56results about How to "Guaranteed demodulation performance" patented technology

The present invention discloses a wireless communication method and device for reducing network delay. The UE sends the upstream signal. The upstream signal occupies part or all of the broadband symbols of the first short time slot. The duration of the first short time slot is less than 1 millisecond; the first short time slot is located in the first LTE subframe in the time domain; the first LTE subframe includes N short time slots. The number of the broadband symbols in the first short time slot is related to the location of the first short time slot in the first LTE subframe. If the first short time slot is the last short time slot in the N short time slots and includes the last broadband symbol of the first LTE subframe, the number of broadband symbols in the first short time slot is no less than K. Through designing the distribution method of the new short time slots in the LTE subframe, and the mapping method of the corresponding upstream signal and upstream reference signal, the present invention ensures channel estimation and transmission performance of the upstream signal and avoids the conflict of signal and SRS in the short time slot.

The invention discloses a method for transmitting a DMRS and equipment thereof. The main contents comprise that when a new DMRS transmission mode is configured, use of OFDM symbols distributed for the DMRS avoids the OFDM symbols used for transmitting a PSS / SSS in a TDD. A time-frequency unit used for transmitting the PSS / SSS in the TDD is avoided, and conflict with other signal transmission is reduced as far as possible so that demodulation performance after DMRS and PSS / SSS transmission can be guaranteed when the new DMRS transmission mode configured by the embodiment of the invention is utilized.

The invention discloses a method and a system for sending and detecting a control signaling and a demodulated pilot frequency, and a base station. The method includes the steps as follows: the base station maps sends the demodulated pilot frequency on M REs (Resource Elements) corresponding to a PRB (Physical Resource Block) according to a pattern mapped by the demodulated pilot frequency, wherein M represents a positive integer; the base station encodes and modulates the control signaling, maps the control signaling onto a resource with an REG (Resource Element Group) serving as a unit according to the pattern mapped by the determined control signaling and sends the control signaling; and a terminal detects the demodulated pilot frequency and the control signaling which are sent by the base station. With the adoption of the method and the system for sending and detecting the control signaling and the demodulated pilot frequency and the base station, the demodulating performance of the control signaling information can be guaranteed.

The embodiment of the invention discloses a method, a device and a system for transmitting pilot of a backhaul link. The method comprises the following steps that: base station equipment configures the pilot density according to channel conditions in a downlink transmission area of a relay node; and the base station equipment transmits the pilot to the relay node through the downlink transmissionarea of the relay node according to the configured pilot density, wherein the base station equipment determines the downlink transmission area of the relay node, and configures different pilot densities according to different channel conditions; and the pilot is not limited to a communal reference signal (CRS) and also can be applied to a demodulation reference signal (DMRS). The pilot which is transmitted by the base station equipment to the relay node through the downlink transmission area of the relay node comprises the CRS and the DMRS, a relay node-physical downlink control channel (R-PDCCH) is divided into a frequency division multiplexing (FDM) mode and a time division multiplex (TDM) +FDM mode, and the relay node receives and detect the pilot and demodulates the pilot. The embodiment of the invention improves the demodulation performance of the R-PDCCH and / or a relay node-physical downlink shared channel (R-PDSCH).

The invention provides a joint estimation method for carrier frequency offset, frame head phase position and fine symbol timing. The method comprises the following steps of: estimating integral frequency offset according to a received signal; performing integral frequency offset compensation according to the integral frequency offset; performing fractional frequency offset estimation; adding the integral frequency offset with the fractional frequency offset to obtain total carrier frequency offset, and performing total carrier frequency offset compensation according to the total carrier frequency offset; performing frame head phase identification on a first frame according to the received signal; and estimating the position fine symbol timing according to the frame head phase of the first frame. The invention further provides a system which corresponds to the method. According to the method and the system, carrier frequency offset estimation, frame head phase position and fine symbol timing can be rapidly realized on the premise of ensuring the demodulating performance of a receiver.

