394results about How to "Downsampling" patented technology

The invention discloses a co-channel full-duplex system based on MPPSK modulation. After the system isolates receiving and sending signals at the radio-frequency head normally, cancellation conducted on leakage self-interference signals is finished on a digital baseband; the cancellation method is conducted after conducting shock filter on MPPSK receiving and sending aliasing signals, extracting and multiplying by coherent carrier, band-pass filtering and digitizing, the result of initial channels of all self-interference channels between the output end of a modulator and a receiver ADC is estimated before formal communication, self-interference offset signals are rebuilt by the adoption of the estimated result, further residual errors are filtered out with the combination of methods of coding rate filtering and double matched filtering of a method of shock filtering-multiplying by the coherent carrier-band-pass filtering-coherent demodulation, and MPPSK receiving signals are demodulated reliably. The co-channel full-duplex system based on MPPSK modulation is free of radio-frequency self-interference cancellation, has low requirements for the dynamic range and sampling rate of the ADC, has high isolation degree for the self-interference signals, and is simple in structure, low in complexity, high in spectrum efficiency and good in demodulation performance.

The invention provides a method based on linear programming for locating near-field targets and a system thereof, particularly a method for locating near-field targets on the basis of the compressivesensing theory. The method comprises the following steps: selecting a reference array element under the condition that the signal form is unknown, allowing the reference array element to work at the normal sampling frequency, and the other array elements to work at far below the Nyquist sampling frequency; taking the output signal of the reference array element as the reference target signal, to acquire the sample data of all the array elements; generating a time-delay table and a sparse basis array; generating a random mapping array and obtaining a coefficient array; obtaining a sparse vectorby linear programming solution; and acquiring the location information of the near-field target from the predetermined location-distance collection on the basis of the acquired estimation results ofthe sparse vector. According to the invention, the sensor does not need to work beyond the Nyquist sampling frequency, thereby greatly reducing the sampling rate, reducing the operating energy consumption of the sensor and improving the resource utilization rate of the system; and the method has no limits to the target bandwidth, so that the method is applicable to the target location of both narrowband and wideband, and the method is further applicable to non-Gaussian target location.

The invention provides a pilot protection method for the direct current line current abrupt change of a multi-terminal direct current transmission system. The method comprises the following steps of: 1, acquiring fault transient state current amperage; 2, calculating the current abrupt change in one period of time by using the acquired fault transient state current amperage, comparing the current abrupt change with a setting value according to the value of the current abrupt change and judging the direction of faults; and 3, distinguishing inside-area and outside-area faults by the cooperation of the current abrupt change directional elements at the terminals of a line; and if the directional element at each terminal is judged to have a forward directional fault, the fault is judged as the inside-area fault, and if at least one directional element is judged to have a reverse directional fault, the fault is judged as the outside-area fault. The method has the advantages that only current data is used, the required sampling rate is low, the current abrupt change is easy to calculate, the communication amount is small, and line faults can be rapidly detected; all energy information but a high frequency signal in a fault transient state is used, the signal energy is strong, and the protection is safety and reliable; and the method is applied to a parallel, a serial and a hybrid multi-terminal direct current system.

The invention discloses an identification method of a wireless transmitter based on RF fingerprints (RFF). The method comprises the following steps: receiving a wireless signal transmitted by the wireless transmitter, wherein the wireless signal is a preamble sequence transmitted by the wireless transmitter while power is increased gradually; detecting reference time of the wireless signal; according to the detected reference time, carrying out preamble signal interception on the wireless signal; converting the intercepted preamble signal into the RFF; carrying out feature extraction on the converted RFF and carrying out identification on the wireless transmitter. According to the identification method of the wireless transmitter based on the RFF, through using advantages that RFF separability is good and a required sampling rate is low, ramp-up RFF can be used for multiple RFF identification of wireless equipment based on the preamble so that purposes of increasing wireless network physical layer safety and so on can be realized, wherein the advantages are possessed by the ramp-up RFF (radio frequency fingerprints RFF) which is obtained through converting the preamble signal transmitted during the power is obliquely ascended.

