CN105356929A - Capacity improvement method for high-altitude communication platform system - Google Patents

Capacity improvement method for high-altitude communication platform system Download PDF

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CN105356929A
CN105356929A CN201510694767.3A CN201510694767A CN105356929A CN 105356929 A CN105356929 A CN 105356929A CN 201510694767 A CN201510694767 A CN 201510694767A CN 105356929 A CN105356929 A CN 105356929A
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haps
cell
capacity
interference
cdma
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王杭先
张邦宁
郭道省
史煜
李超
叶展
赵兵
潘小飞
方华
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PLA University of Science and Technology
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PLA University of Science and Technology
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/185—Space-based or airborne stations; Stations for satellite systems
    • H04B7/18502—Airborne stations
    • H04B7/18504—Aircraft used as relay or high altitude atmospheric platform
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/18—Network planning tools

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  • Computer Networks & Wireless Communication (AREA)
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Abstract

The invention discloses a capacity improvement method for a high-altitude communication platform system. An HAPS system, namely an HAPS-CDMA system interference model, in a CDMA access manner is established at first; calculation formulae of a system interference factor and a single cellular capacity are derivate; then, the fact that the capacity of the HAPS-CDMA system is higher than that of a ground CDMA system is verified; finally, an HAPS and ground CDMA double-layer honeycomb overlapping coverage system is provided; and namely, the ground CDMA system is embedded in the original HAPS-CDMA system. By means of the method, the purposes of effectively reducing interference and improving the capacity of the system are achieved; a simulation result shows that the system capacity, which is higher than that of two kinds of single systems including the HAPS-CDMA system and the ground CDMA system, can be obtained through the method provided by the invention; and furthermore, the problems of great communication requirements in a hotspot area having relatively high population density can be solved.

Description

A kind of capacity boost method of high altitude communication plateform system
Technical field
The invention belongs to high altitude communication field, be specifically related to a kind of capacity boost method of high altitude communication plateform system.
Background technology
In recent years, the high speed development of radiotechnics brings a subversiveness to human society high-tech sector and changes, the fast development of land honeycomb mobile communication and satellite communication, have impact on the life style of people more and more, but along with people are to the quick growth of broadband multimedia services and various mobile communication demand, build have larger power system capacity, the higher availability of frequency spectrum, faster cloth net spee, more easily keep in repair updating ability, cheaper construction cost system extremely urgent.Just at developing High Altitude Platform (HighAltitudePlatformStations, HAPS) communication system, combine the technological merit of two great tradition communication systems, be generally considered the another important breakthrough of wireless communication field after satellite communication, cellular communication, it can realize high density by less resource and large regions covers, there is the features such as expense is low, capacity large, it is fast to dispose, arrange net flexibly, recovery is convenient, cause global extensive concern.
Emerging HAPS system is by the reason extensively had an optimistic view of, and one of them important reason is exactly its high power system capacity, and this is also one of key index of a research program communication system, therefore holds quantitative analysis to HAPS system communication and research is very valuable.There are many scholar's research at present about the scheme improving HAPS system communication capacity, HAPS communication system both can networking separately, with ground relevant device and various user terminal communication, also can with the communication network mixed networking such as existing ground-based cellular systems, satellite communication system.Jeng-JiHuang, Zong-JheWu, Wei-TingWang. " DesignsofMicrocellforanIntegratedHAPS-terrestrialCDMASys tem " (IEEE19thInternationalSymposiumonPersonal, IndoorandRadioCommunications.2008:1-5) in a literary composition, devise two kinds of High Altitude Platforms and terrestrial cellular structure to promote HAPS and ground cdma system uplink capacity, but there is no the interference between discussion two systems in the method, HAPS and ground cdma system actual interference be greater than determine in article system interference.NKSrivastava, A.K.Chaturvedi. " FlexibleandDynamicPowerAllocationinBroadbandMul-ti-beamS atellites " (IEEECommunicationsLeters, 2013,17 (9): 1722-1725) a kind of method proposing HAPS of minimizing in a literary composition and disturb between ground CDMA group network system inter-system interference and respective cellular cell is to promote the method for heterogeneous network capacity, but do not consider the actual distribution of interference in community in the method, be not inconsistent with actual conditions.
Summary of the invention
The object of the present invention is to provide a kind of capacity boost method of high altitude communication plateform system, consider the interference between two systems and the actual distribution of interference in community, solve the problem that hot zones communication requirement amount is large.
