Correcting The Frequency Deviation And Time-Sensitive Telecommunications Smt
A multi-carrier communication system of the disadvantages is sensitivity to synchronization errors. These systems are more sensitive than single carrier systems are synchronization errors. The most important of these errors can be noted when the error frequency and error. Frequency deviation due to the difference between the oscillation frequency transceiver devices or Doppler shift occurs due to the occurrence of the phenomenon. The resources can be offset by the delay in receiving the signal in the receiver's publishing phenomenon. One of the other problems systems, sensitivity to received signal is frequency shift. This could be due to the frequency difference between the transmitter and receiver oscillators or caused by time-dependent channels. In this paper, multi-carrier communication systems and their structure is checked. After the introduction of SMT, impact, estimating and correcting deviations in the system investigated. To estimate the frequency deviation and the time before the DFT, SMT system can be intermittent or continuous auxiliary data can be used. However, estimates of frequency deviation using auxiliary data after DFT is desirable alternative. This method applies to systems SMTMA mode range is limited, but the disadvantages of this method is to estimate the frequency deviation. On the other hand, however, the method of estimating the frequency deviation and the time before the DFT auxiliary data can be generalized to non-periodic SMTMA system, but the frequency deviation estimator performance was not desirable.
BRSaltzberg, Performance of an efficient parallel data transmission system, IEEE Trans. Commun. Tech, vol. 15, no. 6, pp. 805-811, Dec. 1967.
T.AWeiss, J.Hillenbrand, A.Krohn and FKJondral, Mutual interference in OFDM-based spectrum pooling systems, in Proc.IEEE Veh.Tech- nol.Conf.Spring, vol.4, pp.1872-1877 2004.
P. Amini, R. Kempter and B.Farhang-Boroujeny, A comparison of alternative filterbank multicarrier methods for cognitive radio systems, Software Defined Radio Technical Conf. (SDR), pp.13-17, Nov. 2006.
S.Pasupathy, Minimum shift keying: A spectrally efficient modulation, IEEE Commun.Mag, Vol.17, no.4, pp.14-22, Jully 2009.
S.Brandes, I.Cosovic and M.Schnell, Sidelobe supression in OFDM systems by insertion of cancellation carriers, in Proc.62nd IEEE Veh.Technol.Conf. - Fall, vol.1, pp.152-156, Sept.2005.
S, Haykin, Cognitive Radio: brain-empowered wireless communications, IEEE journal on selected areas in Comm, Vol.23, pp.201-220, Feb.2006.
B.Hirosaki, An Orthogonally Multiplexed QAM System Using the Discrete Fourier Transform, IEEE Trans. Commun, vol. 29, no.7, pp. 982 - 989, July 1981.
T.Fusco, A.Petrella and M.Tanda, Sensitivity of multi-user filter-bank multicarrier systems to synchronization errors, in Proc. IEEE ISCCSP, pp. 393-398, Mar. 2008.