118results about How to "Improve transceiver performance" patented technology

The present invention is a method and apparatus for optimizing performance of a transceiver selecting and processing an intermediate frequency free of significant interference, such as noise. A frequency band may be scanned to detect interference upon which an intermediate frequency free of significant interference may be selected. This may enhance performance of the receiver by reducing the effects of noise. Additionally, perrformance may be further optimized by adjusting the passband of the filter such that the center of the passband matches the selected intermediate frequency. This may provide stability as centering of the passband may account for process, voltage and temperature variations and errors. Further, performance may be enhanced by ensuring desirable signal attributes are passed through the filter.

A gatherer device of wireless ad-hoc network meter reading system comprises a processor unit, a 485 bus interface unit, a wireless transmitting-receiving unit, and a power supply managing unit; wherein the processor unit is responsible for operation and control of the whole device, the 485 bus interface unit is used for connecting one or multiple electric meters, the wireless transmitting-receiving unit is responsible for interacting data and commands with a concentrator of the wireless ad-hoc network meter reading system, and the power supply managing unit supplies power for the whole device. An operation method of the gatherer device comprises that a command is received by the wireless transmitting-receiving unit and transmitted to the processor unit for processing, that the processor unit sends a request frame to an electric meter, that the processor unit receives a response frame from the electric meter and analyzes the response frame to acquire information of electricity consumption, and that finally the information of electricity consumption is returned to the concentrator through the wireless transmitting-receiving unit. The device and the method in the invention solve problems that the prior micropower wireless communication meter reading manners have much channel interferences, and are relatively low in security, relatively short in communication distances and not well in penetrating capabilities. Furthermore, the device has the advantages of low cost, high cost performance, good instantaneity, safety and reliability, and use and maintenance conveniences.

An embodiment of the invention discloses an integrated antenna package structure, which comprises a first substrate and a second substrate, wherein a first patch antenna is arranged on a first surfaceof the first substrate, the second substrate is connected to one side of a second surface of the first substrate, the second substrate is provided with a third surface and fourth surface which are opposite, the second surface is provided with a second patch antenna, a projection of the second patch antenna on the first surface is at least partially overlapped with the first patch antenna, a cavity is formed between the first and second substrates, the second patch antenna is separated from the second surface through the cavity, and the fourth surface is provided with a radio frequency component which is used for transmitting and receiving a radio frequency signal through the first patch antenna and the second patch antenna. The integrated antenna package structure has the advantages of low cost and large bandwidth.

Systems and methods for controlling the modulation current of a laser included as a component of an optical transmitter, such as an optical transceiver module, are disclosed. Control of the modulation current, which affects various laser operational parameters, including extinction ratio and optical modulation amplitude, enables operation of the laser to be optimized, thereby enabling reliable transceiver performance to be achieved. In one embodiment, a method for modifying the modulation current in an optical transceiver module includes first sensing analog voltage data that proportionally relates to an actual modulation current of the laser. Once sensed, the analog voltage data are converted to digital voltage data. Using the digital voltage data, the actual modulation current of the laser is determined, then a desired modulation current is determined. Should a discrepancy exist between the actual and desired modulation currents, the actual modulation current is modified to match the desired current.

The invention discloses an antenna apparatus for a wearable device and a wearable device. The antenna apparatus is composed of a first antenna, a second antenna, a first change-over switch, and a radio frequency unit. The first change-over switch and the radio frequency unit are arranged on a PCB; and one end of the first change-over switch is connected with the second antenna and the other end isconnected to the radio frequency unit or a reference ground on the PCB in a switchable manner. If the first antenna works at a frequency band less than a preset threshold, the radio frequency unit isused for controlling the other end of the first change-over switch to be switched to the reference ground. And the radio frequency unit is also used for controlling the other end of the first change-over switch to be switched to the radio frequency unit when receiving an instruction for indicating the second antenna to receive and send signals. According to the antenna apparatus, the second antenna in a non-working state is used as an extended reference ground of the first antenna in a working state, so that the receiving and sending performances for signals with the frequency bands less thanthe preset threshold of the first antenna are improved.

