514 results about "Data demodulation" patented technology

In a system having a plurality of cells participating in a Coordinated Multi-Point (CoMP) operation, a method for transmitting Reference Signals (RSs) to User Equipment (UE) includes generating, by Base Station (BS) included in each of the plurality of cells, a subframe including RSs for a UE located in the each of the plurality of cells, and transmitting the generated subframe to the UE by the BS. The RSs include RSs for channel measurement, and RSs for data demodulation, the plurality of cells are grouped according to frequency shift values applied to the RSs for channel measurement and RS allocation patterns are determined for two cells among the plurality of cells according to a predetermined rule.

Provided are a receiver, a transmitter and a radio communication method capable of using non-orthogonal multiple access while suppressing cost increase and processing delay. A mobile station 200A includes a physical channel segmentation unit 210 and data demodulating/decoding units 220. A radio resource block allocated to non-orthogonal signals is defined in a frequency domain, a time domain and a non-orthogonal multiplex domain. The non-orthogonal multiplex domain has multiple levels corresponding to the number of interference cancellations by the data demodulating/decoding units 220. Interference canceller of the mobile station 200A cancels a non-orthogonal signal whose allocated radio resource block is at a lower level than that of the mobile station 200A.

Systems and methods are provided for determining and applying timing corrections in a digital communications system. In an aspect, a timing correction method is provided for a multi-carrier system. This includes aligning two or more symbols with respect to each other from a symbol subset in order to account for timing differences between the symbols. The symbol alignment is first carried out to generate channel estimates for data demodulation. The channel estimates, thus generated, along with the timing alignment information are in turn used for determining timing corrections to be applied to future symbols.

The invention provides a master-slave mode DC carrier communication system; wherein, a master machine comprises the clock circuit of the master machine, the power system of the master machine, the communication interface of the master machine and the control module of the master machine; a slave machine comprises the communication interface of the slave machine, a rectifier bridge circuit, an energy storage module, the power system of the slave machine, the clock circuit of the slave machine and the control module of the slave machine. The master machine can be the initiation device of an electronic detonator; the slave machine can be the electronic detonator. A unipolarity communication interface consisting of a unipolarity data modulating module and a unipolarity data demodulating module or a bipolar communication interface consisting of a bipolar date modulating module and a bipolar data demodulating module can be selected as the communication interface of the master machine; the communication interface of the slave machine can comprise the data modulating module and the data demodulating module of the slave machine. The invention also provides a control method for the master machine and the slave machine in the system. The technical scheme realizes the bidirectional data alternation between the master machine and the slave machine when the master machine supplies a working power to the slave machine, thereby improving the maintainability of the system.

This invention discloses a baseband signal processing method for GNSS receivers, particularly for common ranging-code signal for GNSS receiver, completing: the baseband signal catching, the tracking processing within frequency domain, easily for realization in large scale integrated circuit. During the signal catching step, FFT and IFFT calculation method is used for grouped calculation to simplify the time-domain related calculation. During the code-tracking, thus obtained related peak positions are found, then precision est1 mate of code phase is fulfilled by utilizing curve-fitting method. During the carrier tracking, DFT values of these points is calculated by using sliding DFT method, after the DFT point values ranges are determined based on rough carrier frequency estimate, and then proceeding estimate of carrier frequency, data demodulation by using IFFT output result.

An antenna weight estimation method in a mobile communication system is capable of improving the accuracy of antenna weight estimation values, thereby improving communication quality and increasing radio channel capacity. It operates instantaneous estimation and accumulative estimation in parallel, in which the former is made for estimating the antenna weight used for received SNIR estimation for transmission power control, and the latter is made for demodulating the received data. Thus, it can obtain the antenna weight for the received SNIR measurement with a minimum delay, and at the same time, it can improve the reliability of the antenna weight for the data demodulation.

A beamforming system synchronization architecture is proposed to allow a receiving device to synchronize to a transmitting device in time, frequency, and spatial domain in the most challenging situation with very high pathloss. A periodically configured time-frequency resource blocks in which the transmitting device uses the same beamforming weights for its control beam transmission to the receiving device. A pilot signal for each of the control beams is transmitted in each of the periodically configured time-frequency resource blocks. The same synchronization signal can be used for all stages of synchronization including initial coarse synchronization, device and beam identification, and channel estimation for data demodulation.

This invention discloses a guiding project based on time and frequency's synchronized training sequence. It uses the good period correlated characteristic and constant amplitude of CAZAC sequence to serve the CAZAC sequence as the known measuring sequence, and cramps out a part of sequence from CAZAC sequence to serve as guiding signal. Amplifies properly the guiding signal's power, and inserts the digital signal into the relevant place of the guiding signal and sets to zero. The measuring sequence can either be used to synchronize the time and frequency, also can be used to the channel estimation. The invention can make more precise channel estimation, higher data demodulation performance to make the system tracing the fading of the channel more precisely and duly.

