CN102404755B - Indoor wireless channel model determination method and indoor wireless channel model determination device - Google Patents
Indoor wireless channel model determination method and indoor wireless channel model determination device Download PDFInfo
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- CN102404755B CN102404755B CN201010288935.6A CN201010288935A CN102404755B CN 102404755 B CN102404755 B CN 102404755B CN 201010288935 A CN201010288935 A CN 201010288935A CN 102404755 B CN102404755 B CN 102404755B
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Abstract
The invention discloses an indoor wireless channel model determination method which comprises the following steps of: acquiring the absorptivity of tables and chairs on signal intensity when the tables and the chairs reflect wireless signals, and/or acquiring the absorptivity of walls on signal intensity after the wireless signals transmit the walls. The method further comprises the following steps of: determining the times of the wireless signals sent by terminal equipment reflected by the tables and the chairs and/or the times of the wireless signals transmitting the walls when the wireless signals reach everyplace indoors, and further determining the signal intensity models of wireless channels everyplace indoors according to the determined reflected times and/or transmitting times as well as corresponding absorptivities. The invention further discloses an indoor wireless channel model determination device. The indoor wireless channel model determination method and the indoor wireless channel model determination device can accurately and quickly determine the signal intensity model of an indoor wireless channel. The simplification of modeling is realized; and the determined signal intensity model is accurate and practical.
Description
Technical field
The present invention relates to indoor wireless channels modeling technique, particularly relate to a kind of indoor wireless channel model defining method and device.
Background technology
The nineties in 20th century, the development of wireless access wide band technology was very fast, the market orientation being assigned as the wireless technology of representative with LMDS (LMDS, Local Multipoint Distribution Services) and multichannel multiple spot be small office (SOHO), in/user such as small enterprise, city commercial center.Concrete application as user's indoor equipment (CPE, Customer Premise Equipment), the scenes such as Home eNodeB (HNB, Home NodeB).
1999, Institute of Electrical and Electric Engineers (IEEE, Institute of Electrical and ElectronicsEngineers) set up 802.16 working groups to specialize in wireless access wide band technology specification, target to set up the unified broadband wireless access standard in a whole world.Current IEEE802.16 mainly mentions the broadband wireless access standard of the fixed broadband wireless access standard of two standard: 802.16-2004 and 802.16d and the support mobility of 802.16e.Under the fixing access of IEEE 802.16d specification, user terminal is with the air interface between base station system, the physical layer of main definitions air interface and medium education (MAC, MediumAccess Control) layer.The maximum feature of 802.16e standard is ambulant support.The standard specifies and can support fixing and mobile wide-band wire-less accessing system simultaneously, be operated in and be less than 6GHz and be suitable for ambulant licensed band, can support that user terminal moves with car speed, therefore the fixed wireless access subscriber ability that 802.16d specifies simultaneously is not affected.Wi-Fi full name Wireless Fidelity, also known as 802.11b standard, its great advantage is exactly that transmission speed is higher, can reach 11Mbps, belongs to the short-distance wireless access technology used in office and family.
CPE refers to the equipment being positioned at multi-terminal client premises, is now usually called subscriber terminal equipment, belongs to a type of terminal equipment; CPE is unlike USB softdog (USB dongle), PC (PCMCIA, PersonalComputer Memory Card International Association) card etc. has the interface definition of standard like that, but only have one or more of standard interface, form can define flexibly according to application scenarios.Phone or other service can be provided.Telephone set, CATV set-top-box and digital subscriber line (DSL, Digital SubscriberLine) router are examples the most common.It is exactly mainly apply above-mentioned radio standard to set up client device network, supports mobile broadband wireless access.
Present CPE, service is from single Phonetic Speech Development to the multimedia application such as data, video field, wireless access has been developed into from access in radio and intelligent acess, the network of application comprises telecommunications, broadcasting and TV, Internet etc., Web TV (IPTV, Internet Protocol Television), the networking telephone (VoIP, Voice overInternet Protocol) progressively becomes the general function of broadband CPE.Broadband CPE just shifts from modulator-demodulator leading type to gateway leading type, and CPE has developed into the gateway of complete function, at least can support rear end ALARA Principle home network.
