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電子航法研究所研究発表会(第16回平成28年6月)
̍̕ɽLDACS1 ͷϏοτ‫ޡ‬Γ཰ಛੑͷվળ
‫ࢹ؂‬௨৴ྖҬ
1
͸͡Ίʹ
ද1
ࠃࡍຽؒߤۭ‫ؔػ‬͸ɼACARSʢAircraft Com-
LDACS1 ओཁॾ‫ݩ‬
࢖༻प೾਺ଳ
ෳ৴ํࣜ
ΞΫηεํࣜ
มௐํࣜ
νϟωϧ෯
Ϗοτ఻ૹ଎౓
֎ූ߸
‫ޡ‬Γగਖ਼
಺ූ߸
FFT αΠζ
αϯϓϦϯά࣌ؒ
OFDM γϯϘϧ௕
αϒΩϟϦΞ਺
αϒΩϟϦΞִؒ
munications Addressing and Reporting Systemʣ΍
VDLʢVHF Digital LinkʣMode2 ʹ୅ΘΔ཮Ҭʹ
͓͚Δকདྷͷۭ஍ߴ଎σʔλ௨৴γεςϜͱ͠
ͯ LDACSʢL-band Digital Aeronautical Commu-
nications SystemʣΛఏҊ͍ͯ͠Δ [1]ɻLDACS
͸ L όϯυʢ1GHz ଳʣΛ࢖༻͢ΔγεςϜ‫֨ن‬
ҊͰ͋Δɻࠃࡍ‫֨ن‬ͷࡦఆʹ౰ͬͯ͸ɼLDACS
ͷ௨৴ੑೳΛ໌Β͔ʹ͢Δͱͱ΋ʹଞͷ ARNS
ʢAeronautical Radio Navigation Serviceʣγες
Ϝͱͷ‫༻ڞ‬໰୊ͳͲΛղܾ͍ͯ͘͠ඞཁ͕͋
˞๺ંɹ५ɼԘ‫֨ ݟ‬Ұ
960—1164[MHz]
प೾਺෼ׂ
OFDMA
4/16/64QAM+OFDM
498.05[kHz] x 2
833.33—2500.0[kbps]
ϦʔυιϩϞϯ
ʢύϯΫνϟυʣ৞ΈࠐΈ
64
1.6[μs]
120[μs]
50
9.765625[kHz]
Δɻͳ͓ɼLDACS ‫֨ن‬Ҋʹ͸‫ ࡏݱ‬LDACS1 [2]ɼ
LDACS2 [3] ͷ 2 छྨ͕ఏҊ͞Ε͓ͯΓɼ྆ऀ
ʹ‫׵ޓ‬ੑ͸ͳ͍ɻLDACS1 ͸ LDACS2 ʹൺ΂ͯ
Ϗοτ఻ૹϨʔτ͕ߴ͘ɼϏοτ‫ޡ‬Γగਖ਼ೳྗ͕
ߴ͍౳ͷಛ௃͔Βɼ‫Ͱ఺࣌ݱ‬͸ LDACS1 ͕ੑೳ
্༏Ґͱ‫ݟ‬ΒΕ͍ͯΔ͕ɼຊ֨తͳࠃࡍ‫֨ن‬Խ
ʹ͸ࠓ͠͹Β͕͔͔࣌ؒ͘Δ΋ͷͱߟ͑ΒΕͯ
͍Δɻ
ਤ 1 LDACS1 εʔύϑϨʔϜߏ੒ [2]
͜Ε·Ͱɼిࢠߤ๏‫Ͱॴڀݚ‬͸ LPESʢLDACS
