CN102917398B - A kind of up-downgoing demodulation method of testing, Apparatus and system - Google Patents

Abstract

The invention discloses a kind of up-downgoing demodulation method of testing, Apparatus and system, relate to the communication technology, channel simulation equipment is after the signal receiving RRU or the transmission of network side signal handling equipment, signal after the process of this signal is determined according to the channel circumstance of simulation, again signal after this process is sent to the equipment of opposite side, i.e. signal handling equipment or RRU.Owing to not re-using the channel simulator be arranged between RRU and UE, but between RRU and network side signal handling equipment, the mode being arranged through software process determines to process the channel simulation equipment of rear signal, realize the simulation to channel circumstance, improve under the channel simulation condition of indoor, the efficiency of up-downgoing demodulation test.

Description

A kind of up-downgoing demodulation method of testing, Apparatus and system

Technical field

The present invention relates to the communication technology, particularly relate to a kind of up-downgoing demodulation method of testing, Apparatus and system.

Background technology

Carrying out LTE(Long Term Evolution, Long Term Evolution) field testing of up-downgoing demodulation time, the emphasis that service feature under different transmission mode is normally tested, in order to can testing process be simplified, improve testing efficiency, before carrying out actual field testing, usually need first under the condition of the channel simulation of indoor, to carry out corresponding test and debugging.

But channel simulation Environmental costs are higher, build complexity and not easy care, the efficiency of impact test.

In LTE system, the up-downgoing business demodulation performance checking thinking under different transmission mode is substantially identical.Connect at least 2 channel simulators (channel simulator is one direction transfer of data) between the base station and the terminal, affect the demodulation coding of uplink and downlink data respectively.By channel model identical for uplink-downlink configuration, the up-downgoing demodulation performance of the system of obtaining just can be tested.As shown in Figure 1, RRU (Remote Radio Unit, far-end radio-frequency apparatus) and UE(User Equipment, subscriber equipment) between by channel simulator simulates channel circumstance, realize the test under the condition of indoor channel simulation.For connecting 8 channel bank simulator structures of radio frequency interface case shown in Fig. 2 a, Fig. 2 b is depicted as the 8 channel simulator structures of channel without radio frequency interface case.

Visible, at present under the channel simulation condition of indoor, when carrying out up-downgoing demodulation test, need use 2 channel simulators, test environment is complicated, need a large amount of auxiliary materials, further, in order to ensure up-downgoing channel real-time matching that channel simulator arranges and synchronous, frequent calibrated meter is needed, complicated operation, and then cause testing efficiency lower.

Summary of the invention

The embodiment of the present invention provides a kind of up-downgoing demodulation method of testing, Apparatus and system, to improve under the channel simulation condition of indoor, and the efficiency of up-downgoing demodulation test.

A kind of up-downgoing demodulation method of testing, comprising:

Channel simulation equipment receives the signal of far-end radio-frequency apparatus RRU or the transmission of network side signal handling equipment;

Channel simulation equipment, according to described signal and the channel circumstance of simulating, determines signal after the required process exported;

Signal after channel simulation equipment exports described process to network side signal handling equipment or RRU.

A kind of up-downgoing demodulation testing apparatus, comprising:

Receiving element, for receiving the signal of far-end radio-frequency apparatus RRU or the transmission of network side signal handling equipment;

Processing unit, for according to described signal and the channel circumstance of simulating, determines signal after the required process exported;

Output unit, for signal after exporting described process to network side signal handling equipment or RRU.

A kind of up-downgoing demodulation test macro, comprising:

User equipment (UE) and the RRU be connected by cable with UE, the channel simulation equipment be connected with described RRU, and the network side signal handling equipment connecting described channel simulation equipment, wherein:

Described channel simulation equipment is used for, and receives the signal of RRU or the transmission of network side signal handling equipment; According to described signal and the channel circumstance of simulating, determine signal after the required process exported; And signal after exporting described process to network side signal handling equipment or RRU.

