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 a cyclic shift value and an orthogonal sequence, which are associated with each other for each of a plurality of layer numbers, the orthogonal sequence being one of two orthogonal sequences corresponding to a first orthogonal sequence [1, 1] and a second orthogonal sequence [1, ?1], and the cyclic shift value being one of 12 cyclic shift values ranging from 0 to 11, 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; and, 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; and
a transmitter, which, in operation, transmits the reference signal multiplexed with a data signal having a bandwidth, which is different from a bandwidth of a data signal transmitted by another terminal apparatus, wherein the circuitry, in operation, generates the reference signal using the cyclic shift value and the orthogonal sequence, which are associated with each other by an association that two cyclic shift values with a difference of 6 are respectively associated with the two orthogonal sequences for one of the layer numbers.
2. The terminal apparatus according to claim 1, wherein the layer numbers correspond to a first layer, a second layer, a third layer and a forth layer, and the circuitry, in operation, generates the reference signal using the orthogonal sequence, which is associated with each of the layer numbers by an association that:
the first layer and the second layer are associated with one of the two orthogonal sequences; and the third layer and the forth layer are associated with another of the two orthogonal sequences.
3. The terminal apparatus according to claim 1, wherein the circuitry, in operation, generates the reference signal using the orthogonal sequence, which is associated with each of the layer numbers by an association that:
a first to a Nw-th layer(s) are associated with one of the two orthogonal sequences; and a (Nw+1)-th and subsequent layer(s) are associated with another of the two orthogonal sequences, wherein Nw is a positive integer.
4. The terminal apparatus according to claim 3, wherein the Nw is variable.
5. The terminal apparatus according to claim 3, wherein a number of layers is 4, and the Nw is 2 or 4.
6. The terminal apparatus according to claim 1, wherein
the layer numbers correspond to a first layer, a second layer, a third layer and a forth layer, 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 1, wherein, for one of the layer numbers, a number of cyclic shift values associated with the first orthogonal sequence is same as a number of cyclic shift values associated with the second orthogonal sequence.
8. The terminal apparatus according to claim 1, wherein the circuitry, in operation, generates the reference signal using the cyclic shift value and the orthogonal sequence, which are associated with each other by an association that two adjacent cyclic shift values are respectively associated with the two orthogonal sequences for one of the layer numbers.
9. The terminal apparatus according to claim 8, wherein the two adjacent cyclic shift values are: 2 and 3; 3 and 4; 8 and 9; or 9 and 10.
10. A transmitting method comprising:
generating a reference signal using a cyclic shift value and an orthogonal sequence, which are associated with each other for each of a plurality of layer numbers, the orthogonal sequence being one of two orthogonal sequences corresponding to a first orthogonal sequence [1, 1] and a second orthogonal sequence [1, ?1], and the cyclic shift value being one of 12 cyclic shift values ranging from 0 to 11, 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; and, 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; and
transmitting the reference signal multiplexed with a data signal having a bandwidth, which is different from a bandwidth of a data signal transmitted by another terminal apparatus, wherein the reference signal is generated using the cyclic shift value and the orthogonal sequence, which are associated with each other by an association that two cyclic shift values with a difference of 6 are respectively associated with the two orthogonal sequences for one of the layer numbers.
11. The transmitting method according to claim 10, wherein the layer numbers correspond to a first layer, a second layer, a third layer and a forth layer, and the reference signal is generated using the orthogonal sequence, which is associated with each of the layer numbers by an association that:
the first layer and the second layer are associated with one of the two orthogonal sequences; and the third layer and the forth layer are associated with another of the two orthogonal sequences.
12. The transmitting method according to claim 10, wherein the reference signal is generated using the orthogonal sequence, which is associated with each of the layer numbers by an association that:
a first to a Nw-th layer(s) are associated with one of the two orthogonal sequences; and a (Nw+1)-th and subsequent layer(s) are associated with another of the two orthogonal sequences, wherein Nw is a positive integer.
13. The transmitting method according to claim 12, wherein the Nw is variable.
14. The transmitting method according to claim 12, wherein a number of layers is 4, and the Nw is 2 or 4.
15. The transmitting method according to claim 10, wherein the layer numbers correspond to a first layer, a second layer, a third layer and a forth layer, and the reference signal is generated 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.
16. The transmitting method according to claim 10, wherein, for one of the layer numbers, a number of cyclic shift values associated with the first orthogonal sequence is same as a number of cyclic shift values associated with the second orthogonal sequence.
17. The transmitting method according to claim 10, wherein the reference signal is generated using the cyclic shift value and the orthogonal sequence, which are associated with each other by an association that two adjacent cyclic shift values are respectively associated with the two orthogonal sequences for one of the layer numbers.
18. The transmitting method according to claim 17, wherein the two adjacent cyclic shift values are: 2 and 3; 3 and 4; 8 and 9; or 9 and 10.
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The information in blue was extracted from the third parties (Standard Setting Organisation, Espacenet)
The information in grey was provided by the patent holder
The information in purple was extracted from the FrandAvenue
Explicitly disclosed patent:openly and comprehensibly describes all details of the invention in the patent document.
Implicitly disclosed patent:does not explicitly state certain aspects of the invention, but still allows for these to be inferred from the information provided.
Basis patent:The core patent in a family, outlining the fundamental invention from which related patents or applications originate.
Family member:related patents or applications that share a common priority or original filing.