Summary of the invention
The object of the invention is to: a kind of multi-frequency-band digital optical fiber distributed type antenna system is provided, overcome the signal access of prior art and cover weak shortcoming, improve the effective coverage range of network.
To achieve these goals, the invention provides multi-frequency-band digital optical fiber distributed type antenna system, comprise the near-end machine and remote termination that are interconnected communication, described near-end machine comprises dual-mode antenna, coupler, near-end converter unit, near-end backboard unit, near-end digital intermediate frequency unit, near-end power subsystem and near-end main control unit, described dual-mode antenna is used for the wireless access of near-end spacing wave, and described coupler is for the radiofrequency signal of the base station that is coupled, described near-end converter unit, in the downlink for changing radiofrequency signal into intermediate-freuqncy signal, then providing local oscillator to described near-end digital intermediate frequency unit in the uplink, making it that intermediate-freuqncy signal is mixed to radio frequency, described near-end backboard unit is used for the switching of interconnected, the power supply of described near-end converter unit and described near-end digital intermediate frequency unit, described near-end digital intermediate frequency unit comprises near-end analog to digital conversion circuit, near-end D/A converting circuit, near-end baseband processing unit, near-end common public radio interface unit, near-end optical transceiver group, described near-end analog to digital conversion circuit is for accessing intermediate frequency filtering and the digital-to-analogue conversion of corresponding band, described near-end D/A converting circuit is used for the digital-to-analogue conversion of corresponding band and the intermediate frequency filtering after exporting thereof, described near-end baseband processing unit is used for the Base-Band Processing of signal, described near-end common public radio interface unit is used for carrying out data compression in the downlink, framing and decompressing in the uplink, separate frame, the transmission of monitor message and mesh information, described near-end optical transceiver group is used for the convert light signal of telecommunication and to carry out signal mutual with described remote termination, described near-end main control unit carries out information interaction by described backboard unit and described near-end digital intermediate frequency unit, and monitors described near-end power subsystem and switch, described remote termination comprises remote digital intermediate frequency unit, far-end backboard unit, far-end converter unit, multiplex's mixer unit and main control unit, described remote digital intermediate frequency unit comprises far-end optical transceiver group, far-end common public radio interface unit (CPRI), far-end baseband processing unit, far-end analog to digital conversion circuit, far-end feedback analog to digital conversion circuit, far-end D/A converting circuit, described far-end optical transceiver group is used for the convert light signal of telecommunication and to carry out signal mutual with described near-end machine, described far-end common public radio interface unit carries out data decompression in the downlink, separate frame and carry out data compression in the uplink, framing, the transmission of monitor message and mesh information, described far-end analog to digital conversion circuit is used for intermediate frequency filtering and the analog-to-digital conversion of multi-upstream access frequency range, described far-end feedback analog to digital conversion circuit is used for the intermediate frequency filtering of descending coupling power amplifier signal, analog-to-digital conversion and cooperation complete the digital pre-distortion of corresponding band, described far-end D/A converting circuit is used for the digital-to-analogue conversion of corresponding band and the intermediate frequency filtering after exporting thereof, described far-end backboard unit is used for the switching of interconnected, the power supply of described remote digital intermediate frequency unit and described far-end converter unit, described far-end converter unit is used for being used for changing radiofrequency signal into intermediate-freuqncy signal at up and feedback loop, descending, provides local oscillator to described remote digital intermediate frequency unit, makes it that intermediate-freuqncy signal is mixed to radio frequency, described multiplex's mixer unit is used for uplink and downlink signals filtering, described far-end main control unit is for the mutual of the information of carrying out and control.
As a modification of the present invention, described near-end machine comprises main near-end machine and proximally machine, described proximally machine is for receiving remote base station data, the near-end optical transceiver group of described main near-end machine comprises main near-end optical transceiver group and proximally optical transceiver group, it is mutual that described main near-end optical transceiver group is used for carrying out with described remote termination signal, and it is mutual that described proximally optical transceiver group is used for carrying out with described proximally machine signal.
