CN102208940A - Radio frequency system - Google Patents
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- CN102208940A CN102208940A CN2011101324555A CN201110132455A CN102208940A CN 102208940 A CN102208940 A CN 102208940A CN 2011101324555 A CN2011101324555 A CN 2011101324555A CN 201110132455 A CN201110132455 A CN 201110132455A CN 102208940 A CN102208940 A CN 102208940A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention discloses a radio frequency system. According to the invention, a radio frequency remote operation can be carried out without adding external combined equipment. The radio frequency system comprises a filtering unit, a main control unit, and at least two radio frequency units. Each radio frequency unit is respectively connected with the main control unit and the filtering unit. The filtering unit is used for combining and filtering received signals of all radio frequency units and emitting filtered signals together by an antenna; besides, the filtering unit is also used for shunting and filtering received signals by the antenna and sending each received signal to a corresponding radio frequency unit. Each radio frequency unit is used for carrying out an amplifying and filtering process and a down conversion process on received signals from the filtering unit and sending the processed signals to the main control unit; besides, the each radio frequency unit is also used for carrying out modulation, up conversion, and amplification on signals from the main control unit and sending the processed signals to the filtering unit. The main control unit is used for allowing the signal transformation between a BBU and a radio frequency unit.
Description
Technical field
The present invention relates to communication technical field, be meant a kind of radio system especially.
Background technology
The existing wireless communications system adopts the outside demand that the mode of installing on the road is finished wireless network of closing when supporting the multi-modulation scheme multiband.For supporting the more application of multi-modulation scheme and frequency range, reduce the expense of installation and removal, what antenna adopted is the wideband design, can cover a plurality of frequency ranges simultaneously, as shown in Figure 1, be example with single-antenna remote radio module (RRU), when the RRU of different systems is connected with antenna, adopt the mode of closing the road.
The scheme of the fiber optic stretch RRU that existing 3G (Third Generation) Moblie base station system adopts, more more Zao the radio frequency scheme that zooms out is greatly improved, it is popular design in the present 3G (Third Generation) Moblie network, in the Integrated Solution of supporting the multi-modulation scheme multiband, existing mode can effectively be utilized existing RRU, expansion is convenient, but still has certain drawback.One has increased the outside and has closed pipeline equipment, and this equipment need satisfy the function of outdoor application such as waterproof simultaneously, has increased equipment cost, has reduced the reliability of system; Its two, need dismantle antenna and RRU equipment simultaneously during extended frequency band, cause the not convenient property of expansion and the complexity of maintenance.
Summary of the invention
The purpose of this invention is to provide a kind of radio system, achieve radio frequency and zoom out in the scheme, do not need to increase the outside and close pipeline equipment.
A kind of radio system provided by the invention comprises: filter unit, main control unit and at least two radio frequency units, and each radio frequency unit links to each other with filter unit with main control unit respectively,
Filter unit, the signal that is used for all radio frequency units that will receive closes road and filtering, and filtered signal is launched by antenna together; To carry out shunt, filtering by the signal that antenna receives, and every road signal that will obtain sends to corresponding radio frequency unit;
Each radio frequency unit, the signal that is used for receiving described filter unit carries out sending to main control unit after amplification filtering, the down-converted; Be used for to modulate from the signal of master control unit, send to filter unit after the up-conversion, processing and amplifying;
Main control unit is used for providing power for operation to each radio frequency unit; With the conversion of signals of receiving from each radio frequency unit is digital signal, and data-signal is carried out obtaining baseband signal after FPGA handles, and sends to baseband processing unit (BBU); To carry out being converted to analog signal after FPGA handles from the baseband signal of BBU and send to corresponding radio frequency unit.
The radio system of the embodiment of the invention can be supported multiplex communication, and descending, each radio frequency unit will be modulated from the signal of master control unit, send to filter unit after the up-conversion, processing and amplifying; The signal of all radio frequency units that filter unit will receive carries out frequency and closes the road processing, and the signal that will close after handle on the road is launched by antenna; Up, filter unit will carry out frequency by the signal that antenna receives along separate routes, and every road signal that will obtain sends to corresponding radio frequency unit; Each radio frequency unit, the signal that is used for receiving carries out sending to main control unit after amplification filtering, the down-converted; Main control unit, the conversion of signals from each radio frequency unit that is used for receiving is a digital signal, and data-signal is carried out obtaining baseband signal after FPGA handles, and sends to BBU.This scheme does not need to increase the outside and closes pipeline equipment realizing that radio frequency zooms out in the scheme.