The technical solution realizing the object of the invention is: a kind of capacity boost method of high altitude communication plateform system, and method step is as follows:
Step 1, the antenna building HAPS communication system and path loss model.
Step 2, HAPS communication system adopt CDMA access way, suppose that terrestrial user is evenly distributed, High Altitude Platform position is in stratosphere and keeps geo-stationary over the ground, Modling model under desirable power control conditions, High Altitude Platform utilizes phased array antenna to cast the circular honeycomb of several area equation on ground, constitutes a layer beehive area structure, and analyzes the up-link capacity of HAPS-CDMA system, determine its capacity, i.e. community user number.
Step 3, suppose terrestrial user by the outside Gaussian distributed in center cell in High Altitude Platform coverage, build HAPS and the overlapping covering system of ground cdma cellular, platform service region is as follows by the user density distribution function ρ that center is outside:
Wherein r ' expression with reference to user location to High Altitude Platform perpendicular to ground intersection point between distance; σ represents the standard deviation of Gaussian Profile; C is for presetting constant coefficient.
Step 4, determine HAPS and ground cdma communication system double layer cell power system capacity:
4-1) at terrestrial user be Gaussian Profile condition under, analyze single HAPS-CDMA system centre cell capacity, to obtain in center cell interference and non-central community to the interference of center cell, its result is updated to the single HAPS-CDMA system centre cell capacity obtained by step 2, obtains single HAPS-CDMA system centre cell capacity.
4-2) user's interference of hot zones is analyzed, redefine intra-cell interference and presence of intercell interference, by result, in generation, gets back to single HAPS-CDMA system centre cell capacity and each layer single subdistrict calculation of capacity formula again, namely obtains the HAPS under user's Gaussian Profile and ground CDMA double layer cell power system capacity.
In described step 1, HAPS communication system adopts multi-beam phased array antennas model, and its gain expressions is as follows:
Wherein G hrepresent antenna gain, unit is dB, θ is the angle that antenna departs from main beam center;
Meanwhile, the average path loss model on HAPS communication system and ground is as follows:
L H(l)＝32.4+20lg(l)+20lg(fc)
L T(l)＝73.5+10lg(γ/R 0) μ(3)
Wherein L hrepresent the link load of HAPS, L trepresent the link load of ground cdma system; L is the distance that user arrives High Altitude Platform, and γ is the distance between user to ground base station; Fc is carrier frequency, and μ is terrestrial path fissipation factor, R 0for base station expect without any active ues zone radius.
In described step 2, the up-link capacity of HAPS-CDMA system is analyzed, determines that the method for its capacity is as follows:
Step 2-1, according to described layer beehive area structure, determine the antenna received power S of HAPS system:
P is transmitted power needed for user.
Step 2-2, determine the intra-cell interference I that center cell user is subject to sc:
Wherein A is overlay area, single cellular cell area, and R is single cellular cell radius, and M is user capacity, center of housing estate point O and the center of housing estate point O being positioned at jth layer centered by d jline distance, α is voice activity factor.
Step 2-3, determine the interference I of all users in community to center cell j:
Wherein for corresponding antenna gain, for corresponding antenna gain, wherein A jrepresent the cellular cell area being positioned at jth layer.
Step 2-4, the interference sum determining except center cell, i.e. presence of intercell interference I oc:
Step 2-5, definition presence of intercell interference are interference factor f with the ratio of intra-cell interference and calculate:
Wherein r is for user i is to its Serving cell O jthe distance at center, center of housing estate point O and the center of housing estate point O being positioned at jth layer centered by θ jangle between line and user; N is total number of plies of layer cellular cell.
Step 2-6, the Signal Interference and Noise Ratio determining due to base station received signal, i.e. SINR:
Wherein ω is bandwidth, σ n 2for thermal noise power, R bfor the rate of information throughput; E bfor signal energy per bit, T 0for interference power density.