Initial LMDS puts forward as " last one kilometer " solution, because the cost of existing CPE is also higher, is therefore not suitable for independent personal user and uses.It is mainly orientated as: LMDS broadband fixed radio access technology is suitable for applying in the specific regions such as the large city of campus, Internet bar, multi-storey building, new residential area and the density of population.Or for enterprise customer and group user.Towards wideband data integrated service.Due to the traffic handing capacity that LMDS broadband fixed radio access can provide higher bandwidth sum comprehensive, wideband data integrated application can also be provided while data access business is provided.
The application type of CPE usually can be divided into and comprise indoor type and outdoor version.Outdoor version comprises outdoor unit (ODU, Outdoor Unit) and indoor unit (IDU, Indoor Unit), ODU and IDU is connected by specific mode.CPE is applicable to stationary applications, normally outdoor unit is placed in the places such as outdoor roof, owing to adopting the directional antenna of high-gain, when transmitting power is lower, also longer transmission range can be reached, all good laser propagation effect can be reached when sighting distance and non line of sight.Indoor type CPE is generally placed in desktop, and contour structures can according to the definition of user and device fabrication business, and pattern is very many.Substantially be divided into vertical and horizontal.
As can be seen here, in the application scenarios of CPE, indoor scene occupies part and parcel.Because no matter CPE is placed in indoor or outdoor, all there is indoor unit, have pith to need in office work.
The development of outdoor propagation model experienced by very long period, and has formed that some are known, the model of extensive use, as Hata model, and Cost model etc.By contrast, indoor channel model, due to its thousands of different indoor environment and complicated radio propagation path, develops always relatively slow.The diversity of indoor environment is: the size in each room is different, room components ornaments and position different; The material of indoor object is different; Indoor position is placed in different by investigation object.These factors determine that radio radiation to be carried out in indoor reflecting, reflects, diffraction and scattering etc., thus cause path and signal strength signal intensity different.
Due to the complexity of indoor environment, the structure of indoor wireless electric model is the Focal point and difficult point in wireless research always.At present, not yet there is preferably indoor wireless electric model for reference or use.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of indoor wireless channel model defining method and device, can set up the signal strength model of indoor wireless channels accurately and quickly.
For achieving the above object, technical scheme of the present invention is achieved in that
A kind of indoor wireless channel model defining method, the absorptivity to signal strength signal intensity during acquisition tables and chairs reflected radio signal, and/or, obtain wireless signal transmission body of wall back wall to the absorptivity of signal strength signal intensity; Described method also comprises:
Determine the tables and chairs order of reflection that the indoor wireless signal everywhere of wireless signal arrival that terminal equipment is launched experiences and/or transmission body of wall number of times, with determined order of reflection and/or transmission number of times, and the absorptivity of correspondence, determine the signal strength model of indoor wireless channel everywhere further.
Preferably, during described acquisition tables and chairs reflected radio signal, the absorptivity of signal strength signal intensity is specially:
Using the mean value of the signal strength signal intensity absorptivity during tables and chairs reflected radio signal of various material as the absorptivity setting up signal strength model;
Or arrange the rank of absorptivity, the absorptivity for each rank arranges corresponding absorptivity numerical value; Calculate the signal strength signal intensity absorptivity numerical value during tables and chairs reflected radio signal of various material, and determine by calculated absorptivity numerical value the absorptivity rank that the tables and chairs of described various material are corresponding.
Preferably, the absorptivity of described acquisition wireless signal transmission body of wall back wall to wireless signal is specially:
After the various body of wall of wireless signal transmission described various body of wall to the mean value of the absorptivity of signal strength signal intensity as the absorptivity setting up signal strength model;
Or arrange the rank of absorptivity, the absorptivity for each rank arranges corresponding absorptivity numerical value; After calculating the various body of wall of wireless signal transmission, described various body of wall is to the absorptivity numerical value of signal strength signal intensity, and determines by calculated absorptivity numerical value the absorptivity rank that described various body of wall is corresponding.
Preferably, be a to the absorptivity of signal strength signal intensity during tables and chairs reflected radio signal, wireless signal transmission body of wall back wall is to the absorptivity b of signal strength signal intensity; Describedly determine that the signal strength model of indoor somewhere wireless channel is specially: E × (1-a)
n× (1-b)
m; Wherein, E is signal strength signal intensity during described terminal equipment institute wireless signal emission; N is the tables and chairs order of reflection that the wireless signal of described terminal equipment arrives certain place indoor experience, is 0 without tables and chairs reflex time n; M is the number of times that the wireless signal of described terminal equipment arrives the transmission body of wall of certain place indoor experience, and during non-transmission body of wall, m is 0.