Description of drawings
Fig. 1 is the shared antenna of different systems in the prior art connection diagram of arranging net;
Fig. 2 is the structural representation of radio system of the support multi-modulation scheme of the embodiment of the invention;
Fig. 3 is the structural representation of the radio frequency unit when adopting the TDD network formats in the radio system of support multi-modulation scheme of the embodiment of the invention;
Fig. 4 is the structural representation of the radio frequency unit when adopting the FDD network formats in the radio system of support multi-modulation scheme of the embodiment of the invention;
Fig. 5 is the structural representation of employing time division duplex (TDD) the standard radio system of the embodiment of the invention;
Fig. 6 is the structural representation of the employing FDD standard radio system of the embodiment of the invention;
Fig. 7 adopts the structural representation of the radio system of multiple support for the embodiment of the invention;
Fig. 8 a is depicted as the schematic diagram of the radio system of the support multi-modulation scheme multiband that directly is connected with different systems BBU in the embodiment of the invention;
Fig. 8 b is depicted as in the embodiment of the invention schematic diagram that two single fibers are supported the radio system of TDD and FDD simultaneously;
Fig. 9 a is the radio-frequency module schematic diagram of embodiment of the invention tdd mode;
Fig. 9 b is the radio-frequency module schematic diagram of the fdd mode of the embodiment of the invention;
Figure 10 is a TDD-LTE structure of time slot schematic diagram.
Embodiment
In order to support the multi-modulation scheme multiband better, and the extensibility of raising system design, the embodiment of the invention adopts the design of supporting the multi-modulation scheme radio system, radio frequency units such as power amplifier, LNA, transceiver are made a module, directly be connected through filter unit, can cover the mode of two or more combined antennas, satisfy the demand of multichannel, many power with aerial array, and simplify the project installation complexity, optimize the wireless system network performance.
Referring to shown in Figure 2, in the communication system of supporting multi-modulation scheme, the radio system that the embodiment of the invention provides comprises: filter unit 21, main control unit 23 and at least two radio frequency units 22, each radio frequency unit 22 corresponding a kind of network formats, and link to each other with filter unit 21 with main control unit 23 respectively, wherein
Each radio frequency unit 22, the signal that is used for receiving carries out sending to main control unit after amplification filtering, the down-converted; Be used for to modulate from the signal of master control unit, send to filter unit after the up-conversion, processing and amplifying;
Main control unit 23 is used for providing power for operation to each radio frequency unit; With the conversion of signals of receiving from each radio frequency unit is digital signal, and data-signal is carried out obtaining baseband signal after FPGA handles, and sends to BBU; To carry out being converted to analog signal after FPGA handles from the baseband signal of every kind of standard of BBU and send to corresponding radio frequency unit.
When each radio frequency unit all adopted the TDD standard, filter unit can be filter.When each radio frequency unit all adopts the FDD standard, then filter unit can be duplexer.When a kind of network formats of each radio frequency unit correspondence, then described filter unit can be the frequency mixer.
Described main control unit 22 comprises: FPGA 231, AD conversion unit 232, D/A conversion unit 233 and power supply 234, wherein, FPGA 231 links to each other with AD conversion unit 232, D/A conversion unit 233, power supply 234 links to each other with FPGA 221 and radio frequency unit, and being used for provides power for operation to the unit of its connection;
AD conversion unit 232, the conversion of signals from each radio frequency unit that is used for receiving are to send to FPGA after the digital signal to handle;
D/A conversion unit 233 is used for the digital signal from FPGA is converted to and sends to corresponding radio frequency unit after the analog signal.
In order to support multichannel better, and the extensibility of raising system design, the embodiment of the invention adopts the design of supporting multichannel radio system, radio frequency units such as power amplifier, LNA, transceiver are made a module, directly be connected through filter, can cover the mode of two or more combined antennas, satisfy multichannel demand with aerial array, and simplify the project installation complexity, optimize the wireless system network performance.
Referring to shown in Figure 3, when the signal of radio frequency unit correspondence adopts the TDD network formats, comprise switch unit, transmitter unit, DPD feedback unit and receiving element, wherein,
Transmitter unit 32, be used for the signal that receives modulate, processing and amplifying, and the signal after the processing and amplifying carried out up-conversion, will carry out sending filter unit after the power amplification through the signal after the upconversion process.
