39results about How to "Reduce demodulation complexity" patented technology

The invention provides a faster-than-Nyquist rate block transmission method, a transmitter, a receiver and a system. Code elements to be transmitted are subjected to shaping filtering operation at a faster-than-Nyquist rate, cyclic superposing operation is performed, block symbols capable of keeping the faster-than-Nyquist rate and keeping head-tail circulation, protection intervals are added to symbol blocks, and transmitting base-band symbols are formed. Via the protection intervals, a receiving end is enabled to eliminate ISI caused by a multipath information channel via simple equalization, head-tail circulation block symbols formed via cyclic superposition are used for eliminating self ISI caused by transmission at the faster-than-Nyquist rate via time domain or frequency domain equalization, and therefore demodulation complexity of the receiving end can be lowered.

The invention relates to a multi-communication terminal transmit diversity and transmit diversity relay method in wireless communication system, comprising the steps: multiple communication terminals use their respective source transmission channels to transmit signals; signal gathering point receives these signals and makes linear conversion on these signals and uses multiple channels to transmit linear converted signals, where each channel in multiple channels transmits a linear combination of signals transmitted by multiple communication terminals; and at the receiving end, demodulating the signals transmitted by the signal gathering point.

The invention provides an ARTM CPM demodulation and synchronization method with low implementation complexity. The method comprises the following steps: firstly performing two-stage delay on a received signal to obtain three branch signals; then separately performing mixing, low-pass filtering, matching filtering and phase compensation processing on the three branch signals, performing viterbi demodulation processing on the I branch signal, then calculating a timing error and a carrier phase error by using a demodulation processing result, and finally adjusting code NCO and carrier NCO by using filtering results of the timing error and the carrier phase error to realize symbol timing synchronization and carrier phase synchronization. Compared with the existing optical demodulator, the method provided by the invention has the advantages that the error bit performance loss is smaller, the number of matching filters and the number of states necessary for demodulation are greatly reduced, the implementation complexity can be greatly reduced, and that the stability of the system can be effectively improved.

The invention discloses a space-time continuous phase modulation (CPM) signal modulation method and a space-time CPM signal demodulation method. By the space-time CPM signal modulation method for preprocessing a CPM signal before modulation, a receiver can demodulate the received CPM signal in a linear signal demodulation way to reduce the demodulation complexity. Before CPM modulation is performed on a transmission sequence, the preprocessing before the modulation is performed at first, and comprises a segmented mapping step, an intra-segment redundancy addition step, a primary precoding step, an intra-segment redundancy regulation step, a time reversal and negation step, a secondary precoding step, a cyclic prefix addition step, an intra-segment redundancy addition step and a space-time signal formation step. In the methods, a transmitter adds cyclic prefixes to the sequence, and a signal received by the receiver is the cyclic convolution of a transmitted signal and a channel; therefore, when receiving the modulated CPM signal, the receiver can demodulate the CPM signal in the linear signal demodulation way.

The invention provides a quaternary continuous phase modulation-demodulation method which can increase the effective utilization rate of a spectrum, reduce signal coherent demodulation calculation and decrease complexity of a receiver. The technical scheme includes that in signal modulation, at an input end of a multi-system continuous phase modulation signal transmission system, a signal selection logic module performs combined logic operation according to front and rear adjacent input bit messages every time, two bit messages are mapped into absolute phase values of a certain determined position for transmitting modulation signals by a baseband signal collection module, baseband signals are modulated on carrier waves by transmitting the absolute phase values to an I modulation module and a Q modulation module, radio-frequency signals wirelessly received by an antenna are converted into the baseband signals by the aid of a quadrature demodulation module, the baseband signals are inputted to a baseband signal synchronization module, a symbol demodulation module takes amplitude values of real portions and imaginary portions of baseband complex signals at the synchronization position as bipolar numerical values of the two bit messages carried by a symbol, and the signals are demodulated by an information conversion module according to bipolar information conversion rules.

