Analysis of the use of CSK for future GNSS signals (797922), страница 8
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2, Summer 2006, pp.85-96.[25] F. Bastide, “Analysis of the Feasibility and Interestsof Galileo E5a/E5b and GPS L5 for Use with CivilAviation”,Dissertation,InstitutNationalPolytechnique de Toulouse, 2004.[26] O. Julien, "Design of Galileo L1F Receiver TrackingLoops", PhD Thesis, Department of GeomaticsEngineering, University of Calgary, Canada, July2005.[27] C. Hegarty, C. (1999), “Evaluation of the ProposedSignal Structure for the New Civil GPS Signal at1176.45 MHz”, WN99W0000034, The MITRECorporation.Table XI: CSK modulated Signals with the same useful bit rate as a BPSK referencesignal. The codewords contain 600 invariant bits.ReferenceBPSK Symbol Duration(U,N)Codeword DurationC/N0 required at the data componentin order to obtain a BER= 10-5BPSK symbolCodeworddurationDurationC/N0 required at the data componentin order to obtain a BER= 10-51 ms(500bps)4 ms(125bps)10 ms(50bps)20 ms(25bps)Map.
BCDBICM-ID(12,12)(6,6)1.2s1.2s29.75 dB-Hz 29.45 dB-Hz(12,12)(6,6)4.8s4.8s23.75 dB-Hz 23.45 dB-Hz(12,12)(6,6)12s12s19.75dB-Hz 19.45 dB-Hz(12,12)(6,6)24s24s16.75dB-Hz 16.45 dB-HzOptimal Reed SolomonRS(127,91) – 637bits(7,7)1.28s29.7 dB-Hz(7,7)5.1s23.7 dB-Hz(7,7)12.75s19.7 dB-Hz(7,7)25.5s16.7 dB-HzBPSKLDPC (1200, 600)(1,1)1.2s29.1 dB-Hz(1,1)4.8s23.1 dB-Hz(1,1)12s19.1 dB-Hz(1,1)24s16.1 dB-Hz4 ms (125 bps)10 ms (50 bps)Reference BPSK Symbol Duration1 ms (500 bps)Table XII: CSK modulated signals with increased useful bit rate with respect a BPSK reference signal but keeping the original symbol rate. Thecodewords contain 600 invariant bits.Useful Data Rate (bps)250500100020005000(8,4)(8,2)(10,1)600ms300ms120msCD32.8 dB-Hz35.8 dB-Hz39.8 dB-HzMap.
B(8, 4)(8,2)(10,1)600ms300ms120msBICM-ID32.45 dB-Hz35.45 dB-Hz39.45 dB-Hz*No 1)*No 1)(8,2)(8,1)RS(255,63)510ms255ms504 bits34.8 dB-Hz37.8 dB-Hz***No 3)Reed Solomon(8,4)(8,2)RS(255,127)1.02s510ms1016b32.8 dB-Hz35.8 dB-Hz(12,6)(12,3)(8,1)2.4s1.2s600msCD26.8 dB-Hz29.8 dB-Hz32.8 dB-HzMap. B(6,3)(8,2)(8,1)2.4s1.2s600msBICM-ID26.45 dB-Hz29.45dB-Hz32.45 dB-Hz**No 2)**No 2)(8,2)(8,1)RS(255,63)2.04s1.02s***No 3)504 bits28.8 dB-Hz31.8 dB-HzReed Solomon(8,4)(8,2)(8,1)RS(255,127)4.08s2.04s1.02s1016 bits26.8 dBHz29.8 dB-Hz32.8 dB-Hz(10,2)(10,1)2.4s1.2sCD26.75 dB-Hz29.75 dB-HzMap. B(5,1)(10,1)**No 2)**No 2)**No 2)2.4s1.2sBICM-ID26.5 dB-Hz29.45 dB-Hz***No 3)20 ms (25 bps)Reed SolomonCDMap.
