51results about How to "Improve signal detection performance" patented technology

A method and apparatus of transmitting a reference signal in a wireless communication system is provided. A reference signal sequence is generated by using a pseudo-random sequence. A portion or entirety of the reference signal sequence is mapped to at least one resource block and is transmitted. The pseudo-random sequence is generated by a gold sequence generator which is initialized with initial values obtained by using cell identifier. The reference signal provides low PAPR and high cross correlation characteristic.

A method and apparatus of transmitting a reference signal in a wireless communication system is provided. A reference signal sequence is generated by using a pseudo-random sequence. A portion or entirety of the reference signal sequence is mapped to at least one resource block and is transmitted. The pseudo-random sequence is generated by a gold sequence generator which is initialized with initial values obtained by using cell identifier. The reference signal provides low PAPR and high cross correlation characteristic.

Provided is a device equipped with a transceiver (20) whereby sweep signals subjected to FMCW modulation is transmitted at least twice, an FFT unit (32) whereby at least two rounds of sweep signals received in response to transmission from the transceiver are subjected to fast Fourier transforms, and an MRAV processing unit (35a) whereby beat frequencies corresponding to each of the at least two rounds of sweeps by the transceiver are calculated on the basis of at least two rounds of sweep signals obtained by performing Fourier transforms in the FFT unit, whereby velocities are calculated on the basis of beat frequency differences and time differences that are calculated, and whereby distances are calculated on the basis of velocities and beat frequencies that are calculated, thereby making calculations of distances and velocities of a plurality of targets.

The invention relates to a positioning and marking method for embryonic-period primordial germ cells (PGCs), in particular to a bastard halibut embryonic-period primordial germ cell tracking and positioning method. The bastard halibut embryonic-period primordial germ cell tracking and positioning method includes the steps of fixing collected various periods of embryo samples of the bastard halibuts by a 4% PFA solution; using a PBS (phosphate buffer saline) solution with 50% of deionized formamide to preserve the embryo samples at the temperature of -20 DEG C, and subjecting the fixed and preserved embryo samples to oolemma removing, gradient methanol dewatering and rewatering; after rewatering, washing the various periods of embryo samples with PBS buffering liquid without RNA ( ribonucleic acid) enzyme, pre-hybridizing at the temperature of 62-65 DEG C for 2-4 hours; after hybridization, adding a hybridization solution with bastard halibut RNA probes into the various periods of embryo samples subjected to pre-hybridization for hybridizing overnight at the temperature of 62-65 DEG C; after hybridization, subjecting the various periods of embryo samples to washing, antibody incubation and rewashing, keeping away from light, and developing colors to achieve marking for tracking and positioning of the embryonic-period primordial germ cells of the bastard halibuts. The bastard halibut embryonic-period primordial germ cell tracking and positioning method has the advantages that the problems that yolks and oolemma of the samples hybridized in situ conventionally are difficult to strip and a background color is too deep after color developing detection are solved, and operation steps are simplified.

Provided is a range measurement apparatus and method based on chaotic ultra wideband (UWB) wireless communication. The apparatus includes a chaotic signal generating / modulating unit for generating / modulating chaotic signals and outputting them to a transceiving unit; a transceiver for transceiving radio signals; a detector for detecting the radio signals in forms of voltage signals; a transformer for sampling the analog voltage signals and outputting first digital signals of a predetermined level; a comparator for comparing levels of the analog voltage signals with a threshold value and outputting second digital signals; and a range measurement unit for calculating a leading edge, which is a moment when initial data of a packet payload arrive, by using the binary signals from transformation of the first digital signals based on the threshold and the second digital signals, and performing range measurement based on the leading edge. This research is applied to chaotic UWB wireless communication.

The invention provides an interference elimination method of multi-cell base station cooperation, belonging to the wireless information transmission field. When a user terminal located in the edge of the cell communicates with the target service base station thereof, the terminal causes interference to the base stations of the adjacent cells. In the invention, the service base station terminal is used to detect the user signal, and transmit the information bit to the interfered base station after demodulation and coding; and at the interfered base station terminal, the interference is rebuilt in accordance with the received user information bit flow, and is deleted from the received signal, after that, the information is recovered. Compared to the general base station cooperation method, by the interference elimination method of the invention, the transmission rate requirement between the cooperative base stations is reduced, and the system capacity is improved.

The invention discloses a wireless transmission subsystem for VLF through-the-earth communication, comprising a transmitter and a receiver. The transmitter first adaptively encodes and modulates speech codes and short messages or data to obtain a VLF modulated output signal, and sends the VLF modulated output signal to a flexible transmitting antenna for transmission after power amplification andautomatic tuning. The flexible transmitting antenna is configured to generate and transmit a VLF signal of a predetermined carrier frequency. In the receiver, a highly sensitive receiving antenna anda variable-gain low-noise amplifying unit form a weak signal detecting circuit to receive the VLF signal from the transmitter. The VLF signal is subjected to adaptive interference suppression processing, then is subjected to demodulation and channel error correction decoding, and finally is sent to an external interface through voice decoding and the like. In summary, the wireless transmission subsystem enhances the energy of weak signals, achieves normal communication requirements, improves the stability of through-the-earth communication, and provides a new way for mine disaster communication.