Preferably, described method also comprises:
Determine wireless signal absorptivity c to signal strength signal intensity when glass refraction further, determine that wireless signal that described terminal equipment is launched arrives that indoor somewhere wireless signal experiences through glass refraction number of times p;
Describedly determine that the signal strength model of indoor somewhere wireless channel is specially: E × (1-a)
n× (1-b)
m× (1-c)
p, be 0 without p during glass refraction.
Preferably, described method also comprises:
Determine that wireless signal is through the absorptivity d of body of wall reflex time to signal strength signal intensity further, determine the body of wall order of reflection q that wireless signal that described terminal equipment is launched arrives indoor somewhere wireless signal and experiences;
Describedly determine that the signal strength model of indoor somewhere wireless channel is specially: E × (1-a)
n× (1-b)
m× (1-c)
p× (1-d)
q, be 0 without body of wall reflex time q.
A kind of indoor wireless channel model determining device, comprises acquiring unit, the first determining unit and the second determining unit; Wherein,
Acquiring unit, the absorptivity to signal strength signal intensity during for obtaining tables and chairs reflected radio signal, and/or wireless signal transmission body of wall back wall is to the absorptivity of signal strength signal intensity;
First determining unit, for determining the tables and chairs order of reflection that the indoor wireless signal everywhere of wireless signal arrival that terminal equipment is launched experiences and/or transmission body of wall number of times;
Second determining unit, for described first order of reflection that determining unit is determined and/or transmission number of times, and the absorptivity of correspondence, determine the signal strength model of indoor wireless channel everywhere further.
Preferably, described acquiring unit comprises computation subunit further and determines subelement; Wherein,
Computation subunit, for calculating the signal strength signal intensity absorptivity during tables and chairs reflected radio signal of various material; Or after calculating wireless signal transmission various body of wall described various body of wall to the absorptivity of signal strength signal intensity;
Determine subelement, the mean value of the absorptivity calculated using described computation subunit is as the absorptivity setting up signal strength model.
Preferably, described acquiring unit comprise further subelement, computation subunit are set, determine subelement and obtain subelement; Wherein,
Arrange subelement, for arranging the rank of absorptivity, the absorptivity for each rank arranges corresponding absorptivity numerical value;
Computation subunit, for calculating the signal strength signal intensity absorptivity numerical value during tables and chairs reflected radio signal of various material, or after calculating the various body of wall of wireless signal transmission described various body of wall to the absorptivity numerical value of signal strength signal intensity;
Determine subelement, determine the tables and chairs of described various material or absorptivity rank corresponding to described various body of wall by calculated absorptivity numerical value;
Obtain subelement, for determining corresponding absorptivity with concrete tables and chairs or body of wall.
Preferably, be a to the absorptivity of signal strength signal intensity during tables and chairs reflected radio signal, wireless signal transmission body of wall back wall is to the absorptivity b of signal strength signal intensity; Described second determining unit determines that the signal strength model of indoor somewhere wireless channel is: E × (1-a)
n× (1-b)
m; Wherein, E is signal strength signal intensity during described terminal equipment institute wireless signal emission; N is the tables and chairs order of reflection that the wireless signal of described terminal equipment arrives certain place indoor experience, is 0 without tables and chairs reflex time n; M is the number of times that the wireless signal of described terminal equipment arrives the transmission body of wall of certain place indoor experience, and during non-transmission body of wall, m is 0.
Preferably, described first determining unit determines wireless signal absorptivity c to signal strength signal intensity when glass refraction further, determine that wireless signal that described terminal equipment is launched arrives that indoor somewhere wireless signal experiences through glass refraction number of times p;
Described second determining unit determines that the signal strength model of indoor somewhere wireless channel is specially further: E × (1-a)
n× (1-b)
m× (1-c)
p, be 0 without p during glass refraction.
Preferably, described first determining unit determines that wireless signal is through the absorptivity d of body of wall reflex time to signal strength signal intensity further, determines the body of wall order of reflection q that wireless signal that described terminal equipment is launched arrives indoor somewhere wireless signal and experiences;
Described second determining unit determines that the signal strength model of indoor somewhere wireless channel is specially further: E × (1-a)
n× (1-b)
m× (1-c)
p× (1-d)
q, be 0 without body of wall reflex time q.
