Communication apparatus and communication system
First Claim
1. A communication apparatus, comprising:
- a reference signal generating section that generates a first reference signal to enable a communicating party to estimate a propagation environment;
a transmitting section that transmits the first reference signal;
a storing section that stores a known signal known between the apparatus and the communicating partya propagation estimating section that obtains correlation between the known signal and a second reference signal transmitted from the communicating party, and generates a delay profile as an estimation value of propagation environment;
a first data acquiring section that reads out first data associated with the delay profile generated in the propagation estimating section, from a reference table that associates the delay profile with the first data; and
a decoding section that decodes a transmission signal encoded and transmitted using an estimation value of the propagation environment estimated by the communicating party using the first reference signal, to obtain second data using the first data read out by the first data acquiring section.
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Accused Products
Abstract
A communication apparatus includes a reference signal generating section, a transmitting section, a propagation estimating section, a first data acquiring section, and a decoding section. The reference signal generating section generates a first reference signal to enable a communicating party to estimate a propagation environment. The transmitting section transmits the first reference signal. The propagation estimating section estimates a first propagation estimation value of the propagation environment using a second reference signal transmitted from the communicating party. The first data acquiring section generates first data using the first propagation estimation value. The decoding section decodes a transmission signal encoded using a second propagation estimation value that is estimated by the communicating party using the first reference signal, to obtain second data using the first data.
21 Citations
12 Claims
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1. A communication apparatus, comprising:
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a reference signal generating section that generates a first reference signal to enable a communicating party to estimate a propagation environment; a transmitting section that transmits the first reference signal; a storing section that stores a known signal known between the apparatus and the communicating party a propagation estimating section that obtains correlation between the known signal and a second reference signal transmitted from the communicating party, and generates a delay profile as an estimation value of propagation environment; a first data acquiring section that reads out first data associated with the delay profile generated in the propagation estimating section, from a reference table that associates the delay profile with the first data; and a decoding section that decodes a transmission signal encoded and transmitted using an estimation value of the propagation environment estimated by the communicating party using the first reference signal, to obtain second data using the first data read out by the first data acquiring section. - View Dependent Claims (2, 3)
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4. A communication method, comprising:
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generating, in a first communication apparatus, a first reference signal to enable a second communication apparatus to estimate a propagation environment; transmitting the first reference signal from the first communication apparatus to the second communication apparatus; storing, in the first communication apparatus, a known signal known between the first communication apparatus and the second communication apparatus; obtaining, in the first communication apparatus, correlation between the known signal and a second reference signal transmitted from the second communication apparatus, and generating, in the first communication apparatus, a delay profile as an estimation value of the propagation environment; reading out, in the first communication apparatus, first data associated with the generated delay profile, from a reference table that associates the delay profile with the first data; and decoding, in the first communication apparatus, a transmission signal encoded and transmitted using an estimation value of the propagation environment estimated by the second communication apparatus using the first reference signal, to second data using the first data read out.
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5. A transmitting apparatus, comprising:
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a plurality of antennas configured to transmit a plurality of transmitting signals simultaneously using a same frequency, the plurality of antennas including a first antenna and a second antenna; a storer configured to store a plurality of weighting coefficient sets; and a weighter configured to generate the plurality of transmitting signals, wherein; each of the transmitting signals is a non-multiplexed signal or is a multiplexed signal into which a plurality of data is multiplexed; the multiplexed signal and the non-multiplexed signal are multiplied by one weighting coefficient set, selected from the plurality of weighting coefficient sets, for each of the transmitting signals; each of the plurality of weighting coefficient sets includes a weighting coefficient for each antenna; and the plurality of weighting coefficient sets are vectors having no correlation with each other. - View Dependent Claims (6)
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7. A receiving apparatus, comprising:
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a plurality of receiving antennas configured to receive signals transmitted from a transmitting apparatus, the plurality of receiving antennas including a first receiving antenna and a second receiving antenna; and a demodulator configured to demodulate received signals received at the plurality of receiving antennas, wherein; the received signals received at the plurality of receiving antennas include a plurality of transmitted signals transmitted from a plurality of transmitting antennas of the transmitting apparatus simultaneously; each of the transmitted signals is different from each other by one weighting coefficient set selected from a plurality of weighting coefficient sets for each of the transmitted signals; each of the plurality of weighting coefficient sets includes a weighting coefficient for each transmitting antenna; the plurality of weighting coefficient sets are vectors having no correlation with each other; and the plurality of transmitted signals includes a signal multiplied by a weighting coefficient set for transmitting a multiplexed signal from each of the transmitting antennas or a signal multiplied by a weighting coefficient set for transmitting a non-multiplexed signal from each of the transmitting antennas. - View Dependent Claims (8)
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9. A transmitting method, comprising:
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transmitting a plurality of transmitting signals simultaneously using a same frequency from a plurality of antennas including a first antenna and a second antenna; storing a plurality of weighting coefficient sets; and generating the plurality of transmitting signals, wherein; each of the transmitting signals is a non-multiplexed signal or is a multiplexed signal into which a plurality of data is multiplexed; the multiplexed signal and the non-multiplexed signal are multiplied by one weighting coefficient set, selected from the plurality of weighting coefficient set for each of the transmitting signals; each of the plurality of weighting coefficient sets includes a weighting coefficient for each antenna; and the plurality of weighting coefficient sets are vectors having no correlation with each other. - View Dependent Claims (10)
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11. A receiving method, comprising:
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receiving signals transmitted from a transmitting apparatus, by a plurality of receiving antennas including a first receiving antenna and a second receiving antenna; and demodulating received signals received at the plurality of receiving antennas, wherein; the received signals received at the plurality of receiving antennas include a plurality of transmitted signals transmitted from a plurality of transmitting antennas of the transmitting apparatus simultaneously; each of the transmitted signals is different from each other by one weighting coefficient set selected from a plurality of weighting coefficient sets for each of the transmitted signals; each of the plurality of weighting coefficient sets includes a weighting coefficient for each transmitting antenna; the plurality of weighting coefficient sets are vectors having no correlation with each other; and the plurality of transmitted signals includes a signal multiplied by a weighting coefficient set for transmitting a multiplexed signal from each of the transmitting antennas or a signal multiplied by a weighting coefficient set for transmitting a non-multiplexed signal from each of the transmitting antennas. - View Dependent Claims (12)
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Specification