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.
| Technology | Declaration Information | Specification Information | Explicitly Disclosed | Patent Type | |||||
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Specification Information
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| Publication No | Technology | Declaration Information | Specification Information | Explicitly Disclosed | Patent Type | Status | National Phase Entries | |||||
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Technologies
Signal Processing Resource configuration
Product
Use Cases
Wireless communication
Services
Claim
1. A terminal apparatus comprising:
circuitry, which, in operation, generates a reference signal using an orthogonal sequence associated with each of a plurality of layer numbers, the orthogonal sequence being one of a plurality of orthogonal sequences corresponding to a first orthogonal sequence [1, 1] and a second orthogonal sequence [1, ?1]; 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 circuitry, in operation, generates the reference signal using the orthogonal sequence, which is associated with each of the layer numbers by 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.
2. The terminal apparatus according to claim 1, wherein the circuitry, in operation, generates the reference signal using a cyclic shift value associated with each of the 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
the circuitry, in operation, generates the reference signal using the cyclic shift value, which is associated with each of the layer numbers by an association that:
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 associated with each of a plurality of layer numbers, the orthogonal sequence being one of a plurality of orthogonal sequences corresponding to a first orthogonal sequence [1, 1] and a second orthogonal sequence [1, ?1]; 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 circuitry, in operation, generates the reference signal using the orthogonal sequence, which is associated with each of the layer numbers by one of a plurality of associations including:
(i) a first association, in which the first to a Nw-th layer(s) are associated with the first orthogonal sequence, and a (Nw+1)-th and subsequent layer(s) are associated with the second orthogonal sequence; and
(ii) a second association, in which the first to the Nw-th layer(s) are associated with the second orthogonal sequence, and the (Nw+1)-th and subsequent layer(s) are associated with the first orthogonal sequence, 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 each of the 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
the circuitry, in operation, generates the reference signal using the cyclic shift value, which is associated with each of the layer numbers by an association that:
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.
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, the second layer, a third layer and a fourth layer, and when the Nw is 2:
in the first association, 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; and
in the second association, 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.
10. The terminal apparatus according to claim 4, wherein the layer numbers correspond to the first layer, the second layer, a third layer and a fourth layer, and when the Nw is 4:
in the first association, the first layer, the second layer, the third layer and the fourth layer are associated with the first orthogonal sequence; and
in the second association, the first layer, the second layer, the third layer and the fourth layer are associated with the second orthogonal sequence.
11. A transmitting method comprising:
generating a reference signal using an orthogonal sequence associated with each of a plurality of layer numbers, the orthogonal sequence being one of orthogonal sequences corresponding to a first orthogonal sequence [1, 1] and a second orthogonal sequence [1, ?1]; 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 reference signal is generated using the orthogonal sequence, which is associated with each of the layer numbers by 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.
12. The transmitting method according to claim 11, wherein the reference signal is generated using a cyclic shift value associated with each of the 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 associated with each of a plurality of layer numbers, the orthogonal sequence being one of a plurality of orthogonal sequences corresponding to a first orthogonal sequence [1, 1] and a second orthogonal sequence [1, ?1]; 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 reference signal is generated using the orthogonal sequence, which is associated with each of the layer numbers by one of a plurality of associations including:
(i) a first association, in which the first to a Nw-th layer(s) are associated with the first orthogonal sequence, and a (Nw+1)-th and subsequent layer(s) are associated with the second orthogonal sequence; and
(ii) a second association, in which the first to the Nw-th layer(s) are associated with the second orthogonal sequence, and the (Nw+1)-th and subsequent layer(s) are associated with the first orthogonal sequence, 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 each of the 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 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.
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, the second layer, a third layer and a fourth layer, and when the Nw is 2:
in the first association, 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; and
in the second association, 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.
20. The transmitting method according to claim 14, wherein the layer numbers correspond to the first layer, the second layer, a third layer and a fourth layer, and when the Nw is 4:
in the first association, the first layer, the second layer, the third layer and the fourth layer are associated with the first orthogonal sequence; and
in the second association, the first layer, the second layer, the third layer and the fourth layer are associated with the second orthogonal sequence.
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ClaimChart-US9413447B2-STO
Patent number:US9413447B2
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