无线宽频网络设计规划研究报告.doc

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无线宽频网络设计规划争辩报告
7/2/2005
Introduction
Coverage,interference,,,thisRSLprovidesthesystemwithenoughS/,theS/.
含盖,干扰,
.(Downlink)及上行(Uplink)(RSL)应当满足系统中主讯号与噪声的比值(S/N)..
Theco-,,arbitrarilyraisingtransmitterpowerdoesnotseemtobeaviablesolution.
同频干扰和噪声对R/
(SIR),.
Theco-,atimeslotinaTDMAsystem,-,theco-.

.来造就一个最优良的通讯系统.
,,thetransmitterpowersneedbehigh,orhightowerneedbeusedsothateachtowerhasawidercoveragearea.
..
Otherfactors,likechannelassignment,antennagains,orientationbothintheverticalandhorizontaldirections,powercontrol,,,twoWi-FiRFsystemsareconsideredtoillustratesomeofthedesignaspectsofarealcellularsystem.
有关其它可能影响到R/-
Inthisarticle,outdoorareasneedbecoveredupto90%,threenon-overlappingchannelsareusedwhenco-.
%(WiFi).
Coverage
’s,s1–s60,,,,’sarecalculatedaccordingtothefollowingformula:
.().(s1—s60).,000个小格子.(cell),(最低接收功率)的计算公式如下:
RSSI=20dBm–pathloss–17dB (1)
ThefirsttermistheAPEIRP,100mw,,cluttering,--,onehastomakesurethatthecorrectpatternsareused.
第一个要件是AP的EIRP.(最大输出功率)为100mw,-.

Figure1Systemwith60AP’sandbuildupareas.

Figure2Verticalantennapattern.
First,,iftheRSSIofatleastoneAPishigherthanthethresholdof-80dBm,’sareusedisshowninFigure3.
首先计算downlinkcoverage,-80dBm,.
Figure3Coverageof60AP’%,with-17dBbuildinglossandRSSLof–80dBm.
FortheRSSIcalculations,-’’(3ft).,,theycanhavearbitraryshapes.
-(EIRP).(3ft)
Sincethepopulation/trafficdistributionisnotknownatthistime,,’s,%.
%.
WhatwewanttoaccomplishnextistoselectaminimumnumberofAP’stoachievetherequired90%(SimulatedAnnealing)[3],weneedanOF(ObjectiveFunction).ThisOFforthesystemhastwotermsasbelow: