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- •Intellectual Property Rights
- •Foreword
- •Modal verbs terminology
- •Introduction
- •1 Scope
- •2 References
- •2.1 Normative references
- •2.2 Informative references
- •3 Definitions, symbols, abbreviations and conventions
- •3.1 Definitions
- •3.2 Symbols
- •3.3 Abbreviations
- •3.4 Conventions
- •4 General characteristics
- •4.1 System overview
- •4.2 System architecture
- •4.3 Audio source coding
- •4.4 Transmission modes
- •4.4.1 Signal bandwidth related parameters
- •4.4.2 Transmission efficiency related parameters
- •4.4.2.0 General
- •4.4.2.1 Coding rates and constellations
- •4.4.2.2 OFDM parameter set
- •5 Source coding modes
- •5.1 Overview
- •5.1.0 Introduction
- •5.1.2 AAC audio coding
- •5.1.3 MPEG Surround coding
- •5.2 Audio super framing
- •5.3.1.0 Introduction
- •5.3.3.0 Introduction
- •5.3.3.1 Frequency Domain coding (AAC based coding and TCX)
- •5.3.3.2 ACELP
- •5.3.3.4 MPS212 parametric stereo
- •5.3.3.5 MDCT based Complex Prediction
- •5.3.3.6 Forward Aliasing Cancellation
- •5.4 AAC coding
- •5.4.3 Parametric Stereo coding
- •5.4.4 AAC error concealment
- •5.4.4.0 Introduction
- •5.4.4.1 Interpolation of one corrupt frame
- •5.4.4.3 Concealment granularity
- •5.4.4.4 SBR error concealment
- •5.4.4.5 Parametric Stereo concealment
- •6 Multiplex definition
- •6.1 Introduction
- •6.2 Main Service Channel (MSC)
- •6.2.1 Introduction
- •6.2.2 Structure
- •6.2.3 Building the MSC
- •6.2.3.0 Introduction
- •6.2.3.1 Multiplex frames
- •6.2.3.2 Hierarchical frames
- •6.2.4 Reconfiguration
- •6.3 Fast Access Channel (FAC)
- •6.3.1 Introduction
- •6.3.2 Structure
- •6.3.3 Channel parameters
- •6.3.4 Service parameters
- •6.3.6 FAC repetition
- •6.4 Service Description Channel (SDC)
- •6.4.1 Introduction
- •6.4.2 Structure
- •6.4.3 Data entities
- •6.4.3.0 Introduction
- •6.4.3.1 Multiplex description data entity - type 0
- •6.4.3.2 Label data entity - type 1
- •6.4.3.3 Conditional access parameters data entity - type 2
- •6.4.3.4 Alternative frequency signalling: Multiple frequency network information data entity - type 3
- •6.4.3.5 Alternative frequency signalling: Schedule definition data entity - type 4
- •6.4.3.6 Application information data entity - type 5
- •6.4.3.7 Announcement support and switching data entity - type 6
- •6.4.3.8 Alternative frequency signalling: Region definition data entity - type 7
- •6.4.3.9 Time and date information data entity - type 8
- •6.4.3.10 Audio information data entity - type 9
- •6.4.3.11 FAC channel parameters data entity - type 10
- •6.4.3.12 Alternative frequency signalling: Other services data entity - type 11
- •6.4.3.13 Language and country data entity - type 12
- •6.4.3.14 Alternative frequency signalling: detailed region definition data entity - type 13
- •6.4.3.15 Packet stream FEC parameters data entity - type 14
- •6.4.3.16 Extension data entity - type 15
- •6.4.3.16.0 General
- •6.4.3.16.1 Service linking information data entity - type 15, extension 0
- •6.4.3.16.2 Other data entity type 15 extensions
- •6.4.4 Summary of data entity characteristics
- •6.4.5 Changing the content of the SDC
- •6.4.6 Signalling of reconfigurations
- •6.4.6.0 Introduction
- •6.4.6.1 Service reconfigurations
- •6.4.6.2 Channel reconfigurations
- •6.5 Text message application
- •6.6 Packet mode
- •6.6.0 Introduction
- •6.6.1 Packet structure
- •6.6.1.0 Introduction
- •6.6.1.1 Header
- •6.6.1.2 Data field
- •6.6.2 Asynchronous streams
- •6.6.3 Files
- •6.6.4 Choosing the packet length
- •6.6.5 Forward Error Correction (FEC) for packet mode streams
- •6.6.5.0 Introduction
- •6.6.5.1 Encoding of FEC Packets
- •6.6.5.2 Transport of FEC packets
- •6.6.5.3 Receiver considerations
- •7 Channel coding and modulation
- •7.1 Introduction
- •7.2 Transport multiplex adaptation and energy dispersal
- •7.2.1 Transport multiplex adaptation
- •7.2.1.0 General
- •7.2.2 Energy dispersal
- •7.3 Coding
- •7.3.1 Multilevel coding
- •7.3.1.0 Introduction
- •7.3.1.1 Partitioning of bitstream in SM
- •7.3.1.2 Partitioning of bitstream in HMsym
- •7.3.1.3 Partitioning of bitstream in HMmix
- •7.3.2 Component code
- •7.3.3 Bit interleaving
- •7.3.3.0 Introduction
- •7.4 Signal constellations and mapping
- •7.5 Application of coding to the channels
- •7.5.1 Coding the MSC
- •7.5.1.0 Introduction
