Abstract
This paper discusses an adaptive modulation technique combined with space-frequency block coded OFDM(SFBC OFDM) over frequency selective channels and evaluates the performance in terms of the outdated channel state information(CSI) in mobile environments. This paper employs the Alamouti’s diversity scheme in multiple input multiple output OFDM (MIMO OFDM) and an adaptive modulation with enhanced performance. Adaptive modulation scheme shows very attractive performance when the CSI is perfect. The CSI for bit loading in MIMO OFDM can be obtained from the singular value decomposition(SVD) of MIMO channel. But, SFBC OFDM system based on Alamouti’s diversity scheme does not require the SVD process. Through various simulations, the performance of SFBC OFDM employing adaptive modulation is compared with that of fixed modulation. Also, in adaptive modulation scheme, the effects of the outdated CSI under mobile environments are shown
Chapter PDF
Similar content being viewed by others
Keywords
- Orthogonal Frequency Division Multiplex
- Singular Value Decomposition
- Channel State Information
- Orthogonal Frequency Division Multiplex System
- MIMO Channel
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
References
Keller, T., Hanzo, L.: Adaptive multicarrier modulation: a convenient framework for time-frequency processing in wireless communications. Proc. Of the IEEE 88, 611–640 (2000)
Alamouti, S.M.: A simple transmit diversity technique for wireless communications. IEEE J, Select. Areas Comm. 16, 1451–1458 (1998)
Lee, K.F., Williams, D.B.: A space-time coded transmitter diversity technique for frequency selective fading channels. In: Proc. of the 2000 IEEE, SAMSP workshop, pp. 149–152 (2000)
Bolcskei, H., Paulraj, A.: Space-frequency coded broadband OFDM systems. In: Proc. Of Wireless Comm., September 2000, pp. 1–6 (2000)
Liu, Z., Xin, Y., Giannakis, G.B.: Space-time-frequency coded OFDM over frequency-selective fading channels. IEEE Trans. Sig. Proc. 50, 2465–2476 (2002)
Chow, P.S., Cioffi, J.M., Bingham, J.A.C.: A practical discrete multi-ton transceiver allocation algorithm for data transmission over spectrally shaped channels. IEEE Trans. on Comm. 43, 773–775 (1995)
Chung, S.T., Goldsmith, A.J.: Degrees of freedom in adaptive modulation: a unified view. IEEE trans. On Comm. 49, 1561–1571 (2001)
Ye, S., Blum, R.S., Cimini, L.L.: Adaptive modulation for variable-rate OFDM systems with imperfect channel information. In: Ye, S., Blum, R.S., Cimini, L.L. (eds.) Proc. VTC 2002, pp. 767–771 (2002)
Patzold, M.: Mobile Fading Channels. Wiley, Chichester (2002)
Author information
Authors and Affiliations
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2006 Springer-Verlag Berlin Heidelberg
About this paper
Cite this paper
Hwang, T.J., Park, S.S., Hwang, H.S. (2006). An Efficient Bit Loading for OFDM with Diversity Scheme over Mobile Channel. In: Cuenca, P., Orozco-Barbosa, L. (eds) Personal Wireless Communications. PWC 2006. Lecture Notes in Computer Science, vol 4217. Springer, Berlin, Heidelberg. https://doi.org/10.1007/11872153_36
Download citation
DOI: https://doi.org/10.1007/11872153_36
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-540-45174-7
Online ISBN: 978-3-540-45176-1
eBook Packages: Computer ScienceComputer Science (R0)