Title :
Soft decision feedback receiver for CDMA communication in multipath
Author :
Kim, Young-Hoon ; Shamsunder, Sanyogita
Author_Institution :
Dept. of Electr. Eng., Colorado State Univ., Fort Collins, CO, USA
Abstract :
Multipath fading in wireless code division multiple access (CDMA) systems worsens the effects of multiple access interference and also leads to the near-far problem. To improve the performance of the detector based on the bank of correlators, in this paper, a post processing structure is proposed for synchronous CDMA systems observed in multipath. The proposed receiver consists of conventional correlator detectors and matrix filters that feedback previous decisions. To minimize the error propagation phenomenon in the decision feedback receiver, a soft decision mapping is proposed. The performance of the proposed receiver structure with the soft decisions is studied via simulations
Keywords :
adaptive signal detection; adaptive signal processing; channel bank filters; code division multiple access; correlators; fading channels; feedback; filtering theory; interference suppression; matched filters; multipath channels; radio receivers; radiofrequency interference; spread spectrum communication; DS-CDMA communication; PN spread spectrum sequence; adaptive decision feedback detector; correlator detectors; detector performance; direct sequence spread spectrum; error propagation; interference suppression; matched filter; matrix filters; multipath fading; multiple access interference; near-far problem; post processing structure; simulations; soft decision feedback receiver; soft decision mapping; synchronous CDMA systems; Correlators; Degradation; Detectors; Fading; Feedback; Finite impulse response filter; Multiaccess communication; Multiple access interference; Wireless LAN; Wireless communication;
Conference_Titel :
Vehicular Technology Conference, 1998. VTC 98. 48th IEEE
Conference_Location :
Ottawa, Ont.
Print_ISBN :
0-7803-4320-4
DOI :
10.1109/VETEC.1998.686047