Physical layer Experimental System; LDACS ෺ཧ
૚࣮‫ݧ‬γεςϜʣΛ࡞੒͠ [4]ɼLDACS1 ͷ෺ཧ
૚ੑೳʹ͍ͭͯ‫[ ͖ͨͯ͠ূݕ‬5–7]ɻͦͷ݁Ռɼ
LDACS1 ͷ‫ޡ‬Γగਖ਼ద༻‫ޙ‬ͷ BERʢBit Error
Rate; Ϗοτ‫ޡ‬Γ཰ʣಛੑ͕ AWGNʢAdditive
White Gaussian Noise; Ճ๏ੑന৭Ψ΢εࡶԻʣ
఻ૹ࿏ʹൺ΂ϚϧνύεϑΣʔδϯά‫ڥ؀‬ԼͰ
͍ΔɻFL ͸஍্‫͔ہ‬Β OFDM ৴߸Λ࿈ଓૹ৴
͠ɼ֤ߤۭ‫ʹہػ‬ରͯ͠‫ݸ‬ผࢦఆ·ͨ͸ಉ࣌௨ใ
ͷ఻ૹ͕ߦ͑ΔɻҰํɼRL ͸஍্‫͔ہ‬Βͷཁ‫ٻ‬
ʹԠׂͯ͡Γ౰ͯΒΕ֤ͨߤۭ‫͕ہػ‬όʔετ
ঢ়ʹૹ৴͢Δɻ
ʢReverse Linkʣ͸஍্‫޲ํہػۭߤ → ہ‬ͷ FL
LDACS1 ͷओཁॾ‫ݩ‬Λද 1 ʹɼLDACS1 ͷૹ
৴ϑΥʔϚοτΛਤ 1 ʹࣔ͢ɻૹ৴ϑΥʔϚο
τ͸ɼ௕͞ 240 ms ͷεʔύϑϨʔϜ಺ʹσʔ
ʢForward Linkʣʹൺ΂ͯ BER ྼԽ͕େ͖͍͜
λ΍੍‫༻ޚ‬౳ͷ֤छϑϨʔϜΛ֨ೲ͍ͯ͠Δɻ
ͱɼ͕֬ೝ͞Ε͍ͯΔ [8,9]ɻຊߘͰ͸ɼLDACS1
ά‫هͱڥ؀‬ड़͢ΔʣԼͰͷ BER ಛੑͷվળࡦͱ
OFDM ೋ࣍มௐͰ͸ 50 ຊͷαϒΩϟϦΞΛα
Πζ 64 ͷ FFTʢFast Fourier TransformʣͰ࣌ؒ৴
߸ʹม‫͢׵‬ΔɻOFDM Ͱνϟωϧਪఆʹ࢖༻͢
ΔύΠϩοτ৴߸഑ஔ͸ɼFL ‫ ͼٴ‬RL ͷϑϨʔ
ͦͷద༻݁Ռʹ͍ͭͯใࠂ͢Δɻ
ϜͷछྨʹԠܾͯ͡ΊΒΕ͍ͯΔɻϢʔβσʔ
2
λ఻ૹʹ༻͍Δ FL σʔλϑϨʔϜͱ RL σʔλ
ྼԽ͢Δ͜ͱɼಛʹߤۭ‫ → ہػ‬஍্‫޲ํہ‬ͷ RL
ड৴‫ػ‬ଆͰͷ৴߸ॲཧΛ‫ݟ‬௚͢͜ͱʹΑΔɼϚϧ
νύεϑΣʔδϯά‫ڥ؀‬ʢҎԼɼ୯ʹϑΣʔδϯ
LDACS1 ֓ཁ
LDACS1 ͸ OFDMʢOrthogonal Frequency Division MultiplexʣΛϕʔεͱͨ͠γεςϜͰɼFL
ͱ RL ͱͰҟͳΔप೾਺νϟωϧΛׂΓ౰ͯͯ
ϑϨʔϜͷύΠϩοτ৴߸഑ஔΛɼਤ 2 ʹࣔ͢ɻ
ͳ͓ɼFL σʔλϑϨʔϜ͸ 52 OFDM γϯϘϧ