The invention discloses an ultra-short baseline positioning method and device based on a three-dimensional array and electronic equipment, and the method comprises the steps: controlling a transmitting array element to transmit a single-frequency continuous pulse, and enabling the single-frequency continuous pulse to be filled with pulses with different frequencies at different time slots; feedback signals received by the receiving array elements are obtained, and the feedback signals are screened based on the instantaneous frequency variance threshold value to obtain effective signals; and calculating time delay data between the effective signals corresponding to the receiving array elements under the same frequency, and generating target position information based on the time delay data. According to the invention, the feedback pulse signals are received through the three-dimensional array formed by the plurality of cross arrays in different planes, one dimension is added in the vertical direction, the redundancy of array elements is improved, and the positioning precision is further improved.

The invention discloses a signal amplification circuit, a metallic detector formed by the signal amplification circuit and a signal amplification method based on the circuit. The signal amplification circuit comprises a signal generator for generating electromagnetic signals and referential signals, an emission coil for emitting electromagnetic signals, a reception coil for receiving sensed signals, a first amplifier for amplifying output signals of the reception coil, a phase shifter for shifting the phases of the referential signals, an adjustable amplifier for amplifying the referential signals, a phase comparison unit for comparing the output signals of the first amplifier with the output signals of the adjustable amplifier, a subtractor which subtracts the output signals of the adjustable amplifier from the output signals of the first amplifier, a second amplification unit for amplifying the signals output by the subtractor, and a single-chip microcomputer which controls the phase shifter and the adjustable amplifier and receives the output signals of the second amplification unit. The detector formed by the signal amplification circuit has substantially improved detection capability.

The embodiment of the invention discloses a data transmitting method and a base station control system. The data transmitting method comprises the following steps: adjacent base stations with multiple antennas determine data to be transmitted by each antenna and a transmitting mode; and at least one antenna of the adjacent base stations on the same time-frequency resource transmits the same data to a user terminal in the same mode. The technical scheme of the embodiment of the invention solves the problem that different cells adopt transmit diversity or multiplex and have particularly high requirement on power control in the prior art, has low requirement on the power control of each base station and is easy to implement, and moreover, the user terminal obtains multi-path gaining and improves the signal detection performance.

An apparatus for measuring a range based on a chaotic ultra wideband (UWB) wireless communication technology is disclosed. The Apparatus includes a chaotic signal generating / modulating unit, a transceiving unit, a detecting unit, a transform unit, a comparison unit, and a range measurement unit. The transform unit converts the analog voltage signal from the detecting unit into digital signals based on a first sampling period. The comparison unit compares the analog voltage signal from the detecting unit with a predetermined threshold value and to output a comparison signal. The range measurement unit is configured to calculate a time point corresponding to a leading edge, which is a moment when initial data of a packet payload arrive, by using the digital signals based on the threshold value and by using the comparison signal, and to perform a range measurement calculation based on the time point corresponding to the leading edge.

The present invention provides a 5G uplink physical layer channel processing method, device, equipment and product, and relates to the technical field of communications. The method comprises the following steps: removing a cyclic prefix from acquired uplink time domain data, and acquiring a first time domain offset value of the uplink time domain data after removal processing on each preamble symbol; performing first fast Fourier transform on the uplink time domain data subjected to removal processing to obtain first frequency domain data; performing second fast Fourier transform on the corresponding first frequency domain data to obtain time domain data corresponding to the preamble symbol; and performing cyclic shift based on the first time domain data and the first time domain offset value, compensating the first time domain offset value of each preamble symbol, and recovering a correct preamble symbol. According to the invention, the detection time delay of the PRACH channel is reduced, the detection efficiency is improved, and the correctness of PRACH detection is ensured, so that the user perception is improved.

The present invention relates to a log-likelihood ratio calculation method, a transmitting signal detection method, and a receiver. The present invention estimates a channel on the basis of the received signal and rearranges a plurality of layers. Further, at the time of rearrangement of the layers, a symbol of a layer having the lowest reliability is considered for every constellation dot, and the successive interference for the remaining layers is removed corresponding to the constellation dots of the layer having the lowest reliability to set the transmitting symbol candidate vector. Furthermore, a log-likelihood ratio for every bit of the plurality of layers is calculated using the transmitting symbol candidate vector to decode the channel.

A method and device for frequency deviation pre -correction are provided. The method includes: estimating an uplink frequency deviation value of a terminal, and obtaining a historic value of the uplink frequency deviation pre -correction that has been used for the frequency deviation pre -correction of the terminal; according to the historic value of the uplink frequency deviation pre-correction, determining a current value of the uplink frequency deviation pre-correction of the terminal, the current value of the uplink frequency deviation pre-correction being closer to the uplink frequency deviation value than the historic value of the uplink frequency deviation pre-correction; by using the current value of the uplink frequency deviation pre-correction, pre -correcting the frequency deviation of the terminal, thereby the signal detection performance of the terminal can be effectively improved.

The embodiment of the invention discloses a transmission method of signals for sequence modulation, comprising the following steps: whether user equipment (UE) belongs to a first group of UE or a second group of UE is determined by UE according to first control information sent by a base station or own characteristics of the UE, wherein the sequence set jumping rule corresponding to the first group of UE is different from that corresponding to the second group of UE; sequence jumping parameters are acquired; signals for sequence modulation are generated according to the sequence jumping parameters and the sequence set jumping rules corresponding to the UE groups of the UE; and the signals for sequence modulation are sent to the base station. As the first group of UE and the second group of UE use different sequence set jumping rules to generate the signals for sequence modulation and send the signals to the base station, the intercell interference can be randomized, and the signal detection performance of the base station is improved.