36results about How to "Achieving Interference Suppression" patented technology

The invention discloses an optimized weighted CSI feeding back method for cooperative beam forming, which comprises that: in a cooperative beam forming mode, a terminal (UE) estimates the state information of a channel from a service cell to the terminal by using a channel state indication reference signal (CSI-RS); the UE estimates the state information of an equivalent channel from main interfering neighboring cell to the UE by using a demodulation reference signal (DMRS); and the UE calculates a weighted CSI by using the state information of the channel from the service cell to the UE and the state information of the equivalent channel from the main interfering neighboring cell to the UE and feeds the weighted CSI to the service cell. The invention also provides an optimized weighted CSI feeding back device for cooperative beam forming. With the method and the device, channel information interaction between the service cell and the main interfering neighboring cell is not required in the feedback of the weighted CSI.

The invention discloses a method and device for transmitting bandwidth information, which are used for transmitting bandwidth information in a CoMP system. The method comprises the steps: a base station determines a transmission bandwidth based on the condition that UE is needed to obtain downlink data or reference signals of the bandwidth information in a plurality of cells; the base station sends the determined indication information of the transmission bandwidth corresponding to the corresponding downlink data or reference signals to the UE; and the base station determines physical resources required to be occupied by the reference signals and sequences of the reference signals according to the transmission bandwidth determined aiming at the reference signals, transmits the sequences of the reference signals on the physical resources, or the base station determines physical resources occupied by the downlink data according to the transmission bandwidth determined aiming at the downlink data, sends indication information of the physical resources to the UE and then transmits the downlink data on the physical resources.

The invention discloses a complex moving target ISAR imaging method based on a quasi-time-frequency bilinear coherence algorithm, and the method comprises the following steps: obtaining the echo dataof a target, and carrying out the distance compression and translation compensation of an echo signal; extracting data from the signal along the distance direction, and calculating an improved cubic phase function MCPF of an extraction result; performing Radon-CPF-Fourier transform on the MCPF, and obtaining a three-dimensional data matrix in a Doppler center-polar radius-polar angle domain; and projecting the three-dimensional data matrix to a Doppler central axis along a polar radius and a polar angle, and generating a final high-resolution inverse synthetic aperture radar (ISAR) image by recombining all distance-Doppler centers. According to the method, the cross term interference suppression of a cubic phase function can be realized under the condition of no time-frequency resolution loss, the signal gain is improved, the calculation performance is improved, and a clear maneuvering target ISAR image is obtained.

The invention provides a polarization discrimination method for active false targets in a main lobe suppressing interference background. The polarization discrimination method comprises the steps of: receiving signals by using an H polarization channel and a V polarization channel of a radar, carrying out matched filtering according to sub-pulse waveforms at first after synchronous sampling, carrying out interference polarization estimation and polarization cancellation on the two paths of output signals, processing one path of output signal by adopting an M point sliding window method to realize non-coherent accumulation and further adopting a CFAR method to realize target detection, extracting target features of a detected sampling position, and carrying out discrimination of real and false target attributes by utilizing the features. According to the polarization discrimination method, the radar adopts a transmission variable polarization method, and can perform active false target discrimination through extracting signal amplitude variation features.

The invention discloses a method, a terminal and a base station for uplink interference cancellation. The terminal receives precoding information from a service base station, the precoding information is adjusted according to channel state information from the terminal to a collaborative base station, and data are sent to the service base station according to an obtained adjusted precoding matrix. The service base station or the collaborative base station adjusts the precoding information used by the terminal according to the channel state information from the terminal to the collaborative base station to obtain adjusted precoding matrix information, the service base station or the collaborative base station sends the adjusted precoding matrix information to the terminal, and the terminal sends data to the service base station according to the adjusted precoding matrix. The service base station or the collaborative base station adjusts the precoding information used by the terminal according to the channel state information from the terminal to the collaborative base station to obtain the adjusted matrix information, the service base station or the collaborative base station sends an adjusted matrix and the precoding information used by the terminal to the terminal, and the terminal adjusts the used precoding information to obtain an adjusted precoding matrix according to the adjusted matrix and sends data to the service base station according to the adjusted precoding matrix. The method, the terminal and the base station for the uplink interference cancellation can achieve interference suppression at a sending end.

The invention provides a sensor-detection-based camera flicker elimination method and device. The method comprises: S1, carrying out ambient light signal sampling; S2, outputting original image data;S3, extracting the ambient light sampling signal; S4, determining an ambient light scintillation frequency; S5, updating a frame rate of a camera; and S6, updating an exposure frequency of the sampling row of the ambient light signal according to the frame rate of the camera and returning to the step of ambient light signal sampling. Therefore, the interference of light with different scintillation frequencies and interference of light with superposed scintillation frequencies can be suppressed; the video image is kept to be stable; and the image quality is improved.

