Motorola Corporation

Motorola Solutions, Inc.

Robert J Corke

Ron Rotstein

Gregory M Agami

Daniel G Prysby

Christopher G Ware

Michael F Zeleznik

Colin D Frank

Apoorv Chaudhri

Yadunandana N Rao

Trefor J Delve

Robert T Love

Steven C Jasper

Yuda Yehuda Luz

Isam Robert Makhlouf

Ralf Hekmann

Jeffrey D Bonta

Charles R Ruelke

David P Gurney

John M Belcea

Jorge Seoane

Mark R Braun

Ramy S Ayoub

S David Silk

Shmuel Silverman

Mark S Hansen

George Powley

Stefan Paun

Bob D Logalbo

Yehuda Luz

Arie Z Schwartzman

David G Prysby

Dean H Skuldt

Yuri Fridman

A device and method to determine incoming communications is provided. A device in communication an array of antenna devices determines respective quality metric weights for respective signal data representing respective signals received by the antenna devices. The device applies the respective quality metric weights to the respective signal data to determine total received signal data. The device determines, based on the total received signal data, that the array of the antenna devices has received an incoming communication.

Device and method to determine incoming communications

A method and system for direct mode operation (DMO) of a talkgroup enables device to device (D2D) DMO operation leveraged from a Land Mobile Radio (LMR) system. The method includes scanning at a radio receiver a defined radio frequency spectrum; receiving at the radio receiver in the defined radio frequency spectrum a wake-up signal; identifying a talkgroup identifier in the wake-up signal, wherein the talkgroup identifier corresponds to a talkgroup being monitored by the radio receiver; in response to identifying the talkgroup identifier, decoding code sequences included in the wake-up signal; identifying in at least one of the code sequences both a center frequency and a transmission bandwidth of the DMO transmission; and tuning the radio receiver to receive the DMO transmission at the center frequency and transmission bandwidth.

Method and system for direct mode communication within a talkgroup

A method () and a non-incumbent system () that selects a pilot signal candidate within the RF spectrum, determines a first ratio between a measured total power within the RF spectrum and a measured power level of the pilot signal candidate, measures a first difference between the first ratio and an expected ratio, processes the first difference to select a threshold difference value, and outputs the threshold difference value.

Threshold selection for broadcast signal detection

Efficient frequency spectrum sharing between at least one incumbent communication system(s) () and at least one cognitive radio (CR) system () is provided. The CR unit includes OFDM detection () for detecting the presence of OFDM signals which indicate the presence of an incumbent communication system within the shared spectrum. The CR system () updates channel occupancy information in response to the detected OFDM signals so as not to interfere with the incumbent communication systems ().

Method and apparatus for detection of orthogonal frequency division multiplexing (OFDM) signals by cognitive radios

A method for use in a digital communications receiver for controlling an input signal level () into an analog-to-digital converter (ADC) initially receives a sample sequence () where a threshold crossing rate is measured as a percentage samples of an input signal that exceed the threshold (). The error between the measured threshold crossing rate and a desired reference threshold crossing rate is calculated () and an error signal is then utilized in a feedback loop to control the receiver gain such that the error is reduced ().

Method and apparatus for complementary cumulative distribution driven level convergence for spectrum sensing

A method, system and apparatus for managing communication in a Public Safety Communication Network (PSCN). The PSCN includes a plurality of Mobile Stations (MSs) () and a master controller (). The method includes initiating a communication between one or more MSs and the master controller using a primary channel (). The primary channel corresponds to a primary frequency spectrum in the PSCN. The method further includes identifying one or more available channels in one or more of the primary frequency spectrum and a secondary frequency spectrum (). Each of the primary frequency spectrum and the secondary frequency spectrum include one or more channels. Thereafter, a channel hopping pattern is generated for one or more MSs based on one or more available channels (). The channel hopping pattern corresponds to a sequence of frequency hops for a MS.

System, method and apparatus for managing communication in a public safety communication network

A method () and apparatus () for detecting and identifying spectrum opportunities, including the steps of communicating a location of at least one node () to at least one base station () (), transmitting a list of at least one channel from the at least one base station () to the at least one node () (), and sensing the at least one channel from the list by the at least one node () (). The method () also includes the steps of determining if the at least one channel is in use, and if the at least one channel is in use, determining the user of the at least one channel that is in use ().

Method and apparatus for detecting and identifying spectrum opportunities

A method and apparatus for operation of a node within a mobile ad hoc cognitive radio network is provided. The method includes sensing at least one assigned communications channel. Sensing at least one assigned communications channel includes measuring a value of at least one parameter corresponding to the communications channel. The method further includes comparing the measured value of the at least one parameter with a set of stored values of the at least one parameter to determine a change in the measured values. Finally a sleep mode of the node is activated for a time period, wherein the time period is determined using the change in the measured values.

