atsc 3.0 technical overview - rohde & schwarz...atsc 3.0 technical overview rf1 r&sc...

2
www.rohde-schwarz.com/technology/ATSC 3.0 ATSC 3.0 frame structure An 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. Bootstrap Preamble Frame Time Frequency Subframe 0 Subframe n–1 ●●● ATSC 3.0 spectrum Due to the smaller bandwidth, the bootstrap is clearly visible in the ATSC 3.0 spectrum 16QAM non-uniform constellation (NUC) diagram 1.5 1 0.5 0 –0.5 –1 –1.5 –1.5 –1 –0.5 0 0.5 1 1.5 Re(x 1 ) Im(x 1 ) 0100 0000 0001 0101 0110 0010 0111 0011 1110 1010 1111 1011 1001 1101 1000 1100 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 interleaver PLPn Bit interleaved coding and modulation (BICM) PLPn NUC mapper Framing PLPn Time interleaving (CTI: single PLP, CCR only) Framing and interleaving Time interleaving (HTI: single PLP VCR/ multiple PLP) Frequency interleaver Encapsulation and compression Baseband formatting ALP packets Data Scheduler Pilot insertion MISO IFFT PAPR Guard interval insertion Bootstrap RF1 ATSC 3.0 Technical overview Rohde & Schwarz solutions for ATSC 3.0 R&S®BTC broadcast test center R&S®TMU9/R&S®TMV9 TV transmitter R&S®THU9/R&S®THV9 TV 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 flexibility, greater robustness and more efficient operation. It employs state-of-the-art encoding and modulation technologies, enabling a significantly 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 first 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-efficient 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 flexible 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 fixed receivers. Key features OFDM technology spectrum-efficient Layer division multiplexing flexible coverage of services IP-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 Injection level controller Power normalizer Core layer Enhanced layer LDM constellation superposition OFDM parameters Parameter 8K FFT 16K FFT 32K FFT Number of carriers NoC C red_coeff = 0 6913 13825 27649 C red_coeff = 1 6817 13633 27265 C red_coeff = 2 6721 13441 26881 C red_coeff = 3 6625 13249 26497 C red_coeff = 4 6529 13057 26113 Duration T U 8192 T 16384 T 32768 T Duration T U (µs) 1), 2) 1185.185 2370.370 4740.741 Carrier spacing 1/T U (Hz) 2) 843.75 421.875 210.9375 Spacing between carriers 0 and NoC – 1 in MHz: (NoC–1)/T U 2) C red_coeff = 0 5.832 5.832 5.832 C red_coeff = 1 5.751 5.751 5.751 C red_coeff = 2 5.670 5.670 5.670 C red_coeff = 3 5.589 5.589 5.589 C red_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.

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Page 1: ATSC 3.0 Technical overview - Rohde & Schwarz...ATSC 3.0 Technical overview RF1 R&SC broadcast test center R&SR&S transmitter R&SHR&SH transmitter ATSC 3.0 (Advanced Television Systems

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

Page 2: ATSC 3.0 Technical overview - Rohde & Schwarz...ATSC 3.0 Technical overview RF1 R&SC broadcast test center R&SR&S transmitter R&SHR&SH transmitter ATSC 3.0 (Advanced Television Systems

Broadcast & Media

Poster | 01.00

ATSC

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Tech

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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

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1)

Num

eric

al v

alue

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ital

ics

are

appr

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ate

valu

es.

2)

Val

ues

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bsr_

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nt =

2 a

nd s

yste

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idth

= 6

MH

z.

ATS

C_3

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en_v

0100

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1

30.0

3.20

16

16:1

5:23

ATSC_3_po_en_v0100.indd 2 30.03.2016 16:17:16