The invention discloses a method and a device for transmitting feedback information, and are used for enabling UE (user equipment) to efficiently judge a lost condition of a downlink dynamic scheduling signaling so as to feed back more accurate ACK / NACK (Acknowledgement / Negative Acknowledgement) feedback information, and are also used for reducing the bit number occupied by the ACK / NACK feedback information on each carrier so as to ensure the demodulating property of uplink transmission. The method comprises the following steps: utilizing the UE to receive the downlink dynamic scheduling signaling which contains the specific indicating information used for indicating if the downlink dynamic scheduling signaling is the last downlink dynamic scheduling signaling corresponding to a same carrier in a feedback window in which the downlink dynamic scheduling signaling is placed, wherein the feedback window is one or more downlink sub-frame for sending the feedback information by using a same uplink sub-frame; confirming the feedback information corresponding to the feedback window on the carrier corresponding to the downlink dynamic scheduling signaling by the UE according to the downlink dynamic scheduling signaling received from the same feedback window; and lastly sending the feedback information.

The invention provides a pre-compensation method for offset frequency of a mobile terminal of a low-orbit satellite, and the method comprises the steps: a mobile terminal completes downlink carrier capturing and tracking through a strategy of frequency pre-compensation of a first-stage frequency synthesizer and temperature compensation of a second-stage crystal oscillator, and guarantees the baseband demodulation performance; meanwhile, an uplink carrier signal of a sending end is pre-corrected, and it is guaranteed that the carrier is at the nominal frequency when reaching a satellite; large and time-varying frequency deviation of uplink and downlink signals of the satellite-ground communication system can be compensated in real time; and the defect of temperature drift of the crystal oscillator can also be overcome, and relatively high frequency modulation precision can be achieved, so that a relatively good deviation correction effect can be achieved even if the mobile terminal works in a high-power state.

The present invention discloses a method capable of ensuring dual-channel tracking receiver frequency spreading and hopping system angle error signal demodulation performance. A sum channel receiver is used to carry out frequency hopping synchronization, pseudo-code synchronization and carrier synchronization on a sum signal. A difference channel receiver divides the bandwidth of a whole frequency spreading and hopping signal into N frequency sub areas according to a frequency hopping pattern. A difference signal is subjected to de-hopping processing by using the frequency hopping pattern T(t) obtained by the sum channel receiver, and the de-spreading processing is carried on the difference signal by using an obtained direct spread pseudo-code PN(t). The orientation and pitch phase shift controlling are carried out by using an obtained carrier phase PHi(t) and then related detection is carried out with the difference signal. Each of the frequency sub area is subjected to the smoothing processing of the angle error signal according to a same integration time. The respective angle error signal of N frequency sub intervals is obtained. The N groups of angle error signals obtained by the N frequency sub intervals are subjected to normalizing weighting processing to obtain final angle error voltage according to the weight of the gated signal energy of each frequency sub interval signal in a signal total energy in an integration time T.

The invention discloses a pilot signal emission method, a channel estimation method, a channel estimation device and a channel estimation system. The pilot signal emission method comprises the following steps: a pilot signal I CPICH1 is emitted on a first antenna, and a pilot signal II CPICH2 is emitted on a second antenna; a pilot signal CPICHk1 is emitted on a k1th antenna; and when the fact that a first type of terminals existing in a multi-input multi-output (MIMO) system are dispatched is determined, a pilot signal CPICHk2 is emitted on the k1th antenna. By means of the pilot signal emission method, interference on traditional terminals by the pilot signals can be well reduced, the effect that the first type of terminals in the MIMO system can work well is guaranteed, the properties of the traditional terminals are guaranteed at the same time, and power consumed for emitting pilot frequency can also be effectively lowered.

