63results about How to "Improve reception accuracy" patented technology

Each of a general chunk to which pilot signals are allocated at a general density, and a high-density chunk to which pilot signals are allocated at a higher density than the density of the general chunk, is transmitted in a frequency band common to OFDM transmitters. Each of the OFDM transmitters allocates the high-density chunk to any one of OFDM receivers, which notifies poor receiving quality.

A radio receiver with improved accuracy of phase-locked loop is disclosed. In addition to a detector for detecting a detected signal from a received radio signal, the receiver includes a monitor for monitoring an amplitude change of the detected signal to detect timing where the amplitude change occurs over a predetermined range. The phase-locked control of the timing clock signal with respect to the detected signal is performed only when the timing is detected by the monitor.

The invention discloses a timing synchronization hardware implementation method applicable to an OFDM system. An IEEE 802.11a/g/n protocol is compatible, cyclic shift of the IEEE 802.11n protocol is correspondingly processed, and synchronous data are more accurate. A robust frame detecting algorithm is designed, whether data come truly is judged by means of cluster peak detection and instantaneous peak detection, judgment accuracy is improved, two self-correlation modules and a moving average module are used for coarse frequency offset estimation and fine frequency offset estimation respectively, final frequency offset is obtained comprehensively according to the relation between coarse frequency offset estimation and fine frequency offset estimation, frequency offset estimation accuracy is improved, an improved CORDIC algorithm is adopted for frequency offset correction, and operating efficiency is improved.

The present invention provides a solution to determine a real-time location of an object in an indoor facility utilizing the spatial and angular antenna diversity on a sensor. Specifically, the spatial diversity is achieved by placing a second antenna a predetermined distance (which is greater than one-half of the wavelength) away from the first antenna. The angular diversity is obtained by placing the second antenna at ninety degrees (perpendicular) angle of the first antenna.

A receiver that uses multiple antennas to receive signals arriving over multiple paths and is configured for enhanced received signal path detection accuracy and improved reception quality includes a receive weight generating circuit that generates receive weights for every antenna based on signals received from the antennas, a summing circuit that calculates sums of results obtained by multiplying the signals from the antennas and the receive weights of the individual antennas generated by the receive weight generating circuit and path detection circuit that detects the paths of the received signals based on the sums calculated by the summing circuit.

The method includes (1) setting up threshold value of engaged sending window, and monitoring size of the sending window and data to be sent in real time; (2) determining whether size of the sending window is less than threshold value of engaged sending window; if no, selecting unconfirmed data from size of the sending window to send, ending; if yes, then executing step (3); (3) determining whether size of the sending window is smaller than size of data to be sent; if no, selecting unconfirmed data from data to be sent to carrying out sending; if, yes, returning back to (1). The invention solves waste of bandwidth under operation of window mechanism. When data is full in the sending window or data are less, the method carries out sending selectively forwardly in order to raise sending efficiency at sending end in data transmission procedure. Moreover, using retransmission increases correction rate of reception at receiving end so as to lower time delay from end to end effectively.

The invention relates to a method and device for transferring signal data from a sender to one or more receivers. The invention includes receiving a quantity as a function of time, arranging the quantity into a first polynomial to obtain values for polynomial coefficients of a first continuous signal, and transferring the values of the polynomial coefficients of the first continuous signal via a first data transfer link to one or more receivers.

The invention belongs to the field of terminal equipment, and provides a receiver IQ imbalance compensation method and device. The method comprises the steps: calculating a pre-calibration parameter and carrying out the pre-calibration when a receiver is subjected to factory calibration, so as to compensate the initial IQ imbalance; and when the receiver is in a use state, performing fine calibration based on the pre-calibration parameter and the fine calibration parameter to compensate the current IQ imbalance. The IQ imbalance compensation of the receiver is carried out in a mode of combining pre-calibration compensation and fine calibration compensation, the accuracy of compensation is ensured under the condition that the receiving precision is improved, and resources are saved at the same time.

The embodiment of the application provides an infrared remote control signal receiving method, an infrared remote control signal receiving system, infrared remote control signal receiving equipment and a storage medium. The method comprises the steps: receiving an infrared pulse through a first thread, and sequentially storing the pulse duration data of the infrared pulse into a first data sequence; acquiring one-bit pulse duration data stored in the first data sequence through a second thread; judging whether the time interval between the pulse duration data and the previous pulse duration data is overtime or not; if not, storing the pulse duration data in a second data sequence, and performing infrared remote control decoding on the pulse duration data stored in the second data sequence;and if the second data sequence is overtime, emptying the second data sequence, and continuing to acquire next pulse duration data stored in the first data sequence. According to the embodiment of the application, when the infrared remote control signal is received, the loss of new pulse data due to untimely receiving caused by overlong decoding processing time can be prevented, and the accuracyof receiving and decoding the infrared remote control signal is improved.

