30 results about "Pair gain" patented technology

A method of controlling downlink transmissions to a subscriber station capable of communicating with a base station of an orthogonal frequency division multiplexing (OFDM) network. The method comprises the steps of: receiving a first pilot signal from a first base station antenna; receiving a second pilot signal from a second base station antenna; and estimating the channel between the base station and subscriber station based on the received first and second pilot signals. The method also comprises determining a set of OFDM symbol processing parameters based on the step of estimating the channel and transmitting the OFDM symbol processing parameters to the base station. The base station uses the OFDM symbol processing parameters to control the relative gains and the relative delays of OFDM symbols transmitted from the first and second antennas.

A method for controlling power of an uplink physical channel includes: computing a relative gain factor in a compressed mode; correcting the relative gain factor to obtain a corrected relative gain factor; generating a gain factor in the compressed mode according to the corrected relative gain factor; controlling power of the uplink physical channel according to the gain factor in the compressed mode generated. In embodiments of the present invention, after being computed, the relative gain factor in the compressed mode is corrected, then the gain factor in the compressed mode is generated according to the corrected relative gain factor. Thus, an accurate gain factor may be acquired for controlling the power of the uplink physical channel.

A programmable active frequency-selective circuit includes a first capacitor having a fixed value and a second capacitor having a value defined by a product of a parameter and a plurality of switchable capacitors, wherein the parameter is defined by a gain, a bandwidth mode, and a process resolution. The parameter may be stored in a form of a look-up table and enables a user or manufacturer to program the gain, select the bandwidth mode and tune the process. The frequency-selective circuit may include a differential input and a differential output having a first feedback path connected across a positive output terminal to a negative input terminal and a second feedback path connected across a negative output terminal and a positive input terminal.

A differential pair gain stage is disclosed. In one embodiment, the gain stage includes a differential pair of depletion-mode transistors, including a first and a second n-type transistor. In certain embodiments of the invention, the depletion mode transistor may be GaN (gallium nitride) field effect transistors. The gain stage includes an active load including one or more depletion mode transistors electrically coupled to at least one of the drains of depletion mode transistors of the differential pair. The active load may include a source follower for maintaining the AC voltages at the drains of the differential pair at a constant value and may further include a casocde stage for setting a fixed drain source voltage across the output transistors to increase the output impedance and gain of the stage.

An embodiment of the invention discloses a radio frequency power amplifier based on a transformer matching network. The radio frequency power amplifier comprises an input matching network, a first-stage single-path amplifying circuit, a first inter-stage matching network, a second-stage double-path amplifying circuit, a second inter-stage matching network, a third-stage four-path amplifying circuit and an output matching network which are connected in sequence, wherein the first inter-stage matching network comprises a first transformer T1, the second inter-stage matching network comprises two second transformers T2, and the output matching network comprises two third transformers T3 and a fourth transformer T4. According to the invention, transformer matching is adopted for inter-stage matching and output matching, so a layout area is effectively reduced, additional insertion loss is avoided, and the optimization effect on gain and output return loss is remarkably improved.

A method of controlling downlink transmissions to a subscriber station capable of communicating with a base station of an orthogonal frequency division multiplexing (OFDM) network. The method comprises the steps of: receiving a first pilot signal from a first base station antenna; receiving a second pilot signal from a second base station antenna; and estimating the channel between the base station and subscriber station based on the received first and second pilot signals. The method also comprises determining a set of OFDM symbol processing parameters based on the step of estimating the channel and transmitting the OFDM symbol processing parameters to the base station. The base station uses the OFDM symbol processing parameters to control the relative gains and the relative delays of OFDM symbols transmitted from the first and second antennas.

A control device (CD) is dedicated to the control of the transmission of coded values onto a digital interface (I) connecting a baseband device (BBD) and a baseband interface device (BAI), comprising at least a modulator (M) feeding a gain controller (GC), of a wireless communication equipiment. The control device (CD) comprises a storing means (MM1) for storing a coding table establishing a correspondence between symbols for the baseband interface device (BAI) and coding values to transmit to this radiofrequency device through the digital interface (I). Tie coding table comprises a first group of symbols comprising data words for feeding the modulator (M) and a second group of symbols comprising command words for controlling the operation of the modulator (M) and / or the gain controller (GC). The control device (CD) also comprises a control means (CRM) arranged, when it receives a symbol from the baseband device (BBD), to determine in the storing means (MM 1) the coded value corresponding to this symbol in order it could be transmitted to the baseband interface device (BAI) through the digital interface (I).

