Patent ID: 9124325
Filing Date: 2015-09-01
Classification: H04B,H04L

Abstract:
1. A terminal apparatus comprising: a codeword generating section that encodes a data sequence to generate codewords; a receiving section that receives a response signal indicating a retransmission request for the codewords, the response signal being allocated to a response resource; an instructing section that instructs a precoder to be switched based on the number of retransmission requests for the same codeword or a switch instructing signal reported using the response resource; a precoding section that precodes the codeword using the precoder, based on the instruction to switch the precoder; and a transmitting section that transmits the precoded codeword, wherein (i) a first precoder used before the instructing section instructs the precoder to be switched is a precoder by which transmission data corresponding to the codeword is transmitted through specific antenna ports among a plurality of antenna ports of the terminal apparatus, and a second precoder used after the instructing section instructs the precoder to be switched is a precoder by which the transmission data is transmitted through all of the plurality of antenna ports, or (ii) the first precoder is a precoder by which phase rotation is not applied to the transmission data transmitted from antenna ports to which the same codeword is assigned, and the second precoder is a precoder by which phase rotation is applied to the transmission data transmitted from antenna ports to which the same codeword is assigned.