The invention discloses a method, a device and a system for regulating and indicating transmission power and aims to ensure the demodulation performance of an enhance-uplink control channel (E-UCCH) of a network side in a system employing a high speed unlink packet access (HSUPA) technology. The method comprises the following steps that: a radio network controller (RNC) informs user equipment (UE) of knowing the receiving and demodulation threshold of E-UCCH information on an enhance-physical uplink channel (E-PUCH) through a signaling, then the UE sets initial transmission power on the E-PUCH as threshold transmission power corresponding to the receiving and demodulation threshold, therefore, when the UE performs incremental regulation on the initial transmission power to acquire target transmission power on the E-PUCH later, even if the target transmission power is lower than authorization transmission power acquired on the E-PUCH by the UE, the information demodulation performance of the E-UCCH of the E-PUCH is ensured in priority, and then the service reliability of a system is improved. The invention also provides the device and the system corresponding to the method.

The invention discloses a wireless transmission method, device and system. The wireless transmission method comprises the steps that a base station obtains the downlink transmission delay of each component carrier wave of current carrier wave aggregation; the base station determines the time sequence for transmitting each component carrier wave according to the downlink transmission delay of each component carrier wave, wherein the time sequence ensures that the maximum time difference among the component carrier waves received by a terminal is smaller than a preset threshold value; the base station transmits the signal on each component carrier wave according to the time sequence. According to the wireless transmission method, device and system, the maximum time difference among the component carrier waves received by the terminal can meet the TAE requirement, and the demodulation performance of the terminal is guaranteed.

The invention relates to a frequency offset calibration method. The method comprises the following steps: performing matched filtering processing on the data of each antenna according to channel estimation results after acquiring the channel estimation result of each antenna; performing frequency offset compensation on the matched filtering result of each antenna respectively according to the frequency offset of a user on each antenna; acquiring correction data after frequency offset compensation, and performing multi-antenna combination on the correction data. By adopting the frequency offset calibration method, the problem of incapability of evaluating an accurate frequency offset estimation value by averaging a plurality of antennas caused by large frequency offset difference among the antennas of distributed antennas is solved, the accuracy of frequency offset estimation is increased, and the demodulation performance is ensured.

The invention relates to a channel estimation method and apparatus, a wireless receiving device and a storage medium. The channel estimation method comprises the following steps of receiving communication sub-frames borne on sub-carriers in a communication link; acquiring a Doppler frequency offset of the communication link; determining a channel estimation strategy according to a frequency offsetthreshold value and the Doppler frequency offset; and according to the communication sub-frames borne on the sub-carriers and the channel estimation strategy, performing calculation to obtain channelestimation values of data symbols in the communication sub-frames. According to a value relation between the Doppler frequency offset and the frequency offset threshold value, the optimal channel estimation strategy is adaptively matched, so that on the basis that the demodulation performance of a system is ensured, the algorithm complexity of the channel estimation strategy is reduced.

The invention relates to a multipath searching method and device of adaptive adjustment search windows. The method comprises the following steps: a community is established, and an initial value of a softer switch newly added uplink search window is configured to be a search windows(max), which is set according to a radius coverage area together with a protection segment L configured to the community by a radio network controller RNC; and the size of the softer switch newly added uplink search window is dynamically adjusted under the search windows(max) according to link gravity center distribution of a searched effective-path-to-normal-path search, and a success rate threshold of a softer switch wide-path-to-normal-path search. The method and device provided by the invention are adopted so that an uplink initial search window can be adaptively adjusted in different network scenarios so as to ensure demodulation performance of the uplink signal, and hardware resources can be effectively saved and the hardware utilization rate is enhanced.

