CN102404755A - 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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- CN102404755A CN102404755A CN2010102889356A CN201010288935A CN102404755A CN 102404755 A CN102404755 A CN 102404755A CN 2010102889356 A CN2010102889356 A CN 2010102889356A CN 201010288935 A CN201010288935 A CN 201010288935A CN 102404755 A CN102404755 A CN 102404755A
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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 the indoor wireless channels modeling technique, relate in particular to a kind of indoor wireless channels model and confirm method and device.
Background technology
The nineties in 20th century, the development of wireless access wide band technology was very fast; The market orientation that is 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 such as user's indoor equipment (CPE, Customer Premise Equipment), Home eNodeB scenes such as (HNB, Home NodeB).
1999; Institute of Electrical and Electric Engineers (IEEE; Institute of Electrical and ElectronicsEngineers) having set up 802.16 working groups specializes in the wireless access wide band technology standard, and target is to set up a broadband wireless access standard that the whole world is unified.At present IEEE802.16 mentions that mainly fixed broadband wireless that two standard: 802.16-2004 are 802.16d inserts the broadband wireless access standard of the support mobility of standard and 802.16e.IEEE 802.16d standard fixedly under the access user terminal mainly defined the physical layer and medium access control (MAC, the MediumAccess Control) layer of air interface with the air interface between the base station system.802.16e the maximum characteristics of standard are ambulant support.This standard code can support fixing simultaneously and mobile wide-band wire-less accessing system; Be operated in 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 of 802.16d regulation is not affected simultaneously.Wi-Fi full name Wireless Fidelity claims the 802.11b standard again, and its great advantage is exactly that transmission speed is higher, can reach 11Mbps, belongs to the short-distance wireless access technology of in office and family, using.
CPE is meant the equipment that is positioned at the terminal use guard station, is called subscriber terminal equipment usually, belongs to a type of terminal equipment at present; CPE is unlike USB softdog (USB dongle), PC (PCMCIA; PersonalComputer Memory Card International Association) that kind such as card has the interface definition of standard; But have only one or more of standard interface, form can define according to application scenarios flexibly.Phone or other service can be provided.Telephone set, CATV set-top-box and digital subscriber line (DSL, Digital SubscriberLine) router is a common example the most.It mainly is exactly to use above-mentioned radio standard to set up the client device network, supports mobile broadband wireless to insert.
Present CPE; Service has developed into multimedia application fields such as data, video from single voice; Developed into wireless access from wired access and optical fiber access, 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 to the gateway leading type from the modulator-demodulator leading type, and CPE has developed into the gateway of complete function, but can support rear end managing family network at least.
Initial LMDS puts forward as " last kilometer " solution, because the cost of existing CPE is also higher, therefore is not suitable for independent personal user and uses.It is mainly orientated as: LMDS broadband fixed wireless access technology is suitable for using in the big specific regions such as city of campus, Internet bar, multi-storey building, newly-built residential quarters and the density of population.Perhaps to enterprise customer and group user.Towards the wideband data integrated service.Because the LMDS broadband fixed wireless inserts higher bandwidth and comprehensive traffic handing capacity can be provided, when the data access service is provided, the wideband data integrated application can also be provided.
The application type of CPE can be divided into usually and comprise indoor type and outdoor version.Outdoor version comprises outdoor unit (ODU, Outdoor Unit) and indoor unit (IDU, Indoor Unit), and ODU and IDU connect through specific mode.CPE is fit to fixation application; Normally outdoor unit is placed outdoor places such as roof, owing to adopt the directional antenna of high-gain, under the lower situation of transmitting power; Also can reach long transmission range, under the situation of sighting distance and non line of sight, all can reach laser propagation effect preferably.Indoor type CPE generally places desktop, and contour structures can be according to user and device fabrication merchant's definition, and pattern is very many.Be divided into vertical and horizontal substantially.
This shows that in the application scenarios of CPE, indoor scene has occupied part and parcel.Because, all have indoor unit, all there is the pith need be in office work no matter CPE places indoorly or outdoor.
