CN103067319A - Method, device and system of up signal processing - Google Patents
Method, device and system of up signal processing Download PDFInfo
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- CN103067319A CN103067319A CN2012105719106A CN201210571910A CN103067319A CN 103067319 A CN103067319 A CN 103067319A CN 2012105719106 A CN2012105719106 A CN 2012105719106A CN 201210571910 A CN201210571910 A CN 201210571910A CN 103067319 A CN103067319 A CN 103067319A
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Abstract
The invention discloses a method, a device and a system of up signal processing. The main content of method, the device and the system of the up signal processing is that amplified analog intermediate frequency signals are transformed to multi-channel digital sub-band base band signals by an up digital base band processor, a carrier-noise-ratio of each channel digital sub-band base band signal carries out noise suppression of the channel digital sub-band base band signals, and each channel digital sub-band base band signal after noise suppression is transformed to an analog intermediate frequency signal and output to an analog up converter. According to the method, the device and the system of the up signal processing, due to the fact that one hand, up radio-frequency signals are amplified by utilization of an up low-noise amplifier, and on the other hand, each channel digital sub-band base band signal is in noise suppression respectively by the up base band processor, the up radio-frequency signals are amplified and meanwhile noise is suppressed, and floor noise of a base station is effectively reduced.
Description
Technical field
The present invention relates to communication technical field, relate in particular to a kind of upward signal processing method, equipment and system.
Background technology
The mobile communication base station can be divided into three parts basically: travelling carriage, wireless access network and core net.Wherein, wireless access network comprises radio network controller and base station (NodeB).Base station signal is shot out signal amplitude by antenna-feedback system, the coverage goal zone.But the unavoidable chlamydate weak district of base station coverage mode, blind area, this mobile communication base station of day by day improving for quality of service requirement is a general difficult problem.Long Term Evolution (Long Term Evolution, LTE) the LTE trunk amplifier is introduced base station signal, with its amplification, the coverage goal zone, thereby can enlarge the LTE base station range, eliminate coverage hole, solve the covering problem of indoor or special screne, this generally uses higher frequency band more than the 2GHz to seem in the LTE system and is even more important.
For this reason, introduced a kind of new extension soverlay technique in 3GPP agreement LTE Rel-8 version, be called relaying (Relay) technology, its equipment is called via node Relay Node(RN).The Relay technology of 3GPP agreement LTE Rel-8 version definition is divided into three kinds, is respectively a layer 1Relay(L1Relay), layer 2Relay(L2Relay) and layer 3Relay(L3Relay).
Wherein, layer 1Relay equipment is also referred to as analog machine, above-mentioned LTE trunk amplifier namely belongs to this analog machine, but existing LTE trunk amplifier directly amplifies the radiofrequency signal (comprising useful signal and noise) that receives, although have advantages of that the time delay that equipment is simple, cost is low and introduce is little, but owing to simultaneously useful signal and interference are amplified and transmit, when amplifying useful signal, also amplified noise, therefore, exist the end of lifting base station to make an uproar, have a strong impact on up covering and up throughput.
Summary of the invention
The embodiment of the invention provides a kind of upward signal processing method, equipment and system, the problem of making an uproar at the bottom of the lifting base station in amplifying signal in order to solve the LTE trunk amplifier that exists in the prior art.
A kind of upward signal processing method is applied to comprise in the LTE indoor active compartment system:
Determine the carrier-to-noise ratio of each railway digital sub-band baseband signal of being converted to by up LTE radiofrequency signal, and the carrier-to-noise ratio of each the railway digital sub-band baseband signal that will determine and the carrier-to-noise ratio threshold value of setting compare;
When comparative result during less than the carrier-to-noise ratio threshold value set, turn-offs this carrier-to-noise ratio less than the sending time slots of the digital sub-band baseband signal of the carrier-to-noise ratio threshold value of setting for the carrier-to-noise ratio determined; When comparative result was not less than the carrier-to-noise ratio threshold value of setting for the carrier-to-noise ratio of determining, the digital sub-band baseband signal that this carrier-to-noise ratio is not less than the carrier-to-noise ratio threshold value of setting sent by up link.
A kind of upward signal treatment facility is applied to comprise in the LTE indoor active compartment system:
Determination module is for the carrier-to-noise ratio of each railway digital sub-band baseband signal of determining to be converted to by up LTE radiofrequency signal;
Comparison module is used for the carrier-to-noise ratio of each railway digital sub-band baseband signal that described determination module is definite and the carrier-to-noise ratio threshold value of setting and compares;
Noise suppression module is used for the comparative result according to described comparison module, when comparative result during less than the carrier-to-noise ratio threshold value set, turn-offs this carrier-to-noise ratio less than the sending time slots of the digital sub-band baseband signal of the carrier-to-noise ratio threshold value of setting for the carrier-to-noise ratio determined; When comparative result was not less than the carrier-to-noise ratio threshold value of setting for the carrier-to-noise ratio of determining, the digital sub-band baseband signal that this carrier-to-noise ratio is not less than the carrier-to-noise ratio threshold value of setting sent by up link.