One embodiment of the invention discloses a time synchronization receiver system, which comprises a capture unit, a tracking unit, a resolving unit and a preprocessing unit, and is characterized in that the preprocessing unit utilizes an all-digital feedforward automatic gain control algorithm to adjust the amplitude of a received A / D sampling signal; and the data information of the A / D sampling signal occupies a high data bit as much as possible, and performing bit cutting processing on a low data bit of the A / D sampling signal to obtain an output signal. The preprocessing unit is additionally arranged at the receiving end, the amplitude of the received signal is adjusted through full-digital automatic gain control based on gain judgment, data information of the received signal occupies a high data bit as much as possible, bit cutting processing is carried out on gain-adjusted data on the basis that the effective bit number and the output dynamic range of the received signal are guaranteed, and therefore, the resource occupation problem of the algorithm is optimized, and the time synchronization precision performance and resource occupation of the receiver are both considered.

A differential pair gain stage is disclosed. In one embodiment, the gain stage includes a differential pair of depletion-mode transistors, including a first and a second n-type transistor. In certain embodiments of the invention, the depletion mode transistor may be GaN (gallium nitride) field effect transistors. The gain stage includes an active load including one or more depletion mode transistors electrically coupled to at least one of the drains of depletion mode transistors of the differential pair. The active load may include a source follower for maintaining the AC voltages at the drains of the differential pair at a constant value and may further include a casocde stage for setting a fixed drain source voltage across the output transistors to increase the output impedance and gain of the stage.

The application discloses a gain control method, device and circuit based on a receiver and a terminal. The method comprises the following steps: performing gain control processing on an input signalaccording to a predetermined gain parameter to obtain a to-be-processed signal after gain adjustment; carrying out frequency mixing processing on the to-be-processed signal to obtain a corresponding carrier I-path signal and a corresponding carrier Q-path signal; respectively performing analog-to-digital conversion processing on the carrier I-path signal and the carrier Q-path signal to obtain a digital I-path signal and a digital Q-path signal; performing peak detection processing on the digital I-path signal and the digital Q-path signal, and determining whether gain parameters need to be adjusted or not according to a peak detection processing result; and if not, performing gain fine adjustment control on the digital I-path signal and the digital Q-path signal. According to the embodiment of the application, through twice gain control processing, the problem of poor signal stability after gain processing caused by multipath fading or receiver distance and the like of signals in theprior art is solved.

The invention provides a line loss contribution degree analysis method and system based on a relative gain principle. The method comprises the following steps: firstly, carrying out key characteristicindex analysis on a typical network structure of a low-voltage transformer area; obtaining open-loop gain and closed-loop gain from each key characteristic index to the line loss of each element by using a control variable method; combining the properties and the characteristic indexes of the relative gain matrix with the relative gain matrix of the line loss of each element; and finally, extracting line loss contribution degree information of each key characteristic index according to the relative gain matrix. Compared with a traditional analysis method, the method has the advantages that data mobility is high, effective information of related data can be extracted in line loss management, the relative gain principle is applied, the calculation method of the contribution degree of the key feature indexes is researched, contribution degree information of the key feature indexes to line loss is extracted, and support is provided for subsequent energy conservation and loss reduction.

The invention provides a precoding matrix processing method and a communication device. The method comprises the following steps: enabling the terminal equipment to determine a codebook coefficient of a precoding matrix; and grouping the ports corresponding to the precoding matrix to obtain a plurality of port groups. By grouping the ports, the ports with large energy difference are divided into different port groups. The terminal equipment can perform gain adjustment on the codebook coefficients corresponding to the plurality of port groups by adopting different gain adjustment coefficients, and performs quantization processing on the codebook coefficients after gain adjustment; or, the terminal equipment can perform quantization processing on the codebook coefficients corresponding to the plurality of port groups, so that the network equipment can determine the precoding matrix according to the quantized codebook coefficients. Therefore, feedback precision reduction caused by loss of codebook coefficients of part of ports with small energy can be avoided. Therefore, higher feedback precision can be obtained, and the transmission performance of the system can be improved.

