153results about How to "Save Spectrum Resources" patented technology

The invention provides a method to realize the key security inosculating mobile multimedia broadcasting system that includes: (a) the generation and storage of the broadcasting system network, and refresh the key of program, the generation of mobile communication system network, storage and refresh the business key, and the business key and label are transmitted to the user terminal by the mobile communication system network; (b) the program key is transmitted to the business platform of mobile communication system network by the broadcasting system network, the key is secreted by the business platform, and the secreted control information is returned; (c) the scrambler of broadcasting system network uses the program flow corresponding to the encrypted code, the program flow and the cipher key information are sent by the radio; (d) the user terminal receives the program flow and secreted control information to find the corresponding business key label, and the business key is the parameter, decipher the key of program flow, and decipher the program flow data using the obtained key of program flow.

The embodiment of the invention provides a method and equipment for data transmission in a wireless local area network. The method comprises the steps of generating a PLCP protocol data unit (PPDU), wherein the bandwidth of a channel bearing the PPDU is less than 20MHZ, the PPDU comprises M high-efficiency short training fields (HE-STFs) and a data field and does not comprises a legacy-short training field (L-STF) with a backward compatibility function, a legacy-long training field with the backward compatibility function or a legacy-signal (L-SIG) with the backward compatibility function; and sending the PPDU. The PPDU in the embodiment of the invention does not comprises the L-STF with the backward compatibility function, the L-LTF with the backward compatibility function or the L-SIG with the backward compatibility function, and the bit of the PPDU is reduced, thereby saving spectrum resources used for transmitting the PPDU, and improving the spectrum utilization ratio.

The invention discloses a transmission method for broadcast / multicast feedback signaling, which comprises an uplink resource allocation process, a feedback signal generating process and a feedback signal sending process. The uplink resource allocation process is that all the child nodes which probably feed back to the same parent node allocate the same time frequency resource so as to support that transmission of the feedback signaling. In the feedback signal sending process, each child node checks first whether the locally received broadcast / multicast data packet is right or not; if an erroris found and cannot be corrected, an NAK signaling is sent at a given time frequency position corresponding to the data packet in the uplink resource allocation process. The broadcast / multicast feedback signal transmission method provides a method for multiplexing a plurality of feedback signals at the same time frequency position to make the spending of the broadcast / multicast feedback signal independent of the number of feedback nodes to save frequency spectrum resources and expand an effective application range of a feedback mechanism in a broadcast / multicast communication.

The invention relates to a method and a system for receiving digital broadcasting signals in frequency modulation (FM) broadcast bands. The method comprises the following steps of: receiving digital / analog (D / A) mixed signals x (t); preliminarily separating to acquire preliminarily recovered analog FM signals x0FM (t) and digital FM signals d0 (t); performing first level pilot frequency-based iterative separation on the signals to acquire digital and analog FM signals after the first level iterative separation; and performing second level iterative separation by means of pilot frequency and internal codes, wherein the digital FM signals after the iterative separation acquire digital audio signals and data signals through channel decoding, and the analog FM signals acquire analog audio signals through demodulation and D / A conversion. A digital FM signal demodulation decoder of the system comprises a preliminary FM separator, an iterative FM separator, and a synchronization recovery and channel equalizer and a decoding module, and the iterative offset separation of the analog master FM from digital signals is realized. According to the method and the system, the mixed D / A signals overlapped by the same channel are separated, the mutual interference of the signals is eliminated, and the FM band digital broadcasting system can be realized.

The invention discloses a wireless information and power transfer system maximum safety rate optimization method based on NOMA; the method comprises the following steps: firstly, a wireless information and power transfer system based on the NOMA is provided, the system is provided with a cell base station BS, M information receivers IRs and K energy receivers ERs, wherein the ER obtains energy from a radio frequency signal transmitted by the BS and eavesdrops on the information sent by the BS to the IR; according to the principle of the NOMA technology, the information transmitted by the BS tothe IR transmits a signal through a superposition coding technology, and the expression is as follows: formula; in the formula, am is the signal transmission power distribution coefficient of the mthIR, P is the signal transmission total power of the BS, xm is the confidential information of the mth IR, and sigma 2 is the additive gaussian white noise; and an optimization parameter AM is adjusted according to the method, certain energy can be provided for the ER, and a certain information rate is provided for the IR; and the purpose of providing the maximum safety information rate is provided for the IR in the case of the ER eavesdropping on information.