The invention provides a channel monitoring and energy-saving signal processing method and a device, a terminal and network side equipment. The monitoring method comprises the steps that the terminalenters an energy-saving mode to monitor an energy-saving signal; and in the energy-saving mode, the terminal determines whether a downlink control channel needs to be monitored according to whether the energy-saving signal is monitored. In the method of the invention, the terminal in the connected state does not continuously monitor the downlink control channel any more; the energy-saving signal is monitored in the energy-saving mode instead of the downlink controllable channel, whether the downlink control channel needs to be monitored is determined according to whether the energy-saving signal is monitored, the demodulation complexity of the energy-saving signal is lower than that of the downlink control channel, and / or the frequency or time for monitoring the energy-saving signal is less than that for monitoring the downlink controllable channel, thereby reducing the power consumption of the terminal.

The invention discloses a method and a device in user equipment and a base station used for wireless communication. The user equipment monitors the first sequence in a first time window; if the firstsequence is detected in the first time window,blind detection for first signaling is executed on K1 alternative RE sets; the first signaling occupies one of the K1 alternative RE sets in a time-frequency domain; each RE included in the K1 alternative RE sets belongs to an alternative time-frequency resource pool, the alternative time-frequency resource pool belongs to a second time window in the time domain, and the first sequence is used for determining the starting time of the alternative time-frequency resource pool in the second time window. According to the method, the starting time of the alternative time-frequency resource pool is determined by adopting the first sequence, so that the sending opportunity of the control signaling is improved on the premise of not increasing the blinddetection frequency of the user equipment, and the spectrum efficiency and the overall performance of the system are improved on the unauthorized spectrum.

The invention provides an FBMC (Filtered Bank Multi-Carrier) symbol modulation and demodulation method and device. The modulation method includes executing carrier mapping; performing inverse Fourier transform on a combined frequency domain sequence so as to obtain a time domain sequence of FBMC symbols subjected to modulation, executing at least one operation among the below during the carrier mapping executing process so as to enable the time sequence of a Q-channel FBMC symbol in the time domain sequences of the FBMC symbols to offset odd number times of a half of the total carrier number of the symbol sequences than the time domain sequence of an I-channel FBMC symbol in the time domain sequences of the FBMC symbols subjected to modulation: multiplying even number symbol sequences and odd number symbol sequences among the I-channel FBMC symbol sequences respectively by a preset first linear phase and a preset second linear phase, and multiplying even number symbol sequences and odd number symbol sequences among the Q-channel FBMC symbol sequences respectively by a preset third linear phase and a preset fourth linear phase. By adopting the above scheme, FBMC symbol modulation and demodulation complexity is reduced.

The embodiment of the invention provides a Bluetooth low-power-consumption multi-phase frequency shift keying modulation / demodulation method and device, and the method comprises the steps: grouping inputted binary data streams, each group comprising a plurality of bits; mapping the binary data stream into a phase sequence in which one binary data set is mapped into one phase of a predetermined phase set by Gray encoding; and modulating the phase sequence into a phase signal by using a phase waveform obtained by integrating a preset frequency waveform. When the baseband signal obtained based onthe phase signal is used for Bluetooth low-power-consumption signal transmission, high power amplification efficiency, low demodulation complexity and high anti-multipath interference performance canbe maintained while the BLE wireless transmission rate is improved.

The invention discloses an information transmission method, a device and electronic equipment . The information transmission method comprises the steps of sending first information to at least one second device, wherein the first information is used for triggering the second equipment to carry out auxiliary information transmission or is used for the second equipment to carry out resource selection or reservation. According to the embodiment of the invention, the first device sends the first information to the at least one second device, and the first information indicates the second device to carry out auxiliary information transmission or indicates the second device to carry out resource selection or reservation of data transmission, so that the transmission reliability can be improved, and the demodulation complexity can be reduced.

The invention discloses a data forwarding method, relay equipment and a wireless communication system. The data forwarding method comprises the following steps: receiving data from a source device; demodulating and decoding the received data; encoding the decoded data; remapping a modulated constellation diagram of the source device into a modulated constellation diagram with lower modulating order; performing order-reduced modulation on the encoded data according to the remapped modulated constellation diagram; and transmitting the modulated data to a target device. Due to the use of the data forwarding method and / or the relay equipment, the system capacity can be fully improved.

