A Low Complexity and Effective Rapid Channel Tracking Scheme for UWB Multiple-Access Systems

作者：Hung Ho Lung^*; Cheng Chia Hsin

来源：Wireless Personal Communications, 2014, 77(2): 923-949.

DOI：10.1007/s11277-013-1544-7

• Blind multiuser detection
• Multiple access interference
• Decision timing instant
• Minimum-mean-square-error
• Ultra-wideband system

In this paper, the applicability of the subspace-based blind adaptive algorithm in multiple access ultra-wideband systems is investigated. However, in the multiuser transmission environment, multiple access interference becomes a serious issue and results in the degradation of system performance. In order to overcome this shortcoming, we propose a novel and low complexity decision mechanism, termed the decision timing instant (DTI). A major advantage of the DTI algorithm is that it admits an adaptive implementation with low computational complexity instead of singular value decomposition. In the present paper, we exploit the joint blind multiuser detection in UWB systems, a combined scheme is proposed, which couples the minimum-mean-square-error and the DTI subspace tracking algorithm under UWB time-variant channels. Simulation results show that DTI is able to fast and precisely trace the variation of the channel environment and to improve the performance of the blind adaptive multiuser detection with a subspace approach over time-varying channels.

• 出版日期2014-7