As a modification of the present invention, in described near-end machine, described near-end converter unit is separated setting with near-end digital intermediate frequency unit, and described near-end converter unit is connected with the hot plug of described near-end backboard unit; In described remote termination, described far-end converter unit is separated setting with remote digital intermediate frequency unit; The frequency range number accessing near-end is controlled by the quantity of near-end converter unit described in hot plug; Far-end then realizes controlling the band number of access far-end common numbers plate by increasing or reduce T/R quantity.
As a modification of the present invention, the near-end power subsystem of described near-end machine comprises two power modules, and when normally working, two power module parallel connections, adopt the mode of current-sharing, when one of them abnormity of power supply, another one power supply works alone.
As a modification of the present invention, if system adopts multi-input multi-output system (MIMO), then need the data of multi-input multi-output system (MIMO) frequency range to be separated, by the transmitting respectively utilizing multiplex's mixer unit R 1 and multiplex's mixer unit R 2 to carry out separately data; If do not consider MIMO, then export all frequency ranges to antenna by same multiband mixer R1 and cover.
As a modification of the present invention, described near-end machine also comprises a near-end kilomega network processing unit be connected with described near-end common public radio interface unit, and described remote termination also comprises a far-end kilomega network processing unit be connected with described far-end common public radio interface unit.
Compared with prior art, the shortcomings such as multi-frequency-band digital optical fiber distributed type antenna system of the present invention has taken that prior art convenient can not be supported MIMO, do not possess proximal spread function, incompatible kilomega network data penetration transmission, radio frequency and if system cannot be separated, improve effective range of application of system.Meet the application demand of multiband, multi-modulation scheme, large bandwidth in existing communication network, realize the construction expection of Joint construction and sharing.Therefore system proposed by the invention, in the application of the network coverage, will have boundless application prospect.
Embodiment
In order to make goal of the invention of the present invention, technical scheme and Advantageous Effects thereof more clear, below in conjunction with the drawings and specific embodiments, the present invention is further elaborated.Should be understood that, the embodiment described in this specification is only used to explain the present invention, is not intended to limit the present invention.
Refer to Fig. 1, Fig. 2 and Fig. 3, multi-frequency-band digital optical fiber distributed type antenna system of the present invention comprises the near-end machine and remote termination that are interconnected communication, in near-end machine and remote termination, comprise following part:
Dual-mode antenna AML: the wireless access completing near-end spacing wave, wherein: A id signal access way is antenna, M identifies near-end, L value is natural number, the L frequency range of mark wireless receiving;
Coupler MN: for the radiofrequency signal of the base station that is coupled, wherein: N value natural number, N number of frequency range of mark coupling access;
T/RMN: descending for changing radiofrequency signal into intermediate-freuqncy signal, up, provides local oscillator to near-end digiboard DSPU unit, makes it that intermediate-freuqncy signal is mixed to radio frequency.The present invention adopts radio frequency T/R and digital intermediate frequency plate independent design, by backplane interconnects, is made the T/R unit hot plug of each frequency range by blind plugging function, freely can control the frequency range number accessing public number plate;
Backboard M1: the backboard of near-end, for completing interconnected, the switching of power supply, the monitor message forwarding etc. of near-end DSPU unit of near-end T/R unit and digiboard DSPU;
The A/D change-over circuit of A/DMN: near-end N frequency range, for completing intermediate frequency filtering and the digital-to-analogue conversion of access frequency range;
The D/A change-over circuit of D/AMN: near-end N frequency range, for completing the digital-to-analogue conversion of this frequency range and the intermediate frequency filtering after exporting thereof;
Base-Band Processing M1: near-end baseband processing unit, the Base-Band Processing of main settling signal, comprises: the functions such as zero intermediate frequency conversion, digital filtering, gain control, power detection, power control, TD-LTE up-downgoing switch control rule, the control of GSM time slot switch;
The processing section of CPRIM1: near-end CPRI transmission protocol, mainly completes data compression, framing descending, descendingly completes decompression, separates the operation of frame and monitor message, the transmission of mesh information;
Optical transceiver group M1: near-end from Guang Kou, complete the conversion of electro-optical signal, be mainly used in the signal expanding D-OMU mutual;
Optical transceiver group M2: the main light port of near-end, completes the conversion of electro-optical signal, has been mainly used in the signal of far-end D-ORU mutual;
Power ps U1 and power ps U2: two power modules, two power sources in parallel during normal work, adopt the mode of current-sharing; When one of them module is abnormal, an other modular power source works alone, and guarantees that system is normally run, and strengthens system reliability;
Near-end monitoring MCUM1: near-end main control unit, completes the information interaction with near-end DSPU by backboard, reaches the object monitoring the whole network information, and to the power work monitoring state of near-end and switching;
Optical transceiver group R1: far-end light mouth, completes the conversion of electro-optical signal, mainly completes and the information interaction of near-end main light port and the information interaction with far-end next stage cascade module;
The processing section of CPRIR1: far-end CPRI transmission protocol, mainly descendingly completes data decompression, is separating frame, the up transmission completing compression, the operation of framing and monitor message, mesh information;
Base-Band Processing R1: the base band data processing unit of far-end, mainly comprise that gain control, power control, power amplifier protection, CFR (peak-to-average force ratio reduction), DPD (digital pre-distortion), TD-LTE uplink and downlink timeslot are synchronous, the process of GSM slot synchronization, traffic statistic etc.