The invention discloses a multi-user resonant optical communication system and method based on frequency division multiple access, including a base station (1) and a mobile terminal (2), the mobile terminal includes transceivers located at different users; the base station Including a first retro-reflector (11), a first gain medium (12), a first electro-optic modulator (13), a first beam splitter (14), a frequency diversity module (15), a second photodetector (18 ), a first synchronization device (19) and a plurality of diversity processing devices; the transceiver includes a second retro-reflector (21), a second gain medium (22), a second beam splitter (23), a third A photodetector (24), a coupler (25), a second signal processing board (26), a second synchronization device (27) and a second electro-optic modulator (28). By dividing the gain bandwidth, the present invention realizes that multiple users communicate with the base station without interference at the same time, and provides convenience for the application of resonance optical communication in multi-user scenarios.

A method for selecting a relation between a gain Gf of a Forward Raman Amplifier (FRA) at a transmitting end of a fiber optic transmission line and an optical signal to noise ratio (OSNR) at a receiving end of the fiber optic transmission line satisfying limitations for real long transmission lines. The method comprises selecting the relation using a regulation function ROSNR obtained either in the form of a simplified equation, or in the form of one or more linear approximations of the function for practical ranges of the FRA gain.

Method and apparatus for altering a round trip delay measurement in a multiple subscriber carrier pair gain system to accurately position echo cancellation where the overall delay is measured by the near end modem and when this measurement is made, it is detected to alter local delays by bypassing filters and buffers to momentarily shorten the overall delay until the measurement is completed. Alternatively, the return signal is interrupted and the round trip delay response is simulated when a round trip delay measurement is being made. In this manner, the simulated signal is received at the originating end and used for delay measurement resulting in a shorter delay being measured.

The invention relates to a nonlinear damage compensation method and system in a long-distance optical communication system. The method includes: performing gain adjustment on a complex signal at a receiving end, and outputting a gain signal; dividing the gain signal by spans and steps to obtain the step number division Perform dispersion compensation and nonlinear phase compensation on the gain signal divided by the number of steps, and output the signal to be judged; perform logistic regression judgment on the signal to be judged to determine the judgment result; the judgment result is that the compensation meets the standard or the compensation fails to meet the standard. ; When the judgment result is that the compensation does not meet the standard, the loss value is determined according to the judgment result; the nonlinear compensation coefficient of the nonlinear phase compensation is adjusted according to the loss value to perform cyclic compensation; when the judgment result is that the compensation reaches the standard, the gain signal completes the compensation. The present invention can reduce the overall complexity while ensuring the signal compensation accuracy.

The embodiment of the invention discloses a beam transmission method and related equipment, and the method comprises the steps that terminal equipment transmits at least one group of spatial sampling information to network equipment, each group of spatial sampling information comprises an identifier of a transmitting beam of the network equipment, an identifier of a receiving beam of the terminal equipment, and at least one of a beam pair gain, a signal transmission delay, a spatial position and a moving speed between the transmitting beam and the receiving beam; the at least one group of spatial sampling information is used by the network equipment to determine a beam forming vector, and the beam forming vector is used for communicating with the terminal equipment. By adopting the embodiment of the invention, the network access efficiency can be improved, and the data transmission performance can be improved.

The invention discloses an interference signal suppression device, which comprises a low noise amplifier module, a signal conversion module, a signal processing module and a power amplifier module. Inputted radio frequency signals are processed by the low noise amplifier module, the signal processing module and the signal conversion module and are then amplified and outputted by the power amplifier module. The signal conversion module is used for carrying out gain control on the signals inputted by the low noise amplifier module, carrying out first conversion processing on the signals after gain control, outputting the signals to the signal processing module, carrying out second conversion processing on the signals outputted by the signal processing module and outputting the signals to thepower amplifier module. The signal processing module is used for controlling the signal conversion module for gain control and carrying out gain compensation processing on the signals after first conversion processing. The invention also provides a method of suppressing strong interference signals. According to the device and the method disclosed in the invention, the communication quality of network communication equipment can be improved, the reliability of a communication system is improved, and the effect of expanding the application scenario of the communication system can be achieved.

