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US 2019/0165840 A1Published application
Receiving method and receiving apparatus
AssigneeSun Patent Trust
InventorsYutaka MURAKAMI, Tomohiro KIMURA, Mikihiro OUCHI
Life of this patent
Estimating the term…
Abstract
All data symbols used in data transmission of a modulated signal are precoded by switching between precoding matrices so that the precoding matrix used to precode each data symbol and the precoding matrices used to precode data symbols that are adjacent to the data symbol along the frequency axis and the time axis all differ. A modulated signal with such data symbols arranged therein is transmitted.
Claims6
(canceled)
(canceled)
A transmission method comprising:
- modulating first data bits corresponding to a first layer to first complex-valued modulated symbols s1(t) and the second data bits corresponding to a second layer to second complex-valued modulated symbols s2(t);
- performing precoding process on the first complex-valued modulated symbols s1(t) and the second complex-valued modulated symbols s2(t) to generate first precoded symbols z1(t) and second precoded symbols z2(t), t being an integer equal to or greater than 0, the precoding process using a matrix with matrix elements regularly phase-changed by i, i being an integer between 0 and N−1, N being an integer 2 or greater and i changing according to t;
- and
- transmitting the first precoded symbols z1 (t) and the second precoded symbols z2 (t) from different antennas, wherein
- the precoding process is expressed by the following equation 1:
- [
- z
-
-
- 1
-
- (
- t
- )
- z
-
-
- 2
-
- (
- t
- )
- ]
- =
- 1
- 2
-
- [
- 1
- 1
- 1
- 1
- e
- j
-
-
- θ
-
-
- i
- e
- j
-
-
- θ
-
-
- i
- e
- j
-
- (
- θ
-
-
- i
- +
- π
- )
- e
- j
-
- (
- θ
-
-
- i
- +
- π
- )
- ]
-
- [
- Is
-
-
- 1
-
- (
- t
- )
- Qs
-
-
- 1
-
- (
- t
- )
- Is
-
-
- 2
-
- (
- t
- )
- Qs
-
-
- 2
-
- (
- t
- )
- ]
- ,
- (
- 1
- )
- where θ is a value expressed in radians,
- Is1(t) is in-phase component of s1(t),
- Qs1(t) is quadrature component of s1(t),
- Is2(t) is in-phase component of s2(t) and
- Qs2(t) is quadrature component of s2(t).
112 more elements
A transmission apparatus comprising:
- modulation circuitry, which, in operation, modulates first data bits corresponding to a first layer to a first complex-valued modulated symbols s1(t) and second data bits corresponding to a second layer to a second complex-valued modulated symbols s2(t);
- precoding circuitry which, in operation, performs precoding process on the first complex-valued modulated symbols s1(t) and the second complex-valued modulated symbols s2(t) to generate a first precoded symbols z1(t) and a second precoded symbols z2(t), t being an integer equal to or greater than 0, the precoding process using a matrix with matrix elements regularly phase-changed by i, i being an integer between 0 and N−1, N being an integer 2 or greater and i changing according to t;
- and
- transmission circuitry, which, in operation, transmits the first precoded symbols z1 (t) and the second precoded symbols z2 (t) from different antennas, wherein
- the precoding process is expressed by the following equation 2:
- [
- z
-
-
- 1
-
- (
- t
- )
- z
-
-
- 2
-
- (
- t
- )
- ]
- =
- 1
- 2
-
- [
- 1
- 1
- 1
- 1
- e
- j
-
-
- θ
-
-
- i
- e
- j
-
-
- θ
-
-
- i
- e
- j
-
- (
- θ
-
-
- i
- +
- π
- )
- e
- j
-
- (
- θ
-
-
- i
- +
- π
- )
- ]
-
- [
- Is
-
-
- 1
-
- (
- t
- )
- Qs
-
-
- 1
-
- (
- t
- )
- Is
-
-
- 2
-
- (
- t
- )
- Qs
-
-
- 2
-
- (
- t
- )
- ]
- ,
- (
- 2
- )
- where θ is a value expressed in radians,
- Is1(t) is in-phase component of the first complex-valued modulated symbols s1(t),
- Qs1(t) is quadrature component of the first complex-valued modulated symbols s1(t),
- Is2(t) is in-phase component of the second complex-valued modulated symbols s2(t) and
- Qs2(t) is quadrature component of the second complex-valued modulated symbols s2(t).