Very long period has been experienced in the development of outdoor propagation model, and has formed that some are known, the model of extensive use, and like the Hata model, Cost model etc.By contrast, the indoor channel model is because its thousands of indoor environments that have nothing in common with each other and complicated radio propagation path develop slow relatively always.The diversity of indoor environment is: the size in each room has nothing in common with each other, and indoor device ornaments and position have nothing in common with each other; The material of indoor object has nothing in common with each other; Being investigated object places indoor position to have nothing in common with each other.These factors determined the radio radiation meeting indoorly reflect, refraction, diffraction and scattering etc., thereby cause path and signal strength signal intensity to have nothing in common with each other.
Because the complexity of indoor environment, the structure of indoor wireless electric model is emphasis and the difficult point in the wireless research always.At present, there is not preferable indoor wireless electric model for reference or use as yet.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of indoor wireless channels model to confirm 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 channels model is confirmed method, when obtaining tables and chairs reflections wireless signal to the absorptivity of signal strength signal intensity, and/or, obtain the absorptivity of wireless signal transmission body of wall back wall to signal strength signal intensity; Said method also comprises:
The wireless signal of confirming the terminal equipment emission arrives indoor everywhere tables and chairs order of reflection that wireless signal experienced and/or transmission body of wall number of times; With definite order of reflection of institute and/or transmission number of times; And corresponding absorptivity, the further signal strength model of definite indoor wireless channel everywhere.
Preferably, said when obtaining tables and chairs reflections wireless signal the absorptivity to signal strength signal intensity be specially:
The mean value of the signal strength signal intensity absorptivity during with the tables and chairs of various materials reflection wireless signal is as setting up the absorptivity that signal strength model is used;
Perhaps, the rank of absorptivity is set, for each other absorptivity of level is provided with corresponding absorptivity numerical value; Signal strength signal intensity absorptivity numerical value when calculating the tables and chairs reflections wireless signal of various materials, and confirm the corresponding absorptivity rank of tables and chairs of said various materials by the absorptivity numerical value that is calculated.
Preferably, the said wireless signal transmission body of wall back wall that obtains is specially the absorptivity of wireless signal:
With said various bodies of wall behind the various bodies of wall of wireless signal transmission to the mean value of the absorptivity of signal strength signal intensity as setting up the absorptivity that signal strength model is used;
Perhaps, the rank of absorptivity is set, for each other absorptivity of level is provided with corresponding absorptivity numerical value; Calculate behind the various bodies of wall of wireless signal transmission said various bodies of wall to the absorptivity numerical value of signal strength signal intensity, and confirm the corresponding absorptivity rank of said various body of wall by the absorptivity numerical value that is calculated.
Preferably, the absorptivity to signal strength signal intensity during tables and chairs reflection wireless signal is a, and wireless signal transmission body of wall back wall is to the absorptivity b of signal strength signal intensity; The signal strength model of said definite indoor somewhere wireless channel is specially: E * (1-a)
n* (1-b)
mWherein, E by said terminal equipment the signal strength signal intensity during the emission wireless signal; N is the tables and chairs order of reflection that the wireless signal of said terminal equipment arrives indoor certain place experience, is 0 without tables and chairs reflex time n; M is the number of times that the wireless signal of said terminal equipment arrives the transmission body of wall of indoor certain place experience, and m is not 0 during the transmission body of wall.
Preferably, said method also comprises:
Further confirm wireless signal when glass reflect to the absorptivity c of signal strength signal intensity, what the wireless signal of confirming said terminal equipment emission arrived that indoor somewhere wireless signal experienced reflects number of times p through glass;
The signal strength model of said definite indoor somewhere wireless channel is specially: E * (1-a)
n* (1-b)
m* (1-c)
p, p is 0 when reflecting without glass.
Preferably, said method also comprises:
Further confirm wireless signal through the absorptivity d of body of wall reflex time, confirm that the wireless signal of said terminal equipment emission arrives the body of wall order of reflection q that indoor somewhere wireless signal is experienced signal strength signal intensity;
The signal strength model of said definite 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 channels model is confirmed device, comprises acquiring unit, first definite unit and second definite unit; Wherein,
Acquiring unit, to the absorptivity of signal strength signal intensity, and/or wireless signal transmission body of wall back wall is to the absorptivity of signal strength signal intensity when being used to obtain tables and chairs reflection wireless signal;
First confirms the unit, is used for confirming that the wireless signal of terminal equipment emission arrives indoor everywhere tables and chairs order of reflection that wireless signal experienced and/or transmission body of wall number of times;
Second confirms the unit, be used for said first definite unit definite order of reflection of institute and/or the transmission number of times, and corresponding absorptivity, the further signal strength model of definite indoor wireless channel everywhere.