The invention relates to the field of relay protection of direct-current transmission lines of power systems, in particular to a single-ended electrical quantity full-time quick-action protection method for recognizing faults inside and outside a high-voltage direct-current transmission line region. The faults inside and outside the high-voltage direct-current transmission line region are recognized by using an amplitude of a special frequency component of electrical quantity of the direct-current line side of a single-ended convertor station. The invention is mainly used in single-ended electrical quantity full-line quick-action protection of the direct-current transmission line in the power system, only needs to adopt the singe-ended electrical quantity, has low requirement on the sampling frequency and a simple algorithm, is easy to realize on the engineering, has the advantages of high action speed, good selectivity and high reliability, and is complete in theory and easy to integrate. The protection method in the invention can be used as the main protection of the direct-current transmission line instead of the traditional traveling wave protection, and is especially suitable for full-line quick-action protection of extra / super high-voltage direct-current transmission lines by using single-ended electrical quantity.

The invention provides a simulation method for a linear frequency modulation continuous wave synthetic aperture radar video signal, which comprises the following steps: simulated synthetic aperture radar system parameter information is set and read; the information parameter of a target is set; a simulated time is treated with discretization; the instantaneous positions of a radar platform and the target are respectively calculated, and a distance vector between a phase center and the target is obtained according to geometric position relation; a one-dimension echo signal is obtained by combining the echo signal mathematic model of the synthetic aperture radar and radar system parameters; the one-dimension signal is divided according to pulse repetition period and formatted into a two-dimension signal, the two-dimension signal with Na multiplied by Nr is obtained after the total data is stored, thus finishing the fine simulation of the linear frequency modulation continuous wave synthetic aperture radar video signal. The more accurate echo simulation signal can be obtained by utilizing the simulation method, and the simulation method is especially suitable for a frequency modulation continuous wave signal with high-speed movement, long distance and severe oblique observation condition of the radar and has more excellent realization efficiency, and stronger adaptability and compatibility.

The invention relates to a compressive-sensing-based sparse signal under-sampling method and an implementation device, which are used for lowering a sampling rate of frequency-domain sparse signals on the premise of guaranteeing the restoration effect of the signals. The method comprises the following steps of: generating a trigger signal and an m sequence by an FPGA (Field Programmable Gate Array), carrying out frequency mixing on the m sequence and the measured sparse signal after the m sequence is modulated, and carrying out filtering by a low pass filter; sampling the filtered signal and storing sampled data by a data sampling module after the data sampling module detects the triggering signal; and calculating a transfer function of a system and the m sequence corresponding to the sampled data when the signal is reconstructed, and then restoring the original signal by an OMP (Orthogonal Matching Pursuit) signal reconstructing algorithm. The compressive-sensing-based sparse signal under-sampling method and the implement device are suitable for the under-sampling of frequency-domain sparse analogue signals.

The invention discloses a broadband cognitive radio frequency spectrum detection method based on parallelly compressed sensing. The realization process is as follows: using each parallel subcircuit of a frequency spectrum detector to carry out independent compressed sensing on received signals to obtain a group of random sampling points of each subcircuit; using single restoration algorithm to reconstruct original signals and frequency domain signals thereof in the obtained sampling points; carrying out wavelet transformation on the reconstructed frequency domain signals to obtain a group of wavelet transformation coefficients; calculating the mean square error between the reconstructed original signals of each subcircuit and the received signals; multiplying the wavelet transformation coefficients of two subcircuits with the minimum mean square error and taking the maximum value to obtain the position of each sub-band, and taking the reconstructed frequency domain signal of the subcircuit with the minimum mean square error as the reconstructed frequency domain signal for final output to finish the detection of the cognitive radio frequency spectrum. The invention can reduce noiseand the influence of randomness of the sampling points, thus improving the probability of correct detection.

