关键词: MIMO, 格基约减, 预编码

Abstract:

LLL lattice reduction is a powerful algorithm which can output a group of nearly orthogonal reduced lattice basis from original basis.Recently,LLL lattice reduction has been found useful for precoding in wireless MIMO systems.There is a factor δ in LLL lattice reduction which should be specified manually.Algorithm execution time and quality of reduced lattice basis depend on the factor δ.On the base of the LLL lattice reduction algorithm,this paper propose an improved algorithm for choosing the factor δ automatically according to a specific input matrix H to meet the tradeoff between the quality of reduced lattice basis and algorithm execution time.

Key words: MIMO;lattice reduction;precoding