WO2004028031A1 - 送信装置、受信装置、無線通信方法及び無線通信システム - Google Patents
送信装置、受信装置、無線通信方法及び無線通信システム Download PDFInfo
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- WO2004028031A1 WO2004028031A1 PCT/JP2003/011688 JP0311688W WO2004028031A1 WO 2004028031 A1 WO2004028031 A1 WO 2004028031A1 JP 0311688 W JP0311688 W JP 0311688W WO 2004028031 A1 WO2004028031 A1 WO 2004028031A1
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- 238000004891 communication Methods 0.000 title claims abstract description 85
- 238000000034 method Methods 0.000 title claims abstract description 81
- 230000005540 biological transmission Effects 0.000 claims abstract description 398
- 239000013598 vector Substances 0.000 claims description 71
- 230000007480 spreading Effects 0.000 claims description 34
- 238000013507 mapping Methods 0.000 claims description 22
- 238000012545 processing Methods 0.000 claims description 16
- 239000000969 carrier Substances 0.000 claims description 11
- 230000010287 polarization Effects 0.000 claims description 10
- 238000000926 separation method Methods 0.000 claims description 10
- 230000000717 retained effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 39
- 238000001228 spectrum Methods 0.000 description 39
- 238000006243 chemical reaction Methods 0.000 description 31
- 239000011159 matrix material Substances 0.000 description 16
- 238000010295 mobile communication Methods 0.000 description 15
- 230000008569 process Effects 0.000 description 14
- 238000001514 detection method Methods 0.000 description 13
- 230000008859 change Effects 0.000 description 9
- 238000001914 filtration Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 3
- 230000003044 adaptive effect Effects 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000005562 fading Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 230000001413 cellular effect Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
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- 230000013011 mating Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
- H04L25/0204—Channel estimation of multiple channels
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
- H04K1/00—Secret communication
- H04K1/02—Secret communication by adding a second signal to make the desired signal unintelligible
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
- H04L9/08—Key distribution or management, e.g. generation, sharing or updating, of cryptographic keys or passwords
- H04L9/0816—Key establishment, i.e. cryptographic processes or cryptographic protocols whereby a shared secret becomes available to two or more parties, for subsequent use
- H04L9/0819—Key transport or distribution, i.e. key establishment techniques where one party creates or otherwise obtains a secret value, and securely transfers it to the other(s)
Definitions
- the present invention relates to a transmitting device, a receiving device, a wireless communication method, and a wireless communication system.
- the present invention relates to a transmitting device, a receiving device, a wireless communication system, and a wireless communication method for transmitting confidential information between specific wireless stations.
- the secret information was encrypted so that even if the transmission data was intercepted by a third party, the contents of the secret information could not be understood by the third party.
- Cryptography has been studied in various fields and applied in various fields. This is because encryption has the advantage that a certain level of security can be secured without changing the wireless communication system.
- information encryption has the problem that information can be decrypted relatively easily if the code for encryption and the encryption procedure are known.
- security cannot be ensured unless fairly complicated encryption processing is performed.
- FIG. 23 shows a conventional wireless communication system described in the above publication.
- the transmission station 2 3 10 is shared by the propagation environment estimator 2 3 1 1 only with the reception station 2 3 2 0 to which transmission data including confidential information is to be transmitted. 30 environment is estimated, and a transmission data including confidential information is transmitted in consideration of the radio channel environment. As a result, confidential information cannot be received or restored by another wireless station having a different wireless propagation path environment, so that confidential information can be transmitted with high security.
- the propagation parameters that characterize the propagation path and the directivity and polarization of the antenna usually have frequency characteristics. Therefore, in a wireless communication method in which a transmitting station controls a propagation parameter using a plurality of antennas as in the configuration of the above-mentioned patent publication, the frequency characteristics within a specific frequency band, ie, the antenna and the propagation path are uniform It is assumed that the propagation parameters are controlled within a range that can be considered.
- the present invention has been made in view of the above circumstances, and has a high security transmission in which a propagation parameter having a frequency characteristic or an antenna characteristic itself can be information for specifying a transmission signal in a wideband wireless communication. It is an object to provide a device, a receiving device, a wireless communication method, and a wireless communication system.
- a transmitting apparatus includes an array antenna composed of M (M is an integer of 2 or more) antenna elements for receiving a carrier modulation signal of a known symbol transmitted from a radio station.
- M is an integer of 2 or more
- a reference symbol generating means for generating a reference symbol for providing a phase reference, the transmitting antenna and the array antenna based on the reference symbol from the baseband signal received by the antenna element.
- a propagation channel estimating means for generating M reception symbols, which are estimated values of the complex propagation channel between them.
- the carrier modulation signal of the transmitting apparatus is composed of a multi-carrier, and a carrier separating means for separating the reception baseband signal received by the M antenna elements into N (N is an integer of 2 or more) subcarriers. Further, after the baseband signal received by the carrier separation means is separated into N (N is an integer of 2 or more) subcarriers, MXN reception values, which are estimated values of a complex propagation channel, are obtained based on the reference symbol. It is characterized by generating a symbol.
- the received signal for each subcarrier that forms a multicarrier shares the propagation channel characteristics that are shared only with the wireless station that is the target of transmission of transmission data containing confidential information. Since it is possible to characterize with the channel estimation value obtained from, the data of the maximum number of subcarriers can be transmitted in parallel at the same time, and confidential information can be transmitted in a short time with high security.
- the propagation channel estimating means of the transmitting apparatus comprises: M antenna elements After despreading and demultiplexing the baseband signal received at (2) using N (M is an integer of 2 or more) spreading codes, MXN received symbols, which are estimates of complex propagation channels based on the reference symbol Generate
- a propagation channel characteristic shared only with a radio station to which transmission data including confidential information is transmitted can be obtained from a received signal for each spread coding. Since it is possible to characterize with the channel estimation value, data of the maximum number of spreading codes can be transmitted in parallel at the same time, and confidential information can be transmitted in a short time with high security.
- the M antenna elements constituting the array antenna of the transmitting apparatus have different directivity patterns or different polarizations.
- the propagation channel characteristic shared only with the radio station to be transmitted changes depending on the directivity pattern of the antenna element forming the array antenna.
- it is necessary to consider the propagation channel characteristics including the directivity pattern of the antenna which makes it more difficult to restore confidential information by a third party, and as a result, transmits confidential information with high security can do.
- changing the polarization as compared with changing the directivity pattern with the same number of antenna elements makes it possible to reduce the size of the array antenna, and consequently the size of the entire device.
- the transmission apparatus calculates a plurality of sets of transmission symbol vectors each including M transmission symbols from M reception symbols, and generates a reference including a plurality of sets of transmission symbol vectors.
- Transmission symbol calculation means for generating a table; symbol selection means for selecting a set of transmission symbol vectors from a reference table based on transmission data to generate M transmission symbols;
- a single carrier modulating means for generating a spanned signal.
- the transmitting apparatus calculates a plurality of sets of transmission symbol vectors each including N subcarrier components, the plurality of sets of transmission symbol vectors being M for each of N subcarrier components, and Transmission symbol calculating means for generating a reference table composed of N transmission symbol vectors, and a set of transmission symbol vectors from N reference tables corresponding to N subcarriers based on the transmission data.
- a symbol mapping means for selecting a vector and generating MXN transmission symbols, and a single carrier modulation means for generating a transmission baseband signal from the MXN transmission symbols using N subcarrier components. Have.
- the propagation channel characteristic shared only with the radio station to which the transmission data including the confidential information is transmitted can be obtained from the reception signals of the plurality of subcarrier components constituting the multicarrier in the plurality of antennas Since it is possible to characterize with channel estimation values and transmit transmission data including confidential information based on the correlation of channel estimation values between antennas, etc., confidential information is received by other wireless stations with different radio propagation environments Or cannot be restored. As a result, confidential information can be transmitted with higher security in a mobile communication system in which the relative positional relationship between the transmitting and receiving devices is constantly changing and the frequency characteristics of the propagation channel are constantly changing accordingly.
- the transmitting apparatus calculates a plurality of sets of transmission symbol vectors each including M transmission symbols for every N spreading codes from the MXN reception symbols, and Transmission symbol calculation means for generating a reference table composed of symbol vectors, and a set of transmissions from N reference tables corresponding to N spreading codes based on transmission data including confidential information.
- Symbol mapping means for selecting a symbol vector to generate MXN transmission symbols, and a single carrier for generating a transmission baseband signal from the MXN transmission symbols by spreading using N despreading codes. Modulating means.
- the propagation channel characteristic shared only with the wireless station that is the target of transmission of the transmission data including the confidential information is obtained by the channel estimation value for each of the plurality of spreading codes obtained from the reception signals of the plurality of antennas It is possible to characterize and transmit transmission data including confidential information based on the correlation of channel estimation values between antennas, etc., so that other radio stations with different radio propagation environments cannot receive or recover confidential information .
- the characteristics of mobile communication systems in which the relative positional relationship between the transmitting and receiving devices constantly changes and the characteristics of the propagation channel constantly change accordingly. Since the randomness of propagation parameters can be used, higher security can be ensured.
- the transmission symbol calculation means generates a plurality of sets of symbol vectors for controlling any one of the reception power and the phase in the radio station.
- phase rotation of a received signal caused by movement of a radio station is almost 360 degrees at a wavelength interval of a carrier wave.
- a third party cannot restore transmission data including confidential information based on phase information.
- confidential information can be transmitted with higher security as compared with the case where the symbol is determined based on the received power.
- a receiving apparatus includes a propagation parameter-evening estimation unit for estimating a propagation parameter from a received signal, and a symbol determination unit for restoring transmission data based on the propagation parameter.
