CN103179603A - Simulation testing system and method for urban wireless network channel - Google Patents

Abstract

The invention discloses a simulation testing system and method for an urban wireless network channel. The system comprises n base band data replication selecting modules and n channelized processing modules. Every base band data replication selecting module is used for enabling upstream base band data input from a plurality of optical port links to be replicated into n paths and be respectively input into the n channelized processing modules and is used for downstream receiving data which undergo channelized processing and are output by the n channelized processing modules and selecting multipath signals with the same number as the optical port links from the data so as to output the signals. Every channelized processing module is used for performing the following treatments on the n path base band data input upstream: selecting part of base band data to perform large-scale fading operation and small-scale fading operation, performing multipath time delay caching on the base band data undergoing the fading operation, overlaying all base band data output to the same base band data replication selecting module, and then outputting the data downstream to the base band data replication selecting modules. According to the simulation testing system and method for the urban wireless network channel, large-scale wireless network channel simulation testing is achieved, and testing cost is low.

Description

A kind of city wireless network channel emulation test system and method

Technical field

The present invention relates to wireless communication field, be specifically related to city wireless network wireless channel simulator test macro and method.

Background technology

Wireless channel is a kind of time varying channel, and when wireless signal passed through this channel, the decline that shows had: the 1st, change loss and the disperse that produces with the signal transmission range; The 2nd, due to the landform in transmission environment, building and other barriers to caused shadow fading of stopping of electromagnetic signal; The 3rd, wireless signal is subject to reflection, diffraction and the scattering of peripheral obstacle on transmission path, make it arrive the stack that receiver is a plurality of signals of transmitting from a plurality of paths, the multipath fading that causes signal to cause in the change at random of amplitude, phase place and the time of advent of receiving terminal; The 4th, receiving terminal side signal transmission to movement and the Doppler frequency shift that produces makes to receive signal in the expansion of frequency domain, produce additional FM noise, distorted signals appears receiving.

When the research wireless channel, usually wireless channel is divided into large scale decline and two kinds of modes of multipath fading.Large scale decline model is used for describing the upper change in signal strength of long distance between transmitter and receiver, comprises loss, disperse and shadow fading; The multipath fading model is used for describing the quick variation of the signal strength signal intensity in short distance and short time, comprises multipath fading and Doppler frequency shift.

Wireless Telecom Equipment manufacturer need to carry out extensive testing under true environment when producing Wireless Telecom Equipment, guarantee equipment reliable and stable.But the test of true environment need to be built a large amount of base station equipments and large-scale sport car drive test, and testing cost is high and efficient is low.And wireless channel environment is ever-changing, an anomaly occurs and often is difficult to reproduction, even repeat for a long time drive test, also is difficult to find extreme wireless scene to carry out pressure test to equipment.

Summary of the invention

The technical problem to be solved in the present invention is to provide a kind of city wireless network channel emulation test system and method, realize large-scale radio network information channel emulation testing, and testing cost is low.

For solving the problems of the technologies described above, the invention provides a kind of city wireless network channel emulation test system, comprising: n base band data Replica Selection module and n channelizing processing module, wherein:

Each base band data Replica Selection module is used at up direction, will be copied into the n road from the base band data of a plurality of optical interface link inputs, inputs respectively n channelizing processing module; At down direction, the data after the channelizing that receives the output of n channelizing processing module is processed therefrom select the multiple signals identical with optical interface link quantity to export;

Each channelizing processing module, being used for that the n roadbed band data of up input are carried out channelizing processes, comprise: select the part base band data to carry out large scale decline computing and multipath fading computing from the base band data of input, base band data after the decline computing is carried out the multipath delay buffer memory, to the descending base band data Replica Selection module that exports to after all base band data stacks that output to same base band data Replica Selection module.

Further, described system also comprises n base band data access module, base band data Replica Selection module of the corresponding connection of each base band data access module, each base band data access module is used for receiving by optical interface link at up direction the base band data of equipment to be tested, described base band data is carried out inputting the base band data Replica Selection module corresponding with this base band data access module after rate transition, and the base band data that is used for receiving at down direction the output of base band data Replica Selection module, carry out exporting after rate transition.

