CN102238564B - Digital microwave remote coverage system and method - Google Patents
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Abstract
The invention provides a digital microwave remote coverage system and method. The system comprises a digital microwave access unit and a digital microwave coverage unit, wherein the digital microwave access unit is used for receiving a radio frequency (RF) signal of a base station, digitalizing the RF signal, then modulating the digital signal to the microwave frequency band and sending the signal to the digital microwave coverage unit, and is further used for receiving a microwave signal, carrying out microwave demodulation, digitalization and RF signal recovery and then sending the signal to the base station; and the digital microwave coverage unit is used for receiving the microwave signal, carrying out microwave demodulation, digitalization and RF signal recovery and then covering a mobile terminal with the signal, and is further used for receiving the RF signal of the mobile terminal, digitalizing the RF signal, then modulating the digital signal to the microwave frequency band and sending the signal to the digital microwave access unit. By adopting digitalization, the invention has the advantages of reproducibility and high antijamming capability, and can not cause noise superposition; and the signal of the base station is demodulated without being decoded, thus greatly reducing the transmission bandwidth and delay and greatly lowering the complexity and cost of the system.
Description
Technical field
The present invention relates to mobile communication and zoom out soverlay technique, relate in particular to a kind of digital microwave remote coverage system and method.
Background technology
At present, digital microwave radio remote unit coverage system mainly contains following two kinds:
The first is the digital microwave remote coverage system of shift frequency class, as application number is to disclose a kind of microwave zooming wireless shrouding system in 200910037387.7 application documents, and as shown in Figure 1, this system comprises:
Be used for to receive the radiofrequency signal of base station and convert microwave signal to and send through the microwave transmission unit, and receive the microwave signal that the microwave transmission unit transmits and convert radiofrequency signal to again to the inserting of microwave unit of base-station transmission;
Be used for carrying out the microwave transmission unit of microwave signal space transmission;
Be used for to receive the microwave signal that the microwave transmission unit transmits and convert emission of radio frequency signals to and go out and carry out zone covering, and the radiofrequency signal that transmits of receiving mobile and convert the micro-wave extension unit that microwave signal sends through the microwave transmission unit to.
But above-mentioned digital microwave shift frequency class far-drawing system, owing to having adopted the simulation frequency shift technique, the noise stack is serious, poor anti jamming capability, and affected by environment larger, seldom use in the market.
the second is the digital microwave remote coverage system of digitlization class, as shown in Figure 2, this digital microwave remote coverage system, comprise DAU (Digital Access Unit, the Digital Access unit), DRU (Digital Remote Unit, the digital long-drawn unit) and cover antenna, also comprise near-end microwave transmission unit and remote microwave transmission unit, described near-end microwave transmission unit and remote microwave transmission unit include IDU (InDoor Unit, indoor unit), ODU (OutDoor Unit, outdoor unit) and antenna, IDU and the ODU of described near-end microwave transmission unit, antenna connects successively, the antenna of described remote microwave transmission unit and ODU, IDU connects successively, the antenna of near-end microwave transmission unit and the antenna of remote microwave transmission unit adopt microwave to communicate, the IDU of described near-end microwave transmission unit adopts the standard base-station interface to be connected with DAU, and the IDU of described remote microwave transmission unit adopts the standard base-station interface to be connected with DRU, the IDU of described near-end microwave transmission unit and remote microwave transmission unit includes:
Modular converter, be used for mapping out digital radio signal and network management data from standard base-station interface frame solution, digital radio signal is compressed, then the digital radio signal after network management data and compression is mapped to microwave frame, and from map out through the microwave frame solution after digital demodulation network management data and the compression after digital radio signal, digital radio signal after this compression is carried out decompress(ion), then the digital radio signal after network management data and decompress(ion) is mapped to standard base-station interface frame;
Digital modems is used for microwave frame is carried out Digital Modulation or demodulation.
Above-mentioned the second digital microwave far-drawing system, adopt the mode of Direct Digital sampling obtain digital signal and transmit by digital microwave systems, but the data rate due to Direct Sampling in this system is very high, therefore cause the processing delay of system and practical bandwidth all very large, system is complex and costliness also, needs DAU+IDU * 2+ODU * 2+DRU can form one and covers transmission system.
Summary of the invention
For addressing the above problem, the invention provides a kind of digital microwave remote coverage system and method, can strengthen the antijamming capability and the complexity, cost, bandwidth and the time delay that reduce system of system.