- reception signal of the receiving apparatus according to the present invention is composed of multicarrier, T thin 03/011688
- a carrier separating unit for separating the signal into a plurality of subcarriers; a propagation parameter estimation unit for estimating a propagation parameter for each subcarrier; and a symbol determination unit for transmitting data from the received signal for each subcarrier.
- the receiving device is any one of an OFDM signal configured so that subcarriers are orthogonal to each other in a frequency space and a CDMA signal configured to be orthogonal to each other in a code space.
- the receiving apparatus according to the present invention has an array antenna created with at least one or more antenna elements, and the propagation parameter estimating means estimates the propagation parameter for each antenna.
- the receiving apparatus of the present invention performs a quadrature detection of the received baseband signal to thereby provide a propagation parameter estimation means for generating a reception symbol which is a complex symbol, based on a determination criterion predetermined from the reception symbol. It has a symbol determination means for restoring the transmission data.
- the wireless station transmits the transmission data including the confidential information based on the correlation between the channel estimation values between the antennas, which is a predetermined determination criterion, so that the radio station can determine the symbol of the received signal. Since it is possible to do so, confidential information cannot be received or restored by other wireless stations with different wireless propagation environments.
- the baseband signal of the receiving apparatus of the present invention is composed of a multicarrier, and further includes a carrier separating means for separating the baseband signal into N (N is an integer of 2 or more) subcarrier components, After the means is separated into subcarriers, the propagation parameter estimation means generates received symbols for each subcarrier. According to this configuration, the channel between antennas, which is a predetermined criterion, is used.
- the radio station By transmitting transmission data containing confidential information based on the correlation of the estimated values of the signals, it is possible for the radio station to make a symbol decision on the received signal, so that it can be used in other radio stations with different radio propagation environments. Cannot receive or restore confidential information. As a result, the confidential information can be transmitted with higher security due to the characteristics of the mobile communication system in which the relative positional relationship between the transmitting and receiving apparatuses is constantly changing and the frequency characteristic of the propagation channel is constantly changing accordingly. ⁇
- the symbol determination means of the receiving apparatus of the present invention despreads the baseband signal using N (N is an integer of 2 or more) spreading codes, and then determines transmission data based on a predetermined determination criterion. Restore.
- the wireless station transmits the transmission data including the confidential information based on the correlation between the channel estimation values between the antennas, which is a predetermined determination criterion, so that the radio station can determine the symbol of the received signal. Since it is possible to do so, confidential information cannot be received or restored by other wireless stations with different wireless propagation environments. As a result, due to the characteristics of the mobile communication system in which the relative positional relationship between the transmitting and receiving devices is constantly changing and the characteristics of the propagation channel are always changing accordingly, in addition to the confidentiality obtained by using the spreading code, the propagation Since the randomness of parameters can be used, higher security can be ensured.
- the symbol determination means of the receiving apparatus of the present invention determines a symbol based on the reception power of the antenna.
- a wireless communication method is a wireless communication method for transmitting transmission data from a first wireless station to a second wireless station using a single carrier, wherein both the second wireless station and the first wireless station transmit data. Transmitting known information and a propagation parameter, which is a parameter of a propagation channel shared only between the first radio station and the second radio station, to the second radio station that has received the known information. Estimating from the information transmitted from the 8
- the method includes a step of calculating a plurality of propagation parameters and a step of restoring transmission data based on the plurality of propagation parameters calculated by the second wireless station.
- the propagation channel has different characteristics at different observation points, and the propagation parameters that make up the propagation channel are different from those of the first and second radio stations.
- by specifying transmission data using multiple propagation parameters obtained from the reception signals of multiple antennas it is possible to use the reception signal of a specific antenna as a criterion for determining the propagation parameters. As a result, higher security can be secured.
- the wireless communication method is a wireless communication method for transmitting transmission data from a first wireless station to a second wireless station by multicarrier, wherein the second wireless station transmits the data to the first wireless station.
- the second wireless station restores transmission data based on propagation parameters estimated from a received signal for each carrier constituting the multicarrier.
- the radio communication method according to the present invention is an OFDM signal in which carriers constituting a multicarrier are orthogonal to each other in a frequency space or a CDMA signal configured to be orthogonal to each other in a code space. .
- the wireless communication method is a wireless communication system for transmitting transmission data from a first wireless station to a second wireless station by a single carrier modulation scheme,
- a propagation channel estimating means for estimating a parameter of a propagation channel shared only between the first wireless station and the second wireless station; and
- a first radio station having transmission means for transmitting transmission data from the first radio station to the second radio station by superimposing a transmission signal on a channel parameter, and a plurality of radio signals obtained from reception signals of a plurality of antennas.
- a transmission parameter estimating means for calculating the propagation parameters of the first radio station and a symbol determination means for restoring the transmission data from the first radio station based on the calculated plural propagation parameters.
- Radio stations Have.
- a transmission device, a reception device, a wireless communication system, and a wireless communication method capable of transmitting confidential information with high security when performing wireless communication over a wide band between specific wireless stations can be realized.
- FIG. 1A is a diagram showing a configuration of a general mobile communication system.
- FIGS. 1B and 1C are diagrams showing frequency spectra forming a propagation channel between a transmitting antenna and a receiving antenna. 2003/011688
- FIG. 2A is a block diagram showing a configuration of the wireless communication system according to Embodiment 1 of the present invention.
- FIGS. 2B and 2C are diagrams showing a frequency spectrum forming a propagation channel between a transmitting antenna and a receiving antenna.
- FIG. 3 is a block diagram showing a configuration of the transmitting station according to Embodiment 1 of the present invention.
- FIG. 4 is a block diagram showing a configuration of the receiving station according to Embodiment 1 of the present invention.
- FIG. 5 is a block diagram showing a configuration of a symbol matching section of the transmitting station according to Embodiment 1 of the present invention.
- FIG. 6A is a block diagram showing a configuration of a wireless communication system according to Embodiment 2 of the present invention.
- FIGS. 6B and 6C are diagrams showing frequency spectra forming a propagation channel between the transmitting antenna and the receiving antenna.
- FIG. 7 is a block diagram showing a configuration of a receiving station according to Embodiment 2 of the present invention.
- FIG. 8A is a block diagram showing a configuration of a wireless communication system according to Embodiment 3 of the present invention.
- FIG. 8B is a diagram showing eight subcarrier components forming a multicarrier.
- FIGS. 8C and 8D are diagrams showing frequency spectra forming a propagation channel between a transmitting antenna and a receiving antenna.
- FIG. 9 is a block diagram showing a configuration of a transmitting station according to Embodiment 3 of the present invention.
- FIG. 10 is a block diagram showing a configuration of a receiving station according to Embodiment 3 of the present invention.
- FIG. 11 is a block diagram showing a configuration of a symbol mapping unit of a transmitting station according to Embodiment 3 of the present invention.
- FIG. 12A is a block diagram showing a configuration of a wireless communication system according to Embodiment 4 of the present invention.
- FIGS. 12B and 12C are diagrams showing frequency spectra constituting a propagation channel between the transmitting antenna and the receiving antenna.
- FIG. 13 is a block diagram showing a configuration of a receiving station according to Embodiment 4 of the present invention.
- FIG. 14 is a diagram illustrating a symbol determination method according to the third embodiment.
- FIG. 15 is a diagram illustrating a symbol determination method according to the fourth embodiment.
- FIG. 16 is a block diagram showing a configuration of a transmitting station according to Embodiment 2 of the present invention.
- FIG. 17 is a block diagram showing a configuration of a receiving station according to Embodiment 4 of the present invention.
- FIGS. 18A and 18B are block diagrams showing a reference table of the transmitting station according to Embodiment 1 of the present invention.
- FIG. 19 is a diagram showing a reference table of the transmitting station according to Embodiment 2 of the present invention.
- FIGS. 20A, 20B, and 20C are diagrams showing a method for allocating transmission time of a known symbol according to Embodiment 2 of the present invention.
- FIG. 21 is a block diagram showing a configuration of a transmitting station according to Embodiment 5 of the present invention.
- FIG. 22 is a block diagram showing a configuration of a receiving station according to Embodiment 5 of the present invention.
- FIG. 23 is a block diagram showing a configuration of a conventional wireless communication system. BEST MODE FOR CARRYING OUT THE INVENTION
- FIG. 1A is a conceptual diagram showing a general mobile communication system 100
- FIGS. 1B and 1C show propagation parameters constituting a propagation channel between one transmitting antenna and two receiving antennas.
- An example of a frequency spectrum is shown as an example.
- a mobile communication system 100 has a transmitting antenna 101, a receiving antenna 102a and a 102b, and a transmitting antenna 101 and a receiving antenna 102a.
- Propagation channel 103a, transmission antenna 101 and reception antenna 102b constitute transmission channel 103b.
- FIG. 1B shows a frequency spectrum 104a of the received signal observed at the receiving antenna 102a
- FIG. 1C shows a frequency spectrum 1 of the received signal observed at the receiving antenna 102b. 0 4b is shown.
- the relative position between transmission and reception changes with the movement of the terminal and surrounding objects, and the propagation channel 100 Since 3a and 103b fluctuate, the frequency spectrum, 104a and 104b also fluctuate.
- the arriving wave and its amplitude and position between the two receiving antennas depend on the antenna parameters and the propagation parameters. The differences are different. Therefore, the propagation channel 103a and the propagation channel 103b differ, and as a result, the frequency spectrums 104a and 104b also exhibit different characteristics.
- the propagation parameters include the complex channel coefficient represented by the amplitude and phase of a received signal with respect to a reference signal such as a transmission signal and a local oscillation signal, and a transmission antenna that depends on a radio wave space propagation mechanism. It is defined as including the radiation direction, propagation time and propagation distance, the incident direction to the receiving antenna, the attenuation coefficient of the power due to propagation, and the polarization indicating the electric field direction.