DPD feedback unit 33, the signal that the described transmitter unit that is used to be coupled sends, and the signal that is coupled to carried out after matching attenuation handles carries out feeding back to main control unit after down-conversion, amplification, the Filtering Processing and carries out data processing.
Receiving element 34, the signal that is used for receiving carries out sending to main control unit after low noise amplification, filtering and the down-converted.
Described switch unit 31 is used for the time slot signal according to TDD transceiving switch-over control signal navigation system, and receives and dispatches switching controls according to described time slot signal.
Described switch unit 31 is used for when the transmitting-receiving switching controls, shifts to an earlier date the switching point that corresponding Timing Advance control transmitting-receiving is switched according to constant time lag.
Referring to shown in Figure 4, when the signal of radio frequency unit correspondence adopted the TDD network formats, described radio frequency unit comprised transmitter unit 41, DPD feedback unit 42 and receiving element 43, wherein,
Transmitter unit 41, be used for the signal that receives modulate, processing and amplifying, and the signal after the processing and amplifying carried out up-conversion, will carry out sending filter unit after the power amplification through the signal after the upconversion process;
DPD feedback unit 42, the signal that the described transmitter unit that is used to be coupled sends, and the signal that is coupled to carried out after matching attenuation handles carries out feeding back to main control unit after down-conversion, amplification, the Filtering Processing and carries out data processing;
Receiving element 43, the signal that is used for receiving carries out sending to main control unit after low noise amplification, filtering and the down-converted.
Lift specific embodiment below in conjunction with accompanying drawing and describe technical scheme of the present invention in detail.
Referring to shown in Figure 5, the embodiment of the invention also provides a kind of radio system, adopt the TDD standard, this system comprises: filter 51, main control unit 53 and at least two radio frequency units 52, wherein, each radio frequency unit links to each other with filter unit with main control unit respectively, and main control unit is used for providing power for operation to each radio frequency unit, wherein
Each radio frequency unit 52, the signal that is used for receiving carries out sending to main control unit after amplification filtering, the down-converted; Be used for to modulate from the signal of master control unit, send to filter unit after the up-conversion, processing and amplifying;
Main control unit 53, the conversion of signals from each radio frequency unit that is used for receiving is a digital signal, and data-signal is carried out obtaining baseband signal after FPGA handles, and sends to BBU; To carry out being converted to analog signal after FPGA handles from the baseband signal of every kind of standard of BBU and send to corresponding radio frequency unit.
Described main control unit comprises: FPGA, D/A conversion unit, AD conversion unit and power supply, wherein, FPGA links to each other with D/A conversion unit, AD conversion unit, D/A conversion unit, AD conversion unit link to each other with each radio frequency unit, power supply links to each other with FPGA and each radio frequency unit, be used to provide power for operation, wherein
FPGA is used for obtaining baseband signal and sending to BBU after FPGA handles carrying out from the digital signal of AD conversion unit; To carry out sending to D/A conversion unit after FPGA handles from the baseband signal of every kind of standard of BBU;
AD conversion unit, the conversion of signals from each radio frequency unit that is used for receiving are to send to FPGA after the digital signal to handle;
D/A conversion unit is used for sending to corresponding radio frequency unit after digital signal with FPGA is converted to analog signal.
In the scheme of the foregoing description, can adopt; Filter is as filter unit, thereby the radio frequency of realizing the different passages of TDD system zooms out scheme, does not also need to increase the outside and closes pipeline equipment.
Referring to shown in Figure 6, the radio system of the embodiment of the invention, adopt the FDD standard, this system comprises: duplexer 61, main control unit 63 and at least two radio frequency units 62, wherein, each radio frequency unit links to each other with duplexer with main control unit respectively, and main control unit is used for providing power for operation to each radio frequency unit
Each radio frequency unit 62, the signal that is used for receiving carries out sending to main control unit after amplification filtering, the down-converted; Be used for to modulate from the signal of master control unit, send to filter unit after the up-conversion, processing and amplifying;
Main control unit 63, the conversion of signals from each radio frequency unit that is used for receiving is a digital signal, and data-signal is carried out obtaining baseband signal after FPGA handles, and sends to BBU; To carry out being converted to analog signal after FPGA handles from the baseband signal of every kind of standard of BBU and send to corresponding radio frequency unit.