In the present invention, by obtaining indoor, the absorptivity of article to the signal strength signal intensity of wireless signal is respectively set, determine further wireless signal that terminal equipment launches arrive indoor everywhere time, what wireless signal experienced respectively arranges item condition, can determine the signal strength model of indoor wireless channels accurately and quickly.Present invention achieves the simplification to modeling, determined signal strength model is accurately practical.
Accompanying drawing explanation
Fig. 1 is the wireless signal path schematic diagram that CPE is placed in room;
Fig. 2 is the wireless signal path schematic diagram that CPE is placed in outside room;
Fig. 3 is the composition structural representation of indoor wireless channel model determining device of the present invention.
Embodiment
Basic thought of the present invention is, by obtaining indoor, the absorptivity of article to the signal strength signal intensity of wireless signal is respectively set, determine further wireless signal that terminal equipment launches arrive indoor everywhere time, what wireless signal experienced respectively arranges item condition, such as wireless signal is through the reflection of tables and chairs or body of wall, transmitted through body of wall etc., as long as the present invention determines the number of times through reflection or transmission, the model of the signal strength signal intensity of indoor wireless signal everywhere can be determined.
For making the object, technical solutions and advantages of the present invention clearly understand, by the following examples also with reference to accompanying drawing, the present invention is described in more detail.
The present invention mainly sets up signal strength model for CPE, and CPE is mainly applied to the group user such as office building, enterprise, its applied environment is mainly indoor.Specific to indoor, the facility in each room and the position of laying for goods different, some tables and chairs is put than comparatively dense, and some is more open.But on the whole, indoor radio interference is mainly from reflection, refraction, diffraction and the scattering of the tables and chairs, glass, wall etc. of indoor.The mainly reflection that tables and chairs produce, glass produces reflection and refraction, and metope also mainly reflects in this case.The propagation path of the wireless signal that CPE launches is different with the difference of the different putting position of these objects.When if the interior space is larger, relatively spacious, the interference of radio signal propagation is relatively little, if the interior space is smaller, object is arranged than comparatively dense, then radio signal propagation interference is relatively large, more difficult assessment.
Fig. 1 is the wireless signal path schematic diagram that CPE is placed in room, as shown in Figure 1, as in small office, the CPE of medium-sized and small enterprises, city commercial center applications, when being placed in indoor, the most importantly reflection that produces such as tables and chairs, body of wall and glass and refraction etc.
Indoor wireless channel model defining method of the present invention, absorptivity to signal strength signal intensity when first needing to obtain tables and chairs reflected radio signal, wireless signal transmission body of wall back wall to the absorptivity of signal strength signal intensity, and wireless signal when glass refraction to the absorptivity of signal strength signal intensity.Here, above-mentioned absorptivity can be determined in the following manner.
Using the mean value of the signal strength signal intensity absorptivity during tables and chairs reflected radio signal of various material as the absorptivity setting up signal strength model; Here, its absorptivity to wireless signal can be measured when reflected radio signal to the tables and chairs of various material; Or, the absorptivity of tables and chairs when reflected radio signal to signal strength signal intensity of the various materials measured is found out by relevant handbook.It will be appreciated by those skilled in the art that by relevant analogue system or special measurement means, determine that various tables and chairs are easily realize when reflected radio signal to the absorptivity of wireless signal.The present invention repeats no more and determines that each material tables and chairs realize details to wireless signal absorptivity.
Or arrange the rank of absorptivity, the absorptivity for each rank arranges corresponding absorptivity numerical value; Calculate the signal strength signal intensity absorptivity numerical value during tables and chairs reflected radio signal of various material, and determine by calculated absorptivity numerical value the absorptivity rank that the tables and chairs of described various material are corresponding.This mode, is equivalent to the table of comparisons setting up tables and chairs absorptivity by material, is about to the material little to wireless signal absorptivity difference and is classified as one group, for the tables and chairs being classified as a group, use identical absorptivity numerical value.
For the reflection of body of wall, using the mean value of signal strength signal intensity absorptivity during various body of wall reflected radio signal as the absorptivity setting up signal strength model; Or arrange the rank of absorptivity, the absorptivity for each rank arranges corresponding absorptivity numerical value; Calculate signal strength signal intensity absorptivity numerical value during various body of wall reflected radio signal, and determine by calculated absorptivity numerical value the absorptivity rank that the tables and chairs of described various material are corresponding.Generally speaking, various body of wall is substantially identical to the reflection case of wireless signal, can common wall reflected radio signal time to the absorptivity of wireless signal as the absorptivity of various body of wall to wireless signal.