A kind of digital microwave remote coverage system comprises:
The digital microwave access unit for the radiofrequency signal that receives the base station, carries out being modulated to microwave frequency band and sending to the digital microwave capping unit after digitized processing; And receive the microwave signal that described digital microwave capping unit sends, carry out sending to the base station after microwave demodulation, digitized processing and radiofrequency signal are recovered;
The digital microwave capping unit is used for receiving the microwave signal that described digital microwave access unit sends, and carries out microwave demodulation, digitized processing and radiofrequency signal and recovers backward mobile terminal covering; And the radiofrequency signal of mobile terminal receive, carry out being modulated to microwave frequency band and sending to described digital microwave access unit after digitized processing.
A kind of digital microwave zooms out covering method, comprises downlink transmission process and ul transmissions process;
Described downlink transmission process specifically comprises the steps:
The digital microwave access unit receives the radiofrequency signal of base station, carries out being modulated to microwave frequency band and sending to the digital microwave capping unit after digitized processing;
Described digital microwave capping unit receives the microwave signal that described digital microwave access unit sends, and carries out microwave demodulation, digitized processing and radiofrequency signal and recovers backward mobile terminal covering;
Described ul transmissions process specifically comprises the steps:
The radiofrequency signal of digital microwave capping unit mobile terminal receive carries out being modulated to microwave frequency band and sending to described digital microwave access unit after digitized processing;
Described digital microwave access unit receives the microwave signal that described digital microwave capping unit sends, and carries out sending to the base station after microwave demodulation, digitized processing and radiofrequency signal are recovered.
Can find out from above scheme, digital microwave remote coverage system of the present invention and method, that radiofrequency signal is carried out forming digital code stream after digital demodulation, then adopting digital microwave as transmission medium, digital code stream to be transmitted to realize covering zooms out, the benefit of bringing thus has two: the first, owing to having adopted digitized processing, have recyclability, therefore noiseless stack, antijamming capability is strong; Second, because the present invention carries out demodulation but do not carry out decode operation the signal of base station, the advantage that has not only kept Digital Transmission and overlay device, and greatly reduce transmission bandwidth and propagation delay time, also greatly reduce simultaneously complexity and the cost of system, have good market application foreground.
Description of drawings
Fig. 1 is the structural representation of the digital microwave remote coverage system of shift frequency class in prior art;
Fig. 2 is the structural representation of the digital microwave remote coverage system of digitlization class in prior art;
Fig. 3 is the flow chart that digital microwave of the present invention zooms out covering method;
Fig. 4 is the structural representation of digital microwave remote coverage system of the present invention;
Fig. 5 is the structural representation one of the digital microwave remote coverage system in specific embodiment;
Fig. 6 is the structural representation two of the digital microwave remote coverage system in specific embodiment.
Embodiment
The invention provides a kind of digital microwave remote coverage system and method, this system can solve that micro-wave extension covering system antijamming capability of the prior art is weak, the complexity of system and cost is high and transmission bandwidth and the large problem of propagation delay time.Describe embodiments of the invention in detail below in conjunction with accompanying drawing.
As shown in Figure 3, digital microwave remote radio covering method of the present invention comprises downlink transmission process and ul transmissions process;
(1) described downlink transmission process specifically comprises the steps:
Steps A, digital microwave access unit receive the radiofrequency signal of base station, carry out being modulated to microwave frequency band and sending to the digital microwave capping unit after digitized processing;
Step B, described digital microwave capping unit receive the microwave signal that described digital microwave access unit sends, and carry out microwave demodulation, digitized processing and radiofrequency signal and recover backward mobile terminal covering;
(2) described ul transmissions process specifically comprises the steps:
The radiofrequency signal of step a, digital microwave capping unit mobile terminal receive carries out being modulated to microwave frequency band and sending to described digital microwave access unit after digitized processing;
Step b, described digital microwave access unit receive the microwave signal that described digital microwave capping unit sends, and carry out sending to the base station after microwave demodulation, digitized processing and radiofrequency signal are recovered.
In above-mentioned steps A, described digital microwave access unit receives the radiofrequency signal of base station, the process of carrying out being modulated to after digitized processing microwave frequency band is specially: the digital microwave access unit receives the radiofrequency signal of base station, carry out being converted to digital signal after digitized processing, then be converted to intermediate-freuqncy signal, then be modulated to microwave frequency band.
