Data detection algorithms specially designed for the downlink of CDMA mobile radio systems

Klein, Axel

doi:10.1109/vetec.1997.596348

Cited by 181 publications

(79 citation statements)

References 6 publications

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“…This idea can also be applied in the multipath channel case but since users within a cell are no longer orthogonal there will be some loss of optimality. Note that even if the orthogonality between the users within a particular cell is restored using the equalization techniques described in [3], [4], [5], [6], [7], [8], [9], [10], [11], the resulting matched filter bank outputs will contain noise terms that are correlated across the users.…”

Section: Reduced Complexity Optimum Detectionmentioning

confidence: 99%

“…Toward that goal, several authors have studied the problem of improving the performance of IS-95 and third generation Wideband-CDMA downlink reception in a single-cell environment. In [3]- [12] the authors observe that the orthogonality of the user transmissions within a particular cell is destroyed by multiple paths in the propagation channel between the base station and the IS-95 downlink receiver. The authors propose receivers that all share the common feature of a linear equalizer front-end that cancels the effects of the multipath propagation channel and restores the orthogonality of the users.…”

Section: Introductionmentioning

confidence: 99%

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Multiuser Detection for Out-of-Cell Cochannel Interference Mitigation in the IS-95 Downlink

Brown¹,

Poor²,

Verdú³

et al. 2002

Information Technology: Transmission, Processing and Storage

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This paper considers the application of multiuser detection techniques to improve the quality of downlink reception in a multi-cell IS-95 digital cellular communication system. In order to understand the relative performance of suboptimum multiuser detectors including the matched filter detector, optimum multiuser detection in the context of the IS-95 downlink is first considered. A reduced complexity optimum detector that takes advantage of the structural properties of the IS-95 downlink and exhibits exponentially lower complexity than the brute-force optimum detector is developed. The Group Parallel Interference Cancellation (GPIC) detector, a suboptimum, low-complexity multiuser detector that also exploits the structure of the IS-95 downlink is then developed. Simulation evidence is presented that suggests that the performance of the GPIC detector may be near-optimum in several cases. The GPIC detector is also tested on a snapshot of on-air data measured with an omnidirectional antenna in an active IS-95 system and is shown to be effective for extracting weak downlink transmissions from strong out-of-cell cochannel interference. The results of this paper suggest that the GPIC detector offers the most performance gain in scenarios where weak downlink signals are corrupted by strong out-of-cell cochannel interference.

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Section: Reduced Complexity Optimum Detectionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Multiuser Detection for Out-of-Cell Cochannel Interference Mitigation in the IS-95 Downlink

Brown¹,

Poor²,

Verdú³

et al. 2002

Information Technology: Transmission, Processing and Storage

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“…By taking advantage of these features, the chip-level equalization was proposed to mitigate the MAI together with a despreader [4], [10]. A despreader can mitigate the MAI after chip-level equalization to restore the orthogonality.…”

mentioning

confidence: 99%

Receivers with chip-level decision feedback equalizer for CDMA downlink channels

Choi

Kim

Lim

2004

IEEE Trans. Wireless Commun.

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“…In [1], we presented another receiver approach which is based on channel equalization. This approach was introduced independently in [2] and [3]. Whereas the RAKE approach focuses on the noise (and intercell interference), the equalizer approach focuses on the intracell interference.…”

Section: Introductionmentioning

confidence: 99%

A RAKE receiver with intracell interference cancellation for a DS-CDMA synchronous downlink with orthogonal codes

Lenardi

Slock²

VTC2000-Spring. 2000 IEEE 51st Vehicular Technology Conference Proceedings (Cat. No.00CH37026)

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-The conventional receiver for DS-CDMA communications is the RAKE receiver. The RAKE receiver is a matched filter, matched to the operations of spreading, pulse shape filtering and channel filtering. Such a matched filter maximizes the Signal-to-Interference-plus-Noise Ratio (SINR) at its output if the interference plus noise is white. This may be approximately the case if user-dependent scrambling (aperiodic spreading) is used. This is one option for the uplink in 3rd generation systems. However, this is not the case in the synchronous downlink with cell-dependent scrambling, orthogonal codes and a common channel. In this paper we propose a restricted class of linear receivers for the downlink, exhibiting a limited or no complexity increase with respect to the RAKE receiver. The linear receivers in this class have the same structure as a RAKE receiver, but the channel matched filter gets replaced by an equalizer filter that is designed to maximize the SINR at the output of the receiver. The complexity of the equalizer filter is variable and can possibly be taken to be as low as in the RAKE receiver (same structure as the channel matched filter), while its adaptation guarantees improved performance with respect to (w.r.t.) the RAKE receiver. Various adaptation strategies are considered and compared in simulations.

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Data detection algorithms specially designed for the downlink of CDMA mobile radio systems

Cited by 181 publications

References 6 publications

Multiuser Detection for Out-of-Cell Cochannel Interference Mitigation in the IS-95 Downlink

Multiuser Detection for Out-of-Cell Cochannel Interference Mitigation in the IS-95 Downlink

Receivers with chip-level decision feedback equalizer for CDMA downlink channels

A RAKE receiver with intracell interference cancellation for a DS-CDMA synchronous downlink with orthogonal codes

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