For glass, because the absorptivity of various glass to wireless signal is lower, can the differentiation process by the difference of glass material.Can using simple glass to the absorptivity of wireless signal as various material glass to the absorptivity of wireless signal.
Suppose that the wireless signal strength that CPE launches is E, be a to the absorptivity of wireless signal during tables and chairs reflected radio signal, as shown in Figure 1, the signal strength signal intensity of the wireless signal that the user terminal near tables and chairs receives will be E × (1-a).Namely the wireless signal that the mobile terminal thinking near tables and chairs receives has been through the primary event of tables and chairs.Fig. 1 is the indoor channel model simplified most, and dash area desk is a row.More complicated as wireless signal need in the path that experiences through tables and chairs reflection more than twice time, during as reflection n time, the signal strength signal intensity of corresponding indoor radio signal will be E × (1-a)
n.
When above-mentioned wireless signal also need through body of wall reflection or need transmitted through glass time, as long as to determine through body of wall reflex time body of wall to the absorptivity of the signal strength signal intensity of wireless signal and transmitted through the absorptivity of glass during glass to wireless signal, the model of indoor signal strength signal intensity everywhere can be determined easily.
Assumed wireless signal when glass refraction to the absorptivity c of signal strength signal intensity, determine that wireless signal that described CPE launches arrives that indoor somewhere wireless signal experiences through glass refraction number of times p; Determine that wireless signal is through the absorptivity d of body of wall reflex time to signal strength signal intensity, determine the body of wall order of reflection q that wireless signal that described CPE launches arrives indoor somewhere wireless signal and experiences;
Describedly determine that the signal strength model of indoor wireless channel is everywhere specially: E × (1-a)
n× (1-c)
p× (1-d)
q.Wherein, being 0 without tables and chairs reflex time n, is 0 without p during glass refraction, is 0 without body of wall reflex time q.
The article that the present invention only needs to determine that the wireless signal in indoor somewhere experiences and possible number of times, wireless signal is after the reflection or transmission object of certain article, determine the absorptivity of respective objects to wireless signal, then by above-mentioned strength model, the signal strength signal intensity at indoor any place can be determined.
When CPE is placed in outside room.In this case the interference of wireless signal mainly by body of wall time, and wireless signal meet with refraction and diffraction.The radio wave be sent to through body of wall like this after the room of wall another side is just much weak.The facility of adding in room is ever-changing.But on the whole, it is the same that indoor radio interference and CPE are directly placed in indoor situation, mainly from reflection, the refraction of the tables and chairs, body of wall, glass etc. of indoor, diffraction and scattering etc.The mainly reflection that tables and chairs produce, glass produces reflection and refraction, and metope also mainly reflects in this case.The propagation path of wireless signal is different due to the putting position difference of these objects.
Fig. 2 is the wireless signal path schematic diagram that CPE is placed in outside room, as shown in Figure 2, CPE is placed in outside room, therefore, for the wireless signal of indoor, mainly the wireless signal of CPE transmitting is first transmitted through body of wall, enters indoor its signal strength model rear identical with the determination mode of the wireless signal strength model of above-mentioned indoor.
Determine that the method for the indoor wireless channel model under Fig. 1 situation is identical with aforementioned, this example is also first determine that indoor various material is to the absorptivity of wireless signal, by determined each absorptivity, and the wireless signal of CPE transmitting arrives the number of times of the object of indoor each place experience, determines the signal strength model of the wireless channel in indoor somewhere.
CPE is placed in the situation outside room, for the impact of wireless signal, mainly wireless signal is transmitted through the absorption of body of wall back wall to wireless signal.Therefore, after need determining wireless signal transmission body of wall, body of wall, to the absorptivity of wireless signal, specifically determines that mode is as follows:
After the various body of wall of wireless signal transmission described various body of wall to the mean value of the absorptivity of signal strength signal intensity as the absorptivity setting up signal strength model; Or arrange the rank of absorptivity, the absorptivity for each rank arranges corresponding absorptivity numerical value; After calculating the various body of wall of wireless signal transmission, described various body of wall is to the absorptivity numerical value of signal strength signal intensity, and determines by calculated absorptivity numerical value the absorptivity rank that described various body of wall is corresponding.Here to the determination mode of body of wall absorptivity with aforementioned determining that to wireless signal reflection or when reflecting the mode of corresponding object to the absorptivity of wireless signal is identical.Repeat no more it and realize details.