The invention discloses a signal demodulation method, which comprises the following steps of: positioning an intermediate code of a signal and extracting a signal of one time slot; carrying out channel estimation and joint detection on the extracted signal; and carrying out hard decision on data subjected to joint detection. The hard decision step particularly comprises the following steps of: dividing the data into symbol data in front of the intermediate code and symbol data behind the intermediate code according to the position of the intermediate code and carrying out reverse order arrangement on the symbol data in front of the intermediate code; carrying out phase compensation on the symbol data in front of the intermediate code, which is subjected to reverse order arrangement, one by one and carrying out hard decision on the compensated data, wherein a phase compensation value of first symbol data closest to the intermediate code is zero and phase compensation values of other data are respectively a phase-angle difference of the hard decision of previous symbol data and data obtained after the previous symbol data is subjected to phase compensation; carrying out the same treatment on the symbol data behind the intermediate code according to the treatment method of the symbol data in front of the intermediate code, which is subjected to reverse order arrangement; after carrying out reverse order arrangement on the symbol data in front of the intermediate code, combining the symbol data in front of the intermediate code, which is subjected to hard decision, with the symbol data behind the intermediate code, which is subjected to hard decision.

The present invention relates to a self-adaptive multipath management method of a CDMA system, comprising the steps of: calculating a delay spread function, recursively searching peak values meeting a certain threshold from the delay spread function, recording positions and sizes of the peak values, and forming a peak value table according to order of energy size; performing path inspection for fingers in the peak value table, and outputting detection marks; refreshing synchronous states of the fingers according to a result of the path inspection; for a candidate finger in the synchronous state, if the peak value of the candidate finger exceeds a value obtained by multiplying the peak value of the finger with the minimum peak value in a finger table by an exchange threshold, exchanging the candidate finger and the finger to achieve refreshing of finger information; replacing the original path which has been distributed to the candidate finger and has a poor signal to noise ratio or has disappeared with a newfound path with a good signal to noise ratio, so as to achieve a refreshing process of the candidate finger; and finally extracting the fingers with big peak values from the finger table to configure a Rake receiver. The self-adaptive multipath management method of the present invention can improve an acquisition probability of actual paths and can reduce a false alarm rate.

The invention relates to the multi inputs multi output transmitting project optimizing method and the system in the wireless technology domain, the moving speed estimating cell is used to estimate the moving speed of the user, the proper MIMO beaming project is determined according to the said moving speed. The improvement of the transmitting efficiency on the base of assuring the demodulating capability of the receiving end would be reached. The invention improves the transmitting speed on the base of assuring the demodulating capability of the receiving terminal.

The invention relates to an optimization method of a measurement control message of a TD-SCDMA system, a method for acquiring a co-frequency interference neighbor cell list by a terminal and the terminal. The measurement control message at least comprises ID information of co-frequency neighbor cells of the cell located by the terminal, and the optimization method of the measurement control message comprises the step of adding auxiliary frequency point information of different-frequency neighbor cells of the cell located by the terminal in the measurement control message. The method for acquiring the co-frequency interference neighbor cell list by the system terminal comprises the steps of using the terminal for receiving the measurement control message which is issued from a network and comprises the auxiliary frequency point information of the different-frequency neighbor cells of the cell located by the terminal, using the terminal for acquiring the information of a first neighbor cell with a main frequency point which is the same with a working frequency point of the terminal from the measurement control message, using the terminal for acquiring the information of a second neighbor cell with an auxiliary frequency point which is the same with the working frequency point of the terminal from the measurement control message, and using the terminal for acquiring the co-frequency interference neighbor cell list through the acquired information of the first neighbor cell and the information of the second neighbor cell.

The embodiment of the invention discloses a method, a device and a system for transmitting pilot of a backhaul link. The method comprises the following steps that: base station equipment configures the pilot density according to channel conditions in a downlink transmission area of a relay node; and the base station equipment transmits the pilot to the relay node through the downlink transmission area of the relay node according to the configured pilot density, wherein the base station equipment determines the downlink transmission area of the relay node, and configures different pilot densities according to different channel conditions; and the pilot is not limited to a communal reference signal (CRS) and also can be applied to a demodulation reference signal (DMRS). The pilot which is transmitted by the base station equipment to the relay node through the downlink transmission area of the relay node comprises the CRS and the DMRS, a relay node-physical downlink control channel (R-PDCCH) is divided into a frequency division multiplexing (FDM) mode and a time division multiplex (TDM) +FDM mode, and the relay node receives and detect the pilot and demodulates the pilot. The embodiment of the invention improves the demodulation performance of the R-PDCCH and / or a relay node-physical downlink shared channel (R-PDSCH).

