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Frequency Domain Turbo Equalization for Multicode DS-CDMA in Frequency Selective Fading Channel  

Lee, Jun-Kyoung (연세대학교 전기전자공학과 이동통신 연구실)
Lee, Taek-Ju (연세대학교 전기전자공학과 이동통신 연구실)
Chae, Hyuk-Jin (연세대학교 전기전자공학과 이동통신 연구실)
Kim, Dong-Ku (연세대학교 전기전자공학과 이동통신 연구실)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.33, no.1C, 2008 , pp. 102-109 More about this Journal
Abstract
The higher data rate of mobile communications has been required for various multimedia services. In DS-CDMA system, one of the solutions to increase the throughput is to use multicode. However, multipath channel destorys the orthogonality of spreading codes, which causes the intercede interference(ICI). ICI gives severe effect on multicode DS-CDMA for BER performance. Conventionally, multicode DS-CDMA system uses the Rake receiver with turbo code, which cannot overcome error floor caused by ICI. In this paper, we propose frequency domain turbo equalization based on minimum mean squared error(FDTE-MMSE) for multicode DS-CDMA in frequency selective channel and evaluate its BER performance by computer simulation. The simulation results show that FDTE-MMSE gives much better performance in high Eb/N0 than the Rake receiver with turbo code in multipath length L>1.
Keywords
Multicode DS-CDMA; Intercede interference; Frequency domain turbo equalization;
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