௕Ͱ͋ΔҰํͰɼRL σʔλϑϨʔϜ͸ 6 OFDM
─ 108 ─
電子航法研究所研究発表会(第16回平成28年6月)
LDACS1 BER performances (TM, FEC)
Bit Error Rate
10
0
10
-1
10
-2
10
-3
10
-4
10
-5
10-6
10-7
FL
RL
4
6
ਤ 2 ύΠϩοτ৴߸഑ஔྫ
8
10
12
C/N [dB]
14
16
18
20
ਤ 3 TM ‫ڥ؀‬Լ BER ಛੑྫ
ද 2 ϑΣʔδϯάγφϦΦઃఆ
ENR
TM
APT
Rice ϑΣʔδϯάʢK ϑΝΫλ 15dBʣ
௚઀೾ͱ 2 ஗Ԇ೾ʢ0.3μsɼ15μsʣ
Ҡಈମ଎౓ʢ600knotʣ
Rice ϑΣʔδϯάʢK ϑΝΫλ 10dBʣ
υοϓϥϞσϧʢJakesʣ
Ҡಈମ଎౓ʢ300knotʣ
Rayleigh ϑΣʔδϯά
υοϓϥϞσϧʢJakesʣ
Ҡಈମ଎౓ʢ200knotʣ
BER ͕‫ݮ‬গ͢ΔҰํɼRL σʔλϑϨʔϜͰ͸
BER ͕΄΅มΘΒͣશ͘‫ޡ‬Γగਖ਼͕ޮ͔ͳ͍ঢ়
ଶͰ͋ͬͨɻ
3.1
ϑΣʔδϯά‫ڥ؀‬ԼͰ͋ͬͯ΋ɼ௨৴νϟω
ϧঢ়ଶΛਖ਼֬ʹਪఆ͠౳ԽͰ͖Ε͹Ϗοτ‫ޡ‬Γ
͸‫ݮ‬গ͢ΔɻҰൠతʹ OFDM γεςϜͰ͸ύ
γϯϘϧ௕Ͱ͋Δɻਤ 2 Ͱ͸࿈ଓ͢Δ RL σʔ
λϑϨʔϜΛॎʹ 8 ͭฒ΂ͯද͍ࣔͯ͠Δɻ
3
վળࡦ
Πϩοτ৴߸͕ϑϨʔϜʹ഑ஔ͞Ε͓ͯΓɼύ
Πϩοτ৴߸Ґஔͷਪఆνϟωϧঢ়ଶ͔Βิ
ؒɾิ֎‫ʹࢉܭ‬Α֤ͬͯσʔλ৴߸Λ౳Խ͢Δɻ
ϑ Σ ʔ δ ϯ ά ‫ ڥ ؀‬Լ ͷ LDACS1
BER ಛੑ
ϚϧνύεʹΑΔϑΣʔδϯά‫ڥ؀‬͸ɼҰൠʹ
LPES ͷॳ‫Ͱ૷࣮ظ‬͸ɼ൑ఆ‫ܕؐؼ‬ͷ౳Խ‫ث‬Λ࣮
૷ͨ͠ɻ
஗ԆϓϩϑΝΠϧʹΑͬͯϞσϧԽ͞ΕΔɻߤ
LDACS1 ͷ RL σʔλϑϨʔϜ͸ਤ 2 ʹࣔ͠
ͨ௨Γɼಛఆͷ OFDM γϯϘϧͷΈʹύΠϩο
ۭ‫ػ‬ͷඈߦঢ়‫ͼٴگ‬पғঢ়‫گ‬͸ଟ‫ʹذ‬ΘͨΔͨ
τ৴߸͕഑ஔ͞Ε͍ͯΔɻ͜ͷͨΊɼ൑ఆ‫ؐؼ‬
ΊɼϞσϧΛҰҙʹܾఆ͸Ͱ͖ͳ͍͕ɼ୅දత
‫Ͱܕ‬͸࣌ؒมԽ΁ͷ௥ै͕ෆे෼Ͱ͋Δͱߟ͑ɼ
ͳϑΣʔδϯά‫͔͍͕ͭ͘ྫڥ؀‬ఆٛ͞Ε͍ͯ
࣌ؒํ޲΋ิؒ‫͢ࢉܭ‬Δ౳Խ‫ث‬Λผ్࣮૷ͨ͠ɻ