The invention provides a receiver for a full-duplex very high frequency data exchange system. The receiver Is characterized in that the output end of the internal circulator is connected with an amplitude limiter; the amplitude limiter is composed of a Schottky diode. The amplitude of a transmitted signal can be limited to be + 3dBm, meanwhile, the VHF frequency band insertion loss is smaller than 0.2 dB, the influence on the noise coefficient of a receiver is small, and the output of the amplitude limiter uses a medium power amplifier; the 1dB compression point is larger than the gain by more than 3dB, and it can be guaranteed that all active devices of the receiver work in a linear state. At the preceding stage of the receiver, the amplitude of a transmitted signal can be suppressed step by step through a plurality of amplitude limiters and amplifiers, and finally the transmitted signal is completely suppressed at the final stage of the receiver by using a filter.

The invention discloses a method and a device for measuring signal to noise ratio, and application thereof. The method comprises the following steps of: performing frequency-domain de-noising on a received uplink signal; performing fast Fourier inverse transform on the uplink signal subjected to the frequency-domain de-noising to acquire a time-domain channel impulse response; acquiring the power of each tap according to the time-domain channel impulse response; and utilizing the power of each time-domain tap to estimate the signal to noise ratio. Through the method and the device for measuring the signal to noise ratio, and the application thereof, the signal to noise ratio of the uplink signal in a long-term evolution LTE system can be effectively measured and the demodulation performance of blind detection on uplink acknowledgement response ACK or non-acknowledgement NACK signals is ensured.

The invention discloses an uplink reference symbol transmission method and system, and user equipment wherein the method comprises the following steps: when user equipment needs to send data to a base station, mapping the uplink de-modulation reference signal (DMRS) on the first and the nth OFDM symbols of each sub-frame carrying the data; sending the data to the base station wherein n is bigger than one yet smaller than eight; when the base station receives the data, using the DMRS on each sub-frame to conduct channel estimation; and through the utilization of the channel estimation result, conducting demodulation processing to the corresponding received data. With the method, system and user equipment, it is possible to reduce the receiving and processing delay in PUSCH and to increase the demodulation performance of PUSCH under a high speed mobile scene.

The invention discloses a demodulation circuit applied to an ultrahigh-frequency tag. The demodulation circuit comprises a hysteresis comparator, an envelope detection circuit, and a high-low-pass filtering circuit, wherein the input end of the envelope detection circuit is connected with a radio-frequency antenna, the L0 end of the envelope detection circuit is connected with low level, and four low-threshold MOS transistors form a gate crossing structure; envelope detection signals are alternately conducted and output; and the high-low-pass filtering circuit adopts a current source, capacitor and resistor combined structure, a filtering function is realized by use of current sources I1 and I2, capacitors C1 and C2 and a resistor R, and the received envelope detection signals are filtered and transmitted to the hysteresis comparator. By adopting the demodulation circuit, the requirements of the ultrahigh-frequency tag on low power consumption, high performance and small area are met.

Disclosed in the present application are a method, apparatus and system for adjusting transmission power and indicating the same, which are for use in a system adopting the HSUPA technology to ensure the demodulation performance of E-UCCH on the network side. The method is as follows: an RNC enables UE to be informed, by way of signalling, of the receiving demodulation threshold of the E-UCCH information on an E-PUCH, then the UE sets the initial transmission power on the E-PUCH as a threshold transmission power corresponding to the above receiving demodulation threshold, so that when the UE subsequently carries out an incremental adjustment on the above initial transmission power to acquire a target transmission power on the E-PUCH, even if the target transmission power is reduced as compared with the authorized transmission power acquired by the UE on the E-PUCH, it will still be capable of giving priority to ensuring the demodulation performance of the E-UCCH information on the E-PUCH, thereby improving the system's service reliability. At the same time, the present application provides an apparatus and system corresponding to the method described above.

