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Publications (2)0 Total impact

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    Sang-Hoon Lim, Jeonghwa Lee
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    ABSTRACT: We propose a new adaptive beamforming algorithm using the pilot and traffic channel in mobile communication systems. This algorithm updates the weight vector by applying the constant modulus algorithm to traffic channel and the least mean square algorithm to pilot channel. The performance of adaptive beamforming algorithm using pilot channel that is suitable for the cdma2000 reverse link is evaluated by Lim, Yoo and Seongdo Kim (see VTC2001 Spring, May 2000). It updates the weight vector by the complex normalized least mean square algorithm through the pilot channel and applies the weight vector to the traffic channel with the traffic symbol rate. However, it is degraded by the channel estimation error according the change of pilot to traffic power ratio especially in fading channel. Also, since it utilizes only the pilot channel information for weight vector calculation, the information obtained through the traffic channel is discarded. Therefore, we propose a new algorithm using the pilot and traffic channel, which calculates the weight vector more precisely. In addition, the proposed beamforming algorithm has a robust characteristic against channel estimation error.
    Personal, Indoor and Mobile Radio Communications, 2002. The 13th IEEE International Symposium on; 10/2002
  • Sang-Hoon Lim, Jeonghwa Lee, Jongsoo Park
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    ABSTRACT: The performance of an adaptive beamforming algorithm, which uses the pilot channel and is suitable for the cdma2000 reverse link, was evaluated previously (see Lim, S.-H. et al., Proc. VTC2001 Spring, 2001). It updates the weight vector through the complex normalized least mean square algorithm with the pilot channel, and applies the weight vector to the traffic channel at the traffic symbol rate. However, it is degraded by the channel estimation error, especially in a fading channel. Therefore, we propose a new algorithm, using the pilot and traffic channels, which calculates the weight vector more precisely. In addition, the proposed beamforming algorithm has a robust characteristic against channel estimation error. Through simulation, the performance is compared with the previous method, and evaluated.
    Vehicular Technology Conference, 2002. Proceedings. VTC 2002-Fall. 2002 IEEE 56th; 02/2002