一种适用于异步DS-CDMA系统的低复杂度DOA估计算法
A Low-Complexity DOA Estimation Algorithm for Asynchronous DS-CDMA Systems
-
摘要: 针对异步DSCDMA系统的多用户环境，该文提出了一种低复杂度的DOA估计算法。该算法首先去除多址干扰及噪声项的影响，并构造出一组包含有感兴趣信息的相关阵；然后采用传统的MUSIC算法即可从这些矩阵中准确地估计出各DOA信息。算法具有计算量小，估计精度高等优点。仿真实验验证了算法的有效性。
-
关键词:
- 波达方向估计; 智能天线; 空时信号处理
Abstract: In this paper, a low-complexity DOA estimation algorithm is presented for asynchronous DS-CDMA systems with multipath propagation. First, the influence of multiacess interferences and noise is eliminated. Then, a group of correlation matrices constituted by the interested DOAs is derived. Finally, according to the conventional MUSIC algorithm, DOAs are resolved preciously from the above matrices. The algorithm has the advantages of low computation burden and high resolution. Simulation results confirm the effectiveness of the algorithm. -
Godara L C. Application of antenna arrays to mobile communications, part Ⅱ: beam-forming and direction-of-arrival considerations[J].Proc. IEEE.1997, 85(8):1195-1245[2]Blanz J J, et al.. Smart antennas for combined DOA and joint channel estimation in time-slotted CDMA mobile radio systems with joint detection[J].IEEE Trans. on Veh. Tech.2000, 49(3):293-306[3]Lei Zhongding, Lim T J. Estimation of directions of arrival of multipath signal in CDMA systems[J].IEEE Trans. on Comm.2000, 48(6):1022-1028[4]Liu J, Wan C. Signal sub-space DOA estimation in CDMA communications with multipath propagation. IEEE Wireless Comm. and Networking Conf., 1999, 2: 640-643.[5]Naguib A F, Paulraj A. Recursive adaptive beamforming for wireless CDMA[J].IEEE International Conf. on Gateway to Globalization, Seattle.1995, 3:1515-1519[6]Liu Hui, Zoltowski M D. Blind equalization in antenna array CDMA systems[J].IEEE Trans. on Signal Proces.1997, 45(1):161-171[7]Wang K, Ge H. Joint estimation of time delays and DOAs for DS-CDMA system over Rayleigh fading channels. ICC, 2001, 5: 1436-1440.[8]Guenach M, Vandendorpe L. Tracking performance of DA and DD Multiuser timing synchronizers for short code DS-CDMA systems[J].IEEE J. on Selected Areas Comm.2001,19(12):2452-2461 -
计量
- 文章访问数: 2224
- HTML全文浏览量: 89
- PDF下载量: 654
- 被引次数: 0
下载:
