Browse > Article

An Optimal Determination of Subband-Frame Size and Mode Switching Level for Adaptive OFDM-TDD System  

Shin Kil-Ho (한국과학기술원 전기 및 전자공학과)
Lee Chang-Suk (한국과학기술원 전기 및 전자공학과)
Kim Jung-Gon (한국과학기술원 전기 및 전자공학과)
Kim Hyung-Myung (한국과학기술원 전기 및 전자공학과)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.30, no.6C, 2005 , pp. 512-522 More about this Journal
Abstract
In this paper, an optimal determination method of the subband-frame size and mode-switching level is proposed for adaptive OFDM-TDD systems in frequency-selective time-varying channels. The optimization problem considering frequency selectivity. user's mobility, and the signaling overhead caused by the mode change information is formulated in the maximum spectral efficiency sense satisfying the target BER. Assuming that subband-frame size is given, the mode-switching level is first optimized so that the spectral efficiency can be maximized satisfying the target BER. The subband-frame size among candidates is then determined, which maximizes the spectral efficiency. Simulation results show that the proposed scheme outperforms conventional schemes, in terms of the spectral efficiency and the BER.
Keywords
Adaptive OFDM; subband-frame size; mode switching level; rms delay spread; Doppler frequency;
Citations & Related Records
연도 인용수 순위
  • Reference
1 J. A. C. Bingham, 'Multicarrier modulation for data transmission: An idea whose time has come,' IEEE Commun. Mag., vol. 28, pp. 5-14, May 1990   DOI   ScienceOn
2 S. T. Chung and A. J. Goldsmith, 'Degrees of freedom in adaptive modulation: A unified view,' IEEE Trans. Commun., vol. 49, pp. 1561-1571, Sep. 2001   DOI   ScienceOn
3 B. J. Choi and L. Hanzo, 'Optimum mode-switching-assisted constant-power single- and multicarrier adaptive modulation,' IEEE Trans. Veh. Technol., vol. 52, pp. 536-560, May 2003   DOI   ScienceOn
4 C. Tepedelenlioglu and G. B. Giannakis, 'On velocity estimation and correlation properties of narrow-band mobile communication channels,' IEEE Trans. Veh. Technol., vol. 50, pp. 1039-1052, July 2001   DOI   ScienceOn
5 L. J. Cimini, 'Analysis and simulation of a digital mobile channel using orthogonal frequency division multiplexing,' IEEE Trans. Commun., vol. 33, pp. 665-675, July 1995   DOI
6 W. T. Webb and R. Steele, 'Variable rate QAM for mobile radio,' IEEE Trans. Commun., vol. 43, pp. 2223-2230, July 1995   DOI   ScienceOn
7 L. Hanzo, C. Wong, and M. Yee, Adaptive Wireless Transceivers. New York: Wiley; IEEE Press, 2002
8 M. S. Varela and M.G. Sanchez, 'RMS delay and coherence bandwidth measurements in indoor radio channels in the UHF band,' IEEE Trans. Veh. Technol., vol. 50, pp. 515-525, Mar. 2001   DOI   ScienceOn
9 L. Hanzo, W. Webb, and T. Keller, Single and Multi-Carrier Quadrature Amplitude Modulation. New York: Wiley; IEEE Press, 2000
10 J. K. Cavers, 'An analysis of pilot symbol assisted modulation for Rayleigh fading channels,' IEEE Trans. Veh. Technol., vol. 40, pp. 686-693, Nov. 1991   DOI   ScienceOn
11 Y. Li, L. J. Cimini Jr., and N. R. Sollenberger, 'Robust channel estimation for OFDM Systems with rapid dispersive fading channels,' IEEE Trans. Commun., vol. 46, pp. 902-915, July 1998   DOI   ScienceOn
12 T. Keller and L. Hanzo, 'Adaptive modulation techniques for duplex OFDM transmission,' IEEE Trans. Veh. Technol., vol. 49, pp. 1893-1906, Sep. 2000   DOI   ScienceOn
13 R. Grunheid, E. Bolinth, and H. Rohling, 'A blockwise loading algorithm for the adaptive modulation technique in OFDM systems,' in Proc. Veh. Technol. Conf. 2001 Fall, vol. 2, pp. 948-951, Oct. 2001
14 J. F. Hayes, 'Adaptive feedback communications,' IEEE Trans. Commun. Technol., vol. 16, pp. 29-34, Feb. 1968   DOI