Patent ID: 9054845
Filing Date: 2015-06-09
Classification: H04L

Abstract:
1. A radio communication apparatus, comprising: a plurality of antennas; a receiver configured to receive, via the antennas, signals transmitted from a transmitter including a plurality of antennas; and a baseband processor configured to obtain channel estimates based on the received signals and perform signal detection based on the channel estimates according to a QRM-MLD (maximum likelihood detection employing QR decomposition and M-algorithm) method, wherein the baseband processor includes a stream separator configured to perform processes in a plurality of stages for the signal detection; wherein in a first stage, the stream separator detects a region to which a signal belongs, selects symbol candidates based on the detected region, and calculates metrics for the selected symbol candidates; wherein in a second stage, the stream separator selects symbol candidates based on the metrics calculated for the symbol candidates selected in the first stage; and wherein after starting calculation of the metrics for the symbol candidates selected in a previous repetition of a stage and before completing the calculation, the stream separator starts selecting symbol candidates for a next repetition of the stage based on metrics of surviving paths to which the symbol candidates whose metrics have been calculated belong.