The embodiment of the present invention provides a kind of up-downgoing demodulation method of testing, Apparatus and system, channel simulation equipment is after the signal receiving RRU or the transmission of network side signal handling equipment, signal after the process of this signal is determined according to the channel circumstance of simulation, again signal after this process is sent to the equipment of opposite side, i.e. signal handling equipment or RRU.Owing to not re-using the channel simulator be arranged between RRU and UE, but between RRU and network side signal handling equipment, the mode being arranged through software process determines to process the channel simulation equipment of rear signal, realize the simulation to channel circumstance, improve under the channel simulation condition of indoor, the efficiency of up-downgoing demodulation test.

Accompanying drawing explanation

Fig. 1 is the system schematic of carrying out up-downgoing demodulation test in prior art;

Fig. 2 a is the 8 channel bank simulator structure schematic diagrames connecting radio frequency interface case in prior art;

Fig. 2 b be in prior art channel without 8 channel simulator structural representations of radio frequency interface case;

The up-downgoing demodulation method of testing flow chart that Fig. 3 provides for the embodiment of the present invention;

The system configuration schematic diagram of the up-downgoing demodulation test that Fig. 4 provides for the embodiment of the present invention;

Fig. 5 is Doppler effect motion state schematic diagram in the embodiment of the present invention;

The multipath signal decay simulation schematic diagram that Fig. 6 provides for the embodiment of the present invention;

The up-downgoing demodulation testing apparatus structural representation that Fig. 7 provides for the embodiment of the present invention;

The up-downgoing demodulation test system structure schematic diagram that Fig. 8 provides for the embodiment of the present invention.

Embodiment

The embodiment of the present invention provides a kind of up-downgoing demodulation method of testing, Apparatus and system, channel simulation equipment is after the signal receiving RRU or the transmission of network side signal handling equipment, signal after the process of this signal is determined according to the channel circumstance of simulation, again signal after this process is sent to the equipment of opposite side, i.e. signal handling equipment or RRU.Owing to not re-using the channel simulator be arranged between RRU and UE, but between RRU and network side signal handling equipment, the mode being arranged through software process determines to process the channel simulation equipment of rear signal, realize the simulation to channel circumstance, improve under the channel simulation condition of indoor, the efficiency of up-downgoing demodulation test.

As shown in Figure 3, the up-downgoing demodulation method of testing that the embodiment of the present invention provides, comprising:

Step S301, channel simulation equipment receive the signal of RRU or the transmission of network side signal handling equipment;

Step S302, channel simulation equipment, according to signal and the channel circumstance of simulating, determine signal after the required process exported;

Step S303, channel simulation equipment are to signal after network side signal handling equipment or RRU output processing.

Because channel simulation equipment is according to signal and the channel circumstance of simulating, determine signal after the required process exported, then signal after sending this process to the equipment of opposite side, thus realize the simulation to environment.

Concrete, channel simulation equipment determines this step of signal after the required process exported, can be realized by software, according to received signal and the channel circumstance of simulating, signal after the process exported required for can calculating, then to the signal after network side signal handling equipment or RRU output processing.

As shown in Figure 4, channel simulation equipment is arranged between RRU and network side signal handling equipment, UE with RRU can be connected by cable, thus the loss reduced between UE and RRU, in the diagram, channel simulation equipment is arranged on RRU and PL(Physical Layer, physical layer) between, according to setting in advance, channel simulation equipment can according to the signal received and the channel circumstance of simulating, signal after the process exported required for determining, thus the simulation realized channel, channel simulation equipment also can be when needed, after directly making the required process exported, signal equals the signal received, do not carry out the simulation to channel.

Concrete, in step S302 channel simulation equipment according to signal and the channel circumstance of simulating, to determine after the required process exported, before signal, also to comprise: determine that signal demand is through channel circumstance process.

When channel simulation equipment is determined to need to simulate channel, step S302 specifically comprises:

Channel simulation equipment according to the multipath number preset, the multipath fading factor, each footpath postpone and each footpath average power, determine need export process after signal.