In step B, described digital microwave capping unit receives the microwave signal that described digital microwave access unit sends, the process of carrying out microwave demodulation, digitized processing and radiofrequency signal recovery is specially: the digital microwave capping unit receives the microwave signal that described digital microwave access unit sends, be demodulated into intermediate-freuqncy signal, then be converted to digital signal after digitized processing, then recover to be converted to radiofrequency signal through radiofrequency signal.
In addition, in step a, the radiofrequency signal of described digital microwave capping unit mobile terminal receive, the process of carrying out being modulated to after digitized processing microwave frequency band is specially: the radiofrequency signal of digital microwave capping unit mobile terminal receive, carry out being converted to digital signal after digitized processing, then be converted to intermediate-freuqncy signal, then be modulated to microwave frequency band.
In step b, described digital microwave access unit receives the microwave signal that described digital microwave capping unit sends, the process of carrying out microwave demodulation, digitized processing and radiofrequency signal recovery is specially: the digital microwave access unit receives the microwave signal that described digital microwave capping unit sends, be converted to intermediate-freuqncy signal after demodulation, then be converted to digital signal after digitized processing, then recover to be converted to radiofrequency signal through radiofrequency signal.
To zoom out covering method corresponding with digital microwave of the present invention, and the present invention also provides a kind of digital microwave remote coverage system, as shown in Figure 4, comprising:
Digital microwave access unit DWAU (Digital Microwave Access Unit), radio frequency (RF) signal for receiving the base station carries out being modulated to microwave frequency band and sending to the digital microwave capping unit after digitized processing; And receive the microwave signal that described digital microwave capping unit sends, carry out sending to the base station after microwave demodulation, digitized processing and radiofrequency signal are recovered;
Digital microwave capping unit DWRU (Digital Microwave Remote Unit) is used for receiving the microwave signal that described digital microwave access unit sends, and carries out microwave demodulation, digitized processing and radiofrequency signal and recovers backward mobile terminal covering; And the radiofrequency signal of mobile terminal receive, carry out being modulated to microwave frequency band and sending to described digital microwave access unit after digitized processing.
As an embodiment preferably, described digital microwave access unit comprises the tape handling of near-end microwave-based and modem module IDU (also claiming indoor unit), near-end microwave radio processing unit ODU (also claiming outdoor unit); Wherein, cover antenna, the tape handling of near-end microwave-based and modem module IDU, near-end microwave radio processing unit ODU and microwave antenna are connected successively.
In addition, also can comprise remote microwave Base-Band Processing and modem module IDU, remote microwave RF processing unit ODU in described digital microwave capping unit; Wherein, microwave antenna, remote microwave RF processing unit ODU, remote microwave Base-Band Processing are connected successively with modem module IDU and cover antenna.
Need to prove, adopt microwave to communicate between the microwave antenna of the microwave antenna of digital microwave access unit and digital microwave capping unit.And the frequency of the microwave signal of transmitting between DWAR and DWRU can be 7GHz, 8GHz, 11GHz, 13GHz, 15GHz, 18GHz or 23GHz.
Further, the near-end microwave-based tape handling of digital microwave access unit of the present invention and modem module IDU can comprise near-end radio-frequency module, near-end modulation /demodulation module, near-end Digital Microwave modulation /demodulation module, near-end microwave ifd module; Wherein, described near-end radio-frequency module, near-end modulation /demodulation module, near-end Digital Microwave modulation /demodulation module and near-end microwave ifd module are connected successively, and concrete connection as shown in Figure 5.
In addition, also can comprise far-end RF module, far-end modulation /demodulation module, remote microwave digital modulation and demodulation module, remote microwave ifd module in described remote microwave Base-Band Processing and modem module IDU; Wherein, described far-end RF module, far-end modulation /demodulation module, remote microwave digital modulation and demodulation module and remote microwave ifd module are connected successively.
Preferably, the tape handling of described near-end microwave-based and modem module IDU also comprise the near-end monitoring module, and described near-end monitoring module is connected with described near-end radio-frequency module, near-end modulation /demodulation module, near-end Digital Microwave modulation /demodulation module, near-end microwave ifd module and near-end microwave radio processing unit ODU respectively;
Described remote microwave Base-Band Processing and modem module IDU also comprise the remote monitoring module, and described remote monitoring module is connected with described far-end RF module, far-end modulation /demodulation module, remote microwave digital modulation and demodulation module, remote microwave ifd module and remote microwave RF processing unit ODU respectively.