The invention discloses a road side unit and a free flow electronic charging system. The road side unit is provided with at least two receivers, and carriers of the at least two receivers in multiple receivers are different. The free flow electronic charging system also comprises a multi-lane system controller and single-lane controllers which are distributed on different lanes besides the road side units, wherein multiple road side units are distributed on different lanes, the road side unit of each lane is respectively connected with the single-lane controller of the lane, and each single-lane controller is connected with the multi-lane system controller. By utilizing the road side unit and the free flow electronic charging system which are disclosed by the invention, the receiving effect of the free flow electronic charging system can be improved, a communication switching problem when a vehicle changes the lane can be effectively solved, and the normal operation of communication service can be guaranteed.

In a CATV trunk amplifier, a downward signal input to an input terminal from the center equipment side is input to a downward amplifying circuit via a first filter and a second filter. The amplified downward signal is output to the terminal device side via the second filter, the first filter, and an output terminal. An upward L signal is input from the terminal device side via the output terminal to an upward L amplifying circuit via the first filter and a third filter. The amplified upward L signal is output to the center equipment side via the third filter, the first filter, and the input terminal. An upward H signal is input to an upward H amplifying circuit via a fourth filter. The amplified upward H signal is output to the center equipment side via the fourth filter and the input terminal.

The invention discloses a synchronization method among distributed network nodes in an acoustic communication mode and belongs to the field of underwater acoustic communication. According to the method, acoustic propagation delay among fixed nodes is obtained through utilization of an acoustic communication process among the fixed nodes of a network; a clock of a master node in the network is taken as reference; a synchronization signal of the master node is taken as an alignment signal; time difference information from current signal transmitting time to positioning signal transmitting time is carried in the synchronization signal; and after sub-nodes receive the synchronization signal, time information in the synchronization signal is demodulated, the propagation delay between the masternode and the sub-nodes is subtracted by the time, and the time of transmitting positioning signals by the sub-nodes can be obtained, so the purpose of synchronously transmitting the positioning signals in the whole network is achieved. The method is characterized by that real-time high-precision synchronization of the whole system is realized in a positioning process, power consumption is low, and cost is low.

The invention discloses a method and a device for improving the data receiving correctness of a serial port, and belongs to the field of data transmission. The method comprises the following steps: S101: entering a UART (Universal Asynchronous Receiver and Transmitter) interrupt processing function; S102: reading a UART cache, and saving received data in an internal memory; S103: clearing UART interruption marks; and S104, detecting UART interruption marks, and carrying out S102 when one or more UART interruption marks is/are detected. Compared with the prior art, the method has the advantages that the work load of a microcontroller is reduced; adverse impact on current operation of the microcontroller is avoided; software running speed and efficiency are improved; the correctness of received data is improved; and system power consumption is reduced.

Embodiments of the invention provide a Manchester code sampling processing method and module, and a Manchester code decoder which belong to the technical field of communication. The method includes the following steps: N time sampling is performed on a current half code element of a Manchester code at first clock frequency to obtain N sampling values of the current half code element, wherein the first clock frequency is N*2 times of transmission clock frequency of the Manchester code, N>1; and if more than half of the sampling values of the N sampling values are identical, it is determined that an effective value of the current half code element is the identical value. According to the method, multiple sampling processing is performed on the current half code element of the Manchester codeat the first clock frequency that is 2N times of the transmission clock frequency of the Manchester code to obtain the effective value with greater possibility of the current half code element, thereby effectively improving the reception correct rate of the Manchester code at a decoding terminal, and so, the decoding correct rate of the Manchester code at the decoding terminal is correspondinglyincreased.

The invention discloses an anti-interference device for computer communication equipment, and relates to the technical field of computer communication. The device comprises a box body, a signal processor and communication equipment, a box door is arranged at the front end of the box body; a handle is arranged at the right part of the box door; fixing pieces are arranged at the four corners of therear end of the box. An air inlet net is arranged on the upper portion of the left side wall of the box, an air outlet net is arranged on the lower portion of the right side wall of the box, a fan isarranged on the right portion of the lower side in the box, an antenna is arranged on the upper portion of the right side wall of the box, a first fixing frame is arranged on the upper portion in thebox, and a communication device is arranged at the upper end of the second fixing frame. According to the invention, the box body adopts a copper wire layer and iron wire layer anti-interference structure, and the positive and negative charge generator can form a shielding magnetic field, thereby facilitating the improvement of the anti-interference performance. Through the filtering of the filterand the further optimization of the signal processor, the signal receiving precision and the signal quality can be improved.