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            <title xml:lang="en">A comparative study of frequency domain HARQ chase combining schemes for broadband single carrier MIMO CDMA communication</title>
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                <title level="m">Proceedings IEEE Globecom 2010 Workshop on Broadband Single Carrier and Frequency Domain Communications</title>
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                <term xml:lang="en">Frequency domain turbo equalization</term>
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                <term xml:lang="en">Multi-code CDMA</term>
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              <p>In this paper, we consider two turbo packet combining schemes for cyclic prefix (CP)-CDMA MIMO with Chasetype ARQ: i) In the first scheme, namely chip-level turbo packet combining, minimum-mean-square-error frequency domain equalization (MMSE FDE) and packet combining are jointly performed at the chip-level.ii) In the second scheme, namely symbol-level turbo packet combining, chip-level MMSE FDE and despreading are separately carried out for each transmission, then packet combining is performed at the level of the soft demapper. A comparative study, in term of implementation cost and performance evaluation, is presented. Using complexity analysis and throughput simulations, we demonstrate that the choice of the best combining technique depends on the system configuration.</p>
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