Remote monitoring MCUR1: realize the information interaction to each peripheral hardware of far-end, control, digit chip configuration etc.;
Backboard R1: the backboard of far-end, the switching etc. of, power supply interconnected for the monitoring completing far-end T/R unit and remote digital plate DSPU;
The A/D change-over circuit of A/DRN_0: far-end N frequency range, for completing intermediate frequency filtering and the analog-to-digital conversion of multi-upstream access frequency range;
The feedback A/D change-over circuit of A/DRN_1: far-end N frequency range, for completing intermediate frequency filtering and the analog-to-digital conversion of descending coupling power amplifier signal, is mainly used in the digital pre-distortion having coordinated N frequency range;
The D/A change-over circuit of D/ARN: far-end N frequency range, for completing the digital-to-analogue conversion of this frequency range and the intermediate frequency filtering after exporting thereof;
The T/R of T/RRN: far-end N frequency range, is used for changing radiofrequency signal into intermediate-freuqncy signal at up and feedback loop, descending, provides local oscillator to remote digital plate DSPU unit, makes it that intermediate-freuqncy signal is mixed to radio frequency.T/R at the corresponding levels and digital intermediate frequency plate independent design, realize controlling the number of frequency bands of access far-end common numbers plate by increasing or reduce far-end T/R;
Multiplex's mixer unit R: for the filtering of far-end uplink and downlink signals, it possesses Multi-frequency band combination road function; If consider the application of MIMO, need MIMO frequency range to be separated herein, two channel separation launched separately in multiplex's mixer unit R 1 and multiplex's mixer unit R 2, current Typical Disposition is the MIMO of 2*2; If do not consider MIMO, then can export all frequency ranges to antenna by same multiband mixer R1 and cover.
The job step of multi-frequency-band digital optical fiber distributed type antenna system of the present invention comprises following a few major part:
1, the downlink working step of main D-OMU signal coupling signal:
The N frequency range radiofrequency signal of step 1-1: coupler N coupling Base Transmitter, wherein N is band number, gets 1,2,3,4 Typical Disposition of the present invention is 4, and maximum configured is 8, but is not limited only to 8 frequently, and it can upgrade in back-up system expansion;
The N frequency range radiofrequency signal that step: 1-2: step 1-1 is coupled is through the Frequency mixing processing of T/RMN, produce intermediate-freuqncy signal, the IF-FRE designed in the present invention is unified is 204.32MHz, this frequency can need to adjust according to system, wherein M identifies near-end mark, and N is the N frequency range label described in step 1-1;
Step 1-3:A/DMN link carries out intermediate frequency filtering to the intermediate-freuqncy signal that T/RMN produces, and is then sampled to intermediate frequency data by A/D chip, realizes digital-to-analogue conversion, and sample rate adopts 245.76MSPS herein;
Step 1-4: near-end baseband processing unit M1 carries out Base-Band Processing to the digital medium-frequency signal of all frequency ranges, mainly completes function: zero intermediate frequency conversion, signal filtering, gain control, power statistic, power control etc.;
Step 1-5:CPRIM1 unit each frequency band digital to step 1-4 carries out the function such as data compression, framing, become to be applicable to the base band data of Optical Fiber Transmission according to CPRI protocol conversion by data, optical module speed of the present invention adopts 10G, can be adjusted to 6.25G or higher data rate according to system application;
Step 1-6: to the data processed in step 1-5, optical transceiver group M2 transmits it to far-end D-ORU by optical fiber;
