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Performance Comparison and Analysis of SC-FDMA Systems employing IB-DFE  

Cho, Jae-Deok (고려대학교 전자및정보공학과 신호처리연구실)
Ahn, Sang-Sik (고려대학교 전자및정보공학과)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.34, no.9C, 2009 , pp. 906-914 More about this Journal
Abstract
SC-FDMA is employed in the 3GPP-LTE standard as the uplink transmission scheme. SC-FDMA has advantages that the signal has a low PAPR property and a simple equalizer such as FD-LE can be implemented. But FD-LE has inferior performance to Hybrid-DFE composed of frequency-domain feedforward filter and time-domain feedback filter. Recently, several IB-DFE algorithms have been proposed to overcome the disadvantages of implementation and processing complexity of Hybrid-DFE and to obtain superior performance to FD-LE. In this paper, we apply several IB-DFE algorithms to 3GPP-LTE uplink system and compare their performance by calculating BER. We investigate the effects of channel estimation errors and Doppler shift on performance. Finally, by analyzing computational complexity of IB-DFEs, we present some criteria to choose appropriate algorithm and to decide the number of iterative processes.
Keywords
SC-FDMA; 3GPP-LTE; Channel Estimation; IB-DFE;
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