DD-KBÇE İletişim Sistemlerinin Farklı Yayma Kodları İçin Weibull Sönümlü Kanaldaki Bit Hata Oranı Başarım Analizleri

Kablosuz iletişim sistemleri günümüz araştırma ve geliştirme alanlarının en dinamik olanlarından birisidir. Son yıllarda çok popüler olan kablosuz iletişim teknolojilerinden birisi doğrudan dizili kod bölmeli çoklu erişim (DDKBÇE) sistemidir. Bu çalışmada DD-KBÇE iletişim sistemlerinin bit hata oranı (BHO) başarımları, bina içi ve bina dışı ortamlarda çok yollu yayılıma sahip sönümlemeli kanalların tanımlanabilmesi için önerilmiş uygun bir istatistiksel model olan Weibull sönümlü kanallar üzerinden analiz edilmiştir. İletişim sistemlerinin BHO başarımları hem Gold ve Walsh-Hadamard kodları gibi iki farklı yayma kodu kullanılarak hem de Weibull sönümlenmeli kanalın sönümleme parametreleri değiştirilerek elde edilmiştir. Farklı kullanıcı sayıları için gerçekleştirilen başarım analizleri sonucunda Walsh-Hadamard yayma kodlarının artan kullanıcı sayılarında Gold kodlarından oldukça üstün oldukları görülmüştür.

Bit Error Rate Performance Analyses of DS-CDMA Systems for Different Spreading Codes in Weibull Fading Channels

Wireless communication systems are one of the most dynamic areas of contemporary research and development areas. In recent years, one of the most popular wireless technologies is direct-sequence code division multiple access (DS-CDMA) systems. In this study, the bit error rate (BER) performances of the DS-CDMA systems are investigated over Weibull fading channel model that is proposed as an appropriate fading model to describe multipath fading channels for both indoor and outdoor environments. The BER performances of communication systems are obtained for both by employing two different spreading codes such as Gold and Walsh-Hadamard codes, and by varying the value of fading parameters of the Weibull channel model. Performed simulation results for different user numbers are confirmed that Walsh-Hadamard spreading codes outperform than the Gold codes in the event of increasing user numbers.

PDF

___

Sun S., Han S., Yu Q., Meng W. and Li C., "A survey of two kinds of complementary coded CDMA wireless communications", 2014 IEEE Global Communications Conference, Austin, TX, USA, 468-472, 8-12 Aralık 2014.
Shah S.I., Naeem M., Sheikh A.U.H., Jamal H. and Ahmad J., "A survey of advances in multi-user detection in DS-CDMA", The 4th ACS/IEEE International Conference on Computer Systems and Applications (AICCSA-06), Dubai, Sharjah, UAE, 730-737, 8-11 Mart 2006.
Naqshbandi M.A., "Will CDMA survive the blitz of GSM in the Indian telecom Ecosystem?", International Journal of Research in Computer and Communication Technology, Cilt 2, No 4, 180- 186, 2013.
Nath, N.P., Parija S.R., Sahu P.K., Singh S.S., "Survey paper: location management in CDMA network", International Journal of Grid and Distributed Computing, Cilt 8, No 1, 287-298, 2015.
Ali A.H., "Design and analysis of MC-CDMA transceivers model based Fourier Transform", Journal Applications, Cilt 4, No 9, 109-118, 2014. Engineering and
Hafizi M., Feng S., Fu T.L., Schulze K., Ruth R., Schwab R., Karlsen P., Simmonds D. and Gu Q.Z., "RF front-end of direct conversion receiver RFIC for CDMA", IEEE Journal of Solid-State Circuits, Cilt 39, No 10, 1622-1632, 2004.
Hwang J.S., Consulta R.R. and Yoon H.Y., "4G mobile networks-Technology beyond 2.5G and 3G", Pacific Telecommunications Council (PTC) Proceedings, 2007.
Schilling D.L., "Broadband-CDMA: one phone for a wireless twenty first century", IEEE International Conference Communications, Bangalore, India, 1-5, 18-19 Ağustos 1994. Wireless
Kumar P. and Arvind S., "Advanced contrast between GPRS and CDMA One packet data", 7th Asia-Pacific Symposium on Information and Telecommunication Technologies, Bandos Island, Maldives, 922-927, 22-24 Nisan 2008.
Hertiana S.N., Wahidah I., Magdalena R. and Murti M.A., "PF scheduler algorithm and open loop rate control for performance improvement of CDMA International Conference on Wireless and Optical Communications Networks, Singapore, 1-6, 2-4 Temmuz 2007. 2007 IFIP
Yang G. and Kallel S., "Optimal frame rate detection for CDMA mobile stations with variable- rate data transmission", Fifth Asia-Pacific Conference on Communications and Fourth Optoelectronics and Communications Conference, Beijing, China, 713-716, 18-22 Ekim 1999.
Del Re E., Fantacci R., Morosi S. and Seravalle R., "Comparison of CDMA and OFDM techniques for downstream power-line communications on low voltage grid", IEEE Trans. Power Delivery, Cilt 18, No 4, 1104-1109, 2003.
Babich F., Lombardi G., "Statistical analysis and characterization channel", IEEE Trans. Commun., Cilt 48, No 3, 455-464, 2000. indoor propagation
Tzeremes G., Christodoulou C.G., "Use of Weibull distribution for describing outdoor multipath fading", IEEE Antennas and Propagation Society International Symposium, San Antonio, Texas, USA, 232-235, 16-21 Haziran 2002.
Cvetkovic A.M., Djordjevic G.T., Stefanovic M.C., "Performance analysis of dual switched diversity over correlated Weibull fading channels with co-channel interference", Int. J. Commun. Syst., Cilt 24, No 9, 1183-1195, 2011.
Chen J.I.Z., Liou C.W., Yu C.C., "Error probability analysis of an MC-DS-CDMA system under Weibull fading with a moment-generating function", Comput. Electr. Eng., Cilt 36, No 1, 61- 72, 2010.
Wang P., Qin J., Guo L., Yang Y., "BER performance of FSO limited by shot and thermal noise channels," IEEE Photonics Technol. Lett., Cilt 28, No. 3, 252-255, 2016. Weibull fading
Chauhan S.S., · Kumar S., "Capacity of orthogonal space-time block codes in spatially correlated MIMO Weibull fading channel under various adaptive transmission techniques," Telecommun. Syst., Cilt 62, 101-110, 2016.
Adawi N., Bertoni H.L., Child J.R., "Coverage prediction for mobile radio systems operating in the 800/900 MHz frequency range", IEEE Trans. Veh. Technol., Cilt 37, No 1, 3-72, 1988.
Harada H. and Prasad R., "Simulation and Software Radio for Mobile Communications", Artech House, Boston, Mass, USA, 2002.
Gold R., "Optimal binary sequences for spread spectrum multiplexing", IEEE Inf. Theory, Cilt 13, No 4, 619-621, 2003.
Prasad R., "CDMA for wireless personal communications", Narwood, MA: Artech House, 1996.
Prasad R., "Universal wireless personal communications", Narwood, MA: Artech House, 1996.