A kind of uplink baseband processor, this uplink baseband processor are applied in the LTE indoor active compartment system, comprise modulus a/d transducer, Digital Down Convert DDC device, carrier-to-noise ratio Ec/Io decision circuit, Digital Up Convert DUC device and digital-to-analogue D/A converter, wherein:
A/D converter is used for carrying out modulus A/D conversion to carried out the analog if signal that down-conversion obtains by up LTE radiofrequency signal, exports the multi-path digital sub-band intermediate-freuqncy signal that obtains to the DDC device;
The DDC device is used for respectively each railway digital sub-band intermediate-freuqncy signal being carried out Digital Down Convert and processes, and exports the multi-path digital sub-band baseband signal that obtains to the Ec/Io decision circuit;
The Ec/Io decision circuit, be used for determining the carrier-to-noise ratio of each railway digital sub-band baseband signal, and the carrier-to-noise ratio of each the railway digital sub-band baseband signal that will determine and the carrier-to-noise ratio threshold value of setting compare, when comparative result during less than the carrier-to-noise ratio threshold value set, turn-offs this carrier-to-noise ratio less than the sending time slots of the digital sub-band baseband signal of the carrier-to-noise ratio threshold value of setting for the carrier-to-noise ratio determined; When comparative result was not less than the carrier-to-noise ratio threshold value of setting for the carrier-to-noise ratio of determining, the digital sub-band baseband signal that this carrier-to-noise ratio is not less than the carrier-to-noise ratio threshold value of setting exported the DUC device to;
The DUC device is used for that the digital sub-band baseband signal that receives is carried out Digital Up Convert and processes, and obtains corresponding digital sub-band intermediate-freuqncy signal and exports D/A converter to;
D/A converter is used for each railway digital sub-band intermediate-freuqncy signal is carried out digital-to-analogue conversion, and will obtain analog if signal and export the simulation upconverter to.
A kind of upward signal treatment system is applied to comprise in the LTE indoor active compartment system: up low noise amplifier, analog down converter, uplink baseband processor and simulation upconverter;
Described up low noise amplifier be used for the signal amplitude of the up radiofrequency signal that receives is amplified, and the up radiofrequency signal after will amplifying exports analog down converter to;
Described analog down converter is used for the up radiofrequency signal of up low noise amplifier output is carried out down-conversion, and exports the analog if signal that obtains to the uplink baseband processor;
Described uplink baseband processor, be used for changing the analog if signal of analog down converter output into multi-path digital sub-band baseband signal, determine the carrier-to-noise ratio of each railway digital sub-band baseband signal, and the carrier-to-noise ratio of each the railway digital sub-band baseband signal that will determine and the carrier-to-noise ratio threshold value of setting compare, when comparative result during less than the carrier-to-noise ratio threshold value set, turn-offs this carrier-to-noise ratio less than the sending time slots of the digital sub-band baseband signal of the carrier-to-noise ratio threshold value of setting for the carrier-to-noise ratio determined; When comparative result is not less than the carrier-to-noise ratio threshold value of setting for the carrier-to-noise ratio of determining, after changing analog if signal into, the digital sub-band baseband signal that this carrier-to-noise ratio is not less than the carrier-to-noise ratio threshold value of setting exports the simulation upconverter to;
Described simulation upconverter is used for the analog if signal of uplink baseband processor output is carried out up-conversion, and with the radiofrequency signal output that obtains.
The upward signal processing method that the embodiment of the invention provides, equipment and system, owing to utilizing up low noise amplifier that up radiofrequency signal is amplified on the one hand, radiofrequency signal after will amplifying on the other hand changes multi-path digital sub-band baseband signal into, and according to the carrier-to-noise ratio of each railway digital sub-band baseband signal this railway digital sub-band baseband signal is carried out noise suppressed, and export after changing each the railway digital sub-band baseband signal after the noise suppressed into radiofrequency signal, therefore, in the amplification that realizes up radiofrequency signal, also realized the inhibition to noise, make an uproar in the end that effectively reduces the base station, thereby promoted the uplink receiving sensitivity of base station, and greatly improved up covering and up throughput, reduced network construction cost.
Description of drawings
The flow chart of a kind of upward signal processing method that Fig. 1 provides for the embodiment of the invention one;
Fig. 2 is the structural representation of a kind of upward signal treatment facility of the embodiment of the invention two;
Fig. 3 is the structural representation of a kind of uplink baseband processor of the embodiment of the invention three;
The structural representation of a kind of upward signal treatment system that Fig. 4 provides for the embodiment of the invention four;
Fig. 5 is the networking structure schematic diagram of the upward signal treatment system in the embodiment of the invention four;
Fig. 6 is the structural representation of the upward signal treatment system of the FDD system that is applied in the embodiment of the invention four;
Fig. 7 is the structural representation of the upward signal treatment system of the TDD system that is applied in the embodiment of the invention four.
Embodiment
The problem of when amplifying useful signal, making an uproar at the bottom of the lifting base station in order to solve the LTE trunk amplifier that exists in the prior art, the embodiment of the invention provides a kind of upward signal processing method, equipment and system, after up radiofrequency signal is amplified, up radiofrequency signal after amplifying is converted to multi-path digital sub-band baseband signal, and each railway digital sub-band baseband signal carried out noise suppressed according to carrier/interface ratio, and change the multi-path digital sub-band baseband signal after the noise suppressed into radiofrequency signal output, therefore, effectively avoided the problem of making an uproar at the bottom of the lifting base station.
Need to prove, the upstream noise that relates in the embodiment of the invention suppresses to be based on OFDMA(Orthogonal Frequency Division Multiple Access OFDM) principle processes, and based on SC-FDMA(Single-carrier Frequency-Division Multiple Access, single-carrier frequency division multiple access) principle processes.
Describe in detail below in conjunction with the scheme of accompanying drawing to the embodiment of the invention.
