1、 ETSI TS 102 551-2 V1.1.1 (2006-12)Technical Specification Satellite Earth Stations and Systems (SES);Satellite Digital Radio (SDR) Systems;Inner Physical Layer of the Radio Interface;Part 2: Multiple carrier transmissionETSI ETSI TS 102 551-2 V1.1.1 (2006-12) 2 Reference DTS/SES-00285-2 Keywords di
2、gital, layer 1, radio, satellite ETSI 650 Route des Lucioles F-06921 Sophia Antipolis Cedex - FRANCE Tel.: +33 4 92 94 42 00 Fax: +33 4 93 65 47 16 Siret N 348 623 562 00017 - NAF 742 C Association but non lucratif enregistre la Sous-Prfecture de Grasse (06) N 7803/88 Important notice Individual cop
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5、us of this and other ETSI documents is available at http:/portal.etsi.org/tb/status/status.asp If you find errors in the present document, please send your comment to one of the following services: http:/portal.etsi.org/chaircor/ETSI_support.asp Copyright Notification No part may be reproduced excep
6、t as authorized by written permission. The copyright and the foregoing restriction extend to reproduction in all media. European Telecommunications Standards Institute 2006. All rights reserved. DECTTM, PLUGTESTSTM and UMTSTM are Trade Marks of ETSI registered for the benefit of its Members. TIPHONT
7、Mand the TIPHON logo are Trade Marks currently being registered by ETSI for the benefit of its Members. 3GPPTM is a Trade Mark of ETSI registered for the benefit of its Members and of the 3GPP Organizational Partners. ETSI ETSI TS 102 551-2 V1.1.1 (2006-12) 3 Contents Intellectual Property Rights4 F
8、oreword.4 1 Scope 5 2 References 5 3 Definitions, symbols and abbreviations .5 3.1 Definitions5 3.2 Symbols5 3.3 Abbreviations .5 4 Inner physical layer - Multi Carrier6 4.1 Interfacing to OPL (Outer Physical Layer) 6 4.2 The profile approach - different multi carrier modes .7 4.2.1 Profile definiti
9、on.7 4.2.2 Modes definition.8 4.2.3 Parameters for QPSK subcarrier mapping 8 4.2.4 Parameters for 16QAM subcarrier mapping.9 4.3 Generation of one Phy section9 4.3.1 Overview 9 4.3.1.1 Overview of mode 110 4.3.1.2 Overview of mode 2, 3 and 4 11 4.3.2 RFU section insertion and Bit padding.11 4.3.3 En
10、ergy dispersal (scrambling) 12 4.4 Pilot tone insertion and signalling 12 4.4.1 Mode 1: 2k5MHz; identical to DVB-T .12 4.4.1.1 Reference to EN 300 744 12 4.4.2 Mode 2: 2k5MHz 13 4.4.2.1 Preamble insertion.13 4.4.2.2 Scattered pilots15 4.4.2.3 Continuous pilots 16 4.4.3 Mode 3: 1k1,7MHz .16 4.4.3.1 P
11、reamble insertion.17 4.4.3.2 Scattered pilots18 4.4.3.3 Continuous pilots 19 4.4.4 Mode 4: 0,5k1,7MHz 19 4.4.4.1 Preamble insertion.20 4.4.4.2 Scattered pilots21 4.4.4.3 Continuous pilots 22 4.5 Bit mapping to constellation.22 4.5.1 QPSK Modulation 22 4.5.2 16QAM Modulation (non-hierarchical)23 4.5.
12、3 16QAM Modulation (hierarchical) .23 4.5.4 Normalization of power levels24 4.6 Pulse shaping and guard interval insertion .24 Annex A (informative): Bibliography.26 History 27 ETSI ETSI TS 102 551-2 V1.1.1 (2006-12) 4 Intellectual Property Rights IPRs essential or potentially essential to the prese
13、nt document may have been declared to ETSI. The information pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found in ETSI SR 000 314: “Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in res
14、pect of ETSI standards“, which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web server (http:/webapp.etsi.org/IPR/home.asp). Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee can be given as to th
15、e existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web server) which are, or may be, or may become, essential to the present document. Foreword This Technical Specification (TS) has been produced by ETSI Technical Committee Satellite Earth Stations and Systems (S
16、ES). An SDR system enables broadcast to fixed and mobile receivers through satellites and complementary terrestrial transmitters. Functionalities, architecture and technologies of such systems are described in TR 102 525 (see bibliography). The present document is part 2 of a multi-part deliverable
17、covering the Satellite Digital Radio (SDR) Systems; Inner Physical Layer of the Radio Interface, as identified below: Part 1: “Single carrier transmission“; Part 2: “Multiple carrier transmission“. Several existing and planned ETSI standards specify parts of the SDR system, with the aim of interoper
18、able implementations. The physical layer of the radio interface (air interface) is divided up into the outer physical layer, the inner physical layer with a single carrier transmission, and the inner physical layer with multiple carriers transmission. These parts can be used all together in SDR comp
19、liant equipment, or in conjunction with other existing and future specifications. The present document specifies the inner physical layer with multiple carrier transmission. The inner physical layer with single carrier transmission is specified in TS 102 551-1 (see bibliography), and the outer physi
20、cal layer in TS 102 550 (see bibliography). ETSI ETSI TS 102 551-2 V1.1.1 (2006-12) 5 1 Scope The present document concerns the radio interface of SDR broadcast receivers. It specifies functionality of the inner physical layer. It allows implementing this part of the system in an interoperable way.