The invention discloses a switching method of a terminal antenna, a device and a mobile terminal. The method comprises the following steps: determining whether a terminal communicates based on a preset communication frequency band; if determining that the terminal communicates based on the preset communication frequency band, acquiring a signal intensity value of the preset communication frequency band; when judging that the signal intensity value is less than a preset signal intensity threshold, detecting whether an external antenna is accessed into the terminal; if detecting that the external antenna is accessed into the terminal; controlling the terminal to switch to the external antenna to communicate. Therefore, the terminal is controlled to switch to the external antenna to communicate when a low-frequency band signal received by a built-in antenna of the terminal is bad. Since the frequency band range of the external antenna is wider than that of the built-in antenna of the terminal, and the performance of the external antenna is better than that of the built-in antenna, the terminal is controlled to switch to the external antenna to communicate, thereby effectively improving the transmitting-receiving capacity of the terminal to the low-frequency band signal.

An embodiment of the invention provides a data transmission method and a data transmission device. The data transmission method comprises the steps of: modulating information bits to be transmitted according to a lower-order constellation diagram to generate 4m lower-order modulation symbols; multiplying a precoding matrix Q with column vectors formed by the 4m lower-order modulation symbols to obtain 4m higher-order modulation symbols to be transmitted corresponding to a higher-order constellation diagram; and transmitting the 4m higher-order modulation symbols to be transmitted on different corresponding carriers of two antennas separately. The higher-order modulation symbols to be transmitted contain a part of or all of the information bits to be transmitted, and therefore, the same signal can be simultaneously transmitted on different carriers of a plurality of antennas, thereby achieving frequency diversity and space diversity, and accordingly improving the transmission and receiving performance of data transmission.

The invention relates to a MIMO onboard communication system performance evaluation method. A multi-hop scattering model is equivalent to a single-point scattering model through geometric transformation based on a traditional ellipse model through the system, and the performance of a MIMO multi-antenna system is evaluated through the spatial fading correlation, the channel capacity and the Doppler parameter; a receiving end of the MIMO onboard communication system is that at least one group of array elements is a circular array of an omnidirectional antenna; and the system performance is evaluated according to three information parameters of the spatial fading correlation function as shown in description, the MIMO multipath channel capacity as shown in description and the Doppler spectrum distribution function as shown in description. The MIMO onboard communication system disclosed by the invention has the advantages that three performance evaluation parameters of the spatial fading correlation coefficient, the MIMO multipath channel capacity and the Doppler parameter are introduced to analyze the advantage of a transmitting end directional antenna array relative to the omnidirectional antenna array; the system performance of the directional antenna array is superior to the system performance of omnidirectional antenna array by discovering from the relation between the system performance and the Poda signal distribution and the directional antenna beam direction.

The invention provides a single-phase control node device of a wireless sensor network which relates to the technical field of the wireless sensor network of various applications such as livestock facility cultivation and environmental monitoring for plant facility cultivation, etc. The device consists of a data communication part and an executive equipment driving part, wherein, a storage unit and a wireless transceiver, etc. in the data communication part are respectively connected with a processor unit; a silicon-controlled triggering unit and an executive equipment state output unit in the executive equipment driving part are respectively connected with the silicon-controlled control unit and connected with the processor unit of the data communication part respectively by corresponding interfaces thereof; the wireless transceiver unit of the device sends a base station control command sent by the sensor network to the processor unit for processing and controls the turn on or off of the executive equipment by the silicon-controlled control unit; the processor unit acquires the state information of the executive equipment by a state output unit of the executive equipment and carries out processing at the base station by a router of the sensor network through the wireless transceiver unit.

The invention discloses a follow-up tracking WIFI transmission device and a control method thereof. The device includes a cloud deck controller, and an acceleration sensor, a geomagnetic sensor, a Beidou navigation receiver, a wireless communication unit, a WIFI unit and an antenna cloud deck connected to the cloud deck controller. The device also includes a directional antenna arranged on the antenna cloud deck. The directional antenna is connected to the WIFI unit. The control method includes determining the coordinates of the device itself through Beidou satellite signals and sending the coordinate information to other access points; determining an optimal communication chain according to the combination of a routing algorithm and the coordinate information of the whole communication access point combined; determining the posture information of the device itself through the geomagnetic sensor; calculating the antenna azimuth angle and controlling the antenna cloud deck for antenna alignment. According to the invention, long range WIFI communication is realized and a problem of dynamic moving network construction of multiple access points when using the directional antenna is solved. Effects in aspects of prolonging WIFI communication distance, improving communication security, improving network invulnerability, reducing electromagnetic interference and the like are obvious.