Further, described channelizing processing module is realized by logical operation circuit, described logical operation circuit comprises input aerial data selector, an x large scale decline multiplier, a y multipath fading multiplier, a y multidiameter delay buffer area, and output antenna data selector, y=kx, k ∈ [3,18], wherein:

Described input aerial data selector is used for selecting to carry out the base band data that channelizing is processed, and inputs respectively x large scale decline multiplier;

Described large scale decline multiplier, be used for the base band data of input is carried out large scale decline computing, comprise: the base band data that will input multiply by large scale fading factor corresponding to this base band data, and the base band data after large scale decline computing is copied rear y the multipath fading multiplier of inputting respectively;

Described multipath fading multiplier is used for the base band data of input is carried out the multipath fading computing, and comprising: the base band data that will input multiply by the multipath fading factor corresponding to this base band data, the multidiameter delay buffering area that input is corresponding;

Described multidiameter delay buffer area, be used for after will the multipath fading computing of input base band data by given delay parameter delay time buffer memory and merge after the described output antenna data selector of input;

Described output antenna data selector is used for receiving base band data from y multidiameter delay buffering area, the base band data that outputs to same base band data Replica Selection module superposeed, and the data after superposeing to the base band data Replica Selection module output of correspondence.

Further, described system also comprises n fading parameter administration module, it is used to the large scale decline multiplier in corresponding channelizing processing module that the large scale fading factor is provided, for the multipath fading multiplier in the channelizing processing module of correspondence provides the multipath fading factor, and provide delay parameter for the multidiameter delay buffer area in the channelizing processing module of correspondence.

Further, described fading parameter administration module is realized by digital signal processor.

Further, described n 〉=2.

Further, described n=9.

For solving the problems of the technologies described above, the invention provides a kind of city wireless network channel emulation test method, comprising:

Be input to the base band data of same base band data Replica Selection module from a plurality of optical interface links, be copied into the n road by this base band data Replica Selection module, input respectively n channelizing processing module;

Each channelizing processing module selects the part base band data to carry out large scale decline computing and multipath fading computing from the n roadbed band data of input, base band data after the decline computing is carried out the multipath delay buffer memory, to the descending base band data Replica Selection module that exports correspondence to after all base band data stacks that output to same base band data Replica Selection module;

Data after the channelizing of n channelizing processing module output of each base band data Replica Selection module reception is processed are therefrom selected the multiple signals output identical with optical interface link quantity.

Further, before base band data Replica Selection module copied base band data, described method also comprised:

First after carrying out rate transition, the base band data access module inputs again base band data Replica Selection module from the base band data of a plurality of optical interface link inputs;

Described base band data Replica Selection module selects the multiple signals identical with optical interface link quantity to export the base band data access module to, and this base band data access module carries out exporting after rate transition to the base band data that receives.

Further, described channelizing processing module is used for carrying out in the following ways large scale decline computing: the base band data that will input multiply by large scale fading factor corresponding to this base band data;

Described channelizing processing module is used for carrying out in the following ways the multipath fading computing: the base band data that will input multiply by the multipath fading factor corresponding to this base band data;

Described channelizing processing module is used for carrying out in the following ways the multipath delay buffer memory: to the base band data of this input by given delay parameter delay time buffer memory and merging.

By the present invention, can carry out emulation broadcast, playback to various wireless channel scenes at the wireless network environment in the whole city of experiment lab simulation, for wireless device provides sufficient test environment, greatly reduce the field testing cost of equipment vendor.Compared to the prior art, emulation test method provided herein and system emulation popularization are a lot, existing channel simulator is generally the single UE in single residential quarter, or the channel circumstance of several several UE in residential quarter, and the simulation scale of this paper method of testing and system is brought up to the networking scale of the maximum 576 residential quarters * 576UE of support, can simulate the wireless channel network environment in whole city, can carry out the test of simcity external field environment to base station and terminal equipment in the laboratory, at the indoor environment that pilot office is provided.Simultaneously owing to being employing DSP (Digital Signal Processor, digital signal processor) and FPGA (Field Programmable Gate Array, field programmable gate array) framework directly carries out the channelizing processing and disturbs synthetic base band data, realize that cost is low on the one hand, can be suitable on the other hand different wireless network standards, very strong versatility is arranged.