Described main control unit comprises: FPGA, D/A conversion unit, AD conversion unit and power supply, wherein, FPGA links to each other with D/A conversion unit, AD conversion unit, D/A conversion unit, AD conversion unit link to each other with each radio frequency unit, power supply links to each other with FPGA and each radio frequency unit, be used to provide power for operation, wherein
FPGA is used for obtaining baseband signal and sending to BBU after FPGA handles carrying out from the digital signal of AD conversion unit; To carry out sending to D/A conversion unit after FPGA handles from the baseband signal of every kind of standard of BBU;
AD conversion unit, the conversion of signals from each radio frequency unit that is used for receiving are to send to FPGA after the digital signal to handle;
D/A conversion unit is used for sending to corresponding radio frequency unit after digital signal with FPGA is converted to analog signal.
Radio frequency unit among Fig. 5 specifically can adopt execution mode shown in Figure 3, and the radio frequency unit among Fig. 6 specifically can adopt execution mode shown in Figure 4 to repeat no more here.
In the scheme of the foregoing description, can adopt duplexer as filter unit, thereby the radio frequency of realizing FDD system different frequency range zoom out scheme, does not also need to increase the outside and closes pipeline equipment.
Referring to shown in Figure 7, present embodiment is the radio system at multi-modulation scheme, and this system comprises frequency mixer 71, main control unit 73 and a plurality of radio frequency unit 72.Wherein,
Frequency mixer 71, the signal that is used for all radio frequency units that will receive carry out frequency and close the road and handle, and the signal that will close after handle on the road is launched by antenna; To carry out frequency by the signal that antenna receives along separate routes, and every road signal that will obtain sends to corresponding radio frequency unit.
Each radio frequency unit 72, the signal that is used for receiving frequency mixer 71 carries out sending to main control unit after amplification filtering, the down-converted; Be used for to modulate from the signal of master control unit, send to frequency mixer 71 after the up-conversion, processing and amplifying.
Main control unit 73 is used for providing power for operation to each radio frequency unit; With the conversion of signals of receiving from each radio frequency unit is digital signal, and data-signal is carried out obtaining baseband signal after FPGA handles, and sends to BBU; To carry out being converted to analog signal after FPGA handles from the baseband signal of every kind of standard of BBU and send to corresponding radio frequency unit.
Present embodiment can solve the problem that existing base station system need be supported multi-modulation scheme with many moneys RRU, optimizes the design of 3G (Third Generation) Moblie base station system, does not need to increase the outside and closes pipeline equipment.
Specific embodiment one
Present embodiment is a system schema of supporting the radio system (is example with two antennas) of multiband multi-modulation scheme, and block diagram is shown in Fig. 8 a and Fig. 8 b:
Fig. 8 a is depicted as the radio system situation of the support multi-modulation scheme multiband that directly is connected with different systems BBU; Fig. 8 b is depicted as the radio system that two single fibers are supported TDD and FDD simultaneously, and corresponding BBU also needs to support simultaneously TDD and FDD.
Shown in Fig. 8 a and Fig. 8 b, be divided into wide frequency antenna, main control unit, radio frequency unit, filter unit, power module.
1) wide frequency antenna
Covering wide frequency range 1.8-2.6G can cover existing TD-SCDMA, TD-LTE, FDD frequency range, forms two antennas, four antennas, eight aerial arrays etc. according to system's needs, to satisfy the antenna gain demand of different system.
2) filter unit
Filter unit is divided three classes according to the different system demand, and a kind of is filter, and a kind of is duplexer, and a kind of is that three frequencies close the road.Under the pattern of TDD,, adopt Filter Design because identical frequency is adopted in transmitting-receiving; Under the pattern of FDD,, adopt the design of duplexer because different frequencies is adopted in transmitting-receiving; Support two kinds of standards of FDD and TDD simultaneously, employing be three frequently to close the design on road.
Filter unit is finished the effect that reduces transmit scattering and suppress to block, and directly links to each other with antenna, can change with different frequency needs according to different standard demands.Under the frequency resource that broad-band antenna covers, filter unit can be designed to identical structure and interface according to the frequency configuration of different system, be convenient for changing.
Under the pattern of TDD, adopt Filter Design, filter is used for the signal between radio frequency unit and antenna is advanced Filtering Processing.
When supporting two kinds of standards at the same time, the signal that filter unit is used for all radio frequency units that will receive carries out frequency and closes the road and handle, and the signal that will close after handle on the road is launched by antenna; To carry out frequency by the signal that antenna receives along separate routes, and every road signal that will obtain sends to corresponding radio frequency unit.