The invention provides a multispectral single-pixel imaging deep learning image reconstruction method, which comprises a measurement process and a reconstruction process, and is characterized in thatin the measurement process is characterized by using a coding pattern for coding a target scene, and then using a multispectral detector for recording the light intensities corresponding to differentwavelengths; after the multispectral single-pixel detection is realized in a physical mode, based on an image reconstruction method of a deep neural network, realizing a process of reconstructing anoriginal signal X from all detection signals Yc, wherein the deep neural network is composed of a linear mapping network and a convolutional neural network; splicing C measurement vectors together according to columns to form a new matrix Y ', wherein the linear mapping network uses Y' as the input data to preliminarily perform linear processing on the data, then subjecting the linear processing result to the information fusion processing between channels through the convolutional neural network, and finally obtaining a to-be-observed image X through reconstruction. According to the technicalscheme, the problems that in the prior art, the algorithm complexity is high, the reconstruction time is longer, and the requirement for the sampling rate is higher are solved.

The invention discloses a method and device for measuring the frequencies of high-frequency cosine signals under the undersampling rate, and relates to the field of digital signal processing. By combining the type of the zero crossing point with the distribution characteristic of apFFT phase spectrums, L spectrum position index values are selected from 2L peak value magnitude spectrum positions; according to the remainder selecting result, each apFFT phase spectrum is corrected through the all-phase ratio interpolation method so that the frequency of the apFFT phase spectrum can be estimated; the frequency estimation value obtained after each apFFT phase spectrum is corrected is used as a remainder, the remainders are processed according to the Chinese remainder theorem of the closed analysis form, and the frequencies of the original high-frequency signals are reconstituted through the frequency estimation values. According to the method and the device, the frequencies of the multiple paths of high-frequency cosine signals under the undersampling rate are measured, and the measuring range of the frequencies of the high-frequency signals is greatly widened; the novel spectrum correction method is adopted, and therefore the measuring accuracy of the frequencies of the high-frequency cosine signals is improved, and novel anti-noise performance of the high-frequency cosine signals under the low undersampling rate is ensured.

The invention discloses a broadband spectrum sensing method based on a space-frequency joint compressed sensing. The method comprises the technology of synchronization of compressing and sampling and direct-acquisition of compressed data and wireless sensor network spectrum sensing technology, and constructs a spatial wavelet and a two-dimensional compaction of airspace and a frequency domain method. The broadband spectrum sensing method based on the space-frequency joint compressed sensing has the advantages of improving detection probability of a spectrum hole by perceiving double sparsity of electricity in airspace and frequency domain on the premise that a compression ratio is not increased.

The invention discloses a voltage and power balance control method for a modular power electric transformer. The power electric transformer to which the method is applied to comprises an input stage, an isolation stage and an output stage; the input stage adopts common duty ratio control based on single phase dp decoupling, so that stable control of high voltage side direct current voltage and flexible adjustment of sine and power factors of input current are achieved; the isolation stage adopts a voltage power double loop control strategy without a current sensor, the output voltage outer loop adjustment generates a unified reference value of each power inner loop, and the adjustment of each power inner loop generates a phase shifting angle of each module of the isolation stage; and two types of control strategies of the input stage and the isolation stage act synergistically, so that voltage and power balance of each module of the power electric transformer is achieved.

The invention provides a compressed spectrum sensing method based on autocorrelation matrix reconstitution and mainly solves the problem that an existing sensing algorithm is high in sampling speed and large computation overhead. The compressed spectrum sensing method comprises that a secondary user obtains an observation sequence of a frequency spectrum environment through compressed sensing and obtains an autocorrelation matrix estimated value of Nyquist sampling by utilizing autocorrelation vector quantity of a autocorrelation matrix reconstitution Nyquist sample sequence of the observation sequence; a multi-signal classification MUSIC algorithm is adopted to obtain an estimated value of occupied channel number according to a characteristic value of the autocorrelation matrix estimated value; a characteristic spectrum is constructed according to the characteristic value and the estimated value of the occupied channel number, spectral amplitude values corresponding to characteristics of channels are added to obtain a sum, and mark numbers of the occupied channels are judged. By means of the compressed spectrum sensing method, the sampling speed of a secondary user receiving machine can be reduced, algorithm complexity at the reconstitution end is low, and spectral amplitude occupying situation in a cognitive radio system can be judged quickly.

