64results about How to "Save frequency resources" patented technology

The utility model provides a interference clearance technique, so that the up-down-going link of the wireless communication can run via the same frequency and the time-slot, so as to improve the rate of spectrum utilization. When the up-down-going channel is under the common frequency and the time-slot, the down link will interfere the up-link, namely, the base station receiver in the sub-zone is interfered by the base station transmitter of the sub-zone and the base station transmitter of the adjoining sub-zone. The utility model delivers the undesired signals to the receiver through the wired communication. The receiver is arranged with a signal preprocessing unit, so as to remove the transmitter signal interference in the radio frequency. Such signal interference is from the air interface. In addition, the utility model provides an aerial distribution rule to reduce the direct interference of the transmitter to the receiver. The interference clearance method is suitable to the duplex system with the common frequency and time-slot, so as to greatly reduce the frequency resources and time resources.

The present invention discloses a community users communication method based on the orthogonal frequency division multiplexing, including carrying out the grouping handling to users in each community in the orthogonal frequency division multiplexing mobile communication system; and making different groups users in the community occupy different time domain symbol resources to process the communication data transmission. Accordingly the present invention also discloses a community users communication system based on the orthogonal frequency division multiplexing. The present invention can reduce interference between users in one community and interference between communities in the mobile communication system.

The transmitting procedure includes steps: reproducing data stream modulated through BPSK from user so as to form parallel data stream identical in P routes; carrying out spread spectrum in frequency domain for reproduced parallel data stream in P routes, taking symbol period of transmission as integral multiple of í«Qiepuí» period; inverse FFT is carried out for parallel signal in P routes after spread spectrum; transmitting added modulated sub carrier signals in P routes. The receiving procedure includes steps: FFT is carried out for signal received from antenna to recover signals of each sub carrier; carrying out de-spread and matched filtering processes for signals in each path, each sub carrier and each user so as to obtain de-spread signal; uniting multipath signal in time domain so as to obtain signal of united each sub carrier in multipath; after combination in frequency domain obtains final judging variable; BPSK modulating the judging variable to recover userí»s data stream.

The invention relates to a high-power intelligent synthesis system which is an important component of a necessary system for an N+1 television transmitting system. The creative system is used to support transmitting systems of multiple digital television transmitters with the power of 500W or above and undertake radio frequency (RF) power synthesis, namely a passive synthesis system. Under the control of a computer, the system provided by the invention intelligently sends the N+1 channels of RF power signals output by the N+1 transmitters (usually N is a positive integer less than or equal to eight), wherein N channels of RF power signals are sent to a filter group and one channel of RF power signals is sent to a load. The out-of-band clutters in the N channels of RF power signals are filtered out by the filter group and then synthesized, output and sent to an antenna feed system for users to receive. The N+1 RF high-power intelligent synthesis system comprises management software (platform), an exchanger, a synthesizer group, a band-pass filter group, an intelligent coaxial switch group and a load of the system. The characteristics of the system provided by the invention lie in that high-power RF synthesis can make multiple transmitters to share the same antenna feed system, and the system operate with low consumption (high efficiency) in a full adjacent frequency and intelligent (controlled by a computer) mode, and can realize an N+1switching function.

This invention discloses a block position management method based on the next generation mixed mobile network communication divided into two modes of horizontal and vertical communications, which takes several mobile stations close to each other and with the same moving trend in the mobile communication network as a grouped set to be managed unifiedly including: 1, a new mixed communication mode: vertical and horizontal, 2, four kinds of new network elements: multiple radio mobile terminals, a grouped set, a group head and a blocked position database, 3, the blocked position renewing method: setting up a grouped set, which is registered initially, renewing the members and renewing the grouped set, 4, a related call transfer method.

The invention discloses a method for selecting different handsets in a telephone set which comprises, the mobile phone system receiving a calling signal and transmitting it to the DECT system, activating a directing mechanism according to the incoming signal, the guiding mechanism prompting the caller to input the subset identification signal, lastly switching on to corresponding subset based on the inputted subset identification signal.