Embodiment one:
As shown in Figure 1, be the flow chart of a kind of upward signal processing method of the embodiment of the invention one, the method is applied in the LTE indoor active compartment system, and described method comprises:
Step 101: receive to up LTE radiofrequency signal amplify, the analog if signal of analog down after processing.
Described up LTE radiofrequency signal can be the user terminal emission, also can be that the previous stage trunking sends, and this is not limited here.
Particularly, in step 101, by the up LTE radiofrequency signal that covers or reception antenna receives from the space, obtain up radiofrequency signal behind the filtering unwanted signal;
Up radiofrequency signal is amplified the amplitude of up radiofrequency signal through low noise amplifier, and through after the analog down processing, becomes analog if signal.
Step 102: the analog if signal that receives is carried out modulus A/D conversion and Digital Down Convert processing, obtain multi-path digital sub-band baseband signal.
Particularly, in step 102, the analog if signal that receives carried out A/D converter sampling after, become multi-path digital sub-band intermediate-freuqncy signal;
Multi-path digital sub-band intermediate-freuqncy signal obtains multi-path digital sub-band baseband signal after carrying out down-converted through Digital Down Convert (Digital Down Converter, DDC) device.
Need to prove, the number of subcarriers of the described digital sub-band baseband signal that obtains will be determined according to base station configuration and real network situation, not limit the number of subcarriers of sub-band baseband signal here.
Step 103: the carrier-to-noise ratio of determining each railway digital sub-band baseband signal.
Particularly, in step 103, the method for the carrier-to-noise ratio of described definite each railway digital sub-band baseband signal includes but not limited to:
According to the intensity level of the suffered interference signal of the intensity level of digital sub-band baseband signal and digital sub-band baseband signal, calculate the carrier-to-noise ratio of each railway digital sub-band baseband signal, i.e. the ratio of Ec and Io;
Wherein, the intensity level of Ec representative digit sub-band baseband signal, the intensity level of the interference signal that Io representative digit sub-band baseband signal is suffered.
Wherein, the carrier-to-noise ratio threshold value of described setting is 1 ~ 20dB.
More preferably, the carrier-to-noise ratio threshold value of described setting is 9dB.
Need to prove, the carrier-to-noise ratio threshold value of described setting can be made amendment according to the evolution of LTE standard, also can arrange according to actual needs, is not specifically limited here.
Step 104: the carrier-to-noise ratio of each the railway digital sub-band baseband signal that will determine and the carrier-to-noise ratio threshold value of setting compare, when comparative result for the carrier-to-noise ratio determined during less than the carrier-to-noise ratio threshold value set, execution in step 105; When comparative result is not less than the carrier-to-noise ratio threshold value of setting for the carrier-to-noise ratio of determining, execution in step 106.
Particularly, in step 104, the method that the carrier-to-noise ratio threshold value of the carrier-to-noise ratio of each railway digital sub-band baseband signal of determining and setting is compared includes but not limited to:
Make difference operation between the carrier-to-noise ratio threshold value with the carrier-to-noise ratio of each railway digital sub-band baseband signal of determining and setting, the difference and 0 that obtains is compared, when difference is not less than 0, determine that described definite carrier-to-noise ratio is not less than the carrier-to-noise ratio threshold value of setting; When difference less than 0 the time, determine that described definite carrier-to-noise ratio is less than the carrier-to-noise ratio threshold value of setting.
Step 105: turn-off this carrier-to-noise ratio less than the sending time slots of the digital sub-band baseband signal of the carrier-to-noise ratio threshold value of setting.
In step 105, turn-off this carrier-to-noise ratio and mean the digital sub-band baseband signal filtering of this carrier-to-noise ratio less than the carrier-to-noise ratio threshold value of setting less than the sending time slots of the digital sub-band baseband signal of the carrier-to-noise ratio threshold value of setting, effective like this noise jamming suffered when having reduced carrier-to-noise ratio and being not less than the digital sub-band base band signal transmission of carrier-to-noise ratio threshold value of setting.
Step 106: the digital sub-band baseband signal that this carrier-to-noise ratio is not less than the carrier-to-noise ratio threshold value of setting sends by up link.
In this step 106, can send to according to the digital sub-band baseband signal that actual conditions are not less than this carrier-to-noise ratio the carrier-to-noise ratio threshold value of setting the trunking of base station or rear one-level by up link.
Particularly, in step 106, the digital sub-band baseband signal that this carrier-to-noise ratio is not less than the carrier-to-noise ratio threshold value of setting is carried out the filtering processing via digital filter, and the spurious signal that produces in the filtering comparison procedure obtains filtered digital sub-band baseband signal;
Digital sub-band baseband signal after the described filtering spurious signal is carried out Digital Up Convert (Digital Up Converter successively, DUC) processing and digital-to-analogue conversion are processed, obtain analog if signal and send to the simulation upconverter, the signal after by the simulation upconverter this analog if signal being processed and will be processed sends to the base station.
So namely realized upward signal is carried out noise suppressed, namely only up useful signal has been amplified processing, so that the noise level of the up access signal in base station is lower than-123dBm/100KHz.
Scheme by the embodiment of the invention one, increase the operation that the carrier-to-noise ratio threshold value to digital sub-band baseband signal carrier-to-noise ratio and setting compares in the uplink direction, carrier-to-noise ratio is carried out the shutoff operation less than the sending time slots of the digital sub-band base station signal of the carrier-to-noise ratio threshold value of setting, and the digital sub-band baseband signal that only carrier-to-noise ratio is not less than the carrier-to-noise ratio threshold value of setting is sent to the base station by up link, so that only up useful signal is amplified, and the digital sub-band baseband signal of carrier-to-noise ratio less than the carrier-to-noise ratio threshold value of setting suppressed, thereby effectively avoided the defective of making an uproar and being lifted at the bottom of the base station, promoted the uplink receiving sensitivity of base station, and greatly improved up covering and up throughput, reduced network construction cost.