The invention discloses an MIMO multiantenna communication system. The system comprises a transmitting end and a receiving end. The transmitting end and the receiving end are equipped with uniform spherical MIMO antenna arrays. The invention also provide a performance evaluation method for the MIMO multiantenna communication system. The provided system is described through scatterer Gaussian distribution. A spatial Gaussian distribution density function expression is determined. A joint probability density function of an angle of divergence (AOD) of a single-time bounce SBM component is expressed. An edge PDF of the angle of divergence (AOD) of a single-time bounce path SBM in the system is provided through utilization of integral of the joint PDF on a path length interval component. Fourier transform is carried out on pulse response h<pq>(t) to obtain a time varying transfer function. A frequency cross-correlation function is expressed. According to the system and the method, throughimporting of the spatial autocorrelation function, and temporal and frequency cross-correlation functions between two array elements pq, performance of the MIMO multiantenna communication system is evaluated, and the performance of terminal antenna arrays and a wireless communication system is optimized.

The invention discloses a radio frequency circuit and electronic equipment, and the radio frequency circuit comprises a radio frequency transceiver, a first radio frequency module, a second radio frequency module, a third radio frequency module, a combiner module, a first switch assembly, and a first antenna. The radio frequency transceiver is electrically connected with the first end of the first radio frequency module, the first end of the second radio frequency module and the first end of the third radio frequency module. A first port of the combiner module can be electrically connected with a second end of the first radio frequency module or a second end of the second radio frequency module through the first switch assembly, a second port of the combiner module is electrically connected with a second end of the third radio frequency module, and a third port of the combiner module is electrically connected with the first antenna; and under the condition that the first antenna receives the first radio frequency signal and the second radio frequency signal, the combining module is used for transmitting the first radio frequency signal to the third radio frequency module and transmitting the second radio frequency signal to the first radio frequency module or the third radio frequency module. Therefore, the number of antennas of the radio frequency circuit can be reduced.

The invention discloses a performance evaluation method for an MIMO (Multiple Input Multiple Output) multi-antenna system and the multi-antenna system. The system assumes that a channel matrix complies with a zero-mean spatial white noise model at the transmitting end, and a group of linear arrays of which array elements are directional antennae are arranged at the receiving end of the system. According to the performance evaluation method for the MIMO multi-antenna system, the directional antenna array elements are introduced into linear antennae, so that a spatial statistics channel model is effectively expanded, the transmitting and receiving performances of an MIMO multi-antenna array are deepened, and the performances of a terminal antenna array and a wireless communication system are optimized; by introduction of spatial fading correlation coefficients and performance evaluation parameters such as MIMO multi-path channel capacity and error code rate, the advantages of a directional antenna array relative to an omnidirectional antenna array are analyzed, and the system performance of the directional antenna array is superior to that of the omnidirectional antenna array according to a relationship among the system performance, the distribution of arrival signals and the direction of a directional antenna beam.

The present invention provides a terminal signal transmit-receive device. The device comprises a master antenna and an auxiliary antenna which are used for transmitting and receiving radio frequency signals, a master antenna matching circuit and an auxiliary antenna matching circuit which are respectively connected with the master antenna and the auxiliary antenna, a combiner configured to overlap the signals received by the master antenna and the auxiliary antenna and a power divider configured to distribute signals emitted by the terminals and send the signals to the master antenna and the auxiliary antenna. The auxiliary antenna can effectively improve the transmit-receive performance of signals of a terminal.

The invention provides a wireless device and a manufacturing method of antenna thereof. The wireless device comprises a shell and a printed circuit board (PCB), wherein, a conducting material is applied to the inner side of the shell; one end of the conducting material is connected with a grounding point of the PCB, the other end of the conducting material is connected with a feed point of the printed circuit board; and the printed circuit board between the ground point and the feed point and the conducting material form the antenna of the wireless device. By the processing, the method saves materials and space of the built-in antenna on the PCB and improves the transceiving performance of the antenna.