- the antenna parameters include all design parameters related to general antenna design, such as directional pattern polarization and matching impedance. In addition, when it can be considered that there is no change in the propagation channel with time at the same frequency, the propagation path maintains reciprocity in transmission and reception.
- FIG. 2A shows a wireless communication system according to Embodiment 1 of the present invention.
- a wireless communication system 200 has a transmitting station 201 and a receiving station 202 and performs single-carrier wireless communication using a specific frequency band.
- the transmitting station 201 simply refers to a side that transmits transmission data including confidential information, and the side that receives the confidential information is called a receiving station 202, and each of them performs both transmitting and receiving functions.
- a receiving station 202 the side that receives the confidential information is called a receiving station 202, and each of them performs both transmitting and receiving functions.
- the transmitting station 201 has transmitting station antennas 203a and 203b, and the receiving station 202 has a receiving station antenna 204a.
- FIG. 2B shows a single carrier electric spectrum 206 a of a propagation channel 205 a between the transmitting station antenna 203 a and the receiving station antenna 204 a
- FIG. 9 shows a single carrier power spectrum 206 b of a propagation channel 205 b between 0 3 b and a receiving station antenna 204 a.
- the power spectrums 206a and 206b have different characteristics, and the frequency spectrum estimated by another wireless station having a different propagation path also has different characteristics.
- FIG. 3 a specific configuration of the transmitting station 201 is shown in FIG. 3, and a specific configuration of the receiving station 202 is shown in FIG.
- the known symbol generation means 400 generates a known symbol 410 shared between the transmitting station 201 and the receiving station 202, and has a single carrier conversion.
- the modulation means 402 modulates the known symbol 4101 into a transmission baseband signal 403, and the frequency conversion means 404 transmits the transmission baseband signal 403 to the transmission RF signal 4. It converts the RF signal received from the antenna 204a into the baseband signal 408a.
- the propagation parameter estimating means 409 generates a received symbol 411a which is a complex symbol by orthogonal detection from the received baseband signal 408a, and the symbol determination means 411 Is to perform a symbol determination process on the reception symbol 410a based on a predetermined determination criterion.
- the antenna 204a transmits and transmits the RF signal 405 as a single carrier modulated signal 406a.
- transmitting station antennas 203 a and 203 b receive and transmit RF signals. Further, the frequency conversion means 301 converts the received RF signals 300a and 300b into the received baseband signals 302a and 302b, respectively, or transmits the baseband signals 300b and 302b. 17a and 317b are converted into RF signals 318a and 318b for transmission.
- the reference symbol generating means 303 is the same symbol as the known symbol 401, and generates a reference symbol 304 that gives the phase reference of the received baseband signals 302a and 302b.
- Propagation channel estimating means 300 receives reception baseband signals 302 a and 302 b and receives receiving station antenna 204 a and transmitting station antenna 203 based on reference symbol 304.
- the transmission symbol calculation means 310 receives the reception symbols 303 and 307, and sets a plurality of sets of two transmission symbols for the transmitting station antennas 203a and 203b. Is calculated, and a reference table 309 composed of a plurality of sets of the transmission symbol vectors is generated.
- a method of generating the transmission symbol vector and the reference table 309 will be described in detail below.
- reception symbol 306 and the reception symbol 307 are defined as h1 and h2, respectively, and a channel matrix h representing the propagation channel characteristic between the transmitting station antennas 203a and 203b and the receiving station antenna 204a is expressed by (Equation 1). Is defined as
- any matrix can be represented as the product of three new matrices by singular value decomposition.
- Equation 2 if h is considered as a 1-by-2 matrix, U can be considered as a 1-by-1 matrix. In this case, it is 1.
- ⁇ is a 1-by-2 matrix, and is a 2-by-2 matrix in which the column vectors V 1 and V 2 of V are singular vectors of h. These can be expressed as (Equation 3).
- V 1 and V 2 are both 2-by-1 vectors.
- the transmitting station 201 transmits v l or V 2 to the receiving station 202 from the transmitting station antennas 203a and 203b as a transmission symbol for selecting or multiplexing the transmission data according to transmission data.
- the received signal in this case is expressed as (Equation 4).
- the power of the received symbols 410 a is equal to almost I s I 2.
- y is the received symbol 410a
- n is a noise component mainly due to thermal noise of the receiver
- C1 is a symbol selection vector applied to V to select a transmission symbol vector in this process.
- y h- (V-Cl) + n s + n CI (4)
- the transmit symbol vector VC is calculated using the symbol selection vector C (C1 or CO), and the transmit symbol vector VC is calculated as the transmit symbol of the transmitting station antennas 203a and 203b.
- the transmit symbol vector VC is calculated as the transmit symbol of the transmitting station antennas 203a and 203b.
- the transmitting station 201 selects V ⁇ C 1 when the transmission information is 1, and V ⁇ C 1 when the transmission information is 0.
- the receiving station can determine the bit based on the power of the reception symbol 410 a. Therefore, the lookup table 308 generated by the transmission symbol calculation means 308 has a configuration as shown in FIG. 18A.
- V 1 and V 2 are three-dimensional vectors
- the lookup table 308 is As shown in Fig. 18B, the number of combinations of symbol selection vectors C increases as the number of antennas increases.
- the transmitting symbol calculating means 308 is provided with a plurality of transmitting station antennas 203 a and a plurality of transmitting station antennas 203 b for controlling the power of the receiving symbol 410 a in the receiving station 202.
- a complex symbol of a set is calculated and generated as a reference table 309 of the transmission symbol vector.
- the symbol mapping unit 31 starting from the transmission data 310, sets a combination of the transmission symbol 3 14 and the transmission symbol 3 15 such that the power of the reception symbol 4 10a is above or below a specific threshold. It is to be calculated.
- a specific threshold a specific threshold
- FIG. 5 is a block diagram showing the configuration of the symbol mapping unit 311.
- the symbol mapping unit 311 which receives the transmission data 310 as an input includes a table storage means 3 1 2 for storing a reference table 3 09 and a symbol selection unit. Means 3 13.
- the symbol selection means 3 13 refers to the table storage means 3 12 based on the transmission data 3 10, and transmits the transmission symbol 3 14 corresponding to the transmission station antenna 2 3 a and the transmission station antenna 2 0 3 This selects the transmission symbol 3 15 corresponding to b.
- the single-carrier modulating means 3 16 receives the transmission symbol 3 14 as an input to generate a transmission baseband signal 3 17 a, and receives the transmission symbol 3 15 as an input and transmits a transmission baseband signal 3 1 7b.
- a wireless communication method performed between the transmitting station 311 and the receiving station 202 configured as described above will be described below.
- the known symbol 410 generated by the known symbol generating means 400 of the receiving station 202 is converted into the baseband signal 4003 transmitted by the single carrier modulating means 402. Modulated to
- the modulated transmission baseband signal 403 is converted to a transmission RF signal 405 by frequency conversion means 404 and transmitted as a single carrier modulation signal 406 a from antenna 204 a. Is done.
- the single carrier modulated signal 400 a of the known symbol 401 transmitted from the receiving station 202 is simultaneously received by the antennas 203 a and 203 b, and the frequency conversion means 30 0 1 converts them to the received baseband signals 302a and 302b, respectively.
- the baseband signals 302a and 302b are processed by the propagation channel estimator 300 based on the reference symbol 304 generated by the reference symbol generator 303.
- Received symbols 300 and 307 which are estimated values of a complex propagation channel between the receiving station antenna 204a and the transmitting station antennas 203a and 203b, respectively, are generated.
- reception symbols 303 and 307 are processed by the transmission symbol calculation means 310 to calculate the transmission symbol vectors for the transmission station antennas 203a and 203b. Then, a reference table 309 composed of the plurality of sets of transmission symbol vectors is generated.
- the propagation parameters between the transmitting station 201 and the receiving station 202 are calculated in advance using known symbols, and are stored in the transmitting station 201 as a reference table. Keep it.
- the transmission data 310 is used by the symbol mapping section 311 to use this reference table to determine the power change of the reception symbol 410a at the receiving station 202, and the data of the transmission data 310 It is calculated as a combination of the transmission symbol 3 14 and the transmission symbol 3 15 which are the same as the column.
- the transmission symbols 314, 315 are processed in the single carrier modulation means 316 to generate transmission baseband signals 317a, 317b.
- the baseband signals 317 a and 317 b for transmission are simultaneously converted into RF signals 318 a and 318 b for transmission by the frequency conversion means 301, and then transmitted from the receiving station 202 by the transmitting station antennas 203 a and 203 b. Sent to.
- the RF signals 318a and 318b transmitted from the transmitting station 201 are combined and received by the receiving station antenna 204a, and are converted into the received baseband signal 408a by the frequency converting means 404.
- the baseband signal 408a is processed by the propagation parameter estimation unit 409, and a reception symbol 410a is generated by orthogonal detection.
- the reception symbol 410a is determined by the symbol determination unit 411 based on a predetermined power threshold, and the reception data 412 is obtained.
- transmission data 310 including confidential information transmitted from transmitting station 201 is restored.
- the transmission data 310 is a 2-bit data sequence 10001 101, and this data transmission sequence is transmitted in time series to transmit information of 8 bits.
- the symbol mapping unit 31 1 of the transmitting station 201 for example, when the transmission data 3 10 is 1, the symbol selecting unit 313 performs transmission such that the power of the receiving symbol 410 a in the receiving station 202 is equal to or higher than a specific threshold.
- a combination of the symbol 314 and the transmission symbol 315 is selected from the table storage unit 312.
- the transmission data 310 is 0, a combination of the transmission symbol 314 and the transmission symbol 315 such that the power of the reception symbol 410a is equal to or less than a specific threshold is stored in the table storage means.
- the selected transmission symbol is modulated and transmitted from antennas 203a and 203b.