21、The present document specifies the case of multiple carrier transmission, whereas TS 102 551-1 (see bibliography) specifies single carrier transmission. 2 References The following documents contain provisions which, through reference in this text, constitute provisions of the present document. Refer
22、ences are either specific (identified by date of publication and/or edition number or version number) or non-specific. For a specific reference, subsequent revisions do not apply. For a non-specific reference, the latest version applies. Referenced documents which are not found to be publicly availa
23、ble in the expected location might be found at http:/docbox.etsi.org/Reference. NOTE: While any hyperlinks included in this clause were valid at the time of publication ETSI cannot guarantee their long term validity. 1 ETSI EN 300 744 (V1.5.1): “Digital Video Broadcasting (DVB); Framing structure, c
24、hannel coding and modulation for digital terrestrial television“. 3 Definitions, symbols and abbreviations 3.1 Definitions For the purposes of the present document, the following terms and definitions apply: : constellation ratio which determines the QAM constellation for the modulation for hierarch
25、ical transmission 3.2 Symbols For the purposes of the present document, the following symbols apply: 2k5MHz OFDM with 2k (i.e. 2 048 length) IFFT in 5 MHz channel spacing hierarchical constellation scaling factor 3.3 Abbreviations For the purposes of the present document, the following abbreviations
26、 apply: 16QAM 16 Quadrature Amplitude Modulation AMSS Amplitude Modulated Spreading Sequence C-TS Channel Transport Stream CU Capacity Unit DVB Digital Video Broadcasting IFFT Inverse Fast Fourier Transform IPL Inner Physical Layer IPL-MC Inner Physical Layer, Multiple Carrier IPL-SC Inner Physical
27、Layer, Single Carrier ETSI ETSI TS 102 551-2 V1.1.1 (2006-12) 6 MPEG-TS MPEG Transport Stream OPL Outer Physical Layer QPSK Quaternary Phase Shift Keying RF Radio Frequency RFU Reserved for Future Use S-TS Service Transport Stream TPS Transmission Parameter Signalling TS ETSI Technical Specification
28、 XOR Exclusive OR 4 Inner physical layer - Multi Carrier The functionality of the Inner Physical Layer (Multi Carrier), in the following denoted IPL-MC, is to provide a robust modulation scheme for multi carrier transmission. The multi carrier transmission is applicable either to satellite or terres
29、trial transmission. The IPL-MC is embedded between the OPL (C-TS delivery) and the RF frontend (modulation) as depicted in Figure 1. Figure 1: General block diagram of the ETSI SES SDR system concept with selection of IPL-MC The general block diagram of the IPL-MC functionality is given in Figure 2.
30、 Figure 2: Block diagram of the ETSI SES SDR compliant IPL-MC To achieve maximum commonalities with existing, wide-spread standards like DVB-T and its successor DVB-H, one profile is based on EN 300 744 1. To increase the robustness in rapidly changing channels or high delay spread scenarios, three
31、modes using a higher pilot density together with a distinct frequency-domain preamble are introduced. 4.1 Interfacing to OPL (Outer Physical Layer) Its interface to the OPL (Outer Physical Layer) is the C-TS (channel transport stream), which is defined in TS 102 550 (see bibliography). For this spec
32、ial IPL-MC, the parameters which are passed to the OPL are derived within TS 102 550 (see bibliography). ETSI ETSI TS 102 551-2 V1.1.1 (2006-12) 7 Two types of IPL-MC exist: One providing a single-input C-TS interface, another providing double-input interface to allow hierarchical modulation. In the
33、 latter case, both C-TS need to be aligned in time, framing and throughput. If more than one carrier needs to be supported, multiple instances of the IPL-MC need to be instantiated in parallel. The parameters that are passed to the OPL are as follows: frame length in integer number of CU (capacity u
34、nits); frame length in number of IPL-MC symbols; number of inputs (to distinguish between normal and hierarchical transmission). For mode 1, one IPL-MC frame equals the DVB-T superframe. The OFDM frame of DVB-T is called Phy section. Four Phy sections compose on IPL-MC frame in mode 1. For modes 2 t
35、o 4, one IPL-MC frame is composed of five Phy sections and preceded by one preamble. Their parameters are defined in clause 4.2.2. With these parameters, the exact throughput of the IPL-MC can be derived in CU per time. The smallest unit to be processed by the IPL-MC is one CU. To be able to benefit
