Terminal station apparatus, base station apparatus, transmission method and control method
First 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.
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Accused Products
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.
13 Citations
18 Claims
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1. A terminal apparatus comprising:
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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; anda 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A transmitting method comprising:
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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; andtransmitting 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. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification