Patent ID: 8526546
Filing Date: 2013-09-03
Classification: H04B,H04J,H04L,H04W

Abstract:
1. A radio communication method comprising: receiving an acknowledgement or non-acknowledgement (ACK/NACK) signal that is spread with an orthogonal sequence, which is selected from a plurality of orthogonal sequences, the plurality of orthogonal sequences including more orthogonal sequences that render two values respectively corresponding to Nth symbol and Mth symbol of an ACK/NACK signal transmission slot in phase, than orthogonal sequence(s) that render said two values in opposite phases from each other; despreading, with said orthogonal sequence, the spread ACK/NACK signal in the ACK/NACK signal transmission slot; receiving two reference signals (RS), which are produced by multiplying two reference signal sequences with values having opposite phases from each other and which are arranged in the Nth symbol and the Mth symbol of a CQI signals transmission slot, and receiving channel quality indicator (CQI) signals arranged in symbols of the CQI signals transmission slot other than the Nth symbol and the Mth symbol; and demodulating the CQI signals arranged in the CQI signals transmission slot.