Optimal multistage interference cancellation for CDMA systems using the nonlinear MMSE criterion

Gollamudi, S.; Nagaraj, S.; Huang, Yih-Fang; Buehrer, R. Michael

doi:10.1109/acssc.1998.750946

Cited by 15 publications

(13 citation statements)

References 6 publications

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“…Multistage interference cancellation schemes are known to be simple and effective multiuser detectors for long-code DS-CDMA systems. Iterative schemes using parallel interference cancellation (PIC) and nonlinear MMSE interference cancellation (NMIC) for demodulating M -ary orthogonal signaling formats in DS-CDMA systems were proposed in [4,5]. For the purpose of this study, we mainly consider the PIC scheme used in [4] and extend this scheme to soft decision based interference cancellation in Section 4.…”

Section: Cellationmentioning

confidence: 99%

“…The rationale is that hard IC and CE tends to increase the interference and propagate errors with incorrect decision feedback; however, with soft cancellation and CE, the soft estimate of an erroneously estimated symbol usually has a small value and does not make much contribution to the feedback and error propagation is therefore hopefully reduced. Soft IC in uncoded M -ary CDMA system was treated in [5], in which a multistage MMSE linear interference canceler that minimizes the power of residual cancellation error for each user was proposed. In this paper, we propose a MAP-based soft IC scheme and describe how the soft information used for cancellation can be derived.…”

Section: Soft Interference Cancellation (Ic) and Channel Estimation (Ce)mentioning

confidence: 99%

“…The estimation of channel parameters in a DS-CDMA system with M -ary orthogonal modulation, which is the main concern of this paper, has been the subject of study in several papers (see, for instance, [4,5,6,7]). A maximum likelihood (ML) channel estimator was employed in [4] for estimating time-varying multipath channels.…”

Section: Introductionmentioning

confidence: 99%

“…A maximum likelihood (ML) channel estimator was employed in [4] for estimating time-varying multipath channels. In [5], a blind channel estimation strategy based on an adaptive Wiener filtering approach that yields unbiased channel estimates and low estimation variance was proposed. Joint channel estimation and data detection has been treated in , e.g., [6,8,9,7,10,11,12].…”

Section: Introductionmentioning

confidence: 99%

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Joint data detection and estimation of time‐varying multipath rayleigh fading channels in asynchronous DS‐CDMA systems with long spreading sequences

Xiao

Ström

2006

Trans Emerging Tel Tech

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Abstract. In this paper, we present a joint approach to data detection and channel estimation for the asynchronous direct-sequence code-division multiple access (DS-CDMA) systems employing orthogonal signaling formats and long scrambling codes. Our emphasis is placed on different channel estimation algorithms since the performance of a communication system depends largely on its ability to retrieve an accurate measurement of the underlying channel. We investigate channel estimation algorithms under different conditions. The estimated channel information is used to enable coherent data detection to combat the detrimental effect of the multiuser interference and the multipath propagation of the transmitted signal. In the considered multiuser detector, we mainly use interference cancellation techniques, which are suitable for long-code CDMA systems. Interference cancellation and channel estimation using soft estimates of the transmitted signal is also proposed in this paper. Different channel estimation schemes are evaluated and compared in terms of mean square error (MSE) of channel estimation and bit error rate (BER) performance. Based on our analysis and numerical results, some recommendations are made on how to choose appropriate channel estimators in practical systems.

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Section: Cellationmentioning

confidence: 99%

Section: Soft Interference Cancellation (Ic) and Channel Estimation (Ce)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Joint data detection and estimation of time‐varying multipath rayleigh fading channels in asynchronous DS‐CDMA systems with long spreading sequences

Xiao

Ström

2006

Trans Emerging Tel Tech

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“…The estimation of channel parameters in a DS-CDMA system with orthogonal signalling formats has been the subject of study in several papers (see, for instance, [1], [2], [3], [4]). The maximum likelihood (ML) channel estimator for long code CDMA systems over time-varying multipath channels was employed in [1].…”

Section: Introductionmentioning

confidence: 99%

Estimation of time-varying multipath Rayleigh fading channels in asynchronous DS-CDMA systems

Xiao

Ström

Carrasco

2004 IEEE 15th International Symposium on Personal, Indoor and Mobile Radio Communications (IEEE Cat. No.04TH8754)

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Abstract-In this paper, we present channel estimation algorithms for the asynchronous directsequence code-division multiple access (DS-CDMA) systems employing orthogonal signalling formats and long scrambling codes. The performance of a communication system depends largely on its ability to retrieve an accurate measurement of the underlying channel. We investigated channel estimation algorithms under different conditions. The estimated channel information is used to enable coherent data detection to combat the detrimental effect of multipath propagation of the transmitted signal as well as multiple access interference (MAI). Different channel estimation schemes are evaluated and compared in terms of mean square error (MSE) of the channel estimate and the bit error rate (BER) performance. Based on our analysis and numerical results, some recommendations are made on how to choose appropriate channel estimators in practical systems.

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Greedy Detection

AlRustamani¹,

Vojcic²,

Stefanov³

Information Technology: Transmission, Processing and Storage

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Optimal multistage interference cancellation for CDMA systems using the nonlinear MMSE criterion

Cited by 15 publications

References 6 publications

Joint data detection and estimation of time‐varying multipath rayleigh fading channels in asynchronous DS‐CDMA systems with long spreading sequences

Joint data detection and estimation of time‐varying multipath rayleigh fading channels in asynchronous DS‐CDMA systems with long spreading sequences

Estimation of time-varying multipath Rayleigh fading channels in asynchronous DS-CDMA systems

Greedy Detection

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