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Efficient and robust decision delays selection scheme for multiuser MIMO DFE in power imbalance situation

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Abstract

Recently, it has been shown that the selection of decision delays has a crucial effect on the performance of finite-length multiple-input multiple-output decision-feedback equalization (MIMO-DFE) receiver for multiuser time division multiple access (TDMA) system. With the minimum joint-BER (MJB) criterion, choosing the optimum different decision delays for individual uplink users would require multi- dimensional searching, which is too costly for real-time applications. In this paper, we propose an efficient power-ratio-based (PRB) scheme to solve the multiuser decision delay problem in practice. First, it employs the MIMO channel responses to calculate the received power ratios among uplink users. The ratios are then compared to a set of preset thresholds to determine the decision delays. To optimize the thresholds, Gaussian approximation (GA) technique is used for speeding up the off-line searching process. Under power imbalance situation, we note that the decision delays must be carefully selected on a burst-by-burst basis, or else the performance loss for the weaker users would be very significant. Hence, both the MJB and PRB methods can resist the near-far effect. Finally, simulation results show that the proposed PRB scheme has an approximate BER performance, but with much reduced computational complexity, as compared to the optimal MJB one.

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Authors and Affiliations

  1. Communication Signal Processing Laboratory, Department of Communications Engineering, Yuan-Ze University, Taiwan, 32003, R.O.C

    Jeng-Kuang Hwang & Rih-Lung Chung

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  1. Jeng-Kuang Hwang
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  2. Rih-Lung Chung
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Correspondence to Jeng-Kuang Hwang.

Additional information

The research work was supported by the National Science Council, R.O.C., under the Grant NSC 90-2213-E-155-012, and NSC 91-2213-E-155-040.

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Hwang, JK., Chung, RL. Efficient and robust decision delays selection scheme for multiuser MIMO DFE in power imbalance situation. Wireless Pers Commun 43, 1291–1302 (2007). https://doi.org/10.1007/s11277-007-9302-3

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  • DOI: https://doi.org/10.1007/s11277-007-9302-3

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