The invention discloses a method for achieving frequency modulation emergency broadcast based on RDS. The method comprises the following steps that firstly, basic tuning and switching information frames, emergency broadcast data frames and broadcast text frames are combined into a data package to be sent out at regular intervals through the emitting station; secondly, when a receiving terminal receives the data package sent by the emitting station, whether the emitting station supports emergency broadcast and plays the emergency broadcast or not is recognized according to the basic tuning and switching information frames, if the emitting station supports the emergency broadcast and plays the emergency broadcast, the third step is carried out, and otherwise, the next data package is waited to be received and processed; thirdly, when the receiving terminal judges that the receiving terminal is a matched receiving terminal according to the emergency data frames, the emergency broadcast is received and played. The frequency modulation emergency broadcast data information is transmitted based on the RDS technology, the frequency resources are saved, the anti-interference ability of the signal is strong, and users can receive the emergency broadcast information in time.

A method for half duplex digital communication relay with same frequency dual time slot comprises a transmitting terminal A and a receiving terminal B communicating at least in the same frequency, a transmitting terminal C and a receiving terminal D, a base station, a transmitting terminal A and a transmitting terminal C applying for an idle time slot and alternately transmitting a first radio signal and a second radio signal; When the receiving terminal B or the receiving terminal D simultaneously receives the first radio signal and the second radio signal, the receiving terminal B or the receiving terminal D transmits a delay signal to the transmitting terminal A or the transmitting terminal C through the base station, The transmitting terminal A or the transmitting terminal C applies for two consecutive idle time slots and transmits the radio signal again, and the receiving terminal B or the receiving terminal D continues to receive the radio signal in one time slot and forwards thesecond radio signal or the first radio signal in the other time slot. The method of the invention enables each terminal to act as a relay in the same frequency, and transmits communication information of a previous terminal for another terminal, thereby saving frequency resources.

The embodiment of the invention discloses a PDT cluster mini base station honeycomb type networking method and system. According to the multi-base station intensive coverage mode, the public security wireless communication support capacity can be greatly improved, the networking cost is reduced, and the frequency resources are saved. The method comprises the following steps: selecting base station points in various local police stations according to a honeycomb type networking rule; configuring base stations in the base station points; selecting switch points in public security sub-bureaus in various cities and counties according to the honeycomb type networking rule; configuring the switches in the switch points to serve as base station exchange nodes; and connecting the switches to a master switch in a central machine room. The system comprises base stations, switches and a general switch, wherein the base stations are configured on base station points selected in various local police stations according to the honeycomb type networking rule; the switches serve as the base station exchange nodes and are configured on the switch points selected in public security sub-bureaus in various cities and counties according to the honeycomb type networking rule; and the general switch is connected with the switches.

This invention relates to an emitting and receiving method for up-link in the MC-CDMA system including the following steps: emission: data flows of each user are divided into two paths by 2x2 orthogonal empty packet coding, the data flows of each are duplicated to form P paths of parallel data flows to be spread with frequency domain, the emitted symbol period is the integer multiple of the chip period, carrying out quick Fourier transformation to be added and emitted, receiving: carrying quick Fourier transformation to signals received by antennas, de-spreading, matching and filtering signals of each sub-carrier of each user then to carry out empty time decode and time domain merging then frequency domain merging to the merged signals and then space domain merging to get the decisive variable of the user signals and then demodulating BPSK to resume data signals of the user.

The invention provides a wireless digital link relaying method. An operation of single-frequency-point time-division forwarding is performed by using a double-timeslot TDMA (time division multiple address) air interface, and through arranging a directional antenna and a dynamic antenna switch on a link machine, in the process of sending a link to a lower link machine, the directional antenna is switched to be aligned at the lower link machine. According to the wireless digital link relaying method disclosed by the invention, a single-frequency-point link forwarding function is realized by using the double-timeslot TDMA air interface, so that a quick response function can be realized in a network structure without center node, thereby greatly saving frequency resources.

A method for improving TD-SCDMA system capacity comprises the following steps: according to the inherent physical isolation of a wireless radio transmission environment or by setting different direction angles to different beams, a service cell is divided into N subsidiary spaces, and independent antenna terminals are arranged for the each subsidiary space; a RNC allocates channel resources for the each subsidiary space according to a spatial multiplexing mechanism; when UE requests to be randomly connected into a network, the RNC controls in an admission way according to the subsidiary spaces, at which the UE is located, and the under of the N, when the UE is allowed to be connected, the resources of the subsidiary spaces are used for allocating the resources for the UE; after the UE establishes connection, a base station monitors whether an antenna port which receives a UE uplink signal with the strongest power changes, if the antenna port changes, the RNC is notified that the subsidiary space which is corresponding to the changed antenna port switches the channel which is used for the spatial multiplexing of the UE onto the changed antenna port; and when the UE requests to transmit data, the UE is dispatched according to the subsidiary spaces, at which the UE is located. The invention can improve the utilization of frequency spectrum and reduce the operation maintenance cost of the system.