Preferably, said acquiring unit further comprises computation subunit and definite subelement; Wherein,
Computation subunit, the signal strength signal intensity absorptivity when being used to calculate the tables and chairs reflection wireless signal of various materials; Or calculate behind the various bodies of wall of wireless signal transmission said various bodies of wall to the absorptivity of signal strength signal intensity;
Confirm subelement, the mean value of the absorptivity of being calculated with said computation subunit is as setting up the absorptivity that signal strength model is used.
Preferably, said acquiring unit further comprises and subelement, computation subunit is set, confirms subelement and obtains subelement; Wherein,
Subelement is set, is used to be provided with the rank of absorptivity, for each other absorptivity of level is provided with corresponding absorptivity numerical value;
Computation subunit, the signal strength signal intensity absorptivity numerical value when being used to calculate the tables and chairs reflection wireless signal of various materials, or calculate behind the various bodies of wall of wireless signal transmission said various bodies of wall to the absorptivity numerical value of signal strength signal intensity;
Confirm subelement, confirm the tables and chairs or the corresponding absorptivity rank of said various body of wall of said various materials by the absorptivity numerical value that is calculated;
Obtain subelement, be used for confirming corresponding absorptivity with concrete tables and chairs or body of wall.
Preferably, the absorptivity to signal strength signal intensity during tables and chairs reflection wireless signal is a, and wireless signal transmission body of wall back wall is to the absorptivity b of signal strength signal intensity; Said second definite unit confirms that the signal strength model of indoor somewhere wireless channel is: E * (1-a)
n* (1-b)
mWherein, E by said terminal equipment the signal strength signal intensity during the emission wireless signal; N is the tables and chairs order of reflection that the wireless signal of said terminal equipment arrives indoor certain place experience, is 0 without tables and chairs reflex time n; M is the number of times that the wireless signal of said terminal equipment arrives the transmission body of wall of indoor certain place experience, and m is not 0 during the transmission body of wall.
Preferably, said first confirm the unit further confirm wireless signal when glass reflect to the absorptivity c of signal strength signal intensity, what the wireless signal of confirming said terminal equipment emission arrived that indoor somewhere wireless signal experienced reflects number of times p through glass;
Said second confirms that the signal strength model of further definite indoor somewhere, unit wireless channel is specially: E * (1-a)
n* (1-b)
m* (1-c)
p, p is 0 when reflecting without glass.
Preferably, wireless signal is further confirmed through the absorptivity d of body of wall reflex time to signal strength signal intensity in said first definite unit, confirms that the wireless signal of said terminal equipment emission arrives the body of wall order of reflection q that indoor somewhere wireless signal is experienced;
Said second confirms that the signal strength model of further definite indoor somewhere, unit 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.
Among the present invention; Through obtaining the indoor absorptivity that article respectively are set the signal strength signal intensity of wireless signal; The wireless signal of further confirming the terminal equipment emission arrives indoor everywhere the time; Wireless signal experienced respectively is provided with item condition, can determine the signal strength model of indoor wireless channels accurately and quickly.The present invention has realized the simplification to modeling, and determined signal strength model is accurately practical.
Description of drawings
Fig. 1 places the wireless signal path sketch map in the room for CPE;
Fig. 2 places the wireless signal path sketch map outside the room for CPE;
Fig. 3 confirms the composition structural representation of device for indoor wireless channels model of the present invention.
Embodiment
Basic thought of the present invention does; Through obtaining the indoor absorptivity that article respectively are set the signal strength signal intensity of wireless signal, the wireless signal of further confirming the terminal equipment emission arrives indoor everywhere the time, and wireless signal experienced respectively is provided with item condition; For example wireless signal is through the reflection of tables and chairs or body of wall; Body of wall etc. is crossed in transmission, as long as the present invention determines the number of times through reflection or transmission, can determine the model of the signal strength signal intensity of indoor wireless signal everywhere.