The invention belongs to the communication technology field and discloses a Chirp non-equal error modulation method based on a plasma sheath channel, and an aircraft. At a signal emission end of a system, three different sequences m(t), n(t) and c(t) are generated and are respectively utilized to modulate the slope rate, the carrier frequency and the phase of a Chirp signal; composite modulation of the Chirp signal is carried out; the Chirp signal passes through the plasma sheath channel; after the signal passes through the plasma sheath channel, a received signal is subjected to fractional order Fourier transform of the optimal order corresponding to positive and negative slope rates at a receiving end, and data is sampled at the best focusing position corresponding to different carrier frequencies; demodulation is carried out based on the sampled information to obtain a transmitted message sequence. The method is advantaged in that that important information is transmitted with priority is guaranteed when a spacecraft passes through the blackout area, moreover, compared with an existing FSK transmission scheme, demodulation complexity is reduced, and the bit error rate is furtherreduced.

The invention provides a non-uniform modulation and demodulation method and system in a wireless broadcast communication system, a medium and a terminal, and the method comprises the following steps:dividing a constellation point into four groups of different subsets, enabling the four groups of different subsets to respectively correspond to four different quadrants where a received signal falls, and calculating a search space corresponding to each subset; calculating the Euclidean distance between the constellation point of the search space corresponding to the quadrant and the received signal according to the quadrant to which the received signal belongs; and based on the calculated Euclidean distance, obtaining log likelihood ratio information through a Log _ Map or Max _ Log _ Map algorithm. According to the non-uniform modulation and demodulation method and system in the wireless broadcast communication system, the medium and the terminal, the complexity of non-uniform modulation and demodulation in the wireless broadcast communication system can be reduced, and no performance loss exists.

The present application provides a signal transmission method, a base station, a terminal, and a communication system, wherein the signal transmission method includes that the base station determinesa transmission period at which the base station transmits a system signal, wherein the system signal is broadcasted by the base station to a plurality of terminals; and the base station transmits thesystem signal according to the transmission period, and transmits a deep coverage signal after transmitting the system signal every other at least one of the transmission periods, wherein the deep coverage signal carries the same broadcast information as the system signal. The method can improve the detection performance of the terminal on the broadcast information and improve the signal coveragedepth.

The invention provides a low complexity demodulation method for a multiple-input multiple-output carrier sequence modulation system. Dimensionality reduction MMSE estimation is used for each activation mode of each subcarrier in a signal subframe, modulation symbol estimation under each activation mode is obtained, and a corresponding complete estimation vector is formed according to the activation mode; the activation mode and the modulation symbol of each subcarrier are obtained through using an MAP criterion, estimation results of subcarriers form a complete signal subframe according to a sequence, and after activation mode detection on the signal subframe and error activation mode correction, a signal subframe with a legal activation mode is demodulated to obtain an information bit. The MMSE criterion is firstly used to estimate the modulation symbol under each activation mode, the MAP criterion is then used to calculate the maximum posteriori probability of different transmissionvectors under each activation mode, and through considering the posteriori probabilities of different transmission vectors, the estimation accuracy of each subcarrier is enhanced, and the error bit performance of the system is improved.

The invention discloses a rateless modulation and demodulation method approaching a capacity limit in a wide-range SNR, and belongs to the technical field of modulation and demodulation in wireless communication. The method comprises the following steps: firstly, a group of constellation points close to Gaussian distribution is fit by using non-uniform interval points with equal probability; secondly, the mapping performance of a constellation diagram is optimized through a BSA algorithm, and a local optimal mapping scheme between information code elements and constellation points is designed; at a sending end, a sparse mapping matrix is used for carrying out random sampling on an information sequence to obtain information code elements, the information code elements are directly modulated to constellation points according to a mapping scheme, and the sampling and mapping times are increased along with the reduction of the channel SNR, so that the adaptive SNR range is expanded; and a receiving end carries out demodulation by adopting a BP iterative algorithm. The method provided by the invention does not need to design a weight set to realize the Gaussian forming of the symbol, can obtain the performance close to the capacity limit in a large-range SNR (Signal to Noise Ratio), and is a modulation and demodulation method with a rate-free characteristic.