Embodiment two:
As shown in Figure 2, structural representation for a kind of upward signal treatment facility of the embodiment of the invention two, the embodiment of the invention two is and the equipment of the embodiment of the invention one under same design, this equipment is applied in the LTE indoor active compartment system, described equipment comprises: determination module 11, comparison module 12 and noise suppression module 13, wherein:
Particularly, described determination module 11, concrete carrier-to-noise ratio for calculating each railway digital sub-band baseband signal is the ratio of Ec and Io;
Wherein, the intensity level of Ec representative digit sub-band baseband signal, the intensity level of the interference signal that Io representative digit sub-band baseband signal is suffered.
Particularly, described noise suppression module 13 specifically comprises: digital filtering unit 21, Digital Up Convert unit 22, D/A conversion unit 23 and shutoff unit 24, wherein:
Digital Up Convert unit 22 is used for that described filtered digital sub-band baseband signal is carried out Digital Up Convert and processes, and obtains digital medium-frequency signal;
D/A conversion unit 23 is used for digital medium-frequency signal is carried out digital-to-analogue conversion, obtains analog if signal, and this analog if signal is sent to the simulation upconverter;
Turn-off unit 24, be used for turn-offing carrier-to-noise ratio that comparing unit relatively obtains less than the sending time slots of the digital sub-band baseband signal of the carrier-to-noise ratio threshold value of setting.
Need to prove, the embodiment of the invention two described upward signal treatment facilities can be the logical blocks with above-mentioned module, can also be the physical entities that can realize above-mentioned functions, are not specifically limited here.
Embodiment three:
As shown in Figure 3, be the structural representation of a kind of uplink baseband processor 30 of the embodiment of the invention three.This uplink baseband processor is applied in the LTE indoor active compartment system, comprises modulus a/d transducer 31, Digital Down Convert DDC device 32, Digital Up Convert DUC device 33, carrier-to-noise ratio Ec/Io decision circuit 34 and D/A converter 35, wherein:
A/D converter 31 is connected with Digital Down Convert DDC device, is used for carrying out modulus A/D conversion to carried out the analog if signal that down-conversion obtains by up LTE radiofrequency signal, exports the multi-path digital sub-band intermediate-freuqncy signal that obtains to the DDC device;
Ec/Io decision circuit 34, with Digital Up Convert DUC equipment connection, be used for determining the carrier-to-noise ratio of each railway digital sub-band baseband signal, and the carrier-to-noise ratio of each the railway digital sub-band baseband signal that will determine and the carrier-to-noise ratio threshold value of setting compare, when comparative result during less than the carrier-to-noise ratio threshold value set, turn-offs this carrier-to-noise ratio less than the sending time slots of the digital sub-band baseband signal of the carrier-to-noise ratio threshold value of setting for the carrier-to-noise ratio determined; When comparative result was not less than the carrier-to-noise ratio threshold value of setting for the carrier-to-noise ratio of determining, the digital sub-band baseband signal that this carrier-to-noise ratio is not less than the carrier-to-noise ratio threshold value of setting exported the DUC device to;
D/A converter 35 is used for each railway digital sub-band intermediate-freuqncy signal is carried out digital-to-analogue conversion, and will obtain analog if signal and export the simulation upconverter to.
Better, described uplink baseband processor also comprises:
This uplink baseband processor can adopt field programmable gate array (Field-Programmable Gate Array, FPGA), CPLD (Complex Programmable Logic Device, CPLD) any one and in three kinds of technology of Digital Signal Processing (Digital Signal Processing, DSP), two kinds or whole combinations realize.
Need to prove, the carrier-to-noise ratio Ec/Io decision circuit that comprises in the embodiment of the invention three described uplink baseband processors can be the logical block that has identical function with the embodiment of the invention two described upward signal treatment facilities, also can be to have the physical equipment that the embodiment of the invention two described upward signal treatment facilities have identical function, for example: carrier-to-noise ratio Ec/Io decision circuit comprises a computing unit, a comparison circuit and a selection circuit, wherein, computing unit is for the carrier-to-noise ratio of determining each digital sub-band baseband signal; Comparison circuit compares for the carrier-to-noise ratio of each the railway digital sub-band baseband signal that will determine and the carrier-to-noise ratio threshold value of setting; Select circuit, be used for triggering different equipment according to comparative result, be not specifically limited here.
In arbitrary system that uplink baseband processor in the embodiment of the invention three can be applied to use OFDMA and SC-FDMA to carry out the multiple access access, the system that the existing OFDMA of utilization and SC-FDMA carry out the multiple access access is the LTE system, comprise Frequency Division Duplexing (FDD) long evolving system (Long Term Evolution-Frequency Division Duplexing, LTE-FDD or FDD-LTE), senior Frequency Division Duplexing (FDD) long evolving system (the Long Term Evolution-Frequency Division Duplexing Advance of system, LTE-FDD Advance or FDD-LTE Advance), time division duplex long evolving system (Long TermEvolution – Time Division Duplexing, LTE-TDD or TDD-LTE or TD-LTE), senior time division duplex long evolving system (Long Term Evolution-Time Division Duplexing Advance, LTE-TDD Advance or TDD-LTE Advance or TD-LTE Advance).Based on above-mentioned uplink baseband processor, the embodiment of the invention four also provides a kind of upward signal treatment system, is described in detail below by embodiment four.