A method for realizing total digital wireless communication system utilizing quick Fourier conversion is that at the emit end, the transmitted data is in the structure of burst based on packets to form a symbol stream used in transmission by channel encoding, channel interlace and symbol image device and to turn the serial into the parallel as the input of orthogonal modulator which caries out P times orthogonal modulation to each set N point input symbol sequence in the following steps: carrying out frequency domain phase rotation to the input N points symbol sequence, quickly inverting the Fourier conversion then to rotate the time domain phase, regulate the sequence via parallel / serial conversion, adding circulation prefix and modules converter to be emitted, at the receive end, signals received by the antenna are turned to output data by modules conversion, serial / parallel conversion and phase rotation N points quick Fourier conversion, channel estimation frequency balance, parallel / serial conversion, symbol inversed image channel de-interlace and channel decode.

The invention discloses a UHV DC transmission line protection method utilizing current abrupt change characteristics based on a distributed parameter model. The UHV DC transmission line protection method comprises the steps of processing voltage and current signals measured by transformers at both ends of a DC line by means of an intelligent electronic device (IED), and identifying internal and external faults according to polarities of current abrupt variables. The UHV DC transmission line protection method adopts a distributed parameter model for carrying out distributed capacitive current compensation, eliminates the influence of asynchronization of the distributed capacitive current and data. A protection criterion selects components with the frequency band of [0,100] Hz in current information, avoids the electromagnetic coupling between DC side characteristic harmonics and a bipolar DC line and the influence of lightning interference. The polarities of current abrupt variables at both ends of the line are Boolean quantities, and the communication traffic of longitudinal channels is small. The UHV DC transmission line protection method utilizing the current abrupt change characteristics based on the distributed parameter model only utilizes polarities of the current abrupt variables for identifying the internal and external faults, is simple in principle and small in communication traffic, and is stable and reliable.

The invention relates to a method for acquiring a wide-band frequency modulation stepped chaos radar signal, which comprises the following steps: acquiring an echo baseband signal rn(t) of each subpulse; then, correspondingly carrying out matched filtering or correlation processing on the baseband echo signal rn(t) of each subpulse and the respective baseband chaos sequence, thus obtaining a frequency domain signal Un(f) of each subpulse; carrying spectral migration on the frequency domain signal Un(f) of each subpulse, and then carrying out de-overlapping and phase compensation, wherein the frequency shift quantity of the spectral migration is equal to the frequency interval DELTAf of a local frequency source; and carrying out coherence stack on the subpulse signal subjected to de-overlapping and phase compensation, thus obtaining a synthesized large wide-band signal, wherein the band width of the synthesized wide-band signal is B+(N-1)DELTAf. The invention provides a new technical route for realizing a chaos radar signal having an ultra large band width. By combining the chaos signal and the frequency stepped signal, the advantages of the both are combined. The method provided by the invention is simple and clear, is easy to realize, is applicable to frequency linear / nonlinear stepping and has important practical meanings in an actual system.

The invention discloses a passive underwater target positioning method based on the compressed sensing of a multipath time delay structure. The method includes dividing a positioned three-dimensional region into N grid points; distributing a plurality of underground nodes on the shallow seabed, and positioning according to sea surface reflection path signals of nodes and delays of direct path signals of reference paths; performing sparse representation on the receive signals of the nodes under different delays of reference signal receive nodes; then comprising and sampling node data except for the reference nodes by means of random sampling matrix, positioning the central node and acquiring the target position by acquiring the target position sparse vectors by the compressed sensing recovery algorithm according to node observation data. By the aid of the method, the sampling rate of underground nodes can be decreased greatly, the requirements on underwater communication bandwidth are lowered, and the method is adaptive to target positioning in the multipath underwater environment, is easy to implement and has high practical applicant value.

