| 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, in operation, transmits, to a terminal, control information, which determines an association of each of layer numbers with one of orthogonal sequences; and a receiver, which, in operation, receives, which, in operation, receives a reference signal, which is generated using an orthogonal sequence for each of the layer numbers based on the association determined by the control information, and which is transmitted, from the terminal, and 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 a first orthogonal sequence [1, 1] or a second orthogonal sequence [1, −1], wherein: when the first orthogonal sequence is used, the reference signal transmitted on a first slot is multiplied by 1, and the reference signal transmitted on a second slot is multiplied by 1; when the second orthogonal sequence is used, the reference signal transmitted on the first slot is multiplied by 1, and the reference signal transmitted on the second slot is multiplied by −1; the layer numbers correspond to a first layer, a second layer, a third layer and a fourth layer; when two layers are assigned to the terminal, the first layer and the second layer are used; and said control information determines one of a plurality of associations including: (i) a first association, in which the first layer and the second layer are associated with the first orthogonal sequence, and the third layer and the fourth layer are associated with the second orthogonal sequence; (ii) a second association, in which the first layer and the second layer are associated with the second orthogonal sequence, and the third layer and the fourth layer are associated with the first orthogonal sequence; (iii) a third association, in which all layers including the first layer, the second layer, the third layer and the fourth layer are associated with the first orthogonal sequence; and (iv) a fourth association, in which all layers including the first layer, the second layer, the third layer and the fourth layer are associated with the second orthogonal sequence. |
