8 results about "Diversity combining" patented technology

The invention discloses a subcarrier-level diversity combining method and subcarrier-level diversity combining equipment for multi-frequency diversity, and relates to the technical field of wireless communication. The method comprises the following steps: receiving a plurality of frequency points bearing the same service, and respectively carrying out orthogonal frequency division multiplexing demodulation on each frequency point to obtain a symbol estimation value; calculating a soft decision log-likelihood ratio and a reliability vector according to the symbol estimation value; aligning the time deviation, the carrier frequency deviation and the sampling rate deviation generated by frequency crossing of each frequency point based on each symbol estimation value; performing decorrelation processing on the aligned soft decision log-likelihood ratio to obtain a decorrelated soft decision log-likelihood ratio, and performing merging operation on the decorrelated soft decision log-likelihood ratio according to the aligned reliability vector to obtain a merged soft decision log-likelihood ratio; and decoding the merged soft decision log-likelihood ratio to obtain a decoding result, and adjusting the merging operation according to the decoding result. By implementing the technical scheme provided by the invention, the diversity combining accuracy can be improved.

The application provides a radio interference source automatic positioning and troubleshooting system and method thereof, the radio interference source automatic positioning and troubleshooting system comprises a front-end hardware enhancement module, a core algorithm optimization module and a system-level cooperative positioning module, the radio interference source automatic positioning and troubleshooting method comprises hardware deployment and preprocessing, spatial domain beamforming and subarray combination, digital domain multipath elimination and signal recovery and the like, the radio interference source automatic positioning and troubleshooting system and method thereof provided by the application effectively solve the problem that the traditional equipment cannot distinguish the direct wave from the reflected wave, so that the direction finding result is seriously deviated or even points to the wrong direction, and greatly improve the accuracy and reliability of the direct wave identification of the signal.

This invention relates to the field of power line carrier communication technology, and discloses an HPLC signal decoding method, apparatus, and communication device based on a dual-mode system. The method includes: acquiring a frame signal composed of multiple physical blocks; determining multiple log-likelihood ratios corresponding to each copy of data in the target physical block; performing set-and-sort processing on the log-likelihood ratios corresponding to each bit in the multiple copy data based on a first buffer module to obtain the target log-likelihood ratio for each bit in the target physical block, wherein the multiple buffer modules include a first buffer module with a first bit width and at least one second buffer module with a second bit width, the first bit width being greater than the second bit width; storing the target log-likelihood ratio in the target buffer module; and if the target buffer module is one of at least one second buffer module, then performing decoding processing on the target physical block based on the target buffer module. This invention can reduce the area occupied by the buffer module, reduce power consumption, and reduce design complexity.

The application discloses a diversity combining method, device, equipment and storage medium, and the method comprises the following steps: acquiring signal data of multiple signals; the signal data comprises the amplitude of each signal and noise, and the signal data is sent to a receiving module after the source signal is sequentially scrambled, encoded, interleaved, modulated and diversity processed by a sending module; each signal comprises multiple frequency points; the interference filtering threshold of each signal is calculated according to the amplitude of each signal and noise, and the frequency point amplitude of all frequency points in each signal is calculated; based on the frequency point amplitude and the interference filtering threshold of all frequency points, the frequency points not disturbed are combined to obtain a combination result. According to the scheme, the receiving module can filter out the interference information of multiple disturbed different signal data of the message by using the frequency point selection combining method, so as to restore the transmission message, thereby obtaining the diversity gain with small complexity, improving the sensitivity of signal receiving, and making the acquired signal more accurate.

The invention relates to the technical field of power line carrier communication, and discloses an HPLC signal decoding method and device based on a dual-mode system and communication equipment, and the method comprises the steps: obtaining a frame signal composed of a plurality of physical blocks; determining a plurality of log-likelihood ratios corresponding to each copy data in the target physical block; on the basis of a first cache module, diversity combining processing is carried out on the log-likelihood ratio corresponding to each bit in the multiple pieces of copy data, the target log-likelihood ratio of each bit in the target physical block is obtained, and the multiple cache modules comprise the first cache module with the first bit width and at least one second cache module with the second bit width; the first bit width is greater than the second bit width; storing the target log-likelihood ratio in a target cache module; and if the target cache module is one of the at least one second cache module, decoding the target physical block based on the target cache module. According to the invention, the area occupied by the cache module can be reduced, the power consumption is reduced, and the design complexity is reduced.

The application discloses a power special network communication system and a signal processing method based on FFH / SCMA. The system combines fast frequency hopping (FFH) and sparse code division multiple access (SCMA), and a sending end maps user symbols onto multiple SCMA subcarriers through fast frequency hopping to form a fast frequency hopping SCMA code word; a receiving end recovers data through frequency hopping, decoding, sub-set combining and maximum likelihood estimation. The signal processing procedure comprises SCMA encoding mapping, frequency hopping, decoding according to frequency hopping pulses, and multi-copy sub-set combining. Compared with the defect that the conventional SCMA fixed subcarrier transmission is vulnerable to electromagnetic interference, the application significantly improves reliability through frequency sub-set combining, and meets the high-reliability communication access requirement of a new power distribution system.

A ground station processes downlink signals received from respective satellites. The ground station has a plurality of signal conditioning devices each receiving a respective one of the downlink signals and providing a conditioned downlink signal. A plurality of Doppler and / or Delay compensator devices each receive a respective conditioned downlink signal from a respective one of the plurality of signal conditioning devices. The compensator devices conduct Doppler and / or Delay compensation on the received conditioned downlink signal, and provide a compensated downlink signal output. A selector or diversity combiner receives the compensated downlink signal from each of the plurality of Doppler and / or Delay compensators. The selector or diversity combiner selects one of the received compensated downlink signals based on received signal strength of each received compensated downlink signal to provide a selected downlink signal, or diversity combines all of the received compensated downlink signals to provide a diversity combined signal. The selector or diversity combiner provides the selected downlink signal or the diversity combined signal to an eNodeB.

This invention relates to a BeiDou and mobile communication fusion positioning system based on frequency division mixing (FDM), belonging to the field of BeiDou positioning and mobile communication fusion technology. The system includes a BeiDou multi-channel signal generation unit, a signal combining unit, a mobile communication transmission unit, and a BeiDou signal conversion unit, with each unit operating sequentially. The BeiDou multi-channel signal generation unit generates BeiDou frequency domain diversity combined signals or BeiDou time-division frequency domain diversity signals based on the frequency division isolation principle. The signal combining unit preprocesses and combines or directly transmits the signals. The mobile communication transmission unit enables the shared network transmission of BeiDou signals and mobile communication signals. The BeiDou signal conversion unit generates BeiDou positioning signals through filtering, mixing, and other processing. This invention relies on the core technology of frequency division mixing to enable BeiDou signals to share the transmission network with existing indoor communication distribution systems, adapting to enclosed scenarios such as parking lots, utility tunnels, and underground tunnels. It features a simple structure, strong coordination, and allows for seamless terminal access for positioning and navigation.