The invention relates to the field of voice talkback, in particular to a voice talkback device and method based on a LORA (Long Range) technology. The device comprises a gateway and a node, wherein the gateway is in a communication connection with the node; the gateway is equipment in which a LoRa gateway and a server are integrated; the node is LoRa talkback equipment; the gateway comprises a gateway microcontroller, a gateway LoRa radiofrequency module and a gateway power supply module; the gateway LoRa radiofrequency module and the gateway power supply module are connected with the gateway microcontroller respectively; the node comprises a node microcontroller, a node LoRa radiofrequency module, a node power supply module, a play module and an audio encoder / decoder; and the node LoRa radiofrequency module, the node power supply module, the play module, an input module and the audio encoder / decoder are connected with the node microcontroller respectively. Through adoption of a LoRa communication technology and the audio encoder / decoder, the problems of large size and short standby time of an existing interphone are solved by means of the characteristics of low power consumption, long distance and low price of LoRa.

The embodiment of the invention provides a mechanical device vibration signal monitoring adaptive variable sampling method and device. The method comprises the steps of: collecting vibration signals of a mechanical device; performing time-domain analysis and frequency-domain analysis of the vibration signals to correspondingly confirm whether the vibration severity and a fault feature frequency amplitude of the mechanical device are abnormal or not; if yes, adaptively improving a sampling rate of the next sampling; or else, adaptively reducing the sampling rate of the next sampling. Accordingto the embodiment of the invention, the mechanical device vibration monitoring system energy consumption and data bulk can be reduced, and the universality is good.

The invention relates to an ultra-wideband receiving method based on the frequency division section parallel sampling and mainly comprises the following steps: converting multi-channel analog signals treated by each radio frequency module into multi-channel digital baseband signals; carrying out the pretreatment of synchronization and frequency-offset correction of the digital baseband signals; carrying out frequency diversity of pretreated data on different carrier frequencies; recovering and treating the data after the frequency diversity and obtaining the received data needed. The invention also relates to a receiving terminal which realizes an ultra-wideband system. A receiving method and the receiving terminal thereof which can realize the ultra-wideband system take full advantages of richer spectrum resources of the ultra-wideband system and adopt a baseband treatment scheme based on the frequency division section parallel sampling and the frequency diversity, which can effectively reduce the sampling rate of ADC and the operation bandwidth of radio frequency devices such as a low-noise amplifier, a frequency mixer, and the like, thus greatly reducing the difficulty and the complexity of designing ultra-wideband chips and realizing the system.

The invention discloses a high precision frequency measurement method and instrument at the under-sampling rate. The method includes the steps that spectrum correction is conducted through a triple-spectrum-line interpolation method, L pairs of frequency estimated values obtained after spectrum correction is obtained, and L pairs of phase information obtained after peak position correction is obtained; with the combination of the zero crossing point type and the L pairs of phase information obtained after correction, L frequency estimation values are picked out from the L pairs of frequency estimation values; all spectrum correction values and the L frequency estimation values are adopted as the remainder, and the frequency of an original high-frequency signal is reconstituted according to the Chinese remainder theorem in the closed analytical form. According to the measurement instrument, a single to be tested is subjected to the zero crossing point measurement processing firstly, and the original phase of the signal to be tested is determined; then sample sequences are obtained after analog / digital converter sampling with multi-path sampling frequency is conducted, the sample sequences enter a DSP device in the form of parallel digital input respectively, and frequency estimation of a high-frequency signal is obtained after internal processing is conducted through the DSP device; finally the frequency value is displayed with the help of an output driver and a display circuit of the output driver.