- the symbol determination means 411 determines that the power of the reception symbol 410a is equal to or higher than a specific threshold as 1 and that the power of the reception symbol 410a is equal to or lower than the threshold as 0. And demodulate. Then, if the result of chronologically determining the power of the reception symbol 4100a corresponding to 100001101 of the transmission data sequence matches 100001111, the data is determined. It is transmitted correctly.
- varying the amplitude and phase of the transmission symbol 3 14 and the transmission symbol 3 15 which are complex symbols is performed by the combined directional pattern formed by the transmitting station antenna 203 a and the transmitting station antenna 203 b. Will be changed.
- the signal power of the reception symbol 410a received by the reception station antenna 204 also changes.
- the power spectrums 206a and 206b depend on the propagation space formed between the transmitting station and the receiving station, and are considered to characterize the positional relationship between the transmitting and receiving stations. For this reason, even if the transmission signal is from the same transmission station 201, it will be observed in a different frequency spectrum at another reception station other than the reception station 202.
- a third party demodulates transmission data 310 including confidential information by another receiving station. Or, it is difficult to restore, and as a result, confidential information can be transmitted with high security.
- the modulation method in which the symbol information of the transmission data is superimposed on the power (amplitude) of a single carrier as the propagation parameter has been described. However, it is also possible to superimpose the symbol information on the phase.
- the transmission symbol 3 14 corresponding to the transmission station antenna 2 0 3 a and the transmission symbol 3 15 corresponding to the transmission station antenna 203 b are each a complex symbol.
- a configuration may be adopted in which a transmission symbol for controlling the phase of the reception symbol 410a in the reception station 202 is generated.
- the propagation parameter overnight estimating means 409 estimates the reception symbol 410a as a complex symbol. For this reason, when the phase is used as the criterion in the symbol determination means 411, for example, the reception symbol 4110 a is divided into the right half and the left half of the complex plane on which the reception symbol 410 a is mapped, and The symbol can be determined by which area is located.
- the imaginary axis on the complex plane as the boundary for phase determination in advance, for example, when the reception symbol 4 10a is in the right half on the complex plane, it is determined to be 1 and when it is in the left half, it is set to 0. This makes it possible to make a symbol determination.
- a method of determining a single carrier to be used as a criterion for symbol determination in advance is that the transmitting station 201 transmits transmission symbol information as amplitude or phase information of a received signal at the antenna of the receiving station 202.
- Receiving station 202 is a symbol judgment criterion
- the transmission information can be demodulated by calculating a difference value between the amplitude or phase of a single carrier and the amplitude or phase of another single carrier, and performing a bit determination process using the result, for example.
- the method of configuring a multi-carrier subset consisting of several single carriers is based on the fact that the transmitting station 201 sets the transmission symbol information as a relative amplitude between the single carriers constituting a predetermined multi-carrier subset. Alternatively, it is transmitted to receiving station 202 as phase information. The receiving station 202 calculates the difference value of the amplitude or phase between the single carriers constituting each multi-carrier subset and demodulates the transmission information by using the result, for example, by performing a bit determination process. It is possible to do.
- the propagation channel 205a obtained in advance is
- the transmission symbol reference table 309 can be generated using the estimated value of 205 b, the propagation channel estimating means 305 shown in FIG. 3 is not required, and the configuration of the transmitting station 201 is simplified. Can be
- the combination of a plurality of antennas can be used by setting the number of antennas of the transmitting station 201 to three or more, the transmission data including secret information by a third party by another receiving station can be used. Demodulation or restoration is more difficult, and the transmitting station antenna 2
- the transmitting station As a method for the transmitting station to obtain the downlink channel state information, in the case of TDD, which uses the same frequency carrier for the uplink and the downlink of the wireless link, the uplink from the receiving station is used due to the reciprocity of the channel.
- Channel at the transmitting station using State information can be estimated or measured, and Embodiment 1 of the present invention is similar to this.
- the receiving station estimates or measures downlink channel state information, and notifies the transmitting station of the result. Since accurate channel state information of the downlink can be obtained, the applicable range of the present invention is not limited to a wireless communication system employing TDD.
- FIG.6A shows a wireless communication system 600 according to Embodiment 2 of the present invention, in which a receiving station 6001 has a receiving station antenna 204b in addition to a receiving station antenna 204a. Except for this, the configuration is almost the same as that of the wireless communication system 200 of the first embodiment.
- Fig. 6B shows the single carrier electric spectrum 206c of the propagation channel 205c between the transmitting station antenna 203a and the receiving station antenna 204b
- Fig. 6C shows the transmitting station antenna 2c.
- Fig. 7 shows a sinusoidal carrier power spectrum 206d of a propagation channel 205d between the antenna 3b and the receiving station antenna 204b.
- FIG. 7 is a block diagram showing a specific configuration of the receiving station 600.
- a known symbol generator 400 generates a known symbol 410 and also generates a reference clock signal 700 that determines the timing of a time slot.
- the frequency converting means 404 switches between the receiving station antenna 204a and the receiving station antenna 204b in synchronization with the time slot Tl, ⁇ 2.
- the transmitting RF signal is transmitted from the receiving station antenna 204a as the sinusoidal carrier modulated signal 406a, and the same transmitting RF signal is transmitted in the receiving slot in the time slot T2.
- a single-carrier modulated signal is 40 b from antenna 204 b To send.
- FIG. 16 is a block diagram illustrating a configuration of the transmitting station 201 according to the present embodiment.
- the transmitting station 201 generates the reference clock signal 701, which determines the timing of the time slots T1 and T2, by the reference symbol generation means 3003, and generates two types of reference symbols at each timing. And that the propagation channel estimating means 305 generates the received symbol from the spanned signal at each timing.
- a wireless communication method performed between the transmitting station 201 and the receiving station 600 configured as described above will be described below.
- the known symbol 410 generated by the known symbol generation means 400 of the receiving station 01 is modulated by the single carrier modulation means 402 into a baseband signal 403 for transmission.
- the modulated transmission baseband signal 403 is the same as the reference clock signal 700 generated by the known symbol generation means 400, and is transmitted by the frequency conversion means 404. Converted to 0 7a, 4 07 b. Then, the symmetric carrier modulated signals 406a and 406b are separately transmitted from the antennas 204a and 204b, respectively, using different time slots T1 and T2.
- the single-carrier modulated signal 406a transmitted from the receiving station antenna 204a and the single-carrier modulated signal 406b transmitted from the receiving station antenna 204b are transmitted to the transmitting station 201. Received by transmitting station antennas 203a and 203b.
- the frequency conversion means 301 receives the single-carrier modulated signal 400a and the single-carrier modulated signal 400b from the received RF signals 300a and 300b.
- the signal is separated.
- the received baseband signal 302a corresponding to the transmitting station antennas 203a and 203b for each time slot is obtained.
- 302b is generated and output to the propagation channel estimation means 300.
- these spanned signals 302a and 302b are obtained by the propagation channel estimating means 300 in time slot T1 based on the reference symbol 304 from the reference symbol generating means 303.
- the reception symbol 306a which is an estimated value of the complex propagation channel between the reception station antenna 204a and the transmission station antenna 203a, the reception station antenna 204a and the transmission station antenna 2 Received symbols 3 07 a that are estimated values of the complex propagation channel between 0 3 b are generated.
- Receive symbol 30 b which is an estimated value of the complex propagation channel between a
- received symbol 3 07 b which is an estimated value of the complex propagation channel between the receiving station antenna 204 b and the transmitting station antenna 203 b Are generated.
- reception symbols 304 a and 307 a estimated from the reception signal of the reception station antenna 204 a, and the reception symbol 300 s estimated from the reception signal of the reception station antenna 204 b b and 307b are processed by the transmission symbol calculation means 308, and, as in the first embodiment, two transmission symbols for the transmission station antenna 203a and the transmission station antenna 203b are combined. Multiple sets of transmission symbol vectors are calculated. Then, a reference table 309 composed of the plurality of sets of transmission symbol vectors is generated.
- MM SE Min imum Me an Square E rror
- BB Goode "Adaptive Antenna Systems", Proc. IEEE, vol.55, no.12, pp. 2143-2158, Dec. 1967 ⁇ ]
- Zero-forcing method JG Proakis, Digital Communications, 3rd Edition, McGraw-Hill, New York, 1995.
- the weighting coefficient for the transmitting station antennas 203a and 203b is calculated by regarding the receiving station antenna 204b as an interference signal source. Then, by using the weighting coefficient directly as a transmission symbol, the receiving station 601 can perform control to maximize the power of the received signal at the receiving station antenna 204a.
- the weighting coefficient for the transmitting station antennas 203a and 203b is calculated by considering the receiving station antenna 204a as an interference signal source. Then, by using the weighting coefficient directly as a transmission symbol, the receiving station 600 can perform control to minimize the power of the received signal at the receiving station antenna 204b.
- reception symbol 306a and the reception symbol 307a are h11 and h12, respectively
- the reception symbol 306b and the reception symbol 307b are h21 and h22, respectively
- the transmission station antennas 203a and 203b are reception.
- Station antenna 204 Define the channel matrix H that represents the propagation channel characteristics during a as in (Equation 6), hll hl2
- H + is a matrix of 2 rows and 2 columns
- J is a unit matrix in which diagonal elements are S1 and S2 and all others are zero.
- y1 is the reception symbol 410a
- y2 is the reception symbol 410a
- n is the noise component vector mainly due to the thermal noise of the receiver
- C10 is for selecting the transmission symbol vector in this process.
- the received signal when only w2 is transmitted is expressed by a mathematical formula, it is expressed as (Equation 10)
- the power of the receiving symbol 410 a is approximately equal to zero
- the power of the receiving symbol 41 1 Ob is approximately equal to I s 2 I 2 .
- CO 1 is a symbol selection vector that is multiplied by H to select a transmission symbol vector in this process.
- CI 1 is a symbol selection vector that is multiplied by H to select a transmission symbol vector in this process.
