Motorola Solutions, Inc.

Motorola Corporation

Freescale Semiconductor,inc.

Gregory J Buchwald

Lawrence Marvin Ecklund

Arthur Christopher Leyh

Stephen Leigh Kuffner

David P Gurney

Thomas B Bohn

Rodney Wayne Hagen

S David Silk

Randy L Ekl

Steven F Gillig

Mario Frank DeRango

Bruce D Mueller

Ramy S Ayoub

Bradley Michael Hiben

Jeffrey D Bonta

Pallab Midya

John M Belcea

Patrick Douglas Koskan

William J Roeckner

Thomas S Messerges

Melanie King

Charles Eric Seaberg

Richard Stanley Rachwalski

Sanjaykumar S Karpoor

Terry K Mansfield

Michael L Johnson

Roy H Espe

Dennis M Drees

Mario F Derango

Steven G Parmelee

Azfar Inayatullah

Kenneth S Hutchinson

Frank D Panzica

Apolinar Chaidez

Lynn D Dann

In S Kim

Stephen C Tremmell

Michael B Tiedt

Lawrence M Ecklund

Rodney W Hagen

Stephen L Kuffner

Michael S Johnson

A system for low earth orbit (LEO) satellite communication. In one example, the system includes a control computer and a workgroup including a plurality of communication devices. Each communication device includes an electronic processor configured to establish a wireless network connection with the control computer, determine connectivity data associated with a signal between the communication device and a first LEO satellite, and transmit the connectivity data to the control computer via the wireless network connection. The control computer is configured to receive the connectivity data from each communication device, and select a first one of the plurality of communication devices as a primary communication device based on each of the connectivity data. The primary communication device is configured to receive media from a different one of the plurality of communication devices via the wireless network connection and transmit the media to the first LEO satellite.

Low earth orbit satellite communication using device diversity reception and transmission

Apparatus and method for linearizing narrowband carriers with low resolution predistorters are provided. The method includes amplifying, using a power amplifier, one or more broadcast carriers and linearizing, using a predistorter coupled to the power amplifier, the one or more broadcast carriers. The method also includes determining, using an electronic processor, a composite bandwidth of the one or more broadcast carriers and determining, using the electronic processor, whether the composite bandwidth is below a modulation bandwidth of the predistorter. The method further includes controlling, using the electronic processor, a pacification carrier generator coupled to the electronic processor to combine a pacification carrier with the one or more broadcast carriers when the composite bandwidth is below the minimum modulation bandwidth of the predistorter.

Linearizing narrowband carriers with low resolution predistorters

Apparatus and method for reallocation of spectral resources in multiwaveform systems. One embodiment provides a base station operating in a narrowband spectrum and broadband spectrum that share a band allocation of RF spectrum. The base station includes a narrowband transceiver, a broadband transceiver, and an electronic processor coupled to the narrowband transceiver and the broadband transceiver. The electronic processor is configured to determine that a traffic load on the narrowband transceiver is increasing and determine a number of additional carrier channels based on the traffic load to operate the narrowband transceiver within a predefined blocking rate. The electronic processor is also configured to reduce a bandwidth of the broadband transceiver based on the number of additional carrier channels and assign additional carrier channels to the narrowband transceiver to operate the narrowband transceiver with the number of additional carrier channels.

Reallocation of spectral resources in multiwaveform systems

A base station device and a method for multi-carrier crest factor reduction are provided. The method includes generating, using a plurality of radio frequency sources, a plurality of radio frequency carrier signals. The method also includes initiating modulation, using a plurality of carrier modulators, of a first subset of the plurality of radio frequency carrier signals with information signals at a first time to generate a plurality of modulated signals and initiating modulation, using the plurality of carrier modulators, of a second subset of the plurality of radio frequency carrier signals with the information signals at a second time to generate the plurality of modulated signals. The second time is a predetermined time offset after the first time. The method also includes transmitting, using one or more antennae, a multi-carrier signal including the plurality of modulated signals.

Multi-carrier crest factor reduction

Systems and methods for combined parallel processing of spectral information in a radio frequency environment. One example method includes controlling, with an electronic processor, a wideband receiver coupled to a receive path to scan a band of interest. The method includes receiving, from the wideband receiver, wideband scan data for the band of interest. The method includes identifying, based on the wideband scan data, a spectral region including a signal of interest. The method includes controlling, with the electronic processor, a narrowband receiver coupled to the receive path in parallel with the wideband receiver to collect a sample of the signal of interest.

Combined parallel processing of spectral information for a radio frequency environment

Base station device with reduced power consumption and method thereof. The base station device includes a transmitter configured to implement time-division multiple access (TDMA). The transmitter transmits payload signals in a TDMA frame including a first timeslot and a second timeslot, with one of the first timeslot and the second timeslot designated as an active timeslot and the other of the first timeslot and the second timeslot designated as an idle timeslot. The base station device includes an electronic processor coupled to the transmitter and configured to control transmission of calls through the transmitter. The electronic processor is configured to transmit payload signals during the active timeslot and de-key the transmitter during the idle timeslot. During a voice call, the electronic processor is configured to re-kay the transmitter during a portion of the idle timeslot to transmit synchronization information.

