Abstract
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.
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Technologies
Resource configuration
Product
Use Cases
Services
Claim
1. A terminal apparatus comprising:
circuitry, which, in operation, generates a reference signal using an orthogonal sequence, which is associated with one of a plurality of layer numbers based on one of a plurality of associations; and a transmitter, which, in operation, transmits the reference signal multiplexed with a data signal having a bandwidth that is different from a bandwidth of a data signal transmitted by another terminal apparatus, wherein the layer numbers correspond to a first layer, a second layer, a third layer and a fourth layer, and the plurality of associations include:
(i) a first association, in which the orthogonal sequence of [1, 1] is associated with the first layer, the orthogonal sequence of [1, 1] is associated with the second layer, the orthogonal sequence of [1, ?1] is associated with the third layer, and the orthogonal sequence of [1, ?1] is associated with the fourth layer;
(ii) a second association, in which the orthogonal sequence of [1, ?1] is associated with the first layer, the orthogonal sequence of [1, ?1] is associated with the second layer, the orthogonal sequence of [1, 1] is associated with the third layer, and the orthogonal sequence of [1, 1] is associated with the fourth layer;
(iii) a third association, in which the orthogonal sequence of [1, 1] 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 orthogonal sequence of [1, ?1] is associated with each of the first layer, the second layer, the third layer and the fourth layer.
2. The terminal apparatus according to claim 1, wherein the circuitry, in operation, generates the reference signal using a cyclic shift value associated with the one of the plurality of layer numbers.
3. The terminal apparatus according to claim 2, wherein the cyclic shift value is one of 12 cyclic shifts values ranging from 0 to 11, and
a difference between cyclic shift values, with which the first layer and the second layer are respectively associated, is 6; a difference between cyclic shift values, with which the third layer and the fourth layer are respectively associated, is 6; and a difference between cyclic shift values, with which the first layer and the third layer are respectively associated, is 3.
4. A terminal apparatus comprising:
circuitry, which, in operation, generates a reference signal using an orthogonal sequence, which is associated with one of a plurality of layer numbers based on one of a plurality of associations; and a transmitter, which, in operation, transmits the reference signal multiplexed with a data signal having a bandwidth that is different from a bandwidth of a data signal transmitted by another terminal apparatus, wherein the layer numbers are consecutive numbers, and the plurality of associations include:
(i) a first association, in which the orthogonal sequence of [1, 1] is associated with the first to a Nw-th layer(s), and the orthogonal sequence of [1, ?1] is associated with a (Nw+1)-th and subsequent layer(s); and
(ii) a second association, in which the orthogonal sequence of [1, ?1] is associated with the first to a Nw-th layer(s), and the orthogonal sequence of [1, 1] is associated with a (Nw+1)-th and subsequent layer(s),
wherein Nw is a positive integer.
5. The terminal apparatus according to claim 4, wherein the circuitry, in operation, generates the reference signal using a cyclic shift value associated with the one of the plurality of layer numbers.
6. The terminal apparatus according to claim 5, wherein the cyclic shift value is one of 12 cyclic shifts values ranging from 0 to 11, and
a difference between cyclic shift values, with which the first layer and a second layer are respectively associated, is 6; a difference between cyclic shift values, with which a third layer and a fourth layer are respectively associated, is 6; and a difference between cyclic shift values, with which the first layer and the third layer are respectively associated, is 3.
7. The terminal apparatus according to claim 4, wherein the Nw is variable.
8. The terminal apparatus according to claim 4, wherein a number of layers is 4, and the Nw is 2 or 4.
9. The terminal apparatus according to claim 4, wherein the layer numbers correspond to the first layer, a second layer, a third layer and a fourth layer, and when the Nw is 2:
in the first association, the orthogonal sequence of [1, 1] is associated with the first layer, the orthogonal sequence of [1, 1] is associated with the second layer, the orthogonal sequence of [1, ?1] is associated with the third layer, and the orthogonal sequence of [1, ?1] is associated with the fourth layer; and in the second association, the orthogonal sequence of [1, ?1] is associated with the first layer, the orthogonal sequence of [1, ?1] is associated with the second layer, the orthogonal sequence of [1, 1] is associated with the third layer, and the orthogonal sequence of [1, 1] is associated with the fourth layer.
10. The terminal apparatus according to claim 4, wherein the layer numbers correspond to the first layer, a second layer, a third layer and a fourth layer, and when the Nw is 4:
in the first association, the orthogonal sequence of [1, 1] is associated with each of the first layer, the second layer, the third layer and the fourth layer; and in the second association, the orthogonal sequence of [1, ?1] is associated with each of the first layer, the second layer, the third layer and the fourth layer.