The disclosed digital visible walkie-talkie applied 2.4G public frequency band comprises: a power circuit, a speech process circuit with a microphone and loudspeaker and a speech coding / decoding circuit, a video process circuit included a display device and a COMS camera both connected with CPU, a CPU, a RF transmitting-receiving circuit with a 2.4G frequency band transmitting-receiving chip and peripheral circuit to connect with CPU, and an antenna. This invention can transfer both speech and video information simultaneously for high quality multimedia effect with low cost, and fit to spread in large scale.

The invention discloses a method and equipment for transmitting digital-analog audio broadcasting. In the method, an analog audio broadcasting signal and a digital audio broadcasting signal are synthesized into an analog and digital mixed-signal to share an analog audio broadcasting channel; or the analog audio broadcasting signal and the digital audio broadcasting signal are synthesized into the analog and digital mixed-signal to share the analog audio broadcasting channel, and the digital audio broadcasting signal also uses frequency bands which are adjacent to the shared channel of the analog audio broadcasting signal and the digital audio broadcasting signal. The power of the digital audio broadcasting signal is at least lower than the power 25dBc of the analog audio broadcasting signal. The bandwidth of the shared channel is 180 to 220 kHz. The adjacent frequency bands of the shared channel are the upper sideband and the lower sideband adjacent to the shared channel. The input ends of an analog audio modulation module and an digital audio modulation module are connected to an external audio source or a data source; the output ends are connected to a synthesis module for synthesizing the analog audio broadcasting signal and the digital audio broadcasting signal into the mixed signal; and the mixed signal is amplified by an amplifier and is transmitted by an antenna feedback system. By the method and the equipment, audio resources are saved and the frequency band using modes are flexible and varied.

The invention relates to a generation method and transmitting equipment for in band on channel (IBOC) digital / analog audio broadcast signals. The method comprises the following steps of: generating analog sound broadcast signals of time discrete; generating digital signals, and copying the digital signals in an adjacent signal frame; adding and subtracting the analog sound broadcast signals *2m, *2m + 1 and the corresponding digital broadcast signals in the adjacent signal frame, and acquiring *2m-dm and *2m + 1 + dm; and emitting acquired digital / analog mixed signals in the same broadcast channel. The transmitting equipment comprises an analog sound modulation module, a digital signal modulation module, a mixing module, a digital / analog converter, an upconversion module, a power amplifier and an antenna feeder system, wherein the mixing module comprises an adder and a subtractor so as to acquire the digital / analog mixed signals. According to the method and the equipment, analog / digital mixed signals with completely overlapped frequency spectrums are acquired, frequency bands are saved, and that a receiving end completely separates the digital / analog signals is facilitated.

Present invention discloses semi-blind channel estimation method in MIMO -OFDM system. It contains replacing original OFDM circulate prefixion to training sign to estimate channel. Transmitted-data is divided into training sign and data transmission OFDM sign, wherein training sign constituting fine self-correlation and poor cross-correlation sequence for substituting circulate prefixion, resisting ISI and ICI and establishing channel estimated initial parameter, data transmission OFDM sign composed of data sign channel estimate algorithm adopting Wiener's algorithm. Said invention has higher frequency spectrum efficiency and data-signalling rate and lower operating complexity.

