1、 ETSI TS 102 188-4 V1.1.2 (2004-07)Technical Specification Satellite Earth Stations and Systems (SES);Regenerative Satellite Mesh - A (RSM-A) air interface;Physical layer specification;Part 4: ModulationETSI ETSI TS 102 188-4 V1.1.2 (2004-07) 2 Reference RTS/SES-00206-4 Keywords air interface, broad
2、band, IP, multimedia, 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 copi
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6、restriction extend to reproduction in all media. European Telecommunications Standards Institute 2004. All rights reserved. DECTTM, PLUGTESTSTM and UMTSTM are Trade Marks of ETSI registered for the benefit of its Members. TIPHONTMand the TIPHON logo are Trade Marks currently being registered by ETSI
7、 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 102 188-4 V1.1.2 (2004-07) 3 Contents Intellectual Property Rights4 Foreword.4 1 Scope 5 2 References 5 3 Definitions and abbreviations.5 3.
8、1 Definitions5 3.2 Abbreviations .5 4 General .6 5 Uplink.6 5.1 Symbol rates and periods .7 5.2 Signalling constellation 7 5.3 Pulse shaping8 6 Downlink8 6.1 Symbol rates and periods .8 6.2 Signalling constellation 9 6.3 Pulse shaping10 6.3.1 PTP slots .10 6.3.2 Shaped-broadcast and idle slots10 Ann
9、ex A (informative): Bibliography.11 History 12 ETSI ETSI TS 102 188-4 V1.1.2 (2004-07) 4 Intellectual Property Rights IPRs essential or potentially essential to the present document may have been declared to ETSI. The information pertaining to these essential IPRs, if any, is publicly available for
10、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 respect of ETSI standards“, which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web server (http:/
11、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 the 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 b
12、ecome, essential to the present document. Foreword This Technical Specification (TS) has been produced by ETSI Technical Committee Satellite Earth Stations and Systems (SES). The present document is part 4 of a multi-part deliverable covering the BSM Regenerative Satellite Mesh - A (RSM-A) air inter
13、face; Physical layer specification, as identified below: Part 1: “General description“; Part 2: “Frame structure“; Part 3: “Channel coding“; Part 4: “Modulation“; Part 5: “Radio transmission and reception“; Part 6: “Radio link control“; Part 7: “Synchronization“. ETSI ETSI TS 102 188-4 V1.1.2 (2004-
14、07) 5 1 Scope The present document defines the modulation used within the SES BSM Regenerative Satellite Mesh - A (RSM-A) air interface family. It includes the various modulation formats that are required for different physical channel types. It also defines the concept of the transmission burst and
15、 the mapping of modulated symbols to the burst, and describes the required transmit filtering in general terms. 2 References Void. 3 Definitions and abbreviations 3.1 Definitions For the purposes of the present document, the following terms and definitions apply: Network Operations Control Centre (N
16、OCC): centre that controls the access of the satellite terminal to an IP network and also provides element management functions and control of the address resolution and resource management functionality satellite payload: part of the satellite that provides air interface functions NOTE: The satelli
17、te payload operates as a packet switch that provides direct unicast and multicast communication between STs at the link layer. Satellite Terminal (ST): terminal installed in the user premises terrestrial host: entity on which application level programs are running NOTE: It may be connected directly
18、to the Satellite Terminal or through one or more networks. 3.2 Abbreviations For the purposes of the present document, the following abbreviations apply: IP Internet Protocol kbps kilo bits per second (thousands of bits per second) Mbps Mega bits per second (millions of bits per second) NOCC Network
19、 Operations Control Centre NRZ Non Return to Zero OQPSK Offset Quaternary Phase Shift Keying PSK Phase Shift Keying PTP Point-To-Point QPSK Quaternary Phase Shift Keying RSM Regenerative Satellite Mesh ST Satellite Terminal ETSI ETSI TS 102 188-4 V1.1.2 (2004-07) 6 4 General The functions of the phy
20、sical layer are different for the uplink and downlink. The major functions are illustrated in figure 4. UPLINK DOWNLINK Part 3: Channel coding Part 2: Frame structure Part 4: Modulation Part 5: Radio transmission and reception tn Part 7: Synchronization Block interleaving Inner coding (convolutional
21、) Downlink burst building Downlink modulation (QPSK) ST receiver Scrambling Assemble packets into code blocks Outer coding (Reed-Solomon) No interleaving Inner coding (hamming) Uplink burst building Uplink modulation (OQPSK) Part6:Radio linkcontrolScrambling Timing and frequency control ST transmitt
22、er Assemble packets into code blocks Outer coding (Reed-Solomon) Figure 4: Physical layer functions The present document describes the modulation functions - this group of functions is highlighted in figure 4. The uplink modulation requirements are described in clause 5, and the downlink modulation
