多用户干扰对可见光通信直流偏置光正交频分复用码分多址系统性能的影响
|
摘要
结合直流偏置光正交频分复用(DCO-OFDM)和码分多址(CDMA),建立了DCO-MC-CDMA系统。受系统结构限制,选用Gold码和m序列作为扩频地址码时,互相关性比正交码差,进而导致更大的多用户间干扰(MUI)。采用最大比合并、等增益合并和正交恢复合并(ORC),推导了受加性高斯白噪声、MUI和限幅噪声影响时信噪比的表达式,并基于Matlab建立了蒙特卡罗误码率(BER)仿真模型。研究结果表明:随着用户数的增大,MUI会使系统BER性能变差;ORC消除了子信道增益不同导致的MUI,因而BER性能最好;Gold码的互相关性比m序列好,采用Gold码的DCO-MC-CDMA系统BER性能更好。
Based on the direct-current-biased optical orthogonal frequency division multiplexing(DCO-OFDM)combined with code division multiple access(CDMA),a DCO-MC-CDMA system is built.When the Gold code and m-sequence are selected as spread spectrum address codes in the proposed system,their cross-correlation is worse than that of orthogonal codes owing to the limitation of the system structure,leading to a greater multi-user interference(MUI).The maximum ratio combining,equal gain combining,and orthogonal recovery combining(ORC)are used to derive the signal-to-noise ratio expression under the influences of additive white Gaussian noise,MUI,and limiting noise.The simulation model of the Monte Carlo bit error rate (BER)in MATLAB is established.The research results show that with the increase of the number of users,the MUI makes the system BER performance worse.In contrast,the ORC eliminates the MUI induced by the difference between subchannel gains,and thus the BER performance is the best.The BER performance of the DCO-MC-CDMA system with the Gold code is better,because the cross-correlation of the Gold code is better than that of the m-sequence in
Based on the direct-current-biased optical orthogonal frequency division multiplexing(DCO-OFDM)combined with code division multiple access(CDMA),a DCO-MC-CDMA system is built.When the Gold code and m-sequence are selected as spread spectrum address codes in the proposed system,their cross-correlation is worse than that of orthogonal codes owing to the limitation of the system structure,leading to a greater multi-user interference(MUI).The maximum ratio combining,equal gain combining,and orthogonal recovery combining(ORC)are used to derive the signal-to-noise ratio expression under the influences of additive white Gaussian noise,MUI,and limiting noise.The simulation model of the Monte Carlo bit error rate (BER)in MATLAB is established.The research results show that with the increase of the number of users,the MUI makes the system BER performance worse.In contrast,the ORC eliminates the MUI induced by the difference between subchannel gains,and thus the BER performance is the best.The BER performance of the DCO-MC-CDMA system with the Gold code is better,because the cross-correlation of the Gold code is better than that of the m-sequence in
引文
[1]Andrews J G,Buzzi S,Choi W,et al.What will 5Gbe?[J].IEEE Journal on Selected Areas in Communications,2014,32(6):1065-1082.
[2]Komine T,Haruyama S,Nakagawa M.A study of shadowing on indoor visible-light wireless communication utilizing plural white LED lightings[J].Wireless Personal Communications,2005,34(1/2):211-225.
[3]González O,Martín-González J A,Poves E,et al.Adaptive code-division multiple-access system for communications over indoor wireless optical channels based on random optical codes[J].IETOptoelectronics,2009,3(4):187-196.
[4]Salehi J A.Code division multiple-access techniques in optical fiber networks.I.Fundamental principles[J].IEEE Transactions on Communications,1989,37(8):824-833.
[5]Salehiomran A,Salehi J A.Spatial heterodyning optical code division multiple access technique for near-field free-space optical communication systems[J].Journal of Optical Communications and Networking,2009,1(5):498-511.
[6]O′Farrell T,Kiatweerasakul M.Performance of a spread spectrum infrared transmission system under ambient light interference[C]∥Ninth IEEEInternational Symposium on Personal,Indoor and Mobile Radio Communications,September 8-11,1998,Boston,MA.New York:IEEE,2002:703-707.
[7]Schenk T C W,Feri L,Yang H M,et al.Optical wireless CDMA employing solid state lighting LEDs[C]∥2009IEEE/LEOS Summer Topical Meeting,July 20-22,2009,Newport Beach,CA,USA.New York:IEEE,2009:23-24.
[8]He C,Yang L L,Xiao P,et al.DS-CDMA assisted visible light communications systems[C]∥2015IEEE 20th International Workshop on Computer Aided Modelling and Design of Communication Links and Networks(CAMAD),September 7-9,2015,Guildford,UK.New York:IEEE,2015:27-32.
