atsc 3.0 technical overview - rohde & schwarz...atsc 3.0 technical overview rf1 r&sc...
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www.rohde-schwarz.comwww.rohde-schwarz.com/technology/ATSC 3.0
ATSC 3.0 frame structureAn ATSC 3.0 frame consists of a bootstrap, preamble and one or more subframes. The bootstrap and preamble contain the basic signaling infor-mation and the L1 signaling data for the frame. One subframe can carry the payload of one or multiple PLPs.
Boot
stra
p
Prea
mbl
e
Frame
Time
Freq
uenc
y
Subframe 0 Subframe n–1● ● ●
ATSC 3.0 spectrumDue to the smaller bandwidth, the bootstrap is clearly visible in the ATSC 3.0 spectrum
16QAM non-uniform constellation (NUC) diagram1.5
1
0.5
0
–0.5
–1
–1.5–1.5 –1 –0.5 0 0.5 1 1.5
Re(x1)
Im(x
1)
0100 0000
00010101 0110 00100111 0011
1110 10101111 1011
10011101
10001100
For non-uniform constellations, the points in a constellation diagram are not equidistant for in-phase and quadrature com-ponents. For each LDPC code rate, a specific NUC is defined to maximize spectral efficiency.
ATSC 3.0 block diagram
Waveform generation
PLP0●●●
PLPn
Input formatting
FEC(BCH/CRC, LDPC)
Bit interleaverPLPn
Bit interleaved coding and modulation (BICM)
PLPnNUC mapper
FramingPLPn
Time interleaving(CTI: single PLP, CCR only)
Framing and interleaving
Time interleaving(HTI: single PLP VCR/multiple PLP)
Frequencyinterleaver
Encapsulation and compression
Basebandformatting
ALP packetsData
Scheduler
Pilotinsertion
MISOIFFTPAPRGuard intervalinsertion
BootstrapRF1
ATSC 3.0 Technical overview
Rohde & Schwarz solutions for ATSC 3.0
R&S®BTC broadcast test center R&S®TMU9/R&S®TMV9TV transmitter
R&S®THU9/R&S®THV9TV transmitter
ATSC 3.0 (Advanced Television Systems Committee) is a digital terrestrial broadcasting standard that has been substantially enhanced compared with the ATSC A/53 predecessor standard. ATSC 3.0 is designed to allow network operators more fl exibility, greater robustness and more effi cient operation. It employs state-of-the-art encoding and modulation technologies, enabling a signifi cantly more effective use of the limited spectrum resources. In this way, capacity is created to transfer UHD video contents and immersive audio contents to the end user via terrestrial networks, using a minimum of resources. The consistent focus on IP technology in the baseband makes it possible to merge cost-effective terrestrial broadcasting with other IP-based services.
ATSC 3.0 is the fi rst ATSC standard to employ coded orthogonal frequency division multiplexing (COFDM). This modulation method uses a large number of orthogonal carriers, resulting in a signal that is robust against interference. COFDM technology also makes it possible to set up spectrum-effi cient ATSC 3.0 single-frequency networks (SFN).
Use of the latest low density parity check (LDPC) codes in combination with Bose-Chaudhuri-Hocquenghem (BCH) codes allows the usable channel capacity to approach the theoretical Shannon limit, as does the use of non-uniform constellations (NUC) for modulation. ATSC 3.0 employs multiple physical layer pipe (multiple PLP) technology, enabling a fl exible use of the channel. Using modern technologies such as layer division multiplexing (LDM), it is possible to implement effective, simultaneous transmission to mobile as well as fi xed receivers.
Key featuresOFDM technology spectrum-effi cientLayer division multiplexing fl exible coverage of servicesIP-based content delivery designed for UHDTV and HDR
Layer division multiplexing (LDM)LDM allows for a spectrum-efficent constellation superposition of multiple PLPs at different power levels for transmission in one RF channel. Different PLPs can have different FEC and modulation parameters. This gives flexibility to broadcasters to design the individual layers for robustness and payload capacity as required for different reception conditions.