BBICM-IDReed Solomon(10,1)2.4s26.75 dB-Hz(10,1)2.4s26.45 dB-Hz***No 3)***No 3)***No 3)***No 3)**No 2)2ms2.4s1ms1.2s0.5ms600ms0.25ms300ms26.1 dB-Hz29.1 dB-Hz32.1 dB-Hz35.1 dB-Hz*No 1) The desired Rb requires a slower reference BPSK symbol period**No 2) Impossible to reach the desired Rb with the reference BPSK symbol period and.***No 3) Impossible to reach the desired Rb with the reference BPSK symbol period,and RS codeword information bits.Equivalent BPSK with LDPC (1200, 600)***No 3)0.1ms120ms39.1 dB-Hz(U,N) and k if necessaryCodeword DurationC/N0 required at the data componentin order to obtain a BER= 10-5BPSK symbolCodeworddurationDurationC/N0 required at the data componentin order to obtain a BER= 10-5ReferenceBPSK Symbol DurationTable XIII: CSK modulated Signals with the same useful bit rate as a BPSKreference signal. The codewords contain 600 or more variant bits.1 ms(500bps)4 ms(125bps)10 ms(50bps)20 ms(25bps)Map.
ACDBICM-ID(12,12)(6,6)14.4s7.2s29.1 dB-Hz 28.45 dB-Hz(6,6)(6,6)28.8s28.8s23.3 dB-Hz 22.45 dB-Hz(2,2)(2,2)28.s28s20.5 dBHz--****No 4)****No 4)Optimal Reed SolomonBPSK LDPC(1200, 600)(10,10) – k=799015.98s28.6 dB-Hz(8,8) – k=1528 (9,9) – k=351912.21s28.2s23.2 dB-Hz22.8 dB-Hz(7,7) – k=637(8,8) – k=15285.23s30.55s19.7 dB-Hz19.2 dB-Hz(6,6) – k=270(7,7) – k=63710.46s25.50s23.35 dB-Hz16.7 dB-Hz(1,1)1.2s29.1 dB-Hz(1,1)4.8s23.1 dB-Hz(1,1)12s19.1 dB-Hz(1,1)24s16.1 dB-Hz4 ms (125 bps)10 ms (50 bps)20 ms (25 bps)Reference BPSK Symbol Duration1 ms (500 bps)Table XIV: CSK modulated signals with increased useful bit rate with respect a BPSK reference signal but keeping the original symbol rate. Thecodewords contain 600 or more variant bits.Useful Data Rate (bps)250500100020005000(8,4)(8,2)(10,1)4.8s2.4s1.2sCD32.3 dB-Hz35.3 dB-Hz39.2 dB-HzMap.
A(6,3)(8,2)(10,1)3.6s2.4s1.2sBICM-ID*No 1)*No 1)31.45 dB-Hz34.4 dB-Hz38.4 dB-Hz(10,5) – k=5110(8,2) – k=1016(10,1) – k=5110Reed Solomon5.115s510ms1.023sU=10b - RS(1023,511) orU=8b - RS(255,123)32.3 dB-Hz35.6 dB-Hz39.3 dB-Hz(6,3)(12,3)(8,1)14.4s14.4s4.8sCD26.4 dB-Hz29.1 dB-Hz32.25 dB-HzMap. A(6,3)(8,2)(8,1)14.4s9.6s4.8sBICM-ID**No 2)**No 2)25.45 dB-Hz28.45 dB-Hz31.45 dB-Hz(8,4) – k=1016(8,2) – k=1016(8,1) – k=1016Reed Solomon4.08s2.04s1.02sU=8b - RS(255,123)26.8 dB-Hz29.8 dB-Hz32.8 dB-Hz(10,2)(10,1)24s12sCD26.2 dB-Hz29.2 dB-HzMap. A(5,1)(10,2)12s12s**No 2)**No 2)**No 2)BICM-ID25.55 dB-Hz28.4 dB-Hz(5,1) – k=75(10,1) – k=5110Reed Solomon310ms10.23sU=10b - RS(1023,511) orU=5b - RS(31,15)28.6 dB-Hz29.2 dB-Hz(10,1)24sCD26.2 dB-HzMap.
A(10,1)24sBICM-ID***No 3)***No 3)***No 3)***No 3)25.4 dB-Hz(10,1) – k = 5110Reed Solomon20.46sU=10b - RS(1023,511)26.3 dB-Hz2ms2.4s1ms1.2s0.5ms600ms0.25ms300ms0.1ms120msEquivalent BPSK with LDPC (1200, 600)26.1 dB-Hz29.1 dB-Hz32.1 dB-Hz35.1 dB-Hz39.1 dB-Hz*No 1) The desired Rb requires a slower reference BPSK symbol period**No 2) Impossible to reach the desired Rb with the reference BPSK symbol period and.***No 3) Configuration not interesting from the codeword duration / demodulation performance point of view.****No 4) Codeword duration exceeds the imposed maximum duration..
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