Title :
An adaptive decision-feed back multiuser detector using parallel interference cancellation for CDMA systems
Author :
Huang, Yung-Fa ; Wen, Jyh-horng ; Wu, Hsien-Tsai
Author_Institution :
Inst. of Electr. Eng., Nat. Chung Cheng Univ., Chiayi, Taiwan
Abstract :
The cancellation-weight in a partial parallel interference cancellation (PPIC) multiuser detector is unable to exhaustively show the correctness of the bit-decision in the previous stage for direct-sequence code-division multiple-access (DS-CDMA) communication systems. Therefore, in this study, we investigate the cancellation-weight property based on the adaptation of the least mean square (LMS) algorithm and propose an adaptive decision-threshold to judge the correctness of the bit-decision in the previous stage. Furthermore, the bit-inversion procedure is proposed to reverse the incorrect bit-decision and thereby an adaptive decision-feedback full PIC (DF-FPIC) detector is proposed to fulfill the multiuser detection for CDMA systems. Simulation results show that the proposed multistage DF-FPIC detector is highly near-far resistant
Keywords :
adaptive signal detection; code division multiple access; decision theory; interference suppression; inverse problems; least mean squares methods; multiuser channels; radio receivers; radiofrequency interference; spread spectrum communication; CDMA systems; DS-CDMA; LMS algorithm; adaptive decision-feed back multiuser detector; adaptive decision-feedback full PIC detector; adaptive decision-threshold; bit-decision; bit-inversion procedure; cancellation-weight; direct-sequence code-division multiple-access; least mean square algorithm; multistage DF-FPIC detector; parallel interference cancellation; Degradation; Detectors; Error correction; Interference cancellation; Least squares approximation; Multiaccess communication; Multiple access interference; Multiuser detection; Power control; Statistics;
Conference_Titel :
Vehicular Technology Conference, 2001. VTC 2001 Spring. IEEE VTS 53rd
Conference_Location :
Rhodes
Print_ISBN :
0-7803-6728-6
DOI :
10.1109/VETECS.2001.944998
