CN102917398A - Method, device and system for testing unlink and downlink demodulation - Google Patents

Abstract

The invention discloses a method, a device and a system for testing uplink and downlink demodulation, and relates to the communication technology. The method includes determining a processed signal of a signal according to a simulated channel environment after channel simulation equipment receives the signal transmitted by an RRU (remote radio unit) or signal processing equipment on a network side; and transmitting the processed signal to equipment on another side, namely the signal processing equipment or the RRU. A channel simulator between the RRU and UE (user equipment) is omitted, while the channel simulation equipment which determines the processed signal in a software processing mode is arranged between the RRU and the signal processing equipment on the network side, so that the channel environment is simulated, and the uplink and downlink demodulation testing efficiency under the condition of indoor channel simulation is improved.

Description

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

Technical field

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

Background technology

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

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

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

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

Summary of the invention

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

A kind of up-downgoing demodulation method of testing comprises:

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 is according to described signal and the channel circumstance of simulating, and determines signal after the processing of required output;

Channel simulation equipment is exported signal after the described processing to network side signal handling equipment or RRU.

A kind of up-downgoing demodulation testing apparatus comprises:

Receiving element is used for the signal that reception far-end radio-frequency apparatus RRU or network side signal handling equipment send;

Processing unit is used for according to described signal and the channel circumstance of simulating, and determines signal after the processing of required output;

Output unit is used for exporting signal after the described processing to network side signal handling equipment or RRU.

A kind of up-downgoing demodulation test macro comprises:

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

Described channel simulation equipment is used for, and receives the signal that RRU or network side signal handling equipment send; According to described signal and the channel circumstance of simulating, determine signal after the processing of required output; And export signal after the described processing to network side signal handling equipment or RRU.

The embodiment of the invention provides a kind of up-downgoing demodulation method of testing, Apparatus and system, channel simulation equipment is behind the signal that receives the transmission of RRU or network side signal handling equipment, determine signal after the processing of this signal according to the channel circumstance of simulation, signal sends to the equipment of opposite side, i.e. signal handling equipment or RRU after will processing again.Owing to not re-using the channel simulator that is arranged between RRU and the UE, but between RRU and network side signal handling equipment, the channel simulation equipment of signal after the mode that setting is processed by software is determined to process, realize the simulation to channel circumstance, improved under indoor channel simulation condition the efficient of up-downgoing demodulation test.

Description of drawings

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

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

Fig. 2 b be in the 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 invention;

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

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

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

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

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

Embodiment

The embodiment of the invention provides a kind of up-downgoing demodulation method of testing, Apparatus and system, channel simulation equipment is behind the signal that receives the transmission of RRU or network side signal handling equipment, determine signal after the processing of this signal according to the channel circumstance of simulation, signal sends to the equipment of opposite side, i.e. signal handling equipment or RRU after will processing again.Owing to not re-using the channel simulator that is arranged between RRU and the UE, but between RRU and network side signal handling equipment, the channel simulation equipment of signal after the mode that setting is processed by software is determined to process, realize the simulation to channel circumstance, improved under indoor channel simulation condition the efficient of up-downgoing demodulation test.

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

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

Step S302, channel simulation equipment be according to signal and the channel circumstance of simulating, and determines signal after the processing of required output;

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

Because channel simulation equipment, is determined signal after the processing of required output according to signal and the channel circumstance of simulating, send signal after this processings to the equipment of opposite side again, thereby realization is to the simulation of environment.

Concrete, channel simulation equipment is determined this step of signal after the processing of required output, can realize by software, according to received signal and the channel circumstance of simulating, can calculate signal after the processing of required output, the signal after processing to network side signal handling equipment or RRU output again.

As shown in Figure 4, channel simulation equipment is arranged between RRU and the network side signal handling equipment, UE is connected with RRU and is connected by cable, thereby reduce the loss between UE and the RRU, in Fig. 4, channel simulation equipment is arranged on RRU and PL(Physical Layer, physical layer) between, according to setting in advance, channel simulation equipment can be according to the signal that receives and the channel circumstance of simulating, and determines signal after the processing of required output, thereby realize the simulation to channel, channel simulation equipment also can be when needed, directly so that the signal that signal equals to receive after the processing of required output does not carry out the simulation to channel.

Concrete,, determine after the processing of required output also to comprise before the signal according to signal and the channel circumstance of simulating at step S302 channel simulation equipment: determine that signal demand processes through channel circumstance.

When channel simulation equipment was determined to simulate channel, step S302 specifically comprised:

Channel simulation equipment is according to predefined multipath number, the multipath fading factor, each footpath delay and each footpath average power, signal after the processing of determining to need to export.

