Performance Analysis of Cooperative Communication in the Presence of Co-channel Interference Fei XU 1,a, Xian-Yi RUI 1,b,*

Transcription

1 06 Jont Intenatonal Confeence on Sevce Scence, Management an Engneeng (SSME 06) an Intenatonal Confeence on Infomaton Scence an Technology (IST 06) ISB: efomance Analy of Coopeatve Communcaton n the eence of Co-channel Intefeence Fe XU,a, Xan-Y UI,b,* College of Electonc an Infomaton Engneeng, Soochow Unvety, Suzhou, Chna a xucathy@foxmalcom, b xyu@uaeucn *Coeponng autho Keywo: Co-channel ntefeence, Coopeatve communcaton, Bt eo ate, Channel capacty Abtact efomance analy wthout ntefeence hypothe can not be ectly apple to the actual coopeatve communcaton ytem Th pape focue on ntefeence moel an pefomance analy, an we nvetgate pefomance of amplfy-an-fowa (AF) coopeatve communcaton ytem n the peence of co-channel ntefeence Smulaton eult how that: channel capacty an BE of AF collaboaton ytem ae ubect to a cetan egee of lo becaue of co-channel ntefeence An wth the nceang gnal-to-noe ato (S), the lo of popete geate Intoucton Impove eouce utlzaton motly at the expene of ytem elablty when we apply hgh pectal effcency technology to the wele communcaton netwok Hgh pectal effcency technology may be euce the othogonalty between the gnal becaue of t nheent mechanm, whch lea nto a lage numbe of co-channel ntefeence [] The actual cellula communcaton ytem uffe fom pefomance lo becaue each of the communcaton noe ae often ubect to co-channel ntefeence [] Co-channel ntefeence an mpotant facto etctng an affectng the pefomance of the wele communcaton ytem Some lteatue analyze pefomance of coopeatve communcaton n peence of ntefeence on the elay noe o the etnaton noe [3] Only conee elay noe wa affecte by co-channel ntefeence, tue elay electon n vaable gan AF ytem In ecoe-an-fowa(f) elayng ytem, the cloe-fom expeon of outage pobablty wa analyze n [4] In the lteatue [5], C Zhong Cone the elay noe o the etnaton noe affecte by co-channel ntefeence, futhe eve outage pobablty expeon fo AF an F elay ytem n ntefeence-lmte cenao Howeve, moe than a few lteatue cone only the elay noe o the etnaton noe affecte by co-channel ntefeence In th pape, we aume that elay noe an etnaton noe ae both affecte by co-channel ntefeence, nvetgate pefomance of amplfy-an-fowa(af) coopeatve communcaton ytem Sytem Moel Shown n Fg, t a two-hop elay coopeatve ytem une the peme that the elay noe an etnaton noe ae affecte by co-channel ntefeence In oe to etablh ntefeence moel of geneal applcablty, the moel aume that elay noe an etnaton noe ae affecte by a plualty of ntefeence epectvely

2 Fgue Two-hop elay ytem n the peence of co-channel ntefeence The communcaton poce ve nto two lot, the ft lot, ue to multple ntefeence an atve whte Gauan noe at the elay, eceve gnal can be expee a: 0 = y = h S + h S + n () Whee S an at elay noe epaately,,, epeent tanmtte gnal powe at ouce noe an -th ntefeence powe the ntefeence quantty at the elay coeffcent between the ouce noe an the elay noe an h h enote channel epeent channel coeffcent between -th channel ntefeence an the elay noe S 0 an S, ae tanmon ymbol an ntefeng gnal n atve whte Gauan noe at the elay noe ung the econ lot, the moel aume that etnaton noe affecte by multple ntefeence an atve whte Gauan noe The eceve gnal at gven by: y = h Gy + g S + n () =,, Whee h enote channel fang coeffcent between the elay noe an the etnaton noe G the amplfcaton facto an we enote channel coeffcent between -th channel ntefeence an the etnaton noe by g, epeent -th ntefeence powe at etnaton noe the ntefeence quantty at the etnaton an S ae ntefeng gnal, n atve whte Gauan noe at the etnaton noe In oe to meet the tanmon powe etcton, the amplfcaton facto G may be electe to be: G = Whee Ω + = Ω + σ, epeent tanmt powe at elay, = E( h ) Ω, Ω = E( h ), = E( n ) σ We uually meaue pefomance of ntefeence wth gnal to ntefeence plu noe powe ato(si), en to en SI at the etnaton can be expee a: (3)

3 0 G h h = (4) G h, h + σ +, g + σ = = Equaton (3) nto (4), can be futhe mplfe a: = (5) + C Whee = 0 h, = h, =, h, =, g, C = 0 Ω +, Ω = = = Smulaton eult In th ecton, we mulate the change of ytem channel capacty an aveage bt eo ate n amplfy-an-fowa coopeatve communcaton ytem extng co-channel ntefeence We et mulaton envonment a follow: channel between any two noe flat aylegh fang channel, an each channel ae nepenent We aume that elay noe an etnaton noe ae affecte by ntefeence an = = The tanmon powe of the ouce noe an the elay noe ae equal, e = We gnoe the ect tanmon between the ouce an etnaton an et ata tanmon =0000 The ouce gnal a BSK moulaton, bae on amplfy-an-fowa(af) potocol 3 5 pefect ntefeence C(bp/Hz) S(B) Fgue Channel capacty n the peence of co-channel ntefeence fo AF

4 0 0 pefect ntefeence BE S(B) Fgue 3 Bt eo ate n the peence of co-channel ntefeence fo AF Fg how the channel capacty n the peence of co-channel ntefeence fo AF In Fg3, we llutate the aveage bt eo ate of AF elayng wth co-channel ntefeence In the above compaon chat, the ta lne ncate the pefomance of communcaton ytem n the peence of co-channel ntefeence, an ccle lne epeent the pefomance of channel capacty an aveage bt eo ate (BE) wthout co-channel ntefeence A can be een fom Fg an Fg3, ue to co-channel ntefeence, the pefomance channel capacty an BE ae ubect to a cetan egee of lo We can ee that the pefomance of channel capacty an BE wth ntefeence ae woe a nceang tanmt gnal-to-noe ato (S) Concluon We nvetgate pefomance of amplfy-an-fowa (AF) coopeatve communcaton ytem n the peence of co-channel ntefeence Smulaton eult how that: channel capacty an BE of AF collaboaton ytem ae ubect to a cetan egee of lo becaue of co-channel ntefeence An wth the nceang gnal-to-noe ato (S), the geate the lo of popete Acknowlegement Th eeach wa fnancally uppote by atual Scence Foun of Chna (o603, 67360) efeence [] M K Smon, M S Aloun, gtal Communcaton Ove Fang Channel, econ e, John Wley & Son, 005 [] Lee J, Han J K, Zhang J C, MIMO technologe n 3G LTE an LTE-avance, UASI Jounal on Wele Communcaton an etwokng (009) -0

5 [3] I Kk, J S Thompon, S Mclaughln, Max-mn elay electon fo legacy amplfy-an-fowa ytem wth ntefeence, IEEE Tanacton on Wele Commun 8 (009) [4] Suaweea, C Beauleu, Outage pobablty of ecoe an fowa elayng wth optmum combnng n the peence of co-channel ntefeence an akagam fang, IEEE Wele Communcaton Lette (03) [5] C Zhong, S Jn, K K Wong, ual-hop ytem wth noy elay an ntefeence-lmte etnaton, IEEE Tanacton on Commun 58 (00)