Method and apparatus for operating a node within a mobile ad hoc cognitive radio network

A wireless communication network is provided in which a plurality of radio devices achieve frequency diversity. By utilizing cognitive capability within the radio devices to iteratively select frequency sets, a lowest cardinality frequency set is generated and used to communicate amongst the plurality of radio devices. Each radio device can have different hardware, as the iterative selection of frequency set can take into account the different hardware capabilities of the radio devices.

System and method for performing communication in a wireless communication network

An interference contribution associated with a selected subcarrier of a plurality of subcarriers associated with a previously transmitted OFDM symbol or a current OFDM symbol is determined. A fast Fourier transform (FFT) output for the current OFDM symbol is also determined. The interference contribution is subtracted from the FFT output of the current OFDM symbol to form a modified FFT output.

System and method for reducing interference in an orthogonal frequency division modulation system

A receiver configured for: a) receiving () a first OFDM symbol and generating a plurality of demodulated symbols for the first OFDM symbol; b) generating () decoder output code symbols corresponding to a subset of the plurality of demodulated symbols; c) determining () that a set of the decoder output code symbols make up a set of reference symbols corresponding to at least a portion of the subset of the plurality of demodulated symbols; d) generating () the set of reference symbols; e) generating () a set of channel estimates based on the set of reference symbols and the at least a portion of the subset of the plurality of demodulated symbols, for use in decoding a current OFDM symbol; and f) repeating steps b-e until a channel estimate for each demodulated symbol corresponding to the first OFDM symbol has been generated.

Channel estimation using a minimized channel prediction interval

A system that includes a receiver () that is configured for: selecting () a set of demodulator output samples and a corresponding set of reference symbols; generating () a set of raw channel estimates based on the set of demodulator output samples and the corresponding set of reference symbols; subdividing () the set of raw channel estimates into a plurality of subsets; assigning and applying () a corresponding reference symbol magnitude quantization scheme to each subset; determining () a set of filter coefficients that is based on the quantization schemes applied to the subsets of raw channel estimates; and combining () the set of raw channel estimates with the set of filter coefficients to generate a channel estimate.

Method and apparatus for reference symbol aided channel estimation

A transmitting device () transmits a first packet, comprising a second encryption vector, that is encrypted using a first encryption vector. The transmitting device transmits a second packet that is encrypted using the second encryption vector if an acknowledgement message is received within a predetermined time after transmitting the first packet; otherwise, the first packet is re-transmitted. Upon receipt of the first packet, a receiving device () decrypts the first packet using the first encryption vector and transmits the acknowledgement message. Upon receipt of the second packet; the receiving device attempts to decrypt a portion of the second packet using the first and second encryption vectors. If the portion of the second packet was successfully decrypted using the first encryption vector, the receiving device re-transmits the acknowledgement message for the first packet; otherwise, it transmits an acknowledgement message for the second packet.

Method for providing point-to-point encryption in a communication system

A long code scrambler has been provided to scramble the data bits prior to QAM mapping. Different data rates are accommodated by using different long code m-tuples sampled at the modulation symbol rate, where m equals 2, 4 or 6 for 4, 16 or 64 QAM, respectively. In order to support 1XEV-DV users employing multiple Walsh code channels, a long code 6-tuple sample is permutated, to further randomize the QAM symbols. As appropriate for the modulation order, 2, 4 or 6 bits of the permutated 6-tuple are applied to the data sequence. That is, in addition to randomizing the modulation symbols for a given code channel, each code channel will likely have unique QAM symbols at any given symbol time.

Data transmission and reception within a spread-spectrum communication system

A method and apparatus for communicating in an OFDM system whereby data subcarriers associated with a first antenna of at least two transmit antennas are multiplexed with data symbols while modulating other subcarriers associated with other antennas with zero. The data subcarriers are separated between the at least two transmit antennas so that a data subcarrier and a mirror data subcarrier are not transmitted from a same transmit antenna and that adjacent data subcarriers are at least two subcarrier frequency bandwidths apart. In an embodiment, the method and apparatus further comprise receiving the transmitted subcarriers from at least two receive antennas where the transmitted data subcarriers are also separated so that the data subcarrier and the mirror data subcarrier are not received from a same receive antenna of the at least two receive antennas. The method and apparatus further comprises combining the received transmitted subcarriers from the at least two receive antennas into a single data stream.

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Glen Ellyn, IL, United States of America

Robert J Corke