LEADER 02682nam 2200409 450 001 9910821371203321 005 20230725030239.0 010 $a3-8325-9923-1 035 $a(CKB)4340000000242870 035 $a(MiAaPQ)EBC5219746 035 $a58a1c688-b9a4-4c3f-9ae6-3edeb0dd2d03 035 $a(EXLCZ)994340000000242870 100 $a20180530d2010 uy 0 101 0 $aeng 135 $aurcnu|||||||| 181 $ctxt$2rdacontent 182 $cc$2rdamedia 183 $acr$2rdacarrier 200 10$aCoherent cooperative relaying in low mobility wireless multiuser networks /$fStefan Berger 210 1$aBerlin :$cLogos Verlag Berlin,$d[2010] 210 4$dİ2010 215 $a1 online resource (348 pages) 225 0 $aSeries in wireless communications ;$vBand 10 300 $aPublicationDate: 20100815 311 $a3-8325-2536-X 330 $aLong description: In this thesis, several important aspects of cooperative wireless multiuser networks are investigated. The focus lies on coherent two-hop relaying networks where several amplify-and-forward (AF) relays assist the communication between multiple source-destination pairs. First, the impact of local oscillator (LO) imperfections and I/Q imbalance at the relays on two-hop relaying is investigated. A special focus lies on the comparison between frequency division duplexing (FDD) and time division duplexing (TDD) relays. Based on the observation that the direction in which a channel between two wireless nodes is measured has an impact on the estimate, phase synchronization requirements for coherent relaying networks are then found. Several channel estimation protocols that differ in the direction in which the single-hop channels are measured are furthermore identified and their performance is compared. Next, a very simple phase synchronization scheme is presented that provides a set of relays with a common LO phase. Two coherent beamforming schemes, namely multiuser zero-forcing (MUZF) and multiuser minimum mean squared error (MMSE) relaying, are then investigated. Finally, a real-world demonstrator for distributed wireless communication networks (called RACooN Lab) is presented. It was used to implement coherent cooperative communication schemes on a practical two-hop relaying network. 606 $aWireless communication systems 615 0$aWireless communication systems. 676 $a621.382 700 $aBerger$b Stefan$0156730 801 0$bMiAaPQ 801 1$bMiAaPQ 801 2$bMiAaPQ 906 $aBOOK 912 $a9910821371203321 996 $aCoherent cooperative relaying in low mobility wireless multiuser networks$93985423 997 $aUNINA