- CO O is a symbol selection vector that is multiplied by H to select a transmission symbol vector in this process.
- the transmission symbol vector H + ⁇ C is calculated using the symbol selection vector C (C10, C01, C11, C00), and the transmission symbol vector H + ⁇ C is used as the transmitting station antenna.
- the transmission symbol vector H + ⁇ C is used as the transmitting station antenna.
- the transmitting station 201 selects H + CO when the transmission bit is 1, and sets the transmission bit to 0 when the transmission bit is 0. At this time, by selecting and transmitting H + ⁇ C1, the receiving station can determine the bit based on the power of the reception symbol 410a.
- the lookup table 308 generated by the transmission symbol calculation means 308 has a configuration as shown in FIG.
- the number of transmission station antennas is three, if considering that the channel matrix H is two rows and three columns, the number of the transmitting station antennas can be the same processing as the case of two, H + Is a 2-by-3 matrix, so wl and w 2 are each a three-dimensional vector.
- the propagation parameters between the transmitting station 201 and the receiving station 601 are calculated in advance using known symbols, and stored as a reference table.
- the transmission data 310 uses a transmission symbol such that the power change of the reception symbol 410 a at the receiving station 202 becomes the same as the data sequence of the transmission data 310. It is calculated as a combination of 314 and transmission symbol 315.
- the transmission symbols 314, 315 are processed in the single carrier modulation means 316 to generate transmission baseband signals 317a, 317b.
- the transmission baseband signals 317a and 317b are simultaneously converted into transmission RF signals 318a and 318b by the frequency conversion means 301, and then transmitted from the transmission station antennas 203a and 203b to the reception station 202. Sent to
- the receiving station antenna 204b similarly, the RF signals 318a and 318b are combined and received, and the baseband signal 408 received by the frequency conversion means 404 is similarly received. Converted to b.
- the spread span signal 408a is subjected to quadrature detection by the propagation parameter estimation unit 409 to generate a reception symbol 410a which is a complex symbol.
- the baseband signal 408b is subjected to orthogonal detection in the propagation parameter overnight estimating means 409 to generate a reception symbol 410b which is a complex symbol.
- the power difference between the reception symbols 410a and 410b is calculated by the symbol determination means 4111, and the power difference is determined based on a predetermined threshold. You. That is, it is determined that the symbol is 1 or 0 depending on whether the power difference is equal to or larger than the threshold. The result is output as received data 4 12.
- the transmission data 310 including the confidential information transmitted from the transmitting station 201 is restored.
- a third receiving station In order for a user to demodulate or recover the transmitted data 310 containing confidential information, the user must use four propagation channels formed between two antennas at the receiving station 61 and two antennas at the transmitting station. Need to be identified. Therefore, in this embodiment, it is possible to transmit confidential information with higher security.
- the single-carrier modulated signal 406 of the known symbol 401 at the receiving station 601 is separated from the receiving station antennas 204a and 204b using different time slots T1 and T2, respectively.
- the present invention is not limited to this, and it is not limited to this, and the receiving station cancels in the same time slot using known symbols P1 and P2 whose codes are orthogonal to each other.
- the known symbol P2 may be transmitted from the antenna 204a and the known symbol P2 may be transmitted from the receiving station antenna 204b.
- the reference symbol generating means 303 includes a reference symbol 304a having the same symbol as the known symbol P1 and a reference symbol 304a having the same symbol as the known symbol P2. 3 0 4 b. Then, the propagation channel estimating means 304 receives the received baseband signals 302 a and 302 b, and based on the reference symbol 304 a, the receiving station antenna 204 a and the transmitting station.
- Rx symbol 3 06 a which is an estimated value of the complex propagation channel between 0 3 a
- Rx symbol 3 which is the estimated value of the complex propagation channel between the receiving station antenna 204 a and the transmitting station antenna 203 b 0 7a is generated.
- receiving baseband signals 302a and 302b are input, and receiving station antenna 2 based on reference symbol 304b.
- the reception symbol 306 b which is an estimated value of the complex propagation channel between 0 4 b and the transmitting station antenna 203 b, and the complex propagation between the receiving station antenna 204 b and the transmitting station antenna 203 b
- a reception symbol 307 b which is an estimated value of the channel is generated.
- FIG. 20A shows an example in which a known symbol 401 is transmitted from two reception antennas 204a and 204b in a time-division manner.
- the known symbol 410 is transmitted from the reception antenna 204a within the time T1, and is transmitted from the reception antenna 204b within the time T2.
- the time required for transmitting the known symbol 401 from two antennas is defined as TR.
- Fig. 20B shows an example in which known symbols P1 and P2, whose codes are orthogonal to each other, are multiplexed from the receiving antennas 204a and 204b, respectively, and transmitted simultaneously during the TR time. ing. 1688
- multiple communication channels such as cellular TDMA (Time Division Multiple Access) method and WLAN frequency detection connection method (Carrier Sense Access) method, which share the time with each other, ensure wireless connection.
- TDMA Time Division Multiple Access
- WLAN frequency detection connection method Carrier Sense Access
- TD1 and TD2 represent the time allocated to different communication channels, respectively.
- TD1 and TD2 also vary depending on the length of the transmission data sequence, Conceivable.
- the time occupied by TD1 and TD2 does not have to be allocated periodically. Therefore, the time TR for transmitting the known symbol is determined in advance to use the time that TD1 and TD2 do not occupy, and the receiving station 202 determines that TR is occupied by TD1 and TD2. Assignments can be made at appropriate times within a short time, and known symbols can be transmitted.
- FIG. 8A is a diagram showing a wireless communication system 800 according to the present embodiment. 8A, the wireless communication system 800 is different from the wireless communication system of the first embodiment in that the wireless communication system 800 has a transmitting station 801 and a receiving station 802 and performs multi-carrier wireless communication represented by OFDM or the like. .
- FIG. 8B shows eight subcarrier components 803a to 803h constituting a multicarrier, and FIG.
- FIG. 8C shows a relationship between the transmitting station antenna 203a and the receiving station antenna 204a.
- Figure 8D shows the multicarrier power spectrum 8004a of propagation channel 205a
- Figure 8D shows the multicarrier power of propagation channel 205b between transmitting station antenna 203b and receiving station antenna 204a.
- the spectrum 804b is shown.
- power spectra 804a and 804b obtained from the propagation channel estimation values of the respective subcarrier components constitute the frequency spectrum of the entire multicarrier.
- the number of subcarriers is not limited to eight, and here, an eight subcarrier configuration is used for convenience in describing the present embodiment.
- the multi-carrier power spectrum 804 a and the multi-carrier power spectrum 804 b show different characteristics from each other, and furthermore, the multi-carrier power spectrum estimated by another radio station having a different propagation path.
- the frequency spectrum will also have different characteristics.
- FIGS. 9 and 11 the specific configuration of the transmitting station 801 is shown in FIGS. 9 and 11, and the specific configuration of the receiving station 802 is shown in FIG.
- the known symbol generation means 100000 is a known symbol shared between the transmitting station 800 and the receiving station 800 for each of the subcarrier components 803a to 803h.
- the multicarrier modulating means 1002 transmits the known symbol 11001 using the subcarrier components 803a to 803h.
- the frequency conversion means 1004 converts the transmission baseband signal 1004 into the transmission RF signal 1005 and receives it with the antenna 204a.
- the converted RF signal is converted into a baseband signal 108a.
- the propagation parameter overnight estimating means 1009 generates received symbols 1010a to 1010h which are complex symbols by orthogonal detection of the received baseband signal 1008a.
- the symbol determination unit 411 determines the symbol based on a predetermined determination criterion for the reception symbol 10a to 1010h.
- the antenna 204a transmits the RF signal 1005 as a multicarrier modulated signal 1006a.
- the transmitting station antennas 203a and 203b of the transmitting station 801 are connected to the receiving station.
- the RF signal transmitted from the 802 is simultaneously received and transmitted, and the frequency conversion means 901 converts the received RF signals 900a and 900b into the received base-spread signals 902a and 902b, respectively. To do.
- the reference symbol generating means 903 is the same symbol as the known symbol 1001, and generates a reference symbol 904 for providing a phase reference for the received baseband signals 902a and 902b.
- the 920 separates the received baseband signals 902a and 902b into eight subcarrier components 803a to 803h by fast Fourier transform (FFT) processing and band-limited filtering, and estimates the propagation channel.
- the means 905 includes, based on the reference symbol 904, eight received symbols 906a to 906h, which are estimated values of a complex propagation channel between the receiving station antenna 204a and the transmitting station antenna 203a, and the receiving station antenna 204a. It generates eight reception symbols 907a to 907h, which are estimated values of the complex propagation channel between the transmitting station antennas 203b. ,
- Transmission symbol calculation means 908a to 908h are associated with eight subcarrier components 803a to 803h.
- the transmission symbol calculation means 908a to 908h calculate a plurality of sets of transmission symbol vectors, each set including two transmission symbols for the transmission station antenna 203a and the transmission station antenna 203b.
- the transmission symbol calculating means 908a corresponding to the subcarrier component 803a corresponds to the subcarrier component 803a.
- the serial / Z-parallel conversion means 911 converts the transmission data sequence 910 into parallel components for each subcarrier component.
- the symbol mapping unit 913 From the transmission data 912 a to 912, the symbol mapping unit 913 generates transmission symbols 916 a to 916 b and a transmission symbol 917 such that the power of the reception symbols 1010 a to 1010 h of the receiving station 8002 is equal to or greater than or equal to a specific threshold. The combination with a to 917 h is calculated.
- the configuration of the symbol mapping unit 913 will be described below.
- FIG. 11 is a block diagram showing the configuration of the symbol mapping unit 913.
- the symbol mapping unit 913 includes table storage means 914 a to 914 h for storing reference tables 909 a to 909 h and symbol selection means 915 a to 915 h.
