AKE v wh Apv f Cs fo DS-CDMA Ss Muph Fg Chs JooHu Y Su M EEE JHog M EEE Shoo of E Egg Sou o Uvs Sh-og Gw-gu Sou 5-74 Ko E-: ohu@su As hs pp pv AKE v wh vs og s popos fo DS-CDMA ss uph fg hs h popos pv AKE v xpos vs pv f o AC o g h ff of oh uph fg up-ss f MA h MS goh wh v sp-sz s us o up h p-wgh vo of ACs h pfo of h popos v s vu opu suo fo h vous us of s AKE fgs s show h h popos v hvs sgf pfo pov ov ovo AKE v ouo A -squ o-vso up-ss DS- CDMA ss suffs fo up-ss f MA -f po h g s qu o g h ff of MA -f po h v vs oo s uus os hv popos As uus o pv f AC s s o h u -squ o MMSE o s ow h h AC hvs pfo h ovo h-f MF o whou uh s of v opx fo oh fow vs s []-[4] Ch fg uph popgo so us sv pfo go DS-CDMA ss o g h ff of h fg uph popgo AKE po vs og hv us fo DS-CDMA ss [7] o g h ooous ff of oh uph fg MA opoo of vs og f o s v g of o Usg g squ h AC wh vs s hvs sgf pfo pov ov h f v fqu f gh fg h [4] Aso o s ffvss of ssso h pv AKE v whou g squ s poss -ph gh fg h wh h sos AKE v us o ACs [5] B po whou g squ gs pfo of AC ow S o sv uph h hus s ss o pov so fo ACs hs pp AKE v wh ACs o wh vs s s popos fo DS-CDMA ss uph fg h popos v xpos oh sp vs o gu h po of ACs hs pp s ogz s foows so h s ss o s s so 3 AKE v wh up v ACs s popos u sus ps so 4 ousos w so 5 Ss Mo Cos DS-CDMA ss wh K suous uss A squ of h us s up uqu sgu wvfo o pou s s sg h sgu wvfo fo h h us s gv ϕ wh s h hp uo s h h of sgu squ ϕ s gu hp-pus
wh u g h s s sg of h h us s gv s ϕ wh { -} s h h s h uo / s possg g Assu h h h hs uph fg wh h u of sov phs p h of whh hs gh fg h h s sg s h pp- D o Wh h v hs J vs s h s pus spos of h h fo h h us o h h h v s gv δ δ 3 wh s s opx gh fg poss of whh pu phs spv fo h h ph of h h us h h h v s sg h h s gv s K 4 wh s h vg sg pow of h h us s h opx Guss os wh h pow sp s of Assu h h p h D o s o hp uo h fg poss s so sow h s os ov o uo h h oupu sp of h hp h-f MF fo h h AKE fg of h h s gv ϕ 5 Dug h uo oupu sps v sg vo [ - ] wh s possg g Suppos h h fs us s h s us h h v sg vo fo h h fg of h h s gv K 6 wh [ - ] s h sgu squ vo fo h fs us s -so f S 3 K s up-ss f MA fo h h us sos vo wh p zo- opx Guss o vs of whh g ps hv h v of / Assu h h popgo fo h fs ph of h h us s fo so g h v s h v [ ] fo ov of h pfo vuo Df s h fshf h gh-shf sgu squ vos hps fo h h us spv h h s of hos sgu squ vos gv ] [ χ > χ ] [ - spv wh χ A s o fuo fo h v A h S MA s gv { } { } 7 7 spv 3 Apv AKE v wh Dvs As hs pp pv AKE v wh ACs s popos Fg shows h ov suu of h popos v hvg wo vs s J AKE fgs fo h fs us Eh fg osss of vs o pv f AC Wh h h s p f h o
po of -so ss so- o h uss sv go h pfo of h AC [5] o pou pu fo h AC h v sg vos x-o-o vs o of h fg h pu of h AC fo h h fg h h s gv J * ˆ 8 wh ˆ* s h opx oug of h s h g s h v sg vo h h A A Chp MF Chp MF MC s fg [ ] [ MC ] h fg Apv C Apv Agoh Apv C Apv Agoh z 6 4 z 6 4 Fg Ov suu of h pv AKE v wh wo vs s f h s of h h g s u so h os of h phs vo s ops h h p of os os of foo o h s o u h opx of opuo [ ] s of s pp o h ospog AC A so v of h h fg h h s gv [ ] w 9 z wh w s h p-wgh vo of h svsp AC Fo h W-Hopf quo h opu p-wgh vo zg MSE s o s p wh E{[ ][ ]} s h uooo x of h AC s pu vo p E{ [ ]} s h oss-oo vo w h f h AC s pu vo [8] s op o opu op-u p-wgh vo fo v so uo s p o ow h v z ˆ h popos v