The invention discloses an asymmetric phase encoding ranging method applied to a laser radar system. The laser radar system uses a typical phase encoding method and has high system hardware demands. The method provided by the invention comprises the steps that a laser in the laser radar system emits a laser signal with constant intensity; a modulator carries out intensity modulation according to a modulation signal sequence; the modulation signal sequence is an m sequence; a demodulator carries out intensity demodulation on an echo signal according to a demodulation signal sequence; a strobe mode is used to control cumulative detection time and output of a detector; the detector outputs cumulated signals to a signal processor; the signal output order of the detector shows a correlation peak position, so that the signal processor directly determines phase difference between a demodulation signal and the echo signal; and according to the phase difference, target distance is calculated. According to the invention, the asymmetric phase encoding method is used to measure the target distance; the sampling rate requirement of the system on the detector is reduced; and the calculation amount of signal processing is reduced.

The invention relates to an impedance measurement device and method based on a random demodulator. The impedance measurement method is characterized by comprising the following process: applying sinusoidal voltage excitation to an impedance element to be measured; converting a current signal passing through the impedance element into a voltage signal through a current-voltage conversion circuit; after the voltage signal is randomly modulated through a two-path switch and passes through a low-pass filter, carrying out low-speed sampling by an A / D (Analog / Digital) converter to obtain a low-speed sampling sequence; and carrying out signal reconstruction on an upper computer by using the low-speed sampling sequence to obtain power spectrum information of the voltage signal output by the current-voltage conversion circuit, so as to obtain a signal amplitude, a phase and an element resistance value and realize the impedance measurement based on the random demodulator. With the adoption of the method provided by the invention, the impedance measurement is realized when ADC (Analog to Digital Converter) sampling frequency is lower than the frequency of the sampled signal; a multiplying unit is not needed, and only low-power-consumption devices including the electronic switch, the low-speed analog-digital converter and the like are needed; and the impedance measurement device and method have the characteristics of low cost, low power consumption, less resource consumption and simplicity in realization, and have a wide application prospect.

The invention discloses an island microgrid hierarchical control strategy based on an event triggering mechanism. According to the control strategy, a primary control model dominated by droop controlis established and is responsible for reasonably distributing active power and reactive power; and the problem of voltage and frequency deviation is solved. A control strategy based on centralized event triggering is designed; an auxiliary centralized controller is used for generating a DG synchronous trigger signal to update control input; on the basis, a voltage control strategy based on distributed event triggering is designed and popularized to frequency and active power control, each DG generates asynchronous triggering signals through a local controller of the DG to update respective control input, and complete distributed event triggering control is achieved. Compared with a traditional control strategy, invalid sampling signals are reduced, the economical efficiency of system operation is improved, and meanwhile the degree of dependence of secondary control on a communication network is reduced.

The invention discloses a method for processing the channel measurement data of an ultra wide-band (UWB) compressive sensing frequency domain and belongs to the field of communication. The method comprises the following steps of: for UWB channel measurement data in a mode of frequency domain measurement, designing a window function to intercept the channel measurement data of a target frequency range; by using a time domain pulse which corresponds to the window function as prior information, constructing an ultra-complete waveform dictionary to make a time domain channel measurement signal more sparsely represented; by using a greed tracking algorithm as a compressive sensing reconstruction algorithm and reconstructing the time domain channel measurement signal, finishing deconvolution of the signal so as to reduce the sampling rate of measurement equipment on the premise of no reduction of deconvolution accuracy. The invention also discloses a method for modeling a UWB compressive sensing multi-path channel. By using the characteristic of a correspondence relationship between the success reconstruction probability of a group of channel measurement data in a compressive sensing theory and observation sample number, and the characteristic of limitation on the success reconstruction probability by channel average multi-path number, a relationship model between the observation sample number and the channel average multi-path number is established.

