Orthogonal frequency-division multiplexing (OFDM) suffers from high out-of-band radiation that prohibits the efficient use of the available spectrum particularly in OFDM based overlay systems. Recently, three different techniques for sidelobe suppression have been proposed and are recapitulated in this paper. One approach referred to as subcarrier weighting is based on weighting the individual subcarriers such that their sidelobes cancel each other. Alternatively, cancellation carriers are inserted at the edges of the spectrum in order to cancel the sidelobes of the transmit (Tx) signal. Thirdly, with the multiple choice sequences method, the symbol vector is transformed into multiple equivalent Tx sequences and the one with the lowest sidelobe power is transmitted. Sidelobes are reduced significantly at the expense of a slightly ncreased bit error rate or a reduced throughput. In order to further improve performance, in the paper, the combination with Tx windowing and reasonable combinations of the three methods are proposed and investigated. Simulation results show that the suppression achieved with the joint application of two techniques considerably exceeds the suppression achieved with the methods applied separately.
{"title":"Transmission Systems Techniques for reducing out-of-band radiation in OFDM based transmission systems","authors":"S. Brandes, I. Cosovic, M. Schnell","doi":"10.1002/ett.1406","DOIUrl":"https://doi.org/10.1002/ett.1406","url":null,"abstract":"Orthogonal frequency-division multiplexing (OFDM) suffers from high out-of-band radiation that prohibits the efficient use of the available spectrum particularly in OFDM based overlay systems. Recently, three different techniques for sidelobe suppression have been proposed and are recapitulated in this paper. One approach referred to as subcarrier weighting is based on weighting the individual subcarriers such that their sidelobes cancel each other. Alternatively, cancellation carriers are inserted at the edges of the spectrum in order to cancel the sidelobes of the transmit (Tx) signal. Thirdly, with the multiple choice sequences method, the symbol vector is transformed into multiple equivalent Tx sequences and the one with the lowest sidelobe power is transmitted. Sidelobes are reduced significantly at the expense of a slightly ncreased bit error rate or a reduced throughput. In order to further improve performance, in the paper, the combination with Tx \u0000windowing and reasonable combinations of the three methods are proposed and investigated. Simulation results show that the suppression achieved with the joint application of two techniques considerably exceeds the suppression achieved with the methods applied separately.","PeriodicalId":50473,"journal":{"name":"European Transactions on Telecommunications","volume":"2 1","pages":"142-153"},"PeriodicalIF":0.0,"publicationDate":"2010-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75939349","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Adinoyi A, 2007, IEEE T WIREL COMMUN, V6, P533, DOI 10.1109-TWC.2007.05227; ALEN B, 2005, ADAPTIVE ARRAY SYSTE; Alexiou A, 2004, IEEE COMMUN MAG, V42, P90, DOI 10.1109-MCOM.2004.1336725; Balanis C. A., 2005, ANTENNA THEORY ANAL; Cho JW, 2004, IEEE J SEL AREA COMM, V22, P1206, DOI 10.1109-JASC.2004.829340; DAWY Z, 2003, IEEE GLOB COMM C GLO; DAWY Z, 2006, IEEE GLOB COMM C GLO; DAWY Z, 2006, IEEE INT C COMM ICC; *ETSI, 1998, 3003 UMTS ETSI; Goldsmith A., 2005, WIRELESS COMMUNICATI; HERHOLD P, 2003, IEEE SEM VEH TECHN C; Holma H, 2000, WCDMA UMTS; KO YB, 2000, P IEEE INFOCOM 2000; Laiho J., 2006, RADIO NETWORK PLANNI; Mailoux R. J., 2005, PHASED ARRAY ANTENNA; ONAT FA, 2006, IEEE GLOBECOM; ONAT FA, 2006, IEEE CAN C EL COMP E; Pabst R, 2004, IEEE COMMUN MAG, V42, P80, DOI 10.1109-MCOM.2004.1336724; SAHA AK, 2004, IEEE GLOB COMM C GLO; SINGH H, 2003, 14 IEEE INT S PERS I; SPYROPOULOS A, 2003, P ICC 2003 ANCH AL U; TAKAI M, 2003, 6 ACM INT WORKSH MOD; Tsai JA, 2004, IEEE T WIREL COMMUN, V3, P695, DOI 10.1109-TWC.2004.826332; VILZMANN R, 2005, IEEE WORKSH WIR MESH; YAACOUB E, 2005, 16 IEEE INT S PERS I; Yanikomeroglu H, 2002, 2 WORKSH APPL SERV W; YI S, 2003, ACM INT S MOB AD HOC
