Blind widely linear multiuser detection

Gelli, Giacinto; Paura, Luigi; Ragozini, A.R.P.

doi:10.1109/4234.848408

Cited by 76 publications

(29 citation statements)

References 6 publications

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“…It follows that lim σ→0 K G−M (σ) = K G−PD as given in (10) and (11). The limiting form of L G−M (σ) can be similarly computed as the product of limits and yields…”

Section: Appendix D Asymptotic Equivalence Of the Matrices Involved Imentioning

confidence: 95%

“…The so-called widely linear or conjugate linear multiuser detectors in [11][12][13][14] are essentially based on the results in [23] (derived for the MMSE criterion), which proved that the widely linear approach is optimal (in the sense of minimizing the MSE) when dealing with…”

Section: B the "Widely Linear" Approachmentioning

confidence: 99%

“…We extend that idea to the more general case of the group pseudo-decorrelating and group MMSE de-tection for low-rank signaling. Unaware that real-valued modulation was specifically addressed in [6], several authors have recently proposed a less direct method for linear detection that yields the so-called widely linear or linear conjugate detectors in [11][12][13][14]. It is shown, in this paper, that the two approaches are equivalent for linear detection, and, in fact, that the minimal sufficiency approach of [6] is the simpler and the more direct of the two and it easily extends to the general case of group (not just linear) detection.…”

Section: Mai) These Detectors Ifmentioning

confidence: 99%

See 2 more Smart Citations

Multiuser detection for overloaded CDMA systems

Kapur

Varanasi

2003

IEEE Trans. Inform. Theory

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Abstract-Multiuser detection for overloaded CDMA systems, in which the number of users is larger than the dimension of the signal space, is of particular interest when bandwidth is at a premium. In this paper, certain fundamental questions are answered regarding the asymptotic forms and performance of suboptimum multiuser detectors for cases where the desired and/or interfering signal subspaces are of reduced rank and/or have a non-trivial intersection. In the process, two new suboptimum detectors are proposed that are especially well suited to overloaded systems, namely the group pseudo-decorrelator and the group MMSE detector, and the former is seen to be the correct extension of the group decorrelator in the sense that it is the limiting form (in the low-noise regime) of the group MMSE detector. Pseudo-decorrelation is also used as a feedforward filter in a new decision feedback scheme. For the particular case of real-valued modulation, it is shown that the recent proposals of the so-called "improved" linear (aka "linear-conjugate" or "widely linear") detectors were more simply derived earlier using the idea of minimal sufficiency which we also apply to the new detectors of this paper.

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“…It follows that lim σ→0 K G−M (σ) = K G−PD as given in (10) and (11). The limiting form of L G−M (σ) can be similarly computed as the product of limits and yields…”

Section: Appendix D Asymptotic Equivalence Of the Matrices Involved Imentioning

confidence: 95%

Section: B the "Widely Linear" Approachmentioning

confidence: 99%

Section: Mai) These Detectors Ifmentioning

confidence: 99%

See 1 more Smart Citation

Multiuser detection for overloaded CDMA systems

Kapur

Varanasi

2003

IEEE Trans. Inform. Theory

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“…As we demonstrated in [14], the condition of the signal subspace can be improved by exploiting the information contained in the pseudo-autocorrelation matrix. It was also shown in [15] that the performance of the blind multiuser detectors can be improved by utilizingC rr in the presence of noncircular narrow-band interference (NBI).…”

Section: Vblast Scheme Utilizing Complete Second-order Statisticsmentioning

confidence: 99%

VBLAST Detection Algorithms Utilizing Soft Symbol Estimate and Noncircular CAI

Xiao

Yin

Cowan

et al. 2011

IEEE Trans. Signal Process.

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In this correspondence, we address the problem of error propagation inherent in the VBLAST detection process. To this end, two improved VBLAST schemes are proposed. The first one replaces hard decision with soft decision; whereas the other also utilizes soft symbol estimate, but in the meantime exploits the noncircular nature of the residual co-antenna interference (CAI) and noise, it involves refining the error criterion and nulling filter.Simulation results show that both schemes outperform their conventional counterpart, and utilization of noncircular CAI significantly alleviates the error propagation problem and improves the performance of the VBLAST detection.

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“…While this is the optimum strategy when dealing with circular complex random processes (i.e., whenC xx is vanishing), it turns out to be sub-optimum in situations where the transmitted signals and/or interference are noncircular random processes (i.e.,C xx is non-vanishing). It was shown in [7], [8] that the performance of the blind multiuser detectors can be improved by utilizingC xx . In the sequel, we show howC xx can be incorporated into the IC scheme to improve the system performance.…”

Section: The Complex Additive Whitementioning

confidence: 99%

Interference cancellation schemes for MIMO MC-CDM in fading channels

et al. 2009

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A novel interference cancellation (IC) scheme for MIMO Multi-carrier CDM systems is proposed in this correspondence. We show that the existing IC schemes are sub-optimum and their performance can be improved by utilizing some special properties of the residual interference after interference cancellation. Introduction and System Model:In order to exploit additional frequency and/or time diversity, MIMO-

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Blind widely linear multiuser detection

Cited by 76 publications

References 6 publications

Multiuser detection for overloaded CDMA systems

Multiuser detection for overloaded CDMA systems

VBLAST Detection Algorithms Utilizing Soft Symbol Estimate and Noncircular CAI

Interference cancellation schemes for MIMO MC-CDM in fading channels

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