Transmission method, transmission apparatus, reception method and receiver apparatus
AssigneeSun Patent Trust
InventorsYutaka Murakami, Tomohiro Kimura, Mikihiro Ouchi
Life of this patent
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Abstract
Transmission quality is improved in an environment in which direct waves dominate in a transmission method for transmitting a plurality of modulated signals from a plurality of antennas at the same time. All data symbols used in data transmission of a modulated signal are precoded by hopping 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 in the frequency domain and the time domain all differ. A modulated signal with such data symbols arranged therein is transmitted.
Claims1
A transmission method comprising:
- generating a first transmission signal and a second transmission signal from a same information;
- selecting a precoding matrix F[i] from among precoded matrices;
- precoding the first transmission signal and the second precoded transmission signal using the selected precoding matrix F[i];
- and
- transmitting the first precoded transmission signal and the second precoded transmission signal from a first antenna and a second antenna, respectively, wherein
- the precoding matrix F[i]is represented by
- F
- [
- i
- ]
- =
- 1
- α
- 2
- +
- 1
-
- (
- e
- j
-
- θ
- 1
-
- 1
- [
- i
- ]
- α
- ×
- e
- j
-
- (
- θ
- 1
-
- 1
- [
- i
- ]
- +
- λ
- )
- α
- ×
- e
- j
-
- θ
- 2
-
- 1
- [
- i
- ]
- e
- j
-
- (
- θ
- 2
-
- 1
- [
- i
- ]
- +
- λ
- +
- δ
- )
- )
- where α is a real number and smaller than 1.0,
- i is a time slot, and
- each of θ11[i] and θ21[i] is a phase changed by π/2 per one time slot and
- each of λ, and δ is a phase that is not changed.
Dependencies are inferred from the claim text.