[9]Matsuo R,Matsuo M,Ohtsuki T,et al.Performance analysis of indoor infrared wireless systems using OOK CDMA on a diffuse channel[J].Electronics and Communications in Japan(Part I:Communications),2001,84(10):1-9.
[10]Guan W P,Wu Y X,Wen S S,et al.Indoor positioning technology of visible light communication based on CDMA modulation[J].Acta Optica Sinica,2016,36(11):1106006.关伟鹏,吴玉香,文尚胜,等.基于CDMA调制的可见光通信室内定位技术的研究[J].光学学报,2016,36(11):1106006.
[11]Yuan X G,Zhang Y A,Zhang J N,et al.Visible light communication system based on direct sequence spread spectrum[J].Acta Optica Sinica,2014,34(s1):s106004.袁学光,张阳安,张锦南,等.基于直接序列扩频的可见光通信系统[J].光学学报,2014,34(s1):s106004.
[12]Matsuo R,Ohtsuki T,Sasase I.Performance analysis of indoor infrared wireless systems using PPM CDMA with linealizer with dead-zone and PPMCDMA with hard-limiter on diffuse channels[C]∥ICC 2001.IEEE International Conference on Communications.Conference Record(Cat.No.01CH37240),June 11-14,2001,Helsinki,Finland.New York:IEEE,2001:2016-2020.
[13]Liu J,Pan Z N,Noonpakdee W,et al.Impact of light reflection on indoor wireless optical CDMAsystems[J].Journal of Optical Communications and Networking,2012,4(12):989-996.
[14]Alsaadi F E,Elmirghani J M H.MC-CDMA indoor optical wireless system[C]∥IEEE GLOBECOM2007-IEEE Global Telecommunications Conference,November 26-30,2007,Washington,D.C.,USA.New York:IEEE,2007:2455-2460.
[15]Tanaka Y,Komine T,Haruyama S,et al.Indoor visible communication utilizing plural white LEDs as lighting[C]∥12th IEEE International Symposium on Personal,Indoor and Mobile Radio Communications.PIMRC 2001.Proceedings(Cat.No.01TH8598),September 30-October 3,2001,San Diego,CA,USA.New York:IEEE,2001:F81-F85.
[16]Fu W H,Wei J,Liu N A,et al.OFDM modem system simulation experiment based on MATLAB[J].Journal of Electrical and Electronic Teaching,2018(2):139-143.付卫红,韦娟,刘乃安,等.基于Matlab的OFDM调制解调系统仿真实验[J].电气电子教学学报,2018(2):139-143.
[17]Luan Y Z,Jiang G,Li J D.MC-CDMA for optical wireless communications[J].Proceedings of SPIE,2005,6021:60210Z.
[18]Alsaadi F E,Elmirghani J M H.Adaptive mobile line strip multibeam MC-CDMA optical wireless system employing imaging detection in a real indoor environment[J].IEEE Journal on Selected Areas in Communications,2009,27(9):1663-1675.
[19]Alsaadi F E,Elmirghani J M H.Spot diffusing angle diversity MC-CDMA optical wireless system[J].IETOptoelectronics,2009,3(3):131-141.
[20]Farooqui M Z,Saengudomlert P.Transmit power reduction through subcarrier selection for MC-CDMA-based indoor optical wireless communications with IM/DD[J].EURASIP Journal on Wireless Communications and Networking,2013,2013:138.
[21]Abdelaziz A M,El-Shimy M A,El-Sahn Z A.Reduced complexity interleaved multi-carrier CDMAfor indoor visible light communications[C]∥2017IEEE Photonics Conference(IPC),October 1-5,2017,Orlando,FL,USA.New York:IEEE,2017:551-552.
[22]Shoreh M H,Fallahpour A,Salehi J A.Design concepts and performance analysis of multicarrier CDMA for indoor visible light communications[J].Journal of Optical Communications and Networking,2015,7(6):554-562.
[23]Jia K J,Hao L.The design and performance analysis of optical wireless ACO-MC-CDMA system in the presence of clipping noise[J].Science China Information Sciences,2018,61(2):029304.
[24]Harada H,Prasad R.Simulation and software radio for mobile communications[M].Norwood,MA,USA:Artech House,Inc.,2002.
[25]O′farrell T.Spread spectrum communication:US6181729[P].2001-1-30.
[26]Jia K J,Jin B,Hao L,et al.Performance analysis of DCO-OFDM and ACO-OFDM systems in indoor visible light communications[J].Chinese Journal of Lasers,2017,44(8):0806003.贾科军,靳斌,郝莉,等.室内可见光通信中DCO-OFDM和ACO-OFDM系统性能分析[J].中国激光,2017,44(8):0806003.
