Patent ID: 8321742
Filing Date: 2012-11-27
Classification: H04L

Abstract:
1. An adaptive automatic repeat-request apparatus for a multiple input multiple output (MIMO) system, said MIMO system including a transmitter and a receiver, said apparatus comprising: an adaptive retransmission component located at said transmitter, including a special frame structure in which transmission data in a frame is divided into a plurality of data sections according to the number of a plurality of transmission antennas, and an individual error detecting code is added to the end of each data section, said transmission data being sent to said receiver through said plurality of transmission antennas; wherein said receiver feeds back an acknowledgement (ACK) or at least one negative acknowledgement (NACK) to said adaptive retransmission component, said adaptive retransmission component determines that a data section transmitted by one of said plurality of transmission antenna is properly received at said receiver and no retransmission is required if said ACK signal is received, and said data section transmitted is not properly received at said receiver if said at least one NACK signal is received, and retransmitting at least an error data section in an error frame with duplicated retransmission by all or other transmission antennas of said plurality of transmission antennas; and wherein said adaptive retransmission component determines at least a retransmission signal vector for error data according to feedback information from said receiver about a distribution order of spatial signal strength for said plurality of transmission antennas, and if two or more NACK signals are received, said at least an error data section with weakest spatial signal strength is selected for duplicated retransmission by other transmission antennas that have transmitted data correctly in previous transmission.