Embodiment four
As shown in Figure 4, the structural representation of the upward signal treatment system that provides for the embodiment of the invention four, be applied in the LTE indoor active compartment system, comprise: the up low noise amplifier (Low Noise Amplifier, LNA) 41 that connects successively, analog down converter 42, uplink baseband processor 43, simulation upconverter 44;
Described up low noise amplifier 41 be used for the signal amplitude of the up radiofrequency signal that receives is amplified, and the up radiofrequency signal after will amplifying exports analog down converter 42 to;
Described analog down converter 42 is used for the up radiofrequency signal of up low noise amplifier 41 outputs is carried out down-conversion, and exports the analog if signal that obtains to uplink baseband processor 43;
Described uplink baseband processor 43, be used for changing the analog if signal of analog down converter output into multi-path digital sub-band baseband signal, determine the carrier-to-noise ratio of each railway digital sub-band baseband signal, and the carrier-to-noise ratio of each the railway digital sub-band baseband signal that will determine and the carrier-to-noise ratio threshold value of setting compare, when comparative result during less than the carrier-to-noise ratio threshold value set, turn-offs this carrier-to-noise ratio less than the sending time slots of the digital sub-band baseband signal of the carrier-to-noise ratio threshold value of setting for the carrier-to-noise ratio determined; When comparative result is not less than the carrier-to-noise ratio threshold value of setting for the carrier-to-noise ratio of determining, after changing analog if signal into, the digital sub-band baseband signal that this carrier-to-noise ratio is not less than the carrier-to-noise ratio threshold value of setting exports simulation upconverter 44 to;
Described simulation upconverter 44 is used for the analog if signal of uplink baseband processor 43 outputs is carried out up-conversion, and with the radiofrequency signal output that obtains.
The upward signal treatment system that above-mentioned up low noise amplifier (Low Noise Amplifier, LNA) 41, analog down converter 42, uplink baseband processor 43, simulation upconverter 44 by connecting successively consists of is processed the up radiofrequency signal in the up link.
Because up radiofrequency signal is when arriving the uplink baseband processor, experienced the transmission course of complicated electromagnetic space, therefore, the noise that up radiofrequency signal contains is larger, if it is not carried out the processing of noise suppressed, can make an uproar at the larger end of raising the base station, and for downlink radio-frequency signal, that the base station is transferred to corresponding downstream signal treatment system with it, therefore, there is not the problem of making an uproar at the bottom of the base station of raising, therefore, the embodiment of the invention four does not limit the structure for the downstream signal treatment system that the downlink radio-frequency signal of down link is processed, optionally, the structure of the downstream signal treatment system that being used in the embodiment of the invention four processes the downlink radio-frequency signal of down link can comprise the analog down converter 45 shown in the dotted line frame of Fig. 4, downgoing baseband processor 46, simulation upconverter 47 and descending amplifier (Amplifier, AMP) 48.And be used for each device that the downlink radio-frequency signal of down link is processed function can with the present embodiment four in be used for to the up radiofrequency signal of up link process device function class seemingly, no longer it is given unnecessary details here.
Because when the upward signal treatment system of the embodiment of the invention four is amplified up radiofrequency signal, the noise that has suppressed signal, therefore, making an uproar in the end that effectively reduces the base station, and then with respect to prior art, utilizes the scheme of the embodiment of the invention four, the base station can upward signal treatment system in parallel more, as shown in Figure 5, improve greatly the uplink receiving sensitivity of base station simultaneously, reduce the construction cost of network.
In addition, the LTE trunk amplifier of prior art is made an uproar to the up gain of the artificial reduction of the interference of base station for reducing the end, thereby so that the unbalanced defective of network coverage up-downgoing, and the upward signal treatment system in the embodiment of the invention four, owing to effectively reducing the noise of up link, make an uproar at the bottom of having reduced the base station, thereby can reduce up gain, and then effectively avoided the unbalanced defective of network coverage up-downgoing.
In arbitrary system that upward signal treatment system in the embodiment of the invention four can be applied to use OFDMA and SC-FDMA to carry out the multiple access access, the system that the existing OFDMA of utilization and SC-FDMA carry out the multiple access access is the LTE system, comprise Frequency Division Duplexing (FDD) long evolving system (Long Term Evolution-Frequency Division Duplexing, LTE-FDD or FDD-LTE), senior Frequency Division Duplexing (FDD) long evolving system (the Long Term Evolution-Frequency Division Duplexing Advance of system, LTE-FDD Advance or FDD-LTE Advance), time division duplex long evolving system (Long Term Evolution – Time Division Duplexing, LTE-TDD or TDD-LTE or TD-LTE), senior time division duplex long evolving system (Long Term Evolution-Time Division Duplexing Advance, LTE-TDD Advance or TDD-LTE Advance or TD-LTEAdvance), therefore the scheme of the embodiment of the invention four can be applied to said system, below by the scheme of embodiment five detailed protocol that the scheme of the embodiment of the invention four is applied to said system is described.