pv hos p-wgh vo fo h h AC h h s gv [5] w x wh s h sgu squ fo h fs us x s pv opo whh s up o v so h MS goh h MS goh wh v sp-sz h pv opo s s o zo h s o g o h popos v uss s ˆ s f s of g squ fo gu MS goh so- o h pv opo fo h h AC h h s gv x x [ ] wh ˆ [ ] w s h o sg s h v sp-sz of h MS goh s ow h h vu of < < gus h p-wgh vo o ovg o h opu vo [7] [8] h popos v h v sp-sz s gv wh MSE MSEsh x / MSE sh f MSEsh < / f MSEsh > / ohws x s h sho- MSE whh s gv sh { } M M 3 M s h suo v fo h sho- MSE A f so v fo h s s o qu og h oupus of fgs g h f so v z s s so o h s h s s gv ˆ sg[ z ] sg z 4 wh sg[ x] fo x fo x <
4 u sus Assu h pf so s o h h g of h s us h popos pv AKE v h pfo of h popos v wh possg g 3 s opu Mo-Co suo fow h sgu squ fo h us s o s og f of Go squ of whh h go poos gv g D D D 5 g D D D 3 D 4 D 5 h uph fg poss fo h h of h hs 4 phs wh xpo s pof p 3499δ 76δ - δ 65δ -3 whh ssfs h os of u g gh fg poss of h ph s g f h Js o fo h oz fg f D whf D s h xu Dopp fqu [6] Up o wo v s os h v hs up o fou AKE fgs fo h Assu h v p of fg ospog wo s s h s h o BE h sus s vg fo o s h v [ ] h p-wgh vo of h AC fo h fg s up h MS goh wh h v sp-sz of 5 x Fg shows h BE of h popos pv AKE v ogh wh h of h ovo AKE v fo h u of uss K 5 sow fg h f D Fg shows h BE fo h u of s J s show h h pv AKE v hvs ow BE h h ovo AKE v hvg h s u of fgs h go of o hgh S As h u of AKE fgs ss h ou of pfo pov os o Fg shows h BE fo h u of s J s show h h popos v wh wo s hvs ow BE h h ovo AKE v hvg h s u of s fgs v h go of o ow S h pfo pov of h popos v wh wo s s o sgf h h wh o s us vs og povs f fo h ACs v ow E / Fg 3 shows h BE vsus h u of uss K fo h u of s J E / Bv fg h f D f h xu o BE s -3 h popos v wh h u of AKE fg of wo fou oo ou 5 o uss h h ovo AKE v hs quv o 8 5% ss h ss p spv Fg 4 shows h BE vsus h E / fo h u of uss K 5 h u of s J s h oz fg f D vs BE BE E E- E- E-3 E-4 E-5 E E- E- E-3 E-4 E-5 E-6 Ap AKE fg fg 4fg Cov AKE fg fg 4fg 4 8 6 E / B u of s J Ap AKE fg fg 4fg Cov AKE fg fg 4fg 4 8 6 E / B u of s J Fg BE vsus E / s h u of AKE fgs fo h u of uss K 5 v sow fg h f D
BE E E- E- E-3 E-4 E-5 E-6 Ap AKE fg fg 4fg Cov AKE fg fg 4fg 5 5 5 3 u of uss K Fg 3 BE vsus u of uss K fo h u of s J E / B sow fg h f D BE E E- E- E-3 E-4 E-5 f D fg fg 4fg f D fg fg 4fg 4 8 6 E / B Fg 4 BE vsus E / fo h u of uss K 5 h u of s J sh oz fg f D vs 5 Couso hs pp AKE v wh pv f s vs s s popos fo DS- CDMA ss As h u of vs s AKE fgs ss h pfo of h popos v s vu opu suo vous fg s s show h h popos AKE v hs pfo h ovo AKE v uph fg hs h pfo pov os o sgf usg vs Aso h pfo s o po sow fg vo h v fs fg o f [] H V oo S Vú o of o MMSE uus o EEE s fo ho vo 43 o 3 pp 858-87 M 997 [] S M A pv -squ ovso up-ss v fo uus f o EEE s Cou vo 43 o /3/4 pp 746-755 F/M/Ap 995 [3] B p B S Vu Apv v suus fo shoous CDMA sss EEE J S As Cou vo o 4 pp 685-697 M 994 [4] Y Cho Apv CDMA f o wh vs og gh fg h hd Dsso Sou o Uv Aug 999 [5] M v-ho M Ju Opp ofgu pv AKE v fo w CDMA sss o of h EEE VC 98 pp 74-744 Ow C M 8-998 [6]WCJsJMowv Mo Couos W 974 [7] J G os Dg Couos MGw-H 995 [8]SMKFu of Ss Sg ossg: Eso ho -H 993 s show h s h oz fg f D s s h pfo of h popos gs s us s h of h fg s fs h MS goh os p o vo of h hs phoo s o po h popos v wh sg h h wh wo s