Step 2-7, by T sc, I oc, f substitutes in formula (9), obtains center cell number of users M:
Described step 4-1) in, obtain single HAPS-CDMA system centre cell capacity, algorithm is as follows:
Step 4-1-1, determine the intra-cell interference I that center cell user is subject to sc', other area interference I ' ocand interference factor f ':
Step 4-1-2, the Signal Interference and Noise Ratio determining due to base station received signal, i.e. SINR ':
Step 4-1-3, convolution (11), formula (12), formula (13), formula (14), obtain I sc' and single HAPS-CDMA system in preset constant C:
Step 4-1-4, C to be updated in formula (1), to obtain single HAPS-CDMA system centre cell capacity M 1and capacity M in single subdistrict in each layer n:
Wherein,
Described step 4-2) in, obtain the HAPS under user's Gaussian Profile and ground CDMA double layer cell power system capacity, algorithm is as follows:
Step 4-2-1, the user of hot zones interference to be analyzed, redefine intra-cell interference I sc" and presence of intercell interference I " oc, suppose f scfor intra-cell interference changed factor, f ocfor presence of intercell interference changed factor, HAPS and CDMA double layer cell system lap region, ground are A ', and center cell remainder is
Step 4-2-2, the Signal Interference and Noise Ratio determining due to base station received signal, i.e. SINR ":
In step 4-2-3, convolution (1), formula (19), formula (20) and formula (21), acquired results obtains the preset constant C' in HAPS and ground CDMA double layer cell system:
Again C ' is updated in the formula (10) of the single HAPS-CDMA power system capacity obtained and goes, obtain HAPS and ground CDMA double layer cell power system capacity under user's Gaussian Profile.
The present invention compared with prior art, its remarkable advantage is: (1) is in HAPS and ground CDMA double layer cell communication system, suppose terrestrial user in High Altitude Platform coverage by the outside Gaussian distributed in center cell, more tally with the actual situation; (2) on the basis of HAPS-CDMA system, introduce ground cdma system, achieve double layer cell and cover and take into full account the mutual interference between Liao Liangge community, efficiently solve the high capacity communication problem of hot zones in real life; (3) capacity of communication system is improved.
Accompanying drawing explanation
Fig. 1 is the N layer beehive area structure schematic diagram of the capacity boost method of a kind of high altitude communication plateform system of the present invention.
Fig. 2 is the HAPS-CDMA system interference model schematic of the capacity boost method of a kind of high altitude communication plateform system of the present invention.
Fig. 3 is HAPS and the ground cdma cellular overlay model schematic diagram of the capacity boost method of a kind of high altitude communication plateform system of the present invention.
Fig. 4 is the analogous diagram of intra-cell interference changed factor with ground cell size change of the capacity boost method of a kind of high altitude communication plateform system of the present invention.
Fig. 5 is the analogous diagram of center cell capacity with ground cell size change of the capacity boost method of a kind of high altitude communication plateform system of the present invention.
Fig. 6 is terrestrial cellular covering radius and the capacity relationship analogous diagram of the capacity boost method of a kind of high altitude communication plateform system of the present invention.
Fig. 7 is the overall flow schematic diagram of the capacity boost method of a kind of high altitude communication plateform system of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail.
Composition graphs 1, Fig. 2, Fig. 3, Fig. 4 and Fig. 7, a kind of capacity boost system, method of high altitude communication plateform system, method step is as follows:
Step 1, structure HAPS system antenna and path loss model;
Antenna model: HAPS communication system adopts multi-beam phased array antenna, and the Array Signal Processing equipment of phased array antenna can provide larger signal to noise ratio (SNR) to mobile terminal, and energy Extension of service scope, be very applicable to HAPS communication system.Phased array antenna is positioned on High Altitude Platform, and its gain can be represented by formula (2), and unit is dB, wherein G hrepresent antenna gain, θ is the angle that antenna departs from main beam center.
Path loss model: the average path loss of HAPS communication system and ground cdma system can be expressed as formula (3) form, in units of dB, wherein L hrepresent the link load of HAPS, L trepresent the link load of ground cdma system; L is the distance that user arrives High Altitude Platform, and γ is the distance between user to ground base station; Fc is carrier frequency, and μ is terrestrial path fissipation factor, R 0for base station expect without any active ues zone radius.
L H(l)＝32.4+20lg(l)+20lg(fc)
L T(l)＝73.5+10lg(γ/R 0) μ(3)
Step 2, HAPS communication system adopt CDMA access way, to obtain the plurality of advantages such as higher power system capacity, stronger security performance and better hand-off capability.CDMA is self-interference system, disturb other user from this community and adjacent cell, suppose that terrestrial user is evenly distributed, position of platform is in and is the stratosphere of (20km) apart from ground height and keeps geo-stationary over the ground, Modling model under desirable power control conditions, as shown in Figure 1.Platform utilizes phased array antenna to cast the circular honeycomb of a large amount of area equation on ground, constitutes a layer beehive area structure, as shown in Figure 2.