Concrete, channel simulation equipment is according to predefined multipath number, the multipath fading factor, each footpath delay and each footpath average power, and signal after the processing of determining to need to export specifically comprises:

Signal is after the processing that channel simulation equipment is determined to need to export:

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

Wherein, $h(t,\mathrm{\&tau;})=\mathrm{\&delta;}(t-{\mathrm{\&tau;}}_i\left(t\right))\underset{i=1}{\overset{n}{\mathrm{\&Sigma;}}}{a}_i\exp \left(\mathrm{<figure-callout\; id="2"\; label="j"\; filenames="HDA00002325228100021.png,HDA00002325228100031.png"\; state="\{\{state\}\}">j</figure-callout>}2\mathrm{\&pi;}(f_c+f_d)t\right),$ N is the multipath number, a _iBe the decay factor of i bar multipath, f _cBe carrier frequency, f _dBe Doppler frequency shift, τ _iBe the time delay of i bar multipath, s (t) is the envelope that transmits, and * represents convolution, and h (t, τ) is channel impulse response,

Exp(x) expression e ^x

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

$f_d=\frac{1}{2\mathrm{\&pi;}}\frac{\mathrm{\&Delta;\&phi;}}{\mathrm{\&Delta;t}}=\frac{v}{\mathrm{\&lambda;}}\cos \mathrm{\&theta;},$ Wherein Be maximum doppler frequency.

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

As shown in Figure 6, the schematic diagram of signal after the processing that channel simulation equipment is determined to need to export that is: is determined respectively its fading factor to each footpath signal, multiply by respectively the average power b in each footpath by this fading factor _iForm the decay factor in each footpath, transmitted signal postpones each footpath signal by the delayer in each footpath, then the signal after each footpath postpones multiplies each other with decay factor corresponding to each footpath respectively, and the stack result of the signal after each footpath decay postpones is exactly signal after the processing of last needs output.

Can by revising multipath quantity, each time delay directly and the decay factor in each footpath, reach the purpose of analog frequency selectivity decline.

When definite signal did not need to process through channel circumstance, so among the step S302, channel simulation equipment was according to signal and the channel circumstance of simulating, and determined signal after the processing of required output, specifically comprised:

Signal is the signal that RRU or network side signal handling equipment send after the processing that channel simulation equipment is determined to need to export.

The up-downgoing demodulation method of testing that provides by the embodiment of the invention, when test, downstream signal is sent to channel simulation equipment from the network side signal handling equipment, exported according to signal after the definite processing of channel circumstance by channel simulation equipment, signal directly is sent to UE by RRU by the cable between RRU and UE again after this processing; After downstream signal was sent to RRU by UE by cable, RRU was sent to channel simulation equipment with this downstream signal, and signal is sent to follow-up network side signal handling equipment after will being processed by channel simulation equipment.

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

Receiving element 701 is used for the signal that reception RRU or network side signal handling equipment send;

Processing unit 702 is used for according to signal and the channel circumstance of simulating, and determines signal after the processing of required output;

Output unit 703 is used for processing rear signal to network side signal handling equipment or RRU output.

Wherein, processing unit 702 also is used for:

According to signal and the channel circumstance of simulating, determine after the processing of required output before the signal, determine that signal demand processes through channel circumstance.

Processing unit 702 specifically is used for:

According to predefined multipath number, the multipath fading factor, each footpath delay and each footpath average power, signal after the processing of determining to need to export.

Processing unit 702 specifically is used for:

Signal is after the processing of determining to need to export:

$y\left(t\right)=\underset{i=1}{\overset{n}{\mathrm{\&Sigma;}}}{a}_i\&CenterDot;\exp (j\&CenterDot;2\mathrm{\&pi;}(f_c+f_d)\&CenterDot;t)\&CenterDot;s(t-{\mathrm{\&tau;}}_i)=s\left(t\right)*h(t,\mathrm{\&tau;})$

Wherein, $h(t,\mathrm{\&tau;})=\mathrm{\&delta;}(t-{\mathrm{\&tau;}}_i\left(t\right))\underset{i=1}{\overset{n}{\mathrm{\&Sigma;}}}{a}_i\exp \left(\mathrm{<figure-callout\; id="2"\; label="j"\; filenames="HDA00002325228100021.png,HDA00002325228100031.png"\; state="\{\{state\}\}">j</figure-callout>}2\mathrm{\&pi;}(f_c+f_d)t\right),$ N is the multipath number, a _iBe the decay factor of i bar multipath, f _cBe carrier frequency, f _dBe Doppler frequency shift, τ _iBe the time delay of i bar multipath, s (t) is the envelope that transmits, and * represents convolution, and h (t, τ) is channel impulse response.

When processing unit 702 determined that signals do not need to process through channel circumstance, processing unit 702 was according to signal and the channel circumstance of simulating, and determined signal after the processing of required output, specifically comprised:

Signal is the signal that RRU or network side signal handling equipment send after the processing of determining to need to export.

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

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

Channel simulation equipment 803 is used for, and receives 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 processing of required output; And export signal after this processing to network side signal handling equipment 804 or RRU802.