The embodiment of the invention discloses a hierarchical modulated data transmitting and receiving method and a device thereof; wherein the hierarchical modulation signal transmitting method includes the following steps: receiving the base-hierarchy data and the reinforced-hierarchy data formed after hierarchical modulation by a base station from a base station; picking up the reinforced-hierarchy data from the base-hierarchy data and the reinforced-hierarchy data formed after the hierarchical modulation by the base station; and sending the picked reinforced-hierarchy data to a terminal. The terminal far from the base station within the coverage of the base station receives the reinforced-hierarchy data formed after the hierarchical modulation by the base station from a relay station, and receives base-hierarchy data formed after the hierarchical modulation by the base station from the base station. Therefore, the hierarchical modulation signal transmitting and receiving method and the device can realize that the terminal far from the base station within the coverage of the base station can receive the base-hierarchy data and the reinforced-hierarchy data formed after the hierarchical modulation by the base station from the base station at the same time while saving frequency spectrum resources.

The invention discloses a method and a device for identifying the frequency domain amplitude characteristic of a control object. The method comprises the following steps of: adding a frequency spectrum identification signal into an input signal of a regulating loop which consists of a regulator and the control object; filtering an output signal of the regulator, and acquiring a reference frequency signal; filtering the output signal of the control object which is connected with an output end of the regulator, and acquiring a process frequency signal; and comparing the amplitude of the reference frequency signal with the amplitude of the process frequency signal, and acquiring the frequency domain transfer amplitude coefficients of the control object. By the invention, the frequency domain amplitude characteristic of the control object can be identified in a frequency spectrum resource saving mode, not all continuous frequency spectrum resources of a thermo-technical object are required to be used, a limited number of non-continuous single-frequency point frequency spectra are required to be used, single-frequency point frequency spectrum signals are filtered by using a filter, and a majority of interference signals are eliminated.

The invention relates to a method for selecting address of base station in multiple system, considering co-channel spuious interference, the method includes: obtaining radio-frequency performance parameters of network base stations (31,41,42) and a terminal device (32) in each system; determining the maximum and minimum distance of the network base stations (31,41,42) and a district (2) with near-far effect in each system; selecting addresses of network base stations in each system from the optional range besides the maximum (23) and the minimum (21) distance. Comparing with tradtional method, the method can not need network at 1:1, networks more neatly, reduces networking cost greatly, does not need to increase frequency interval to reduce near-far effect, saves frequency spectum resource. Comparing with existing patent, the invention has different analysis, has wider range of application, which is useful for analyzing and solving near-far effect interference between networks or internal of network in same frequency band for CDMA, WCDMA, TD-SCDMA with fixing carrier frequency.

The invention relates to an ultra low loss optical fiber replacement scheduling method and system in a backbone network for improving the spectrum utilization efficiency of an operator. The method provided by the invention comprises the following steps: S1 calculating gains after the replacement of optical fiber links, that is, calculating remaining times of reduced frequency slot FS after the replacement of the optical fiber links to complete replacement of the rest optical fiber links; S2, selecting the optical fiber link with the highest gain after the replacement of one optical fiber linkfor replacement; and repeating S1 to S2 until all optical fiber links needing to be replaced are completely replaced. According to the ultra low loss optical fiber replacement scheduling method and system, by determining the most reasonable optical fiber replacement sequence, the spectrum resources are saved for the operators as much as possible for additional service use.

The invention discloses a latent communication system and method based on a non-cooperative blind source. The latent communication system comprises an information coding and transmitting end, an information receiving and demodulating end and a non-cooperative blind source signal, a non-cooperative blind source is used as a communication carrier wave, double antennas or multiple antennas are used as receiving ends, received electromagnetic waves are demodulated in a receiver, and therefore hidden transmission and passive transmission communication of information are achieved. By adopting the technical scheme of the invention, a signal emission source is not needed, the carrier emission power is saved, and new spectrum resources are not occupied; the circuit structure is simplified, and thehardware cost is reduced; concealed communication is guaranteed in the physical level, and indoor directional fixed-point communication can be achieved. Information can be sent to a sensor at a specific position in the Internet of Things, energy is provided for the radio frequency identification tag, and the wireless communication quality is improved.