Preferably, the tape handling of described near-end microwave-based and modem module IDU also comprise the near-end power module, and described near-end power module is connected with described near-end radio-frequency module, near-end modulation /demodulation module, near-end Digital Microwave modulation /demodulation module, near-end microwave ifd module and near-end microwave radio processing unit ODU respectively;
Described remote microwave Base-Band Processing and modem module IDU also comprise the far end supply module, and described far end supply module is connected with described far-end RF module, far-end modulation /demodulation module, remote microwave digital modulation and demodulation module, remote microwave ifd module and remote microwave RF processing unit ODU respectively.
Digital microwave remote coverage system of the present invention can be applicable to the multiple systems such as gsm system, cdma system, WCDMA system, CDMA2000 system or TD-SCDMA system, and the below only describes specific works process of the present invention in detail with the example that is applied as on gsm system:
The downstream signal overwrite procedure of native system is as follows:
The near-end radio-frequency module of A, DWAU receives the simulation GSM radiofrequency signal that is coupled out from BTS, and sends to near-end modulation /demodulation module after being converted to digital radio signal;
The near-end modulation /demodulation module of B, DWAU is carried out demodulation (but not decoding) to digital radio signal, is converted into the digital signal of low speed (near GSM base band speed), sends to near-end digital microwave modulation /demodulation module;
Encoding digital signals and the modulation of near-end digital microwave modulation /demodulation module to receiving of C, DWAU, and the intermediate-freuqncy signal after modulating sends to near-end microwave ifd module;
The near-end microwave ifd module of D, DWAU carries out after the operations such as filtering, signal being sent to near-end microwave radio processing unit (ODU) after receiving intermediate-freuqncy signal after modulation;
The near-end ODU of E, DWAU is translated into microwave signal after receiving the intermediate-freuqncy signal that near-end microwave ifd module sends, and sends to the remote microwave RF processing unit (ODU) of DWRU by microwave antenna;
After the far-end ODU of F, DWRU receives microwave signal by microwave antenna, be converted into intermediate-freuqncy signal and send to the remote microwave ifd module;
The remote microwave ifd module of G, DWRU sends signal to remote digital microwave modulation /demodulation module after the intermediate-freuqncy signal that receives such as is filtered at the operation;
The remote digital microwave modulation /demodulation module of H, DWRU is decoded and demodulation to the received signal, then the digital signal after demodulation is sent to the far-end modulation /demodulation module of DWRU;
The digital signal modulated of the far-end modulation /demodulation module of I, DWRU after with the demodulation that receives becomes the GSM radiofrequency signal and sends to far-end RF module;
The far-end RF module of J, DWRU sends to the interior mobile terminal in zone with the radiofrequency signal that receives by cover antenna.
The uplink signal transmissions process of native system is as follows:
Be converted to digital radio signal and deliver to far-end modulation /demodulation module after the GSM analog radio-frequency signal of the far-end RF module of a, DWRU by mobile terminal in the cover antenna receiving area;
The far-end modulation /demodulation module of b, DWRU is carried out demodulation (but not decoding) to the digital radio signal that receives, and is converted into the digital signal of low speed (near GSM base band speed), sends to remote digital microwave modulation /demodulation module;
Encoding digital signals and the modulation of the remote digital microwave modulation /demodulation module of c, DWRU to receiving, and the intermediate-freuqncy signal after modulating sends to the remote microwave ifd module;
The remote microwave ifd module of d, DWRU carries out the intermediate-freuqncy signal that receives after the operations such as filtering, signal to be sent to remote microwave RF processing unit (ODU);
The far-end ODU of e, DWRU is converted into the intermediate-freuqncy signal that receives the near-end microwave radio processing unit (ODU) that sends it to DWAU after microwave signal by microwave antenna;
The near-end ODU of f, DWAU is translated into intermediate-freuqncy signal after receiving radiofrequency signal by microwave antenna, sends to near-end microwave ifd module;
The near-end microwave ifd module of g, DWAU carries out the intermediate-freuqncy signal that receives after the operations such as filtering, signal to be sent to near-end digital microwave modulation /demodulation module;
The near-end digital microwave modulation /demodulation module of h, DWAU is decoded and demodulation to the intermediate-freuqncy signal that receives, and then the digital signal after demodulation is sent to near-end modulation /demodulation module;
The near-end modulation /demodulation module of i, DWAU becomes the digital signal modulated that receives the GSM radiofrequency signal and sends to the near-end radio-frequency module;
The near-end radio-frequency module of j, DWAU sends to the GSM base station with the radiofrequency signal that receives by cover antenna.