Description of drawings

Fig. 1 is the embodiment of the present invention 1 emulate system architecture schematic diagram;

Fig. 2 is the maximum emulate system architecture schematic diagram of supporting 72 equipment to be tested of the embodiment of the present invention 1;

Fig. 3 is the embodiment of the present invention 1 channelizing processing module FPGA internal structure schematic diagram;

Fig. 4 is the emulate system architecture schematic diagram that comprises the fading parameter administration module;

Fig. 5 is the emulate system architecture schematic diagram that the embodiment of the present invention 2 comprises the base band data access module;

Fig. 6 is the CPRI light mouth aggregation infrastructure schematic diagram of base band data access module 10M2 antenna;

Fig. 7 is the CPRI light mouth aggregation infrastructure schematic diagram of base band data access module 10M4 antenna or 20M2 antenna;

Fig. 8 is the CPRI light mouth aggregation infrastructure schematic diagram of base band data access module 10M8 antenna or 20M4 antenna;

Fig. 9 is the embodiment of the present invention 2 channelizing processing module FPGA internal structure schematic diagrames.

Embodiment

For making the purpose, technical solutions and advantages of the present invention clearer, hereinafter in connection with accompanying drawing, embodiments of the invention are elaborated.Need to prove, in the situation that do not conflict, the embodiment in the application and the feature in embodiment be combination in any mutually.

Embodiment 1

As shown in Figure 1, comprise with lower module: n base band data Replica Selection module and n channelizing processing module, wherein:

Each base band data Replica Selection module is used at up direction, will be copied into the n road from the base band data of a plurality of optical interface link inputs, inputs respectively n channelizing processing module; At down direction, the data after the channelizing that receives the output of n channelizing processing module is processed therefrom select the multiple signals identical with optical interface link quantity to export;

Each channelizing processing module, being used for that the n roadbed band data of up input are carried out channelizing processes, comprise: select the part base band data to carry out large scale decline computing and multipath fading computing from the base band data of input, base band data after the decline computing is carried out the multipath delay buffer memory, to the descending base band data Replica Selection module that exports to after all base band data stacks that output to same base band data Replica Selection module.

Owing to needing to carry out a large amount of multiplication process in wireless channel simulation, therefore need to adopt a plurality of base band data Replica Selection modules and channelizing processing module to realize, specifically this base band data Replica Selection module and channelizing processing module can adopt logical operation circuit to realize.

Fig. 2 realizes that with FPGA the schematic diagram of base band data Replica Selection module and channelizing processing module, schematic structure can simulate base station cell and/or the UE (terminal) of 20M 8 antennas, maximum 72 base station cells and/or the terminal supported.

Said n 〉=2.Preferred n=9.N=9 in Fig. 2,9 base band data Replica Selection modules and 9 channelizing processing modules are namely arranged, each module realizes by FPGA, and wherein base band data Replica Selection module is respectively FPGA-a0～FPGA-a8, and the channelizing processing module is respectively FPGA-b0～FPGA-b8.

The operation of explanation base band data Replica Selection module as an example of FPGA-a0 example, this FPGA-a0 receives the base band data of 8 road optical fiber inputs, and this 8 roadbed band data Replica is become 9 parts of input channel processing module FPGA-b0～FPGA-b8 respectively.The same FPGA-a0 of the operation of FPGA-a1～FPGA-a8, each FPGA parallel processing independently of each other.

The operation of explanation channelizing processing module as an example of FPGA-b0 example, this FPGA-b0 reception 8 * 9 is totally 72 roadbed band data, respectively every roadbed band data carried out channelizing and processes.The internal structure of FPGA-b0 as shown in Figure 3, the same FPGA-b0 of the internal structure of FPGA-b1～FPGA-b8, each FPGA parallel processing independently of each other.

As shown in Figure 3, each channelizing processing module comprises input aerial data selector, an x large scale decline multiplier, a y multipath fading multiplier, a y multidiameter delay buffer area and output antenna data selector, y=kx, and k ∈ [3,18], wherein:

This input aerial data selector is used for selecting to carry out the base band data that channelizing is processed, and inputs respectively x large scale decline multiplier; For example can arrange sequence number according to base band data from input link selects the current time needs to carry out the base band data that channelizing is processed;

This large scale decline multiplier, be used for the base band data of input is carried out large scale decline computing, comprise: the base band data that will input multiply by large scale fading factor corresponding to this base band data, and the base band data after large scale decline computing is copied rear y the multipath fading multiplier of inputting respectively;

This multipath fading multiplier is used for the base band data of input is carried out the multipath fading computing, and comprising: the base band data that will input multiply by the multipath fading factor corresponding to this base band data, the multidiameter delay buffering area that input is corresponding;

This multidiameter delay buffer area, be used for after will the multipath fading computing of input base band data by given delay parameter delay time buffer memory and merge after this output antenna data selector of input; Particularly, after merging, the way of base band data equals the way of the selected base band data of input aerial data selector, i.e. the number x of large scale decline multiplier;

This output antenna data selector is used for receiving base band data from y multidiameter delay buffering area, the base band data that outputs to same base band data Replica Selection module superposeed, and the data after superposeing to the base band data Replica Selection module output of correspondence.Particularly, after cumulative, the quantity of data equals the quantity of the data that the input aerial data selector receives.

