By Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions; Antonopoulos, Angelos; Kartsakli, Elli; Alonso Zárate, Luis Gonzaga; Verikoukis, C
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Viterbi, A. J. and Viterbi, A. M. (1983). Nonlinear Estimation of PSK-Modulated Carrier Phase with Application to Burst Digital Transmission, IEEE Trans. Inform. 3, (July 1983), pp. 543-551, ISSN : 0018-9448. C 1. Introduction Recently, orthogonal frequency division multiplexing (OFDM) techniques have received great interest in wireless communications for their high speed data transmission. OFDM improves robustness against narrowband interference or severely frequency-selective channel fades caused by long multipath delay spreads and impulsive noise.
Komaki, S. & Morinaga, N. (1996). Optimum synchronization of orthogonal multi-carrier modulated signals, Proceedings of IEEE Personal, Indoor and Mobile Radio Communications Conference, 1996 (PIMRC’96), Taipei, Taiwan, pp. , Kang, C. & Hong, D. (2001). 83-85. Popovic, B. M. (1992). , Sandell, M. & Borjesson, P. O. (1997). 7, (July 1997), pp. , Grieco, D. & Ozluturk, F. (2007). 23-29 Warner, W. D. & Leung, C. (1993). , Wang, W. & Yang, Y. (2010). 88-93 3 ICI Reduction Methods in OFDM Systems Nadieh M.
The CP usually repeats the last L samples of an OFDM block and then is arranged in front of the block. The resulting symbol sn can be represented as , ⎧x sn = ⎨ N + n x , ⎩ n n = −L , −L + 1, n = 0,1, , −1 ,N − 1 (3) The transmitted signal may pass through a channel h depending on the environments. The receiver signal rn can be written as rn = sn ⊗ h + w (4) where w denotes the additive white Gaussian noise (AWGN). The data symbol Yn can be recovered by using a DFT operation and is determined as Yn = 1 N −1 ∑ y k e j 2π kn N k =0 N , n = 0,1, ,N - 1 (5) Fig.