Method and apparatus for soft-decision detection in 2×2 MIMO system

摘要

A method for detecting soft-decisions in a 2×2 MIMO system includes detecting all candidate symbol vector sets S in which there exist all values of a real part and an imaginary part, and calculating a log-likelihood ratio (LLR) with respect to the candidate symbol vector sets S from;LLR⁡(bki)=mins∈S⋂βi,k-⁢ED⁡(s)2⁢σn2-mins∈S⋂βi,k+⁢ED⁡(s)2⁢σn2.

主权项

1. A method for detecting soft-decisions in a 2×2 MIMO system, the method comprising:
detecting all candidate symbol vector sets S for which there exist all values of a real part and an imaginary part; and calculating a log-likelihood ratio (LLR) with respect to the candidate symbol vector sets S fromLLR⁡(bki)=mins∈S⋂βi,k-⁢ED⁡(s)2⁢σn2-mins∈S⋂βi,k+⁢ED⁡(s)2⁢σn2,wherein
βi,k− represents a set having as elements those candidate symbol vectors in set S for which a kth bit of a symbol transmitted through an ith transmitter antenna is 0, βi,k+ represents a set having as elements those candidate symbol vectors in set S for which the kth bit of the symbol transmitted through the ith transmitter antenna is 1, and ED(s) represents a Euclidean distance for an element s of the candidate symbol vector set S.