Emulation platform for scale shown in Figure 2 in the present embodiment, FPGA-b0 receives 72 tunnel inner base band datas, arrange sequence number according to base band data and select present clock moment needs to carry out the base band data that channelizing is processed, the input aerial data selector selects maximum 256 base band datas to carry out Channel Processing from 72 links.Channel treatment processes is large scale decline, multipath fading, multidiameter delay by pipeline organization successively, refers to during multidiameter delay carry out buffer memory by time point, and time point is determined by delay parameter.Exporting at last antenna selector, that all base band datas that output to same base band data Replica Selection module are carried out addition is synthetic, and the base band data that obtains after final channelizing sends to corresponding output antennal interface.

Preferably, the channel fading parameters such as large scale fading factor, the multipath fading factor and delay parameter that logical operation circuit in this each channelizing processing module carries out using when channelizing is processed can be pre-stored in this logical operation circuit, also can be provided by external module.For example by the fading parameter administration module of the outside channel scene according to current emulation, the real-time update channel fading parameters, as shown in Figure 4.This fading parameter administration module can adopt DSP to realize.Corresponding above-mentioned example can adopt 9 DSP to realize, the FPGA in the corresponding Channel Processing module of each DSP, by the CPRI interface to FPGA real-time update fading factor (comprising large scale fading factor and the multipath fading factor) and multidiameter delay parameter.Wherein, the large scale fading factor is supported obtained or produced acquisition by standard channel model by outfield drive test collection, the multipath fading factor and delay parameter can be according to standard channel model, employing is based on the Channel Modeling mode of statistics, and namely the spatial coherence mimo channel is united generation by the spatial correlation matrix that independent fading MIMO channel and statistics obtain.

The antenna number of supposing base station side is M, and the antenna number of end side is N, h _mnRepresent m transmitting antenna and n the link that reception antenna forms, each h _mnBe made of L distinguishable path (or L bunch), every cluster is made of P inseparable " sub-footpath ".Therefore, Frequency-Selective MIMO Channel can be modeled as:

$H\left(t\right)=\underset{l=0}{\overset{L-1}{\mathrm{\Σ}}}{h}_l\mathrm{\δ}(t-{\mathrm{\τ}}_l)$

Wherein, L is sub-footpath number, τ _lBe the time delay of sub-footpath l, t is current time, $h_l=\left[\begin{array}{cccc}{a}_{11}^l& a_{12}^l& \·\·\·& a_{1M}^l\\ a_{21}^l& a_{22}^l& \·\·\·& a_{2M}^l\\ .& .& .& .\\ .& .& .& .\\ .& .& .& .\\ a_{N1}^l& a_{N2}^l& \·\·\·& a_{\mathrm{NM}}^i\end{array}\right],$

Represent n reception antenna, m transmitting antenna consists of the channel fading coefficient in l separable path of link, all

The multiple Gaussian Profile that meets zero-mean.

Based on such hypothesis: the correlation properties of antenna for base station and terminal antenna are irrelevant; The correlation properties of terminal antenna and antenna for base station are irrelevant.Antenna for base station m ₁, m ₂Coefficient correlation and terminal antenna n ₁, n ₂Coefficient correlation be expressed as

${\mathrm{\&rho;}}_{\mathrm{BS}}^{m_1{\mathrm{<figure-callout\; id="2"\; label="m"\; filenames="HDA0000122715000000052.png"\; state="\{\{state\}\}">m</figure-callout>}}_2}=\&lang;a_{{\mathrm{nm}}_1}^l,a_{{\mathrm{nm}}_2}^l\&rang;$

${\mathrm{\&rho;}}_{\mathrm{MS}}^{n_1{\mathrm{<figure-callout\; id="2"\; label="n"\; filenames="HDA0000122715000000052.png"\; state="\{\{state\}\}">n</figure-callout>}}_2}=\&lang;a_{n_{1}m}^l,a_{n_{2}m}^l\&rang;$