For making the object of the invention, technical scheme and advantage clearer, below lift embodiment and with reference to accompanying drawing, to further explain of the present invention.
The present invention mainly sets up signal strength model to CPE, and CPE is applied to group users such as office building, enterprise, and its applied environment mainly is indoor.Specific to indoor, the facility in each room and the position of laying for goods are all different, and 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 indoor tables and chairs, glass, wall etc.What tables and chairs produced mainly is reflection, and glass produces reflection and refraction, and metope also mainly is reflection in this case.The propagation of wireless signal path of CPE emission has nothing in common with each other with the difference of the different putting position of these objects.If when the interior space was bigger, relatively spacious, the interference of radio signal propagation was less relatively, if the interior space is smaller, object arranges that than comparatively dense then the radio signal propagation interference is relatively large, difficult assessment.
Fig. 1 places the wireless signal path sketch map in the room for CPE; As shown in Figure 1; As in the small office, the CPE of medium-sized and small enterprises, city commercial center applications, placing under the indoor situation, most importantly the reflection that produces such as tables and chairs, body of wall and glass and refraction etc.
Indoor wireless channels model of the present invention is confirmed method; In the time of at first need obtaining tables and chairs reflections wireless signal to the absorptivity of signal strength signal intensity; Wireless signal transmission body of wall back wall is to the absorptivity of signal strength signal intensity, and wireless signal when glass reflects to the absorptivity of signal strength signal intensity.Here, can confirm above-mentioned absorptivity in the following manner.
The mean value of the signal strength signal intensity absorptivity during with the tables and chairs of various materials reflection wireless signal is as setting up the absorptivity that signal strength model is used; Here, can when reflecting wireless signal, measure its absorptivity to the tables and chairs of various materials to wireless signal; Perhaps, the tables and chairs that find out the various materials of having measured through relevant handbook when the reflection wireless signal to the absorptivity of signal strength signal intensity.It will be appreciated by those skilled in the art that through relevant analogue system or special-purpose measurement means determining various tables and chairs absorptivity to wireless signal when the reflection wireless signal is to realize easily.The present invention repeats no more and confirms the realization details of each material tables and chairs to the wireless signal absorptivity.
Perhaps, the rank of absorptivity is set, for each other absorptivity of level is provided with corresponding absorptivity numerical value; Signal strength signal intensity absorptivity numerical value when calculating the tables and chairs reflections wireless signal of various materials, and confirm the corresponding absorptivity rank of tables and chairs of said various materials by the absorptivity numerical value that is calculated.This mode is equivalent to set up by material the table of comparisons of tables and chairs absorptivity, soon the little material of wireless signal absorptivity difference is classified as one group, for the tables and chairs that are classified as a group, uses identical absorptivity numerical value.
For the reflection of body of wall, the mean value of the signal strength signal intensity absorptivity when reflecting wireless signal with various bodies of wall is as setting up the absorptivity that signal strength model is used; Perhaps, the rank of absorptivity is set, for each other absorptivity of level is provided with corresponding absorptivity numerical value; Signal strength signal intensity absorptivity numerical value when calculating various bodies of wall reflection wireless signal, and confirm the corresponding absorptivity rank of tables and chairs of said various materials by the absorptivity numerical value that is calculated.Generally speaking, various bodies of wall are basic identical to the reflection case of wireless signal, can be common during body of wall reflection wireless signal to the absorptivity of wireless signal as the absorptivity of various bodies of wall to wireless signal.
For glass,, can differentiation handle by the difference of glass material because various glass are lower to the absorptivity of wireless signal.Can be with simple glass to the absorptivity of wireless signal as the absorptivity of various material glass to wireless signal.
