FILTER BANK MULTICARRIER WITH LAPPED TRANSFORMS

Transcription

1 FILTER BANK ULTICARRIER WITH LAPPED TRANSFORS aurc Bllagr, CNA Davd attra, aro Tada, Uv.Napol arch 5

2 Obctvs A multcarrr approach to mprov o OFD for futur wrlss systms - asychroous mult-usr accss - spctral sparato for coxstc - robustss to chal mparmts CFO p most of OFD faturs - spctral ffccy - mmum dlay - smplcty of cocpt - low computatoal complxty

3 Lappd Trasform: - dfto - mplmtato Outl Trasmsso systm prformac - sgal charactrstcs - chal qualzato Complx lappd trasform for FBC Op ssus - mplmtato - chal qualzato - carrr frqucy offst compsato

4 Lappd trasform Itroducd dcads ago to mprov th dscrmato of crtcal spctral compots sgal comprsso : tm doma ; : frqucy doma ; T, = h cos[ h =s[ + ] ] prfct dcomposto-rcostructo ovrlappg factor: K= ral procssg ovlty commucatos: frqucy doma qualzato

5 LT commucatos Ral lappd trasform QA modulato Lappd-OFD Complx lappd trasform PA modulato FBC-PA h Tc, ;, = +

6 Frqucy rspos Rspos of s fltr h: H L cos f f = f db Ampltud OFD Lappd-OFD ut=sub-carrr spacg Frqucy pars of symmtrcal carrrs stad of carrrs for th DFT

7 LT trasmsso ult-carrr trasmsso wth T, QA modulato ca b usd - dpdt ral procssg of ral ad magary parts of data FBC schm wth ovrlappg K= - dlay: qualzato th rcvr ca b prformd th frqucy doma o addtoal dlay frqucy doma rsdual CFO compsato mult-usr scaro

8 Implmtato Obctv: us a -DFT for frqucy doma qualzato Exprsso of th trasform ad -DFT + frqucy doma fltrg + phas shfts coffcts [ ] ] ][ [ 4, T = ]] [ ] [ [ 4, T =

9 Trascvr structur Trasmttr Rcvr data S / P + Q A Traspos Lappd Trasform Ovrlap / add + P/S chal S / P FFT E q u a l z a t o S f l t r Lappd Trasform P o s t p r o c s s. Q A d t c t + P/S data out mttd symbols of sampls ovrlap by sampls symbol rat: / qualzato at FFT output

10 Emttd spctrum Th lappd trasform dfs sub-carrrs - a sub-chal cossts of parts: ad - A f f -f -f / / -/ Spctrum: cotuous / fragmtd f.5 Ampltud.5 Ampltud Frqucy Frqucy

11 Trasmsso systm prformac

12 Evlop of mttd sgal Impact of tmg offst. a m p l tu d T O t m Tmg offst: to ; sgal-to-trfrc rato OFD: GT: guard tm SIR / L = to/ s to// SIR = / OFD togt /

13 Half rat schms Sgal-to-trfrc rato half rat SIR LHR = s / s 8 3 / to to + 6 to / Emttd sgal vlop. A m p ltud r a l m a g a ry. A m p ltud tm tm full rat half rat

14 SIR curvs Sgal-to-trfrc rato db SIR OFD-GT=6 /6 OFD-GT=3 /8 Lappd-OFD-half rat Lappd-OFD Tmg offst =56 ax. to = / SIR = 7.4 db BER =.5 4-QA

15 ultpath chal qualzato chal trasfr fucto C Z trfrc powr P = = c Z P P P P = = = c [ f f ] f = / s // SNR: multply trfrc+os by qualzr rspos

16 Bt rror rat =56 sub-chals Chal: ITU-R vh.b max.dlay:. < /4 Profl: dlay: ampl.: QA 64-QA

17 Asychroous accss OFD CP = 64 /4 O-tap FBC: OQA ; sgl tap qualzr ; K= FS-FBC: OQA ; frqucy doma qualzato OFD-lap: QA ; lappd trasform Chal ITU-R vh.b Eb/No= db 4-QA Symmtry

18 Pa-to-avrag powr rato PAPR Complmtary cumulatv dstrbuto fucto 5 db CCDF -5 - L-OFD ral/magary data L-OFD complx data full rat OFD L-OFD ral data ampltud

19 Complx lappd trasform for FBC

20 Complx trasform ad mplmtato Dfto Factorzato Implmtato Tc, Tc, = Phas shfts by multpls of / Frqucy doma fltrg, coffcts: [ ] ultply by tm shft: ½ Ivrs FFT of sz = s[ [ ] Ovrlap ad add ovrlappg factor K= + ] ;, 3

21 Trasmttr structur ultcarrr trasmttr d ral S / P P h a s s h f t s F l t r F F T o v r l a p + a d d P / S y chal PA modulato ultcarrr symbol lgth: Symbol rat:

22 Emttd spctrum =56 ; Numbr of usd sub-chals: 3x ; bary data ; 46 bts pr symbol ; rat: /.4 Ampltud Frqucy

23 Rcvr structur ultcarrr rcvr Frqucy doma qualzato Sub-chal fltrg aftr qualzato CFO compsato: trpolatd fltr coffcts p h a s s h f t s f l t r F F T d t c t o S / P y d p u t b u f f r q u a l z r P / S

24 Systm mpuls rspos frqucy tm Total magary trfrc powr: uty

25 SIR curvs Sgal-to-trfrc rato / tmg offst SIR 4 db OFD -GT=6 / OFD -GT=3 /8 5 FB C -P A Tmg offst =56 axmum tmg offst: / ; BER =.5 bary data asychroous accss

26 Bt rror rat =56 sub-chals Chal: ITU-R vh.b max.dlay:. < /4 Profl: dlay: ampl.: QA / -PA 64-QA / 8-PA

27 Carrr frqucy offst Compsato at sub-chal lvl mult-usr scaro CFO = δf ; Fltr output at tm for = m + +/ Rcvr fltr coffcts tm doma I th frqucy doma: trpolato of tal st [ ] f r r r x h y = = δ f r r f r x h y δ δ / / = + = h h f CFO ; / = δ

28 CFO compsato Compsato pr sub-chal or group of sub-chals Phas shft + trpolatd fltr coffcts db SIR trpolato:6 coffcts trpolato:4 coffcts 5 OFD 5 o fltr coffct trpolato CFO ut:sub-carrr spacg

29 BER vrsus CFO Prformac of OFD, lappd OFD, FBC-PA 4-QA/-PA Eb/No = 8dB Normalzd CFO C: full compsato C3: 3 coffcts C5: 5 coffcts C7: 7 coffcts

30 Op ssus Algorthmc aspcts Gralzato xtdd lappd trasform Othr systm optos ad paramtr slcto Optmzato of th structur Effct mplmtato mmal complxty Prformac aalyss multpl asychroous usrs Comparso wth hacd OFD tchqus fltrd OFD, uvrsal fltrd multcarrr, gralzd FD

31 Op ssus Ntworg aspcts Sgl carrr tchqus Prambl ad plots for burst trasmsso Duplxg: TDD, FDD, full duplx IO ad massv IO Compatblty wth OFD Capablty to mt 5G prformac obctvs µs tm budgt for PHY, 55 db ACLR, short bursts,