The invention discloses a zero-forcing and Taylor series expansion fused double-layer precoding design in a large-scale MIMO (Multiple Input Multiple Output) system and belongs to the technical field of wireless communication. A specific design process is as follows that a user obtains a downlink channel state information estimation value through a received pilot sequence and feeds back the CSI (Channel State Information) estimation value to a base station through a feedback link; a base station only needs to design an outer layer precoding matrix in a Taylor series expansion mode through utilization of channel statistic information, thereby eliminating inter-group inter-user interference; a practical channel and the outer layer precoding matrix are regarded as equivalent channels; and the base station designs an inner layer precoding matrix based on the equivalent channels through utilization of a zero-forcing technology, thereby eliminating intra-group IUI (Inter-User Interference). According to the design, the interference is eliminated, the performance of the system is improved, the channel estimation complexity is reduced, correspondingly, the information feedback volume of the CSI is reduced, and spectrum resources are saved.

The invention discloses a multi-antenna data transmission method based on graded service, and a system and a device thereof. The graded transmission is realized through the graded MIMO design, a relay station equipped by multiple antennas can be utilized for transferring enhanced layer data to coverage range edge users by graded MIMO or simultaneously transferring two-layer data of both the basiclayer and the enhanced layer, and the high-quality receiving of the edge users can be realized.

The invention provides a CCFD-Massive MIMO system power distribution method based on quantum backtracking search optimization. The CCFD-Massive MIMO system power distribution method based on quantum backtracking search optimization comprises the steps of: establishing a system model; initializing a quantum population and system parameters, so that mapping modes of quantum individuals are obtainedthrough a mapping rule; calculating adaptive values of the quantum individuals, and taking the quantum individual, the adaptive value of which is the maximum in the quantum population, as the globallyoptimal solution; generating new quantum individuals through evolution and crossover strategies; obtaining mapping modes of the new quantum individuals according to the mapping rule, calculating adaptive values, and updating the quantum population and the globally optimal solution through greedy selection; if the iteration time is less than the pre-set maximum iteration time, returning to the fourth step; and otherwise, ending iteration, and outputting the globally optimal solution, so that an optimal power distribution scheme is obtained. According to the CCFD-Massive MIMO system power distribution method based on quantum backtracking search optimization provided by the invention, the spectrum utilization rate is effectively increased; self-interference and mutual interference of base stations and users are sufficiently considered; the secrecy capacity of a system is increased to a great extent; and a new solution is provided for the power distribution problem of a complex system.

The invention discloses a method for implementing a bandwidth-asymmetrical system, which specifically comprises the following steps that: in an uplink limited spectral range, an evolved node B schedules a physical uplink shared channel and configures a physical random access channel; user equipment initiates random access according to the configuration of the physical random access channel and establishes radio resource control (RRC) connection with the evolved node B; the evolved node B semi-persistently schedules the user equipment; and the user equipment carries uplink control information by the physical uplink shared channel in a semi-persistently scheduled state. The invention also relates to a device for implementing the bandwidth-asymmetrical system. In the method and the device, all the uplink control information except a schedule request (SR) is carried by the physical uplink shared channel, so that a physical uplink control channel (PUCCH) processing module is not required in the processing of an uplink physical layer in the system, an uplink system bandwidth is ensured to be less than or equal to a downlink system bandwidth, and the design of the system with the asymmetrical uplink and downlink bandwidths is finished in a conventional frequency division duplex (FDD) protocol frame.

The embodiment of the invention discloses a method and a system for device-to-device communication on a wireless local area network frequency band. The method comprises the following steps: a base station receives a D2D communication request message reported by a first mobile terminal, determines the configuration information of a WiFi module for processing a communication service on the WLAN frequency band according to the WiFi module information of the first mobile terminal and a second mobile terminal while determining that the communication service between the first mobile terminal and the second mobile terminal is processed on the WLAN frequency band, indicates one of the first mobile terminal and the second mobile terminal to initiate an IBSS on the basis of the configuration information of the WiFi module, and notifies the other mobile terminal to join the IBSS, so that the first mobile terminal and the second mobile terminal establish WiFi connection and process the communication service on the WLAN frequency band through D2D communication according to the configuration information of the WiFi module. The method and the system disclosed by the embodiment of the invention are capable of avoiding occupying the authorized frequency bands of the traditional cellular network, and generating interference on the traditional cellular communication service.