Wherein,＜〉expression " second moment " computing or covariance computing.The correlation matrix (for each separable footpath) that can get thus base station side and end side is

$R_{\mathrm{BS}}=\left[\begin{array}{cccc}{\mathrm{\&rho;}}_{\mathrm{BS}}^{11}& {\mathrm{\&rho;}}_{\mathrm{BS}}^{12}& \&CenterDot;\&CenterDot;\&CenterDot;& {\mathrm{\&rho;}}_{\mathrm{BS}}^{1M}\\ {\mathrm{\&rho;}}_{\mathrm{BS}}^{21}& {\mathrm{\&rho;}}_{\mathrm{BS}}^{22}& \&CenterDot;\&CenterDot;\&CenterDot;& {\mathrm{\&rho;}}_{\mathrm{BS}}^{2M}\\ .& .& .& .\\ .& .& .& .\\ .& .& .& .\\ {\mathrm{\&rho;}}_{\mathrm{<figure-callout\; id="1"\; label="BS\; M"\; filenames="HDA0000122715000000031.png,HDA0000122715000000052.png"\; state="\{\{state\}\}">BS</figure-callout>}}^M& {\mathrm{\&rho;}}_{\mathrm{<figure-callout\; id="2"\; label="BS\; M"\; filenames="HDA0000122715000000052.png"\; state="\{\{state\}\}">BS</figure-callout>}}^M& \&CenterDot;\&CenterDot;\&CenterDot;& {\mathrm{\&rho;}}_{\mathrm{BS}}^{\mathrm{MM}}\end{array}\right],$ $R_{\mathrm{MS}}=\left[\begin{array}{cccc}{\mathrm{\&rho;}}_{\mathrm{MS}}^{11}& {\mathrm{\&rho;}}_{\mathrm{MS}}^{12}& \&CenterDot;\&CenterDot;\&CenterDot;& {\mathrm{\&rho;}}_{\mathrm{MS}}^{1N}\\ {\mathrm{\&rho;}}_{\mathrm{MS}}^{21}& {\mathrm{\&rho;}}_{\mathrm{MS}}^{22}& \&CenterDot;\&CenterDot;\&CenterDot;& {\mathrm{\&rho;}}_{\mathrm{MS}}^{2N}\\ .& .& .& .\\ .& .& .& .\\ .& .& .& .\\ {\mathrm{\&rho;}}_{\mathrm{<figure-callout\; id="1"\; label="MS\; N"\; filenames="HDA0000122715000000031.png,HDA0000122715000000052.png"\; state="\{\{state\}\}">MS</figure-callout>}}^N& {\mathrm{\&rho;}}_{\mathrm{<figure-callout\; id="2"\; label="MS\; N"\; filenames="HDA0000122715000000052.png"\; state="\{\{state\}\}">MS</figure-callout>}}^N& \&CenterDot;\&CenterDot;\&CenterDot;& {\mathrm{\&rho;}}_{\mathrm{MS}}^{\mathrm{NN}}\end{array}\right]$

The decline correlation matrix in the l of base station side and end side separable path is respectively:

Be AOA,

Angle spread;

Be AOD, Angle spread.

Correlation matrix R has been arranged _MSAnd R _BS, just can calculate the mimo channel with certain correlated characteristic.

Optical interface link mentioned above refers to CPRI (Common Public Radio Interface, common public radio interface) optical interface link.

Embodiment 2

In order to support more residential quarters and terminal, the present embodiment increases n base band data access module on embodiment 1 Fig. 1 and Fig. 2 basis, as shown in Figure 5.

Base band data Replica Selection module of the corresponding connection of each base band data access module, each base band data access module is used for connecting equipment to be tested (for example base station and/or terminal) at up direction by optical interface link, receive the base band data of equipment to be tested, the base band data of the up input of equipment to be tested is carried out inputting the base band data Replica Selection module corresponding with this base band data access module after rate transition, and the base band data that is used for descending reception base band data Replica Selection module output, carry out exporting after rate transition.

This base band data access module adopts the access of standard CPR I optical fiber, and light mouth speed is supported 2.4576G, 3.072G, 4.9152G or 6.144G, supports all MIMO (Multiple-Input Multiple-Output, multiple-input and multiple-output) antenna configuration.Maximum connects the light inlet number and reaches 576, and after therefore adopting this access module, the networking scale of the present embodiment analogue system can reach 576 residential quarters * 576UE, is equivalent to the scale of the wireless channel network environment of a medium-sized city.