Can find out by above scheme, digital microwave remote coverage system of the present invention and method, radiofrequency signal is carried out digital demodulation but do not form digital code stream after decode operation, then adopt digital microwave as transmission medium, digital code stream to be transmitted to realize to zoom out covering, this way has not only kept Digital Transmission and the strong advantage of overlay device antijamming capability, and greatly reduce transmission bandwidth and propagation delay time, also greatly reduce complexity and the cost of system simultaneously.The below compares the present invention and prior art and further to define advantage of the present invention and beneficial effect:
One, the processing of the present invention by signal only being carried out demodulation but not decoding, only take the GSM radiofrequency signal as example, the transmission capacity of digital microwave can be lowered into 1/30 of the second digital microwave remote coverage system, this greatly reduces complexity and cost and the time delay of digital microwave transmission system;
Two, the present invention compared with prior art requires lowlyer to the transmission capacity of digital microwave, therefore can adopt the Digital Microwave modulation demodulation system of lower-order, and this will promote the reliability, transmission range etc. of digital microwave systems greatly;
Three, the present invention adopts digitized processing, has reduced the algorithm for design of each inside, unit, thereby has simplified the complexity of system, has just solved problems such as transmitting covering by two processing units, makes the cost of whole system, and installs simple, easy to maintenance.
Above-described embodiment of the present invention does not consist of the restriction to protection range of the present invention.Any modification of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in claim protection range of the present invention.
Claims (5)
1. a digital microwave remote coverage system, is characterized in that, comprising:
The digital microwave access unit for the radiofrequency signal that receives the base station, carries out being modulated to microwave frequency band and sending to the digital microwave capping unit after digitized processing; And receive the microwave signal that described digital microwave capping unit sends, carry out sending to the base station after microwave demodulation, digitized processing and radiofrequency signal are recovered;
The digital microwave capping unit is used for receiving the microwave signal that described digital microwave access unit sends, and carries out microwave demodulation, digitized processing and radiofrequency signal and recovers backward mobile terminal covering; And the radiofrequency signal of mobile terminal receive, carry out being modulated to microwave frequency band and sending to described digital microwave access unit after digitized processing;
Described digital microwave access unit comprises the tape handling of near-end microwave-based and modem module IDU, near-end microwave radio processing unit ODU; Wherein, cover antenna, the tape handling of near-end microwave-based and modem module IDU, near-end microwave radio processing unit ODU and microwave antenna are connected successively;
Described digital microwave capping unit comprises remote microwave Base-Band Processing and modem module IDU, remote microwave RF processing unit ODU; Wherein, microwave antenna, remote microwave RF processing unit ODU, remote microwave Base-Band Processing are connected successively with modem module IDU and cover antenna;
The tape handling of described near-end microwave-based and modem module IDU comprise near-end radio-frequency module, near-end modulation /demodulation module, near-end Digital Microwave modulation /demodulation module, near-end microwave ifd module; Wherein, described near-end radio-frequency module, near-end modulation /demodulation module, near-end Digital Microwave modulation /demodulation module and near-end microwave ifd module are connected successively;
Described remote microwave Base-Band Processing and modem module IDU comprise far-end RF module, far-end modulation /demodulation module, remote microwave digital modulation and demodulation module, remote microwave ifd module; Wherein, described far-end RF module, far-end modulation /demodulation module, remote microwave digital modulation and demodulation module and remote microwave ifd module are connected successively;
The downstream signal overwrite procedure of described digital microwave remote coverage system is as follows:
