Patent ID: 9554376
Date: 2017-01-24
CPC Classifications: H04B,H04J,H04L,H04W

Claim:
1. A communication apparatus comprising: a receiver which, in operation, receives a reference signal, which is generated at a terminal apparatus using an index related to a cyclic shift and a pair of coefficients in accordance with a selection signal, wherein the selection signal selects one of a first correspondence relationship and a second correspondence relationship, each defining a relationship between the index related to a cyclic shift and the pair of coefficients, the first correspondence relationship defines a first pair of coefficients corresponding to an even number index related to a cyclic shift and a second pair of coefficients corresponding to an odd number index related to a cyclic shift and the second correspondence relationship defines the first pair of coefficients corresponding to the odd number index related to a cyclic shift and the second pair of coefficients corresponding to the even number index related to a cyclic shift; and an estimator which, in operation, estimates a channel estimation value using the reference signal.