Under the pattern of FDD, adopt the design of duplexer, duplexer is used to transmit the signal between radio frequency unit and antenna.
3) radio-frequency module
Radio-frequency module is divided into two classes according to different systems, is respectively fdd mode and tdd mode.Identical frequency is adopted in the tdd mode transmitting-receiving, switches according to different time slots.Different frequencies is adopted in the fdd mode transmitting-receiving, receives and sends out and work simultaneously.
Fig. 9 a and Fig. 9 b are respectively the radio-frequency module schematic diagrames of tdd mode and fdd mode.
Shown in Fig. 9 a, the radio-frequency module of tdd mode comprises: transmitter unit, switch unit, DPD feedback unit and receiving element.Wherein,
Transmitter unit is the specific implementation of above-mentioned transmitter unit shown in Figure 3, comprising: modulating unit 91, amplifier 92, filter 93, power amplifier 94.Modulating unit 91 is used for the signal that receives is modulated; Amplifier 92 is used for and will carries out processing and amplifying through the information after the modulators modulate; Filter 93 is used for and will carries out up-conversion through the signal after the processing and amplifying; Power amplifier 94 is used for and will carries out sending filter unit after the power amplification through the signal after the upconversion process.
The DPD feedback unit comprises: filter 95, amplifier 96, frequency mixer 97, attenuator (PAD) 98 and coupler 99.Wherein, coupler 99 signal of power amplifier output of described transmitter unit that is used for being coupled; The signal that PAD98 is used for being coupled to carries out matching attenuation to be handled; Frequency mixer 97 is used to carry out down-conversion, and amplifier is used for the signal of frequency mixer output is amplified; Filter 95 is used for that the signal of receiving is carried out feeding back to main control unit after the Filtering Processing and carries out data processing.
Receiving element comprises: first filter 10, variable attenuation amplifier 11, frequency mixer 12, the second filters 13, LNA 14 and switch 15.Wherein, switch 15 is used for control from the main control unit received signal; LNA 14 is low noise amplifier, and the signal that is used for receiving carries out low noise and amplifies; The signal that second filter is used for receiving carries out Filtering Processing; Frequency mixer, 12 signals that are used for receiving carry out down-converted, and the signal that is about to receive down-converts to intermediate frequency; Variable attenuation amplifier 11 is used for amplifying carrying out low noise through the signal after the Filtering Processing; First filter 10, the signal after the process down-converted that is used for receiving carries out sending to main control unit after the Filtering Processing; Switch 15, the reception that is used to control receiving element whether.
Shown in Fig. 9 b, the radio-frequency module of fdd mode is an instantiation embodiment illustrated in fig. 4, comprising: transmitter unit, DPD feedback unit and receiving element.Wherein,
Transmitter unit comprises: modulating unit 91, amplifier 92, filter 93, power amplifier 94.Modulating unit 91 is used for the signal that receives is modulated; Amplifier 92 is used for and will carries out processing and amplifying through the information after the modulators modulate; Filter 93 is used for and will carries out up-conversion through the signal after the processing and amplifying; Power amplifier 94 is used for and will carries out sending filter unit after the power amplification through the signal after the upconversion process.
The DPD feedback unit comprises: filter 95, amplifier 96, frequency mixer 97, attenuator (PAD) 98 and coupler 99.Wherein, coupler 99 signal of power amplifier output of described transmitter unit that is used for being coupled; The signal that PAD98 is used for being coupled to carries out matching attenuation to be handled; Frequency mixer 97 is used to carry out down-conversion, and amplifier is used for the signal of frequency mixer output is amplified; Filter 95 is used for that the signal of receiving is carried out feeding back to main control unit after the Filtering Processing and carries out data processing.
Receiving element comprises: first filter 10, variable attenuation amplifier 11, frequency mixer 12, the second filters 13 and LNA 14.Wherein, switch 15 is used for control from the main control unit received signal; LNA 14 is low noise amplifier, and the signal that is used for receiving carries out low noise and amplifies; The signal that second filter is used for receiving carries out Filtering Processing; Frequency mixer, 12 signals that are used for receiving carry out down-converted, and the signal that is about to receive down-converts to intermediate frequency; Variable attenuation amplifier 11 is used for amplifying carrying out low noise through the signal after the Filtering Processing; First filter 10, the signal after the process down-converted that is used for receiving carries out sending to main control unit after the Filtering Processing.