Be a to the absorptivity of signal strength signal intensity when supposing tables and chairs reflected radio signal, wireless signal transmission body of wall back wall is to the absorptivity b of signal strength signal intensity; Then determine that the signal strength model of indoor somewhere wireless channel is specially: E × (1-a)
n× (1-b)
m; Wherein, E is signal strength signal intensity during described CPE institute wireless signal emission; N is the tables and chairs order of reflection that the wireless signal of described CPE arrives certain place indoor experience, is 0 without tables and chairs reflex time n; M is the number of times that the wireless signal of described CPE arrives the transmission body of wall of certain place indoor experience, and during non-transmission body of wall, m is 0.
Assumed wireless signal when glass refraction to the absorptivity c of signal strength signal intensity, determine that wireless signal that described CPE launches arrives that indoor somewhere wireless signal experiences through glass refraction number of times p; Determine that wireless signal is through the absorptivity d of body of wall reflex time to signal strength signal intensity, determine the body of wall order of reflection q that wireless signal that described CPE launches arrives indoor somewhere wireless signal and experiences;
Describedly determine that the signal strength model of indoor wireless channel is everywhere specially: E × (1-a)
n× (1-b)
m× (1-c)
p.Wherein, being 0 without tables and chairs reflex time n, is 0 without p during glass refraction.
Assumed wireless signal, through the absorptivity d of body of wall reflex time to signal strength signal intensity, determines the body of wall order of reflection q that wireless signal that described CPE launches arrives indoor somewhere wireless signal and experiences; Then the signal strength model of indoor somewhere wireless channel is specially: E × (1-a)
n× (1-b)
m× (1-c)
p× (1-d)
q, be 0 without body of wall reflex time q.
In the present invention, also can determine the signal strength model of the indoor wireless channels of HNB in above-mentioned same mode.The present invention repeats no more its deterministic process.Terminal equipment in the present invention can be any terminal with signal emissivities, is not limited to CPE and HNB.
Fig. 3 is the composition structural representation of indoor wireless channel model determining device of the present invention, and as shown in Figure 3, indoor wireless channel model determining device of the present invention comprises acquiring unit 30, first determining unit 31 and the second determining unit 32; Wherein,
Acquiring unit 30, the absorptivity to signal strength signal intensity during for obtaining tables and chairs reflected radio signal, and/or wireless signal transmission body of wall back wall is to the absorptivity of signal strength signal intensity;
First determining unit 31, for determining the tables and chairs order of reflection that the indoor wireless signal everywhere of wireless signal arrival that CPE launches experiences and/or transmission body of wall number of times;
Second determining unit 32, for the first determining unit 31 determine order of reflection and/or transmission number of times, and the absorptivity of correspondence, determine the signal strength model of indoor wireless channel everywhere further.
Above-mentioned acquiring unit 30 comprises computation subunit (not shown) further and determines subelement (not shown); Wherein,
Computation subunit, for calculating the signal strength signal intensity absorptivity during tables and chairs reflected radio signal of various material; Or after calculating wireless signal transmission various body of wall described various body of wall to the absorptivity of signal strength signal intensity;
Determine subelement, the mean value of the absorptivity calculated using described computation subunit is as the absorptivity setting up signal strength model.
Above-mentioned acquiring unit 30 comprise further subelement (not shown), computation subunit (not shown) are set, determine subelement (not shown) and obtain subelement (not shown); Wherein,
Arrange subelement, for arranging the rank of absorptivity, the absorptivity for each rank arranges corresponding absorptivity numerical value;
Computation subunit, for calculating the signal strength signal intensity absorptivity numerical value during tables and chairs reflected radio signal of various material, or after calculating the various body of wall of wireless signal transmission described various body of wall to the absorptivity numerical value of signal strength signal intensity;
Determine subelement, determine the tables and chairs of described various material or absorptivity rank corresponding to described various body of wall by calculated absorptivity numerical value;
Obtain subelement, for determining corresponding absorptivity with concrete tables and chairs or body of wall.