Step 2-1, according to described layer beehive area structure, determine the antenna received power S of HAPS system:
If community centered by coverage cell immediately below platform, ZejCeng community number is formula (23).
N j＝6·(j-1)(j＝1，2…，N)(23)
Because antenna is positioned at bottom High Altitude Platform, and size opposed platforms height is negligible, so can suppose that the platform base station corresponding to each cellular cell, ground is positioned at same position.In Fig. 2, represent the angle of user i and center cell central optical axis, represent the angle of user i and its Serving cell central optical axis; l ij, 0represent the path of user i to platform base station, l ijrepresent that user i is to its center, Serving cell to the path of platform base station.If overlay area, user single cellular cell is designated as A ', radius is R, and user capacity is M, and user i is to its Serving cell O jthe distance at center is r, community O, O jline of centres distance is d, and the angle between line and user is θ; α is voice activity factor, and P is transmitted power needed for user, then HAPS system antenna received power S can be expressed as
Step 2-2, determine the intra-cell interference I that center cell user is subject to sc:
Wherein A is overlay area, single cellular cell area, and R is single cellular cell radius, and M is user capacity, center of housing estate point O and the center of housing estate point O being positioned at jth layer centered by d jline distance, α is voice activity factor;
Step 2-3, determine the interference I of all users in community to center cell j:
Wherein for corresponding antenna gain, for corresponding antenna gain, wherein A jrepresent the cellular cell area being positioned at jth layer;
Step 2-4, the interference sum determining except center cell, i.e. presence of intercell interference I oc:
Step 2-5, definition presence of intercell interference are interference factor f with the ratio of intra-cell interference and calculate:
Wherein r is for user i is to its Serving cell O jthe distance at center, center of housing estate point O and the center of housing estate point O being positioned at jth layer centered by θ jangle between line and user; N is total number of plies of layer cellular cell;
Step 2-6, the Signal Interference and Noise Ratio determining due to base station received signal, i.e. SINR:
Wherein ω is bandwidth, σ n 2for thermal noise power, R bfor the rate of information throughput; E bfor signal energy per bit, I 0for interference power density;
Step 2-7, by I sc, I oc, f substitutes in formula (9), obtains center cell number of users M:
Step 3, in order to the large problem of the hot zones capacity requirement that adapts to cause because population is unbalance in social development process, propose a kind of scheme of overlapping covering cdma cellular community, single ground on original HAPS-CDMA system coverage, CDMA community, ground and original HAPS-CDMA system cell size can be adjusted to obtain Optimal coverage scheme, make power system capacity reach optimum.This algorithm model can simply describe as Fig. 3.
Be located on Platform center community and set up a cdma base station introducing terrestrial cellular community, and CDMA community, ground overlaps with center of housing estate; HAPS and ground cdma system co-operation are in millimere-wave band, for terrestrial user provides fixing and mobile service, when user terminal utilization orientation antenna access HAPS system, the inter-system interference of HAPS and ground CDMA group network system even can be ignored very little.HAPS-CDMA system cell radius is R, superpose ground CDMA radius of society and be designated as R t; And note lap region is A ', center cell remainder is if G tfor ground-plane antenna gain, get 0dB value.
For further closing to reality, suppose terrestrial user by the outside Gaussian distributed in center cell in High Altitude Platform coverage, namely
Wherein ρ is platform service region by the outside user density distribution function in center; R ' expression with reference to user location to platform perpendicular to ground intersection point between distance; σ represents the standard deviation of Gaussian Profile; C is a default constant coefficient.
Step 4, determine HAPS and ground cdma communication system double layer cell power system capacity:
4-1) at terrestrial user be Gaussian Profile condition under, analyze single HAPS-CDMA system centre cell capacity, to obtain in center cell interference and non-central community to the interference of center cell, its result is updated to the single HAPS-CDMA system centre cell capacity obtained by step 2, obtains single HAPS-CDMA system centre cell capacity;
Step 4-1) in, obtain single HAPS-CDMA system centre cell capacity, algorithm is as follows:
Step 4-1-1, determine the intra-cell interference I that center cell user is subject to sc', other area interference I ' ocand interference factor f ':
Step 4-1-2, the Signal Interference and Noise Ratio determining due to base station received signal, i.e. SINR ':
Step 4-1-3, convolution (11), formula (12), formula (13), formula (14), obtain I sc' and single HAPS-CDMA system in preset constant C:
Step 4-1-4, C to be updated in formula (1), to obtain single HAPS-CDMA system centre cell capacity M 1and capacity M in single subdistrict in each layer n:
Wherein,
4-2) user's interference of hot zones is analyzed, redefine intra-cell interference and presence of intercell interference, by result, in generation, gets back to single HAPS-CDMA system centre cell capacity and each layer single subdistrict calculation of capacity formula again, namely obtains the HAPS under user's Gaussian Profile and ground CDMA double layer cell power system capacity.