Concrete, channel simulation equipment postpones and each footpath average power according to the multipath number preset, the multipath fading factor, each footpath, determines to need signal after the process of output, specifically comprises:

After channel simulation equipment determines the process needing to export, signal is:

$y\left(t\right)=\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{a}_i\·\exp (j\·2\mathrm{\π}(f_c+f_d)\·t)\·s(t-{\mathrm{\τ}}_i)=s\left(t\right)*h(t,\mathrm{\τ})$

Wherein, $h(t,\mathrm{\τ})=\mathrm{\δ}(t-{\mathrm{\τ}}_i\left(t\right))\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{a}_i\exp \left(j2\mathrm{\π}(f_c+f_d)t\right),$ N is multipath number, a _ibe the decay factor of i-th multipath, f _cfor carrier frequency, f _dfor Doppler frequency shift, τ _ibe the time delay of i-th multipath, s (t) represents convolution for the envelope that transmits, *, and h (t, τ) is channel impulse response, exp(x) e is represented ^x.

Because mobile or reflector motion produce Doppler effect, as shown in Figure 5, can by movement velocity and the angle calcu-lation Doppler shift between sports platform and transmitting station, Doppler frequency shift is:

$f_d=\frac{1}{2\mathrm{\π}}\frac{\mathrm{\Δ\φ}}{\mathrm{\Δt}}=\frac{v}{\mathrm{\λ}}\cos \mathrm{\θ},$ Wherein for maximum doppler frequency.

Suppose uniform motion, speed is constant, and signal frequency is constant, then Doppler frequency shift is constant.

As shown in Figure 6, channel simulation equipment determines the schematic diagram of signal after the process needing to export, that is: determine its fading factor respectively to each footpath signal, be multiplied by the average power b in each footpath by this fading factor respectively _iform the decay factor in each footpath, send the delayer of signal by each footpath, each footpath signal is postponed, then each footpath postpone after corresponding with each footpath respectively attenuation factor of signal, the stack result of the signal after the decay of each footpath postpones is exactly signal after the process that exports of last needs.

By amendment multipath number, the time delay in each footpath and the decay factor in each footpath, the object of analog frequency Selective intensity can be reached.

When determining that signal does not need through channel circumstance process, so in step S302, channel simulation equipment, according to signal and the channel circumstance of simulating, is determined signal after the required process exported, is specifically comprised:

After channel simulation equipment determines the process needing to export, signal is the signal that RRU or network side signal handling equipment send.

The up-downgoing demodulation method of testing provided by the embodiment of the present invention, when testing, downstream signal is sent to channel simulation equipment from network side signal handling equipment, exported signal after the process determined according to channel circumstance by channel simulation equipment, after this process, signal is directly sent to UE by RRU by the cable between RRU and UE again; After downstream signal is sent to RRU by UE by cable, this downstream signal is sent to channel simulation equipment by RRU, by channel simulation equipment, signal after process is sent to follow-up network side signal handling equipment.

The embodiment of the present invention also provides a kind of up-downgoing demodulation testing apparatus, as shown in Figure 7, comprising:

Receiving element 701, for receiving the signal of RRU or the transmission of network side signal handling equipment;

Processing unit 702, for according to signal and the channel circumstance of simulating, determines signal after the required process exported;

Output unit 703, for signal after network side signal handling equipment or RRU output processing.

Wherein, processing unit 702 also for:

According to signal and the channel circumstance of simulating, to determine after the required process exported, before signal, to determine that signal demand is through channel circumstance process.

Processing unit 702 specifically for:

According to the multipath number preset, the multipath fading factor, each footpath postpone and each footpath average power, determine need export process after signal.

Processing unit 702 specifically for:

After determining the process needing to export, signal is:

$y\left(t\right)=\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{a}_i\·\exp (j\·2\mathrm{\π}(f_c+f_d)\·t)\·s(t-{\mathrm{\τ}}_i)=s\left(t\right)*h(t,\mathrm{\τ})$

Wherein, $h(t,\mathrm{\τ})=\mathrm{\δ}(t-{\mathrm{\τ}}_i\left(t\right))\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{a}_i\exp \left(j2\mathrm{\π}(f_c+f_d)t\right),$ N is multipath number, a _ibe the decay factor of i-th multipath, f _cfor carrier frequency, f _dfor Doppler frequency shift, τ _ibe the time delay of i-th multipath, s (t) represents convolution for the envelope that transmits, *, and h (t, τ) is channel impulse response.