[27]Jia K J,Hao L,Yu C H.Modeling of multipath channel and performance analysis of MIMO-ACO-OFDM system for indoor visible light communications[J].Acta Optica Sinica,2016,36(7):0706005.贾科军,郝莉,余彩虹.室内可见光通信多径信道建模及MIMO-ACO-OFDM系统性能分析[J].光学学报,2016,36(7):0706005.
[28]Elgala H,Mesleh R,Haas H.Practical considerations for indoor wireless optical system implementation using OFDM[C]∥2009 10th International Conference on Telecommunications,June 8-10,2009,Zagreb,Croatia.New York:IEEE,2009:25-29.
[29]Carruthers J B,Kahn J M.Modeling of nondirected wireless infrared channels[J].IEEE Transactions on Communications,1997,45(10):1260-1268.
[30]Wilson S K,Armstrong J.Transmitter and receiver methods for improving asymmetrically-clipped optical OFDM[J].IEEE Transactions on Wireless Communications,2009,8(9):4561-4567.
[31]Dimitrov S,Sinanovic S,Haas H.Clipping noise in OFDM-based optical wireless communication systems[J].IEEE Transactions on Communications,2012,60(4):1072-1081.
[2]Komine T,Haruyama S,Nakagawa M.A study of shadowing on indoor visible-light wireless communication utilizing plural white LED lightings[J].Wireless Personal Communications,2005,34(1/2):211-225.
[3]González O,Martín-González J A,Poves E,et al.Adaptive code-division multiple-access system for communications over indoor wireless optical channels based on random optical codes[J].IETOptoelectronics,2009,3(4):187-196.
[4]Salehi J A.Code division multiple-access techniques in optical fiber networks.I.Fundamental principles[J].IEEE Transactions on Communications,1989,37(8):824-833.
[5]Salehiomran A,Salehi J A.Spatial heterodyning optical code division multiple access technique for near-field free-space optical communication systems[J].Journal of Optical Communications and Networking,2009,1(5):498-511.
[6]O′Farrell T,Kiatweerasakul M.Performance of a spread spectrum infrared transmission system under ambient light interference[C]∥Ninth IEEEInternational Symposium on Personal,Indoor and Mobile Radio Communications,September 8-11,1998,Boston,MA.New York:IEEE,2002:703-707.
[7]Schenk T C W,Feri L,Yang H M,et al.Optical wireless CDMA employing solid state lighting LEDs[C]∥2009IEEE/LEOS Summer Topical Meeting,July 20-22,2009,Newport Beach,CA,USA.New York:IEEE,2009:23-24.
[8]He C,Yang L L,Xiao P,et al.DS-CDMA assisted visible light communications systems[C]∥2015IEEE 20th International Workshop on Computer Aided Modelling and Design of Communication Links and Networks(CAMAD),September 7-9,2015,Guildford,UK.New York:IEEE,2015:27-32.
[9]Matsuo R,Matsuo M,Ohtsuki T,et al.Performance analysis of indoor infrared wireless systems using OOK CDMA on a diffuse channel[J].Electronics and Communications in Japan(Part I:Communications),2001,84(10):1-9.
[10]Guan W P,Wu Y X,Wen S S,et al.Indoor positioning technology of visible light communication based on CDMA modulation[J].Acta Optica Sinica,2016,36(11):1106006.关伟鹏,吴玉香,文尚胜,等.基于CDMA调制的可见光通信室内定位技术的研究[J].光学学报,2016,36(11):1106006.
[11]Yuan X G,Zhang Y A,Zhang J N,et al.Visible light communication system based on direct sequence spread spectrum[J].Acta Optica Sinica,2014,34(s1):s106004.袁学光,张阳安,张锦南,等.基于直接序列扩频的可见光通信系统[J].光学学报,2014,34(s1):s106004.
[12]Matsuo R,Ohtsuki T,Sasase I.Performance analysis of indoor infrared wireless systems using PPM CDMA with linealizer with dead-zone and PPMCDMA with hard-limiter on diffuse channels[C]∥ICC 2001.IEEE International Conference on Communications.Conference Record(Cat.No.01CH37240),June 11-14,2001,Helsinki,Finland.New York:IEEE,2001:2016-2020.
[13]Liu J,Pan Z N,Noonpakdee W,et al.Impact of light reflection on indoor wireless optical CDMAsystems[J].Journal of Optical Communications and Networking,2012,4(12):989-996.
