203 results about "ISM band" patented technology

Multi-mode hardware that supports both Wireless LAN and Wireless PAN standards in the 2.4 Ghz ISM band are becoming available. This invention discloses a multi-standard wireless driver that includes a Multi-standard Wireless Adaptation Layer (M-WAL) with the capability to efficiently handle concurrent operation of multiple wireless transceivers while reducing mutual interference and matching application traffic requirements. The multi-standard Wireless Adaptation Layer is a virtual device driver that is not limited to networking applications but also takes other application profiles into account, such as those described in the Bluetooth standard.

A method, terminal, and computer program are disclosed to reduce radio interference in a wireless communications device having a combination of a wireless telephone unit, such as a GSM cellular phone, and a short range wireless communications unit, such as a WLAN communications unit or a Bluetooth communications unit. An interference avoidance subsystem in the wireless communications device is connected between the GSM frequency hopping logic and the Bluetooth frequency hopping logic. Bluetooth frequency hopping information and time domain operation information are input from the Bluetooth frequency hopping logic to the interference avoidance subsystem. GSM frequency hopping information and time domain operation information are input from the GSM frequency hopping logic to the interference avoidance subsystem. The interference avoidance subsystem then uses this input data to calculate the interference probability between co-existing Bluetooth received signals and GSM transmitted signals. The interference avoidance subsystem then compares the calculated interference probability with the required Bluetooth packet error rate limit for the current application. If the interference probability exceeds the required Bluetooth packet error rate limit, the interference avoidance subsystem sends a signal to the Bluetooth frequency hopping logic to change the Bluetooth frequencies.

Disclosed herein is a multi-band ZigBee transceiver for supporting IEEE 802.15.4 wireless communications. In the multi-band ZigBee transceiver, a Multi-Mode Modem (MMM) selects any one of a European version standard using 860 MHz band, a US version standard using 920 MHz band, and a worldwide version standard using 2.4 GHz ISM band among IEEE 802.15.4 standards. A frequency synthesizing unit variably adjusts a carrier frequency according to the transmission standard. A transmission unit receives a digital modulated signal, low-pass-filters the digital modulated signal with a bandwidth thereof being variably adjusted, and up-converts the filtered digital modulated signal into an RF modulated signal corresponding to the selected transmission channel. A receiving unit down-converts the RF modulated signal into a BB modulated signal using the carrier frequency, low-pass-filters the BB modulated signal with a bandwidth thereof being variably adjusted according to the selected transmission standard, converts the filtered BB modulated signal into a digital modulated signal, and outputs the digital modulated signal to the MMM. A transmission / reception switch unit outputs the RF modulated signal, input from the transmission unit, to an antenna, or outputs the RF modulated signal, received from the antenna, to the receiving unit.

Five circuit topologies of Voltage-Controlled Oscillators with Single Inductor (VCO-1L) are proposed. They offer lower power consumption, higher output amplitude, broader tuning range, cleaner s-rum and higher frequency stability seen as lower phase-noise. Most of the achievements are based on the development of active pull-down control circuitries of the timing and active charge dissipation in the transistors. The applications of the present invention are of critical importance for wireless communication systems not allowing any limitations in the frequency range. Among them are base stations and mobile terminals mobile phones, GSM, PCS / DCS, W-CDMA etc., as well BlueTooth, Wireless LAN, Automotive and ISM band etc. The advanced performance of the circuits is based on important architectural specifics and proven by simulation on advanced CMOS process. The architectures are not limited to use on CMOS; they can be efficiently used in any semiconductor process where complimentary polarity transistors are available, for example BiCMOS, SiGe / BiCMOS, GaAs etc.

