Summary of the invention
In order to improve the bandwidth of operation of portable base station equipment, expand its application field, the present invention provides a kind of portableMultiband base station equipment, can support the National Radio committee and Ministry of Industry and Information is China Mobile, China Unicom and China TelecomWhole 2G/3G/4G LTE frequency ranges of three big operator's planning, can also receive the downlink signal of other base stations in cell simultaneously,Specific technical solution is a kind of portable multiband base station equipment, including metal shell, Radio Frequency Subsystem and Base-Band Processing subsystemSystem, Radio Frequency Subsystem and baseband are respectively individual boards, it is characterised in that: the Radio Frequency Subsystem, most beforeEnd is external broad-band antenna, and external antenna is connect by RF cable with Radio Frequency Subsystem board, transmitting and received two phasesOpposite direction signal is isolated by circulator and is assigned on its respective radio frequency path, and receiving path first passes through broadband low noiseAcoustic amplifier amplification, wideband low noise amplifier control its gain, amplified letter by the ARM or FPGA of Base-Band Processing boardNumber by a power splitter mean allocation at two receiving paths of RX1 and RX2, RX1 and RX2 receiving path is penetrated using prime SPnTFrequency switch is distributed into n branch and receives sub-channel, and every receives the band logical mode filter for different frequency range of connecting on sub-channel, and n branch receivesSub-channel selects the signal of one of frequency band to send two-way transceiver to through rear class SPnT RF switch again, and every grade of SPnT is penetratedFrequency switch by Base-Band Processing board ARM or FPGA control the selection of its logic wherein a certain branch sub-channel carry out signal biographyDefeated, two-way transceiver connects baseband FPGA by FMC interface, and is encapsulated in a complete metal shell,The FPGA of baseband is connect by PCI-E interface with user PC.
The sub-channel of the RX1 and RX2 access receives being divided into for frequency range, and RX1 access is mainly responsible for reception with the side FDDThe UL signal of the terminal transmission of formula work, while the UL/DL letter for the terminal and Base Transmitter that also receiving portion is worked in a manner of TDDNumber；RX2 access is mainly responsible for the DL signal of the reception Base Transmitter to work in a manner of FDD corresponding with RX1 access, while also connecingReceive the UL/DL signal of terminal and Base Transmitter that another part is worked in a manner of TDD.
The beneficial effects of the invention are as follows the whole communication standards and frequency range that can support domestic all operators, expand significantlyApplication range of the portable base station equipment under external field environment.It can also and desktop computer direct by PCI-E interface or penRemember the integrated assembly of this computer, realizes more direct and easily application.
Specific embodiment
It is described further below with reference to embodiment.
As shown in Figure 1, system is broadly divided into radio frequency and the big subsystem of Base-Band Processing two, baseband is by FPGA+The modulation /demodulation and encoding and decoding of digital signal are completed in DSP collocation, and the control by ARM chip microcontroller to each unit in circuit shouldBoard is connected with PC machine mainboard by PCI-E high speed digital interface to realize the transmission of modulating/demodulating digital signal.Due to the portionIt is point consistent with the band processing system hardware structure of traditional base station equipment, it is not belonging to unique technology main points of the invention, thereforeThis is not set forth in detail.The hardware structure of Radio Frequency Subsystem is the basic place for being different from traditional portable base station equipment, withUnder discuss in detail.
Radio Frequency Subsystem and baseband are respectively individual boards, and the two is connected by FMC interface, and is encapsulated inIn one complete metal shell.
