Clearwire 2008 Annual Report Download - page 26

an ort
h
ogona
lf
requency-
di
v
i
s
i
on mu
l
t
i
p
l
ex
i
ng, w
hi
c
h
we re
f
er to as OFDM, an
d
T
i
me D
i
v
i
s
i
on Dup
l
ex, w
hi
c
h
we
r
efer to as TDD, ph
y
sical la
y
er, which allows us to address two challen
g
es that face wireless carriers, namel
y
non-
line of sight, which we refer to as NLOS, performance and frequency utilization
.
L
ik
et
h
e Expe
di
ence tec
h
no
l
ogy
i
n our pre-W
i
MAX mar
k
ets, mo
bil
eW
i
MAX
i
sa
l
so a w
i
re
l
ess IP-
b
ase
d,
Et
h
ernet p
l
at
f
orm t
h
at
i
sa
l
so
b
u
il
t aroun
d
an OFDM an
d
TDD p
h
ys
i
ca
ll
ayer. OFDM a
ll
ows su
bdi
v
i
s
i
on o
f
bandwidth into multiple frequenc
y
sub-carriers so that data can be divided and transmitted separatel
y
to ensure a
hi
g
h
er re
li
a
bili
ty o
f
pac
k
et
d
ata recept
i
on at t
h
e rece
i
v
i
ng en
d
.T
hi
sc
h
aracter
i
st
i
co
f
OFDM ena
bl
es a 4G networ
k
to
m
ore e
ffi
c
i
ent
ly
serve su
b
scr
ib
ers
i
nur
b
an an
d
su
b
ur
b
an sett
i
n
g
s compare
d
to ex
i
st
i
n
g
3G tec
h
no
l
o
gi
es. Un
like
Frequenc
y
Division Duplex, which requires paired spectrum with
g
uard bands, TDD onl
y
requires a sin
g
le channel
for downlink and uplink, making it more flexible for use in various global spectrum allocations. It also ensures
c
omp
l
ete c
h
anne
l
rec
i
proc
i
t
yf
or
b
etter support o
f
c
l
ose
dl
oop a
d
vance
d
antenna tec
h
no
l
o
gi
es
lik
eMu
l
t
i
p
l
eI
n
Mu
l
t
i
p
l
e Out, or MIMO, an
db
eam
f
orm
i
n
g
.A
ddi
t
i
ona
lly
, TDD a
ll
ows a serv
i
ce prov
id
er to max
i
m
i
ze spectru
m
utilization by allocating up and down link resources appropriate to the traffic pattern over a given market. Finally,
r
a
di
o
d
es
i
gns
f
or TDD are typ
i
ca
ll
y
l
ess comp
l
ex an
dl
ess expens
i
ve to
i
mp
l
ement t
h
an FDD ra
di
os.
R
e
l
at
i
ve to t
h
eot
h
er next
g
enerat
i
on w
i
re
l
ess tec
h
no
l
o
gi
es, we
b
e
li
eve mo
bil
eW
i
MAX a
l
so
h
as t
h
e
f
o
ll
ow
i
n
g
a
d
vanta
g
es
:
•
Op
en Standard
.
M
obile WiMAX technology is based on the 802.16e-200
5
IEEE standard. It is an open
s
tan
d
ar
d
t
h
at
b
u
ild
so
ff
t
h
e success o
f
t
h
e 802.11 IEEE
f
am
il
yo
f
stan
d
ar
d
s more common
l
y
k
nown as W
i
-F
i.
We expect mo
bil
eW
i
MAX to attract man
y
equ
i
pment ven
d
ors
i
nt
h
eITan
d
consumer e
l
ectron
i
c
i
n
d
ustr
i
e
s
just as Wi-Fi has done
.