The light signal that step 1-7: far-end optical transceiver group R1 reception near-end transmits, is carried out opto-electronic conversion;
Step 1-8:CPRIR1 module receives the CPRI data from step 1-7, and it is carried out to the power and energy such as solution frame, data decompression, wherein R is distal marker;
Step 1-9: Base-Band Processing R1 carries out frequency-division section process to all frequency range data of CRPIR1 decomposition module, comprises: gain control, power control, power amplifier protection, CFR (peak-to-average force ratio reduction), DPD (digital pre-distortion), TD-LTE uplink and downlink timeslot are synchronous, GSM slot synchronization process etc.;
Step 1-10: the data after the process of step 1-9 carry out digital-to-analogue conversion through D/ARN link to it, and carry out intermediate frequency filtering, realize signal by the conversion of base band to intermediate frequency, and carry out mixing with local oscillator, realize the conversion of intermediate frequency to radiofrequency signal;
Step 1-11:T/RRN unit comprises the power amplifier of N frequency range, therefore this step mainly completes the amplification to N frequency range downlink radio-frequency signal;
Step 1-12: multiplex's mixer unit receives the N frequency range radiofrequency signal after amplifying, radiation is carried out through antenna after filtering is carried out to it, because system wants compatible MIMO therefore reserved 1 passage exported, if do not use MIMO, all frequency ranges can be carried out multifrequency via multiplex's mixer unit R 1 and be closed road output.
2, the downlink working step of D-OMU coupled signal is expanded:
The downlink working step 2-1 to step 2-5 of expansion D-OMU coupled signal is identical with the job step 1-1 to 1-5 of main D-OMU, repeats no more herein;
The optical transceiver group M2 of step 2-6: to the data processed in step 2-5, expansion D-OMU transmits it to the optical transceiver group M1 of main D-OMU by optical fiber;
Complete opto-electronic conversion after the optical transceiver group M1 of step 2-7: main D-OMU receives signal, send data to CPRIM1 module, after needing the frequency range data of transmission to carry out data compression, framing, pass to optical transceiver group M2 by this module;
Subsequent step 2-8 to 2-14 is identical with the job step 1-6 to 1-12 of main D-OMU, repeats no more herein.
3, kilomega network (WLAN) data mainly realize transparent transmission function, and system does not process it, and its downlink working step is as follows:
Step 3-1: main D-OMU receives the WLAN network data of base station by RJ45;
Step 3-2: kilomega network processing unit M1 resolves kilomega network data, completes data and extracts;
Step 3-3:CPRIM1 module carries out framing to the kilomega network data extracted;
Step 3-4: the kilomega network data after framing completes are sent to far-end D-ORU by the light mouth of optical transceiver group M2 via optical fiber;
Step 3-5: far-end D-ORU receive fiber data by optical transceiver group R1 after, by far-end CPRIR1, parsing is completed to kilomega network data;
Step 3-6: kilomega network processing unit R1 forwards data, carries out far-end covering finally by RJ45.
4, when the main D-OMU of near-end carries out the covering of near-end transmission of wireless signals by dual-mode antenna, its downlink working step is as follows:
The be coupled working method of base station signal of signal working method and the main D-OMU of this part is identical, and difference is the access way of near end signal.If adopt this kind of cloth net mode, only need near-end that signal is accessed signal by dual-mode antenna AML, wherein a-signal accesses in antenna mode, and M identifies near-end, and L value is that natural number identifies L frequency range.