112 more elements
A reception method comprising:
- receiving a first precoded symbols z1(t) and a second precoded symbols z2(t);
- and
- demodulating the first precoded symbols z1(t) and the second precoded symbols z1(t) to generate first data bits corresponding to a first layer and second data bits corresponding to a second layer, wherein
- the first precoded symbols z1(t) and the second precoded symbols z2(t) are generated by:
- modulating the first data bits to first complex-valued modulated symbols s1(t) and the second data bits to second complex-valued modulated symbols s2(t);
- performing precoding process on the first complex-valued modulated symbols s1(t) and the second complex-valued modulated symbols s2(t) to generate first precoded symbols z1(t) and second precoded symbols z2(t), t being an integer equal to or greater than 0, the precoding process using a matrix with matrix elements regularly phase-changed by i, i being an integer between 0 and N−1, N being an integer 2 or greater and i changing according to t;
- and
- transmitting the first precoded symbols z1 (t) and the second precoded symbols z2 (t) from different antennas, and
- the precoding process is expressed by the following equation 3:
- [
- z
-
-
- 1
-
- (
- t
- )
- z
-
-
- 2
-
- (
- t
- )
- ]
- =
- 1
- 2
-
- [
- 1
- 1
- 1
- 1
- e
- j
-
-
- θ
-
-
- i
- e
- j
-
-
- θ
-
-
- i
- e
- j
-
- (
- θ
-
-
- i
- +
- π
- )
- e
- j
-
- (
- θ
-
-
- i
- +
- π
- )
- ]
-
- [
- Is
-
-
- 1
-
- (
- t
- )
- Qs
-
-
- 1
-
- (
- t
- )
- Is
-
-
- 2
-
- (
- t
- )
- Qs
-
-
- 2
-
- (
- t
- )
- ]
- ,
- (
- 3
- )
- where θ is a value expressed in radians,
- Is1(t) is in-phase component of the first complex-valued modulated symbols s1(t),
- Qs1(t) is quadrature component of the first complex-valued modulated symbols s1(t),
- Is2(t) is in-phase component of the second complex-valued modulated symbols s2(t) and
- Qs2(t) is quadrature component of the second complex-valued modulated symbols s2(t).
116 more elements
A reception apparatus comprising:
- reception circuitry, which, in operation, receives a first precoded symbols z1(t) and a second precoded signal;
- and
- demodulation circuitry which, in operation, demodulates the first precoded symbols z1(t) and the second precoded symbols z2(t) to generate first data bits corresponding to a first layer and second data bits corresponding to a second layer, wherein
- the first precoded symbols z1(t) and the second precoded symbols z2(t) are generated by:
- modulating the first data bits to first complex-valued modulated symbols s1(t) and the second data bits to second complex-valued modulated symbols s2(t);
- performing precoding process on the first complex-valued modulated symbols s1(t) and the second complex-valued modulated symbols s2(t) to generate first precoded symbols z1(t) and second precoded symbols z2(t), t being an integer equal to or greater than 0, the precoding process using a matrix with matrix elements regularly phase-changed by i, i being an integer between 0 and N−1, N being an integer 2 or greater and i changing according to t;
- and
- transmitting the first precoded symbols z1 (t) and the second precoded symbols z2 (t) from different antennas, and
- the precoding process is expressed by the following equation 4:
- [
- z
-
-
- 1
-
- (
- t
- )
- z
-
-
- 2
-
- (
- t
- )
- ]
- =
- 1
- 2
-
- [
- 1
- 1
- 1
- 1
- e
- j
-
-
- θ
-
-
- i
- e
- j
-
-
- θ
-
-
- i
- e
- j
-
- (
- θ
-
-
- i
- +
- π
- )
- e
- j
-
- (
- θ
-
-
- i
- +
- π
- )
- ]
-
- [
- Is
-
-
- 1
-
- (
- t
- )
- Qs
-
-
- 1
-
- (
- t
- )
- Is
-
-
- 2
-
- (
- t
- )
- Qs
-
-
- 2
-
- (
- t
- )
- ]
- ,
- (
- 4
- )
- where θ is a value expressed in radians,
- Is1(t) is in-phase component of the first complex-valued modulated symbols s1(t),
- Qs1(t) is quadrature component of the first complex-valued modulated symbols s1(t),
- Is2(t) is in-phase component of the second complex-valued modulated symbols s2(t) and
- Qs2(t) is quadrature component of the second complex-valued modulated symbols s2(t).
116 more elements
Dependencies are inferred from the claim text.