Apparatus and method for generating and transmitting reference signal in radio communication

摘要

It is possible to provide a radio communication terminal device and a radio transmission method which can improve reception performance of a CQI and a reference signal. A phase table storage unit stores a phase table which correlates the amount of cyclic shift to complex coefficients {w1, w2} to be multiplied on the reference signal. A complex coefficient multiplication unit reads out a complex coefficient corresponding to the amount of cyclic shift indicated by resource allocation information, from the phase table storage unit and multiplies the read-out complex coefficient on the reference signal so as to change the phase relationship between the reference signals in a slot.

主权项

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.