Patent ID: 8068560

Claim:
A QR decomposition apparatus used for a receiver in a Multiple Input Multiple Output (MIMO) system, comprising: a norm multiplier for calculating a norm and outputting the norm of a received MIMO signal; a Q column multiplier for calculating a column value of a unitary matrix Q to thereby produce a Q matrix vector; a first storage for storing the Q matrix vector calculated in the Q column multiplier; an R row multiplier for calculating a value of an upper triangular R matrix by multiplying the Q matrix vector by a reception signal vector; and a Q update multiplier for receiving the reception signal vector and an output of the R row multiplier, calculating an Q update value through an accumulation operation, and providing the Q update value to the Q column multiplier to calculate a next Q matrix vector; wherein the norm multiplier updates a norm to be used in a next cycle based on an output of the Q update multiplier.