Be a to the absorptivity of signal strength signal intensity during tables and chairs reflected radio signal, wireless signal transmission body of wall back wall is to the absorptivity b of signal strength signal intensity; Second determining unit 32 determines that the signal strength model of indoor somewhere wireless channel is: E × (1-a)
n× (1-b)
m; Wherein, E is signal strength signal intensity during described CPE institute wireless signal emission; N is the tables and chairs order of reflection that the wireless signal of described CPE arrives certain place indoor experience, is 0 without tables and chairs reflex time n; M is the number of times that the wireless signal of described CPE arrives the transmission body of wall of certain place indoor experience, and during non-transmission body of wall, m is 0.
First determining unit 31 determines wireless signal absorptivity c to signal strength signal intensity when glass refraction further, determine that wireless signal that described CPE launches arrives that indoor somewhere wireless signal experiences through glass refraction number of times p;
Second determining unit 32 determines that the signal strength model of indoor somewhere wireless channel is specially further: E × (1-a)
n× (1-b)
m× (1-c)
p, be 0 without p during glass refraction.
First determining unit 31 determines that wireless signal is through the absorptivity d of body of wall reflex time to signal strength signal intensity further, determines the body of wall order of reflection q that wireless signal that described CPE launches arrives indoor somewhere wireless signal and experiences;
Second determining unit 32 determines that the signal strength model of indoor somewhere wireless channel is specially further: E × (1-a)
n× (1-b)
m× (1-c)
p× (1-d)
q, be 0 without body of wall reflex time q.
Those skilled in the art are to be understood that, indoor wireless channel model determining device shown in Fig. 3 of the present invention designs for realizing aforesaid indoor wireless channel model defining method, and the practical function of above-mentioned each processing unit can refer to the associated description of preceding method and understands.The function of each processing unit in figure realizes by the program run on processor, also realizes by concrete logical circuit.
The above, be only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.
Claims (10)
1. an indoor wireless channel model defining method, is characterized in that, the absorptivity to signal strength signal intensity during acquisition tables and chairs reflected radio signal, and/or, obtain wireless signal transmission body of wall back wall to the absorptivity of signal strength signal intensity; Described method also comprises:
Determine the tables and chairs order of reflection that the indoor wireless signal everywhere of wireless signal arrival that terminal equipment is launched experiences and/or transmission body of wall number of times, with determined order of reflection and/or transmission number of times, and the absorptivity of correspondence, determine that the signal strength model of indoor wireless channel is everywhere specially further: E × (1-a)
n× (1-b)
m; Wherein, to the absorptivity of signal strength signal intensity when a is tables and chairs reflected radio signal, b is that wireless signal transmission body of wall back wall is to the absorptivity of signal strength signal intensity; E is signal strength signal intensity during described terminal equipment institute wireless signal emission; N is the tables and chairs order of reflection that the wireless signal of described terminal equipment arrives certain place indoor experience, is 0 without tables and chairs reflex time n; M is the number of times that the wireless signal of described terminal equipment arrives the transmission body of wall of certain place indoor experience, and during non-transmission body of wall, m is 0.
2. method according to claim 1, is characterized in that, is specially during described acquisition tables and chairs reflected radio signal to the absorptivity of signal strength signal intensity:
Using the mean value of the signal strength signal intensity absorptivity during tables and chairs reflected radio signal of various material as the absorptivity setting up signal strength model;
Or arrange the rank of absorptivity, the absorptivity for each rank arranges corresponding absorptivity numerical value; Calculate the signal strength signal intensity absorptivity numerical value during tables and chairs reflected radio signal of various material, and determine by calculated absorptivity numerical value the absorptivity rank that the tables and chairs of described various material are corresponding.
3. method according to claim 1, is characterized in that, the absorptivity of described acquisition wireless signal transmission body of wall back wall to wireless signal is specially:
After the various body of wall of wireless signal transmission described various body of wall to the mean value of the absorptivity of signal strength signal intensity as the absorptivity setting up signal strength model;
Or arrange the rank of absorptivity, the absorptivity for each rank arranges corresponding absorptivity numerical value; After calculating the various body of wall of wireless signal transmission, described various body of wall is to the absorptivity numerical value of signal strength signal intensity, and determines by calculated absorptivity numerical value the absorptivity rank that described various body of wall is corresponding.