- •7.5.1.2 HMsym
- •7.5.1.3 HMmix
- •7.5.2 Coding the SDC
- •7.5.3 Coding the FAC
- •7.6 MSC cell interleaving
- •7.7 Mapping of MSC cells on the transmission super frame structure
- •8 Transmission structure
- •8.1 Transmission frame structure and robustness modes
- •8.3 Signal bandwidth related parameters
- •8.3.1 Parameter definition
- •8.3.2 Simulcast transmission
- •8.4 Pilot cells
- •8.4.1 Functions and derivation
- •8.4.2 Frequency references
- •8.4.2.0 Introduction
- •8.4.2.1 Cell positions
- •8.4.2.2 Cell gains and phases
- •8.4.3 Time references
- •8.4.3.0 Introduction
- •8.4.3.1 Cell positions and phases
- •8.4.3.2 Cell gains
- •8.4.4 Gain references
- •8.4.4.0 Introduction
- •8.4.4.1 Cell positions
- •8.4.4.2 Cell gains
- •8.4.4.3 Cell phases
- •8.4.4.3.0 Intorduction
- •8.4.4.3.1 Procedure for calculation of cell phases
- •8.4.4.3.2 Robustness mode A
- •8.4.4.3.3 Robustness mode B
- •8.4.4.3.4 Robustness mode C
- •8.4.4.3.5 Robustness mode D
- •8.4.4.3.6 Robustness mode E
- •8.4.5 AFS references
- •8.4.5.0 Introduction
- •8.4.5.1 Cell positions and phases
- •8.4.5.2 Cell gains
- •8.5 Control cells
- •8.5.1 General
- •8.5.2 FAC cells
- •8.5.2.1 Cell positions
- •8.5.2.2 Cell gains and phases
- •8.5.3 SDC cells
- •8.5.3.1 Cell positions
- •8.5.3.2 Cell gains and phases
- •8.6 Data cells
- •8.6.1 Cell positions
- •8.6.2 Cell gains and phases
- •B.1 Robustness modes A, B, C and D
- •B.2 Robustness mode E
- •F.0 Introduction
- •F.2 Possibilities of the announcement feature
- •F.3 SDC data entities overview for Alternative Frequency and announcement signalling
- •F.4 SDC data entities and setup for alternative frequency signalling
- •F.5 SDC data entities and setup for announcement
- •F.6 Alternative frequency and announcement signalling - coding example
- •G.0 Introduction
- •G.1 Alternative Frequency checking and Switching (AFS)
- •G.2 Station buttons for DRM services
- •G.3 Seamless Alternative Frequency checking and Switching (AFS)
- •G.4 Character sets
- •Annex I: (void)
- •Annex N: (void)
- •R.1 Overview
- •R.2 General network timing considerations
- •R.3 Network synchronization rules
- •R.4 Receiver implementation rules
- •R.5 Definition of broadcast signal time references
- •T.0 Introduction
- •T.1 Domestic services
- •T.2 International services
- •History
129 |
ETSI ES 201 980 V4.1.2 (2017-04) |
8.4.5AFS references
8.4.5.0Introduction
The AFS reference cells are only provided in robustness mode E. These cells are located in the fifth OFDM symbol, i.e. s = 4, of the first transmission frame and the fortieth symbol, i.e. s = 39, of the fourth transmission frame.
The AFS reference cells are mainly used to improve the channel estimation in the AFS case and to make "snooping" at another frequency more reliable. The AFS reference cells of OFDM symbol s = 39 in the fourth transmission frame make it possible to complete the channel estimation in a proper way before switching to the alternative frequency. The AFS reference cells of OFDM symbol s = 4 in the first transmission frame are part of the SDC symbols and help to improve the channel estimation on return to the original frequency.
8.4.5.1Cell positions and phases
Table 61 defines the positions and phases of the AFS reference cells, for the fifth OFDM symbol i.e. s = 4 of the first transmission frame and the fortieth symbol i.e. s = 39 of the fourth transmission frame.
Table 61: Phase of AFS reference cells for robustness mode E
Carrier index k |
Phase index, ϑ1024[0, k] s = 4 |
Phase index, ϑ1024[0, k] s = 39 |
|
||
-106 |
134 |
115 |
-102 |
866 |
135 |
-98 |
588 |
194* |
-94 |
325* |
293 |
-90 |
77 |
431 |
-86 |
868 |
608 |
-82 |
649 |
825* |
-78 |
445* |
57 |
-74 |
256 |
353 |
-70 |
82 |
688 |
-66 |
946 |
38* |
-62 |
801* |
452 |
-58 |
671 |
905 |
-54 |
556 |
373 |
-50 |
455 |
905* |
-46 |
369* |
452 |
-42 |
298 |
39 |
-38 |
242 |
689 |
-34 |
200 |
354* |
-30 |
173* |
59 |
-26 |
161 |
827 |
-22 |
164 |
610 |
-18 |
181 |
433* |
-14 |
213* |
295 |
-10 |
260 |
197 |
-6 |
322 |
138 |
-2 |
398 |
118* |
2 |
489* |
138 |
6 |
595 |
197 |
10 |
716 |
295 |
14 |
851 |
433* |
18 |
1 001* |
610 |
22 |
142 |
827 |
26 |
322 |
59 |
30 |
516 |
354* |
34 |
725* |
689 |
38 |
949 |
39 |
42 |
164 |
452 |
46 |
417 |
905* |
50 |
685* |
373 |
54 |
968 |
905 |
ETSI
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