- the symbol selection means 915a to 915h correspond to the transmitting station antenna 203a by referring to the table storage means 914a to 914h for each subcarrier component 803a to 803h based on the transmission data 912a to 912h. This is to select the transmission symbols 917a to 917h corresponding to the transmission symbols 916a to 916h and the transmission station antenna 203b.
- the multicarrier modulation means 918 generates a baseband signal 919a for transmission by using the transmission symbol 916a to 916h as input and using the eight subcarrier components 803a to 803h, and 917a ⁇ 917h as input
- the baseband signal 919b for transmission is generated using eight subcarrier components 803a to 803h.
- a radio communication method performed between the transmitting station 801 and the receiving station 802 configured as described above will be described below.
- the known symbol 1001 generated for each of the subcarrier components 803 a to 803 h by the known symbol generating means 1000 of the receiving station 802 is modulated by the multicarrier modulation means 1002 into the baseband signal 1003 for transmission.
- the modulated transmission baseband signal 1003 is converted into a transmission RF signal 1005 by frequency conversion means 1004, and transmitted as a multicarrier modulation signal 1006a from the antenna 204a.
- the multicarrier modulated signal 1006 a of the known symbol 1001 transmitted from the receiving station 802 is simultaneously received by the antennas 203 a and 203 b of the transmitting station 801, and the received baseband signal 902 is transmitted by the frequency conversion means 901. a, 902 b.
- the baseband signals 902a and 902b are separated into eight subcarrier components 803a to 803h by carrier separation means 920. Then, in the propagation channel estimating means 905, processing is performed based on the reference symbol 904 generated by the reference symbol generating means 903, and the complex propagation channel between the receiving station antenna 204a and the transmitting station antennas 203a, 203b is processed. Eight received symbols 906 a to 906 h and 907 a to 907 h are generated as estimated values.
- the received symbols 906a to 906h and 907a to 907h are processed by transmission symbol calculation means 908a to 908h, and a plurality of sets of transmission symbol vectors for the transmission station antennas 203a and 203b are calculated. You. Then, eight reference tables 909 a to 90 composed of the plural sets of transmission symbol vectors are provided. 2003/011688
- the propagation parameters between the transmitting station 801 and the receiving station 802 are calculated in advance using known symbols, and stored as a reference table.
- the transmission data 910 to be concealed is first subjected to parallel conversion by the serial no-parallel conversion unit 911 and input to the symbol mapping unit 311.
- the transmitted signals 912 a to 912 h separated into eight signals are transmitted to the symbol mapping unit 913 using a lookup table, and the power change of the reception symbols 10 10 a to l 01 Oh at the receiving station 802 is transmitted. It is calculated as eight combinations of the combination of the transmission symbol 916 a and the transmission symbol 917 a and the combination of the transmission symbol 916 h and the transmission symbol 917 h that are identical to the data sequence of the data 910.
- the transmission symbols 916a-916h, 917a-917h are processed in the multi-carrier modulation means 918 to generate baseband signals 919a, 919b for transmission.
- the transmission baseband signal 919a is converted into the transmission RF signal 900a by the frequency conversion means 901 and then transmitted from the transmission station antenna 203a to the reception station 802.
- the transmitted paceband signal 919 b is converted to a transmitted RF signal 900 b by the frequency conversion means 901, and then transmitted from the transmitting station antenna 203 b to the receiving station 802.
- the transmitting RF signal 900a transmitted by the transmitting station antenna 203a of the transmitting station 801 and the transmitting RF signal 900b transmitted by the transmitting station antenna 203b are compared with the receiving station antenna.
- the signal is combined and received by 204a.
- the received RF signal 1005 is converted into a received baseband signal 1008 by frequency conversion means 1004.
- This baseband signal 1008a is subjected to high-speed Fourier transform (FFT) or band-limited filtering in carrier separation means 1020, and then separated into eight subcarrier components 803a to 803h by orthogonal detection. Is done.
- FFT Fourier transform
- reception parameters 1010 a to 1010 h which are complex symbols, are detected and generated by the propagation parameter overnight estimating means 1009.
- the generated received symbols 1010 a to 1010 h are subjected to a symbol determination process by a symbol determination unit 1011 based on a predetermined determination criterion, and received data 1012 a to 1012 h are generated. You.
- the received data 1012a to 1012h are converted to a serial data sequence 1014 by a parallel Z / serial conversion unit 1013, and the transmission data including confidential information transmitted from the transmitting station 801 is transmitted. Series 910 is restored.
- transmission data sequence 910 is a two-bit data sequence "10001101"
- this data sequence is sequentially assigned to subcarrier components to transmit information of eight bits.
- the symbol selection means 915 a determines that the power of the reception symbol 1010 a in the reception station 802 is equal to or higher than a specific threshold.
- the combination of the transmission symbol 916a and the transmission symbol 917a is selected from the table storage means 914a.
- the transmission data 912a is 0, the power of the reception symbol 1010a is a specific power.
- a combination of the transmission symbol 916a and the transmission symbol 917a that is equal to or less than the power threshold value 1401 is selected from the table storage unit 914a.
- the selected transmission symbol is modulated and transmitted from antennas 203a and 203b.
- each symbol of the reception symbol 1010 a to 1010 b separated into eight subcarrier components 803 a to 803 h from the received baseband signal 1008.
- the power is determined to be 1 when the power is equal to or higher than the specific power threshold 1400, and to 0 when the power is lower than the threshold, and demodulated. Then, if the determination result of the power of 1010a to 1010b matches 10001101 corresponding to 10001101 of the transmission data sequence, the data has been correctly transmitted.
- the multicarrier power spectrums 804a and 804b are dependent on the propagation space formed between the transmitting station and the receiving station and characterize the positional relationship between the transmitting and receiving stations. For this reason, even if the transmission signal is from the same transmission station 801, a frequency spectrum different from that of the multicarrier power spectrum 804 a and 804 b at the reception station 802 is observed at other reception stations other than the reception station 802. Will be done. Therefore, according to the present embodiment, it is difficult for a third party to demodulate or restore the transmission data sequence 910 including the confidential information by another receiving station.
- the transmission symbol calculating means 908 a to 908 h the transmission symbols 9 16 a to 9 16 h corresponding to the transmission station antenna 203 a and the transmission symbol corresponding to the transmission station antenna 203 are transmitted.
- Symbols 9 17 a to 9 17 h are complex sympols, respectively.
- the transmission symbol calculation means 908 a to 908 h controls the phase of the reception symbols 101 0 a to 110 h in the reception station 802 by using the transmission symbol. May be generated.
- the propagation parameter overnight estimating means 1009 estimates each of the received symbols 11010a to l010h as complex symbols. For this reason, in the symbol determination means 1009, for example, the reception symbol 11010a to l110h is mapped on the complex plane as a phase difference from the reference symbol, and this complex plane is mapped on the right half and the left half. It is possible to divide the symbols into symbols by determining in which area the reception symbol 1010a to 1010h is located.
- the wireless communication system 800 of this embodiment is configured such that, when a third party attempts to identify the transmission data sequence 9100, the transmission station 8101 and the reception station 80.2 are used for all of the plurality of subcarrier components. Since it is necessary to correctly estimate the propagation channel, data transmission with higher security is possible compared to a single-carrier wireless communication system.
- the present embodiment is realized by associating the subcarrier components of FDM with the spreading code of CDMA.
- the present invention can be applied to a CDMA.
- the wireless communication system of the present embodiment replaces the subcarrier components 803a to 803h with spreading codes C1 to C8. The operation at this time will be described below.
- the multicarrier modulation means 1002 spreads the known symbol 1001 with the spreading codes C1 to C8 to generate a baseband signal 1003 for transmission. Transmit by the receiving station antenna 204a.
- the propagation channel estimating means 905 despreads the received baseband signals 902a and 902b using eight spreading codes C1 to C8.
- eight reception symbols 906 a to 9 which are estimated values of the complex propagation channel between the receiving station antenna 204 a and the transmitting station antenna 203 a 0h and eight reception symposals 907a to 907h, which are estimated values of complex propagation channels between the receiving station antenna 204a and the transmitting station antenna 203b.
- the transmission symbol calculation means 908 a to 908 h from the reception symbols 9 06 a to 9 06 h and 9 07 a to 9 0 h, the transmission station antenna 20 3 a and the transmission A plurality of sets of transmission symbol vectors each including two transmission symbols for the station antenna 203 b are calculated, and the transmission symbol vectors are formed for each of the spreading codes C1 to C8.
- Eight reference tables 909 a to 909 h are generated.
- the propagation parameters between the transmitting station 801 and the receiving station 802 are calculated in advance using known symbols, and stored as a reference table. 003/011688
- the serial / parallel conversion means 911 converts the data into parallel, and the transmission data 910 is buffered every 8 data. You.
- the transmission data 912a to 912h are output to the symbol mapping section 913 in parallel.
- the transmission data 912a to 912h are converted into the reception symbols 1010a to l01 at the reception station 802 by using a reference table.
- the transmission symbol 916a to 916h is subjected to spreading processing using eight spreading codes C1 to C8 to perform a transmission baseband signal 919a. Is generated and transmitted from the transmitting station antenna 203a.
- the transmission symbols 917a to 917h generate a transmission baseband signal 919b by spreading processing using eight spreading codes C1 to C8, and the transmitting station antenna 2 Sent from 0 3 b.
- the signal received by the antenna 204a is transmitted to the propagation parameter estimating means 1009 by eight spreading codes for the received baseband signal 1008.
- Despreading processing is performed using C1 to C8.
- reception symbols 1010a to 1010h which are complex symbols separated and detected for the eight spreading codes C1 to C8, are generated by orthogonal detection.
- the estimated values of the propagation channels 205a and 205b obtained in advance are used. Can be used to generate transmission symbol lookup tables 909 a to 909 h.