The front end of Radio Frequency Subsystem is received using the external broad-band antenna of a 800MHz to 2.7GHz and transmitting is wirelessSignal, external antenna turn N-type radio frequency cable by SMA and connect with Radio Frequency Subsystem board.Two opposite directions of transmitting and receptionSignal be isolated by circulator and be assigned on its respective radio frequency path, circulator is customized product, work frequencyRate range is 800MHz to 2.7GHz, and bandwidth 60MHz, isolation is 40dB or more.Receiving path first passes through wideband low noiseAmplifier (LNA) amplification, LNA control its gain by the ARM or FPGA of Base-Band Processing board, and adjustable gain range is 0dBThe ADL5523 of ADI company is used herein as to 20dB, stepping 0.5dB.Amplified signal passes through a power splitter mean allocationAt two receiving paths of RX1 and RX2, RX1 receiving path is mainly used for receiving with the terminal transmission of frequency division duplex mode workUplink (UL) signal and certain UL/DL signals with the terminal of time division duplex work and base station equipment transmitting.RX2Receiving path is used to receive downlink (DL) signal of other base station equipment transmittings with frequency division duplex mode work in cell, withAnd supplement receive RX1 access do not support some other with time division duplex work terminal and base station equipment emitUL/DL signal.RX1 and RX2 receiving path is distributed into 10 reception sub-channels, every reception using prime SP10T RF switchThe filtering frequency of every sub-channel of the bandpass-type SAW filter (SAW) of series connection different frequency range on sub-channel, RX1 and RX2The division of section is as shown in Figure 3 and Figure 4, and the frequency range division mode of these sub-channels is the object that this patent is laid special stress on protecting.10 connectReceive sub-channel selects the signal of one of frequency band to send two-way transceiver to through rear class SP10T RF switch again(Transceiver), every grade of SP10T RF switch by Base-Band Processing board ARM or FPGA control its logic and select itIn a certain branch sub-channel open and carry out signal transmission.
The core component of Radio Frequency Subsystem is the Transceiver chip of one piece of two-way transmitting-receiving, used here as ADI companyAD9361 RF transceiver, the working frequency of chip range are 70MHz to 6GHz, and bandwidth is 200kHz to 56MHz, pass through RX1The reasonable frequencies segmentation of different sub-channels with RX2 access, can each mobile communication described in directly whole section of receptions table 1 frequentlySection.Such as the analog signal of the total 50MHz bandwidth of 2320MHz to 2370MHz of China Mobile TDD-LTE Band 40, passing throughEnter the port RX1 of AD9361 after the 9th sub-channel filtering of RX1 access.AD9361 is internally integrated up/down frequency converter, can will connectReceive to obtain the intermediate-freuqncy signal that samples at suitable ADC of analog signal Direct Conversion.The port RX1 and RX2 of AD9361, can be same respectivelyWhen receive base station DL signal and mobile phone UL signal；It can also be in the inscribed UL/DL letter for receiving time division duplex of a portNumber, then the clock synchronization module separating reducing controlled by FPGA is at UL and DL bit stream.TX1 is external as emission portThe wideband power amplifer (PA) of 800MHz to 2.7GHz forms transmitting path, is controlled by the ARM or FPGA of Base-Band Processing boardTransmitting gain processed realizes the transmitting of base station DL signal.
Main application scenarios have following several.
(1) by receiving the DL signal of fixed base stations transmitting in cell, whether normal its operating status is detected.
(2) if exception occurs in the fixed base station equipment in cell, the portable base station equipment can be used temporarily to replace solidFixed pattern base station equipment, for the communication with the mobile terminals such as mobile phone.
(3) it can search for and monitor the signal of the illegality equipments such as pseudo-base station transmitting.
The working principle of the portable base station equipment is introduced with three kinds of different modes below.
Formula communication is interacted with the terminal to work with frequency division duplex mode
Illustrate its course of work by taking 1 frequency range of China Unicom 3G WCDMA Band as an example.Certain terminal transmission one belongs toThe UL signal of some channel of the 1940MHz into 1955MHz frequency range, channel width 5MHz.Since there are other bases in cellThe noise signal of the various standards and each frequency range of station equipment and terminal transmission, so the signal will be mingled in a very broadbandNoise signal in.Antenna will receive all signals from 800MHz to 2.7GHz, include useful signal and noise signal, thenThe broadband signal is transferred to circulator.Circulator, which directs it, is transferred to receiving path.It is transferred to function after LNA amplifiesDivide device.Power splitter uniformly assigns them to RX1 and RX2 access.The prime SP10T RF switch of RX2 is controlled by baseband systemIt is in close state, the signal will be blocked in the transmission of RX2 access.The SP10T RF switch of RX1 access is controlled by baseband systemIn 6 open state of channel.SAW filter range on 6th sub-channel is 1940MHz to 1955MHz, after its filtering, will be hadIt is come out with signal extraction and is transferred to rear class SP10T RF switch.Rear class SP10T RF switch is controlled by baseband system in channelUseful signal is transferred to the port RX1 of Transceiver by 6 open states.It completes to believe the radio frequency inside TransceiverNumber be further amplified/filter with after down coversion, through FMC interface be transferred to baseband FPGA and DSP complete letterNumber demodulation/decoding form useful data steam, then data are transferred to PC by PCI-E interface and are further processed.
