Radio-to-Fiber Repeater Placement in Wireless Local-Loop Systems - Multiobjective Optimization Methodology: A Jumping Gene Approach - page 136

except one. of. them. are. to. be. replaced. by. a. randomly. generated. integer. to.
resolve.the.conlict..Referring.to.the.example.in . Figure 6.4 ,.t he.chromosome.
has.a.pair.of.repeating.values,.264,.in.genes.27.and.50.originally..To.turn.it.into.
a.valid.one,.gene.50.has.been.randomly.selected.and.is.replaced.by.a.newly.
generated.integer.value,.say.3,991.

6.7 ResultsandDiscussion
The.parameters.of.WLL.systems.and.multiobjective.evolutionary.algorithms.
(MOEAs).(multiobjective.genetic.algorithm.[MOGA],.niched.Pareto.genetic.
algorithm.2.[NPGA2],.nondominated.sorting.genetic.algorithm.2.[NSGA2],.
strength.Pareto.evolutionary.algorithm.2.[SPEA2],.Pareto.archived.evolution.
strategy. [PAES],. microgenetic. algorithm. [MICROGA],. and. jumping. gene.
[JG]). used. in. the. simulations. are. given. in . Tables 6.2 . and. 6.3 ,. respectively..

Table 6.2
Parameters.of.WLL.Systems

Parameter Value

Total.number.of.grids.in.the.service.area.|N| 10,000

Grid.size 10.×.10.m 2

Total.number.of.terminals.|T| 200.with.uniform.distribution.on.the.total.

number.of.grids

Range.of.total.allowed.number.of.repeaters. R
to.be.installed

5-25

Height.difference.between.the.average.rooftop.
level.and.the.WLL.repeater.antenna.Δ h r

Random.selected.from.the.interval.[1,200].
(unit:.meter)

Horizontal.distance.between.the.WLL.repeater.
and.the.diffracting.edge. d

Random.selected.from.the.interval.[10,200].
(unit:.meter)

Wavelength.λ.(frequency) 3.×.10 8. ms −1. (2.35.×.10 9 .Hz)

WLL.base.station.transmission.power. P 0 40.dBm

Received.signal.strength.at.WLL.repeater. P r −80.dBm

WLL.base.station.antenna.gain. G b 6.dBi

WLL.repeater.antenna.gain.( G r ) j 10.dBi.for.type.I:.Directional.antenna.(120°)

13.dBi.for.type.II:.Directional.antenna.(60°)
16.dBi.for.type.III:.Directional.antenna.(30°)

Maximum.capacity.of.a.repeater. C max 8-40

Installation.cost.of.a.repeater.for.any.grid. C r 5,000

Cost.coefficient.of.repeater.antenna.with.
respect.to.its.gain.α

1,000

Source: Data.from.Chan,.T..M.,.Man,.K..F.,.Tang,.K..S.,.Kwong,.S.,.Multiobjective.optimization.

of.radio-to-iber.repeater.placement.using.a.jumping.gene.algorithm,.in. Proceedingsof
IEEE International Conference on Industrial Technology ,. Hong. Kong,. China,. December.
2005,.291-296.)