Δ [2, 10]ɻຊ‫Ͱڀݚ‬͸ɼจ‫[ ݙ‬2] ෇࿥ A ʹ͋Δ 3
ຊߘͰ͸ศ্ٓɼ಺ૠ‫ܕ‬౳Խ‫Ϳݺͱث‬ɻ͞Βʹ
छྨͷγφϦΦ ENRɼTMɼAPT Λࢀߟʹͯ͠ɼ
ਪఆ࣌ʹ఻ૹ࿏ಛੑߦྻ H Λ༻͍Δ͔ͦͷ‫ߦٯ‬
ද 2 ͷΑ͏ʹϑΣʔδϯάγφϦΦΛઃఆͨ͠ɻ
ྻ H −1 Λ༻͍Δ͔ͱ͍͏ཁૉ΋Ճ͑ɼ౳Խ‫ʹث‬
͜ΕΒͷγφϦΦΛϑΣʔδϯάγϛϡϨʔλ
ΑΔ RL σʔλϑϨʔϜ BER ಛੑͷվળΛࢼΈ
Ͱ໛ٖ͢Δ͜ͱʹΑͬͯɼϑΣʔδϯά‫ʹڥ؀‬
ͨɻද 3 ʹ࣮૷ͨ͠౳Խ‫ث‬ҰཡΛࣔ͢ɻಉදதɼ
͓͚Δ LDACS1 ͷ BER ಛੑΛऔಘͨ͠ [8, 9]ɻ
ઢ‫҈ܗ‬෼ͱ͸ 2 ͭͷෳૉ਺ͷ୯७ͳ಺෼ൺͰิ
ͳ͓ ENRɼTMɼAPT ͸ɼͦΕͧΕΤϯϧʔτ
ؒ‫͢ࢉܭ‬Δํ๏ɼҐ૬҈෼ͱ͸ 2 ͭͷෳૉ਺ؒ
‫ڥ؀‬ɼλʔϛφϧۭҬ‫ڥ؀‬ɼۭߓ໘‫ڥ؀‬Λҙຯ
ͷҐ૬ࠩͷ಺෼ൺͱ֤ৼ෯ͷର਺ͷ಺෼ൺ͔Β
͢Δɻ
ิؒ‫͢ࢉܭ‬Δํ๏Λද͢ɻ
ਤ 3 ʹɼLPES ॳ‫Ͱ૷࣮ظ‬ͷ TM ʹ͓͚Δ FL
·ͨɼRL σʔλϑϨʔϜͷσʔλ௕‫ޡͼٴ‬Γ
σʔλϑϨʔϜ‫ ͼٴ‬RL σʔλϑϨʔϜͷ‫ޡ‬Γ
గਖ਼ූ߸௕Λ LDACS1 ‫ͱ֨ن‬ಉҰͱ্ͨ͠Ͱɼ
గਖ਼ద༻‫ ޙ‬BER ಛੑΛࣔ͢ɻॳ‫Ͱ૷࣮ظ‬͸ɼFL
ύΠϩοτ৴߸ͷ഑ஔύλʔϯΛਤ 4 ͷΑ͏ʹ
σʔλϑϨʔϜ͕ C/N ͕େ͖͘ͳΔʹͭΕͯ
ஔ͖‫ͨ͑׵‬৔߹ʹ BER ͷվળޮՌ͕͋Δ͔ʹͭ
─ 109 ─
電子航法研究所研究発表会(第16回平成28年6月)
ද3
౳Խ‫ث‬൪߸
1
2
3
4
5
6
7
8
࣮૷౳Խ‫ث‬Ұཡ
౳Խํࣜ
൑ఆ‫ܕؐؼ‬ɼθϩϑΥʔγϯά
಺ૠ‫ܕ‬ɼθϩϑΥʔγϯά
಺ૠ‫ܕ‬ɼθϩϑΥʔγϯά
಺ૠ‫ܕ‬ɼθϩϑΥʔγϯά
൑ఆ‫ܕؐؼ‬ɼθϩϑΥʔγϯά
൑ఆ‫ܕؐؼ‬ɼ࠷খฏ‫ۉ‬ೋ৐‫ࠩޡ‬
಺ૠ‫ܕ‬ɼ࠷খฏ‫ۉ‬ೋ৐‫ࠩޡ‬
൑ఆ‫ܕؐؼ‬ɼ࠷খฏ‫ۉ‬ೋ৐‫ࠩޡ‬
ิؒ‫ࢉܭ‬
ઢ‫҈ܗ‬෼
ઢ‫҈ܗ‬෼
ઢ‫҈ܗ‬෼
Ґ૬҈෼
Ґ૬҈෼
Ґ૬҈෼
Ґ૬҈෼
Ґ૬҈෼
ΦϦδφϧύλʔϯ
ิؒର৅ߦྻ
H −1
H
H
H
H −1
H −1
H
H
LDACS1 BER performances (TM, FEC)
