30results about How to "Save frequency band resources" patented technology

The present invention provides a method and system for avoiding terminal radio frequency interference. The terminal supports a first mode and a second mode; a first frequency band in the first mode and a second frequency band in the second mode interfere with each other. The method comprises: when the terminal initiates a first service, if the first service is initiated at the first frequency band, querying whether an ongoing second service works in the second frequency band; if the second service works in the second frequency band, setting the first frequency band to a disabled state, and sending to a network side information of the first frequency band set to the disabled state. The above method and system for avoiding terminal radio frequency interference do not require any change on the network side or addition of signaling between the network and the terminal. The radio frequency interference can be avoided by just using related messages in the existing network, and frequency band resources can be saved, thereby improving the utilization rate of the high-frequency band resources.

The present invention provides a wireless ranging and vehicle anti-collision early-warning method and a system. A transmitting terminal transmits an electromagnetic wave at a maximum transmit power. A receiving terminal receives an electromagnetic wave signal sent by the transmitting terminal, calculates the time duration delta t for the signal strength received within one signal period to be larger than or equal to a threshold critical value delta P or the value of a counter, and determines the distance between the receiving terminal and the transmitting terminal according to the time duration delta t or the value of the counter. When the electromagnetic wave signal transmitted by the transmitting terminal meets the monotonicity property of the a transmitting power function within one signal period, the electromagnetic wave signal is radiated at a single frequency. A vehicle with the above receiving terminal is adopted as an original point, and more than two positions of a vehicle with the above transmitting terminal are measured based on the three-point positioning principle. If a straight line between two positions of the vehicle with the above transmitting terminal passes through the safety running range of the vehicle with the above receiving terminal, the distance is gradually reduced. Meanwhile, drivers are notified of conducting the early-warning operation in advance. The hardware circuit of the system is easy to realize, and low in hardware cost. Meanwhile, the problem of time synchronization between the transmitting terminal and the receiving terminal, and the influence of electromagnetic wave speeds are not considered. The measurement error is very small.

The invention relates to a double-synchronous underwater cooperative target tracking and positioning method, which includes a sea surface hydroacoustic buoy measurement array and a measurement mother ship. The positioning is completed through the following steps: deploying the sea surface hydroacoustic buoy measurement array; underwater targets sending out double synchronous cooperative acoustic signals ;The measurement mother ship receives the return data of the sea surface hydroacoustic buoy measurement array through the erected antenna, and completes the matching of the target delay period, the combined solution of the target position, and the solution of the spherical equations through the base station composed of the main control computer and the shipboard integrated processor The method can effectively reduce the frequency band resources required for multi-target underwater tracking and positioning, and reduce the If the small positioning system conflicts or interferes with the frequency bands used by other installed equipment, it can reduce the risk of engineering practice; save design costs; effectively reduce the amount of calculation, effectively reduce the power consumption of hardware circuits, and reduce the volume of installed equipment.

The invention relates to a two-way ranging and time comparison processing terminal which is characterized in that: the processing terminal comprises a frequency benchmark, a radio frequency front end, a noise source, a frequency synthesis, a transmitting channel, a receiving channel, a medium frequency signal processor, a machine case, a display and control system, a power source distributor and a LAN switching module, wherein the configuration of the entire processing terminal is a 4U machine case postnotal plate joint interconnecting structure fastened by a standard machine cabinet; the frequency benchmark, the transmitting channel, the receiving channel, the medium frequency signal processor and the power source distributor are arranged inside a standard 4U machine case; the display and control system, which is realized through the configuration of an external notebook computer and display and control software, is in interaction with the outside through the LAN switching module. The entire processing terminal has simple equipment and high integration level; communication, ranging and time comparison are completed inside a unified channel, thereby saving frequency band resource;a pseudo code ranging system is adopted to ensure high ranging precision; moreover, the processing terminal, which has the functions of simulating dynamic state and time delay inside the transmittingchannel, is used to realize the quantitative detection of the performance of a receiving terminal.

The present invention discloses a method for eliminating interference between base stations in the mobile communication system and its correspondent mobile communication system. The method includes the following steps: when the downward data is sent to any base station being in base station system, utilizing wired chain link to transfer the transmitted data information into adjacent base station; and when the up ward data is received, receiving and buffer storing wired chain link data information, according to said information producing wireless base band signals for interfering emission of base station, and utilizing these wireless base band signals and radio-demodulated antenna to receive total wireless base band signal, estimating channel parameter between every interference base station and local base station.

The invention provides a frequency offset correction method and device for satellite communication, and relates to the technical field of satellite communication, and the method comprises the steps: obtaining a target data packet; calculating a normalized frequency offset value of the target data packet based on the maximum absolute value soft output value function; carrying out repeated iterativeoptimization on the target data packet, and obtaining a corrected data packet and an iterative frequency offset value after each optimization until the optimization frequency of carrying out iterative optimization on the target data packet reaches a preset iteration frequency or the iterative frequency offset value is 0; and determining the correction data packet obtained by performing iterativeoptimization on the target data packet when the optimization frequency reaches the preset iteration frequency, or determining the correction data packet when the iterative frequency offset value is 0as the optimal data packet, thereby solving the technical problem of relatively high frequency band resources occupied by satellite communication for estimating the frequency offset in the prior art.

The present invention relates to a sub-band filter generation method based on sub-band filter OFDM system, comprising the following steps: designing a linear phase filter that satisfies the passband edge of the target frequency response and rolls off from 1 to the roll-off cut-off amplitude δ, and can be obtained by The roll-off band factor controls its pass-band edge roll-off cut-off amplitude δ and roll-off band width; the roll-off function of the linear phase filter is taken as a raised cosine function; the window function is selected; the selected window function is compared to the designed linear The phase filter performs soft truncation to generate subband filters. The sub-band filter designed by the invention has larger stop-band attenuation, smaller pass-band ripple coefficient, smaller time-domain impulse response tail and narrower transition band.