Processing unit 702 determines that signal does not need through channel circumstance process, and processing unit 702, according to signal and the channel circumstance of simulating, is determined signal after the required process exported, specifically comprised:

After determining the process needing to export, signal is the signal that RRU or network side signal handling equipment send.

The embodiment of the present invention also provides a kind of up-downgoing demodulation test macro, as shown in Figure 8, also comprises:

UE801 and the RRU802 be connected by cable with UE801, the channel simulation equipment 803 be connected with RRU802, and the network side signal handling equipment 804 of connecting channel analog machine 803, wherein:

Channel simulation equipment 803 for, receive the signal that RRU802 or network side signal handling equipment 804 send; According to this signal and the channel circumstance of simulating, determine signal after the required process exported; And signal after exporting this process to network side signal handling equipment 804 or RRU802.

The embodiment of the present invention provides a kind of up-downgoing demodulation method of testing, Apparatus and system, channel simulation equipment is after the signal receiving RRU or the transmission of network side signal handling equipment, signal after the process of this signal is determined according to the channel circumstance of simulation, again signal after this process is sent to the equipment of opposite side, i.e. signal handling equipment or RRU.Owing to not re-using the channel simulator be arranged between RRU and UE, but between RRU and network side signal handling equipment, the mode being arranged through software process determines to process the channel simulation equipment of rear signal, realize the simulation to channel circumstance, improve under the channel simulation condition of indoor, the efficiency of up-downgoing demodulation test.

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 the form of complete hardware embodiment, completely software implementation or the embodiment in conjunction with software and hardware aspect.And the present invention can adopt in one or more form wherein including the upper computer program implemented of computer-usable storage medium (including but not limited to magnetic disc store, CD-ROM, optical memory etc.) of computer usable program code.

The present invention describes with reference to according to the flow chart of the method for the embodiment of the present invention, equipment (system) and computer program and/or block diagram.Should understand can by the combination of the flow process in each flow process in computer program instructions realization flow figure and/or block diagram and/or square frame and flow chart and/or block diagram and/or square frame.These computer program instructions can being provided to the processor of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing device to produce a machine, making the instruction performed by the processor of computer or other programmable data processing device produce device for realizing the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.

These computer program instructions also can be stored in can in the computer-readable memory that works in a specific way of vectoring computer or other programmable data processing device, the instruction making to be stored in this computer-readable memory produces the manufacture comprising command device, and this command device realizes the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.

These computer program instructions also can be loaded in computer or other programmable data processing device, make on computer or other programmable devices, to perform sequence of operations step to produce computer implemented process, thus the instruction performed on computer or other programmable devices is provided for the step realizing the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.

Although describe the preferred embodiments of the present invention, those skilled in the art once obtain the basic creative concept of cicada, then can make other change and amendment to these embodiments.So claims are intended to be interpreted as comprising preferred embodiment and falling into all changes and the amendment of the scope of the invention.

Obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.

Claims (11)

1. a up-downgoing demodulation method of testing, is characterized in that, comprising:

Channel simulation equipment receives the signal of far-end radio-frequency apparatus RRU or the transmission of network side signal handling equipment;

Channel simulation equipment, according to described signal and the channel circumstance of simulating, determines signal after the required process exported;

If channel simulation equipment receives the signal that RRU sends, then signal after exporting described process to network side signal handling equipment, if the signal receiving the transmission of network side signal handling equipment, then signal after exporting described process to RRU.

2. the method for claim 1, is characterized in that, described channel simulation equipment, according to described signal and the channel circumstance of simulating, to be determined after the required process exported, before signal, also to comprise:

Determine that described signal demand is through channel circumstance process.

3. method as claimed in claim 2, is characterized in that, described channel simulation equipment, according to described signal and the channel circumstance of simulating, is determined signal after the required process exported, specifically comprised:

Channel simulation equipment according to the multipath number preset, the multipath fading factor, each footpath postpone and each footpath average power, determine need export process after signal.

