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Evaluation of an Efficient Channel Estimator for the STTD Schemes  

Kim, Seong-Hwan (Department of Control System Engineering, Mokpo National University)
Na, Cheol-Hun (Department of Information and Communication Eng., Mokpo Nat. University)
Ryoo, Sang-Jin (Department of Computer Media, Hanyeong College)
Hwang, In-Tae (School of Electronics & Computer Engineering, Chonnam University)
Publication Information
Journal of information and communication convergence engineering / v.5, no.3, 2007 , pp. 185-193 More about this Journal
Abstract
This paper evaluates the performance combining space-time transmit diversity (STTD) and an efficient channel estimator (ECE) for wideband code division multiple access (WCDMA) systems in various mobile channels. Using decision variable (DV), we also derive the analytic bit error rate (BER) and mean square error (MSE) for WCDMA applying ECE for STTD schemes. The simulation results show that the ECE performance is superior to the previous works in [1] as because we use additional pilot diversity which is so called secondary common control physical channel (S-CCPCH). The performance in case of the channel estimator using only one-channel or two-channel is worse than that of an ECE as about the maximum 4 dB at BER 1.0E-3 satisfying voice service over Rician fading channel. Our results show that, even with ICE, an ECE algorithm are effective in improving the output SNR and significantly reduce the error floor. In addition, the simulation results investigated in this paper also reveal that WCDMA combining an ECE and the STTD scheme could provide appreciable performance improvements in Rayleigh fading channel.
Keywords
STTD; channel estimation; WCDMA;
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