Step 4-2-1, user's interference of dash area in Fig. 3 and hot zones to be analyzed, redefine intra-cell interference I sc" and presence of intercell interference I " oc, suppose f scfor intra-cell interference changed factor, f ocfor presence of intercell interference changed factor, HAPS and CDMA double layer cell system lap region, ground are A ', and center cell remainder is
Step 4-2-2, the Signal Interference and Noise Ratio determining due to base station received signal, i.e. SINR ":
In step 4-2-3, convolution (1), formula (19), formula (20) and formula (21), acquired results obtains the preset constant C' in HAPS and ground CDMA double layer cell system:
Again C ' is updated in the formula (10) of the single HAPS-CDMA power system capacity obtained and goes, obtain HAPS and ground CDMA double layer cell power system capacity under user's Gaussian Profile.
The implementation process of step 1-step 4 is provided by the flow chart of Fig. 7.
Embodiment 1
Step 1, structure HAPS system antenna and path loss model;
Step 2, HAPS communication system adopt CDMA access way, suppose that terrestrial user is evenly distributed, High Altitude Platform position is in stratosphere and keeps geo-stationary over the ground, Modling model under desirable power control conditions, High Altitude Platform utilizes phased array antenna to cast the circular honeycomb of several area equation on ground, constitutes a layer beehive area structure, and analyzes the up-link capacity of HAPS-CDMA system, determine its capacity, i.e. community user number:
Step 2-1, according to described layer beehive area structure, determine the antenna received power S of HAPS system:
Step 2-2, determine the intra-cell interference I that center cell user is subject to sc:
Step 2-3, determine the interference I of all users in community to center cell j:
Step 2-4, the interference sum determining except center cell, i.e. presence of intercell interference I oc:
Step 2-5, definition presence of intercell interference are interference factor f with the ratio of intra-cell interference and calculate:
Step 2-6, the Signal Interference and Noise Ratio determining due to base station received signal, i.e. SINR:
Step 2-7, by I sc, I oc, f substitutes in formula (9), obtains center cell number of users M:
Step 3, suppose terrestrial user by the outside Gaussian distributed in center cell in High Altitude Platform coverage, build HAPS and the overlapping covering system of ground cdma cellular, platform service region is as follows by the user density distribution function ρ that center is outside:
Step 4, determine HAPS and ground cdma communication system double layer cell power system capacity:
Step 4-1), obtain single HAPS-CDMA system centre cell capacity, algorithm is as follows:
Step 4-1-1, determine the intra-cell interference I that center cell user is subject to sc', other area interference I ' ocand interference factor f ':
Step 4-1-2, the Signal Interference and Noise Ratio determining due to base station received signal, i.e. SINR ':
Step 4-1-3, convolution (11), formula (12), formula (13), formula (14), obtain I sc' and single HAPS-CDMA system in preset constant C:
Step 4-1-4, C to be updated in formula (1), to obtain single HAPS-CDMA system centre cell capacity M 1and capacity M in single subdistrict in each layer n:
Wherein,
4-2) user's interference of hot zones is analyzed, redefine intra-cell interference and presence of intercell interference, by result, in generation, gets back to single HAPS-CDMA system centre cell capacity and each layer single subdistrict calculation of capacity formula again, namely obtains the HAPS under user's Gaussian Profile and ground CDMA double layer cell power system capacity.
Step 4-2-1, the user of hot zones interference to be analyzed, redefine intra-cell interference I sc" and presence of intercell interference I " oc, suppose f scfor intra-cell interference changed factor, f ocfor presence of intercell interference changed factor, HAPS and CDMA double layer cell system lap region, ground are A ', and center cell remainder is
Step 4-2-2, the Signal Interference and Noise Ratio determining due to base station received signal, i.e. SINR ":
In step 4-2-3, convolution (1), formula (19), formula (20) and formula (21), acquired results obtains the preset constant C' in HAPS and ground CDMA double layer cell system:
Again C ' is updated in the formula (10) of the single HAPS-CDMA power system capacity obtained and goes, obtain HAPS and ground CDMA double layer cell power system capacity under user's Gaussian Profile.
