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US 9,729,217 B2Granted
Pre-coding method and transmitter
AssigneeSun Patent Trust
InventorsYutaka Murakami, Tomohiro Kimura, Mikihiro Ouchi
Life of this patent
Estimating the term…
Abstract
Disclosed is a transmission scheme for transmitting a first modulated signal and a second modulated signal over the same frequency at the same time. According to the transmission scheme, a precoding weight multiplying unit multiplies a baseband signal after a first mapping and a baseband signal after a second mapping by a precoding weight and outputs the first modulated signal and the second modulated signal. In the precoding weight multiplying unit, precoding weights are regularly hopped.
Claims7
A method for generating a plurality of signals, generation of the plurality of signals comprising:
- selecting whether to perform a precoding process;
- selecting one matrix from among N matrices F[i], wherein i is an integer no less than 0 and no more than N−1, and N is an integer 3 or greater, by hopping between the matrices over each of a plurality of slots, the N matrices F[i] defining the precoding process that is performed on a plurality of baseband signals when the precoding process is performed;
- and
- generating a first precoded signal z1 and a second precoded signal z2 by performing the precoding process, which corresponds to the matrix selected from among the N matrices F[i], over each of the plurality of slots on a first baseband signal s1 included in the plurality of baseband signals and a second baseband signal s2 included in the plurality of baseband signals,
- the first precoded signal z1 and the second precoded signal z2 satisfying (z1, z2)T=F[i] (s1, s2)T,
- the N matrices F[i] being expressed as:
- F
-
- [
- i
- ]
- =
- 1
- α
- 2
- +
- 1
-
- (
- ⅇ
- j
-
-
- θ
- 11
-
- (
- i
- )
- α
- ×
- ⅇ
- j
-
- (
- θ
- 11
-
- (
- i
- )
- +
- λ
- )
- α
- ×
- ⅇ
- j
-
-
- θ
- 21
-
- (
- i
- )
- ⅇ
- j
-
- (
- θ
- 21
-
- (
- i
- )
- +
- λ
- +
- π
- )
- )
- λ representing an arbitrary angle, α representing a positive real number, θ11(i) and θ21(i) satisfying:
- ej(θ11(x)−θ21(x))≠ej(θ11(y)−θ21(y))
- wherein x and y are any integers no less than 0 and no more than N−1 satisfying x≠y,
- each of the N matrices being selected at least once in a predetermined number of slots, a result of the selecting whether to perform the precoding process, the first precoded signal z1, and the second precoded signal z2 being transmitted from a first antenna and a second antenna respectively in the same frequency at the same time.
73 more elements
A signal generating apparatus comprising:
- a selector that selects whether to perform a precoding process;
- select one matrix from among N matrices F[i], wherein i is an integer no less than 0 and no more than N−1, and N is an integer 3 or greater, by hopping between the matrices over each of a plurality of slots, the N matrices F[i] defining the precoding process that is performed on a plurality of baseband signals when the precoding process is performed;
- and
- generate a first precoded signal z1 and a second precoded signal z2 by performing the precoding process, which corresponds to the matrix selected from among the N matrices F[i], over said each of the plurality of slots on a first baseband signal s1 included in the plurality of baseband signals and a second baseband signal s2 included in the plurality of baseband signals,
- the first precoded signal z1 and the second precoded signal z2 satisfying (z1, z2)T=F[i] (s1, s2)T,
- the N matrices F[i] being expressed as:
- F
-
- [
- i
- ]
- =
- 1
- α
- 2
- +
- 1
-
- (
- ⅇ
- j
-
-
- θ
- 11
-
- (
- i
- )
- α
- ×
- ⅇ
- j
-
- (
- θ
- 11
-
- (
- i
- )
- +
- λ
- )
- α
- ×
- ⅇ
- j
-
-
- θ
- 21
-
- (
- i
- )
- ⅇ
- j
-
- (
- θ
- 21
-
- (
- i
- )
- +
- λ
- +
- π
- )
- )
- λ representing an arbitrary angle, a representing a positive real number, θ11(i) and θ21(i) satisfying:
- ej(θ11(x)−θ21(x))≠ej(θ11(y)−θ21(y))
- wherein x and y are any integers no less than 0 and no more than N−1 satisfying x≠y,
- each of the N matrices being selected at least once in a predetermined number of slots, a result of the selecting whether to perform the precoding process, the first precoded signal z1, and the second precoded signal z2 being transmitted from a first antenna and a second antenna respectively in the same frequency at the same time.
73 more elements
A signal generating apparatus comprising:
- a memory;
- at least one integrated circuit;
- wherein the at least one integrated circuit is configured to execute at least one program stored on the memory to:
- select whether to perform a precoding process;
- select one matrix from among N matrices F[i], wherein i is an integer no less than 0 and no more than N-1, and N is an integer 3 or greater, by hopping between the matrices over each of a plurality of slots, the N matrices F[i] defining the precoding process that is performed on a plurality of baseband signals when the precoding process is performed;
- and
- generate a first precoded signal z1 and a second precoded signal z2 by performing the precoding process, which corresponds to the matrix selected from among the N matrices F[i], over said each of the plurality of slots on a first baseband signal s1 included in the plurality of baseband signals and a second baseband signal s2 included in the plurality of baseband signals,
- the first precoded signal z1 and the second precoded signal z2 satisfying (z1, z2)T =F[i] (s1, s2)T,
- the N matrices F[i] being expressed as:
- F
-
- [
- i
- ]
- =
- 1
- α
- 2
- +
- 1
-
- (
- e
- j
-
-
- θ
- 11
-
- (
- i
- )
- α
- ×
- e
- j
-
-
- (
- θ
- 11
-
- (
- i
- )
- +
- λ
- )
- α
- ×
- e
- j
-
-
- θ
- 21
-
- (
- i
- )
- e
- j
-
-
- (
- θ
- 21
-
- (
- i
- )
- +
- λ
- +
- π
- )
- )
- λ representing an arbitrary angle, α representing a positive real number, θ11(i) and θ21(i) satisfying:
- ej(θ11(x)−θ21(x))≠ej(θ11(y)−θ21(y))
- wherein x and y are any integers no less than 0 and no more than N-1 satisfying x≠y,
- each of the N matrices being selected at least once in a predetermined number of slots, a result of the selecting whether to perform the precoding process, the first precoded signal z1, and the second precoded signal z2 being transmitted from a first antenna and a second antenna respectively in the same frequency at the same time.
78 more elements
Dependencies are inferred from the claim text.