The invention provides a method and a system for realizing cell search and downlink synchronization. The method includes the steps of dividing sub-bands of frequency spectrum of a communication system into a plurality of clusters, setting the sub-band at the center of each cluster as a cell searching sub-band and the other sub-bands in the cluster as normal sub-bands; dividing a synchronizing signal into a plurality of sub-sections; adding the sub-sections and a physical broadcast (PBCH) channel in the cell searching sub-bands according to a smaller period, and adding the sub-sections in the normal sub-bands according to a larger period; and adding other downlink data in normal sub-bands of the frequency spectrum of the communication system and transmitting sub-band information. While cell search and downlink synchronization are realized, frequency spectrum source can be saved.

The invention discloses a nonparametric estimation independent component analysis (ICA)-based multiple input multiple output-orthogonal frequency division multiplexing (MIMO-OFDM) system blind deconvolution method. The method comprises the following steps of: combining nonparametric estimation ICA and MIMO-OFDM; arranging a signal preprocessing module at a transmitting end of the MIMO-OFDM system to perform non-redundant linear precoding on a frequency domain signal mapped to a subcarrier so as to eliminate fuzziness of an independent component analysis algorithm in reconstructed signal sorting and energy; and arranging a nonparametric ICA module at a receiving end of the system to perform channel estimation so as to restore a source signal. By the method, frequency spectrum resource is saved, the amount of calculation is reduced, the operational speed is increased and a time-varying channel can be estimated well.

The invention provides an electronic tag applied to Internet of things and a system using the same. The electronic tag at least comprises an information acquisition module and a first wireless transceiving module, wherein the information acquisition module is used for acquiring dynamic attribute information of a tag attachment; and the first wireless transceiving module is used for receiving radio wave energy and sending the dynamic attribute information acquired by the information acquisition module according to the trigger of the radio wave energy. The system comprises the electronic tag and reading equipment, wherein the reading equipment is used for sending the radio wave energy to the electronic tag and receiving the dynamic attribute information sent by the electronic tag. The electronic tag can store the dynamic attribute information acquired by a sensor besides static attribute information such as weight of articles (commodity), manufacturer, manufacture data and the like.

The invention discloses a method for realizing multi-user spread spectrum communication. The method comprises the steps of S1, performing direct sequence spread spectrum modulation on multi-user information by adopting multiple different mutually-orthogonal PN sequence codes through a sending end, and changing the duty cycle of digital signals after the spread spectrum modulation of different users; S2, converting the digital signal subjected to the spread spectrum modulation into optical signals by an ultraviolet light source, and sending the optical signals to a receiving end by ultraviolet carriers; S3, converting the received optical signals into analog electric signals by the receiving end, and converting the analog electric signals into digital electric signals; and S4, performing average value filtering on the digital electric signals, recovering the signal duty cycle, performing direct sequence despreading and judging the user of the received user information. The invention also discloses a system for multi-user spread spectrum communication. The method for realizing multi-user spread spectrum communication can greatly improve the multi-user communication quality, has strong confidentiality and antijamming performance, and realizes the high integration of the multi-user spread spectrum communication.

The invention discloses a multi-relay and multi-antenna-based cognitive wireless sensor network performance optimization method. According to the method, a cognitive wireless sensor network system model with multiple antennas and multiple relays is adopted; multi-relay cooperative cognition, relay selection and beamforming technologies are adopted, and therefore, the throughput of a cognitive wireless sensor network system can be improved, and at the same time, the interruption probability of the system can be decreased. With the method adopted, the accuracy of sensing results of the cognitive wireless sensor network system and high spectrum utilization rate can be ensured, the throughput of the whole system can be reduced, and at the same time, the interruption probability of the overall system can be reduced.

