verLoadi
gAlgorithmforDataTra
smissio
overSpectrallyShapedCha
elsIEEETra
so
Commu
icatio
sVol43No234pp773775FebMarApr1995
fu
ctio
bits_alloce
ergy_allocchow_algoSNR
um_subcM
fori1
um_subc
Assumi
geachofthesubcha
elshasaflatfadi
gwegeti
itialestimate
ofthebitsforeachsubcha
el
tempbits
log21absSNRi
bitspertwodime
sio
rou
dtempbitsrou
dtempbits
rou
dthebits
ifrou
dtempbits8rou
dtempbits8
e
d
Limitthembetwee
2a
d15
ifmodrou
dtempbits21rou
dtempbits1rou
dtempbitsrou
dtempbits1
e
d
ifrou
dtempbits0
CalculatetheE
ergyrequired
forthesubcha
el
e
ergy_alloci2rou
dtempbits1SNRi
else
e
ergy_alloci0
e
d
bits_allocirou
dtempbitse
d
UpdatetheBitSubCha
e
doffu
ctio
E
ergyTableI
itmGive
theSNRvaluesformatableofe
ergyi
creme
tsforeachcha
elfu
ctio
e
ergytableE
ergyTableI
itSNRM
I
puts
subcar_gai
sSubcarrierGai
s
MmaxCo
stellatio
Size
GapGapofthesystem
NoiseNoisePower
Outputs
e
ergytableE
ergytable
Basedo
theSubcarrierGai
swecalculatethee
ergy
i
creme
trequiredbyeachsubcarrierfortra
smitti
g
12468bits
E
ergy2i1subcar_gai
s
f
subcar_gai
ssubcar_gai
s2GapNoise
e
ergytableabs1SNR21M11
I
creasethee
ergyvalueforco
stellatio
sizeofmoretha
Mtoaveryhighvaluesothatitis
otassig
ed
e
ergytableM1I
fo
essizee
ergytableM1
fori32Me
ergytableie
ergytableie
ergytablei12e
ergytablei1e
ergytablei
e
d
e
ergytableo
es1sizee
ergytable1e
ergytablecampello_algomApplyCampellosalgorithmtoco
vergetotheoptimalbita
de
ergyallocatio
forthegive
cha
elco
ditio
scampello_algomThisfu
ctio
isusedbyCampellosalgorithmtoallocatebitsa
de
ergyforeachsubcha
eloptimally
fu
ctio
bits_alloce
ergy_alloccampello_algobits_alloce
ergy_alloce
ergytabletotal_bits
um_subcM
btsumbits_alloc
Weca
ttra
smitmoretha
MNumberofsubcha
elbitsiftotal_bitsM
um_subc
total_bitsM
um_subce
d
whilebttotal_bitsifbttotal_bits
max_val0max_i
dceilra
d1
um_subc
fori1
um_subc
ifbits_alloci0tempe
ergytableibits_alloci
elsetemp0
e
d
iftempmax_valmax_valtempmax_i
di
e
d
fe
d
ifbits_allocmax_i
d0bits_allocmax_i
dbits_allocmax_i
d1e
ergy_allocmax_i
de
ergy_allocmax_i
dmax_valbtbt1
e
d
else
mi
_valI
fmi
_i
dceilra
d1
um_subcfori1
um_subc
ifbits_alloci0bits_alloci9tempe
ergytableibits_alloci1
elsetempI
f
e
diftempmi
_val
mi
_valtempmi
r
