| 摘要 |
A terminal apparatus is disclosed wherein even in a case of applying SU-MIMO and MU-MIMO at the same time, the inter-sequence interference in a plurality of pilot signals used by the same terminal can be suppressed to a low value, while the inter-sequence interference in pilot signal between terminals can be reduced. In this terminal apparatus: a pilot information deciding unit decides, based on allocation control information, Walsh sequences of the respective ones of first and second stream groups at least one of which includes a plurality of streams; and a pilot signal generating unit forms a transport signal by using the decided Walsh sequences to spread the streams included in the first and second stream groups. During this, Walsh sequences orthogonal to each other are established in the first and second stream groups, and users are allocated on a stream group-by-stream group basis. |
| 主权项 |
1. A communication apparatus comprising:
a transmitter, which, in operation, transmits, to a terminal, control information, which determines an association of an orthogonal sequence with each of layer numbers, a receiver, which, in operation, receives, from the terminal, a reference signal, which is generated using the orthogonal sequence based on the association determined by the control information, and which is multiplexed with a data signal having a bandwidth that is different from a bandwidth of a data signal transmitted by another terminal, the orthogonal sequence being one of a first orthogonal sequence [1, 1] and a second orthogonal sequence [1, −1], wherein the layer numbers correspond to a first layer, a second layer, a third layer and a fourth layer, and said control information determines one of a plurality of associations including: (i) a first association, in which the first orthogonal sequence is associated with each of the first layer and the second layer, and the second orthogonal sequence is associated with each of the third layer and the fourth layer; (ii) a second association, in which the second orthogonal sequence is associated with each of the first layer and the second layer, and the first orthogonal sequence is associated with each of the third layer and the fourth layer; (iii) a third association, in which the first orthogonal sequence is associated with each of the first layer, the second layer, the third layer and the fourth layer; and (iv) a fourth association, in which the second orthogonal sequence is associated with each of the first layer, the second layer, the third layer and the fourth layer. |
