## Parallel Interference Cancellation for CDMA Systems (1995)

Venue: | In 33rd Annual Allterton Conference on Communications, Control and Computing |

Citations: | 12 - 0 self |

### BibTeX

@INPROCEEDINGS{Ghazi-moghadam95parallelinterference,

author = {Vafa Ghazi-moghadam and Laurie B. Nelson and Mostafa Kaveh},

title = {Parallel Interference Cancellation for CDMA Systems},

booktitle = {In 33rd Annual Allterton Conference on Communications, Control and Computing},

year = {1995},

pages = {216--224}

}

### Years of Citing Articles

### OpenURL

### Abstract

This paper presents analysis of a multistage parallel interference canceller receiver for a synchronous multiuser CDMA system. At every stage, new estimates of the multiple access interference are formed from infinitely soft decisions for the users' data. These new estimates are then used to cancel multiple access interference and form new decision statistics for the users' data. We show that in limit, when the number of stages increases infinitely, this receiver has the performance of a decorrelating detector. For an arbitrary finite number of stages, closed form expressions for the probability of error and the asymptotic multiuser efficiency of this receiver are presented and evaluated for performance comparisons with the conventional and decorrelating detectors. 1 Introduction The design of CDMA receivers has received increasing attention in the recent years. A major limiting factor for the performance of the conventional CDMA receiver is the near-far effect. Formally proposed CDM...

### Citations

5025 |
Matrix analysis
- Horn, Johnson
- 1985
(Show Context)
Citation Context ...., lim n!1 (I \Gamma R) n+1 = 0 (9) This means that the multistage parallel canceller will perform (in the limit) like the decorrelator proposed in [3]. In general, for a matrix C, the following holds=-=[9]-=-: lim n!1 C n = 0 () r(C) ! 1; (10) where r(C) is the spectral radius of C; r(C) = maxfjj :sis an eigenvalue of Cg, (Thus, r(I \Gamma R) ! 1 is the necessary and sufficient condition for the Eq. 9). I... |

664 | Matrix Perturbation Theory
- Stewart, Sun
- 1990
(Show Context)
Citation Context ...owever, for any matrix norm k \Delta k, r(C)skCk; in addition, for a symmetric matrix, r(C) = kCk 2 where kCk 2 is the 2-norm of matrix C [9]. For a K \Theta K matrix, the following relationship holds=-=[10]-=-: kCk 2skCk1 = max 1iK K X j=1 jc ij j (11) Thus, we can use the infinite-norm, which can be calculated in closed form, as an upper bound for the spectral radius. For our example, C = I \Gamma R is a ... |

321 | Linear multiuser detectors for synchronous code-division multiple-access channels
- Lupas, VerdĂș
- 1989
(Show Context)
Citation Context ...ets diminishes as the number of stages increase; i.e., lim n!1 (I \Gamma R) n+1 = 0 (9) This means that the multistage parallel canceller will perform (in the limit) like the decorrelator proposed in =-=[3]-=-. In general, for a matrix C, the following holds[9]: lim n!1 C n = 0 () r(C) ! 1; (10) where r(C) is the spectral radius of C; r(C) = maxfjj :sis an eigenvalue of Cg, (Thus, r(I \Gamma R) ! 1 is the ... |

209 |
On the capacity of a cellular CDMA system
- GILHOUSEN
- 1991
(Show Context)
Citation Context ...ion in the recent years. A major limiting factor for the performance of the conventional CDMA receiver is the near-far effect. Formally proposed CDMA systems use power control to overcome this problem=-=[1]-=-. Although approximate power control has important advantages, the fine control necessary to combat the near-far effect degrades the performance of stronger users, thereby limiting the overall system ... |

117 |
Decorrelating decision-feedback multiuser detector for synchronous code-division multiple access channels
- Duel-Hallen
- 1993
(Show Context)
Citation Context ...ance of stronger users, thereby limiting the overall system performance. Optimal and suboptimal multiuser detectors for CDMA systems that are robust to the near-far effect have been considered in [2]-=-=[5]-=-. These detectors take advantage of the known structure of multiuser interference, and thus improve the receiver performance significantly. The major drawback of many of these detectors is their compu... |

81 |
Near-optimum detection in synchronous code-division multiple access systems
- Varanasi, Aazhang
- 1991
(Show Context)
Citation Context ...ance analysis does not become unwieldy as more stages are added. The focus in [8] is on analysis for parallel interference cancellation using hard decision feedback (similar to multistage detector in =-=[4]-=-); some limited results for one stage parallel interference cancellation with infinitely soft decisions are also included. The results in [6]-[8] are consistent with the more general (and arguably sim... |

61 |
Optimum, multiuser asymptotic efficiency
- VerdĂș
- 1986
(Show Context)
Citation Context ...formance of stronger users, thereby limiting the overall system performance. Optimal and suboptimal multiuser detectors for CDMA systems that are robust to the near-far effect have been considered in =-=[2]-=--[5]. These detectors take advantage of the known structure of multiuser interference, and thus improve the receiver performance significantly. The major drawback of many of these detectors is their c... |

25 |
Combination of an adaptive array antenna and a canceller of interference for direct-sequence spread-spectrum multiple -access system
- Kohno, Imai, et al.
- 1990
(Show Context)
Citation Context ...al correlations and not the received signal amplitudes. The parallel cancellation can be repeated for an arbitrary number of stages. Parallel interference cancellers were discussed in [6]-[8]. In [6]-=-=[7]-=-, the interference estimates are re-spread and then subtracted from the received signal in the continuous-time domain; performance analyses are carried out for one stage of cancellation. Since the spr... |

23 |
Improved CDMA performance using parallel interference cancellation
- Divsalar, Simon
(Show Context)
Citation Context ...nly the signal correlations and not the received signal amplitudes. The parallel cancellation can be repeated for an arbitrary number of stages. Parallel interference cancellers were discussed in [6]-=-=[8]-=-. In [6]-[7], the interference estimates are re-spread and then subtracted from the received signal in the continuous-time domain; performance analyses are carried out for one stage of cancellation. S... |

18 |
Performance Comparison of a DS/CDMA System using a Successive Interference Cancellation (IC) Scheme and a Parallel IC Scheme under Fading
- Patel, Holtzman
- 1995
(Show Context)
Citation Context ...es only the signal correlations and not the received signal amplitudes. The parallel cancellation can be repeated for an arbitrary number of stages. Parallel interference cancellers were discussed in =-=[6]-=--[8]. In [6]-[7], the interference estimates are re-spread and then subtracted from the received signal in the continuous-time domain; performance analyses are carried out for one stage of cancellatio... |