Embodiment five
As shown in Figure 6, be the structural representation of the upward signal treatment system that is used for LTE-FDD or FDD-LTE, LTE-FDD Advance or FDD-LTE Advance.Wherein, this upward signal treatment system is on the basis of the structure of the upward signal treatment system shown in Figure 4 of embodiment four, also comprise: MT end duplexer 40 and DT end duplexer 49, and be connected to the upstream amplifier 50 of simulating between upconverter 44 and the DT end duplexer 49;
Described MT end duplexer 40 is used for the up radiofrequency signal that receives is carried out filtering, exports filtered up radiofrequency signal to up low noise amplifier 41;
Described upstream amplifier (Amplifier, AMP) 50 amplifies for the signal amplitude of the radiofrequency signal that the simulation upconverter is exported, and the radiofrequency signal after will amplifying exports DT end duplexer 49 to;
Described DT end duplexer 49 is used for the radiofrequency signal of upstream amplifier output is carried out filtering, and exports filtered radiofrequency signal to base station.
As shown in Figure 7, be the structural representation of the upward signal treatment system that is used for LTE-TDD or TDD-LTE or TD-LTE, LTE-TDD Advance or TDD-LTE Advance or TD-LTE Advance.On the basis of upward signal treatment system shown in Figure 4, described upward signal treatment system also comprises: the first filter 60, DT end circulator 61, upstream amplifier 62, MT end circulator 63 and the second filter 64;
Described upstream amplifier 62 amplifies for the signal amplitude of the up radiofrequency signal that simulation upconverter 44 is exported, and the up radiofrequency signal after will amplifying exports DT end circulator 61 to;
Described DT end circulator 61 is used for exporting the up radiofrequency signal of upstream amplifier 62 outputs to first filter 60;
Described the first filter 60 is used for the up radiofrequency signal of DT end circulator 61 outputs is carried out filtering, and exports filtered up radiofrequency signal to base station;
Described the second filter 64 is used for the up radiofrequency signal that receives terminal equipment by covering/reception antenna from the space is carried out filtering, exports filtered up radiofrequency signal to MT end circulator 63;
Described MT end circulator 63 is used for exporting from the up radiofrequency signal of the second filter 64 up low noise amplifier 41 to.
The embodiment of the invention five does not limit the structure that is used for the downlink radio-frequency signal of down link is processed shown in Fig. 6, the structure that is used for the downlink radio-frequency signal of down link is processed can be the device shown in the dotted line frame among Fig. 6, equally, the structure that is used for the downlink radio-frequency signal of down link is processed shown in Fig. 7 is not limited yet, its structure that is used for the downlink radio-frequency signal of down link is processed can be the device shown in the dotted line frame among Fig. 7, and the function of the device shown in the dotted line frame can be determined the device function that the up radiofrequency signal of up link is processed according to being used in the embodiment of the invention five.
The embodiment of the invention five is different for TDD and FDD system, the corresponding upward signal treatment system that has been respectively different system, and because upstream amplifier has carried out the amplification of signal amplitude again to the up radiofrequency signal that has suppressed noise, therefore, further improved the carrier-to-noise ratio of each the railway digital sub-band signal that comprises in the up radiofrequency signal, and then further improved the sensitivity of base station, increase the quantity of the upward signal treatment system of base station energy parallel connection, enlarged the coverage of base station.
Those skilled in the art should understand, embodiments of the invention can be provided as method, system or computer program.Therefore, the present invention can adopt complete hardware implementation example, complete implement software example or in conjunction with the form of the embodiment of software and hardware aspect.And the present invention can adopt the form of the computer program of implementing in one or more computer-usable storage medium (including but not limited to magnetic disc store, CD-ROM, optical memory etc.) that wherein include computer usable program code.
The present invention is that reference is described according to flow chart and/or the block diagram of method, equipment (system) and the computer program of the embodiment of the invention.Should understand can be by the flow process in each flow process in computer program instructions realization flow figure and/or the block diagram and/or square frame and flow chart and/or the block diagram and/or the combination of square frame.Can provide these computer program instructions to the processor of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing device producing a machine, so that the instruction of carrying out by the processor of computer or other programmable data processing device produces the device that is used for realizing in the function of flow process of flow chart or a plurality of flow process and/or square frame of block diagram or a plurality of square frame appointments.
These computer program instructions also can be stored in energy vectoring computer or the computer-readable memory of other programmable data processing device with ad hoc fashion work, so that the instruction that is stored in this computer-readable memory produces the manufacture that comprises command device, this command device is realized the function of appointment in flow process of flow chart or a plurality of flow process and/or square frame of block diagram or a plurality of square frame.
These computer program instructions also can be loaded on computer or other programmable data processing device, so that carry out the sequence of operations step producing computer implemented processing at computer or other programmable devices, thereby be provided for realizing the step of the function of appointment in flow process of flow chart or a plurality of flow process and/or square frame of block diagram or a plurality of square frame in the instruction that computer or other programmable devices are carried out.
Although described the preferred embodiments of the present invention, in a single day those skilled in the art get the basic creative concept of cicada, then can make other change and modification to these embodiment.So claims are intended to all changes and the modification that are interpreted as comprising preferred embodiment and fall into the scope of the invention.
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 (16)
1. a upward signal processing method is characterized in that, is applied to Long Term Evolution LTE indoor active compartment system, comprising:
Determine the carrier-to-noise ratio of each railway digital sub-band baseband signal of being converted to by up LTE radiofrequency signal, and the carrier-to-noise ratio of each the railway digital sub-band baseband signal that will determine and the carrier-to-noise ratio threshold value of setting compare;
When comparative result during less than the carrier-to-noise ratio threshold value set, turn-offs this carrier-to-noise ratio less than the sending time slots of the digital sub-band baseband signal of the carrier-to-noise ratio threshold value of setting for the carrier-to-noise ratio determined; When comparative result was not less than the carrier-to-noise ratio threshold value of setting for the carrier-to-noise ratio of determining, the digital sub-band baseband signal that this carrier-to-noise ratio is not less than the carrier-to-noise ratio threshold value of setting sent by up link.
