Research on a Linear Precoding Method of Multiuser Multipleª²Input Multipleª²Output
Downlink Systems
Meng Yinkuo£¬Yin Qinye£¬Ding Le£¬Deng Ke
£¨School of Electronics and Information Engineering£¬Xi'an¡¡Jiaotong¡¡University£¬Xi'an
710049£¬China£©
Abstract£ºFor the problem that the suppression of coª²channel interference and
suppression of noise can¡¯t be balanced in signalª²toª²jamming and noise ratio £¨SJNR£©
maximization method for the linear precoding of multiuser multipleª²input multipleª²output
£¨MIMO£© downlink systems£¬ an improved scheme that the term of noise variance is
modified as a piecewise linear function is proposed£¬ in which the balance between
suppression of coª²channel interference and suppression of noise can still be maintained
even when the noise variance is a small value through piecewise modifying the term of
noise variance£¬ and thus the bit error rate and capacity of the systems are further
improved£® Simulation results show that compared with the SJNR method£¬ for a multiuser
MIMO downlink system with five base station antennas and three mobile users with two
antennas for each£¬ the proposed scheme can obtain 2 dB gains when the average bit error
rate is at 10-4 level£¬ and the ergodic capacity can be increased by 1 b·£¨s·Hz£©-1
if signalª²toª²noise ratio is 10 dB£®
Keywords£ºmultipleª²input multipleª²output£» multiª²user£» downlink£» linear
precoding