1.5
1
0.5
0
–0.5
–1
–1.5–1.5 –1 –0.5 0 0.5 1 1.5
Real
Imag
1
0.5
0
–0.5
–1–1 –0.5 0 0.5 1
Real
Imag
2
1
0
–1
–2–2 –1 0 1 2
Real
Imag
Real
Injectionlevelcontroller
Powernormalizer
Core layer
Enhanced layer
LDM constellation superposition
OFDM parametersParameter 8K FFT 16K FFT 32K FFT
Number of carriers NoC Cred_coeff = 0 6913 13825 27649
Cred_coeff = 1 6817 13633 27265
Cred_coeff = 2 6721 13441 26881
Cred_coeff = 3 6625 13249 26497
Cred_coeff = 4 6529 13057 26113
Duration TU 8192 T 16384 T 32768 T
Duration TU (µs) 1), 2) 1185.185 2370.370 4740.741
Carrier spacing 1/TU (Hz) 2) 843.75 421.875 210.9375
Spacing between carriers 0 and NoC – 1 in MHz:(NoC–1)/TU
2)
Cred_coeff = 0 5.832 5.832 5.832
Cred_coeff = 1 5.751 5.751 5.751
Cred_coeff = 2 5.670 5.670 5.670
Cred_coeff = 3 5.589 5.589 5.589
Cred_coeff = 4 5.508 5.508 5.508
1) Numerical values in italics are approximate values.2) Values for bsr_coefficient = 2 and system_bandwidth = 6 MHz.
ATSC_3_po_en_v0100.indd 1 30.03.2016 16:17:15
Broadcast & Media
Poster | 01.00
ATSC
3.0
Tech
nica
l ove
rvie
wPoster
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ATS
C 3.0 Technical O
verview; Poster
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ATSC
3.0
ATS
C 3
.0 f
ram
e st
ruct
ure
An
ATS
C 3
.0 f
ram
e co
nsis
ts o
f a
boot
stra
p, p
ream
ble
and
one
or m
ore
subf
ram
es. T
he b
oots
trap
and
pre
ambl
e co
ntai
n th
e ba
sic
sig
nalin
g in
for-
mat
ion
and
the
L1 s
igna
ling
dat
a fo
r th
e fr
ame.
One
sub
fram
e ca
n ca
rry
the
payl
oad
of o
ne o
r m
ultip
le P
LPs.
Bootstrap
Preamble
Fram
e
Tim
e
Frequency
Subf
ram
e 0
Subf
ram
e n–
1●●●
ATS
C 3
.0 s
pec
tru
mD
ue t
o th
e sm
alle
r ba
ndw
idth
, the
boo
tstr
ap is
cle
arly
vi
sibl
e in
the
ATS
C 3
.0 s
pect
rum
16
QA
M n
on
-un
iform
con
stel
lati
on
(N
UC
) d
iag
ram
1.5 1
0.5 0
–0.5 –1
–1.5
–1.5
–1–0
.50
0.5
11.
5
Re(x
1)
Im(x1)
0100
0000
0001
0101
0110
0010
0111
0011
1110
1010
1111
1011
1001
1101
1000
1100
For
non-
unifo
rm c
onst
ella
tions
, th
e po
ints
in a
con
stel
latio
n di
agra
m a
re n
ot e
quid
ista
nt f
or
in-p
hase
and
qua
drat
ure
com
-po
nent
s. F
or e
ach
LDP
C c
ode
rate
, a s
peci
fic N
UC
is d
efin
ed
to m
axim
ize
spec
tral
eff
icie
ncy.
ATS
C 3
.0 b
lock
dia
gra
m
Wav
efor
m g
ener
atio
n
PLP0
● ● ● PLPn
Inpu
t for
mat
ting
FEC
(BCH
/CRC
, LDP
C)
Bit i
nter
leav
erPL
Pn
Bit i
nter
leav
ed c
odin
g an
d m
odul
atio
n (B
ICM
)
PLPn
NUC
map
per
Fram
ing
PLPn
Tim
e in
terle
avin
g(C
TI: s
ingl
e PL
P, C
CR o
nly)
Fram
ing
and
inte
rleav
ing
Tim
e in
terle
avin
g(H
TI: s
ingl
e PL
P VC
R/m
ultip
le P
LP)
Freq
uenc
yin
terle
aver
Enca
psul
atio
n an
d co
mpr
essi
onBa
seba
ndfo
rmat
ting
ALP
pack
ets
Data
Sche
dule
r
Pilo
tin
serti
onM
ISO
IFFT
PAPR
Guar
d in
terv
alin
serti
onBo
otst
rap
RF1ATSC
3.0
Tec
hnic
al o
verv
iew
Rohd
e & S
chw
arz s
olut
ions
for A
TSC
3.0
R&
S®B
TC
bro
adca
st t
est
cen
ter
R&
S®T
MU
9/R
&S
®TM
V9
TV
tra
nsm
itte
rR
&S
®TH
U9
/R&
S®T
HV
9TV
tra
nsm
itte
r
ATSC
3.0
(Adv
ance
d Te
levi
sion
Sys
tem
s Co
mm
ittee
) is
a di
gita
l ter
rest
rial b
road
cast
ing
stan
dard
that
has
bee
n su
bsta
ntia
lly e
nhan
ced
compared with the ATSC A/53 predecessor standard. ATSC 3.0 is designed to allow network operators more fl exibility, greater robustness
and more effi cient operation. It employs state-of-the-art encoding and modulation technologies, enabling a signifi cantly more effective use
of the limited spectrum resources. In this way, capacity is created to transfer UHD video contents and immersive audio contents to the end
user via terrestrial networks, using a minimum of resources. The consistent focus on IP technology in the baseband makes it possible to
merge cost-effective terrestrial broadcasting with other IP-based services.