The invention provides an SMA link double spreading code signal multiplexing method, which can significantly improve the relay satellite system S-band phased array multi-access link SMA transmission ability and the multi-target service ability and increase the signal bandwidth utilization rate. According to the technical scheme of the invention, in an uplink modulator at the relay satellite transmitting end, primary spreading code signals generated by N paths of array elements are subjected to secondary spreading treatment to generate double spreading code signals, one path of single-carrier reference signals generated by a crystal oscillator are subjected to the same spreading treatment, the N paths of array elements of double spreading code signals which keep synchronization are additively synthesized into one path of signals; and a relay satellite ground receiving system guides the N paths of secondary spreading signals to despread through firstly despreading the reference signals, the signals are combined into one path of signals through a digital beam synthesizer, the synthesized one path of signals are outputted to a baseband of the receiving end for primary spreading signal dispreading and demodulation, and each path of array element signals is restored.

The invention relates to a variable band width frequency-shift and frequency-selective digital repeater which comprises a base station, an access machine and a remote machine, wherein the access machine comprises a downlink duplexer, a step attenuator, a downlink frequency shifter, a power amplifier and an uplink duplexer that are sequentially connected with each other in a downlink way; the access machine further comprises a low noise amplifier, an uplink frequency shifter and a downlink duplexer that are sequentially connected with each other in an uplink way; the uplink frequency shifter and the downlink frequency shifter are internally cured with frequency conversion program; the remote machine includes a downlink duplexer, a downlink low noise power amplifier, a downlink digital frequency-shift and frequency-selective module, a downlink companding frequency-shift unit and a downlink power amplifier which are sequentially connected with each other in a downlink way; the remote machine further includes an uplink duplexer, an uplink low noise power amplifier, an uplink digital frequency-shift and frequency-selective module, an uplink companding frequency-shift unit and an uplinkpower amplifier that are sequentially connected with each other in an uplink way; and the uplink and the downlink digital frequency-shift and frequency-selective modules are internally cured with frequency-shift and frequency-selective program. The digital repeater can achieve the aim of controlling band width by the frequency conversion program and the frequency-shift and frequency-selective program, thus having strong noise suppression capability and low frequency interference risk.

The invention discloses a ground digital television system with wired transmission and wireless coverage. In the invention, by utilizing largely constructed HFC network transmission, concentration code and well modulated broadband ground digital television signal, in an area which needs wireless coverage, a low power broadband transmitter and directional aerial are employed to carry out covering directly. By employing a co-frequency multi-point wireless coverage mode and inhibiting co-frequency interference through controlling coverage area field intensity and field type, large scope coverage is realized. Thus problems of co-frequency interference and lack of frequency resource are solved with the above simple method, and problems of large scope and low cost wired transmission and wireless coverage in rural area are also solved. The ground digital television system provided in the invention has good effect on extending cable television coverage, enlarging service scope and saving investment.

The invention discloses a vehicle-mounted interphone with a same-frequency relay function. The vehicle-mounted interphone comprises an antenna port, a transceiving switch circuit, a receiving frequency selection circuit, a power amplification circuit, a transmitting radio frequency unit, a receiving radio frequency unit, a digital baseband unit, a coding and decoding unit, an external clock circuit, a microprocessor and a power supply unit. According to the vehicle-mounted interphone, the limitation that two machines are respectively used for receiving and transmitting, a duplexer and at leastone antenna are needed, and a traditional relay station erection scheme of two frequencies needs to be applied in the past is solved, and the same-frequency relay function is realized. According to the vehicle-mounted radio station, the same-frequency relay function can be achieved only by matching one vehicle-mounted interphone with one antenna, compared with a traditional pilot frequency relaystation, frequency resources are saved, purchase funds are saved. Meanwhile, frequency point selection is not limited by the frequency bandwidth of a duplexer, operation is easy and convenient, and communication is efficient and guaranteed.