Suppose that the wireless signal strength that CPE launches is E, the absorptivity to wireless signal during tables and chairs reflections wireless signal is a, and is as shown in Figure 1, and the signal strength signal intensity of the wireless signal that near the user terminal the tables and chairs receives will be E * (1-a).Think that promptly the wireless signal that near the portable terminal of tables and chairs receives is the primary event of having passed through tables and chairs.Fig. 1 is the indoor channel model of simplifying most, and the dash area desk is a row.Complicated as needing in the path that wireless signal experienced when twice of tables and chairs reflection is above, during like reflection n time, the signal strength signal intensity of the interior wireless signal of respective chamber/chambers will be E * (1-a)
n
When above-mentioned wireless signal also needs through the body of wall reflection or needs transmission to cross glass; Can determine the model of indoor signal strength signal intensity everywhere as long as determine when body of wall reflex time body of wall is crossed glass to the absorptivity of the signal strength signal intensity of wireless signal and transmission glass easily to the absorptivity of wireless signal.
The assumed wireless signal when glass reflects to the absorptivity c of signal strength signal intensity, the wireless signal of confirming said CPE emission arrive that indoor somewhere wireless signal experienced through glass refraction number of times p; Confirm wireless signal through the absorptivity d of body of wall reflex time, confirm that the wireless signal of said CPE emission arrives the body of wall order of reflection q that indoor somewhere wireless signal is experienced signal strength signal intensity;
The signal strength model of said definite indoor wireless channel everywhere is specially: E * (1-a)
n* (1-c)
p* (1-d)
qWherein, be 0 without tables and chairs reflex time n, p is 0 when reflecting without glass, is 0 without body of wall reflex time q.
The present invention only need determine the article that wireless signal experienced in indoor somewhere and possible number of times and get final product; Wireless signal is through after the reflection or transmission object of certain article; Determine the absorptivity of respective objects to wireless signal; Through above-mentioned strength model, can determine the signal strength signal intensity at indoor any place then.
In the time of outside CPE places the room.The interference of wireless signal is mainly when the body of wall in this case, and the wireless signal refraction and the diffraction that meet with.The radio wave that sees through like this after the room that body of wall sends to the wall another side is much just weak.The facility of adding in the room is ever-changing.But on the whole, indoor radio interference directly places indoor situation the same with CPE, main reflection, refraction from indoor tables and chairs, body of wall, glass etc., diffraction and scattering etc.What tables and chairs produced mainly is reflection, and glass produces reflection and refraction, and metope also mainly is reflection in this case.The propagation of wireless signal path has nothing in common with each other owing to the putting position of these objects is different.
Fig. 2 places the wireless signal path sketch map outside the room for CPE; As shown in Figure 2; CPE places outside the room, therefore, and for indoor wireless signal; Mainly be CPE emission wireless signal at first transmission cross body of wall, definite mode of its signal strength model of back and above-mentioned indoor wireless signal strength model is identical in the inlet chamber.
Identical with the method for indoor wireless channels model under aforementioned definite Fig. 1 situation; This example also is at first to determine the absorptivity of indoor various material to wireless signal; Through determined each absorptivity; And the wireless signal of CPE emission 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.
Placing the situation outside the room for CPE, for the influence of wireless signal, mainly is that the absorption of body of wall back wall to wireless signal crossed in the wireless signal transmission.Therefore, need determine wireless signal transmission body of wall after, body of wall is to the absorptivity of wireless signal, confirms that specifically mode is following:
With said various bodies of wall behind the various bodies of wall of wireless signal transmission to the mean value of the absorptivity of signal strength signal intensity as setting up the absorptivity that signal strength model is used; Perhaps, the rank of absorptivity is set, for each other absorptivity of level is provided with corresponding absorptivity numerical value; Calculate behind the various bodies of wall of wireless signal transmission said various bodies of wall to the absorptivity numerical value of signal strength signal intensity, and confirm the corresponding absorptivity rank of said various body of wall by the absorptivity numerical value that is calculated.Here definite mode of body of wall absorptivity is confirmed that corresponding object is identical to the mode of the absorptivity of wireless signal with aforementioned to wireless signal reflection or refraction the time.Repeating no more, it realizes details.
Absorptivity to signal strength signal intensity when supposing tables and chairs reflection wireless signal is a, and wireless signal transmission body of wall back wall is to the absorptivity b of signal strength signal intensity; The signal strength model of then confirming indoor somewhere wireless channel is specially: E * (1-a)
n* (1-b)
mWherein, E by said CPE the signal strength signal intensity during the emission wireless signal; N is the tables and chairs order of reflection that the wireless signal of said CPE arrives indoor certain place experience, is 0 without tables and chairs reflex time n; M is the number of times that the wireless signal of said CPE arrives the transmission body of wall of indoor certain place experience, and m is not 0 during the transmission body of wall.