4. method according to claim 1, is characterized in that, described method also comprises:
Determine wireless signal absorptivity c to signal strength signal intensity when glass refraction further, determine that wireless signal that described terminal equipment is launched arrives that indoor somewhere wireless signal experiences through glass refraction number of times p;
Describedly determine that the signal strength model of indoor somewhere wireless channel is specially: E × (1-a)
n× (1-b)
m× (1-c)
p, be 0 without p during glass refraction.
5. method according to claim 4, is characterized in that, described method also comprises:
Determine that wireless signal is through the absorptivity d of body of wall reflex time to signal strength signal intensity further, determine the body of wall order of reflection q that wireless signal that described terminal equipment is launched arrives indoor somewhere wireless signal and experiences;
Describedly determine that the signal strength model of indoor somewhere wireless channel is specially: E × (1-a)
n× (1-b)
m× (1-c)
p× (1-d)
q, be 0 without body of wall reflex time q.
6. an indoor wireless channel model determining device, is characterized in that, described device comprises acquiring unit, the first determining unit and the second determining unit; Wherein,
Acquiring unit, the absorptivity to signal strength signal intensity during for obtaining tables and chairs reflected radio signal, and/or wireless signal transmission body of wall back wall is to the absorptivity of signal strength signal intensity;
First determining unit, for determining the tables and chairs order of reflection that the indoor wireless signal everywhere of wireless signal arrival that terminal equipment is launched experiences and/or transmission body of wall number of times;
Second determining unit, for described first order of reflection that determining unit is determined and/or transmission number of times, and the absorptivity of correspondence, determine that the signal strength model of indoor wireless channel is everywhere: E × (1-a) further
n× (1-b)
m; Wherein, to the absorptivity of signal strength signal intensity when a is tables and chairs reflected radio signal, b is that wireless signal transmission body of wall back wall is to the absorptivity of signal strength signal intensity; E is signal strength signal intensity during described terminal equipment institute wireless signal emission; N is the tables and chairs order of reflection that the wireless signal of described terminal equipment arrives certain place indoor experience, is 0 without tables and chairs reflex time n; M is the number of times that the wireless signal of described terminal equipment arrives the transmission body of wall of certain place indoor experience, and during non-transmission body of wall, m is 0.
7. device according to claim 6, is characterized in that, described acquiring unit comprises computation subunit further and determines subelement; Wherein,
Computation subunit, for calculating the signal strength signal intensity absorptivity during tables and chairs reflected radio signal of various material; Or after calculating wireless signal transmission various body of wall described various body of wall to the absorptivity of signal strength signal intensity;
Determine subelement, the mean value of the absorptivity calculated using described computation subunit is as the absorptivity setting up signal strength model.
8. device according to claim 7, is characterized in that, described acquiring unit comprise further subelement, computation subunit are set, determine subelement and obtain subelement; Wherein,
Arrange subelement, for arranging the rank of absorptivity, the absorptivity for each rank arranges corresponding absorptivity numerical value;
Computation subunit, for calculating the signal strength signal intensity absorptivity numerical value during tables and chairs reflected radio signal of various material, or after calculating the various body of wall of wireless signal transmission described various body of wall to the absorptivity numerical value of signal strength signal intensity;
Determine subelement, determine the tables and chairs of described various material or absorptivity rank corresponding to described various body of wall by calculated absorptivity numerical value;
Obtain subelement, for determining corresponding absorptivity with concrete tables and chairs or body of wall.
9. device according to claim 6, it is characterized in that, described first determining unit determines wireless signal absorptivity c to signal strength signal intensity when glass refraction further, determine that wireless signal that described terminal equipment is launched arrives that indoor somewhere wireless signal experiences through glass refraction number of times p;
Described second determining unit determines that the signal strength model of indoor somewhere wireless channel is specially further: E × (1-a)
n× (1-b)
m× (1-c)
p, be 0 without p during glass refraction.
10. device according to claim 9, it is characterized in that, described first determining unit determines that wireless signal is through the absorptivity d of body of wall reflex time to signal strength signal intensity further, determines the body of wall order of reflection q that wireless signal that described terminal equipment is launched arrives indoor somewhere wireless signal and experiences;
Described second determining unit determines that the signal strength model of indoor somewhere wireless channel is specially further: E × (1-a)
n× (1-b)
m× (1-c)
p× (1-d)
q, be 0 without body of wall reflex time q.
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