The invention provides a wide beam interference suppression method for weak target detection, which comprises the following steps: step 1) receiving a broadband signal of a long-distance target by a space linear array, and performing fast Fourier transform on the signal received by each array element of the linear array in a time domain to generate a time domain frequency spectrum of each array element signal of the linear array; dividing the space linear array into a plurality of overlapped sub-arrays; performing phase compensation on the signal time domain spectrum of the overlapped subarrays to form beam domain output and obtain a subarray azimuth spectrogram; 2) utilizing a sub-array azimuth spectrogram, determining an interference orientation, performing interference suppression weighting on the beam domain output, correcting the interference suppression weighting by using the expected null width to obtain null weighting, and controlling the interference suppression width of the beam domain output to obtain an orientation spectrogram after interference suppression, thereby realizing suppression of strong interference and detection of a weak target under a strong interference background. According to the invention, a strong interference signal of a wide beam is effectively suppressed, the detection performance of a weak target is improved, and the output signal-to-interference ratio is improved; sea test data proof validity.

The invention relates to an OPPM-UWB (overlapping pulse position modulation-ultra wide band) communication method on the basis of a time reversal technology and belongs to the technical field of wireless communication. In the technical scheme, the OPPM-UWB communication method comprises the following steps that: in the step 1, firstly a receiving end determines a modulating pulse x(t) with the corresponding pulse width according a transmission rate of OPPM-UMB wireless communication and sends the modulating pulse x(t), and then a sending end carries out time reversal operation on a receiving signal y(t) to obtain a reversal signal s(t); in the step 2, the sending end carries out OPPM modulation on information which needs to be sent by using the reversal signal s(t) as a modulating pulse for inhibiting multipath interference and sends the information; and in the step 3, the receiving end receives an OPPM modulating signal, then carries out modulation and decoding on the received signal and reduces the sent information. In the OPPM-UWB communication method, the time reversal technology is introduced in the OPPM modulation; and the intersymbol interference caused by multipath delay can be reduced by utilizing the self-adaptive focusing characteristic of the time reversal signal, so that the bit error rate of a system is reduced. Due to the adoption of the OPPM-UWB communication method, the interference inhibition of a multipath channel can be realized without improving the complexity of a receiver or carrying out complex signal processing.

The invention provides a wireless communication receiver, an interference elimination method and device thereof and a signal demodulation method. The wireless communication receiver at least comprises two receiving antennas. The interference elimination method comprises the following steps: carrying out channel estimation on an interference cell based on received signals; calculating correlation of interference cell emission signals on each receiving antenna through the channel estimation result of the interference cell; and carrying out interference elimination operation on signals received by the receiving antennas according to the correlation of interference cell emission signals on each receiving antenna. According to the technical scheme, the interference elimination is performed on the received signals through the wireless communication receiver under the condition of not increasing too much operation; the wireless communication receiver is allowed to have a certain interference inhibition capability; and thus the reception performance is improved under the condition of same frequency interference.

In a wireless base station (100), a first transmission rate is calculated for transmission to a wireless terminal at channel quality at a first transmission power in a first candidate bandwidth selected as a candidate from a first wireless bandwidth containing a neighbor priority bandwidth, and a second transmission rate is calculated for transmission to the wireless terminal (200) at channel quality at a second transmission power in a second candidate bandwidth selected as a candidate from a second wireless bandwidth not containing the neighbor priority bandwidth. A first wireless resource has the first transmission power and the first candidate bandwidth, and a second wireless resource has the second transmission power and the second candidate bandwidth; of these, the wireless resource with the higher calculated transmission rate is set as the wireless resource which can be allocated to the wireless terminal (200). By this means, throughput of the wireless terminals in the communication area of the local base station can be maximized while suppressing interference to neighboring cells.

The invention discloses a far-end unit packet control scheduler in a distributed indoor distribution 5G system and a scheduling coverage method. The control scheduler comprises a packet pilot frequency sending module, a pilot frequency measurement report processing module, a user packet management module and a scheduling module. The scheduling coverage method comprises the following steps: 1, grouping all far-end units in the 5G distributed system; 2, the central unit controls to send pilot signals specific to each far-end unit group on different far-end unit groups; 3, receiving a measurementreport of the user equipment for each pilot signal; 4, specifying a far-end unit group serving the user terminal; 5, allocating wireless resources to the user equipment according to the unit groups serving the user equipment. According to the invention, the problem of bottom noise uplift caused by uplink far-end unit signal combination and the problem of uplink and downlink asymmetry in a traditional 5G indoor distributed system are solved.

