Asymptotic analysis of widely linear MMSE multiuser detection-complex vs real modulation

Lampe, A.; Breiling, Marco

doi:10.1109/itw.2001.955134

Cited by 26 publications

(23 citation statements)

References 7 publications

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“…These statistics can be obtained by timeaveraging operations on channel measurement [30]. Our goal is to use the channel model given in (26) and design precoders which are robust to imperfect CSI conditions.…”

Section: Robust Precoding Schemes With Imperfect Csimentioning

confidence: 99%

“…Moreover, they enable MIMO systems to operate with a number of transmit antennas larger (up to a factor of two) than the number of receive antennas. It was reported in [26] that for heavily loaded DS-CDMA systems, widely linear reception of real constellations achieves a higher spectral efficiency than linear reception of complex constellations. It was also shown in [27] that joint transceiver design for real-valued sequences over MIMO channels using WL filters yields significant performance advantages compared to the conventional linear transceiver.…”

mentioning

confidence: 99%

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Improved Linear Transmit Processing for Single-User and Multi-User MIMO Communications Systems

Xiao

Sellathurai

2010

IEEE Trans. Signal Process.

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Abstract-In this paper, we propose a novel linear transmit precoding strategy for multiple-input, multiple-output (MIMO) systems employing improper signal constellations. In particular, improved zero-forcing (ZF) and minimum mean square error (MMSE) precoders are derived based on modified cost functions, and are shown to achieve a superior performance without loss of spectrum efficiency compared to the conventional linear and non-linear precoders. The superiority of the proposed precoders over the conventional solutions are verified by both simulation and analytical results. The novel approach to precoding design is also applied to the case of an imperfect channel estimate with a known error covariance as well as to the multi-user scenario where precoding based on the nullspace of channel transmission matrix is employed to decouple multi-user channels. In both cases, the improved precoding schemes yield significant performance gain compared to the conventional counterparts.

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Section: Robust Precoding Schemes With Imperfect Csimentioning

confidence: 99%

mentioning

confidence: 99%

Improved Linear Transmit Processing for Single-User and Multi-User MIMO Communications Systems

Xiao

Sellathurai

2010

IEEE Trans. Signal Process.

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“…This concept has been applied for numerous wireless applications [34][35][36][37][38][39][40][41][42][43] including equalization, interference suppression, multiuser detection, etc. Implementation WL equalizers is discussed in [39] for conventional time domain single-carrier systems.…”

Section: Introductionmentioning

confidence: 99%

Performance limits of conventional and widely linear DFT-precoded-OFDM receivers in wideband frequency-selective channels

Kuchi

2014

J Wireless Com Network

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This paper describes the limiting behavior of linear and decision feedback equalizers (DFEs) in single/multiple antenna systems employing real/complex-valued modulation alphabets. The wideband frequency-selective channel is modeled using a Rayleigh fading channel model with infinite number of time domain channel taps. Using this model, we show that the considered equalizers offer a fixed post detection signal-to-noise ratio (post-SNR) at the equalizer output that is close to the matched filter bound (MFB). General expressions for the post-SNR are obtained for zero-forcing (ZF)-based conventional receivers as well as for the case of receivers employing widely linear (WL) processing. Simulation is used to study the bit error rate (BER) performance of both minimum-mean-square-error (MMSE) and ZF-based receivers. Results show that the considered receivers advantageously exploit the rich frequency-selective channel to mitigate both fading and inter-symbol interference (ISI) while offering a performance comparable to the MFB.

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“…However, since only one signal dimension is used for data transmission, additional degrees of freedom are available and can be exploited. It was demonstrated in [7] that transmission with real-valued data symbols can lead to a higher spectral efficiency for DS-CDMA systems than using a complex symbol alphabet. In [8], a WL strategy was proposed for a coded downlink OFDM system which combines real-valued ASK modulation and single antenna interference cancellation.…”

Section: Introductionmentioning

confidence: 99%

Codebook Based Single-User MIMO System Design with Widely Linear Processing

Xiao

Tafazolli

Moessner

et al. 2012

IEEE Trans. Commun.

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Abstract-This work addresses joint transceiver optimization for multiple-input, multiple-output (MIMO) systems. In practical systems the complete knowledge of channel state information (CSI) is hardly available at transmitter. To tackle this problem, we resort to the codebook approach to precoding design, where the receiver selects a precoding matrix from a finite set of predefined precoding matrices based on the instantaneous channel condition and delivers the index of the chosen precoding matrix to the transmitter via a bandwidth-constraint feedback channel. We show that, when the symbol constellation is improper, the joint codebook based precoding and equalization can be designed accordingly to achieve improved performance compared to the conventional system.

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Asymptotic analysis of widely linear MMSE multiuser detection-complex vs real modulation

Cited by 26 publications

References 7 publications

Improved Linear Transmit Processing for Single-User and Multi-User MIMO Communications Systems

Improved Linear Transmit Processing for Single-User and Multi-User MIMO Communications Systems

Performance limits of conventional and widely linear DFT-precoded-OFDM receivers in wideband frequency-selective channels

Codebook Based Single-User MIMO System Design with Widely Linear Processing

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