The portable base station equipment opposite direction will belong to respective channels of the 2130MHz into 2145MHz frequency range simultaneouslyDL signal is transmitted to terminal.The portable base station equipment is just completed with the terminal device in frequency division duplex mode and cell in this wayInteractive type communication.
Formula communication is interacted with the terminal to work with time division duplex
Illustrate its course of work by taking 39 frequency range of China Mobile 4G LTE Band as an example.Certain terminal transmission oneThe UL signal of 1880MHz some channel into 1900MHz frequency range, channel width 10MHz.The signal will also be mingled in one veryIn wide band noise signal.Antenna is to power splitter to the conditioning process of the broadband signal and conditioning process and " with frequency division pairIt is identical that the terminal that work mode works interacts formula communication.Power splitter uniformly assigns them to RX1 and RX2 access.Herein,The prime SP10T RF switch of RX2 is controlled by baseband system to be in close state, and the signal will be blocked in the transmission of RX2 access.The SP10T RF switch of RX1 access is controlled by baseband system in 7 open state of channel.SAW on 7th sub-channel filters modelEnclosing is 1880MHz to 1900MHz, after its filtering, useful signal is extracted and is transferred to rear class SP10T RF switch.AfterwardsGrade SP10T RF switch is controlled by baseband system in 7 open state of channel, and useful signal is transferred to Transceiver'sThe port RX1.Complete inside Transceiver to the radiofrequency signal be further amplified/filter and down coversion after, through FMC interfaceIt is transferred to the FPGA of baseband, FPGA controls the letter that clock synchronization circuit extracts UL time slot in the signal firstNumber, then the signal demodulate/decode forming useful data steam through FPGA and DSP, data are transferred to PC by PCI-E interfaceIt is further processed.
The portable base station equipment will belong to 1880MHz to 1900MHz frequency range under the control of clock synchronization circuit simultaneouslyIn respective channels DL signal, under the control of FPGA and clock synchronization circuit, in DL slot transmission to terminal.This is just in this wayThe formula base station equipment of taking just completes interactive type communication with the terminal device in time division duplex and cell.
Receive the base station DL signal to work with frequency division or time division duplex
Illustrate its course of work by taking 6 frequency range of China Telecom 3G CDMA2000/1xEV-DO Band Class as an example.Certain is pseudo-The Base Transmitter DL signal of one 2110MHz some channel into 2125MHz frequency range, channel width 5MHz.The signal willIt is mingled in a very wide band noise signal.Antenna is to power splitter to the conditioning process of the broadband signal and conditioning process" it is identical that formula communication is interacted with the terminal that frequency division duplex mode works.Power splitter uniformly assigns them to RX1 and RX2Access.The prime SP10T RF switch of RX1 is controlled by baseband system to be in close state, and the signal will be blocked in RX1 accessTransmission.The SP10T RF switch of RX2 access is controlled by baseband system in 5 open state of channel.SAW filter on 5th sub-channelWave range is 2110MHz to 2125MHz, after its filtering, useful signal is extracted and is transferred to rear class SP10T radio frequency and opensIt closes.Rear class SP10T RF switch is controlled by baseband system in 5 open state of channel, and useful signal is transferred toThe port RX2 of Transceiver.The down coversion to the radiofrequency signal is completed inside Transceiver and is further amplified/is filteredAfterwards, demodulation/decoding that the FPGA and DSP for being transferred to baseband through FMC interface complete signal forms useful data steam,Data PC is transferred to by PCI-E interface again to be further processed.