The assumed wireless signal when glass reflects to the absorptivity c of signal strength signal intensity, the wireless signal of confirming said CPE emission arrive that indoor somewhere wireless signal experienced through glass refraction number of times p; Confirm wireless signal through the absorptivity d of body of wall reflex time, confirm that the wireless signal of said CPE emission arrives the body of wall order of reflection q that indoor somewhere wireless signal is experienced signal strength signal intensity;
The signal strength model of said definite indoor wireless channel everywhere is specially: E * (1-a)
n* (1-b)
m* (1-c)
pWherein, be 0 without tables and chairs reflex time n, p is 0 when reflecting without glass.
The assumed wireless signal confirms that through the absorptivity d of body of wall reflex time to signal strength signal intensity the wireless signal of said CPE emission arrives the body of wall order of reflection q that indoor somewhere wireless signal is experienced; The signal strength model of then 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.
Among the present invention, also can determine the signal strength model of the indoor wireless channels of HNB with above-mentioned same mode.The present invention's its deterministic process that repeats no more.Terminal equipment among the present invention can be any terminal with signal emissivities, is not limited to CPE and HNB.
Fig. 3 is the composition structural representation that indoor wireless channels model of the present invention is confirmed device, and is as shown in Figure 3, and indoor wireless channels model of the present invention confirms that device comprises acquiring unit 30, first definite unit 31 and second definite unit 32; Wherein,
Acquiring unit 30, to the absorptivity of signal strength signal intensity, and/or wireless signal transmission body of wall back wall is to the absorptivity of signal strength signal intensity when being used to obtain tables and chairs reflection wireless signal;
First confirms unit 31, is used for confirming that the wireless signal of CPE emission arrives indoor everywhere tables and chairs order of reflection that wireless signal experienced and/or transmission body of wall number of times;
Second confirms unit 32, be used for first definite 31 definite order of reflection in unit and/or the transmission number of times, and corresponding absorptivity, the further signal strength model of definite indoor wireless channel everywhere.
Above-mentioned acquiring unit 30 further comprises computation subunit (not shown) and definite subelement (not shown); Wherein,
Computation subunit, the signal strength signal intensity absorptivity when being used to calculate the tables and chairs reflection wireless signal of various materials; Or calculate behind the various bodies of wall of wireless signal transmission said various bodies of wall to the absorptivity of signal strength signal intensity;
Confirm subelement, the mean value of the absorptivity of being calculated with said computation subunit is as setting up the absorptivity that signal strength model is used.
Above-mentioned acquiring unit 30 further comprises and subelement (not shown), computation subunit (not shown) is set, confirms subelement (not shown) and obtains subelement (not shown); Wherein,
Subelement is set, is used to be provided with the rank of absorptivity, for each other absorptivity of level is provided with corresponding absorptivity numerical value;
Computation subunit, the signal strength signal intensity absorptivity numerical value when being used to calculate the tables and chairs reflection wireless signal of various materials, or calculate behind the various bodies of wall of wireless signal transmission said various bodies of wall to the absorptivity numerical value of signal strength signal intensity;
Confirm subelement, confirm the tables and chairs or the corresponding absorptivity rank of said various body of wall of said various materials by the absorptivity numerical value that is calculated;
Obtain subelement, be used for confirming corresponding absorptivity with concrete tables and chairs or body of wall.
Absorptivity to signal strength signal intensity during tables and chairs reflection wireless signal is a, and wireless signal transmission body of wall back wall is to the absorptivity b of signal strength signal intensity; Second confirms that the signal strength model of unit 32 definite indoor somewhere wireless channels is: E * (1-a)
n* (1-b)
mWherein, E by said CPE the signal strength signal intensity during the emission wireless signal; N is the tables and chairs order of reflection that the wireless signal of said CPE arrives indoor certain place experience, is 0 without tables and chairs reflex time n; M is the number of times that the wireless signal of said CPE arrives the transmission body of wall of indoor certain place experience, and m is not 0 during the transmission body of wall.