For guaranteeing the full switching fabric of emulation platform 576 residential quarters * 576UE, this base band data Replica Selection module can adopt FPGA (preferred 9) to realize, each FPGA becomes many parts with the optical interface link data Replica of input, each channelizing processing module FPGA is corresponding a, and making each channelizing processing module FPGA is 576 road light mouth base band data inputs.

The below introduces the FPGA operative scenario in several base band data access module, with this, network environment that emulation test system described herein can be simulated is described.

Fig. 6 is that the CPRI light mouth of 10M 2 antennas converges schematic diagram, for each FPGA, base band data is divided into 8 groups, and every group pools 1 inner 10G link by the outside CPRI optical fiber of 8 2.5G, for whole emulation test system, maximum support 8 * 8 * 9 is the base band data access of totally 576 equipment to be tested.

Fig. 7 is that the CPRI light mouth of 10M 4 antennas or 20M 2 antennas converges schematic diagram, for each FPGA, base band data is divided into 8 groups, every group pools 1 inner 10G link by the outside CPRI optical fiber of 4 2.5G, for whole emulation test system, maximum support 8 * 4 * 9 is the base band data access of totally 288 equipment to be tested.

Fig. 8 is that the CPRI light mouth of 10M 8 antennas or 20M 4 antennas converges schematic diagram, for each FPGA, base band data is divided into 8 groups, every group pools 1 inner 10G link by the outside CPRI optical fiber of 2 4.9G, for whole emulation test system, maximum support 8 * 2 * 9 is the base band data access of totally 144 equipment to be tested.

Scene to 20M 8 antennas, because base band data optical fiber is directly 10G, therefore just needn't need the base band data access module, and directly base band data optical fiber is connected to base band data Replica Selection module, 72 base station cells of the maximum support of platform this moment are connected with the UE terminal, system as shown in Fig. 2 or 4.

In channelization block, the structure of FPGA is with structure shown in Figure 3 in embodiment 1 in the present embodiment, and channel fading parameters also can be provided by the fading parameter administration module, as shown in Figure 9.

Fpga chip in above-described embodiment can be selected the XC7VX690T of Xilinx company, and this fpga chip has 80 road Serdes (SERializer/DESerializer, series connection/deserializer) interface, and every road all supports the following CPRI optical fiber of 13G to connect.Access FPGA converges to the link of inner 10G by the CPRI frame structure to base band data, and can adaptive different MIMO antenna CPRI optical fiber interfaces.

Base band data Replica Selection module realizes copying input and selecting output of the inner base band data of 10G, also can be realized by 9 XC7VX690T fpga chips, and 80 road Serdes interfaces of each FPGA are all worked with 10G speed.At up direction, the base band data after each FPGA reception 8 road is converged, then be copied into 9 parts, output to respectively 9 channel processing module FPGA; At down direction, each FPGA receives the base band data after 72 path channels are processed, and selects 8 the tunnel and outputs to access FPGA as final result.

It is more than concrete enforcement use-case of the present invention, utilize the DSP+FPGA framework, form a large-scale wireless network channel emulation platform, the maximum networking scale of supporting 576 residential quarters * 576 terminals, be fit to the scenario simulation of the following wireless network environment in medium-sized city, and be applicable to different wireless network standards.

One of ordinary skill in the art will appreciate that all or part of step in said method can come the instruction related hardware to complete by program, described program can be stored in computer-readable recording medium, as read-only memory, disk or CD etc.Alternatively, all or part of step of above-described embodiment also can realize with one or more integrated circuits.Correspondingly, each the module/unit in above-described embodiment can adopt the form of hardware to realize, also can adopt the form of software function module to realize.The present invention is not restricted to the combination of the hardware and software of any particular form.

Certainly; the present invention also can have other various embodiments; in the situation that do not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make according to the present invention various corresponding changes and distortion, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.

Claims (10)

1. city wireless network channel emulation test system comprises: n base band data Replica Selection module and n channelizing processing module, wherein:

Each base band data Replica Selection module is used at up direction, will be copied into the n road from the base band data of a plurality of optical interface link inputs, inputs respectively n channelizing processing module; At down direction, the data after the channelizing that receives the output of n channelizing processing module is processed therefrom select the multiple signals identical with optical interface link quantity to export;

Each channelizing processing module, being used for that the n roadbed band data of up input are carried out channelizing processes, comprise: select the part base band data to carry out large scale decline computing and multipath fading computing from the base band data of input, base band data after the decline computing is carried out the multipath delay buffer memory, to the descending base band data Replica Selection module that exports to after all base band data stacks that output to same base band data Replica Selection module.