A resource scheduling method for an uplink interleaver-division multiple-access system includes: all terminals in a cell transmit frequency-guiding signals and scheduling requests for channel quality measurement to a base station; the base station allows all the terminals to measure frequency domain channel quality thereof; the base station selects terminals that are going to share the same frequency resource in an interleaver-division multiple-access mode from the all terminals and couples the selected terminals; the base station transmits resource distribution information, with which the terminals can transmit data, guide frequency and control channel, to the coupled terminals according to the determined coupling decision; the terminals employ the resource distributed from the base station to transmit guiding frequency and uplink control channel for data demodulation; and the terminals employ the resource distributed from the base station to transmit uplink data. The resource scheduling method for uplink interleaver-division multiple-access system provided in the invention makes a system perform optimized resource distribution according to characteristics of interleaver-division multiple-access, thereby realizing maximization of an uplink system capacity.

A device for fast transition from preamble synchronization of a received baseband signal to demodulation of the received baseband signal may include a baseband chip tracking loop to generate an offset tracking value to track any initial chip phase offset and Doppler-caused baseband chip frequency drift associated with the received baseband signal. The device may also include a numerical controlled oscillator to correct any Doppler-caused phase rotation associated with the received signal. The device may additionally include a preamble synchronization unit to detect a preamble of the received baseband signal, and to measure a chip phase offset and a baseband Doppler frequency shift associated with the received baseband signal. The chip phase offset may be used to set an initial chip phase offset value of the chip tracking loop so that the chip tracking loop starts with approximately a zero pull-in error. The baseband Doppler frequency shift may be used to set initial frequency offset values in the chip tracking loop and the numerical controlled oscillator so that both start with substantially near-zero offset errors for substantially immediate demodulation of the received signal. The device may further include an output device to output the data demodulated from the received baseband signal.

An embodiment of the invention discloses a data processing method and device. The method comprises the following step: a terminal obtains indication information issued by a base station, the indication information is used for indicating information of second time frequency resource, the second time frequency resource is a part, distributed to other terminals by the base station, of first time frequency resource distributed to the terminal; the terminal skips the second time frequency resource according to the indication information; data transmitted via a part, other than the second time frequency resource, of the first time frequency resource is subjected to data decoding operation. Via adoption of the data processing method and device disclosed in the an embodiment of the invention, data demodulation efficiency and correct rates can be improved.

Methods for configuring Channel State Information (CSI) feedback signalings, feeding back CSI, configuring data demodulation, data demodulating, configuring antenna port information, obtaining antenna port information, base stations and terminals are disclosed. The method for configuring CSI feedback signalings includes: the base station configuring N CSI measurement processes for measuring and feeding back CSI for the terminal, each of them being independently configured with one or more of the following through terminal dedicated higher layer signaling: codebook subset restriction, PMI-RI-Report, PMI feedback-enabled, RI feedback-enabled, RI feedback-enabled according to reference process, PMI feedback-enabled according to reference process, sub-band feedback-enabled according to reference process, feedback mode, resource location fed back by PUCCH corresponding to CSI measurement process, subframe offset and cycle fed back by PUCCH corresponding to CSI measurement process, and initialization sequence ID of PUCCH corresponding to CSI measurement process; the base station sending the N CSI measurement processes to the terminal.

The present specification discloses a method for transmitting a demodulation reference signal (DMRS) for uplink data demodulation by a machine type communication (MTC) device which is configured to operate in only a part of the system band of a cell. The method may comprise the steps of: mapping a DMRS sequence to 12 sub-carriers of a physical resource block (PRB); and dividing the PRB, to which the DMRS is mapped, into N sub-PRBs. Here, each of the sub-PRBs may comprise 12/N sub-carriers to which the DMRS is mapped. The method may further comprise a step for transmitting the N sub-PRBs to a base station in N sub-frames.

The invention discloses a data demodulation method for polarization maintaining fiber stress sensing. The method comprises the following steps of: acquiring an interference signal by using a polarization maintaining fiber stress sensing test system to acquire photovoltage data; pre-processing the photovoltage data, averaging every n points to acquire new photovoltage data, and data volume; decomposing a photovoltage data signal into an intrinsic mode function (IMF) component and an allowance by an experimental mode method; finding out a basic component and identifying a small coupling point; reconstructing coupling intensity of a signal, and calculating the stress magnitude through intensity of each coupling point so as to realize the distributed detection of a system; and calculating indexes which can show the system test accuracy, such as a signal-to-noise ratio and the like. The method can effectively improve the signal-to-noise ratio of the polarization maintaining fiber stress sensing system, and improves the identification capacity of weak coupling points and the sensitivity of a coupling test. Under the environment of relatively low signal-to-noise ratio, microstress can be detected well.