2. the method for claim 1 is characterized in that, the described carrier-to-noise ratio of determining each railway digital sub-band baseband signal of being converted to by up LTE radiofrequency signal specifically comprises:
The carrier-to-noise ratio that calculates each railway digital sub-band baseband signal is the ratio of Ec and Io;
Wherein, the intensity level of Ec representative digit sub-band baseband signal, the intensity level of the interference signal that Io representative digit sub-band baseband signal is suffered.
3. the method for claim 1 is characterized in that, the carrier-to-noise ratio threshold value scope of described setting is 1dB ~ 20dB.
4. method as claimed in claim 3 is characterized in that, the carrier-to-noise ratio threshold value of described setting is 9dB.
5. method as claimed in claim 4, it is characterized in that, described when comparative result is not less than the carrier-to-noise ratio threshold value of setting for the carrier-to-noise ratio of determining, the digital sub-band baseband signal that this carrier-to-noise ratio is not less than the carrier-to-noise ratio threshold value of setting sends by up link, specifically comprises:
When comparative result is not less than the carrier-to-noise ratio threshold value of setting for the carrier-to-noise ratio of determining, the digital sub-band baseband signal that this carrier-to-noise ratio is not less than the carrier-to-noise ratio threshold value of setting is carried out the filtering processing via digital filter, the spurious signal that produces in the filtering comparison procedure obtains the digital sub-band baseband signal after the filtering spurious signal;
Digital sub-band baseband signal after the described filtering spurious signal is carried out Digital Up Convert processing and digital-to-analogue conversion successively to be processed, obtain analog if signal and send to the simulation upconverter, the signal after by the simulation upconverter this analog if signal being processed and will be processed sends.
6. the method for claim 1 is characterized in that, before the carrier-to-noise ratio of each railway digital sub-band baseband signal of determining to be converted to by up LTE radiofrequency signal, described method also comprises:
Receive up LTE radiofrequency signal, and this up LTE radiofrequency signal is amplified processing and analog down processing successively, obtain analog if signal;
The analog if signal that obtains is carried out analog-to-digital conversion process and Digital Down Convert successively process, obtain multi-path digital sub-band baseband signal.
7. a upward signal treatment facility is characterized in that, is applied to comprise in the Long Term Evolution LTE indoor active compartment system:
Determination module is for the carrier-to-noise ratio of each railway digital sub-band baseband signal of determining to be converted to by up LTE radiofrequency signal;
Comparison module is used for the carrier-to-noise ratio of each railway digital sub-band baseband signal that described determination module is definite and the carrier-to-noise ratio threshold value of setting and compares;
Noise suppression module is used for the comparative result according to described comparison module, when comparative result during less than the carrier-to-noise ratio threshold value set, turn-offs this carrier-to-noise ratio less than the sending time slots of the digital sub-band baseband signal of the carrier-to-noise ratio threshold value of setting for the carrier-to-noise ratio determined; When comparative result was not less than the carrier-to-noise ratio threshold value of setting for the carrier-to-noise ratio of determining, the digital sub-band baseband signal that this carrier-to-noise ratio is not less than the carrier-to-noise ratio threshold value of setting sent by up link.
8. equipment as claimed in claim 7 is characterized in that,
Described determination module, concrete carrier-to-noise ratio for calculating each railway digital sub-band baseband signal is the ratio of Ec and Io;
Wherein, the intensity level of Ec representative digit sub-band baseband signal, the intensity level of the interference signal that Io representative digit sub-band baseband signal is suffered.
9. equipment as claimed in claim 7 is characterized in that, described noise suppression module specifically comprises:
The digital filtering unit is used for that the digital sub-band baseband signal that this carrier-to-noise ratio is not less than the carrier-to-noise ratio threshold value of setting is carried out filtering and processes, and the spurious signal that produces in the filtering comparison procedure obtains the digital sub-band baseband signal after the filtering spurious signal;
The Digital Up Convert unit is used for that described filtered digital sub-band baseband signal is carried out Digital Up Convert and processes, and obtains digital medium-frequency signal;
D/A conversion unit is used for digital medium-frequency signal is carried out digital-to-analogue conversion, obtains analog if signal, and this analog if signal is sent to the simulation upconverter;
Turn-off the unit, be used for turn-offing carrier-to-noise ratio that comparing unit relatively obtains less than the sending time slots of the digital sub-band baseband signal of the carrier-to-noise ratio threshold value of setting.