- the propagation channel estimating means 905 shown in FIG. 9 is not required, and the configuration of the transmitting station 801 can be simplified. Since the combination of a plurality of antennas can be used by setting the number of antennas of the transmitting station 801 to three or more, a third party can transmit the transmitting data 910 including confidential information by another receiving station. It is more difficult to demodulate or recover.
- the transmitting station antennas 203a and 203b have different directivity patterns and polarizations, the power spectra 206a and 206b are estimated by a third party. This makes it more difficult to set up and secures higher security. (Example 4)
- FIG.12A shows a wireless communication system 1200 according to the fourth embodiment of the present invention, in which the receiving station 1 201 is connected to the receiving station antenna 204 a in addition to the receiving station antenna 204 b.
- the configuration is almost the same as that of the wireless communication system 800 of the third embodiment except that it has Fig. 12B shows the multicarrier electric spectrum 800c of the propagation channel 205c between the transmitting station antenna 203a and the receiving station antenna 204b, and Fig.
- a multicarrier power spectrum 804 d of a propagation channel 205 d between the station antenna 203 b and the receiving station antenna 204 b is shown. Note that the eight subcarrier components 803 a to 803 constituting the multicarrier are the same as those shown in FIG. 8B.
- FIG. 13 shows a specific configuration of the receiving station 122.
- the symbol generating means 1000 is a multi-carrier modulation signal 1003 of a known symbol 1001 for each of the subcarrier components 803a to 803h, as in the second embodiment. Transmitted separately using different time slots T1 and T2 by antennas 204a and 204b, respectively.
- the reference clock signal 1300 that determines the timing of each time slot is generated by the known symbol generation means 10000.
- FIG. 17 is a block diagram illustrating a configuration of the transmitting station 801 in the present embodiment.
- FIG. 17 differs from the transmitting station in the third embodiment in that the reference symbol generating means 903 generates a reference clock signal 1301 that determines the timing of the time slot T1 and the evening of T2.
- a radio communication method performed between the transmitting station 801 and the receiving station 1221, configured as described above, will be described below.
- the known symbol generated by the known symbol generation means 1003 of the receiving station 1 201 for each subcarrier component 803 a to 803 h is multi-modulated by the multicarrier modulation means 100.
- the signal is modulated into a baseband signal 1003 for transmission.
- the frequency conversion means 1004 switches the receiving station antennas 204a and 204b in the modulated transmission baseband signal 1003 in synchronization with the time slot.
- the transmitted RF signal 1005a is transmitted as the multicarrier modulated signal 1006a from the receiving station antenna 204a in the time slot T1
- the same transmitted RF signal 1005a is transmitted.
- b is transmitted as multi-carrier modulated signal 106 b from receiving station antenna 204 b in time slot T 2.
- the transmitting station 801 uses the transmitting station antennas 203a and 203b to transmit the multicarrier modulated signal 1006a transmitted from the receiving station antenna 204a, Receives the multicarrier modulated signal 106b transmitted from the station antenna 204b. You.
- frequency conversion means 901 separates the received signal of multicarrier modulated signal 1006a and the received signal of multicarrier modulated signal 1006b. Then, the reception baseband signals 902a and 902b corresponding to the transmitting station antennas 203a and 203b are generated for each time slot, and the carrier separation means 920 generates the reception baseband signals in the time slot T1.
- the PN signals 902a and 902b are converted into eight subcarrier components 803a to 803h, 921a to 921h and 922a to 922h, with eight subcarrier components 803a to 803h by fast Fourier transform (FFT) processing and band limiting filtering. Separated.
- FFT fast Fourier transform
- received symbols 906 a to 906 h which are processed based on the reference symbol 904 and are estimated values of a complex propagation channel between the receiving station antenna 204 a and the transmitting station antenna 203 a, and receive Receiving symbols 907a to 907h, which are estimated values of the complex propagation channel between the station antenna 204a and the transmitting station antenna 203b, are generated.
- the baseband signals 902a and 902b of the reception are input, and the subcarrier signals 921i to 921p and 922i, which are eight subcarrier components 803a to 803h. ⁇ 922p.
- the received symbols 906i to 906p which are estimated values of the complex propagation channel between the receiving station antenna 204b and the transmitting station antenna 203a, the receiving station antenna 204a and the transmitting station antenna Receiving symbols 907 i to 907 p which are estimated values of the complex propagation channel between 203 b are generated.
- received symbols 906 a to 906 h and 907 a to 907 h estimated from the received signal of the receiving station antenna 204 a, and received symbols 906 i to 906 p estimated from the received signal of the receiving station antenna 204 b 907 i to 907 p are sent The processing is performed by the symbol calculation means 908a to 908h, and a plurality of sets of transmission symbol vectors each including two transmission symbols for the transmission station antenna 203a and the transmission station antenna 203b are calculated. Then, eight reference tapes 909a to 909h composed of the plurality of sets of transmission symbol vectors calculated for each of the subcarrier components 803a to 803h are generated.
- the propagation parameters between the transmitting station 801 and the receiving station 1201 are calculated in advance by using known symbols, and stored as a reference table.
- the transmission data 910 to be concealed is first subjected to parallel conversion by the serial / parallel conversion unit 911 and input to the symbol mapping unit 311.
- the transmission signals 912 a to 912 h separated into eight signals are received by the symbol mapping unit 913 using a reference table, and the received symbols 1 010 a to 1010 h and 1010 i to 1010 p at the reception station 1201 are used.
- the transmission symbols 916a to 916h, 917a to 917h, 916i to 916p, and 917i to 917p are processed in the multi-carrier modulation means 918 to generate baseband signals 919a and 919b for transmission. You.
- the transmission baseband signal 919a is converted into the transmission RF signal 900a by the frequency conversion means 901 and then transmitted from the transmission station antenna 203a to the reception station 120a. Sent to one.
- the transmitting baseband signal 919b is converted into a transmitting RF signal 900b by the frequency converting means 901 and then transmitted from the transmitting station antenna 203b to the receiving station 802.
- the receiving station 1201 compares the transmitting RF signal 900a transmitted by the transmitting station antenna 203a of the transmitting station 801 and the transmitting RF signal 900b transmitted by the transmitting station antenna 203b with the receiving station antenna 204b.
- the RF signal 1005a obtained by combining and receiving the signals is converted by the frequency conversion means 1004 into the received baseband signal 1008a.
- the transmitting RF signal 900a and the transmitting RF signal 900b are combined and received by the receiving station antenna 204b, and the obtained RF signal 1005b is received by the frequency conversion means 1004 to receive the baseband signal 1008. Converted to b.
- the received baseband signal 1008a is subjected to fast Fourier transform (FFT) or band-limited filtering.
- FFT fast Fourier transform
- the propagation parameter overnight estimating means 1009 the reception symbol 1010a to 1010h, which is a complex symbol, is separated into eight subcarrier components 803a to 803h by quadrature detection, and is generated.
- the received baseband signal 1008b is subjected to fast Fourier transform (FFT) or band-limited filtering in carrier separation means 1020, the eight subcarrier components 803a to 803a to Received symbols 1010i to 1010p, which are complex symbols detected separately for 803h, are generated.
- the symbol determination means 1011 the power difference between the reception symbols 1010 a to 1010 h and 1010 i to l 010 ⁇ is calculated. Then, a symbol determination process is performed based on a predetermined determination criterion, and received data 1012a to L012h are generated. Next, the received data 1012 a to 1012 h are converted into a serial data sequence 1014 by a parallel Z / serial conversion unit 1013, and the transmission data sequence including confidential information transmitted from the transmitting station 801 is transmitted. 910 is restored. f
- FIG. 15 shows the power difference between the sub-carrier components 803 a to 803 h for the reception symbol 1010 a to: LO lO h and 1010 i to 1010 p. This indicates the operation that determined 1 or 0.
- the power difference when the power difference is positive, it is coded as 1, and when it is negative, it is coded as 0.
- the symbol value is set to 1, and conversely, the reception 1010 i to 1010 p is larger. In this case, it is determined that the symbol value is 0.
- a third party may use another transmitting station. To demodulate or recover the transmitted data 310 containing confidential information, all four propagation channels consisting of two antennas at the receiving station 1201 and two antennas at the transmitting station must be identified. This makes it possible to transmit confidential information with higher security.
- the multicarrier modulation signal of the known symbol 1001 is transmitted separately from the receiving station antennas 204a and 204b using different time slots T1 and T2, but not limited thereto.
- the known symbol P1 is multicarrier-modulated from the receiving station antenna 204a and transmitted in the same time slot, and transmitted from the receiving station antenna 204b.
- a configuration for transmitting a known symbol P 2 by multi-carrier modulation and You may.
- the reference symbol generation means 903 generates a reference symbol R1 that is the same symbol as the known symbol P1 and a reference symbol R2 that is the same symbol as the known symbol P2. Then, the carrier separating means 920 separates the received baseband signals 902a and 902b into eight subcarrier components 803a to 803 by fast Fourier transform (FFT) processing or band limiting filtering processing, and then propagates. Based on the reference symbol R1, the channel estimator 905 transmits the received symbols 906a to 906h, which are estimated values of the complex propagation channel between the receiving station antenna 204a and the transmitting station antenna 203a, and the receiving station antenna 204a.
- FFT fast Fourier transform
- received symbols 907a to 907h which are estimated values of the complex propagation channel between the transmitting station antennas 203b.
- received symbols 907a to 907h which are estimated values of the complex propagation channel between the transmitting station antennas 203b.
- reception symbols 906i to 906p and reception symbols 907i to 907p which are estimated values of complex propagation channels between reception station antenna 204a and transmission station antenna 203b.