The invention provides a target tracking method and device, electronic equipment and a storage medium, and relates to the technical field of target tracking, the method comprises the following steps: a plurality of OTFS integrated signals sent by a vRAN base station are received, the plurality of OTFS integrated signals are coded and modulated in a time delay-Doppler domain, and pilot frequencies are different; demodulating the plurality of OTFS integrated signals based on air calculation, and determining the relationship between the channel information of the plurality of OTFS integrated signals in the time delay-Doppler domain and the pilot frequency; and target movement information is determined based on the relationship between the channel information and the pilot frequency, and the target movement information is used for realizing target tracking based on general inductance calculation integration. According to the invention, low-error and high-precision target tracking can be realized, and the target tracking efficiency is improved through integration of communication, perception and calculation.

The present invention provides a demodulation method, device, terminal, and system, wherein the demodulation method includes: acquiring communication information of a cell, performing blind solution to a synchronization signal in the communication information, and obtaining a blind solution result, The time range information carried in the communication information is determined according to the blind solution result, and the communication information is demodulated according to the time range information. The solution of the present invention can determine some conditions of the communication information of the cell by means of the obtained prior information, thereby reducing assumptions when demodulating the communication information, reducing demodulation complexity, and reducing power consumption.

The invention is suitable for the field of the optical signal transmission, and provides a transmission system of a dual-polarization optical signal. The transmission system comprises a dual-polarization optical signal sending device, a transmission link and a dual-polarization optical signal receiving device connected in order; the dual-polarization optical signal sending device produces a multi-path optical signal with dual-polarization transmission information and sends the optical signal to the transmission link; the transmission link sends the optical signal to the dual-polarization optical signal receiving device through a multi-core optical fiber; the dual-polarization optical signal receiving device demodulates the optical signal to acquire the dual-polarization transmission information. Through the transmission system disclosed by the embodiment of the invention, the dual-polarization optical signal receiving device at a receiving end does not need a local laser and is unnecessary to integrate a coherent receiver, the receiving cost of the dual-polarization optical signal is greatly reduced, and the frequency offset compensation is inexistent since the local laser is not required, and the demodulation complexity of the system is reduced.

A time-domain OFDM synchronization symbol generation and demodulation method, data frame transmission method, wherein the generation method of the time-domain OFDM synchronization symbol includes generating a CAZAC sequence and its shift sequence; forming a frequency domain based on the CAZAC sequence and the shift sequence of the CAZAC sequence OFDM synchronization symbols; perform inverse Fourier transform on frequency domain OFDM synchronization symbols to form time domain OFDM synchronization training symbols; divide time domain OFDM synchronization training symbols into first part symbols and second part symbols, and divide these two parts symbols respectively Multiplied with a fixed frequency offset to form the prefix and suffix of the time-domain OFDM synchronization symbol; the time-domain OFDM synchronization symbol is formed based on the prefix of the time-domain OFDM synchronization symbol, the OFDM synchronization training symbol and the suffix of the time-domain OFDM synchronization symbol. The technical solution reduces the complexity of OFDM symbol generation, reduces the demodulation complexity and improves the demodulation parameter performance.

The invention discloses a low-complexity system structure design method based on a high-order optical DPSK system, and belongs to the technical field of free space optical communication. According to the design, on the basis of a high-order light DPSK demodulation principle, according to corresponding distribution of each bit sequence on a constellation diagram, the most complex bit in the demodulation process is selected for constellation reconstruction, 0 and 1 of the bit are dispersed as much as possible to simplify a demodulation structure, and meanwhile, auxiliary bits are introduced to mark constellation points for transformation, so that the constellation reconstruction efficiency is improved. And the optical signal is transmitted to a receiving end through amplitude modulation, so that the purpose of assisting in demodulating other bits is achieved, and the system structure is further simplified. According to the high-order light DPSK optimization system, the higher the modulation order is, the simplification degree of the optimization system after constellation mapping reconstruction is higher, and therefore the higher the light power of each demodulated branch is, and the high-order light DPSK optimization system can save the laser emission power and has higher energy efficiency.