The invention discloses a downward-looking multi-beam synthetic aperture imaging sonar zero-degree interference suppression method, and the method comprises the steps: obtaining an echo signal under acylindrical coordinate system according to the working parameters of a downward-looking multi-beam synthetic aperture imaging sonar system and by combining a downward-looking synthetic aperture three-dimensional imaging sonar signal echo model; performing depth-direction pulse compression processing on the echo signal under the cylindrical coordinate system to obtain a depth-direction imaging signal; performing cross-course beam forming processing on the depth-direction imaging signal to obtain a cross-course beam forming signal; carrying out calculating to obtain an echo intensity compensation factor according to sonar bottom distance data measured by a Doppler log in combination with the scattering intensity distribution characteristic of the bottom echo signal; carrying out amplitude compensation on the cross-course beam forming signal through the echo intensity compensation factor to suppress zero-degree interference, and obtaining a suppressed cross-course beam signal; and carrying out along-course synthetic aperture processing on the suppressed cross-course beam signal to obtain an along-course imaging result.

The invention discloses a communication radio frequency server. The communication radio frequency server comprises a main access unit and a sub access unit, wherein the main access unit and the sub access unit are connected with multiple remote units through optical cable. The communication radio frequency server can support the wireless movable signal coverage requirement of multi-service providers and multi-network, single-service provider and single-network, and single-network and multi-service providers. The communication radio frequency server can provide system interfaces with the various network systems such as the Telecom, the Mobile and the Unicom. The communication radio frequency server can independently provide the system interfaces with various network systems such as the Telecom, the Mobile and the Unicom. The index of the interfaces can meet the network system operating requirement and signals with the bandwidth ranging from 650 MHz to 800 MHz can be processed. The interfaces are reserved for a cluster system of public security and fire protection. The communication radio frequency server has the advantages of being small, space saving, powerful in performance, environment-friendly and energy-saving, convenient to upgrade a network and rapid in networking.

The invention discloses a canonical correlation separation main lobe interference suppression-based method. The method comprises the steps of obtaining a radar echo signal; carrying out first canonical correlation separation on the echo signal by taking a radar transmitting signal as a reference; performing pulse pressure processing on the result of the first canonical correlation separation to obtain a first pulse pressure result; performing second canonical correlation separation on the echo signal according to the first pulse pressure result; and performing pulse pressure processing on a result of the second canonical correlation separation to obtain a target position. According to the method, good correlation between the echo signal and the known emission signal is utilized, a good separation effect is achieved on the target signal and the interference signal in the echo signal through a two-time canonical correlation separation method, and therefore the anti-interference characteristic is improved, and the method is small in calculation amount, low in system complexity and low in implementation cost.

The invention provides an co-location interference suppression method based on optical processing. According to the method, the problem of radio frequency co-location interference is processed on a photonic link, and the suppression of the co-location interference is realized by utilizing the special transmission characteristics of the MZM-based photonic link. The photon link signal output power based on the MZM is firstly increased and then decreased along with the increase of the radio frequency signal input power, and finally the phenomenon that zero points and peak values are periodicallyalternated occurs. By controlling the input power of the interference signal, the output power of the interference signal is enabled to be at a zero point, same-address interference suppression is realized, and the suppression ratio reaches 78dB. Meanwhile, corresponding suppression conditions can be obtained through calculation according to the input of radio frequency signals with different frequencies, so that the same-address interference suppression in a broadband range can be realized.

The invention relates to a GNSS cascade adaptive multi-beam forming method and belongs to the field of satellite navigation. The method comprises two parts of whitening processing and beam forming, the whitening processing completes antenna end interference suppression, the beam forming completes receiver end beam forming, and the whitening processing comprises autocorrelation matrix calculation, autocorrelation matrix square root calculation, square root inversion operation and data conversion processing; the beam weighting comprises weight transformation processing and beam weighting. Compared with a traditional GNSS beam forming method, the scheme can separate anti-interference processing from beam weighting, so the anti-interference processing of an antenna end does not need to be assisted by prior information such as satellite direction and antenna attitude, and a receiver end is easy to achieve space, time and frequency three-dimensional integrated searching and tracking; and meanwhile, the autocorrelation matrix square root inversion algorithm adopted by the scheme is beneficial to improving the odd interference suppression degree of the autocorrelation matrix and improving anti-interference stability of the system.