Title :
Multipath-free Detector for Multiuser Impulse UWB Systems with Recursive Least Squares LMF Algorithm
Author :
Zheng, Lin ; Ouyang, Shan
Author_Institution :
Sch. of Telecomm. Eng., Xidian Univ., Xi´´an
Abstract :
Multiple access and multipath fading present major challenges for UWB in terms of both technological capability and implementation complexity. In this paper, we develop a multipath-free scheme, which provides a simple approach to select samples of received signals. By this scheme, the subsequent multiuser detection (MUD) would escape from the mismatch due to the correlative multipath signal in impulse ultra-wideband (IR-UWB) multiuser systems. In addition, a computationally efficient recursive least squares (RLS) type algorithm based on least mean fourth (LMF) criterion is derived to suppress multiaccess interference. The proposed multiuser receiver exhibits good performance at low complexity, even in dense multipath environment
Keywords :
broadband networks; fading channels; least squares approximations; multipath channels; multiuser detection; radio receivers; radiofrequency interference; recursive estimation; signal sampling; ultra wideband communication; IR-UWB; LMF algorithm; MUD; RLS algorithm; impulse radio ultrawideband system; least mean fourth criterion; multiaccess interference suppression; multipath fading; multipath-free detector; multiuser detection; multiuser receiver; recursive least squares; signal sampling; Adaptive algorithm; Bit error rate; Detectors; Electronic mail; Filters; Least squares methods; Multiaccess communication; Multiuser detection; Pulse modulation; Time-varying channels;
Conference_Titel :
Communications, Circuits and Systems Proceedings, 2006 International Conference on
Conference_Location :
Guilin
Print_ISBN :
0-7803-9584-0
Electronic_ISBN :
0-7803-9585-9
DOI :
10.1109/ICCCAS.2006.284881