User's interference of dash area in Fig. 3 and hot zones is analyzed, recalculates intra-cell interference and presence of intercell interference, define and be respectively intra-cell interference changed factor and presence of intercell interference changed factor, can obtain
Due to the Signal Interference and Noise Ratio of base station received signal, i.e. SINR " be
Convolution (1), formula (19), formula (20) and formula (21) can obtain the preset constant C ' in HAPS and ground CDMA double layer cell system
R ' value cotype (18), then formula (22) is substituted into formula (10) HAPS and ground CDMA double layer cell power system capacity under user's Gaussian Profile can be obtained.
According to step 1-step 4, according to the relevant criterion of cdma system shown in table 1 setting simulation parameter, whole flow process is emulated, obtains the analogous diagram of Fig. 4, Fig. 5, Fig. 6.
Table 1HAPS-CDMA power system capacity analyzes simulation parameter
From step 2 and step 3, under the overlapping covering scheme of HAPS and ground CDMA, presence of intercell interference is constant, but intra-cell interference creates change, simulation result as shown in Figure 4,5, as ground cell radius R twhen increasing to HAPS radius of society size 1km gradually by 0, intra-cell interference changed factor f scremarkable decline, especially from 0 to 0.4km process, decrease speed quickly, and at R treach minimum value during=0.4km, also than single cellular system, there is more minor interference though have afterwards slowly to rise, namely work as R tduring=0.4km, overlapping system can obtain minimum intra-cell interference, maximum capacity improving amount.
In order to better analyze the effect of this section algorithm on raising capacity, time simulate each layer single subdistrict capacity, and compare can obtain Fig. 6 with HAPS-CDMA system and ground cdma system two kinds of single system capacity, this algorithm can obtain higher power system capacity as seen from the figure, especially center cell capacity improves about 9%, so simulation result shows that this algorithm can reach the object reducing interference, improve cell capacity especially hot zones capacity.
The invention has the advantages that in HAPS and ground CDMA double layer cell communication system, suppose terrestrial user in High Altitude Platform coverage by the outside Gaussian distributed in center cell, more tally with the actual situation; The basis of HAPS-CDMA system is introduced ground cdma system, achieves double layer cell and cover and take into full account the mutual interference between Liao Liangge community, efficiently solve the high capacity communication problem of hot zones in real life; Improve capacity of communication system.

Claims (5)

1. a capacity boost method for high altitude communication plateform system, it is characterized in that, method step is as follows:
Step 1, the antenna building HAPS communication system and path loss model;
Step 2, HAPS communication system adopt CDMA access way, suppose that terrestrial user is evenly distributed, High Altitude Platform position is in stratosphere and keeps geo-stationary over the ground, Modling model under desirable power control conditions, High Altitude Platform utilizes phased array antenna to cast the circular honeycomb of several area equation on ground, constitutes a layer beehive area structure, and analyzes the up-link capacity of HAPS-CDMA system, determine its capacity, i.e. community user number;
Step 3, suppose terrestrial user by the outside Gaussian distributed in center cell in High Altitude Platform coverage, build HAPS and the overlapping covering system of ground cdma cellular, platform service region is as follows by the user density distribution function ρ that center is outside:
Wherein r ' expression with reference to user location to High Altitude Platform perpendicular to ground intersection point between distance; σ represents the standard deviation of Gaussian Profile; C is for presetting constant coefficient;
Step 4, determine HAPS and ground cdma communication system double layer cell power system capacity:
4-1) at terrestrial user be Gaussian Profile condition under, analyze single HAPS-CDMA system centre cell capacity, to obtain in center cell interference and non-central community to the interference of center cell, its result is updated to the single HAPS-CDMA system centre cell capacity obtained by step 2, obtains single HAPS-CDMA system centre cell capacity;
4-2) user's interference of hot zones is analyzed, redefine intra-cell interference and presence of intercell interference, by result, in generation, gets back to single HAPS-CDMA system centre cell capacity and each layer single subdistrict calculation of capacity formula again, namely obtains the HAPS under user's Gaussian Profile and ground CDMA double layer cell power system capacity.
