Comparative study of joint-detection techniques for TD-CDMA based mobile radio systems

Vollmer, M.; Haardt, Martin; Götze, J.

doi:10.1109/49.942509

Cited by 138 publications

(127 citation statements)

References 16 publications

Supporting

Mentioning

126

Contrasting

Order By: Relevance

“…The filter calculation (1) requires the inversion of an N ×N matrix. Using the circulant channel matrix H circ instead of H, the computation can be carried out efficiently in the frequency domain [7], since the discrete Fourier transformation (DFT) matrix diagonalizes any circulant matrix. In the frequency domain, the equalization step reduces to a set of element-wise calculationsŝ MMSE,i =Ŵ iri , wherer andŴ are the DFTs of r and W respectively.…”

Section: Low-complexity Sic-mud For Vlsi Implementationmentioning

confidence: 99%

Successive interference cancellation for 3G downlink: Algorithm and VLSI architecture

Belfanti

Benkeser

Badawi

et al. 2012

2012 IEEE/IFIP 20th International Conference on VLSI and System-on-Chip (VLSI-SoC)

View full text Add to dashboard Cite

Abstract-This paper presents a VLSI implementation of an MMSE successive interference cancellation multiuser detector (SIC-MUD) for the downlink of a TD-SCDMA system. Computation in the frequency domain, group-wise interference cancellation, and pre-computation of filter coefficients enable an efficient architecture suitable for mobile handsets. Our implementation in 0.13µm CMOS technology proves that the SIC-MUD is a viable solution for the TD-SCDMA downlink, providing a notable performance gain at a moderate increase in complexity compared to linear equalizers.

show abstract

Section: Low-complexity Sic-mud For Vlsi Implementationmentioning

confidence: 99%

Successive interference cancellation for 3G downlink: Algorithm and VLSI architecture

Belfanti

Benkeser

Badawi

et al. 2012

2012 IEEE/IFIP 20th International Conference on VLSI and System-on-Chip (VLSI-SoC)

View full text Add to dashboard Cite

show abstract

“…Against this backdrop [7]- [14], the novelty of this paper is that it jointly investigates the performance benefits of adaptive antennas [3], adaptive modulation [15], and multiuser detection [15]- [17] while jointly optimizing the physical and network layers in both FDD and TDD contexts. Our approach is based on extensive network simulations, since the joint analytical treatment of such a complex system is unrealistic.…”

Section: A State-of-the-art Studiesmentioning

confidence: 99%

Adaptive Beamforming and Adaptive Modulation-Assisted Network Performance of Multiuser Detection-Aided FDD and TDD CDMA Systems

Blogh

Hanzo

2007

IEEE Trans. Veh. Technol.

View full text Add to dashboard Cite

Abstract-The network performance of a frequency division duplex and time division duplex (TDD) code division multiple access (CDMA)-based system is investigated using system parameters similar to those of the Universal Mobile Telecommunication System. The new call blocking and call dropping probabilities, the probability of low-quality access, and the required average transmit power are quantified both with and without adaptive antenna arrays (AAAs), as well as when subjected to shadow fading. In some of the scenarios investigated, the system's user capacity is doubled with the advent of adaptive antennas. The employment of adaptive modulation techniques in conjunction with AAAs resulted in further significant network capacity gains. This is particularly so in the context of TDD CDMA, where the system's capacity becomes poor without adaptive antennas and adaptive modulation owing to the high base station (BS) to BS interference inflicted as a consequence of potentially using all time slots in both the uplink and downlink of the emerging wireless Internet.Index Terms-Adaptive beamforming, adaptive modulation, code division multiple access (CDMA) systems, Universal Mobile Telecommunication System Terrestrial Radio Access (UTRA), wireless network performance.

show abstract

“…However, the system suffers from inter-symbol interference (ISI) and multi-user interference (MUI) caused by multipath propagation, leading to a significant capacity loss in typical outdoor environments. In order to enable the design of low complexity transceivers that can cope with multipath channels, next generation cellular systems could rather rely on cyclic prefix code-division multiple access (CP-CDMA) that combines DS-CDMA and frequency domain equalization (FDE) [2], [3], [4]. The CP-CDMA transmitter suffers from a low peak-to-average power ratio (PAPR) that makes it particularly interesting in the uplink to reduce the constraints on the mobile terminal analog front-end.…”

Section: Introductionmentioning

confidence: 99%

Single-Carrier FDMA or Cyclic-Prefix CDMA With Optimized Spreading Sequences?

Horlin

Bourdoux

Lopez-Estraviz

et al. 2008

IEEE Trans. Veh. Technol.

View full text Add to dashboard Cite

Abstract-In order to meet the data rate and quality-ofservice (QoS) requirements of the future cellular systems, new air interfaces are currently under development. In this paper, we compare two air interfaces of particular interest for the uplink: cyclic-prefix code-division multiple access (CP-CDMA) proposed in the literature as an evolution of direct-sequence code-division multiple access (DS-CDMA) because it enables the low complexity equalization of the multipath channel in the frequency domain, and single-carrier frequency-division multiple access (SC-FDMA), recently proposed in the long term evolution of the 3GPP standard because it enables the easy separation of the users in the frequency domain. We demonstrate analytically that SC-FDMA is a special case of CP-CDMA, in which the CDMA codes have been optimized to minimize the symbol estimation mean square error (MSE) under a constraint of received power. Numerical results confirm that SC-FDMA outperforms significantly CP-CDMA at high user loads.

show abstract

Comparative study of joint-detection techniques for TD-CDMA based mobile radio systems

Cited by 138 publications

References 16 publications

Successive interference cancellation for 3G downlink: Algorithm and VLSI architecture

Successive interference cancellation for 3G downlink: Algorithm and VLSI architecture

Adaptive Beamforming and Adaptive Modulation-Assisted Network Performance of Multiuser Detection-Aided FDD and TDD CDMA Systems

Single-Carrier FDMA or Cyclic-Prefix CDMA With Optimized Spreading Sequences?

Contact Info

Product

Resources

About