Title :
Multi-channel soft decision feedback with application to multi-user CDMA
Author :
Shamsunder, Sanyogita ; Kim, Young-Hoon
Author_Institution :
Dept. of Electr. Eng., Colorado State Univ., Fort Collins, CO, USA
Abstract :
A new approach based on joint entropy maximization (JEM) is taken in order to introduce a soft decision device in a decision feedback equalizer (DFE) for a multi-input, multi-output communication channel. Previously reported results for single channel DFE are extended to the multi-channel case and the appropriate choice of the soft decision mapping is discussed. Additionally, the DF filter with soft decision is applied for interference suppression in code division multiple access (CDMA) systems. Simulation results show that the blind algorithms with the soft decision outperform the one with the hard decision
Keywords :
MIMO systems; blind equalisers; code division multiple access; decision feedback equalisers; interference suppression; maximum entropy methods; multiuser channels; spread spectrum communication; DF filter; DS-CDMA; MIMO communication channel; blind algorithms; code division multiple access; decision feedback equalizer; hard decision; interference suppression; joint entropy maximization; mobile data transmission; multi-channel DFE; multi-channel soft decision feedback; multi-input multi-output communication channel; multi-user CDMA; simulation results; single channel DFE; soft decision device; soft decision mapping; Communication channels; Convergence; Decision feedback equalizers; Entropy; Finite impulse response filter; Interference suppression; MIMO; Mobile communication; Multiaccess communication; Pulse modulation;
Conference_Titel :
Universal Personal Communications, 1998. ICUPC '98. IEEE 1998 International Conference on
Conference_Location :
Florence
Print_ISBN :
0-7803-5106-1
DOI :
10.1109/ICUPC.1998.733688