The invention belongs to the technical field of communication, and discloses a Chirp unequal error modulation method based on a plasma sheath channel, and an aircraft. At the signal transmitting end of the system, three different sequences m(t), n(t) and c are generated. (t), used to modulate the slope adjustment rate of the Chirp signal, carrier frequency and phase respectively; Chirp signal composite modulation; Chirp signal passes through the plasma sheath channel; After the signal passes through the plasma sheath channel, the signal received at the receiving end is respectively Do the fractional Fourier transform of the best order corresponding to the positive and negative slope adjustment, and sample the data at the best focus positions corresponding to different carrier frequencies; demodulate according to the sampled information to obtain the sent message sequence . The invention ensures that important information is sent out preferentially when the spaceship passes through the "black barrier" area. At the same time, compared with the existing FSK transmission scheme, the demodulation complexity is reduced, and the bit error rate is reduced at the same time.

The invention provides a demodulation method, device, terminal and system. The demodulation method includes acquiring communication information of a cell; performing blind resolution on synchronization signals in the communication information and acquiring a blind resolution result; according to the blind resolution result, determining time scope information carried by the communication information; and performing demodulation on the communication information according to the time scope information. According to the scheme provided by the invention, acquired prior information can be utilized in aid for determining specific conditions of the communication information of the cell, so that hypothesis during the demodulation process of the communication information is reduced, demodulation complexity is reduced and power consumption is reduced.

The present invention provides a method, device, system, and storage medium for sending uplink information, wherein the method includes: determining an uplink antenna for sending first uplink information and second uplink information under the same subframe, wherein the The first uplink information includes at least one of the following: uplink sounding reference signal SRS, uplink detection signal, the second uplink information includes at least one of the following: uplink traffic channel signal, uplink control channel signal; use the determined above-mentioned uplink antenna to perform the first Sending processing of the first uplink information and the second uplink information. The present invention at least solves the problem in the related art that the antennas for sending uplink information in the same subframe are inconsistent.

The invention relates to a multi-communication terminal transmit diversity and transmit diversity relay method in wireless communication system, comprising the steps: multiple communication terminals use their respective source transmission channels to transmit signals; signal gathering point receives these signals and makes linear conversion on these signals and uses multiple channels to transmit linear converted signals, where each channel in multiple channels transmits a linear combination of signals transmitted by multiple communication terminals; and at the receiving end, demodulating the signals transmitted by the signal gathering point.

The invention discloses a space-time continuous phase modulation (CPM) signal modulation method and a space-time CPM signal demodulation method. By the space-time CPM signal modulation method for preprocessing a CPM signal before modulation, a receiver can demodulate the received CPM signal in a linear signal demodulation way to reduce the demodulation complexity. Before CPM modulation is performed on a transmission sequence, the preprocessing before the modulation is performed at first, and comprises a segmented mapping step, an intra-segment redundancy addition step, a primary precoding step, an intra-segment redundancy regulation step, a time reversal and negation step, a secondary precoding step, a cyclic prefix addition step, an intra-segment redundancy addition step and a space-time signal formation step. In the methods, a transmitter adds cyclic prefixes to the sequence, and a signal received by the receiver is the cyclic convolution of a transmitted signal and a channel; therefore, when receiving the modulated CPM signal, the receiver can demodulate the CPM signal in the linear signal demodulation way.

The invention discloses a demodulation method and device for a small modulation index continuous phase signal. According to the technical scheme, the demodulation method comprises steps that differential precoding is conducted on an original signal through a continuous phase modulator at a transmitting end; a receiving end sends the received signal to a continuous phase reconstructor, and the continuous phase reconstructor receives the processed signal and smoothes the signal into a continuous phase; the continuous phase signal generator is used for receiving the signals outputted by the continuous phase reconstructor and converting the signals outputted by the continuous phase reconstructor into continuous phase signals with a modulation index of 0.5; and the continuous phase signal withthe modulation index of 0.5 is demodulated by a serial demodulator. The demodulation method mainly aims to solve problems of difficult continuous phase signal synchronization and complex signal demodulation, and is mainly applied to the fields of mobile communication, satellite communication, deep space communication, remote measurement and the like.