The invention discloses a multi-channel bandwidth and gain adjustable signal processing system and method, and belongs to the technical field of electronics. The system comprises a low-pass module which is used for the low-pass filtering of a microwave voltage signal; a control module which performs channel gating on a first analog switch chip signal according to an upper computer signal and a '1'or '0' signal transmitted by a voltage comparator, and selects different to-ground resistances of an adjustable gain amplifier; the adjustable gain amplifier which amplifies the microwave voltage signal after gain and bandwidth selection and transmits an output voltage signal to the voltage comparator; and the voltage comparator which is used for judging whether the output voltage signal reachesa reference level or not, outputting the '1' signal to the control module if the output voltage signal reaches the reference level, and outputting the '0' signal if the output voltage signal does notreach the reference level. According to the present invention, the gain and the bandwidth are independently adjusted, the dynamic range of a microwave receiver is wider, and the signal stability is not influenced.

Embodiments of the present application provide a MU-MIMO data transmission method and base station, which are used to implement pairing scheduling for UEs and improve resource utilization. It includes: the base station obtains the first precoding matrix indication PMI of the first user equipment UE, the first rank RANK of the first UE is 1, the base station obtains the second PMI of the second UE, the second rank RANK of the second UE is 1, The corresponding weight of the first PMI and the corresponding weight of the second PMI constitute the corresponding weight of the third PMI whose RANK is 2. The base station uses the third PMI to communicate with the paired first UE and the second UE respectively through the same time-frequency resource. For data transmission, the pairing gain of the first UE and the second UE is greater than a preset threshold. In this way, the base station first determines that the gain after the pairing of the two UEs is greater than the threshold, thereby ensuring that the pairing of the two UEs can generate a larger system gain, thereby improving the quality of data transmission between the base station and the two UEs.

The invention discloses a method and a device for evaluating the stability of a high-proportion power electronic power system. The method comprises the following steps: acquiring a closed-loop transfer function matrix of the high-proportion power electronic power system, a transfer function matrix of a power electronic power station and an interaction matrix of the high-proportion power electronic power system; calculating a uniformity stability criterion matrix of each station based on the closed-loop transfer function matrix of the high-proportion power electronic power system and the transfer function matrix of the power electronic power station, and determining the safety stability of each power electronic power station based on the uniformity stability criterion matrix; calculating a relative gain matrix of the high-proportion power electronic power system based on the interaction matrix, and determining the interaction degree between power electronic power stations in the power system based on the relative gain matrix; and calculating a regional uniformity stability criterion matrix of the high-proportion power electronic power system based on the closed-loop transfer function matrix of the high-proportion power electronic power system and the transfer function matrix of the power electronic power station, and determining the safety stability of each power electronic power region based on the regional uniformity stability criterion matrix.

In described embodiments, process, voltage, temperature (PVT) compensation in a serializer / deserializer (SerDes) device employs a closed loop adaptation compensation that is incorporated into the SerDes receiver adaptation process. A detection method, where the adapted decision feedback equalizer (DFE) target level (e.g., tap H0) is monitored, employs this DFE target level when implementing a closed loop variable gain amplifier adaptation. The DFE target level in conjunction with the VGA level is used to control the PVT setting to maintain target SerDes data path gain by detecting aPVT corner condition. The detected PVT corner condition is employed to generate a control signal to further adjust the LEQ and DFE data path differential pair gain as required by the PVT condition.

The invention discloses a digital-to-analog converter (DAC for short) gain self-calibration circuit, comprising: a first counter counts the output clock of the crystal oscillator (XTAL for short), and controls the state jump of the DAC gain calibration circuit; the DAC control circuit outputs the DAC The frequency division circuit completes the frequency division of the voltage-controlled oscillator (VCO) output clock; the second counter completes the counting of the frequency division circuit output clock; the first lookup table outputs the preset frequency point corresponding to the DAC gain control word ; The second lookup table outputs the difference between the DAC gain control word at the target frequency point and the center frequency point; the fine-tuning control circuit outputs the DAC gain control word at the target frequency point. The present invention can change the capacitance value of the varactor in the inductor-capacitor oscillator by calibrating the DAC gain, finally change the frequency tuning curve of the VCO, and obtain the target frequency signal, and can also automatically Complete quick calibration of DAC gain for multiple frequency tuning curves.