11. A transmitting method comprising:
generating a reference signal using an orthogonal sequence, which is associated with one of a plurality of layer numbers based on one of a plurality of associations; and transmitting, from a terminal, the reference signal multiplexed with a data signal having a bandwidth that is different from a bandwidth of a data signal transmitted by another terminal, wherein the layer numbers correspond to a first layer, a second layer, a third layer and a fourth layer, and the plurality of associations include:
(i) a first association, in which the orthogonal sequence of [1, 1] is associated with the first layer, the orthogonal sequence of [1, 1] is associated with the second layer, the orthogonal sequence of [1, ?1] is associated with the third layer, and the orthogonal sequence of [1, ?1] is associated with the fourth layer;
(ii) a second association, in which the orthogonal sequence of [1, ?1] is associated with the first layer, the orthogonal sequence of [1, ?1] is associated with the second layer, the orthogonal sequence of [1, 1] is associated with the third layer, and the orthogonal sequence of [1, 1] is associated with the fourth layer;
(iii) a third association, in which the orthogonal sequence of [1, 1] 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 orthogonal sequence of [1, ?1] is associated with each of the first layer, the second layer, the third layer and the fourth layer.
12. The transmitting method according to claim 11, wherein the reference signal is generated using a cyclic shift value associated with the one of the plurality of layer numbers.
13. The transmitting method according to claim 12, wherein the cyclic shift value is one of 12 cyclic shifts values ranging from 0 to 11, and
a difference between cyclic shift values, with which the first layer and the second layer are respectively associated, is 6, a difference between cyclic shift values, with which the third layer and the fourth layer are respectively associated, is 6, and a difference between cyclic shift values, with which the first layer and the third layer are respectively associated, is 3.
14. A transmitting method comprising:
generating a reference signal using an orthogonal sequence, which is associated with one of a plurality of layer numbers based on one of a plurality of associations; and transmitting, from a terminal, the reference signal multiplexed with a data signal having a bandwidth that is different from a bandwidth of a data signal transmitted by another terminal, wherein the layer numbers are consecutive numbers, and the plurality of associations include:
(i) a first association, in which the orthogonal sequence of [1, 1] is associated with the first to a Nw-th layer(s), and the orthogonal sequence of [1, ?1] is associated with a (Nw+1)-th and subsequent layer(s); and
(ii) a second association, in which the orthogonal sequence of [1, ?1] is associated with the first to a Nw-th layer(s), and the orthogonal sequence of [1, 1] is associated with a (Nw+1)-th and subsequent layer(s),
wherein Nw is a positive integer.
15. The transmitting method according to claim 14, wherein the reference signal is generated using a cyclic shift value associated with the one of the plurality of layer numbers.
16. The transmitting method according to claim 15, wherein the cyclic shift value is one of 12 cyclic shifts values ranging from 0 to 11, and
a difference between cyclic shift values, with which the first layer and a second layer are respectively associated, is 6, a difference between cyclic shift values, with which a third layer and a fourth layer are respectively associated, is 6, and a difference between cyclic shift values, with which the first layer and the third layer are respectively associated, is 3.
17. The transmitting method according to claim 14, wherein the Nw is variable.
18. The transmitting method according to claim 14, wherein a number of layers is 4, and the Nw is 2 or 4.
19. The transmitting method according to claim 14, wherein the layer numbers correspond to the first layer, a second layer, a third layer and a fourth layer, and when the Nw is 2:
in the first association, the orthogonal sequence of [1, 1] is associated with the first layer, the orthogonal sequence of [1, 1] is associated with the second layer, the orthogonal sequence of [1, ?1] is associated with the third layer, and the orthogonal sequence of [1, ?1] is associated with the fourth layer; and in the second association, the orthogonal sequence of [1, ?1] is associated with the first layer, the orthogonal sequence of [1, ?1] is associated with the second layer, the orthogonal sequence of [1, 1] is associated with the third layer, and the orthogonal sequence of [1, 1] is associated with the fourth layer.
20. The transmitting method according to claim 14, wherein the layer numbers correspond to the first layer, a second layer, a third layer and a fourth layer, and when the Nw is 4:
in the first association, the orthogonal sequence of [1, 1] is associated with each of the first layer, the second layer, the third layer and the fourth layer; and in the second association, the orthogonal sequence of [1, ?1] is associated with each of the first layer, the second layer, the third layer and the fourth layer.
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