Base station device with reduced power consumption and method thereof

A method and server provide for routing traffic to user equipment in a talkgroup. The server receives a request for a new talkgroup call for a talkgroup. The server determines a total number of device targets for the talkgroup call. When the total number of device targets for the new talkgroup call is greater than a predetermined total target threshold number, a call grant for the new talkgroup call is routed to each device target for the talkgroup via a Land Mobile Radio (LMR) network. When the total number of device targets for the new talkgroup call is less than the predetermined total target threshold number, the call grant for the new talkgroup call is routed to each device target for the talkgroup via a preferred network for each device target.

Method and controller to provide large group data calls while reducing group echo

A device and method for radio-frequency site evaluation is provided. The radio-frequency site comprises one or more radio transmitters in communication with one or more transmit antennas, a monitoring radio receiver in communication with a receive antenna through a variable attenuator, and a controller in communication with the one or more radio transmitters, the monitoring radio receiver and the variable attenuator. The controller identifies the one or more radio transmitters which are currently transmitting, and responsively controls the variable attenuator to an attenuation value where a dynamic range of the monitoring radio receiver has a linear response for total power received at the receive antenna, the attenuation value associated with the one or more radio transmitters that are currently transmitting. Thereafter, the controller controls the monitoring radio receiver to scan at least currently active frequencies of the one or more radio transmitters, for example to detect problems at the site.

Device and method for radio-frequency site evaluation

A communication system () is formed of a base station comprising a main base station receiver with a main base station antenna () and a secondary receiver with a secondary antenna (). The secondary receiver detects interference to the main base station antenna () causing reduced communications range for communicating with subscriber units (). The secondary receiver rotates a receiver null () of the secondary antenna () to reduce the interference in response thereto. The communication system () performs a voting decision that selects between the secondary receiver with rotated receiver null and the main base station receiver () with reduced communications range, to mitigate the interference to main base station antenna ().

System and method for mitigating electronic interference

Methods and systems for improving adjacent channel rejection performance in a wireless signal by a radio device in a mobile network. In one embodiment, a mobile radio network includes a first radio device (e.g., a subscriber), a second radio device, and a fixed radio apparatus (e.g., a base station or repeater). The first radio device receives a first channel signal having a first frequency offset with respect to a reference frequency. The first channel signal is associated with the second radio device. The first radio device measures the first frequency offset, determines a second frequency offset for a second channel signal, and transmits the second channel signal with the second frequency offset.

Method and system for improving adjacent channel rejection performance in a wireless network

Disclosed herein are methods and systems for dynamically adjusting frequency offsets for mitigating interference. One embodiment takes the form of a process carried out by a mobile radio configured to use an adjustable transmit frequency. The mobile radio estimates an expected base-station-receive power level with respect to transmissions from to a base station. The mobile radio adjusts the transmit frequency to be a center frequency of a radio channel plus a default frequency offset responsive to the estimated expected base-station-receive power level being less than a first threshold. The mobile radio adjusts the transmit frequency to be the center frequency plus a modified frequency offset responsive to the estimated expected base-station-receive power level being greater than a second threshold. The modified frequency offset is greater in magnitude than the default frequency offset. The mobile radio transmits an uplink signal to the base station over the adjusted transmit frequency.

Methods and systems for dynamically adjusting frequency offsets for mitigating interference

Spectral efficiency is improved by assigning uplink channels according to expected receive signal levels at a serving base station. A first subscriber device detects a new call request indication, and then determines, as a function of its transmit power level and current location relative to the serving base station, an expected receive signal strength indication (RSSI) at its serving base station. Depending on whether it is determined that the expected RSSI is greater than or less than a RSSI threshold: one of (i) transmitting a call request to the serving base station requesting an assignment to a respective designated high-power or low-power channel for the new call and (ii) transmitting the new call on a respective pre-allocated high-power or low-power channel.

Geo-location based dynamic uplink traffic channel allocation

A mixer, a receiver, and a method provide dynamic sub-sampling mixer which adjust a sub-sampling rate based on power drain and performance. A mixer includes mixer circuitry receiving an input of a Radio Frequency (RF) input signal and providing an output of a baseband signal of the RF input sampled at a sub-sampling rate, baseband parametric control circuitry receiving the baseband signal and measuring at least one parametric value of the baseband signal, and sampling period control circuitry receiving the at least one parametric value and adjusting the sub-sampling rate based thereon, the sub-sampling rate or ratio is adjusted minimize power drain while ensuring performance of the at least one parametric value is satisfying a predetermined level.

Dynamic sub-sampling radio frequency mixer systems and methods

A communications system and method for exchanging spectrum usage information through a drop box () includes one or more central stations () that defines a region of operation. A central drop box () is associated with the central station () for providing a database of spectrum usage information. Stations () using the communications system may submit information regarding spectrum usage to the central drop box () that affects the region of operation () for providing the most efficient and non-interfering uses of the frequency spectrum.

Communications system for exchanging spectrum sensing measurements through a drop box and method of using same

A means for determining a channel for communication in a wireless communication system is provided. A method includes receiving one or more sub-frames of a beacon signal on a beaconing channel until a legitimacy condition of the beacon signal is met. The beacon signal is transmitted by a beaconing device. The method further includes determining a suitability of the channel for communication in the wireless communication system based on the legitimacy condition.

Method, system and a data frame for communication in a wireless communication system

Growing community of inventors

Crystal Lake, IL, United States of America

Gregory J Buchwald