This application discloses a method and device for reducing quantization noise. After dividing the original digital signal into frames, find the sampling point of the digital signal with the largest amplitude in two consecutive frames of signals, namely, the current frame and the next frame, and calculate the The largest target digital gain that does not cause the maximum amplitude to overflow. The target sampling point with the smallest energy and adjacent energy in the current frame is used as the gain switching point. According to the gain switching position and the number of gain switching steps, the original digital gain at the gain switching point The gain is gradually switched to the target digital gain and the analog gain is adjusted accordingly. Since the present application selects a plurality of target sampling points with the smallest energy as the gain switching point, compared with the prior art, the present application optimizes the selection of the gain switching point more effectively, so that the gain switching point near the The energy is minimized, the switching noise is reduced to the minimum, and then the quantization noise is reduced, and the auditory quality of the signal is improved.

A system for calibrating a payload of a satellite, the payload includes a multichannel transmitter or receiver comprising an antenna, one analogue processing chain per channel and a set of digital integrated circuits, the system comprising a calibration device configured to: acquire for all the channels of the transmitter or of the receiver, a digitized calibration signal, set a reference channel and, for each of the other channels, determine a relative complex gain between the channel and the reference channel, for a plurality of frequencies of the calibration signal, correct the relative complex gain of a relative gain of the antenna of the satellite between the channel and the reference channel, estimate a relative delay, estimate a relative phase difference for the set of frequencies, deliver a correction of the relative gain, phase difference and delay of the channel with respect to the reference channel for a set of frequencies.

The invention discloses a multi-user resonant optical communication system based on frequency division multiple access and a method thereof, the system comprises a base station (1) and a mobile terminal (2), and the mobile terminal comprises transceivers located at different users; the base station comprises a first reflex reflector (11), a first gain medium (12), a first electro-optical modulator (13), a first beam splitter (14), a frequency diversity module (15), a second photoelectric detector (18), a first synchronization device (19) and a plurality of diversity processing devices; the transceiver comprises a second reflex reflector (21), a second gain medium (22), a second beam splitter (23), a third photoelectric detector (24), a coupler (25), a second signal processing board (26), a second synchronization device (27) and a second electro-optical modulator (28). According to the invention, by dividing the gain bandwidth, a plurality of users can communicate with the base station without interference at the same time, and convenience is provided for application of resonant optical communication in a multi-user scene.

The invention discloses a load structure for a radio frequency amplifier. The load structure comprises N parallel type RLC circuits which are sequentially connected in series, the first connecting endof the first parallel type RLC circuit is used as the first connecting end of the load structure, the second connecting end of the Nth parallel type RLC circuit is used as the second connecting end of the load structure, and the second connecting end of the Nth parallel type RLC circuit is connected with a power supply voltage; the Mth parallel RLC circuit device parameter and the (N-M + 1)th parallel RLC circuit device form a first-stage RLC parallel resonance network, the same device parameters in the same-stage RLC parallel resonance network are the same, the load structure has the same-stage RLC parallel resonance network, N is a multiple of 2, and N is greater than M. Compared with the technology of the prior art, the load structure and the radio frequency amplifier formed by the load structure provided by the invention have the advantages that voltage gain can be increased by at least 4.4 dB to 6.3 dB, or bandwidth can be increased by at least 2.5 times and gain flatness can beincreased by at least 2.6 times under the same gain.

The invention provides a 5G communication wireless signal testing method and device, and the method comprises the steps: obtaining a frequency spectrum of a 5G communication signal at a current position, and determining a frequency band of the 5G communication signal based on the frequency spectrum of the 5G communication signal; a corresponding detection system is configured for the frequency band of the 5G communication signal, and the detection system is used for removing other interference signals except the 5G communication signal and performing gain and / or compensation on the 5G communication signal so as to test the gained and / or compensated 5G communication signal. By adopting the setting, the accuracy of detecting the signal intensity value of the current position can be effectively improved.