4. method as claimed in claim 3, is characterized in that, described channel simulation equipment postpones and each footpath average power according to the multipath number preset, the multipath fading factor, each footpath, determines to need signal after the process of output, specifically comprises:

After channel simulation equipment determines the process needing to export, signal is:

$y\left(t\right)=\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{a}_i\·\exp (j\·2\mathrm{\π}(f_c+f_d)\·t)\·s(t-{\mathrm{\τ}}_i)=s\left(t\right)*h(t,\mathrm{\τ})$

Wherein, $h(t,\mathrm{\τ})=\mathrm{\δ}(t-{\mathrm{\τ}}_i\left(t\right))\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{a}_i\exp \left(j2\mathrm{\π}(f_c+f_d)t\right),$ δ is unit impulse function, and n is multipath number, a _ibe the decay factor of i-th multipath, f _cfor carrier frequency, f _dfor Doppler frequency shift, τ _ibe the time delay of i-th multipath, s (t) represents convolution for the envelope that transmits, *, and h (t, τ) is channel impulse response, exp (x) represents e ^x.

5. the method for claim 1, it is characterized in that, when determining that described signal does not need through channel circumstance process, described channel simulation equipment is according to described signal and the channel circumstance of simulating, signal after the process exported required for determining, specifically comprises:

After channel simulation equipment determines the process needing to export, signal is the signal that described RRU or network side signal handling equipment send.

6. a up-downgoing demodulation testing apparatus, is characterized in that, comprising:

Receiving element, for receiving the signal of far-end radio-frequency apparatus RRU or the transmission of network side signal handling equipment;

Processing unit, for according to described signal and the channel circumstance of simulating, determines signal after the required process exported;

Output unit, if the signal receiving RRU transmission for receiving element, then signal after exporting described process to network side signal handling equipment, if receiving element receives the signal that network side signal handling equipment sends, then signal after exporting described process to RRU.

7. device as claimed in claim 6, is characterized in that, described processing unit also for:

According to described signal and the channel circumstance of simulating, to determine after the required process exported, before signal, to determine that described signal demand is through channel circumstance process.

8. device as claimed in claim 7, is characterized in that, described processing unit specifically for:

According to the multipath number preset, the multipath fading factor, each footpath postpone and each footpath average power, determine need export process after signal.

9. device as claimed in claim 8, is characterized in that, described processing unit specifically for:

After determining the process needing to export, signal is:

$y\left(t\right)=\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{a}_i\·\exp (j\·2\mathrm{\π}(f_c+f_d)\·t)\·s(t-{\mathrm{\τ}}_i)=s\left(t\right)*h(t,\mathrm{\τ})$

Wherein, $h(t,\mathrm{\τ})=\mathrm{\δ}(t-{\mathrm{\τ}}_i\left(t\right))\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{a}_i\exp \left(j2\mathrm{\π}(f_c+f_d)t\right),$ δ is unit impulse function, and n is multipath number, a _ibe the decay factor of i-th multipath, f _cfor carrier frequency, f _dfor Doppler frequency shift, τ _ibe the time delay of i-th multipath, s (t) represents convolution for the envelope that transmits, *, and h (t, τ) is channel impulse response.

10. device as claimed in claim 6, it is characterized in that, described processing unit determines that described signal does not need through channel circumstance process, and described processing unit is according to described signal and the channel circumstance of simulating, signal after the process exported required for determining, specifically comprises:

After determining the process needing to export, signal is the signal that described RRU or network side signal handling equipment send.

11. 1 kinds of up-downgoing demodulation test macros, is characterized in that, comprising:

User equipment (UE) and the RRU be connected by cable with UE, the channel simulation equipment be connected with described RRU, and the network side signal handling equipment connecting described channel simulation equipment, wherein:

Described channel simulation equipment is used for, and receives the signal of RRU or the transmission of network side signal handling equipment; According to described signal and the channel circumstance of simulating, determine signal after the required process exported; If receive the signal of RRU transmission, then signal after exporting described process to network side signal handling equipment, if receive the signal of network side signal handling equipment transmission, then signal after exporting described process to RRU.