The invention provides a resource pre-scheduling method for a device-to-device (D2D) communication system working under industrial scientific media (ISM) frequency bands. The method comprises the following steps that: step 1: a central control node in a cellular network determines the total quantity of time frequency resources available to device-to device (D2D) communication after industrial scientific media (ISM) frequency band channels are successfully seized; step 2: each device-to-device (D2D) communication pair under the administration of the central control node reports resource occupation requirements of the device-to-device (D2D) communication pairs to the central control node to which the device-to device (D2D) communication pairs belong, and the central control node calculates time frequency resources scheduled for the device-to-device (D2D) communication pairs according to the requirements; and step 3: the central control node groups all device-to-device (D2D) communication pairs which are under the administration of the central control node, and performs resource pre-scheduling on each device-to-device (D2D) communication pair in each group and ensures that the sum of the quantity of the time frequency resources scheduled to all the device-to-device (D2D) communication pairs is not larger than the total quantity of the time frequency resources. With the resource pre-scheduling method of the invention adopted, resource sharing between device-to-device (D2D) communication pairs which competitively seize WLAN channels and other device-to-device (D2D) communication pairs can be realized, and orderly resource competition and channel occupation can be also realized, and resource competition within each group and between each group can be avoided.

According to the invention, a method and an arrangement is provided for digital radio transmission of data between a fixed station (1) and at least one mobile station (2, 3) at one of a plurality of carrier frequencies (f1, f2, etc.) the data being transmitted in time slots (Z1, Z2 etc.) using time-division multiplex method (TDMA) and, in particular if so-called slow hopping RF modules are used, the change from one carrier frequency to another carrier frequency requiring at least a time period corresponding to one time slot. According to the invention, the data are transmitted in two successive active time slots (Z1, Z2) which are followed by an inactive time slot, in which no data are transmitted. The transmission in two successive time slots (Z1, Z2) takes place at the same carrier frequency. If the method or the arrangement according to the invention are used for the purpose of matching the DECT standard to the US-American ISM band, six time slots for transmitting from the fixed station to at least one mobile station can be followed by six time slots for transmitting from the at least one mobile station (2, 3) to the fixed station (1).

The single-antenna radio frequency (RF), direction finding (DF) system includes a single-element directional antenna, which is mounted on a multi-rotor UAV (Unmanned Aerial Vehicle) and integrates with a DF algorithm for tracking an RF source in the 2.45 GHz ISM band (or any other frequency band). The algorithm will depend on the rotating nature of the platform to scan the azimuth, as well as several elevation angles with respect to the platform axis of rotation, and thus be able to accurately locate the coordinates of the RF transmitter based on the recorded power levels. The RF source determination step is performed during the search mode of the algorithm. The RF transmitter location is saved, and the UAV takes actions accordingly by commencing movement towards that location in the action mode of the algorithm. After some time, the UAV enters the search mode again in case the RF source has moved.

The present invention discloses a new type active radio frequency identification (RFID) system and its operation method. The described system includes active RFID tag, active reader and its communication protocol. Said system is worked at 2.45 GHz of ISM frequency channel, the described tag portion includes microprocessor, radio frequency receiving / sending chip, power supply management, real time clock (RTC) and antenna. The described reader mainly includes microprocessor, radio frequency receiving and sending chip, power supply management, real-time clock (RTC), liquid crystal display, external interface module and antenna, etc. At the same time it provides RS-232 interface, and can implement communication with PC machine.

A cathodic protection monitor is disclosed to be electrically connected to a cathodic protection rectifier that is adapted to prevent rust, corrosion and possible leakage in an underground pipe or storage tank above which the rectifier is supported. The cathodic protection monitor includes a CPU that reads, digitizes and stores analog current and voltage signals which are supplied from the DC output of the rectifier and are indicative of the effectiveness thereof. The monitor includes an ISM band transceiver and antenna by which the CPU is polled and from which packets of stored data are transmitted to a data collector at an overhead airplane or nearby motor vehicle for retransmission and analysis by the pipe owner or maintenance crew. Synchronized timing signals are supplied (from the National Bureau of Standards) to a stable auxiliary clock by way of a WWVB transceiver and antenna. The auxiliary clock from each of a plurality of cathodic protection monitors along the pipeline provides a synchronized clock control signal to a respective CPU which, in turn, generates a switched relay control signal to a relay of the cathodic protection rectifier. Accordingly, the relays of all of the cathodic protection rectifiers can be simultaneously energized and de-energized during successive time periods so that all of the cathodic protection rectifiers can be turned on and off at the same time as may be required to compile ground voltage readings along the pipeline as part of a government-mandated survey.

