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In orthogonal frequency division multiple access uplink system, orthogonal multiple subcarriers are assigned to different users for parallel high data rate communications. However, carrier frequency offset (CFO), which is due to oscillator mismatches and/or Doppler shift, will destroy the orthogonality among subcarriers and introduce intercarrier interference (ICI) as well as multiple-access interference (MAI). Thus, system performance will be seriously degraded. To overcome this problem, it is of great importance to do research on suppression of the interferences caused by CFO. Especially, for the application services of the fast time-varying WiMAX, LTE and vehicular communication, the most important property of the suppression algorithm of the multiple CFOs effects is the efficient and high speed processing to compensate the ICI as well as MAI due to the multiple CFOs effects. In this paper, we propose a novel fast time domain inverse matrix receiver to suppress the interference of multiple CFOs. Compared with the conventional frequency domain direct ZF inverse matrix method, which has high complexity in obtaining the ICI matrix and its inverse matrix, the proposed method has very low complexity in obtaining the interference matrix. Furthermore, the signal after interference suppression is a frequency domain signal. Thus the FFT processing in conventional receiver can be skipped and receiver complexity can be simplified. Simulation results show that the proposed simple system works very fast and it does not show the serious error floor phenomenon in high SNR range and this algorithm has almost the same performance to the frequency domain direct ZF inverse matrix method.
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Part16: Air interface for fixed and mobile broadband wireless access systems amendment2: Physical and medium access control layers for combined fixed and mobile operation in licensed bands. IEEE Std. 802.16e, 2005.
Pollet, T., Van Bladel, M., & Moeneclaey, M. (1995). BER sensitivity of OFDM systems to carrier frequency offset and Wiener phase noise. IEEE Transactions on Communications, 43, 191–193. CrossRef
Sun, P., & Zhang, L. (2008). A novel pilot aided joint carrier frequency offset estimation and compensation for OFDMA uplink systems. In VTC Spring 2008.
van de Beek, J. J., Borjesson, P. O., Boucheret, M. L., Landstrom, D., Arenas, J. M., Odling, P., et al. (1999). A time and frequency synchronization scheme for multiuser OFDM. IEEE Journal on Selected Areas in Communications, 17, 1900–1914. CrossRef
Morelli, M. (2004). Timing and frequency synchronization for the uplink of an OFDMA system. IEEE Transactions on Communications, 52(2), 296–306. CrossRef
Na, Y., & Minn, H. (2006). Line search based iterative joint estimation of channels and frequency offsets for uplink OFDM systems. IEEE GLOBECOM ’06.
Movahedian, M., Ma, Y., & Tafazolli, R. (2008). An MUI resilient approach for blind CFO estimation in OFDMA uplink. In IEEE 19th international symposium on PIMRC 2008.
Cao, Z., Tureli, U., & Yao, Y.-D. (2004). Deterministic multiuser carrier-frequency offset estimation for interleaved OFDMA uplink. IEEE Transactions on Communications, 52(9), 1585–1594. CrossRef
Fantacci, R., Marabissi, D., & Papini, S. (2004). Multiuser interference cancellation receivers for OFDMA uplink communications with carrier frequency offset. IEEE GLOBECOM ’04 (pp. 2808–2812).
Manohar, S., Sreedhar, D., Tikiya, V., & Chockalingam, A. (2007). Cancellation of multiuser interference due to carrier frequency offsets in uplink OFDMA. IEEE Transactions on Wireless Communications, 6(7), 2560–2571. CrossRef
Nguyen, H. C., De Carvalho, E., & Prasad, R. (2006). Multi-user interference cancellation scheme(s) for muliple carrier frequency offset compensation in uplink OFDMA. In 2006 IEEE 17th international symposium on PIMRC 2006 (pp. 1–5).
Choi, J., Lee, C., Jung, H. W., & Lee, Y. H. (2000). Carrier frequency offset compensation for uplink of OFDM-FDMA systems. IEEE Communications Letters, 4(12), 414–416. CrossRef
Cao, Z., Tureli, U., Yao, Y.-D., & Honan, P. (2004). Frequency synchronization for generalized OFDMA uplink. In IEEE GLOBECOM ’04 (pp. 1071–1075).
Hsu, C.-Y., & Wu, W.-R. (2008). A low-complexity zero-forcing CFO compensation scheme for OFDMA uplink systems. IEEE Transactions on Wireless Communications, 7(10), 3657–3661. CrossRef
Hrycak, T., & Matz, G. (2006). Low-complexity time-domain ICI equalization for OFDM communications over rapidly varying channels. In Fortieth Asilomar conference on signals, signals, systems and computers, 2006. ACSSC ’06 (pp. 1767–1771).
Seo, J.-W., Jang, S.-H, Jeon, W.-G., Paik, J.-H., Kang, M., & Kim, D.-K. (2007). A time-domain ICI canceller using modulation order increasing and repetition coding in OFDM. In Vehicular technology conference 2007 (pp. 2320–2323).
Le, K. N. (2009). Performance bounds on BER of OFDMA with pulse shaping and maximal ratio combining diversity. European Transactions on Telecommunications, 20(5), 487–493. CrossRef
Le, K. N. (2010). BER of OFDM in Rayleigh fading environments with selective diversity. Wireless Communiations and Mobile Computing, 10(2), 306–311.
- A Novel CFO Suppression Algorithm for OFDMA Uplink Communication System
- Springer US