A comparative analysis of linear multiuser detectors for fading multipath channels

Huang, Hu; Schwartz, S.C.

doi:10.1109/glocom.1994.513299

Cited by 33 publications

(16 citation statements)

References 8 publications

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“…The received signals from different paths and antennas are combined to decode the desired user's bits. However, the inherent structure of the multiple interferers is not exploited, i.e., a matched filter to the spreading waveform of the desireduserisemployed,e.g., [18]- [20].Suboptimummultiuserdetectors for multipath fading channels are studied in [21] and [22]. Arecentpaper [23]addressesthederivationofthesufficientstatistics and the optimum and some suboptimum multiuser detectors when a receiver antenna array is present and the users' transmissions pass through a multipath channel.…”

Section: Introductionmentioning

confidence: 99%

Interference management for CDMA systems through power control, multiuser detection, and beamforming

Yener

Yates

Ulukuş

2001

IEEE Trans. Commun.

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Abstract-Among the ambitious challenges to be met by the third-generation systems is to provide high-capacity flexible services. Code-division multiple access (CDMA) emerges as a promising candidate to meet these challenges. It is well known that CDMA systems are interference-limited, and interference management is needed to maximally utilize the potential gains of this access scheme. Several methods of controlling and/or suppressing the interference through power control, multiuser detection (temporal filtering), and receiver beamforming (spatial filtering) have been proposed to increase the capacity of CDMA systems up to date. We investigate the capacity increase that is possible by combining power control with intelligent temporal and spatial receiver filter design. The signal-to-interference ratio maximizing joint temporal-spatial receiver filters in unconstrained and constrained filter spaces are derived. Two-step iterative power control algorithms that converge to the optimum powers and the joint temporal and spatial receiver filters in the corresponding filter domains are given. A power control algorithm with a less complex filter update procedure is also given. We observe that significant savings in total transmit power are possible if filtering in both domains is utilized compared with conventional power control and joint optimal power control and filtering in only one domain.Index Terms-Code-division multiple access (CDMA), interference suppression, MMSE receivers, multiuser detection, power control, receiver beamforming.

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Section: Introductionmentioning

confidence: 99%

Interference management for CDMA systems through power control, multiuser detection, and beamforming

Yener

Yates

Ulukuş

2001

IEEE Trans. Commun.

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“…5, the BERs of the adaptive and non-adaptive systems with the LDD are compared. For the non-adaptive system, this MUD is derived from the RAKE LDD designed for multipath fading channel in [21]. Even with poorly predicted CSI (η=0.925), the AFH system outperforms the nonadaptive system.…”

Section: Numerical Resultsmentioning

confidence: 99%

Performance of Improved Channel Allocation for Multicarrier CDMA with Adaptive Frequency Hopping and Multiuser Detection

Jia¹,

Duel-Hallen²

2008

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The public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Subchannel allocation for the reverse link of multicarrier code-division multiplex-access (MC-CDMA) system with adaptive frequency hopping (AFH) is investigated. An efficient allocation method that can be employed with the matched filter (MF) receiver as well as with multiuser detectors (MUDs) by exploiting the appropriate signal to interference and noise ratio (SINR) analysis is described. It is demonstrated that combined improved subcarrier allocation and the linear decorrelating detector (LDD) are very efficient in mitigating multiple-access interference (MAI), resulting in much larger system capacity than for a non-adaptive MC direct-sequence (DS)-CDMA system. This conclusion is confirmed for realistic fading channels with U REPORT DATE (DD-MM-YYYY) TITLE AND SUBTITLE 29-08-200813. SUPPLEMENTARY NOTES The views, opinions and/or findings contained in this report are those of the author(s) and should not contrued as an official Department of the Army position, policy or decision, unless so designated by other documentation. DISTRIBUTION AVAILIBILITY STATEMENT ABSTRACTSubchannel allocation for the reverse link of multicarrier code-division multiplex-access (MC-CDMA) system with adaptive frequency hopping (AFH) is investigated. An efficient allocation method that can be employed with the matched filter (MF) receiver as well as with multiuser detectors (MUDs) by exploiting the appropriate signal to interference and noise ratio (SINR) analysis is described. It is demonstrated that combined improved subcarrier allocation and the linear decorrelating detector (LDD) are very efficient in mitigating multiple-access interference (MAI), resulting in much larger system capacity than for a non-adaptive MC direct-sequence (DS)-CDMA system. This conclusion is confirmed for realistic fading channels with correlated subcarriers and imperfect channel state information (CSI) at the transmitter. Abstract-Subchannel allocation for the reverse link of multicarrier code-division multiplex-access (MC-CDMA) system with adaptive frequency hopping (AFH) is investigated. An efficient allocation method that can be employed with the matched filter (MF) receiver as well as with multiuser detectors (MUDs) by exploiting the appropriate signal to interference and noise ratio (SINR) analysis is described. It is demonstrated that combined improved subcarrier allocation and the linear decorrelating detector (LDD) are very efficient in mitigating multiple-access interference (MAI), resulting in much larger system capacity than for a non-adaptive MC direct-sequence (DS)-CDMA system. This conclusion is confirmed for realistic fading channels with correlated subcarriers and imperfect channel state information (CSI) at the transmitter.

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“…Linear multiuser detectors for multipath fading channels include the Multipath Decorrelating Detector (MDD) [15] and the RAKE Decorrelating Detector (RDD) [23]. RDD achieves the optimum performance over all linear multiuser detectors for multipath signals of unknown energy [23].…”

Section: System Model and Linea Mai Cancellation Methods For Mulmentioning

confidence: 99%

Performance Analysis of a Wireless CDMA Transmission System with Receiver Diversity Schemes

Islam¹

2018

IJRASET

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, where they can be afforded. However, these methods are complex since MAI cancellation filters need to be updated continuously as fading coefficients vary [18]. CDMA technology greatly benefits from exploiting the multipath diversity of the channel [16]. Pre-RAKE diversity combining are proposed for the downlink channel to achieve multipath diversity without the burden of the RAKE receiver at the mobile. In [19], space-time pre-RAKE (STPR) technique was investigated for transmitter antenna diversity systems. The ideal performance of this method approaches that of the maximal ratio receiver combining (MRRC) of all space and frequency diversity branches. Although the performance of an wireless CDMA system with transmit diversity is reported with Pre-RAKE space time coding, it is important to evaluate overall channel bit error rate performance results considering the effect of multi-path fading for different receiver diversity and combining techniques.II. PRE-RAKE FILTERING First, consider the downlink of the synchronous DS/CDMA system with K active users and a single transmitter antenna. The transmitted equivalent low pass signal x(t) at the BS station is

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A comparative analysis of linear multiuser detectors for fading multipath channels

Cited by 33 publications

References 8 publications

Interference management for CDMA systems through power control, multiuser detection, and beamforming

Interference management for CDMA systems through power control, multiuser detection, and beamforming

Performance of Improved Channel Allocation for Multicarrier CDMA with Adaptive Frequency Hopping and Multiuser Detection

Performance Analysis of a Wireless CDMA Transmission System with Receiver Diversity Schemes

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