MMSE based turbo equalization for chip space-time block coded downlink CDMA

TitleMMSE based turbo equalization for chip space-time block coded downlink CDMA
Publication TypeConference Paper
Year of Publication2005
AuthorsWavegedara, K. C. B., and V. K. Bhargava
Conference NameGlobal Telecommunications Conference, 2005. GLOBECOM '05. IEEE
Pagination1 pp. -3876
Date Publisheddec.
Keywords3G mobile communication, 3G mobile telecommunication, block codes, block spreading, broadband networks, channel coded broadband wireless systems, chip space-time block coded downlink CDMA, code division multiple access, downlink transmission, equalisers, fading channels, iterative equalizer, least mean squares methods, MMSE, multipath channels, multipath fading channels, space-time codes, transmit diversity, turbo equalization

Space-time (ST) block coding based transmit diversity is included in the 3G mobile telecommunication specification for CDMA downlink transmission. On the other hand, turbo (iterative) equalization can be used in channel coded broadband wireless systems to enhance the performance. Hence, in this paper, we develop a linear MMSE-based turbo equalization scheme for downlink ST block coded CDMA to achieve high capacity gains over multipath fading channels. The proposed unified CDMA system model considers both conventional and block spreading. However, block spreading is more desirable as confirmed by the simulation results. Both ST encoding and ST decoding are performed at the chip-block level. Turbo equalization is performed after ST decoding. Furthermore, we also consider computationally-efficient implementations of the proposed turbo equalization scheme. Simulation results demonstrate that high performance can be achieved using the proposed iterative equalizer


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