First confirm unit 31 further confirm wireless signals when glass reflect to the absorptivity c of signal strength signal intensity, what the wireless signal of confirming said CPE emission arrived that indoor somewhere wireless signal experienced reflects number of times p through glass;
Second confirms that the signal strength model of unit 32 further definite indoor somewhere wireless channels is specially: E * (1-a)
n* (1-b)
m* (1-c)
p, p is 0 when reflecting without glass.
Wireless signals are further confirmed through the absorptivity d of body of wall reflex time to signal strength signal intensity in first definite unit 31, confirm that the wireless signal of said CPE emission arrives the body of wall order of reflection q that indoor somewhere wireless signal is experienced;
Second confirms that the signal strength model of unit 32 further definite indoor somewhere wireless channels is specially: 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; The present invention's indoor wireless channels model shown in Figure 3 confirms that device confirms method design for realizing aforesaid indoor wireless channels model, and the realization function of above-mentioned each processing unit can be with reference to the associated description of preceding method and understood.The function of each processing unit among the figure can realize through the program that runs on the processor, also can realize through concrete logical circuit.
The above is merely preferred embodiment of the present invention, is not to be used to limit protection scope of the present invention.
Claims (12)
1. an indoor wireless channels model is confirmed method, it is characterized in that, when obtaining tables and chairs reflections wireless signal to the absorptivity of signal strength signal intensity, and/or, obtain the absorptivity of wireless signal transmission body of wall back wall to signal strength signal intensity; Said method also comprises:
The wireless signal of confirming the terminal equipment emission arrives indoor everywhere tables and chairs order of reflection that wireless signal experienced and/or transmission body of wall number of times; With definite order of reflection of institute and/or transmission number of times; And corresponding absorptivity, the further signal strength model of definite indoor wireless channel everywhere.
2. method according to claim 1 is characterized in that, said when obtaining tables and chairs reflections wireless signal the absorptivity to signal strength signal intensity be specially:
The mean value of the signal strength signal intensity absorptivity during with the tables and chairs of various materials reflection wireless signal is as setting up the absorptivity that signal strength model is used;
Perhaps, the rank of absorptivity is set, for each other absorptivity of level is provided with corresponding absorptivity numerical value; Signal strength signal intensity absorptivity numerical value when calculating the tables and chairs reflections wireless signal of various materials, and confirm the corresponding absorptivity rank of tables and chairs of said various materials by the absorptivity numerical value that is calculated.
3. method according to claim 1 is characterized in that, the said wireless signal transmission body of wall back wall that obtains is specially the absorptivity of wireless signal:
With said various bodies of wall behind the various bodies of wall of wireless signal transmission to the mean value of the absorptivity of signal strength signal intensity as setting up the absorptivity that signal strength model is used;
Perhaps, the rank of absorptivity is set, for each other absorptivity of level is provided with corresponding absorptivity numerical value; Calculate behind the various bodies of wall of wireless signal transmission said various bodies of wall to the absorptivity numerical value of signal strength signal intensity, and confirm the corresponding absorptivity rank of said various body of wall by the absorptivity numerical value that is calculated.
4. according to claim 2 or 3 described methods, it is characterized in that the absorptivity to signal strength signal intensity during tables and chairs reflection wireless signal is a, wireless signal transmission body of wall back wall is to the absorptivity b of signal strength signal intensity; The signal strength model of said definite indoor somewhere wireless channel is specially: E * (1-a)
n* (1-b)
mWherein, E by said terminal equipment the signal strength signal intensity during the emission wireless signal; N is the tables and chairs order of reflection that the wireless signal of said terminal equipment arrives indoor certain place experience, is 0 without tables and chairs reflex time n; M is the number of times that the wireless signal of said terminal equipment arrives the transmission body of wall of indoor certain place experience, and m is not 0 during the transmission body of wall.
5. method according to claim 4 is characterized in that, said method also comprises:
Further confirm wireless signal when glass reflect to the absorptivity c of signal strength signal intensity, what the wireless signal of confirming said terminal equipment emission arrived that indoor somewhere wireless signal experienced reflects number of times p through glass;
The signal strength model of said definite indoor somewhere wireless channel is specially: E * (1-a)
n* (1-b)
m* (1-c)
p, p is 0 when reflecting without glass.