•
Time-to-Market. Mobile WiMAX has a unique head start over other 4G technologies. The standards for
Long Term Evo
l
ut
i
on, w
hi
c
h
we re
f
er to as LTE, are expecte
d
to
b
e rat
ifi
e
di
n Marc
h
2009, an
d
as a resu
l
t
,
we
d
o not expect commerc
i
a
l
LTE equ
i
pment to
b
ew
id
e
ly d
ep
l
o
y
e
db
e
f
ore 2010, at t
h
e ear
li
est.
•
E
xpansive and Diverse Ecosystem
.
The
g
lobal support of WiMAX continues to build momentum with
m
ore t
h
an 300 W
i
MAX
d
ep
l
oyments now
i
n 118 countr
i
es, an
di
ncum
b
ent w
i
re
l
ess operators
i
n Russ
i
aan
d
I
n
di
a recent
ly
announce
d
a
ddi
t
i
ona
l
comm
i
tments to
d
ep
l
o
y
mo
bil
eW
i
MAX networ
k
s. W
hil
et
h
e
d
ev
i
ce
e
cos
y
stem for 2G and 3G cellular is primaril
y
focused on telecommunications, the WiMAX ecos
y
stem
e
xtends beyond telecommunications and includes the consumer electronics and PC industries
.
R
a
d
io Access Networ
k
Com
p
onent
s
Th
era
di
o access networ
k
covers t
h
e“
l
ast m
il
e” an
d
connects our su
b
scr
ib
ers w
i
t
h
our tower s
i
tes. In our pre
-
Wi
MAX mar
k
ets, t
h
e Expe
di
ence ra
di
o access networ
ki
s compr
i
se
d
o
fb
ase stat
i
on transce
i
vers an
d
mo
d
ems use
d
b
y
our subscribers. The Expedience consumer premises equipment, or CPE, that operates on our pre-WiMAX
n
etwor
ki
s a NLOS w
i
re
l
ess mo
d
em t
h
at connects to any IP-
b
ase
dd
ev
i
ce, suc
h
as a computer or a W
i
-F
i
router,
us
i
ng a stan
d
ar
d
Et
h
ernet connect
i
on. It
i
ss
i
mp
l
eto
i
nsta
ll
an
d
requ
i
res no serv
i
ce prov
id
er con
fi
gurat
i
on or support
and no software download or installation. A subscriber need onl
y
connect the CPE to an external power source an
d
t
o the subscriber’s com
p
uter. In addition to the CPE, we also offer our PC card in all of our United States
p
re-
Wi
MAX mar
k
ets
.
T
he Expedience base station allows for 3
6
0de
g
ree covera
g
eb
y
emplo
y
in
g
multiple transceivers and antennas
on a sin
g
le tower to maximize subscriber densit
y
and spectral efficienc
y
. This setup is scalable, expandable an
d
flexible, allowing us to control costs to promote efficient expansion as our subscriber base grows. Our base stations
g
enera
lly
are
l
ocate
d
on ex
i
st
i
n
g
commun
i
cat
i
ons towers,
b
ut can a
l
so
b
ep
l
ace
d
on roo
f
tops o
fb
u
ildi
n
g
san
d
ot
h
er
el
evate
dl
ocat
i
ons. We
g
enera
lly l
ease our tower
l
ocat
i
ons
f
rom t
hi
r
d
part
i
es
.
We also use a network mana
g
ement s
y
stem that incorporates a complete set of mana
g
ement tools to enable th
e
c
on
fi
gurat
i
on, management, mon
i
tor
i
ng an
d
report
i
ng o
f
a
ll
networ
k
status e
l
ements. T
hi
s system prov
id
es secure
,
c
entra
li
ze
d
an
d
remote con
fig
urat
i
on o
fb
ase stat
i
ons, CPE, sw
i
tc
h
es an
d
ot
h
er networ
k
e
l
ements. T
h
es
y
stem
r
eports to an
d
a
l
erts our s
y
stem a
d
m
i
n
i
strators to a
l
arms an
df
au
l
ts, an
d
mon
i
tors s
y
stem per
f
ormance
d
own to t
he
i
ndividual CPE. It supports customizable report generation to track network performance, utilization and capacity
.
14