{"title":"Wireless Systems Fixed relaying with adaptive antenna arrays for the downlink of multihop cellular networks","authors":"Z. Dawy, I. Nabi","doi":"10.1002/ett.1400","DOIUrl":"https://doi.org/10.1002/ett.1400","url":null,"abstract":"Adinoyi A, 2007, IEEE T WIREL COMMUN, V6, P533, DOI 10.1109-TWC.2007.05227; ALEN B, 2005, ADAPTIVE ARRAY SYSTE; Alexiou A, 2004, IEEE COMMUN MAG, V42, P90, DOI 10.1109-MCOM.2004.1336725; Balanis C. A., 2005, ANTENNA THEORY ANAL; Cho JW, 2004, IEEE J SEL AREA COMM, V22, P1206, DOI 10.1109-JASC.2004.829340; DAWY Z, 2003, IEEE GLOB COMM C GLO; DAWY Z, 2006, IEEE GLOB COMM C GLO; DAWY Z, 2006, IEEE INT C COMM ICC; *ETSI, 1998, 3003 UMTS ETSI; Goldsmith A., 2005, WIRELESS COMMUNICATI; HERHOLD P, 2003, IEEE SEM VEH TECHN C; Holma H, 2000, WCDMA UMTS; KO YB, 2000, P IEEE INFOCOM 2000; Laiho J., 2006, RADIO NETWORK PLANNI; Mailoux R. J., 2005, PHASED ARRAY ANTENNA; ONAT FA, 2006, IEEE GLOBECOM; ONAT FA, 2006, IEEE CAN C EL COMP E; Pabst R, 2004, IEEE COMMUN MAG, V42, P80, DOI 10.1109-MCOM.2004.1336724; SAHA AK, 2004, IEEE GLOB COMM C GLO; SINGH H, 2003, 14 IEEE INT S PERS I; SPYROPOULOS A, 2003, P ICC 2003 ANCH AL U; TAKAI M, 2003, 6 ACM INT WORKSH MOD; Tsai JA, 2004, IEEE T WIREL COMMUN, V3, P695, DOI 10.1109-TWC.2004.826332; VILZMANN R, 2005, IEEE WORKSH WIR MESH; YAACOUB E, 2005, 16 IEEE INT S PERS I; Yanikomeroglu H, 2002, 2 WORKSH APPL SERV W; YI S, 2003, ACM INT S MOB AD HOC","PeriodicalId":50473,"journal":{"name":"European Transactions on Telecommunications","volume":"8 1","pages":"167-177"},"PeriodicalIF":0.0,"publicationDate":"2010-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81102886","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
S. Muhammad, T. Javornik, I. Jelovcan, Zabih Ghassemlooy, E. Leitgeb
Error control coded M-ary pulse position modulation (PPM) can be used over free space optical links to mitigate the atmospheric attenuations and the turbulence induced fading. In this paper, we present performance analysis for coded free space optics (FSO) communication systems operating over various atmospheric conditions. We justify the selection of higher state PPM as an appropriate modulation scheme for the links and provide a comparative analysis between hard decision decoded (Reed-Solomon, RS) and soft decision decoded (Turbo) channel coded PPM over varying link conditions. Simulation results strongly indicate RS-coded PPM as a robust and well-performing coded-modulation scheme for the FSO links.
{"title":"Optical Communications Comparison of hard-decision and soft-decision channel coded M-ary PPM performance over free space optical links","authors":"S. Muhammad, T. Javornik, I. Jelovcan, Zabih Ghassemlooy, E. Leitgeb","doi":"10.1002/ett.1343","DOIUrl":"https://doi.org/10.1002/ett.1343","url":null,"abstract":"Error control coded M-ary pulse position modulation (PPM) can be used over free space optical links to mitigate the atmospheric attenuations and the turbulence induced fading. In this paper, we present performance analysis for coded free space optics (FSO) communication systems operating over various atmospheric conditions. We justify the selection of higher state PPM as an appropriate modulation scheme for the links and provide a comparative analysis between hard decision decoded (Reed-Solomon, RS) and soft decision decoded (Turbo) channel coded PPM over varying link conditions. Simulation results strongly indicate RS-coded PPM as a robust and well-performing coded-modulation scheme for the FSO links.","PeriodicalId":50473,"journal":{"name":"European Transactions on Telecommunications","volume":"82 1","pages":"746-757"},"PeriodicalIF":0.0,"publicationDate":"2009-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85858946","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：