Abstract:
A method and system for operational improvements in a dispatch console in a multi-source environment includes receiving (310) a plurality of audio streams simultaneously from a plurality of mobile devices, transcribing received audio streams by the means of speech-to-text conversion, presenting real-time transcriptions to the user and determining (320) if a first keyword is present in at least one of the plurality of audio and/or text streams. Upon determining the presence of the first keyword, the dispatch console automatically performs (330) at least one predefined dispatch console operation from a list of predefined dispatch console operations. The dispatch console further receives (340) a second keyword based on determining the presence of the first keyword and checks (350) for the presence of the second keyword within the audio and/or text streams thereby enabling additional automated dispatch console operations.
Abstract:
A method for managing a packet in a communication system between two or more endpoints, a sender and one or more recipients, comprises receiving a first packet comprising a source identifier that uniquely identifies a sender of the first packet and a current source time assigned to the first packet by the sender, determining a received time for the first packet, retrieving a cached source time assigned by the sender to a second packet that was received prior to receiving the first packet, and determining whether to discard or process the first packet based on the current source time, the received time, and the cached source time. The current source time, the received time, and the cached time, in addition to predetermined parameters such as a maximum age and an anti-replay window allows a recipient to determine whether to process or discard a packet.
Abstract:
A communication device uses its FGU to generate a location signal that can be used by a reference device to calibrate the communication device and to determine the distance of the communication device from the reference device. The communication device: receives, from a reference device, at least one location signal control parameter that defines pulse shape characteristics for a location signal; configures its FGU based on the at least one location signal control parameter; generates a linear first part of a phase-incoherent location signal having the defined pulse shape characteristics by progressively sweeping an output of the FGU over a range of frequencies from a first frequency to a second frequency within a first time period; and transmits at least one iteration of the first part of the location signal.
Abstract:
A method for enabling group communications includes: establishing a group identity for a communication group comprising a first set of communication devices, and storing an identity for each of the communication devices in the first set; establishing a session to associate a second set of communication devices with the group identity, wherein the communication devices in the second set are different from the communication devices in the first set, wherein the session with the second set of communication devices is set up irrespective of a call being initiated for the communication group; detecting a first event associated with the initiation of a call for the communication group; and in response to detecting the first event, using the stored identities to join at least one of the communication devices in the first set to the session.
Abstract:
A repeater receives (202) and repeats (204), on a multi-site channel, a sequence of control and media transmissions included in a session, wherein the session has a plurality of participants. While repeating these transmissions, the repeater further detects (206, 208), from at least one of the transmissions, a start of the session and a type of the session. Based on the type of the session, the repeater determines (212) whether to perform (216) an arbitration during the session to control access to the multi-site channel, and restricts each performed arbitration to only transmissions received from the participants to the session. In addition, after repeating at least one of the control transmissions, the repeater sets (210) a hang time having a duration that is determined based on a type of the transmission preceding the setting of the hang time.
Abstract:
An amplifier (100) that amplifies an input signal and provides the amplified signal to a load (114) at a summing junction (110) that has a first impedance value. The amplifier includes a splitter network (102) receiving the input signal and providing a phase delayed signal and an undelayed signal; a carrier amplifier path amplifying the phase delayed signal and including a carrier amplifier (106) and a first output match network (108) coupled between the carrier amplifier and the summing node; and a peaking amplifier path amplifying the undelayed signal and including a peaking amplifier (118), a second output match network (120) coupled to the peaking amplifier, and a phase delay element (122) coupled between the second output match network and the summing node, wherein the phase delay element provides a degree of phase delay and has a designed characteristic impedance value that is larger than the first impedance value for increasing the off-state impedance of the peaking amplifier.
Abstract:
A frequency synthesizer (100) includes: a frequency source generating a reference signal (107) that includes a plurality of pulses having periodicity based on a reference frequency; a feedback loop that includes, a phase detector circuit (119), a loop filter (120), a controlled oscillator (121) that generates an output signal at an output (112), and a loop divide circuit (122); a non-linear circuit element (103) at an input of the phase detector circuit (119), which generates intermodulation distortion that causes at least one spurious signal at the output; and a controller (106) controlling the loop divide circuit (122) and the non-linear circuit element (103). The frequency synthesizer further includes a dither circuit (101) that adjusts the timing of some of the pulses of the reference signal based on a parameter provided by the controller (106) to the non-linear circuit element (103), thereby, providing a jittered reference signal to the non- linear circuit element (103) for attenuating the at least one spurious signal at the output.
Abstract:
A method (500) of demodulation, the method comprising the steps of receiving (510) a radio frequency signal, converting (520) the received radio frequency signal to a baseband signal, performing (530) symbol timing recovery on the baseband signal, and demodulating (540) the baseband signal. The baseband signal comprises alternating symbols spaced therebetween at an alternating first interval length and a second interval length, where the first interval length and second interval length are dissimilar. Communication units and a method of modulation are also described.
Abstract:
A method and apparatus for mitigating the effect of adjacent channel interference in a multicarrier modulation system is provided. The method includes receiving (402) an encoded signal over multiple subcarriers at different frequencies. The signal includes a plurality of pilot symbols and data symbols modulated onto the subcarriers using a modulation technique. Further, the method includes: grouping (404) the subcarriers into multiple sets of subcarriers based on their frequencies, wherein each set includes one or more subcarriers; estimating (406), for each set of subcarriers, a noise value associated with at least a portion of the pilot symbols received over subcarriers included in the set; and generating (408) a decoded signal comprising a plurality of decoded data bits, using the estimated noise values.
Abstract:
A transmission capability of a mobile station that requests to be affiliated with a talk group is received. It is then determined whether to alter a current transmission mode of the talk group based at least in part upon the transmission capability of the mobile station, the current transmission mode of the talk group, and the transmission mode of one or more radio frequency (RF) sites associated with the talk group.