Modeling and performance evaluation of multiuser MIMO systems using real-valued matrices

Pietsch, Christian; Sand, Stephan; Teich, Werner G.; Lindner, J.

doi:10.1109/jsac.2003.810329

Cited by 16 publications

(5 citation statements)

References 14 publications

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“…It is worthwhile to note: 1) The procedure (10)-(12) is well known as the WL processing, which achieves superior performance over strictly linear filters when the signal, interference or noise is improper [21], [22]. In communication systems, the WL algorithm is often employed to process real signals to exploit the signal improperness [15], [23]- [25]. Practical use cases include GSM systems, where the WL algorithm is employed for single-antenna interference cancellation [26]- [28].…”

Section: Formmentioning

confidence: 99%

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A Real–Complex Hybrid Modulation Approach for Scaling Up Multiuser MIMO Detection

Ducoing

et al. 2018

IEEE Trans. Commun.

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In this paper, a novel approach, namely realcomplex hybrid modulation (RCHM), is proposed to scale up multiuser multiple-input multiple-output (MU-MIMO) detection with particular concern on the use of equal or approximately equal service antennas and user terminals. By RCHM, we mean that user terminals transmit their data sequences with a mix of real and complex modulation symbols interleaved in the spatial and temporal domain. It is shown, through the system outage probability, RCHM can combine the merits of real and complex modulations to achieve the best spatial diversity-multiplexing trade-off that minimizes the required transmit-power given a sum-rate. The signal pattern of RCHM is optimized with respect to the real-to-complex symbol ratio as well as power allocation. It is also shown that RCHM equips the successive interference canceling MU-MIMO receiver with near-optimal performances and fast convergence in Rayleigh fading channels. This result is validated through our mathematical analysis of the average biterror-rate as well as extensive computer simulations considering the case with single or multiple base-stations.

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Section: Formmentioning

confidence: 99%

“…Moreover, the approximation in 23is accurate when the outage probabilities for each element are small. Following the procedure in [20], it is trivial to derive from (23) to (21). Lemma 2 shows that the spatial diversity-order of RCHM-MIMO is D RCHM , which fulfills:…”

Section: B Outage Probability and Spatial Diversity-multiplexing Tramentioning

confidence: 99%

A Real–Complex Hybrid Modulation Approach for Scaling Up Multiuser MIMO Detection

Ducoing

et al. 2018

IEEE Trans. Commun.

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“…(e-mail: j.delunaducoing@surrey.ac.uk; n.yi@surrey.ac.uk; y.ma@surrey.ac.uk, r.tafazolli@surrey.ac.uk) the transmitted signals (such as M-ASK), interference, or noise are improper [5], [6], i.e., their pseudo-covariance matrix is not 0. WL processing has been proposed for applications in many contexts, such as CDMA [5], [7], single antenna interference cancellation [8], [9], OFDM [10], space-time codes [11], SISO systems with adaptive constellations [12], and MIMO [4], [13].…”

Section: Introductionmentioning

confidence: 99%

Using Real Constellations in Fully- and Over-Loaded Large MU-MIMO Systems With Simple Detection

Ducoing

et al. 2016

IEEE Wireless Commun. Lett.

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Abstract-The aim of this letter is to exhibit some advantages of using real constellations in large multi-user (MU) MIMO systems. It is shown that a widely linear zero-forcing (WLZF) receiver with M-ASK modulation enjoys a spatial-domain diversity gain, which linearly increases with the MIMO size even in fully-and over-loaded systems. Using the decision of WLZF as the initial state, the likelihood ascent search (LAS) achieves nearoptimal BER performance in fully-loaded large MIMO systems. Interestingly, for coded systems, WLZF shows a much closer BER to that of WLZF-LAS with a gap of only 0.9-2 dB in SNR.Index Terms-Multiple-input multiple-output (MIMO), overloaded, M-ASK, widely linear receiver.

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“…However, in realistic environments, channel correlations exist and affect the system performance. Unfortunately, to the best of our knowledge, only a few papers have considered the performance of multiuser MIMO systems in such correlated fading environments [2], [3].…”

Section: Introductionmentioning

confidence: 99%

Performance Evaluation of Multiuser MIMO E-SDM Systems in Time-Varying Fading Environments

Bui

Ogawa

Nishimura

et al. 2009

IEICE Trans. Commun.

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SUMMARYIn this paper, the performance of multiuser MIMO E-SDM systems in downlink transmission is evaluated in both uncorrelated and correlated time-varying fading environments. In the ideal case, using the block diagonalization scheme, inter-user interference can be completely eliminated at each user; and using the E-SDM technique for each user, optimal resource allocation can be achieved, and spatially orthogonal substreams can be obtained. Therefore, a combination of the block diagonalization scheme and the E-SDM technique applied to multiuser MIMO systems gives very good results. In realistic environments, however, due to the dynamic nature of the channel and processing delay at both the transmitter and the receiver, the channel change during the delay may cause inter-user interference even if the BD scheme is used. In addition, the change may also result in large inter-substream interference and prevent optimal resource allocation from being achieved. As a result, system performance may be degraded seriously. To overcome the problem, we propose a method of channel extrapolation to compensate for the channel change. Applying our proposed method, simulation results show that much better system performance can be obtained than the conventional case. Moreover, it also shows that the system performance in the correlated fading environments is much dependent on the antenna configuration and the angle spread from the base station to scatterers. key words: multiuser MIMO systems, eigenbeam-space division multiplexing E-SDM, channel extrapolation, time-varying fading environments

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Modeling and performance evaluation of multiuser MIMO systems using real-valued matrices

Cited by 16 publications

References 14 publications

A Real–Complex Hybrid Modulation Approach for Scaling Up Multiuser MIMO Detection

A Real–Complex Hybrid Modulation Approach for Scaling Up Multiuser MIMO Detection

Using Real Constellations in Fully- and Over-Loaded Large MU-MIMO Systems With Simple Detection

Performance Evaluation of Multiuser MIMO E-SDM Systems in Time-Varying Fading Environments

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