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Double space-time transmit diversity (DSTTD) is currently one of the promising techniques for realizing both spatial diversity and multiplexing gains concurrently. In this paper, in contrast to previous work [6], we consider the performance of double space time transmit diversity (DSTTD) system with multi-user transmitter preprocessing (MUTP) over correlated and uncorrelated frequency-selective fading channels. The transmitter preprocessing (TP) is realized by singular value decomposition (SVD) which exploits the channel state information (CSI) of all the users at the base stations (BSs). This scheme can greatly bring down the complexity of the mobile terminals as well as obviate the need for complex MUDs.Specifically, we investigate the effects of four types of delay spread distributions on MUTP assisted DSTTD system. In a multi-cell scenario, users conflict co-channel interferences (CCI) which can severely degrade the system performance. It is shown through simulation that multi-user transmitter preprocessing (MUTP) can mitigate CCI in addition to retaining the low complexity nature of the mobile terminals. Comparisons for correlated and uncorrelated frequency-selective channels with and without TP are also provided. Keywords-Multiple input multiple output(MIMO), preprocessing, postprocessing, multi-user transmitter preprocessing (MUTP), singular value decomposition (SVD), double space-time transmit diversity (DSTTD), co-channel interference (CCI), multi stream interference (MSI).I.

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This paper studies the performance of joint Vertical Bell Laboratories layered space-time architecture (VBLAST)/Space-Time Block Coding (STBC) aided multipleinput multiple-output (MIMO) system in a multi-cell multi-user setting with multi-user transmitter preprocessing (MUTP) based on singular value decomposition (SVD), which exploits the channel state information (CSI) of all the users at the base stations (BSs) and only individual user's CSI at the mobile stations (MS) for downlink (DL) communication. Specifically, in this contribution, in contrast to previous work [6], we study the effects of four types of delay spread on MUTP assisted joint VBLAST/STBC MIMO system over correlated and uncorrelated frequency-selective channels. In a multi-cell scenario, in addition to multi stream interference (MSI) and multi-user interference (MUI), users conflict co-channel interference (CCI) which can severely degrade the system performance. Simulation studyshows that MUTP can mitigate CCI and MSI with less detection complexity. Comparisons for correlated and uncorrelated frequency-selective channels with and without MUTP are also provided. Keywords-Multiple-input multiple-output(MIMO); preprocessing; post-processing; multi-user transmitter preprocessing (MUTP); singular value decomposition (SVD); cochannel interference (CCI); multi-user interference (MUI); multi stream interference (MSI).