The near-end radio-frequency module receives the analog radio-frequency signal that is coupled out from BTS, and sends to near-end modulation /demodulation module after being converted to digital radio signal; Near-end modulation /demodulation module is carried out demodulation to digital radio signal but the processing of not decoding, and is converted into the digital signal of low speed, sends to near-end digital microwave modulation /demodulation module; Encoding digital signals and the modulation of near-end digital microwave modulation /demodulation module to receiving, and the intermediate-freuqncy signal after modulating sends to near-end microwave ifd module; Near-end microwave ifd module carries out after filtering operation, signal being sent to near-end microwave radio processing unit after receiving intermediate-freuqncy signal after modulation; Near-end microwave radio processing unit is translated into microwave signal after receiving the intermediate-freuqncy signal that near-end microwave ifd module sends, and sends to described remote microwave RF processing unit by microwave antenna; After the remote microwave RF processing unit receives microwave signal by microwave antenna, be converted into intermediate-freuqncy signal and send to the remote microwave ifd module; The remote microwave ifd module carries out the intermediate-freuqncy signal that receives to send signal to remote digital microwave modulation /demodulation module after filter operation; Remote digital microwave modulation /demodulation module is decoded and demodulation to the received signal, then the digital signal after demodulation is sent to far-end modulation /demodulation module; The digital signal modulated of far-end modulation /demodulation module after with the demodulation that receives becomes radiofrequency signal and sends to far-end RF module; Far-end RF module sends to the interior mobile terminal in zone with the radiofrequency signal that receives by cover antenna;
The uplink signal transmissions process of described digital microwave remote coverage system is as follows:
Be converted to digital radio signal and deliver to far-end modulation /demodulation module after the analog radio-frequency signal of far-end RF module by mobile terminal in the cover antenna receiving area; Far-end modulation /demodulation module is carried out demodulation but the processing of not decoding to the digital radio signal that receives, and is converted into the digital signal of low speed, sends to remote digital microwave modulation /demodulation module; Encoding digital signals and the modulation of remote digital microwave modulation /demodulation module to receiving, and the intermediate-freuqncy signal after modulating sends to the remote microwave ifd module; The remote microwave ifd module carries out the intermediate-freuqncy signal that receives after filtering operation, signal to be sent to the remote microwave RF processing unit; The remote microwave RF processing unit sends it to near-end microwave radio processing unit by microwave antenna after the intermediate-freuqncy signal that receives is converted into microwave signal; Near-end microwave radio processing unit is translated into intermediate-freuqncy signal after receiving radiofrequency signal by microwave antenna, sends to near-end microwave ifd module; Near-end microwave ifd module carries out the intermediate-freuqncy signal that receives after filtering operation, signal to be sent to near-end digital microwave modulation /demodulation module; Near-end digital microwave modulation /demodulation module is decoded and demodulation to the intermediate-freuqncy signal that receives, and then the digital signal after demodulation is sent to near-end modulation /demodulation module; Near-end modulation /demodulation module becomes the digital signal modulated that receives radiofrequency signal and sends to the near-end radio-frequency module; The near-end radio-frequency module sends to the base station with the radiofrequency signal that receives by cover antenna.
2. digital microwave remote coverage system as claimed in claim 1 is characterized in that:
The tape handling of described near-end microwave-based and modem module IDU also comprise the near-end monitoring module, and described near-end monitoring module is connected with described near-end radio-frequency module, near-end modulation /demodulation module, near-end Digital Microwave modulation /demodulation module, near-end microwave ifd module and near-end microwave radio processing unit ODU respectively;
Described remote microwave Base-Band Processing and modem module IDU also comprise the remote monitoring module, and described remote monitoring module is connected with described far-end RF module, far-end modulation /demodulation module, remote microwave digital modulation and demodulation module, remote microwave ifd module and remote microwave RF processing unit ODU respectively.
3. digital microwave remote coverage system as claimed in claim 1 is characterized in that:
The tape handling of described near-end microwave-based and modem module IDU also comprise the near-end power module, and described near-end power module is connected with described near-end radio-frequency module, near-end modulation /demodulation module, near-end Digital Microwave modulation /demodulation module, near-end microwave ifd module and near-end microwave radio processing unit ODU respectively;
Described remote microwave Base-Band Processing and modem module IDU also comprise the far end supply module, and described far end supply module is connected with described far-end RF module, far-end modulation /demodulation module, remote microwave digital modulation and demodulation module, remote microwave ifd module and remote microwave RF processing unit ODU respectively.
4. as claim 1 or 2 or 3 described digital microwave remote coverage systems, it is characterized in that, the frequency of microwave signal is 7GHz, 8GHz, 11GHz, 13GHz, 15GHz, 18GHz or 23GHz.
5. as claim 1 or 2 or 3 described digital microwave remote coverage systems, it is characterized in that, be applicable to gsm system, cdma system, WCDMA system, CDMA2000 system or TD-SCDMA system.
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