MATCHED MEDIAN DETECTORS FOR MULTIPLE-ACCESS CHANNELS

被引：3
作者：
WICHMAN, R
LILLEBERG, J
NEUVO, Y
机构：
[1] Tampere University of Technology, Signal Processing Laboratory, FIN-33101 Tampere
[2] Nokia Mobile Phones, FIN-90571 Oulu
[3] Nokia Mobile Phone, FIN-02601 Espoo
来源：
SIGNAL PROCESSING | 1994年 / 38卷 / 03期
关键词：
MEDIAN FILTER; SPREAD SPECTRUM; CODE-DIVISION MULTIPLE-ACCESS;
D O I：
10.1016/0165-1684(94)90154-6
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
The performance of matched median detectors is studied in a coherent code-division multiple-access environment addressing asynchronous and synchronous communication. Two types of noise sources interfering with the data transmission are assumed: multiple-access interference and additive impulsive channel noise. A detector structure based on a multistage multiple-access rejection scheme and matched median filters is studied. Probability of error analysis is presented for a two-stage detector, and performance is characterized in terms of average bit-error probability. Calculations and simulations show that the multistage matched median structure performs well in situations where the energies of the code signals are different, therefore being able to combat the near-far problem characteristic of direct-sequence spread spectrum multiple-access systems.
引用
收藏
页码：345 / 357
页数：13
相关论文
共 19 条
  • [1] Aazhang, Paris, Orsak, Neural networks for multiuser detection in code-division multiple-access communications, IEEE Trans. Commun., 40, 7, pp. 1212-1222, (1992)
  • [2] Aazhang, Poor, Performance of DS/SSMA communications in impulsive channels — Part I: Linear correlation receivers, IEEE Trans. Commun., 35 COM, 11, pp. 1179-1188, (1987)
  • [3] Aazhang, Poor, Performance of DS/SSMA communications in impulsive channels — Part II: Hard-limiting correlation receivers, IEEE Trans. Commun., 36, 1, pp. 88-97, (1988)
  • [4] Aazhang, Poor, An analysis of nonlinear direct-sequence correlators, IEEE Trans. Commun., 37, 7, pp. 723-731, (1989)
  • [5] Astola, Neuvo, Matched median filtering, IEEE Trans. Commun., 40, 4, pp. 722-729, (1992)
  • [6] Justusson, Median filtering: Statistical properties, Topics in Applied Physics, Two Dimensional Digital Signal Processing II, (1981)
  • [7] Kassam, Signal Detection in Non-Gaussian Noise, (1988)
  • [8] Kohno, Imai, Hatori, Pasupathy, An adaptive canceller of cochannel interference for spread-spectrum multiple-access networks in a power line, IEEE J. Selected Commun., 8, 4, pp. 691-699, (1990)
  • [9] Lupas, Verdu, Near-far resistance of multiuser detectors in asynchronous channels, IEEE Trans. Commun., 38, 4, pp. 496-507, (1990)
  • [10] Mowbray, Pringle, Grant, Increased CDMA system capacity through adaptive cochannel interference regeneration and cancellation, IEE Proc.—I, 139, 5, pp. 515-524, (1992)
12