- the configuration of the radio system assuming the frequency multiplexing system represented by OFDM has been described.However, the subcarrier components of OFDM are associated with the CDMA spreading code, and It can be applied to CDMA using a wireless communication system having a similar configuration.
- the subcarrier components 803a to 803h are replaced with spreading codes C1 to C8.
- the receiving station 1201 uses the known codes for the spreading codes C1 to C8. 00 hire 1688
- the received baseband signals 902a and 902b are divided into eight spreading codes C1-C.
- the received symbol 90 which is an estimated value of the complex propagation channel between the receiving station antenna 204 a and the transmitting station antenna 203 a based on the reference symbol 94 4 6a ⁇ 906h, receiving station antenna 204a and transmitting station antenna 20
- Receiving symbols 907a to 907h which are estimated values of the complex propagation channel between 3b, are generated, respectively. Similarly, in time slot T2, the reception
- the reception symbols 9 06 a to 9 06 h and 9 0 7 a to 9 0 h estimated from the reception signal of the reception station antenna 204 a are received.
- the transmitting station antenna 203 a and the transmitting station antenna 203 A plurality of sets of transmission symbol vectors, each of which includes two transmission symbols for b, are calculated.
- eight reference tables 909 a to 909 h composed of the plurality of sets of transmission symbol vectors calculated for the spreading codes C1 to C8 are generated.
- the propagation parameters between the transmitting station 8 0 1 and the receiving station 1 2 0 1 are calculated in advance using known symbols and stored as a reference table.
- transmission data 910 is converted into a combination of transmission symbols using a reference table in the same manner as in the case of OFDM described above, and transmitted from transmission antennas 203a and 203b.
- reception symbols 1010a to 1010h which are complex symbols separated and detected for the eight spreading codes C1 to C8, are generated by orthogonal detection.
- the transmission data sequence 910 including the confidential information transmitted from the transmission station 801 is restored based on the reception symbols 1010a to 1010h and the reception symbols 1010i to 1010p. .
- the number of antennas of the receiving station 1201 By setting the number of antennas of the receiving station 1201 to three or more, more combinations of antennas can be used. For this reason, it becomes more difficult for a third party to demodulate or restore the transmission data sequence 910 including the confidential information by another receiving station, and higher security can be ensured.
- high security can be ensured in the physical layer of communication.
- these processes can be basically performed independently of encryption and decryption using the conventional arithmetic method, higher processing can be achieved by implementing the present invention in addition to the conventional technology. You can expect security.
- FIG. 21 is a block diagram showing the configuration of the antenna array transmitting station of the present embodiment.
- the amplitude / phase controllers 2102a to 2102n control the amplitude and phase of the signal from each antenna to form a directional beam.
- the configuration blocks of the other branches are the same as those of the third embodiment.
- a propagation channel estimation unit, a reference symbol generation unit, and a transmission symbol calculation unit for receiving a known symbol from the receiving station and generating a reference table are not shown, but are similar to those in the third embodiment. Prepared for each branch.
- FIG. 22 is a block diagram showing the configuration of the array antenna receiving station of this embodiment.
- the symbols from the known symbol generating means 100 0 are modulated by the multi-carrier converting means 100 2, and then the amplitude and phase are controlled by the amplitude and phase control sections 220 a to 220 n.
- the difference from the third embodiment is that a directional beam is generated for each antenna.
- Other configuration blocks are the same as those of the third embodiment.
- the transmitting station forms a plurality of directional beams, and by appropriately combining the beams, it is possible to control the reception power of the antenna of the receiving station 202.
- the transmitting station 801 individually controls the position on the frequency axis of the single carrier component detected from the multicarrier received signal at the receiving station 1221, and transmits transmission bit information. It is also possible to transmit.
- the transmitting station individually controls the transmitting antennas based on the propagation parameters that are unique values between the transmitting station and the receiving station, and changes the directivity pattern, thereby obtaining the receiving antennas. It controls the received power of each single carrier component at the end.
- the position on the frequency axis of each single carrier constituting the multicarrier signal received by the receiving station is associated with the transmission bit information. For example, if the multi-carrier transmission signal is composed of eight single carriers, the transmission bit information of three bits from 0000 to 11 1 for single carriers f 1 to f 8 on the frequency axis Are associated in advance.
- the transmitting station changes the directivity pattern of the transmitting antenna, and the single carrier f 3 is received at the receiving station with the maximum power compared to other single carrier components. Control.
- the receiving station calculates the frequency spectrum of the received signal, and if the single carrier f 3 is estimated to have the maximum power, the transmission bit information can be determined to be 0 10.
- the transmitting station controls the transmission power of each single carrier constituting the multicarrier. This method does not cause a large drop in the received power in a multipath fading environment, causes bit errors, and the transmitted bit information is easily estimated by another third-party radio station. None.
- the transmitting station changes the directivity pattern of the transmitting antenna on the basis of the propagation parameter that is a unique value between the transmitting station and the receiving station.
- Controlling the received power of the single carrier component Can be.
- bit errors due to multipath fading can be compensated.
- the present invention is useful for a communication method for performing wideband wireless communication between specific wireless stations, and is suitable for transmitting confidential information with high security.
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Computer Security & Cryptography (AREA)
- Power Engineering (AREA)
- Mobile Radio Communication Systems (AREA)
- Radio Transmission System (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2003266513A AU2003266513A1 (en) | 2002-09-19 | 2003-09-12 | Transmitting apparatus, receiving apparatus, radio communication method, and radio communication system |
EP03797584A EP1531558B1 (en) | 2002-09-19 | 2003-09-12 | Device and method for transmitting encrypted data over a broadband channel |
DE60315470T DE60315470T2 (de) | 2002-09-19 | 2003-09-12 | Vorrichtung und Verfahren zur Übertragung von verschlüsselten Daten über einen breitbanden Kanal |
US10/520,028 US7720172B2 (en) | 2002-09-19 | 2003-09-12 | Transmitting apparatus receiving apparatus, radio communication method and radio communication system |
Applications Claiming Priority (4)
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JP2002272534 | 2002-09-19 | ||
JP2002-272534 | 2002-09-19 | ||
JP2003297117A JP4381749B2 (ja) | 2002-09-19 | 2003-08-21 | 無線通信装置及び無線通信方法 |
JP2003-297117 | 2003-08-21 |
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WO2004028031A1 true WO2004028031A1 (ja) | 2004-04-01 |
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PCT/JP2003/011688 WO2004028031A1 (ja) | 2002-09-19 | 2003-09-12 | 送信装置、受信装置、無線通信方法及び無線通信システム |
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US (1) | US7720172B2 (ja) |
EP (1) | EP1531558B1 (ja) |
JP (1) | JP4381749B2 (ja) |
CN (1) | CN100488097C (ja) |
AU (1) | AU2003266513A1 (ja) |
DE (1) | DE60315470T2 (ja) |
WO (1) | WO2004028031A1 (ja) |
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WO2006075243A1 (en) * | 2005-01-13 | 2006-07-20 | Ferraro C & S S.R.L. | Method and device for the generation and authentication of a cryptographic key used for the reciprocal authentication of two mobile terminals |
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RU2007107380A (ru) * | 2004-07-29 | 2008-09-10 | Мацусита Электрик Индастриал Ко., Лтд. (Jp) | Устройство беспроводной связи и способ беспроводной связи |
WO2007023530A1 (ja) | 2005-08-23 | 2007-03-01 | Mitsubishi Denki Kabushiki Kaisha | 無線通信システムおよび通信装置 |
WO2007031089A1 (en) * | 2005-09-15 | 2007-03-22 | Aalborg Universitet | A method for secure communication in a wireless communication system |
WO2007031088A1 (en) * | 2005-09-15 | 2007-03-22 | Aalborg Universited | A method for sending secure information or increasing communication capacity via coding of wavefronts and a system using said method |
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JP5177527B2 (ja) * | 2008-07-28 | 2013-04-03 | シャープ株式会社 | 通信システム、受信装置及び通信方法 |
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KR20150004497A (ko) * | 2013-07-02 | 2015-01-13 | 한국전자통신연구원 | 태그 송신 장치 및 방법과 리더 수신 장치 |
DE102013011529B3 (de) * | 2013-07-10 | 2014-10-16 | Audi Ag | Rundfunkempfangsgerät |
CN104394529B (zh) * | 2014-11-27 | 2018-09-04 | 北京智谷睿拓技术服务有限公司 | 发射控制方法及装置、信息获取方法及装置 |
JP6476962B2 (ja) * | 2015-02-13 | 2019-03-06 | オムロン株式会社 | 無線通信制御システム、無線通信制御装置、無線通信制御方法、及び指向性情報生成方法 |
TWI583145B (zh) * | 2015-09-22 | 2017-05-11 | 啟碁科技股份有限公司 | 射頻收發系統 |
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- 2003-09-12 WO PCT/JP2003/011688 patent/WO2004028031A1/ja active IP Right Grant
- 2003-09-12 DE DE60315470T patent/DE60315470T2/de not_active Expired - Fee Related
- 2003-09-12 EP EP03797584A patent/EP1531558B1/en not_active Expired - Fee Related
- 2003-09-12 AU AU2003266513A patent/AU2003266513A1/en not_active Abandoned
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Also Published As
Publication number | Publication date |
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JP2004135302A (ja) | 2004-04-30 |
JP4381749B2 (ja) | 2009-12-09 |
EP1531558B1 (en) | 2007-08-08 |
EP1531558A1 (en) | 2005-05-18 |
CN100488097C (zh) | 2009-05-13 |
DE60315470D1 (de) | 2007-09-20 |
US20060058061A1 (en) | 2006-03-16 |
EP1531558A4 (en) | 2006-04-05 |
CN1672344A (zh) | 2005-09-21 |
DE60315470T2 (de) | 2008-03-20 |
US7720172B2 (en) | 2010-05-18 |
AU2003266513A1 (en) | 2004-04-08 |
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