A frequency transverter (10) and method for enabling bi-frequency dual-directional transfer of digitally encoded data on an RF carrier by translating between a crowded or otherwise undesirable first frequency band, such as the 2.4 GHz ISM band, and a less-crowded or otherwise desirable second frequency band, such as the 5.0 GHz-6.0 GHz U-NII band. In a preferred embodiment, the transverter (10) connects between an existing data radio (11) and its existing antenna (30), and comprises a bandswitch (12); an input RF isolating device (14); a transmuter (16); a converter (18); a dual output local oscillator (20); an output RF isolating device (22); and an antenna (24) tuned to the second frequency band. The bandswitch (12) allows for bypassing the transverter (10), thereby facilitating its use with legacy systems. The transmuter (14) and converter (16) are adapted to convert to and from, respectively, the second frequency band.

The invention relates to a system for testing the performance of an ISM (industry, science and medicine) frequency range communication product and a testing method, and in particular relates to a system for testing the performance of a communication product and a testing method, and the problem of low testing accuracy of the existing method for testing the performance of the ISM frequency range communication product is solved. In the system provided by the invention, N transmitters to be tested and a reference transmitter are accessed to a chain through a No.1 multi-way switch and connected with N receivers to be tested and a reference receiver after passing through an adjustable attenuator, a fixed attenuator, a combiner and a shunt; and an oscilloscope displays the waveform of each receiver. In the method provided by the invention, the performance detection of the ISM frequency range communication product to be tested is realized by testing the sensitivity of the receivers to be tested, the transmission power of the transmitters to be tested, the same-frequency interference-resistant performance of the receivers to be tested, the multi-address interference-resistant performance of the receivers to be tested and the high and low temperature-resistant performance of the product to be tested. The invention is suitable for testing the performance of the ISM frequency range communication product.

Aspects of a method and system for classifying Bluetooth channels using a wideband receiver are provided. In this regard, FFT analysis may be utilized to detect signals / interference present in a sub-band of an ISM band and classify Bluetooth channels in that sub-band based on the detected signals. A co-located Bluetooth transceiver may utilize the classification to determine which Bluetooth channels comprise a best communication link for communicating via Bluetooth. In this regard, Bluetooth channels may be ranked in order of preference based on the classification. Preferred Bluetooth channels may provide more reliable Bluetooth communications. The ISM frequency band may be the 2.4 GHz ISM frequency band. The sub-bands may each comprise a WLAN channel. The Bluetooth channels may be classified based on strength, type, and / or a rate of recurrence of the detected signals. In addition to the FFT, a signal strength indicator may be utilized to detect signals / interference.

The invention discloses a V2I / V2V Internet-of-things system based on cognitive OFDM, comprising on-board units and roadside units. The on-board units and the roadside units are configured to carry out wireless communication based on an ISM frequency band to transmit video, voice and text data and provide traffic safety information and traffic condition information for drivers. The invention further provides a mobile ad hoc network information transmission method comprising the following steps: an information collection module starts collecting video, voice, text and other information, and a control host module compresses, codes, packages and modulates the information and sends the modulated information to a sending queue; a sender notifies a receiver in a control channel that the data is about to be sent; the receiver performs spectrum sensing, and feeds a carrier frequency and a subcarrier group of good channel quality currently back to the sender through the control channel; the receiver receives a packet of information, and demodulates and checks the information to obtain check information; and the receiver records the number of times of consecutive packet loss, and decides whether to perform spectrum sensing according to the number of times of packet loss.