The invention provides a dechirp receiving method of a radar echo signal. The method comprises the following steps: A, performing analog-digital conversion for a received radar echo signal in an analog form to obtain a radar echo signal in a digital form; B, generating a reference local oscillator signal in the digital form; C, multiplying the radar echo signal in the digital form by the reference local oscillator in the digital form so as to counteract a secondary phase term of which the frequency linearly changes over time in the digital echo signal and obtain a dot frequency signal related to a target position, thus finishing the dechirp receiving of the radar echo signal. According to the dechirp receiving method of the radar echo signal, a dechirp reference signal in the digital form is adopted, an analog dechirp reference signal can be avoided generating, and therefore, the size, power consumption and interference are reduced while the difficulty and complexity are lowered down.

The invention discloses a partial K space sequence image reconstruction method based on self-adapted double-dictionary learning, and the method is mainly used for solving the problems of an existing method that the quality of a reconstructed image is more seriously reduced under the condition of sampling under 10 times. The partial K space sequence image reconstruction method comprises the following main steps of: collecting partial K space data and utilizing the correlation between the partial K space data to be integrated into complete K space data; obtaining a training image by the complete K space data; utilizing a KSVD (Kernel Singular Value Decomposition) algorithm to train the training image to obtain dictionaries with high and low resolution ratios; and utilizing a relation between the dictionaries with the high and low resolution ratios to reconstruct the input partial K space data, and carrying out residual error compensation on the reconstructed image to obtain a more accurate reconstruction result. According to the partial K space sequence image reconstruction method disclosed by the invention, the quality of the reconstructed image can be effectively improved under the condition of sampling under 10 times; and the partial K space sequence image reconstruction method can be used for reconstructing MRI (Magnetic Resonance Imaging) sequence images of a plurality of parts.

The invention provides an all-digital demodulation method based on an open loop structure. The receiver firstly filters out-of-band noise of an obtained digital baseband signal through a matching filter, detects a burst signal on the basis of a double-sliding-window algorithm; an O & M algorithm is adopted to complete timing error estimation of the burst signal, controls a cubic interpolation filter to carry out interpolation operation on the obtained sample value through a timing error; and performs cross-correlation operation on the signal after timing synchronization and a local synchronization code element to complete frame synchronization and eliminate a frequency offset error, and finally, removes phase offset through a phase offset estimation algorithm based on a maximum likelihoodcriterion to complete stripping of a carrier, thereby obtaining a recovered baseband signal. The sampling rate is reduced, and the calculation complexity is reduced. The method is simple, the demodulation effect is good, the noise tolerance is high, and the reliability and efficiency of burst signal demodulation are improved.

The invention discloses an uplink receiver of a long term evolution (LTE) base station system. The uplink receiver comprises a base band unit (BBU) and a remote radio unit (RRU); the BBU and the RRU are connected by an interface Ir (interface between the RRU and the BBU). The RRU includes a fast fourier transformation (FFT) module. The RRU is used for receiving data, carrying out FFT processing on the received data, and sending the processed data to the BBU by the Ir; and the BBU is used for receiving the data from the RRU by the Ir. Correspondingly, the invention also discloses a data processing method of the uplink receiver. The sampling rate and the data bit width are reduced. Therefore, the Ir uplink data transmission flow is effectively reduced, the cost of transmission from the RRU to the BBU is lowered, and the optical fiber resources laid at the Ir are saved; and thus an objective of saving of the equipment cost and the maintenance cost is achieved.

The method includes following steps: through software, a radiotechnics is introduced into demodulator based on structure of limiter coupling with discriminator to make the angle resolution of demodulator is not limited by sampling rate; the reception matched filter adopts root raised cosine filter (RRCF) to make problem of which demodulator with structure of hardware limiter is sensitive to roll-off factor of root raised cosine filter is solved. The invention can be applied in PHS and PCS system, signal demodulation based on PSK modulation technology like satellite communication system.