Linear multiuser transmission for CDMA with reduced computational complexity

Irmer, Ralf; Gaur, Jatin; Fettweis, Gerhard

doi:10.1109/vetecs.2004.1390503

Cited by 3 publications

(1 citation statement)

References 15 publications

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“…The MUT is thought to be an effective way to eliminate ISI and MAI and it also has the advantage of cutting the complexity of the receiver dramatically, because the receiver is not necessary to adapt the multiuser detection (MUD) to eliminate the ISI and MAI. As the increase of the system capacity by using antennas arrays in CDMA comes from the MAI reduction, the MUT combined with adaptive antenna arrays, named the space-time MUT, is studied by more and more people [3] [4] .…”

Section: Introductionmentioning

confidence: 99%

Performance Analysis of Multiuser Transmission with Adaptive Antenna Arrays Using Spatial Classes

Zheng

Liao

Zhou

et al. 2007

2007 IEEE 66th Vehicular Technology Conference

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CDMA system capacity is interference limited. The multiuser transmission (MUT) with adaptive antenna arrays for the downlink direction is considered to increase system capacity and to eliminate the multiple-access interference (MAI) and the inter-symbol interference (ISI) of the CDMA system. In this paper, the angular gain of the spatial filter is modeled by a piece-line function to analysis the interference difference between the in-beam users and the out-beam users. Based on this analysis, a lower complexity MUT scheme using spatial classes is proposed for avoiding MUT computation complexity, which can achieve the nearly same performance with the conventional MUT scheme. The bit-error probability approximation of this MUT scheme is also analyzed as well. The simulation result is used to confirm the availability of this lower complexity MUT scheme.

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Section: Introductionmentioning

confidence: 99%

Performance Analysis of Multiuser Transmission with Adaptive Antenna Arrays Using Spatial Classes

Zheng

Liao

Zhou

et al. 2007

2007 IEEE 66th Vehicular Technology Conference

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Advanced CDMA transmission concepts for 3G and 4G mobile radio communications

Baier

Meurer

Eighth IEEE International Symposium on Spread Spectrum Techniques and Applications - Programme and Book of Abstracts (IEEE Cat.

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Overloaded TDD-CDMA cells with multiuser transmission

Irmer¹,

Habendorf²,

Rave³

et al.

ITG Workshop on Smart Antennas (IEEE Cat. No.04EX802)

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The number of supportable users in the TDD- [I]. All MUT methods have the constraint that the transmit CDMA downlink is usually limited by multipleaccess interference and by lbe limited number of available orthogonal spreading codes. By using Multiuser Transmission (MUT) methods in the base station in conjunction with smart antennas, the interference can be mitigated and the downlink cell capacity can be substantiallv increased. The number of snonorted users signal power is limited. Linear Zero-Forcing MUT (TxzF) concepts are known as Transmitter Precoding [Z], Joint Transmission [3], Joint PreDistortion [4l, [519 [61 O r Joint Signal Preceding [7l. The linear MMSE Transmitter or Transmit Wiener filter (TxWE) and the necessary iransmit power in the CDMA iiwnlink with linear MUT methods, like Joint Transmission, and nonlinear methods like Minimum Bit Error Rate Multiuser Transmission is investigated. By eo-locating dinerent scrambling code groups in one base station, lhe number of supported nsem is roughly proportional to the number of applied antennas, but the spatio-temporal dimension can also be exceeded in certain circumstances. Furthermore, a simplified phase-only Minimum Bit Error Rate Multiuser Transmission is proposed, including the first and second order analytic BER derivatives. The simulation environment is similar to 3GPP TDD CDMA or the Chinese TD-SCDMA

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Linear multiuser transmission for CDMA with reduced computational complexity

Cited by 3 publications

References 15 publications

Performance Analysis of Multiuser Transmission with Adaptive Antenna Arrays Using Spatial Classes

Performance Analysis of Multiuser Transmission with Adaptive Antenna Arrays Using Spatial Classes

Advanced CDMA transmission concepts for 3G and 4G mobile radio communications

Overloaded TDD-CDMA cells with multiuser transmission

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