The single-antenna radio frequency (RF), direction finding (DF) system includes a single-element directional antenna, which is mounted on a multi-rotor UAV (Unmanned Aerial Vehicle) and integrates with a DF algorithm for tracking an RF source in the 2.45 GHz ISM band (or any other frequency band). The algorithm will depend on the rotating nature of the platform to scan the azimuth, as well as several elevation angles with respect to the platform axis of rotation, and thus be able to accurately locate the coordinates of the RF transmitter based on the recorded power levels. The RF source determination step is performed during the search mode of the algorithm. The RF transmitter location is saved, and the UAV takes actions accordingly by commencing movement towards that location in the action mode of the algorithm. After some time, the UAV enters the search mode again in case the RF source has moved.

A backscatter passive wireless control system and method employs frequency coding using frequency components generated from an interrogating field using a passive nonlinear element such as a diode in a passive transponder tag. In particular, InterModulation Distortion (IMD) frequency components may be generated which are shifted in frequency from the interrogating signal to assist in backscatter detection at a receiver but are still in band, e.g., in an ISM band. The shifted frequency components may be swept or stepped over a range and passive elements in the tag encode a tag ID by selecting specific frequencies to be backscattered. A manually operated switch may couple an antenna to the transponder to allow battery free control.

The invention provides a two point four gigahertz full-channel data collection and protocol analysis instrument based on the IEEE802.15.4, and relates to the technical field of wireless sensor networks. The system comprises 16 radio frequency receiving modules. Each radio frequency receiving module is in charge of unceasingly monitoring whether a wireless data message exists in a channel of the network in the 2.4 GHz ISM band or not. A data management module reads an interrupt mark in a wireless module through polling, reads the data message from the FIFO of the corresponding radio frequency receiving module, detects whether the data message confirms to the standard format of the wireless data message or not and processes the data message. The data message enters a corresponding analysis module according to a selected protocol, data packet information is analyzed field by field, the analyzed information is stored in a database to form a new data message, and the new data message is uploaded to an upper computer by calling an application program. The system further has the channel scanning function, and quality index numbers of all current channels can be obtained in real time.

A method and system for establishing a non-frequency-hopping connection link between a slave device with another slave device in a communications network having a plurality of frequency channels within a radio frequency band known as the unlicensed ISM band, wherein the connection links between slave devices are capable of being carried out in a frequency-hopping fashion. The non-frequency-hopping connection link can be established after the channel conditions, including the carrier power of the channel and the interference and noise levels adversely affecting the connection link, are measured.

A method for identifying interferers in a radio communication band, such as the 2.4 GHz ISM band, uses a priori information of the interferers such as channel structure, channel frequency and channel bandwidth. Measured RSSI can be used to detect and identify interferers. RSSI measurements can be made at multiple frequencies within a channel of the interferer. Randomization of RSSI measurements improves the likelihood of interferer detection and identification if such interferer is present. Metrics other than RSSI can be used.

Examples described herein include devices and systems utilizing backscatter communication to directly generate transmissions in accordance with wireless communication protocols that can be decoded existing devices. Examples include devices that generate 802.11b transmissions using backscatter communication. Examples of network stacks are described which may facilitate backscatter devices to coexist with other devices (e.g. in the ISM band), without incurring, or reducing a need for, the power consumption of carrier sense and medium access control operations.

Apparatus and method for transmitting a supervisory signal for optical network applications. The apparatus includes a subcarrier transmission system configured to receive a first supervisory signal and output a second supervisory signal, and an electrical-to-optical conversion system configured to receive the second supervisory signal and a data signal and output an optical signal. The second supervisory signal is associated with a subcarrier frequency. The data signal is associated with a data bandwidth, and the data bandwidth includes a data frequency. At the data frequency, a power density of the data signal is substantially equal to zero. A ratio of the subcarrier frequency to the data frequency ranges from 0.8 to 1, and the subcarrier frequency ranges from 2.4 GHz to 2.483 GHz.