The embodiment of the invention provides a kind of up-downgoing demodulation method of testing, Apparatus and system, channel simulation equipment is behind the signal that receives the transmission of RRU or network side signal handling equipment, determine signal after the processing of this signal according to the channel circumstance of simulation, signal sends to the equipment of opposite side, i.e. signal handling equipment or RRU after will processing again.Owing to not re-using the channel simulator that is arranged between RRU and the UE, but between RRU and network side signal handling equipment, the channel simulation equipment of signal after the mode that setting is processed by software is determined to process, realize the simulation to channel circumstance, improved under indoor channel simulation condition the efficient 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 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 (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 is according to described signal and the channel circumstance of simulating, and determines signal after the processing of required output;

Channel simulation equipment is exported signal after the described processing to network side signal handling equipment or RRU.

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

Determine that described signal demand is through the channel circumstance processing.

3. method as claimed in claim 2 is characterized in that, described channel simulation equipment is according to described signal and the channel circumstance of simulating, and determines signal after the processing of required output, specifically comprises:

Channel simulation equipment is according to predefined multipath number, the multipath fading factor, each footpath delay and each footpath average power, signal after the processing of determining to need to export.

4. method as claimed in claim 3 is characterized in that, described channel simulation equipment is according to predefined multipath number, the multipath fading factor, each footpath delay and each footpath average power, and signal after the processing of determining to need to export specifically comprises:

Signal is after the processing that channel simulation equipment is determined to need to export:

$y\left(t\right)=\underset{i=1}{\overset{n}{\mathrm{\&Sigma;}}}{a}_i\&CenterDot;\exp (j\&CenterDot;2\mathrm{\&pi;}(f_c+f_d)\&CenterDot;t)\&CenterDot;s(t-{\mathrm{\&tau;}}_i)=s\left(t\right)*h(t,\mathrm{\&tau;})$

Wherein, $h(t,\mathrm{\&tau;})=\mathrm{\&delta;}(t-{\mathrm{\&tau;}}_i\left(t\right))\underset{i=1}{\overset{n}{\mathrm{\&Sigma;}}}{a}_i\exp \left(j2\mathrm{\&pi;}(f_c+f_d)t\right),$ N is the multipath number, a _iBe the decay factor of i bar multipath, f _cBe carrier frequency, f _dBe Doppler frequency shift, τ _iBe the time delay of i bar multipath, s (t) is the envelope that transmits, and * represents convolution, and h (t, τ) is channel impulse response,

Exp(x) expression e ^x

5. the method for claim 1, it is characterized in that, when definite described signal did not need to process through channel circumstance, described channel simulation equipment was according to described signal and the channel circumstance of simulating, determine signal after the processing of required output, specifically comprise:

Signal is the signal that described RRU or network side signal handling equipment send after the processing that channel simulation equipment is determined to need to export.

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

Receiving element is used for the signal that reception far-end radio-frequency apparatus RRU or network side signal handling equipment send;

Processing unit is used for according to described signal and the channel circumstance of simulating, and determines signal after the processing of required output;

Output unit is used for exporting signal after the described processing to network side signal handling equipment or RRU.

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

According to described signal and the channel circumstance of simulating, determine after the processing of required output before the signal, determine that described signal demand processes through channel circumstance.

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

According to predefined multipath number, the multipath fading factor, each footpath delay and each footpath average power, signal after the processing of determining to need to export.

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

Signal is after the processing of determining to need to export:

$y\left(t\right)=\underset{i=1}{\overset{n}{\mathrm{\&Sigma;}}}{a}_i\&CenterDot;\exp (j\&CenterDot;2\mathrm{\&pi;}(f_c+f_d)\&CenterDot;t)\&CenterDot;s(t-{\mathrm{\&tau;}}_i)=s\left(t\right)*h(t,\mathrm{\&tau;})$

Wherein, $h(t,\mathrm{\&tau;})=\mathrm{\&delta;}(t-{\mathrm{\&tau;}}_i\left(t\right))\underset{i=1}{\overset{n}{\mathrm{\&Sigma;}}}{a}_i\exp \left(j2\mathrm{\&pi;}(f_c+f_d)t\right),$ N is the multipath number, a _iBe the decay factor of i bar multipath, f _cBe carrier frequency, f _dBe Doppler frequency shift, τ _iBe the time delay of i bar multipath, s (t) is the envelope that transmits, and * represents convolution, and h (t, τ) is channel impulse response.

10. device as claimed in claim 6, it is characterized in that, when described processing unit determined that described signal does not need to process through channel circumstance, described processing unit was according to described signal and the channel circumstance of simulating, determine signal after the processing of required output, specifically comprise:

Signal is the signal that described RRU or network side signal handling equipment send after the processing of determining to need to export.

11. a up-downgoing demodulation test macro is characterized in that, comprising:

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

Described channel simulation equipment is used for, and receives the signal that RRU or network side signal handling equipment send; According to described signal and the channel circumstance of simulating, determine signal after the processing of required output; And export signal after the described processing to network side signal handling equipment or RRU.

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