The invention relates to an optimization method of a measurement control message of a TD-SCDMA system, a method for acquiring a co-frequency interference neighbor cell list by a terminal and the terminal. The measurement control message at least comprises ID information of co-frequency neighbor cells of the cell located by the terminal, and the optimization method of the measurement control message comprises the step of adding auxiliary frequency point information of different-frequency neighbor cells of the cell located by the terminal in the measurement control message. The method for acquiring the co-frequency interference neighbor cell list by the system terminal comprises the steps of using the terminal for receiving the measurement control message which is issued from a network and comprises the auxiliary frequency point information of the different-frequency neighbor cells of the cell located by the terminal, using the terminal for acquiring the information of a first neighbor cell with a main frequency point which is the same with a working frequency point of the terminal from the measurement control message, using the terminal for acquiring the information of a second neighbor cell with an auxiliary frequency point which is the same with the working frequency point of the terminal from the measurement control message, and using the terminal for acquiring the co-frequency interference neighbor cell list through the acquired information of the first neighbor cell and the information of the second neighbor cell.

The present application discloses a method and device for processing channel quality information, including: determining the beam set periodically sent on the prefabricated beam by channel quality reference information according to the configured transmission parameters; determining the active prefabricated beam of the terminal; Select the same beam as the active prefabricated beam as the beam for reporting channel quality information. The embodiment of the present application ensures the demodulation performance of the terminal, thereby improving the network capacity.

The provided method comprises: measuring the background noise of subzone for real noise power to obtain the current upper loading value; according to relation between current and set load value, controlling the upper loading. This invention can improve system performance well.

The invention discloses a 16QAM demodulation method in a time division synchronous code division multiple access system, comprising the steps of: rotating the received signal and the coordinates of the constellation diagram where it is located by 45 degrees clockwise, and calculating the possible logarithmic likelihood ratio  of b0 0, 0 takes the maximum value of the calculation results, if 0 is greater than 0, then b0 is 0, otherwise b0 is 1; rotate the aforementioned signal and the coordinates of the original constellation diagram counterclockwise by 45 degrees, and calculate b1 according to the aforementioned method; according to b0, The demodulation result of b1 adjusts the aforementioned signal, and calculates 2 and 3 according to 2=x+y, 3=y-x. If the calculation result is greater than 0, the demodulation result of the corresponding bit is 0; otherwise, the demodulation result is 1. The present invention adopts the combination of phase rotation and segmented function, demodulation soft judgment mode, realizes 16QAM soft demodulation conveniently, not only has less calculation amount, but also guarantees demodulation performance effectively, thereby improves 16QAM in TD-SCDMA system demodulation efficiency and quality.

A cosine signal and Chirp signal combined signal modulating and demodulating method and a signal transmitting and receiving method based on the method relate to a modulating / demodulating method and a transmitting / receiving method of the signal. The invention settles the problem that the system performance is easily affected by the nonorthogonality between the dot signals of each constellation whenthe prior 8PSK or 16PSK modulation mode is adopted and lower system capability when the QPSK modulating mode is adopted. The modulating method is that the four binary digital signals and four orthogonal intermediate frequency signals obtained after series / parallel conversion are modulated for obtaining four modulating signals. The demodulating method is that the mixed signal to be demodulated isrespectively matched and correlated with four orthogonal intermediate frequency signals for obtaining the demodulated information after integral determination demodulation. The transmitting process isthat the received mixed signal is superposed after modulation and is transmitted after upconversion and bandpass processing. The receiving process is that the demodulated information is converted tothe demodulation information. The cosine signal and Chirp signal combined signal modulating and demodulating method and signal transmitting and receiving method based on the method are suitable for the modulating / demodulating process of the signal.