The invention provides a system and method for testing antijamming capability of wireless communication products operating at ISM (Industry, Science and Medical) frequency range, which relates to the method and the method for testing antijamming capability of wireless communication products and solves the problem that the antijamming capability of wireless communication products operating at ISM frequency range can not be tested. The system works as follows: signals transmitted by a transmitter are input into a receiver after passing through a first adjustable attenuator and a first combiner;signals transmitted by a signal source are input into the receiver after passing through a second adjustable attenuator and a second combiner. The method comprises the steps of: simulating signals ofcommon radio communication systems near and in communication product working frequency bands through a signal source; and observing error code conditions of a receiver to be tested by adopting receiver error coder characteristic testing equipment to obtain a desired signal power and an interference signal power of each system and further realize quantitative analysis on the antijamming capabilityof the wireless communication products operating at ISM frequency range. The invention is applicable to testing the antijamming capability of the wireless communication products operating at ISM frequency range.

The present invention provides a portable and compact battery-powered stereo speaker assembly that incorporates a DC to DC converter, which enables power from the internal stereo speaker assembly battery to charge an interconnected hand-held device, such as a smartphone, through a USB connection, thereby extending the time that the device can be used untethered from the AC power grid. A DC to DC converter enables the charging function can be implemented even if the speaker assembly is not connected to the AC power grid, and even if the battery of the stereo speaker assembly is not fully charged. The stereo speaker assembly also incorporates Bluetooth connectivity, a proprietary open wireless technology standard, developed by Ericsson in 1994, employing frequency-hopping spread spectrum radio transmissions in the ISM band from 2400-2480 MHz.

The invention discloses a multistage radio frequency power amplifier circuit capable of reducing interference on an ISM frequency band. One or a plurality of resonant filter matching networks are arranged among stages of a multistage radio frequency power amplifier, the resonant filter matching networks enable power of succeeding impedance of the radio frequency power amplifier matched with a front power amplification tube to output a load value and simultaneously are applied to inductance and capacitance (LC) resonant network resonance to ISM frequency band frequency and / or offset frequency of radio frequency band and the ISM frequency band. The multistage radio frequency power amplifier circuit capable of reducing the interference on the ISM frequency band enables the multistage radio frequency power amplifier to effectively reduce the interference on the ISM frequency band without reducing overall efficiency and solves coexisting problems of radio frequency signals and ISM frequency band signals.

An automatic pulse detector compares a radar video pulse to a delayed and amplified version of itself. The radar video pulse serves as an amplitude reference for a comparator. A delayed and amplified version of the same pulse serves as the pulse to be detected. Time of detection is amplitude independent and is not degraded by flat-topped pulses. Pulse detection occurs at a fixed, fractional point on the leading edge of a pulse where noise has less temporal influence than at the top of a pulse. Unlike a time-of-peak detector, the self-referencing pulse detector is well-suited to detecting wide, flat-topped pulses produced by expanded-time, pulse-echo radars operating in relatively narrow ISM bands.

The invention discloses method for testing sensitivity of a wireless communication product in an ISM (Industrial, Scientific and Medical) frequency band, relating to methods for testing the sensitivity of the wireless communication products and solving the problem of low accuracy in a sensitivity test because the traditional method cannot simulate an actual condition. In a system I, signals emitted by an emitter are input into a receiver through an adjustable attenuator and a fixed attenuator. In a method I, the error rate from the adjustable attenuator to the receiver is adjusted to determine whether a preset error range is reached, and the sensitivity of the receiver is calculated. In a system II; the signals emitted by the emitter are input into the receiver after being processed by the adjustable attenuator I, a power distributor, a combiner and N adjustable attenuators II. In a method II, the reference attenuation values of the adjustable attenuators are respectively adjusted, the length of a transmission line is adjusted to make the receiver in a critical state, and a power meter is adopted to test the received signal power of the receiver and calculate the sensitivity of the receiver. The systems and methods disclosed by the invention are suitable for testing the sensitivity of the wireless communication products in the ISM frequency band.