Owing to adopt the TDD time division duplex, there is not transmitting-receiving frequency at interval.Referring to shown in Figure 10, taking TDD-LTE is example, and a TDD-LTE subframe is made up of 7 time slots, two transfer points, and one is fixing point, another position can be provided with flexibly.Time slot before this movable transfer point is ascending time slot (at least first), and time slot afterwards is descending time slot (at least last).The system physical channel adopts 4 layers of structure: system-frame, radio frames, subframe and time slot are formed.The long radio frames of each 10ms can be divided into the subframe of 2 5ms, and each subframe is divided into a plurality of time slots again.Each subframe can be divided into 7 conventional time slots and 3 special time slots that length is 675us.Conventional time slot comprises data division and Timeslot Interval (clear position), and three special time slots are realized synchronously and defencive function, comprise DwPTS, GP and UpPTS.
A protection interval GP (guard period) requires a DL/UL or UL/DL transfer point. and each business time-slot all comprises the conversion of a bit of idling cycle (Timeslot Interval) user's uplink downlink..
Switch according to time slot, the amplifier on the corresponding receiving-transmitting chain can be when non operating state powered-down, effectively save energy consumption.
No matter be TDD or fdd mode, all comprise transmitting chain, receive link and DPD feedback loop.
Emission TX path mainly comprises direct modulator, driving amplifier, final stage power amplifier, circulator, isolator and coupler etc., mainly finishes the signal of launching is carried out up-conversion and signal is carried out enlarging function.Isolator mainly is to isolate final stage power amplifier and driving amplifier, with the protection power amplifier; Coupler is mainly used to coupling and transmits and offer the DPD feedback network.
Receive the RX path and mainly comprise high power switch, high power load, LNA, amplifier, Surface Acoustic Wave Filter, frequency mixer etc., major function is that the received signal of antenna opening input is carried out amplification filtering and is down-converted to intermediate frequency.Under the pattern of TDD, high power switch is used to isolate the TX path and reflects back into the signal that receives path from antenna opening.
The DPD feedback network mainly feeds back and transmits and the antenna port reflects signal.Transmitting that coupling is gone back offers baseband analyzer, improves the characteristic that transmits of system by the DPD function; The antenna port reflects signal is used to calculate the standing wave of antenna port, the standing wave state in monitoring RRU antenna exit.
4) main control unit
Main control unit is finished the conversion of radio frequency and numeral, carries out digital processing simultaneously, finishes communication with BBU by optical fiber.Realizing the baseband extension agreement, mainly is to realize communicating by letter with the base station indoor unit by fiber transmission link, receives and transmission I/Q baseband signal, and handles corresponding O﹠amp by MCU; M information; Under the pattern of TDD, produce the control signal of TD time slot according to the control information of main carrier, offer transceiver, switch matrix satisfies time slot control signal and the switching signal that 3GPP requires; Realize that power detection and standing-wave ratio detect; Support the detection of power interface; Support online upgrading ability; Support local operation to safeguard and the research and development test; Finish the DDC+DUC+CFR+DPD processing capacity;
Support TDD and two kinds of standards of FDD simultaneously by software.Adopt the scheme 1 of Optical Fiber Transmission different systems respectively, can effectively utilize the BBU in the existing network, do not need redesign.Directly adopt the scheme 2 of an Optical Fiber Transmission TDD and two kinds of standard data of FDD, need to be connected with the BBU that supports FDD and TDD simultaneously, BBU needs redesign, optimizes network configuration.
5) power module
Power module provides power supply for main control unit and radio-frequency module, supports AC, DC input, and different electrical power power capacity according to different scene needs design series modules.
The form that power module can be used as module directly is installed on the main control unit or independent the installation, changes according to different scene needs.