10
0
10-1
Bit Error Rate
ύλʔϯ 1
ύλʔϯ 2
10
-2
10
-3
10-4
10-5
10-6
ύλʔϯ 3
10
4
6
8
10
12
C/N [dB]
14
16
18
20
ਤ 5 TM ‫ڥ؀‬Լ BER ಛੑվળ݁Ռ
ਤ 4 RL σʔλϑϨʔϜύΠϩοτ৴߸഑ஔ
ύλʔϯ
Μ΂Μͳ͘෼ࢄ͢ΔεΩϟολυύΠϩοτͱ
͍ͯ΋࣮ࢪͨ͠ɻ
3.2
FL
RL
RL improved
-7
ͨͨ͠Ίɼ֤ OFDM γϯϘϧ಺ͷิؒਫ਼౓͸Լ
ద༻݁Ռ
͕Δ΋ͷͷγϯϘϧຖʹνϟωϧਪఆঢ়ଶ͕ߋ
౳Խ‫ ث‬8 छͱύΠϩοτ഑ஔύλʔϯ 3 छͷ
૊Έ߹ΘͤΛࢼͨ݁͠ՌɼRL σʔλϑϨʔϜͷ
BER ಛੑվળʹ࠷΋ޮՌ͕ߴ͔ͬͨํ๏͸ɼ౳
Խ‫ ث‬8 ൪ͱύλʔϯ 3 ͷ૊Έ߹ΘͤͰ͋ͬͨɻ
ਤ 5ɼਤ 6 ʹ TM ‫ ͼٴڥ؀‬ENR ‫͚͓ʹڥ؀‬Δ
BER ಛੑվળ݁ՌΛࣔ͢ɻ͍ͣΕ΋ɼFL σʔλ
ϑϨʔϜʹ͍ۙ BER ಛੑ·Ͱվળ͞Εͨɻ
৽͞ΕɼFL σʔλϑϨʔϜʹ͍ۙಛੑ͕ಘΒΕ
ͨͱߟ͑ΒΕΔɻ
ͳ͓ɼ಺ૠ‫ܕ‬౳Խ‫ث‬͸ΦϦδφϧύλʔϯʹ͸
Ұఆͷ BER վળޮՌ͕‫ݟ‬ΒΕͨ΋ͷͷɼύλʔ
ϯ 1ɼ2ɼ3 Ͱ͸൑ఆ‫Ͳ΄ܕؐؼ‬ͷվળޮՌ͸ಘΒ
Εͳ͔ͬͨɻ͜Ε͸ɼΦϦδφϧύλʔϯҎ֎Ͱ
͸࣌ؒํ޲ʹิ֎‫ࢉܭ‬Λߦ͏͜ͱʹͳΔͨΊɼ‫ܭ‬
ΦϦδφϧύλʔϯͰ͸ɼͲͷαϒΩϟϦΞ
ࢉ݁Ռ͕ద੾ͳൣғ֎ͱͳΔ͜ͱ΋͋Γνϟω
ʹ΋ύΠϩοτ৴߸͕ͳ͍ OFDM γϯϘϧ͕
ϧਪఆ݁Ռ͕ෆਖ਼֬ʹͳͬͨ΋ͷͱߟ͑ΒΕΔɻ
4 ͭ࿈ଓ͍ͯ͠Δɻຊߘͷ൑ఆ‫ܕؐؼ‬౳Խ‫ث‬͸
OFDM γϯϘϧ಺ͷύΠϩοτ৴߸Λ࢖ͬͯ 1
ҰํɼAPT ‫͍͓ͯʹڥ؀‬΋౳Խ‫ ث‬8 ൪ͱύ
γϯϘϧલͷνϟωϧਪఆঢ়ଶΛߋ৽͍ͯ͘͠
λʔϯ 3 ͷ૊Έ߹ΘͤͰ RL σʔλϑϨʔϜͷ
௿‫͍͘ʹ͖ͭͼ݁ʹݮ‬ɻ͜Εʹରͯ͠ɼύλʔϯ
BER ಛੑ͸ FL σʔλϑϨʔϜฒʹͳͬͨɻ͠
͔͠ਤ 7 ʹࣔ͢Α͏ʹɼC/N = 20[dB] Ͱͷ‫ޡ‬Γ
గਖ਼ద༻‫ ޙ‬BER ͕ 10−2 ఔ౓Ͱ͋ͬͨɻAPT ‫؀‬
‫Ͱڥ‬͸ Jakes Ϟσϧͷ Rayleigh ϑΣʔδϯάΛ
