Article

Article title RESEARCH OF MODEL OFDM-SIGNAL WITH SMALL LEVEL OF OUT-OF-BAND RADIATION
Authors V.P. Fedosov, D.G. Kovtun, A.A. Legin, A.V. Lomakina
Section SECTION I. METHODS AND ALGORITHMS FOR SIGNAL PROCESSIN
Month, Year 11, 2015 @en
Index UDC 004.93’12, 004.93’14
DOI
Abstract The article presents the process of forming and analysis of OFDM-signal model with low- band radiation, ensure the selection of the parameters of a raised cosine window and the number of subcarriers in the formation of the guard interval. To explain the essence of forming model OFDM-signal (Orthogonal frequency-division multiplexing), justification of the method and iden- tify the effects of lowering of-band radiation is a description of the formation of the model and source of the radiation-band signal based on multipath its distribution channel radio. Research of the influence of the level-of-band radiation as a function of the length of the recession of the win- dow of the "raised cosine" in relation to the duration of the guard interval of the OFDM symbol is made on an example of OFDM-symbol having 1024 subcarriers. Among these 400 subcarriers are protective, and the remaining 624 subcarriers information. Because of the guard interval and window treatment, broadband multipath fading appears in an OFDM as the number of narrow-band subcarriers freezes without ICI and ISI. Single remainder effect of multipath is the random phase and amplitude at the subcarrier. Investigation of the effect on the duration of the guard interval band emission level duration of the window function is chosen to be the length of the cy- clic prefix, since it provides the lowest-band radiation. The duration of the prefix chosen equal 1/128, 1/16, 1/4, respectively. Analysis of the results showed that the longer the guard interval, the lower the out of band radiation. As a result of studies have shown that the level-of-band emission is reduced by 15 dB with respect to the boundaries of the detuning frequency band allocated for the communication channel at 0,75 MHz.

Download PDF

Keywords Orthogonal frequency consolidation; OFDM; interference; out-of-band radiation; carrier; subcarriers; pilot-signals.
References 1. Zou W.Y., Wu Y. COFDM An overview, IEEE Trans Broadcast, March 1995, Vol. 41, pp. 1-8.
2. Rohling H., May T., Bruninghaus K., Grunheid R. Broad-band OFDM radio transmission for multimedia applica1ions, Pmc. IEEE, Oct. 1999, Vol. 87, pp. 1778-1788.
3. O’Neill R., Lopes L.N. Envelope variation and spectral splatter in clipped multicarrier signals, IEEE PIMRC, Sept. 1995, pp. 71-75.
4. Li X., Cimini L. J. Effects of clipping and filtering on the performance of OFDM, IEEE Commun. Le, Vol. 2, pp. 131-133.
5. Awaler G.A., van Nee R. Implementation of the magic WAND wireless ATM modem, IEEE GLOBECOM, 1999, pp. 1-6.
6. Pauli M., Kuchenbebecker H. P. On the reduction of the out-of-band radiation of OFDM signals, IEEE ICC (New York, NY, USA), 1998, pp. 1304-1038.
7. Speth M. OFDM receivers for broadband-transmission. April 1999. Available at: http://www.ert.rwth-aachen.de/Projekte/Theo/OFDM/www_ofdm.html.
8. Kocan E., Djurisic M.P., Veljovic Z. Efficient Frequency Synchronization and Channel Estimation: Method for OFDM Wireless Systems, IEEE, 2010, pp. 487-491.
9. ETSIEN 300 744. – V1.6.1 – (2009-01): «Digital Video Broadcasting (DVB): Framing structure, channel coding and modulation for digital terrestrial television», pp. 80.
10. Glover I., Grant P. Digital Communications (2-nd ed.). Pearson Education Ltd, 2004, 1025 p. ISBN 0-13-089399-4.
11. Proakis J. Digital Communications (3rd ed.). McGraw-Hill Inc., 1995, 1150 p. ISBN 0-07-113814-5.
12. Van Nee R., Prasad R. OFDM for Mobile Multimedia Communications. Boston, Artech House, 2000. – 260 p. ISBN 0-89-006530-6.
13. Van Nee R., Awater G., Morikura M., Takanashi H., Webster M., Helford K. New high rate wireless LAN standards, IEEE Communications Magazine, Dec. 1999, pp. 1025.
14. Fedosov V.P., Legin A.A., Lomakina A.V. Algoritmy, osnovannye na tekhnologii MIMO-OFDM, dlya realizatsii tsifrovogo gidroakusticheskogo kanala svyazi [The algorithm is based on MIMO-OFDM technology for the realization of digital hydroacoustic communication channel], Izvestiya YuFU. Tekhnicheskie nauki [Izvestiya SFedU. Engineering Sciences], 2015, No. 7 (168), pp. 148-158.
15. Fedosov V.P., Emel'yanenko A.V. Issledovanie i korrektsiya funktsii neopredelennosti tsifrovogo televizionnogo signala OFDM [The study and correction of the ambiguity function of a digital television signal OFDM], Materialy Vserossiyskoy nauchnoy konferentsii «Aktual'nye problemy sovremennosti: chelovek, obshchestvo, tekhnika» [Materials of all-Russian scientific conference "Actual problems of modernity: people, society, technology"]. Taganrog: Izd-vo TTI YuFU, 2012. Part 4, pp. 15-22.
16. Fedosov V.P., Lomakina A.V., Legin A.A. Modelirovanie sistemy besprovodnoy peredachi dannykh na osnove antennykh reshetok v podvodnom akusticheskom kanale [The simulation system of wireless data transmission based on antenna arrays in underwater acoustic channel], Trudy Mezhdun. nauchn. konf. «Izluchenie i rasseivanie EMV – IREMV-15» [Proceedings of
International scientific conference "Radiation and scattering of emws – IRANG-15"]. Rostov-on-Don: Izd-vo YuFU, 2015, pp. 721-725.
17. Fedosov V.P., Emel'yanenko A.V. Ustoychivost' k oshibkam v otsenke vesovykh vektorov adaptivnogo prostranstvenno-vremennogo algoritma radiosvyazi na antennykh reshetkakh v releevskom kanale [Stability to errors in the estimation of weight vectors of adaptive existential algorithm of the radio communication on antenna lattices in the relei’s channel], Izvestiya YuFU.
Tekhnicheskie nauki [Izvestiya SFedU. Engineering Sciences], 2013, No. 11 (148), pp. 37-44.
18. Fedosov V.P., Emel'yanenko A.V. Sravnitel'naya effektivnost' besprovodnogo dostupa na osnove prostranstvennoy adaptatsii na vykhodakh antennoy reshetki pri ispol'zovanii MIMO OFDM v releevskom kanale [Comparative efficiency of wireless access on the basis of spatial adaptation at the outputs of the antenna array using MIMO OFDM in Rayleigh channel],
Antenny [Antennas], 2013, No. 10, pp. 45-49.
19. Fedosov V.P., Emel'yanenko A.V., Gladushenko S.G., Pomortsev P.M. Metody i algoritmy mnogokanal'noy prostranstvennoy obrabotki shirokopolosnykh signalov [Methods and algorithms of multichannel processing of broadband signals], Nelineynyy mir [Nonlinear World], 2012, No. 11, pp. 731-737.
20. Fedosov V.P., Emelyanenko A.V., Ternovaya N.O., Rubtsov R.V., Marchuk V.I. Adaptive algorithm for MIMO-system of the wireless access for the receiver of the mobile station, Proceedings of 2014 IEEE 41th International Conference on signal processing, Hang Zhou, 2014, pp. 1537-1541. ISBN: 978-146732194-5.

Comments are closed.