5, up is the inverse process of downlink data flow process, the up job step of main D-OMU signal coupling signal:
Step 5-1: remote antenna receives N frequency range radiofrequency signal;
Step 5-2: multiplex's mixer unit carries out filter process to the N frequency range radiofrequency signal that step 4-1 receives;
Step 5-3: the step 5-2 N frequency range radiofrequency signal received, through the Frequency mixing processing of T/RRN, produces intermediate-freuqncy signal, and the IF-FRE designed in the present invention is unified is 204.32MHz, and this frequency can need to adjust according to system;
Step 5-4:A/DRN_0 link carries out intermediate frequency filtering to the intermediate-freuqncy signal that T/RRN produces, and is then sampled to intermediate frequency data by A/D chip, realizes digital-to-analogue conversion, and sample rate adopts 245.76MSPS herein; The A/DRN_1 of far-end mainly samples the power amplifier output signal of this frequency range of coupling that T/RRN_1 returns, the auxiliary digital predistortion function realizing this frequency range;
Step 5-5: far-end baseband processing unit R1 carries out digital base band processor to the digital medium-frequency signal of all frequency ranges, mainly completes function: zero intermediate frequency conversion, signal filtering, gain control, power statistic, power control, the control of TD-LTE uplink and downlink timeslot, GSM sequence control, traffic statistic etc.;
Step 5-6:CPRIR1 unit each frequency band digital to step 5-5 carries out the function such as data compression, framing, becomes to be applicable to the base band data of Optical Fiber Transmission by data according to CPRI protocol conversion;
Step 5-7: to the data processed in step 5-6, far-end optical transceiver group R1 transmits it to near-end D-OMU by optical fiber;
The light signal that step 5-8: near-end optical transceiver group M2 reception far-end transmits, is carried out opto-electronic conversion;
Step 5-9:CPRIM1 module receives the CPRI data from step 5-8, it is carried out to the power and energy such as solution frame, data decompression;
Step 5-10: Base-Band Processing M1 carries out frequency-division section process to all frequency range data of CRPIM1 decomposition module, comprises: gain control, power control, power statistic etc.;
Step 5-11: the data after the process of step 5-10 carry out digital-to-analogue conversion through D/AMN link to it, and carry out intermediate frequency filtering, realize signal by the conversion of base band to intermediate frequency, and carry out mixing with local oscillator, realize the conversion of intermediate frequency to radiofrequency signal;
Step 5-12:T/RMN unit is finally finished receiving the transmission of upstream data after carrying out certain amplification process to upward signal by base station.
6, the up job step of D-OMU coupled signal is expanded:
The up job step 6-1 to step 6-8 of expansion D-OMU coupled signal is identical with the job step 5-1 to 5-8 of main D-OMU, repeats no more herein;
Step 6-9:CPRIM1 module receives the CPRI data from step 6-8, it is carried out to the power and energy such as solution frame, data decompression, and the data belonging to expansion D-OMU are sent to optical transceiver group M1;
Step 6-10: to the data processed in step 6-9, main D-OMU optical transceiver group M1 transmit it to the optical transceiver group M2 of expansion D-OMU by optical fiber;
Subsequent step 6-11 to 6-14 is identical with the job step 5-9 to 5-12 of main D-OMU, repeats no more herein.
7, kilomega network (WLAN) data mainly realize transparent transmission function, and system does not process it, and its up job step is as follows:
Step 7-1: far-end D-ORU receives the WLAN network data of base station by RJ45;
Step 7-2: kilomega network processing unit R1 resolves kilomega network data, completes data and extracts;
Step 7-3:CPRIR1 module carries out framing to the kilomega network data extracted;
Step 7-4: the kilomega network data after framing completes are sent to the main D-OMU of near-end by the light mouth of optical transceiver group R1 via optical fiber;
Step 7-5: near-end D-OMU receive fiber data by optical transceiver group M1 after, by near-end CPRIM1, parsing is completed to kilomega network data;
Step 7-6: kilomega network processing unit M1 forwards data, carries out up passback finally by RJ45.
8, when the main D-OMU of near-end carries out the covering of near-end transmission of wireless signals by dual-mode antenna, its up job step is as follows:
The be coupled working method of base station signal of signal working method and the main D-OMU of this part is identical, and difference is the way of output of near end signal.If adopt this kind of cloth net mode, only at near-end, signal need be outputed signal by dual-mode antenna AML.