Ծఆ͓ͯ͠Γɼਤ 7 ͸ BER ಛੑʹͱͬͯϫʔε
3 Ͱ͸֤ OFDM γϯϘϧʹύΠϩοτ৴߸Λ·
τέʔεͱͳΔͱࢥΘΕΔɻͳ͓࣮ࡍͷۭߓ໘
ͨΊɼύΠϩοτ৴߸͕ͳ͍৔߹͸νϟωϧਪఆ
ঢ়ଶͷߋ৽͕‫͜ى‬Βͳ͍ɻͭ·Γ‫͍ݹ‬νϟωϧ
ਪఆঢ়ଶͷ··౳Խ͢Δ͜ͱ͔ΒɼϏοτ‫ޡ‬Γͷ
─ 110 ─
電子航法研究所研究発表会(第16回平成28年6月)
ϨʔϜʹ͓͚Δ BER ಛੑͷվળࡦʹ͍ͭͯ‫ূݕ‬
LDACS1 BER performances (ENR, FEC)
0
10
ͨ͠ɻ౳Խํࣜࣗମ͸൑ఆ‫ܕؐؼ‬Λ࢖͏΋ͷͷ
-1
10
ύΠϩοτ৴߸഑ஔΛεΩϟολυύΠϩοτ
-2
ͱͨ͠৔߹ʹɼFL σʔλϑϨʔϜఔ౓·Ͱ BER
-3
ಛੑΛվળͰ͖Δͱ൑໌ͨ͠ɻ
Bit Error Rate
10
10
-4
10
ࢀߟจ‫ݙ‬
-5
10
‫ͳͱگ‬Γɼۭߓ໘ʹ͓͍ͯ΋ BER ͸ਤ 7 ͷ݁Ռ
[1] Nicolaos Fistas, Brent Phillips, and James
Budinger. Future communications study —
action plan 17, final conclusions and recommendations report. In 26th DASC, pp. 1–14.
, 4.B.6, IEEE, Oct 2007.
[2] EUROCONTROL. Updated LDACS1 System Specification. SESAR Joint Undertaking, Aug 2011.
[3] EUROCONTROL. L-DACS2 System Definition Proposal. Deliverable D2, EUROCONTROL, 2009.
[4] ๺ં५, ॅ୩ହਓ, ੴग़໌. ରۭσʔλϦϯ
Ϋ LDACS ෺ཧ૚ͷ࣮૷. ୈ 11 ճಠཱߦ
੓๏ਓిࢠߤ๏‫ൃॴڀݚ‬දձߨԋ֓ཁ, pp.
25–28, June 2011.
[5] ๺ં५, ॅ୩ହਓ, ੴग़໌. ߤۭ༻ߴ଎σʔ
λϦϯΫ LDACS ͷ BER ಛੑ. ిࢠ৘ใ௨
৴ֶձ ٕज़‫ڀݚ‬ใࠂ SANE, Vol. 112, No.
360, pp. 37–42, Dec. 2012.