The invention discloses a flexible optical interconnection method for adjusting the top of the optical mark, which includes, according to the existing optical transmission network path planning, encoding and modulating the routing switching node information, granularity information, modulation format information and redundant information, and the service channel The payload of the network is transmitted together to improve the operating efficiency of the optical network; the above-mentioned information is encoded, digital-to-analog converted, and mixed-modulated to add the information to the service channel; this part of the information needs to be transmitted without affecting the original payload. Through signal reception and demodulation, information is obtained at network nodes; thus, service identification, service tracking, and path planning are realized in the optical network, effectively reducing the complexity of the optical transport network; at the same time, the encoding process, modulation process, channel Redundancy and other aspects are optimized to effectively improve spectrum efficiency on the basis of the above requirements.

The invention discloses a Mach-Zehnder-modulator-based odd sideband suppression ROF system comprising a wavelength division multiplexing demultiplexer, a wavelength division multiplexer, a single-modefiber, an erbium-doped fiber amplifier, and a first filter processing module and a second filter processing module. The first filter processing module includes a first Bessel filter, a first opticalcoherent DP PSK receiver, a first general digital signal processor, a first determiner, a first PSK sequence decoder and a first parallel-to-serial converter; and the second filter processing module includes a second Bessel filter, a second optical coherent DP PSK receiver, a second general digital signal processor, a second determiner, a second PSK sequence decoder and a second parallel-to-serialconverter.

The invention discloses a simultaneous and same-frequency full-duplex measurement and control transponder, which includes a passive self-interference cancellation module, a radio frequency self-interference cancellation module, a transceiver channel and a digital signal processing module; the passive self-interference cancellation module utilizes space signal attenuation or device isolation mode Realize the attenuation of the self-interference signal entering the receiver, the radio frequency self-interference cancellation module uses the LMS algorithm or the RLS algorithm to realize the secondary cancellation of the self-interference signal in the analog domain; the transmission channel of the transceiver channel module realizes the modulated digital signal Digital-to-analog conversion, filtering, up-conversion and power amplification functions, the receiving channel realizes the functions of filtering, down-conversion, automatic gain control and analog-to-digital conversion of the received signal; the digital signal processing module realizes digital processing of signals in the digital domain, including Functions such as digital up-down conversion, digital modulation and demodulation, filtering and digital self-interference cancellation. The invention achieves the purpose of saving frequency band resources.

The invention discloses a terminal access method and system. The method includes: determining a frequency band demand table of the terminal according to the remaining power of the terminal, the frequency band demand table including the frequency band expected to be connected by the terminal; sending a first broadcast message to the block chain In the network, the first broadcast message includes a frequency band requirement list and an identification of the terminal; in response to the frequency band allocation message sent by the base station, use the working frequency band carried in the frequency band allocation message to access the wireless network provided by the base station, and the working frequency band is the base station according to the frequency band The frequency band identified by the requirements table. Determine the frequency band demand table of the terminal through the remaining power of the terminal, and send the frequency band demand table to the blockchain network, so that each base station in the blockchain network can know the terminal's demand for the frequency band; The frequency band requirement table allocates a suitable working frequency band for the terminal, so that the terminal can access the wireless network through the working frequency band, which meets the individual needs of the terminal and saves the frequency band resources of the base station.

The invention discloses an acentric distributed rapid consensus method for an Ad Hoc unidirectional link network. Non-gateway nodes in the whole network are distributed in a nonredundant manner to each gateway node in a communicated predomination and absorption set to serve as independent neighbor nodes of the gateway nodes, distributed consensus computation of a network node state value is performed with the aid of the communicated predomination and absorption set, and a final consensus result is shared to the whole network; and rapid convergence of the distributed consensus result is achieved. According to the method provided by the invention, the convergence result is accurate and stable, and the network does not need the central node. The purpose of stable convergence and small computing complexity can be achieved via a turn of computation, and the problems that in a traditional acentric distributed rapid iterative algorithm, the number of iterations cannot be determined, the node interaction communication traffic is large, and the convergence result is instable or cannot be converged to an accurate value are solved, so that the method provided by the invention is capable of saving node energy consumption, reduced in communication traffic and node computation burden, prolonged in service life of the network, effectively reduced in network delay and good in instantaneity.

The invention discloses a two-way voice signal simultaneous interpretation transceiver. The voice signal output by a microphone at the analog sending end is digitally up-converted by a signal intelligent control module, and then transmitted to the mixing module together with the voice signal of another microphone. , the output of the mixing is sent to the signal intelligent control module for A / D acquisition and controls the output of the DDS program-controlled signal source module. The output analog signal is sent by the medium power amplifier connected to the antenna; the analog receiving end receives the signal through the antenna after filtering and analog signal frequency multiplication The module adjusts the carrier frequency, then connects to the amplifier circuit module for amplification, and transmits it to the phase-locked loop module for demodulation, and the output is respectively connected to two filters. After filtering, the voice signal with a lower center frequency is directly sounded through the speaker, and the other signal is transmitted Perform digital down-conversion to the signal intelligent control module and then drive the speaker to produce sound.

A joint semi-blind channel estimation and data detection method based on superimposed pilots, which is characterized in that firstly at the transmitting end, the useful symbols are superimposed on the pilot symbols known at the receiving end and then sent to the channel, and then at the receiving end, each sub- The frequency domain correlation between the carrier frequency domain channels, the frequency domain channel is equivalent to a finite state machine; then, use the maximum likelihood criterion detector to detect useful symbols, use the detected useful symbols to perform LS channel estimation, and update the channel state machine to detect the next useful symbol.