[14]Alsaadi F E,Elmirghani J M H.MC-CDMA indoor optical wireless system[C]∥IEEE GLOBECOM2007-IEEE Global Telecommunications Conference,November 26-30,2007,Washington,D.C.,USA.New York:IEEE,2007:2455-2460.
[15]Tanaka Y,Komine T,Haruyama S,et al.Indoor visible communication utilizing plural white LEDs as lighting[C]∥12th IEEE International Symposium on Personal,Indoor and Mobile Radio Communications.PIMRC 2001.Proceedings(Cat.No.01TH8598),September 30-October 3,2001,San Diego,CA,USA.New York:IEEE,2001:F81-F85.
[16]Fu W H,Wei J,Liu N A,et al.OFDM modem system simulation experiment based on MATLAB[J].Journal of Electrical and Electronic Teaching,2018(2):139-143.付卫红,韦娟,刘乃安,等.基于Matlab的OFDM调制解调系统仿真实验[J].电气电子教学学报,2018(2):139-143.
[17]Luan Y Z,Jiang G,Li J D.MC-CDMA for optical wireless communications[J].Proceedings of SPIE,2005,6021:60210Z.
[18]Alsaadi F E,Elmirghani J M H.Adaptive mobile line strip multibeam MC-CDMA optical wireless system employing imaging detection in a real indoor environment[J].IEEE Journal on Selected Areas in Communications,2009,27(9):1663-1675.
[19]Alsaadi F E,Elmirghani J M H.Spot diffusing angle diversity MC-CDMA optical wireless system[J].IETOptoelectronics,2009,3(3):131-141.
[20]Farooqui M Z,Saengudomlert P.Transmit power reduction through subcarrier selection for MC-CDMA-based indoor optical wireless communications with IM/DD[J].EURASIP Journal on Wireless Communications and Networking,2013,2013:138.
[21]Abdelaziz A M,El-Shimy M A,El-Sahn Z A.Reduced complexity interleaved multi-carrier CDMAfor indoor visible light communications[C]∥2017IEEE Photonics Conference(IPC),October 1-5,2017,Orlando,FL,USA.New York:IEEE,2017:551-552.
[22]Shoreh M H,Fallahpour A,Salehi J A.Design concepts and performance analysis of multicarrier CDMA for indoor visible light communications[J].Journal of Optical Communications and Networking,2015,7(6):554-562.
[23]Jia K J,Hao L.The design and performance analysis of optical wireless ACO-MC-CDMA system in the presence of clipping noise[J].Science China Information Sciences,2018,61(2):029304.
[24]Harada H,Prasad R.Simulation and software radio for mobile communications[M].Norwood,MA,USA:Artech House,Inc.,2002.
[25]O′farrell T.Spread spectrum communication:US6181729[P].2001-1-30.
[26]Jia K J,Jin B,Hao L,et al.Performance analysis of DCO-OFDM and ACO-OFDM systems in indoor visible light communications[J].Chinese Journal of Lasers,2017,44(8):0806003.贾科军,靳斌,郝莉,等.室内可见光通信中DCO-OFDM和ACO-OFDM系统性能分析[J].中国激光,2017,44(8):0806003.
[27]Jia K J,Hao L,Yu C H.Modeling of multipath channel and performance analysis of MIMO-ACO-OFDM system for indoor visible light communications[J].Acta Optica Sinica,2016,36(7):0706005.贾科军,郝莉,余彩虹.室内可见光通信多径信道建模及MIMO-ACO-OFDM系统性能分析[J].光学学报,2016,36(7):0706005.
[28]Elgala H,Mesleh R,Haas H.Practical considerations for indoor wireless optical system implementation using OFDM[C]∥2009 10th International Conference on Telecommunications,June 8-10,2009,Zagreb,Croatia.New York:IEEE,2009:25-29.
[29]Carruthers J B,Kahn J M.Modeling of nondirected wireless infrared channels[J].IEEE Transactions on Communications,1997,45(10):1260-1268.
[30]Wilson S K,Armstrong J.Transmitter and receiver methods for improving asymmetrically-clipped optical OFDM[J].IEEE Transactions on Wireless Communications,2009,8(9):4561-4567.
[31]Dimitrov S,Sinanovic S,Haas H.Clipping noise in OFDM-based optical wireless communication systems[J].IEEE Transactions on Communications,2012,60(4):1072-1081.
© 2004-2018 中国地质图书馆版权所有 京ICP备05064691号 京公网安备11010802017129号 地址：北京市海淀区学院路29号 邮编：100083 电话：办公室：(+86 10)66554848；文献借阅、咨询服务、科技查新：66554700 |