36、 from the gain of hybrid configurations (e.g. using IPL-SC together with IPL-MC), it is mandatory to have equal frame lengths on both IPLs. If modes 2, 3 or 4 of the IPL-MC are used, the joint frame length of 432 ms is chosen for the IPL-MC frame length. For mode 1 of the IPL-MC, the joint frame len
37、gth is 487,424 ms (4 121,856 ms) or 438,68 ms (4 109,67 ms), dependent on the selection of the guard interval. 4.2 The profile approach - different multi carrier modes 4.2.1 Profile definition To cope with different design constraints that arise from the possible use scenarios of the IPL-MC, it has
38、been decided within SES SDR to define different profiles. The main target frequency bands and channel bandwidths are: Profile name IPL-MC-A IPL-MC-B IPL-MC-C IPL-MC-D Typical use S-Band DVB-T S-Band SDR L-Band SDR S-Band SDR Supported modes 1 2 3 and 4 3 and 4 Carrier frequency 2,0 GHz to 2,3 GHz 2,
39、0 GHz to 2,3 GHz 1,4 GHz to 1,5 GHz 2,0 GHz to 2,3 GHz Channel bandwidth 4,76 MHz 4,76 MHz 1,536 MHz 1,536 MHz Channel spacing 5 MHz 5 MHz 1,712 MHz 1,712 MHz The present document does not restrict its use to the application scenarios as denoted above. Other frequency bands or channel bandwidths may
40、 be used but the parameter selection may not be optimal. Due to the definition of a framing adaptation layer towards the IPL of DVB-T, the complete IPL of DVB-T can be reused without any changes. However, only the 2k mode of DVB-T is considered here. ETSI ETSI TS 102 551-2 V1.1.1 (2006-12) 8 4.2.2 M
41、odes definition The different modes that are defined are as follows. Mode 1 2k5MHz pilots equal to DVB-T IPL identical to IPL of DVB-T. Parameter set inline with DVB-T 5 MHz mode (4,76 MHz bandwidth, 2k number of sub-carriers) Mode 2 2k5MHz new pilot pattern Mode optimized for requirements of freque
42、ncy bands using channel spacing of 5 MHz with 2k number of carriers. Parameter set recommended for networks with high delay spread and high vehicle speed Mode 3 1k1,7MHz new pilot pattern Mode optimized for requirements of frequency bands using channel spacing of 1,7 MHz. Parameter set recommended f
43、or networks with very high delay spread (e.g. SFN network with high power repeater), 1k number of carriers, preamble symbol, continuous and scattered pilots with pilot density of approximately 17 % Mode 4 0,5k1,7MHz new pilot pattern Similar to mode 3. Support of higher vehicle speed (carrier spacin
44、g doubled, shorter guard interval), 0,5k number of carriers While mode 1 is identical to DVB-T, the other modes use a completely new pilot pattern. The parameters for all modes are denoted in Table 1 and Table 2. 4.2.3 Parameters for QPSK subcarrier mapping The following table displays the parameter
45、s defined for the QPSK modulation of the OFDM subcarriers. Table 1: Parameters derived in modes 1 to 4 for QPSK modulation of the OFDM subcarriers unit DVB-T 2k (unchanged) SES SDR 2k (with preamble) SES SDR 1k (with preamble) SES SDR 0,5k (with preamble) Mode Identifier 1 2 3 4 FFT length 2 048 2 0
46、48 1 024 512 Used sub-carriers 1 705 1 509 729 365 Guard interval ratio 0,25 0,25 0,25 0,25 Sampling Frequency (fractional) MHz 40/7 484/75 484/225 484/225 Sampling Frequency (rounded) MHz 5,714 3 6,453 3 2,1511 2,1511 Pilots per OFDM symbol 193 262 127 64 Capacity unit size incl. RFU bits 2 056 2 0
47、64 2 064 2 064 Modulation index 2 2 2 2 Signal Bandwidth MHz 4,7573 4,754 9 1,531 4 1,533 5 Samples per symbol 2 560 2 560 1 280 640 Symbol length incl. guard interval s 448,00 396,69 595,04 297,52 Guard interval length s 89,60 79,34 119,01 59,50 sub-carrier distance in kHz kHz 2,79 3,15 2,10 4,20 D
48、ata sub-carriers per symbol 1 512 1 247 602 301 OFDM Symbols per Phy section 68 24 24 24 Data sub-carriers per Phy section 102 816 29 928 14 448 7 224 Bit per Phy section 205 632 59 856 28 896 14 448 CU per Phy section 100 29 14 7 Length of Phy section ms 30,46 9,52 14,28 7,14 Padding bits 32 0 0 0
49、preamble per IPL-MC frame 0 1 1 1 Phy sections per IPL-MC frame 4 5 5 5 sub-carrier per IPL-MC frame 411 264 150 887 72 842 36 421 Bit per IPL-MC frame 822 528 301 774 145 684 72 842 Length of IPL-MC frame ms 121,86 48,00 72,00 36,00 CU per IPL-MC frame 400 145 70 35 Padding bits (informative only) 128 0 0 0 ETSI ETSI TS 102 551-2 V1.1.1 (2006-12) 9 4.2.4 Parameters for 16QAM subcarrier mapping The following table displays the parameters defined for the 16QAM modulation of the OFDM subcarriers. Table 2: Parameters derived in