6. method according to claim 5 is characterized in that, said method also comprises:
Further confirm wireless signal through the absorptivity d of body of wall reflex time, confirm that the wireless signal of said terminal equipment emission arrives the body of wall order of reflection q that indoor somewhere wireless signal is experienced signal strength signal intensity;
The signal strength model of said definite 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.
7. an indoor wireless channels model is confirmed device, it is characterized in that, said device comprises acquiring unit, first definite unit and second definite unit; Wherein,
Acquiring unit, to the absorptivity of signal strength signal intensity, and/or wireless signal transmission body of wall back wall is to the absorptivity of signal strength signal intensity when being used to obtain tables and chairs reflection wireless signal;
First confirms the unit, is used for confirming that the wireless signal of terminal equipment emission arrives indoor everywhere tables and chairs order of reflection that wireless signal experienced and/or transmission body of wall number of times;
Second confirms the unit, be used for said first definite unit definite order of reflection of institute and/or the transmission number of times, and corresponding absorptivity, the further signal strength model of definite indoor wireless channel everywhere.
8. device according to claim 7 is characterized in that, said acquiring unit further comprises computation subunit and definite subelement; Wherein,
Computation subunit, the signal strength signal intensity absorptivity when being used to calculate the tables and chairs reflection wireless signal of various materials; Or calculate behind the various bodies of wall of wireless signal transmission said various bodies of wall to the absorptivity of signal strength signal intensity;
Confirm subelement, the mean value of the absorptivity of being calculated with said computation subunit is as setting up the absorptivity that signal strength model is used.
9. device according to claim 8 is characterized in that, said acquiring unit further comprises and subelement, computation subunit is set, confirms subelement and obtains subelement; Wherein,
Subelement is set, is used to be provided with the rank of absorptivity, for each other absorptivity of level is provided with corresponding absorptivity numerical value;
Computation subunit, the signal strength signal intensity absorptivity numerical value when being used to calculate the tables and chairs reflection wireless signal of various materials, or calculate behind the various bodies of wall of wireless signal transmission said various bodies of wall to the absorptivity numerical value of signal strength signal intensity;
Confirm subelement, confirm the tables and chairs or the corresponding absorptivity rank of said various body of wall of said various materials by the absorptivity numerical value that is calculated;
Obtain subelement, be used for confirming corresponding absorptivity with concrete tables and chairs or body of wall.
10. according to Claim 8 or 9 described devices, it is characterized in that the absorptivity to signal strength signal intensity during tables and chairs reflection wireless signal is a, wireless signal transmission body of wall back wall is to the absorptivity b of signal strength signal intensity; Said second definite unit confirms that the signal strength model of indoor somewhere wireless channel is: E * (1-a)
n* (1-b)
mWherein, E by said terminal equipment the signal strength signal intensity during the emission wireless signal; N is the tables and chairs order of reflection that the wireless signal of said terminal equipment arrives indoor certain place experience, is 0 without tables and chairs reflex time n; M is the number of times that the wireless signal of said terminal equipment arrives the transmission body of wall of indoor certain place experience, and m is not 0 during the transmission body of wall.
11. device according to claim 10; It is characterized in that; Said first confirm the unit further confirm wireless signal when glass reflect to the absorptivity c of signal strength signal intensity, what the wireless signal of confirming said terminal equipment emission arrived that indoor somewhere wireless signal experienced reflects number of times p through glass;
Said second confirms that the signal strength model of further definite indoor somewhere, unit wireless channel is specially: E * (1-a)
n* (1-b)
m* (1-c)
p, p is 0 when reflecting without glass.
12. device according to claim 11; It is characterized in that; Wireless signal is further confirmed through the absorptivity d of body of wall reflex time to signal strength signal intensity in said first definite unit, confirms that the wireless signal of said terminal equipment emission arrives the body of wall order of reflection q that indoor somewhere wireless signal is experienced;
Said second confirms that the signal strength model of further definite indoor somewhere, unit 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.
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