[6] Jun KITAORI. Results of LDACS PHY BER
performances with GNU Radio. ICAO ACP
WG-M20/IP-8, Jan 2013.
[7] ๺ં५, Ԙ‫֨ݟ‬Ұ, ॅ୩ହਓ, ੴग़໌. σʔλ
ϦϯΫ LDACS1 ͷϏοτ‫ޡ‬Γ཰ಛੑ. ୈ 14
ΑΓ΋௿Լ͢Δͱ‫ظ‬଴Ͱ͖Δɻ‫ޡ‬Γగਖ਼ద༻‫ޙ‬
ճಠཱߦ੓๏ਓిࢠߤ๏‫ൃॴڀݚ‬දձߨԋ
10-6
10-7
FL
RL
RL improved
4
6
8
10
12
C/N [dB]
14
16
18
20
ਤ 6 ENR ‫ڥ؀‬Լ BER ಛੑվળ݁Ռ
LDACS1 BER performances (APT, FEC)
0
10
10-1
-2
Bit Error Rate
10
10-3
10-4
10-5
10-6
FL
RL
RL improved
-7
10
4
6
ਤ7
8
10
12
C/N [dB]
14
16
18
20
APT ‫ڥ؀‬Լ BER ಛੑվળ݁Ռ
Ͱ͸ɼࣨ಺‫ڥ؀‬౳ͱҟͳΓड৴఺ʹ౸དྷ͢Δ֤
ૉ೾ͷిྗ͸౸དྷํ޲ʹΑͬͯ෼෍ʹภΓ͕͋
Δ΋ͷͱ૝ఆ͞ΕΔɻ௚઀೾ͳͲԿΒ͔ͷ༏੎
ͳૉ೾͕ଘࡏ͢Ε͹ Rice ϑΣʔδϯάʹ͍ۙঢ়
−4
BER ͕ 10
ϜͰ΋ϑϨʔϜ౰ͨΓ 2 Ϗοτఔ౓ҎԼͷ‫ޡ‬Γ
ͱͳΓɼ্Ґ૚ͷ࠶ૹ‫ػ‬ೳ౳ʹΑͬͯ఻ૹ৘ใͷ
ิঈ͕ՄೳͰ͋Δɻ
4
֓ཁ, pp. 41–44, June 2014.
ఔ౓ҎԼͰ͋Ε͹ FL σʔλϑϨʔ
·ͱΊ
ஶऀΒ͸ LPES ‫ͼٴ‬ϑΣʔδϯάγϛϡϨʔ
λ Λ ར ༻ ͠ ͯ ɼϑ Σ ʔ δ ϯ ά ‫ ͚ ͓ ʹ ڥ ؀‬Δ
LDACS1 ͷ BER ಛੑΛௐ͖ࠪͯͨ͠ɻͦͷ݁
Ռɼ‫ࡏݱ‬ఆٛ͞Ε͍ͯΔ RL σʔλϑϨʔϜͷύ
Πϩοτ৴߸഑ஔͰ͸ϑΣʔδϯά‫ʹڥ؀‬ऑ͘ɼ
FL σʔλϑϨʔϜʹൺ΂ͯஶ͘͠ BER ಛੑ͕
ྼԽ͢Δ͜ͱ͕Θ͔ͬͨɻ͜ͷͨΊ RL σʔλϑ
[8] ๺ં५, Ԙ‫֨ݟ‬Ұ. ϑΣʔδϯά‫ڥ؀‬Լʹ͓
͚Δ LDACS1 Ϗοτ‫ޡ‬Γ཰ಛੑ. ిࢠ৘ใ
௨৴ֶձ ٕज़‫ڀݚ‬ใࠂ SANE, Vol. 114, No.
397, pp. 95–99, Jan. 2015.
[9] Jun KITAORI. Updated LDACS1 BER performances with LPES. ICAO ACP WGM21/IP-2, Jul 2014.
[10] Erik Haas. Aeronautical Channel Modeling. IEEE Trans. on Vehicular Technology,
Vol. 51, No. 2, pp. 254–264, Mar. 2002.
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