10. uplink baseband processor, it is characterized in that, this uplink baseband processor is applied to comprise modulus a/d transducer, Digital Down Convert DDC device, carrier-to-noise ratio Ec/Io decision circuit, Digital Up Convert DUC device and digital-to-analogue D/A converter in the Long Term Evolution LTE indoor active compartment system, wherein:
A/D converter is used for carrying out modulus A/D conversion to carried out the analog if signal that down-conversion obtains by up LTE radiofrequency signal, exports the multi-path digital sub-band intermediate-freuqncy signal that obtains to the DDC device;
The DDC device is used for respectively each railway digital sub-band intermediate-freuqncy signal being carried out Digital Down Convert and processes, and exports the multi-path digital sub-band baseband signal that obtains to the Ec/Io decision circuit;
The Ec/Io decision circuit, be used for determining the carrier-to-noise ratio of each railway digital sub-band baseband signal, and the carrier-to-noise ratio of each the railway digital sub-band baseband signal that will determine and the carrier-to-noise ratio threshold value of setting compare, when comparative result during less than the carrier-to-noise ratio threshold value set, turn-offs this carrier-to-noise ratio less than the sending time slots of the digital sub-band baseband signal of the carrier-to-noise ratio threshold value of setting for the carrier-to-noise ratio determined; When comparative result was not less than the carrier-to-noise ratio threshold value of setting for the carrier-to-noise ratio of determining, the digital sub-band baseband signal that this carrier-to-noise ratio is not less than the carrier-to-noise ratio threshold value of setting exported the DUC device to;
The DUC device is used for that the digital sub-band baseband signal that receives is carried out Digital Up Convert and processes, and obtains corresponding digital sub-band intermediate-freuqncy signal and exports D/A converter to;
D/A converter is used for each railway digital sub-band intermediate-freuqncy signal is carried out digital-to-analogue conversion, and will obtain analog if signal and export the simulation upconverter to.
11. uplink baseband processor as claimed in claim 10 is characterized in that, described uplink baseband processor also comprises:
Digital filter, be used for when the comparative result of Ec/Io decision circuit is not less than the carrier-to-noise ratio threshold value of setting for the carrier-to-noise ratio of determining, the digital sub-band baseband signal that this carrier-to-noise ratio is not less than the carrier-to-noise ratio threshold value of setting is carried out the filtering processing, the spurious signal that produces in the filtering comparison procedure, the digital sub-band baseband signal that obtains after the filtering spurious signal exports the DUC device to.
12. such as the arbitrary described uplink baseband processor of claim 10 ~ 11, it is characterized in that, any one in described uplink baseband processor adopting on-site programmable gate array FPGA, complex programmable logic device (CPLD) or three kinds of technology of Digital Signal Processing DSP, two kinds or whole combinations realize.
13. such as the arbitrary described uplink baseband processor of claim 10 ~ 11, it is characterized in that, described uplink baseband processor is applied at least a system of Frequency Division Duplexing (FDD) long evolving system LTE-FDD or FDD-LTE, senior Frequency Division Duplexing (FDD) long evolving system LTE-FDD Advance or FDD-LTE Advance, time division duplex long evolving system LTE-TDD or TDD-LTE or TD-LTE, senior time division duplex long evolving system LTE-TDD Advance or TDD-LTE Advance or TD-LTE Advance.
14. a upward signal treatment system is applied to it is characterized in that in the Long Term Evolution LTE indoor active compartment system, comprising: up low noise amplifier, analog down converter, uplink baseband processor and simulation upconverter;
Described up low noise amplifier be used for the signal amplitude of the up radiofrequency signal that receives is amplified, and the up radiofrequency signal after will amplifying exports analog down converter to;
Described analog down converter is used for the up radiofrequency signal of up low noise amplifier output is carried out down-conversion, and exports the analog if signal that obtains to the uplink baseband processor;
Described uplink baseband processor, be used for changing the analog if signal of analog down converter output into multi-path digital sub-band baseband signal, determine the carrier-to-noise ratio of each railway digital sub-band baseband signal, and the carrier-to-noise ratio of each the railway digital sub-band baseband signal that will determine and the carrier-to-noise ratio threshold value of setting compare, when comparative result during less than the carrier-to-noise ratio threshold value set, turn-offs this carrier-to-noise ratio less than the sending time slots of the digital sub-band baseband signal of the carrier-to-noise ratio threshold value of setting for the carrier-to-noise ratio determined; When comparative result is not less than the carrier-to-noise ratio threshold value of setting for the carrier-to-noise ratio of determining, after changing analog if signal into, the digital sub-band baseband signal that this carrier-to-noise ratio is not less than the carrier-to-noise ratio threshold value of setting exports the simulation upconverter to;
Described simulation upconverter is used for the analog if signal of uplink baseband processor output is carried out up-conversion, and with the radiofrequency signal output that obtains.
15. upward signal treatment system as claimed in claim 14 is characterized in that, described upward signal treatment system is applied to frequency division multiple access FDD system, and described upward signal treatment system also comprises: MT end duplexer, DT end duplexer and upstream amplifier;
Described MT end duplexer is used for the up radiofrequency signal that receives is carried out filtering, exports filtered up radiofrequency signal to up low noise amplifier;
Described upstream amplifier amplifies for the signal amplitude of the radiofrequency signal that the simulation upconverter is exported, and the radiofrequency signal after will amplifying exports DT end duplexer to;
Described DT end duplexer is used for the radiofrequency signal of upstream amplifier output is carried out filtering, and with filtered radiofrequency signal output.
16. upward signal treatment system as claimed in claim 14, it is characterized in that, described upward signal treatment system is applied to time division multiple access TDD system, and described upward signal treatment system also comprises: the first filter, DT end circulator, upstream amplifier, MT end circulator and the second filter;
Described upstream amplifier amplifies for the signal amplitude of the up radiofrequency signal that the simulation upconverter is exported, and the up radiofrequency signal after will amplifying exports DT end circulator to;
Described DT end circulator is used for exporting the up radiofrequency signal of upstream amplifier output to first filter;
Described the first filter is used for the up radiofrequency signal of DT end circulator output is carried out filtering, and with filtered up radiofrequency signal output;
Described the second filter is used for the up radiofrequency signal that receives is carried out filtering, exports filtered up radiofrequency signal to MT end circulator;
Described MT end circulator is used for and will exports up low noise amplifier to from the up radiofrequency signal of the second filter.
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