Chi-Min Li
ABSTRACT
The well-known diversity technique, space-time block codes (STBC) can be employed at both the transmitting and receiving ends to increase the system capacity. Besides, RAKE receiver is widely used in wideband code division multiple access (W-CDMA) system to combat the multipaths fading. RAKE receiver can co-phase the multipaths signals and add these signals to form the coherent output in the temporal domain. Because of the spatial and temporal diversity features, the combination of STBC and RAKE receiver is expected to have further system improvement when the channel estimation is perfect. In this paper, we will derive an analytical result on system degradation in terms of signal interference noise ratio (SINR) of the STBC-RAKE receiver when channel estimation is imperfect in real practice. Besides, we will also propose an easy and analytic method to improve this degradation. Experimental measured examples are presented to analyze the system degradation and verify the effectiveness of the proposed method.
- S. M. Alamouti, "A simple transmit diversity technique for wireless communications," IEEE Journal on Selected Areas in Communications, vol. 16, no. 8, pp. 1451--1458, 1998. Google Scholar
Digital Library
- 3rd Generation Partnership Project (3GPP), 'Spreading and Modulation (FDD)', Tech. Rep. TS 25.213 V2.0.0 (1999-4)Google Scholar
- Hassan M. EI-Sallabi, Henrry L. Bertoni, and Petti Vainikainen, "Experimental Evaluation of RAKE Finger Life Distance for CDMA System", IEEE Antennas and Wireless Propagation Letters, Vol. 1, 2002.Google Scholar
- A. F. Naguib, N. Seshadri, and A. R. Calderbank, "Increasing data rate over wireless channels," IEEE Signal Processing Magazine, vol. 17, no. 3, pp. 76--92, 2000.Google ScholarCross Ref
- S. X. Ng, L. L. Yang, T. H. Liew and L. Hanzo, "Space-Time Coding-Assisted Double-Spread Rake Receiver-Base CDMA for Dispersive Rayleigh Fading Environments", Vehicular Technology Conference, 2002. Volume: 4 , 6-9 May 2002, Pages:1670 -- 1674Google Scholar
Index Terms
- An analytic method to improve the performance of a space-time block codes RAKE receiver with channel estimation error
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