Multiuser generalized detector for uniformly quantized synchronous CDMA signals in wireless sensor networks with additive white Gaussian noise

Tuzlukov, Vyacheslav

doi:10.1109/iccas.2008.4694475

Cited by 11 publications

(7 citation statements)

References 12 publications

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“…When the channel estimation error is neglected, i.e., 0 (181) and (183), the MMSE GR output given by (174) reduces to that of the modified soft-output MMSE GR, in which only decision error propagation is considered, [13,61]. On the other hand, if R N I R r  and no residual interference cancellation error is assumed the MMSE GR output given by (174) reduces to that of [50].…”

Section: Remarksmentioning

confidence: 99%

“…QPSK modulation with Gray mapping is adopted in The performance comparison, in terms of BER, of the proposed soft-output MMSE GR, the modified soft-output MMSE GR [83], the conventional soft-output MMSE GR [84], and the conventional MMSE GR [85] is presented in Fig.10 for spatially independent MIMO channel and GR receiver spatially correlated MIMO channel. Also, a comparison with the softoutput MMSE V-BLAST detector discussed in [73] is made.…”

Section: Channel Estimation and Spatially Correlationmentioning

confidence: 99%

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Signal Processing by Generalized Receiver in DS-CDMA Wireless Communications Systems

Tuzlukov¹

2014

Contemporary Issues in Wireless Communications

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Section: Remarksmentioning

confidence: 99%

Section: Channel Estimation and Spatially Correlationmentioning

confidence: 99%

Signal Processing by Generalized Receiver in DS-CDMA Wireless Communications Systems

Tuzlukov¹

2014

Contemporary Issues in Wireless Communications

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“…By applyingỸ i tos k i , we have the process at the MMSE GR output [51,52,55] Z k i =Ỹ isk i . According to the Gaussian approximation of the MMSE GR back end process, we can writeZ…”

Section: Computation Of Llrmentioning

confidence: 99%

“…When the channel estimation error is neglected, i.e., σ 2 h = 0 in (60), (61) and (63), the MMSE GR output given by (54) reduces to that of the modified soft-output MMSE GR, in which only decision error propagation is considered [51,52]. On the other hand, if R r = I N R and no residual interference cancellation error is assumed, the MMSE GR output given by (54) reduces to that of [55].…”

Section: Remarksmentioning

confidence: 99%

“…The performance comparison, in terms of BER, of the proposed soft-output MMSE GR, the modified soft-output MMSE GR [51], the conventional soft-output MMSE GR [55], and the conventional MMSE GR [24] is presented in Fig. 4 for spatially independent MIMO channel and GR receiver spatially correlated MIMO channel.…”

Section: Channel Estimation and Spatially Correlationmentioning

confidence: 99%

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Signal Processing by Generalized Receiver in DS-CDMA Wireless Communication Systems with Frequency-Selective Channels

Tuzlukov

2011

Circuits Syst Signal Process

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The generalized receiver (GR) based on a generalized approach to signal processing (GASP) in noise is investigated in a direct-sequence code-division multiple access (DS-CDMA) wireless communication system with frequency-selective channels. We consider four avenues: linear equalization with finite impulse response (FIR) beamforming filters; channel estimation and spatially correlation; optimal combining; and partial cancellation. We investigate the GR with simple linear equalization and FIR beamforming filters. Numerical results and simulation show that the GR with FIR beamforming filters surpasses in performance the optimum infinite impulse response beamforming filters with conventional receivers, and can closely approach the performance of GR with infinite impulse response beamforming filters. Channel estimation errors are taken into consideration so that DS-CDMA wireless communication system performance will not be degraded under practical channel estimation. GR takes an estimation error of a maximum likelihood (ML) multipleinput multiple-output (MIMO) channel estimation and GR spatially correlation into account in computation of minimum mean square error (MMSE) and log-likelihood ratio (LLR) of each coded bit. The symbol error rate (SER) performance of DS-CDMA employing GR with a quadrature sub-branch hybrid selection/maximal-ratio combining (HS/MRC) scheme for 1-D modulations in Rayleigh fading is obtained and compared with that of conventional HS/MRC receivers. Procedure of selecting a partial cancelation factor (PCF) for the first stage of a hard-decision partial parallel interference cancellation (PPIC) of the GR employed in DS-CDMA wireless communication system is proposed. A range of optimal PCFs is derived based on the Price's theorem. Computer simulation results show superiority in bit error rate (BER) performance that is very close to that potentially achieved and surpasses the BER performance of the real PCF for DS-CDMA systems discussed in literature.

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Skew control of a container crane

Ngo

Hong

Kim³

et al. 2008

2008 International Conference on Control, Automation and Systems

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This article describes the mathematical model of the 3-dimensional motions of a container crane used in the dockside of a container terminal. The container is suspended by four cables via a spreader. When the container is accelerated or affected by wind, the container will oscillate around horizontal axis (sway) or vertical axis (skew). And an accurate position control of the container is difficult to realize because of uncertain weight, inertial sway, and winds. This paper proposes a simple PID control of the skew motion based on the analysis of 3-dimensional dynamics of the container. This system uses four cylinders to increase and decrease forces in the individual cables so that the container can be affected by yaw torque to reduce the skew error. The simulation results show the effectiveness of the PID controller in controlling the skew motion in the presence of winds.

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Multiuser generalized detector for uniformly quantized synchronous CDMA signals in wireless sensor networks with additive white Gaussian noise

Cited by 11 publications

References 12 publications

Signal Processing by Generalized Receiver in DS-CDMA Wireless Communications Systems

Signal Processing by Generalized Receiver in DS-CDMA Wireless Communications Systems

Signal Processing by Generalized Receiver in DS-CDMA Wireless Communication Systems with Frequency-Selective Channels

Skew control of a container crane

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