ATSC 3.0 is the fi rst ATSC standard to employ coded orthogonal frequency division multiplexing (COFDM
). This modulation method uses a
large number of orthogonal carriers, resulting in a signal that is robust against interference. COFDM
technology also makes it possible to
set up spectrum-effi cient ATSC 3.0 single-frequency networks (SFN).
Use of the latest low density parity check (LDPC) codes in combination with Bose-Chaudhuri-Hocquenghem (BCH) codes allows the usable
channel capacity to approach the theoretical Shannon limit, as does the use of non-uniform constellations (NUC) for modulation. ATSC 3.0
employs multiple physical layer pipe (multiple PLP) technology, enabling a fl exible use of the channel. Using modern technologies such as
layer division multiplexing (LDM
), it is possible to implement effective, simultaneous transmission to mobile as well as fi xed receivers.
Key
fea
ture
sOFDM
technology
spectrum-effi cient
Layer division multiplexing
fl exible coverage of services
IP-based content delivery
designed for UHDTV and HDR
Lay
er d
ivis
ion
mu
ltip
lexi
ng
(LD
M)
LDM
allo
ws
for
a sp
ectr
um-e
ffic
ent
cons
tella
tion
supe
rpos
ition
of
mul
tiple
PLP
s at
diff
eren
t po
wer
leve
ls f
or t
rans
mis
sion
in
one
RF
chan
nel.
Diff
eren
t P
LPs
can
have
diff
eren
t FE
C a
nd m
odul
atio
n pa
ram
eter
s. T
his
giv
es f
lexi
bilit
y to
bro
adca
ster
s to
de
sig
n th
e in
divi
dual
laye
rs f
or r
obus
tnes
s an
d pa
yloa
d ca
paci
ty a
s re
quire
d fo
r di
ffer
ent
rece
ptio
n co
nditi
ons.
1.5 1
0.5 0
–0.5 –1
–1.5
–1.5
–1–0
.50
0.5
11.
5
Real
Imag
1
0.5 0
–0.5 –1
–1–0
.50
0.5
1
Real
Imag
2 1 0 –1 –2–2
–10
12
Real
Imag
Real
Inje
ctio
nle
vel
cont
rolle
r
Pow
erno
rmal
izer
Core
laye
r
Enha
nced
laye
r
LDM
con
stel
latio
n su
perp
ositi
on
OFD
M p
aram
eter
sPar
amet
er8
K F
FT1
6K
FFT
32
K F
FT
Num
ber
of c
arrie
rs N
oCC
red_
coef
f = 0
69
1313
825
2764
9
Cre
d_co
eff =
168
1713
633
2726
5
Cre
d_co
eff =
267
2113
441
2688
1
Cre
d_co
eff =
366
2513
249
2649
7
Cre
d_co
eff =
465
2913
057
2611
3
Dur
atio
n T U
8192
T16
384
T32
768
T
Dur
atio
n T U
(µs)
1), 2
)11
85.1
85
2370
.370
47
40.7
41
Car
rier
spac
ing
1/T
U (H
z) 2)
843.
7542
1.87
521
0.93
75
Spa
cing
bet
wee
n ca
rrie
rs 0
and
NoC
– 1
in
MH
z:(N
oC–1
)/T U
2)
Cre
d_co
eff =
0
5.83
2 5.
832
5.83
2
Cre
d_co
eff =
15.
751
5.75
1 5.
751
Cre
d_co
eff =
25.
670
5.67
0 5.
670
Cre
d_co
eff =
35.
589
5.58
9 5.
589
Cre
d_co
eff =
45.
508
5.50
8 5.
508
1)
Num
eric
al v
alue
s in
ital
ics
are
appr
oxim
ate
valu
es.
2)
Val
ues
for
bsr_
coef
ficie
nt =
2 a
nd s
yste
m_b
andw
idth
= 6
MH
z.
ATS
C_3
_po_
en_v
0100
.indd
1
30.0
3.20
16
16:1
5:23
ATSC_3_po_en_v0100.indd 2 30.03.2016 16:17:16