15 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 invention discloses a design method for controlling interaction of a plurality of radio stations under short-wave networking, which comprises the following steps of: in a starting stage, acquiring radio station fixed parameters of all network control console sides; sending an application subscription protocol to all radio stations on the network console side; sending all successfully planned short-wave frequency sets to the successfully subscribed radio stations, and pre-tuning the frequency sets by the radio stations; sending other parameter configurations of the radio station to the radio station which is successfully pre-tuned, and sending a setting result after the radio station is successfully set; after a task execution command is sent out, service switching is carried out; selecting a proper transmitting radio station group; a transmitting frequency point of each transmitting point is selected through an ionosphere propagation prediction model frequency selection algorithm, and the frequency and the bandwidth of the current service are modified at the corresponding radio station; state reports of the selected radio station groups are compared, and the same service content information is uniformly sent to the ready radio stations within a certain time; according to the scheme, the wireless transmission efficiency under networking is improved, and the diversity combining effectiveness is improved.

The invention provides a diversity signal phase deviation compensation method and system based on pilot frequency and data combination, and relates to the field of digital communication, and the method comprises the steps: calculating a difference value between two paths of diversity signal sequences received at a target symbol position through a receiving signal sequence model, and carrying out the average noise reduction of a difference result between all data symbols; estimating a phase offset result between two paths of diversity signals based on pilot frequency coherent noise reduction and a data diversity inter-symbol difference post-averaging algorithm, and calculating to obtain a parameter estimation linear signal-to-noise ratio; and carrying out noise reduction on a phase offset result estimated by an average algorithm after pilot frequency coherent noise reduction and data diversity inter-symbol difference by adopting a maximum ratio diversity to obtain an improved linear signal-to-noise ratio of phase offset parameter estimation. On the premise of not increasing pilot frequency overhead, the phase offset estimation precision can be obviously improved, finally, the decoding performance is obviously improved, the practical equipment performance competitiveness is improved, and meanwhile, the pilot frequency overhead can be reduced in waveform design by adopting the technology, so that the equipment performance is 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 invention provides a space-time WALSH coding method and device under an MIMO channel, and relates to the technical field of communication. According to the technical scheme provided by the invention, the cross-correlation function between the pilot frequency and the local pre-stored sequence is calculated for each transmission path between each transmitting antenna and the corresponding receiving antenna, scalar superposition is carried out on the cross-correlation function of each transmission path to obtain the composite correlation function, and the maximum power point is searched according to the correlation peak of the composite correlation function. And the phase deviation and the frequency deviation are calculated according to the phase deviation and the frequency deviation, so that the mismatching problem of each transmission path in an MIMO (Multiple Input Multiple Output) channel is effectively compensated. The space diversity gain provided by the MIMO channel is fully utilized through maximum ratio combination, and the signal-to-noise ratio of the combined signal is improved. According to the scheme, WALSH code spread spectrum, joint channel estimation, space diversity combining and other technologies are comprehensively utilized, and transmission of control information can be accurately and effectively achieved under an MIMO channel.

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 application relates to the technical field of signal combination, and particularly discloses a signal combination method and system based on mixer phase shift adjustment, which comprises the following steps: at least two radio frequency front end links are arranged to simultaneously receive signals, and at least two received signals are combined before an analog-to-digital converter to obtain a mixed signal; the mixed signal is subjected to analog-to-digital conversion, and phase estimation is performed on the mixed signal in a digital domain; and the phase estimation result is fed back to a mixer of at least one radio frequency front end link, so that the phase shift of the mixer of the at least one radio frequency front end link is controlled, and the phase shift operation required by signal combination is realized while the signal is down-converted in the link. The application designs a signal combination method based on mixer phase shift adjustment, adjusts the phases of different signals, optimizes the combination of the signals, improves the overall quality of the received signals, and further improves the reliability of signal transmission.

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.

The invention discloses a positioning performance evaluation method. The method comprises the following steps: firstly, calculating a carrier-to-noise ratio of a single positioning antenna, a carrier-to-noise ratio after diversity and diversity benefits; then, calculating the satellite number density according to the current positioning demand; then, combining satellite number density and diversity benefits, comprehensively evaluating antenna positioning performance, and judging whether the antenna positioning performance meets positioning requirements or not; if not, starting a diversity combining strategy to adjust antenna configuration, and performing combining processing on the multi-antenna signals by using a maximum ratio combining diversity strategy, thereby effectively improving the signal quality; and finally, re-executing the evaluation process, and dynamically adjusting the antenna combination strategy according to the evaluation result. According to the method, a plurality of key parameters are comprehensively considered, so that the positioning system can meet high-precision and high-reliability positioning requirements in different application scenes.

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.

A cellular base station comprises a cellular radio having first and second radio ports, the cellular radio configured to perform diversity combining using a first diversity combining technique on first and second received uplink signals that are passed to the cellular radio through the first and second radio ports; and a diversity combining circuit that is configured to select the first and second received uplink signals from a larger group of received uplink signals and to pass the selected first and second received uplink signals to the cellular radio through the first and second radio ports.

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.