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 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.
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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.
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Citations
20 Claims
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1. A terminal apparatus comprising:
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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. - View Dependent Claims (2, 3)
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4. A terminal apparatus comprising:
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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. - View Dependent Claims (5, 6, 7, 8, 9, 10)
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11. A transmitting method comprising:
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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. - View Dependent Claims (12, 13)
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14. A transmitting method comprising:
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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. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification