Modeling of Amplitude Characteristic in Radio Channels of Code Division Multiple Access Systems
https://doi.org/10.31854/1813-324X-2020-6-2-30-38
Abstract
In CDMA radio access systems, amplitude distortions in a nonlinear amplifier (NA) of a group signal lead to bit errors at the outputs of subscriber channels. To assess the permissible distortion limits and their influence on the transmission quality of subscriber signals, an electronic model of the amplitude characteristic (AC) and analytical relations are needed that relate the probability of an error when registering the output signal of the communication channel with the nonlinearity of the AC NA and other destabilizing factors. The article compares alternative mathematical models of AC NA. In contrast to traditional methods of analysis, usually limited to the choice of models with fixed parameters, a method for variably determining the parameters of AC is considered. The results are: a comparison of known methods for approximating the AC of broadband nonlinear power amplifiers of radio signals is given, an algorithm for selecting model parameters for CDMA systems with QAM using the Rapp model is proposed.
About the Authors
V. .. Gurevich
The Bonch-Bruevich Saint-Petersburg State University of Telecommunications
Russian Federation
Russian Federation
S. .. Egorov
The Bonch-Bruevich Saint-Petersburg State University of Telecommunications
Russian Federation
Russian Federation
References
1. Гуревич В. Э., Егоров C. Г. Нелинейные искажения группового сигнала в радиосистеме абонентского доступа // Инфокоммуникационные технологии. 2012. Т. 10. № 3. С. 79-82.
2. Гуревич В. Э., Егоров С. Г. Исследование нелинейных искажений радиосигнала в системе CDMA с квадратурно-амплитудной модуляцией // Информационно-управляющие системы. 2015. № 5(78). С. 106-115. DOI:10.15217/issn1684-8853.2015.5.106
3. Спилкер Дж. Цифровая спутниковая связь: пер. с англ. М.: Связь, 1979. 592 с.
4. Jeruchim M.C., Balaban P., Shanmugan K.S. Simulation of Communication Systems. Modeling, Methodology and Techniques. New York: Kluwer academic, 2002. 907 p.
5. Minkoff J. The Role of AM-to-PM Conversion in Memoryless Nonlinear Systems // IEEE Transactions on Communications. 1985. Vol. 33. Iss. 2. PP. 139-144. DOI:10.1109/TCOM.1985.1096262
6. Евтянов С.И. Радиопередающие устройства. М.: Связьиздат, 1950. 643 с.
7. Бруевич А.Н., Евтянов С.И. Аппроксимация нелинейных характеристик и спектры при гармоническом воздействии. М.: Советское Радио, 1965. 344 с.
8. Voros J. Modeling and identification of Wiener systems with two-segment nonlinearities // IEEE Transactions on Control Systems Technology. 2003. Vol. 11. Iss. 2. PP. 253-257. DOI:10.1109/TCST.2003.809238
9. Gerakoulis D., Geraniotis E. CDMA: Access and Switching for Terrestrial and Satellite Networks. Chichester: John Wiley & Sons, 2001. 280 p. DOI:10.1002/0470841699.fmatter_indsub
10. Rapp C. Effects of HPA-Nonlinearity on a 4-DPSK/OFDM-Signal for a Digitial Sound Broadcasting System // Proceeding of the Second European Conference on Satellite Communications (ECSC-2, Liege, Belgium, 22-24 October 1991). Paris: ESA, 1991. PP. 179-184.
11. Cann A.J. Nonlinearity Model with Variable Knee Sharpness // IEEE Transactions on Aerospace and Electronic Systems. 1980. Vol. AES-16. Iss. 6. PP. 874-877. DOI:10.1109/TAES.1980.309016
12. Honkanen M., Pollanen O., Tanskanen J., Jarvinen E., Haggman S.-G. Comparison of measured and simulated π/4-DQPSK adjacent channel power using a functional high power amplifier model // Proceeding of the 48-th Vehicular Technology Conference. Pathway to Global Wireless Revolution (VTC 98, Ottawa, Canada, 21 May 1998). IEEE, 1998. Vol. 3. PP. 2459-2463. DOI:10.1109/VETEC.1998.686201
13. Honkanen M., Haggman S.-G. New aspects on nonlinear power amplifier modeling in radio communication system simulations // Proceedings of 8th International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC '97, Helsinki, Finland, 1-4 September 1997). IEEE, 1997. Vol. 3. PP. 844-848. DOI:10.1109/PIMRC.1997.627005
14. Saleh A.A.M. Frequency-Independent and Frequency-Dependent Nonlinear Models of TWT Amplifiers // IEEE Transactions on Communications. 1981. Vol. 29. Iss 11. PP. 1715-1720. DOI:10.1109/TCOM.1981.1094911
15. Falconer D., Kolze T., Leiba Y. Proposed System Impairment Models // IEEE 802.16 Broadband Wireless Access Working Group. 2000.
16. Kaye A., George D., Eric M. Analysis and Compensation of Bandpass Nonlinearities for Communications // IEEE Transactions on Communications. 1972. Vol. 20. Iss. 5. PP. 965-972. DOI:10.1109/TCOM.1972.1091254
17. White G.P., Burr A.G., Javornik T. Modelling of nonlinear distortion in broadband fixed wireless access systems // Electronics Letters. 2003. Vol. 39. Iss. 8. PP. 686-687. DOI:10.1049/el:20030462
18. Ghorbani A., Sheikhan M. The effect of solid state power amplifiers (SSPAs) nonlinearities on MPSK and M-QAM signal transmission // Proceedings of the Sixth International Conference on Digital Processing of Signals in Communications (Loughborough, UK, 2-6 September 1991). IET, 1991. PP. 193-197.
19. Фихтенгольц Г.М. Курс дифференциального и интегрального исчисления. Том 1. М.: Наука, 1966, 608 с.
Review
For citations:
Gurevich V..., Egorov S... Modeling of Amplitude Characteristic in Radio Channels of Code Division Multiple Access Systems. Proceedings of Telecommunication Universities. 2020;6(2):30-38. (In Russ.) https://doi.org/10.31854/1813-324X-2020-6-2-30-38
Views:
2079
Email this article 