2. the capacity boost method of high altitude communication plateform system according to claim 1, is characterized in that, in described step 1, HAPS communication system adopts multi-beam phased array antennas model, and its gain expressions is as follows:
Wherein G hrepresent antenna gain, unit is dB, θ is the angle that antenna departs from main beam center;
Meanwhile, the average path loss model on HAPS communication system and ground is as follows:
L H(l)＝32.4+20lg(l)+20lg(fc)
L T(l)＝73.5+10lg(γ/R 0) μ(3)
Wherein L hrepresent the link load of HAPS, L trepresent the link load of ground cdma system; L is the distance that user arrives High Altitude Platform, and γ is the distance between user to ground base station; Fc is carrier frequency, and μ is terrestrial path fissipation factor, R 0for base station expect without any active ues zone radius.
3. the capacity boost method of high altitude communication plateform system according to claim 1, is characterized in that, in described step 2, analyzes the up-link capacity of HAPS-CDMA system, determines that the method for its capacity is as follows:
Step 2-1, according to described layer beehive area structure, determine the antenna received power S of HAPS system:
P is transmitted power needed for user;
Step 2-2, determine the intra-cell interference I that center cell user is subject to sc:
Wherein A is overlay area, single cellular cell area, and R is single cellular cell radius, and M is user capacity, center of housing estate point O and the center of housing estate point O being positioned at jth layer centered by d jline distance, α is voice activity factor;
Step 2-3, determine the interference I of all users in community to center cell j:
Wherein for corresponding antenna gain, for corresponding antenna gain, wherein A jrepresent the cellular cell area being positioned at jth layer;
Step 2-4, the interference sum determining except center cell, i.e. presence of intercell interference I oc:
Step 2-5, definition presence of intercell interference are interference factor f with the ratio of intra-cell interference and calculate:
Wherein r is for user i is to its Serving cell O jthe distance at center, center of housing estate point O and the center of housing estate point O being positioned at jth layer centered by θ jangle between line and user; N is total number of plies of layer cellular cell;
Step 2-6, the Signal Interference and Noise Ratio determining due to base station received signal, i.e. SINR:
Wherein ω is bandwidth, σ n 2for thermal noise power, R bfor the rate of information throughput; E bfor signal energy per bit, I 0for interference power density;
Step 2-7, by I sc, I oc, f substitutes in formula (9), obtains center cell number of users M:
4. the capacity boost method of high altitude communication plateform system according to claim 1, is characterized in that, described step 4-1) in, obtain single HAPS-CDMA system centre cell capacity, algorithm is as follows:
Step 4-1-1, determine the intra-cell interference I that center cell user is subject to sc', other area interference I ' ocand interference factor f ':
Step 4-1-2, the Signal Interference and Noise Ratio determining due to base station received signal, i.e. SINR':
Step 4-1-3, convolution (11), formula (12), formula (13), formula (14), obtain I sc' and single HAPS-CDMA system in preset constant C:
Step 4-1-4, C to be updated in formula (1), to obtain single HAPS-CDMA system centre cell capacity M 1and capacity M in single subdistrict in each layer n:
Wherein,
5. the capacity boost method of high altitude communication plateform system according to claim 1, is characterized in that, described step 4-2) in, obtain the HAPS under user's Gaussian Profile and ground CDMA double layer cell power system capacity, algorithm is as follows:
Step 4-2-1, the user of hot zones interference to be analyzed, redefine intra-cell interference I sc' and presence of intercell interference I " oc, suppose f scfor intra-cell interference changed factor, f ocfor presence of intercell interference changed factor, HAPS and CDMA double layer cell system lap region, ground are A ', and center cell remainder is
Step 4-2-2, the Signal Interference and Noise Ratio determining due to base station received signal, i.e. SINR ":
In step 4-2-3, convolution (1), formula (19), formula (20) and formula (21), acquired results obtains the preset constant C' in HAPS and ground CDMA double layer cell system:
Again C' is updated in the formula (10) of the single HAPS-CDMA power system capacity obtained and goes, obtain HAPS and ground CDMA double layer cell power system capacity under user's Gaussian Profile.
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Title
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Publication number Priority date Publication date Assignee Title
CN108242951A (en) * 2016-12-27 2018-07-03 华为技术有限公司 For the methods, devices and systems of High Altitude Platform radio station cooperation covering
WO2018121208A1 (en) * 2016-12-29 2018-07-05 华为技术有限公司 Interference coordination method, high altitude platform station, and base station
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