The invention discloses a 3G (third-generation) broadband digitalized super-remote wireless transmission system, which comprises a near terminal, a remote terminal and a WCDMA (wideband code division multiple access) data card. The near terminal is communicated with the remote terminal through a relay antenna, the transmission frequency of the relay antenna adopts an intermediate frequency bandwidth, and the information transmission between the WCDMA data card and a service station is performed through a service antenna. Based on the WCDMA interface standard, the near terminal is installed on the existing base station, and the remote terminal is installed on a service tower in remote areas, so that the super-remote transmission of wireless communication is realized, the problem of 3G broadband access in the remote areas can be solved without cable laying, and the coverage rate of wireless network signals in hilly, mountainous and woodsy areas is increased.

The invention discloses a railway plane wireless shunting positioning method, which comprises the following steps of estimating the position of a current locomotive according to the position of the locomotive at the previous moment, and judging the accurate position of the locomotive according to a shunting section by combining measurement data of the position of the locomotive. Based on the method, the invention further discloses a railway plane wireless shunting system which comprises a warden station controller, a locomotive station controller, a handheld radio station and a cloud server. According to the invention, digital wireless communication is adopted; a shunting signal channel is kept unblocked; a positioning device is carried in the locomotive platform controller; the algorithmimprovement is carried out on the detection result of the positioning device; in the shunting process, accurate positioning of the rolling stock is realized, and the shunting process is displayed on the mobile and computer client through the cloud server. The operation complexity of shunting operation is simplified, the energy of operators is saved, the shunting accuracy is improved, the safety ofshunting operation is enhanced, and shunting accidents caused by personnel negligence are avoided.

The invention provides a method and a system for acquiring the capability of integrated mobile broadcast (IMB) technology by a wireless network controller. According to the invention, due to information interaction between a base station and the wireless network controller, the wireless network controller acquires sustaining power information from a cell charged by the base station to the IMB technology. The method ensures that an access network side acquires support capability of the IMB technology from the base station, guarantees that a correct decision whether to use the IMB technology is made, and is favorable for saving frequency resources.

The invention provides a terminal access method, and the method comprises the steps: deploying a first network for an area, and a second network which is interleaved with the first network at the samefrequency, wherein the second network serves as a backup network of the first network, the PLMN numbers in the network configuration information of the first network and the second network are different; configuring a priority higher than that of the second network for the first network. The method comprises the following steps: broadcasting the network configuration information and priority of afirst network and the network configuration information and priority of a second network; when receiving the network configuration information and the priority broadcasted by the base station, the user terminal obtaining and storing the network configuration information and the corresponding priority; when any user terminal needs to access the network, the user terminal accessing the network according to the stored network configuration information; and if two pieces of network configuration information with different PLMN numbers exist, selecting the network with the corresponding high priority to access. According to the method, the reliability of the system can be improved under the condition of saving frequency resources.

The invention discloses a photoelectric hybrid single-frequency network broadcasting method and a photoelectric hybrid single-frequency network broadcasting system. The method comprises the followingsteps: 1,the control center sends data streams and control signals to the radio transmitter and the visible light transmitter at the same time. A single-frequency network adapter is utilized to ensuresynchronization between the single-frequency network adapter and the transmitter; digital signal processing processes of the radio transmitter and the visible light transmitter before digital-to-analog conversion are kept consistent. Different transmitters respectively process according to the physical characteristics of different signals to obtain and transmit radio signals and visible light signals, and a receiver can independently receive the radio signals or the visible light signals, and can also simultaneously receive the two signals and perform superposition in different modes. According to the method, an equivalent hybrid single-frequency network system framework is realized, frequency resources are saved, the spectrum utilization rate is improved, a receiver can receive and combine radio signals and visible light signals, and seamless connection of indoor and outdoor signal coverage and seamless switching of signal receiving are realized.

The invention provides a data transmission method and a device. The invention is characterized in that the access information sent by two stations can be received, and the access information can be used to indicate the detection time of the user device and/or the receiving time of the upstream data received from the user device; the at least two stations are the synchronization points and belong to the same logic zone; various detection times are equal to each other according to the access information ; and/ or according to the access information, the receiving times are determined to be the same; according to the transmission time delay between the at least two stations, the sending time of the at least two stations toward the downstream data corresponding to the access information can be determined; the downstream data information can be sent to the at least two stations, the downstream data information can be used to indicate the downstream data and the sending time, therefore the downstream data can be sent to the user device by the stations at the sending time. The frequency resource can be saved.