Disclosed is a method for improving demodulation correctness. The method comprises: encoding downlink channel information, and obtaining encoded data; then according to a district ID and a frequency point index, calculating the initial value of each frequency point pseudo random sequence; in a downlink channel, according to the initial values, calculating scrambling code sequences corresponding to the frequency points, and scrambling the encoded data through the scrambling code sequences; and a receiving end descrambling received data by use of the scrambling code sequences. By applying the embodiments of the invention, different scrambling code sequences are generated for different frequency points, the peak-to-average ratio can be reduced, and the correctness of data demodulation by a receiving end is further improved.

An embodiment of the invention discloses a downlink user dedicated demodulation reference signal transmitting method and device and relates to the field of wireless communication. The downlink user dedicated demodulation reference signal transmitting method and device are used for improving the data demodulation performance on a new carrier type (NCT) carrier. According to the downlink user dedicated demodulation reference signal transmitting method, a base station determines mapping resources of DM-RSs in a current sub-frame according to the DM-RS resource mapping mode; the DM-RSs are mapped into the current sub-frame for transmission according to the determined DM-RS mapping resources; a terminal determines the mapping resource of the DM-RSs in the current sub-frame according to the DM-RS resource mapping mode; the DM-RSs transmitted in the current sub-frame are obtained according to the determined DM-RS mapping resources. The DM-RS mapping resources at least comprise a resource unit RE on at least one of N former orthogonal frequency division multiplexing (OFDM) codes of the current sub-frame, and N is an integer no less than 1. The method can be used for improving the data demodulation performance of on the NCT carrier.

There is provided a method for placing reference signals in a wireless communication system. The method includes preparing a plurality of sub-frames for a plurality of antennas, placing a reference signal for one sub-frame and placing a reference signal for another sub-frame not to overlap with the reference signal for one sub-frame, wherein the reference signal for one sub-frame and the reference signal for another sub-frame are successively placed on contiguous OFDM symbols or on the contiguous sub-carriers. Channel estimation or data demodulation can be prevented from performance degradation.

Data aided carrier phase and symbol timing synchronizers are implemented at baseband as digital modulators isolating input signal inphase and quadrature component signals fed into inphase and quadrature Laurent transforms that function as data detector to provide odd and even data bit multiplexed output data signal while cross coupling the inphase and quadrature transformed outputs for removing data modulation in error signals to correct phase errors and timing errors in the received signal so as to provide reliable data demodulation of noisy received signals having dynamic carrier phase and symbol timing errors as found in continuous phase modulation communications systems such as Gaussian minimum shift keying communications systems.

The embodiment of the invention discloses user special-purpose demodulation reference signal (DM-RS) transmission and data demodulation methods and devices and relates to the field of radio communication so as to improve a resource utilization rate. In the methods and devices, DM-RSs are transmitted on REs on one or two OFDM signs different with an OFDM sign, on which synchronous signal transmission is carried out, in first N OFDM signs of a subframe so that a problem of overlapping of DM-RS mapping resources and synchronous-signal mapping resources is prevented and thus a problem that in a synchronous-signal transmitting subframe, part of PRBs in a system bandwidth are incapable of transmitting downlink data is prevented. Therefore, the resource utilization rate is improved.

In a digital data reproduction apparatus for demodulating digital data from an optical recording medium, PRML (Partial Response Maximum Likelihood) signal processing effective to high-density recording/reproduction is carried out by using a half rate processing offset control means which performs data demodulation using half of the channel bit frequency, a half rate processing phase sync control means, a half rate processing adaptive equalization means, and a half rate processing maximum likelihood decoder, and the digital data recorded on the optical recording medium are reproduced while restoring signal components which are missing in the time direction, by linear interpolation or Nyquist interpolation. Therefore, digital data reproduction performance is improved, and power consumption is reduced.

The invention provides indication information sending and receiving methods, a base station and a terminal. The sending method comprises that a control channel is determined according pre-determined time-domain and frequency-domain resources; and the indication information used to indicate the using condition of the preset time-frequency resource before the control channel is sent in the control channel. The receiving method comprises that the indication information used to indicate the using condition of the preset time-frequency resource before the control channel is received in the controlchannel; and the using condition of the preset time-frequency resource before the control channel is determined according to the indication information. The problem that down channel quality measurement and down data demodulation performances are decreased during multi-service time division multiplexing is solved.