23、requirements are described in clause 6. 5 Uplink The uplink shall use Offset Quaternary Phase Shift Keying (OQPSK) modulation with square root raised cosine pulse shaping. EncodedBitsBitstoSymbolsPulse ShapingIOQPSKOutputQZ-1ModulatorIQFigure 5: Uplink modulator block diagram ETSI ETSI TS 102 188-4
24、V1.1.2 (2004-07) 7 5.1 Symbol rates and periods The OQPSK symbol rates and corresponding symbol durations are as defined in table 5.1. Table 5.1: Symbol rates and periods Carrier mode Symbol rate, symbol/s Symbol duration, ns 128 kbps (see note)520 5/6 103 1 920 512 kbps 520 5/6 1031 920 2 Mbps 2 1/
25、12 106480 16 Mbps 16 10660 NOTE: Each symbol is repeated four times. The symbol rate is defined as: BN =610 62,5rate Symbol where B = 1,25 and N is defined below: =modecarrier Mbps 16 for the3modecarrier Mbps 2 for the24modescarrier Kbps 512 and Kbps 128 for the96NThe symbol duration is the reciproc
26、al of the symbol rate. 5.2 Signalling constellation Each uplink symbol conveys two binary units of information, one on each of the I and Q arms. In offset QPSK, the I arm data leads the Q arm data by one-half symbol. The ST I-Q constellation plane is defined as a right-hand coordinate plane as shown
27、 in figure 5.2.1. On the I-Q constellation plane, a binary 0 value bit is defined as a positive (logical high), and a binary value 1 bit is defined as a negative (logical low). QI11-1-1(0,0)(1,0)(1,1) (0,1).(I,Q)Figure 5.2.1: Uplink modulation constellation convention ETSI ETSI TS 102 188-4 V1.1.2 (
28、2004-07) 8 The ST uplink modulator phasing convention is shown in figure 5.2.2. OQPSKOutputSumIcos(t)Q-sin(t)Figure 5.2.2: Uplink modulator phasing convention 5.3 Pulse shaping Each data bit to be modulated via the I and Q data arms is shaped by the following ideal time domain (impulse response) fun
29、ction: () ()()+=2411sin)4/(1(1cos4)(tstststssthwhere 4,0= is the roll-off factor, t is the time, and s is the symbol rate. 6 Downlink The downlink modulation for the PTP mode shall be Quaternary Phase Shift Keying (QPSK) with square root raised cosine pulse shaping. The downlink modulation for the C
30、ONUS broadcast shall be NRZ QPSK. 6.1 Symbol rates and periods The downlink operates at one of three possible transmission rates the -rate, the -rate, and full-rate modes. The QPSK symbol rates and corresponding symbol durations are as defined in table 6.1. Table 6.1: Symbol rates and periods Carrie
31、r mode Symbol rate, symbol/s Symbol duration, ns -rate 100 10610 -rate 133 1067,5 Full rate 400 1062,5 ETSI ETSI TS 102 188-4 V1.1.2 (2004-07) 9 6.2 Signalling constellation Each downlink symbol conveys two coded binary units of information, one on each of the I and Q arms. The downlink I-Q constell
32、ation plane is defined as a right-hand coordinate plane as shown in figure 6.2.1. On the I-Q constellation plane, a binary 0 value bit (coded bit) is defined as a positive (logical high), and a binary value 1 bit is defined as a negative (logical low). QI11-1-1(0,0)(1,0)(1,1) (0,1).(I,Q)Figure 6.2.1
33、: Downlink modulation constellation convention The downlink modulator phasing convention is shown in figure 6.2.2. QPSKOutputSumIcos(t)Q-sin(t)Figure 6.2.2: Downlink modulator phasing convention ETSI ETSI TS 102 188-4 V1.1.2 (2004-07) 106.3 Pulse shaping 6.3.1 PTP slots Each PTP slot data bit to be
34、modulated via the I and Q data arms is shaped by the following ideal time domain (impulse response) function: () ()()+=2411sin)4/(1(1cos4)(tstststssthwhere 25,0= is the roll-off factor, t is the time, and s is the symbol rate. For PTP mode, s = 400 Mbps. A block diagram of the PTP pulse shaping is s
35、hown in figure 6.3.1. Full RatePulse ShapingIQPSKOutputQModulatorIQEncodedBitsBitstoSymbols400Msps400MspsFigure 6.3.1: PTP PSK symbol shaping 6.3.2 Shaped-broadcast and idle slots Each symbol is repeated three times (or four times in the case of the -rate) as illustrated in figure 6.3.2, before pass
36、ing the data through the pulse-shaping filter that is used for the full-rate PTP slots as described in clause 6.3.1. RepeatSymbolFull RatePulse ShapingIQPSKOutputQModulatorIQEncodedBitsBitstoSymbols400Msps400Msps133 1/3 or 100MspsFigure 6.3.2: Shaped-broadcast and idle PSK symbol shaping ETSI ETSI T
37、S 102 188-4 V1.1.2 (2004-07) 11Annex A (informative): Bibliography ETSI TR 101 984: “Satellite Earth Stations and Systems (SES); Broadband Satellite Multimedia; Services and Architectures“. ETSI TS 102 188-1: “Satellite Earth Stations and Systems (SES); RSM-A Air Interface; Physical Layer specificat
38、ion; Part 1: General description“. ETSI TS 102 188-2: “Satellite Earth Stations and Systems (SES); RSM-A Air Interface; Physical Layer specification; Part 2: Frame structure“. ETSI TS 102 188-3: “Satellite Earth Stations and Systems (SES); RSM-A Air Interface; Physical Layer specification; Part 3: C
39、hannel coding“. ETSI TS 102 188-5: “Satellite Earth Stations and Systems (SES); RSM-A Air Interface; Physical Layer specification; Part 5: Radio transmission and reception“. ETSI TS 102 188-6: “Satellite Earth Stations and Systems (SES); RSM-A Air Interface; Physical Layer specification; Part 6: Radio link control“. ETSI TS 102 188-7: “Satellite Earth Stations and Systems (SES); RSM-A Air Interface Physical Layer specification; Part 7: Synchronization“. ETSI ETSI TS 102 188-4 V1.1.2 (2004-07) 12History Document history V1.1.1 March 2004 Publication V1.1.2 July 2004 Publication