The system of the embodiment of the invention supports different systems and different frequency range, filter cell directly links to each other with antenna by cable, save the installation of outside mixer, can reduce because of closing the Insertion Loss that bring on the road, optimize network performance, close the equipment on road owing to reduced the outside simultaneously, can increase the reliability of system.And, can also be in use to two antennas, four antennas or eight antenna systems, make many antennas TDD and FDD base station system obtain same performance optimization, simplify effects such as project installation.Also can be in use to multisystems such as TD-SCDMA and TDD-LTE, the shared antenna scheme of TD-SCDMA and TDD-LTE is simplified.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (10)
1. a radio system is characterized in that, this system comprises: filter unit, main control unit and at least two radio frequency units, and each radio frequency unit links to each other with filter unit with main control unit respectively,
Filter unit, the signal that is used for all radio frequency units that will receive closes road and filtering, and filtered signal is launched by antenna together; To carry out shunt, filtering by the signal that antenna receives, and every road signal that will obtain sends to corresponding radio frequency unit;
Each radio frequency unit, the signal that is used for receiving described filter unit carries out sending to main control unit after amplification filtering, the down-converted; Be used for to modulate from the signal of master control unit, send to filter unit after the up-conversion, processing and amplifying;
Main control unit is used for providing power for operation to each radio frequency unit; With the conversion of signals of receiving from each radio frequency unit is digital signal, and data-signal is carried out obtaining baseband signal after FPGA handles, and sends to baseband processing unit BBU; To carry out being converted to analog signal after FPGA handles from the baseband signal of BBU and send to corresponding radio frequency unit.
2. system according to claim 1 is characterized in that, when each radio frequency unit all adopted the TDD standard, then described filter unit was a filter.
3. system according to claim 1 is characterized in that, when each radio frequency unit all adopted the FDD standard, then described filter unit was a duplexer.
4. system according to claim 1 is characterized in that, corresponding two or more network formats in described at least two radio frequency units, and then described filter unit is the frequency mixer.
5. the system as claimed in claim 1, it is characterized in that, described main control unit comprises: FPGA, D/A conversion unit, AD conversion unit and power supply, wherein, FPGA links to each other with D/A conversion unit, AD conversion unit, and D/A conversion unit, AD conversion unit link to each other with each radio frequency unit, power supply links to each other with FPGA and each radio frequency unit, be used to provide power for operation, wherein
FPGA is used for obtaining baseband signal and sending to BBU after FPGA handles carrying out from the digital signal of AD conversion unit; To carry out sending to D/A conversion unit after FPGA handles from the baseband signal of BBU;
AD conversion unit, the conversion of signals from each radio frequency unit that is used for receiving are to send to FPGA after the digital signal to handle;
D/A conversion unit is used for the digital signal from FPGA is converted to and sends to corresponding radio frequency unit after the analog signal.
6. the system as claimed in claim 1 is characterized in that, when radio frequency unit adopts the TDD network formats, comprises switch unit, transmitter unit, digital pre-distortion technology DPD feedback unit and receiving element, wherein,
Switch unit is used for according to the system time gap configuration information transmitter unit and receiving element alternately being communicated with antenna respectively;
Transmitter unit, be used for the signal that receives modulate, processing and amplifying, and the signal after the processing and amplifying carried out up-conversion, will carry out sending filter unit after the power amplification through the signal after the upconversion process;
The DPD feedback unit, the signal that the described transmitter unit that is used to be coupled sends, and the signal that is coupled to carried out after matching attenuation handles, carry out down-conversion, amplification, Filtering Processing after the feedback main control unit carry out data processing;
Receiving element, the signal that is used for receiving carries out sending to main control unit after low noise amplification, filtering and the down-converted.
7. system as claimed in claim 6 is characterized in that, described switch unit is used for the time slot signal according to TDD transceiving switch-over control signal navigation system, and receives and dispatches switching controls according to described time slot signal.
8. system as claimed in claim 7 is characterized in that, described switch unit is used for when the transmitting-receiving switching controls, shifts to an earlier date the switching point that corresponding Timing Advance control transmitting-receiving is switched according to constant time lag.
9. the system as claimed in claim 1 is characterized in that, when radio frequency unit adopts the FDD network formats, comprises transmitter unit, DPD feedback unit and receiving element, wherein,
Transmitter unit, be used for the signal that receives modulate, processing and amplifying, and the signal after the processing and amplifying carried out up-conversion, will carry out sending filter unit after the power amplification through the signal after the upconversion process;
The DPD feedback unit, the signal that the described transmitter unit that is used to be coupled sends, and the signal that is coupled to carried out after matching attenuation handles carries out feeding back to main control unit after down-conversion, amplification, the Filtering Processing and carries out data processing;
Receiving element, the signal that is used for receiving carries out sending to main control unit after low noise amplification, filtering and the down-converted.
10. system as claimed in claim 6 is characterized in that, described switch unit is a circulator.
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