains as random variables 2016-02-10T09:50:49+00:00