The invention discloses a circuit switched (CS) domain based system and method for transmitting GSM-R (Global System for Mobile Communication-Railway) train control data in real time. The system comprises a distributed antenna array, a network-side BTS (Base Transceiver System) and a train locomotive terminal; wherein the distributed antenna array is erected along the railway and used for providing signals of the same fixed frequency for the train locomotive terminal so as to ensure that a CS domain data transmission link of the train locomotive terminal is always in a connection state; the network side BTS is connected with distributed antennae in a wired manner and used for controlling the on / off states of the antennae so as to realize a network side switch function; and the train locomotive terminal is connected with the network side BTS through a wireless transmission link. The invention changes the traditional GSM-R handover strategy to ensure that a train always runs in a cell with a fixed frequency; and a handover function is controlled by one network side BTS so that a ping-pong handover phenomenon is eliminated and the communication stability and the safety reliability ofthe train are obviously enhanced.

The invention discloses a reconfigurable two-dimensional optical encoder based on a photo-switch and a light reflector and an encoding method. The encoder comprises a broadband light source, a wavelength selecting and routing controller, a three-port optical circulator, (a) 1*M arrayed-waveguide optical grid (s), M*N photo switches and (N-1) optical fiber Sagnac ring mirrors with different delay quantities, wherein N-1 optical fiber Sagnac ring mirrors can also be replaced with (N-1) optical fiber lines and (N-1) light reflection mirrors with different delay quantities for realizing the same function. The encoder is capable of quickly and effectively realizing the encoding function of the detection pulse; the codon capacity can be increased by fully using the wavelength and the two-dimensional information of time; the network is better in expandability; the number of the user wavelengths is relatively reduced; the pectrum resource is saved; the encoder can be used for meeting the requirements of simple structure, low cost and easy to realize.

The invention discloses a controlled object frequency domain phase characteristic identification method and an apparatus thereof. The method comprises the following steps: adding a frequency spectrum identification signal into an input signal of a regulation loop which is formed by an regulator and the controlled object; filtering an output signal of the regulator and acquiring a reference frequency signal; filtering the output signal of the controlled object which is connected with an output terminal of the regulator and acquiring a process frequency signal; comparing a phase of the reference frequency signal with the phase of the process frequency signal and acquiring a controlled object frequency domain transmission phase value. Through using the method and the apparatus of the invention, frequency spectrum resources can be saved and the frequency domain phase characteristic of the controlled object can be identified. All the continuous frequency spectrum resources of a thermal object are not needed. A limited quantity of non-continuous single frequency point spectrums are only needed. Through using a filter to filter the single frequency point frequency spectrum signal, most of the interference signals can be eliminated.

The invention provides a dynamic anti-interference receiver device comprising a wave-limiting filter, a first-stage low-noise amplifier, a second-stage low-noise amplifier, an adjustable attenuator, a mixer, an intermediate-frequency filter, an intermediate-frequency amplifier, an analog-to-digital converter. The wave-limiting filter is arranged in front of the first-stage low-noise amplifier and is used for inhibiting signals from other communication systems; the adjustable attenuator arranged between the first-stage low-noise amplifier and the second-stage low-noise amplifier is used for reducing the front-end gain of the receiver device; and the intermediate-frequency filter arranged between the mixer and the intermediate-frequency amplifier is used for inhibiting the interference. With the device, a co-station and a co-address effect of wireless systems of adjacent frequency bands can be realized; and the frequency resources can be fully utilized and saved.

The invention provides a differential modulation and demodulation method applied to a spatial modulation system. According to the differential modulation and demodulation method provided by the invention, extension is performed on an emission modulation space of the traditional spatial modulation technology. By adopting the differential modulation and demodulation method provided by the invention, sending end modulation and receiving end demodulation can be performed without knowing channel state information, and therefore, channel estimation can be avoided, and the complexity of a receiver is reduced. Meanwhile, pilot frequency interpolation is avoided, so that a spectrum resource can be saved. Moreover, the differential modulation and demodulation method applied to the spatial modulation system is suitable for a high-speed mobile scene of which the channel response change is fast.