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 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 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 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 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 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 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.