2. the system as claimed in claim 1 is characterized in that:

Described system also comprises n base band data access module, base band data Replica Selection module of the corresponding connection of each base band data access module, each base band data access module is used for receiving by optical interface link at up direction the base band data of equipment to be tested, described base band data is carried out inputting the base band data Replica Selection module corresponding with this base band data access module after rate transition, and the base band data that is used for receiving at down direction the output of base band data Replica Selection module, carry out exporting after rate transition.

3. system as claimed in claim 1 or 2 is characterized in that:

Described channelizing processing module is realized by logical operation circuit, described logical operation circuit comprises input aerial data selector, an x large scale decline multiplier, a y multipath fading multiplier, a y multidiameter delay buffer area, and output antenna data selector, y=kx, k ∈ [3,18], wherein:

Described input aerial data selector is used for selecting to carry out the base band data that channelizing is processed, and inputs respectively x large scale decline multiplier;

Described large scale decline multiplier, be used for the base band data of input is carried out large scale decline computing, comprise: the base band data that will input multiply by large scale fading factor corresponding to this base band data, and the base band data after large scale decline computing is copied rear y the multipath fading multiplier of inputting respectively;

Described multipath fading multiplier is used for the base band data of input is carried out the multipath fading computing, and comprising: the base band data that will input multiply by the multipath fading factor corresponding to this base band data, the multidiameter delay buffering area that input is corresponding;

Described multidiameter delay buffer area, be used for after will the multipath fading computing of input base band data by given delay parameter delay time buffer memory and merge after the described output antenna data selector of input;

Described output antenna data selector is used for receiving base band data from y multidiameter delay buffering area, the base band data that outputs to same base band data Replica Selection module superposeed, and the data after superposeing to the base band data Replica Selection module output of correspondence.

4. system as claimed in claim 3 is characterized in that:

Described system also comprises n fading parameter administration module, it is used to the large scale decline multiplier in corresponding channelizing processing module that the large scale fading factor is provided, for the multipath fading multiplier in the channelizing processing module of correspondence provides the multipath fading factor, and provide delay parameter for the multidiameter delay buffer area in the channelizing processing module of correspondence.

5. system as claimed in claim 4 is characterized in that:

Described fading parameter administration module is realized by digital signal processor.

6. as claim 1 or 2 or 4 or 5 described systems, it is characterized in that:

Described n 〉=2.

7. system as claimed in claim 6 is characterized in that:

Described n=9.

8. city wireless network channel emulation test method comprises:

Be input to the base band data of same base band data Replica Selection module from a plurality of optical interface links, be copied into the n road by this base band data Replica Selection module, input respectively n channelizing processing module;

Each channelizing processing module selects the part base band data to carry out large scale decline computing and multipath fading computing from the n roadbed band data of input, base band data after the decline computing is carried out the multipath delay buffer memory, to the descending base band data Replica Selection module that exports correspondence to after all base band data stacks that output to same base band data Replica Selection module;

Data after the channelizing of n channelizing processing module output of each base band data Replica Selection module reception is processed are therefrom selected the multiple signals output identical with optical interface link quantity.

9. method as claimed in claim 8 is characterized in that:

Before base band data Replica Selection module copied base band data, described method also comprised:

First after carrying out rate transition, the base band data access module inputs again base band data Replica Selection module from the base band data of a plurality of optical interface link inputs;

Described base band data Replica Selection module selects the multiple signals identical with optical interface link quantity to export the base band data access module to, and this base band data access module carries out exporting after rate transition to the base band data that receives.

10. method as claimed in claim 8 or 9 is characterized in that:

Described channelizing processing module is used for carrying out in the following ways large scale decline computing: the base band data that will input multiply by large scale fading factor corresponding to this base band data;

Described channelizing processing module is used for carrying out in the following ways the multipath fading computing: the base band data that will input multiply by the multipath fading factor corresponding to this base band data;

Described channelizing processing module is used for carrying out in the following ways the multipath delay buffer memory: to the base band data of this input by given delay parameter delay time buffer memory and merging.

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