WO2019151480A1 - 送信装置、無線通信システムおよび送信方法 - Google Patents
送信装置、無線通信システムおよび送信方法 Download PDFInfo
- Publication number
- WO2019151480A1 WO2019151480A1 PCT/JP2019/003625 JP2019003625W WO2019151480A1 WO 2019151480 A1 WO2019151480 A1 WO 2019151480A1 JP 2019003625 W JP2019003625 W JP 2019003625W WO 2019151480 A1 WO2019151480 A1 WO 2019151480A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- modulation
- unit
- signal
- frequency offset
- frequency
- Prior art date
Links
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0667—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of delayed versions of same signal
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0667—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of delayed versions of same signal
- H04B7/0671—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of delayed versions of same signal using different delays between antennas
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/005—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
- H04B1/0067—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with one or more circuit blocks in common for different bands
- H04B1/0082—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with one or more circuit blocks in common for different bands with a common local oscillator for more than one band
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B2001/6912—Spread spectrum techniques using chirp
Definitions
- the present invention relates to a transmission device, a wireless communication system, and a transmission method.
- This application claims priority based on Japanese Patent Application No. 2018-016635 filed in Japan on February 1, 2018, the contents of which are incorporated herein by reference.
- Time diversity is a general term for diversity techniques that use two or more paths that are separated in time, such as a method of transmitting the same signal at different timings and selecting a signal with a high level.
- spatial diversity is a general term for diversity technology that uses two or more spatially separated paths, such as a method of preparing two or more antennas and selecting the highest level antenna. .
- time diversity when the period of level fluctuation is long, that is, when the moving speed of the terminal is slow, the correlation of paths that are separated in time increases, and the diversity effect decreases. For this reason, in order to perform high-quality transmission with wireless terminals under various situations, application of space diversity is essential.
- FIG. 13 is a block diagram showing a configuration of the wireless communication system 90 disclosed in Patent Document 1.
- the wireless communication system 90 includes a transmission device 70 and a reception device 80 having two transmission antennas 76 (76-1 and 76-2).
- the transmission device 70 gives different frequency offsets to the transmission antennas 76-1 and 76-2 by the frequency offset applying means 74-1 and 74-2, respectively, and receives the reception device 80.
- the transmission device 70 transmits a plurality of signals to which different frequency offsets are given, the reception level varies on the reception side due to the frequency difference between the signals. Thereby, it is possible to avoid a steady drop in the reception level.
- reception level fluctuation is further forcibly generated. Due to this reception level fluctuation, the reception quality of the demodulated information series varies. Therefore, the wireless communication system 90 uses the interleaver 72 of the transmission device 70 and the deinterleaver 85 of the reception device 80 to randomize the reception quality variation of the demodulated information sequence due to the reception level fluctuation. The wireless communication system 90 obtains a diversity effect by relieving random errors due to variations in reception quality with an error correction code.
- the receiving device 80 in the wireless communication system 90 described in Patent Document 1 described above decodes the deinterleaver 85 and the error correction code. It is necessary to have the configuration of the means 86.
- the present invention has been made in consideration of such circumstances, and a transmitter and a wireless device that can obtain a diversity effect even in communication with a general receiver that does not assume application of frequency offset diversity
- An object is to provide a communication system and a transmission method.
- the transmission apparatus is obtained by duplicating the modulation unit that generates a modulation signal by chirp spreading modulation of an input information sequence, and the modulation signal generated by the modulation unit For each of the plurality of modulation signals, a delay unit that gives delays having different lengths and a difference between the delays being an integral multiple of the reciprocal of the bandwidth of the modulation signal, and the delay unit And a plurality of transmission antennas that transmit each of the plurality of modulated signals to which a delay is added.
- the delay unit adds the delay to a digital signal indicating the plurality of modulated signals.
- the delay unit gives the delay to the analog signals indicating the plurality of modulated signals.
- the wireless communication system includes a transmission device and a reception device.
- the transmission apparatus includes: a modulation unit that performs chirp spread modulation on an input information sequence to generate a modulation signal; and a plurality of modulation signals obtained by replicating the modulation signal generated by the modulation unit.
- a delay unit having a delay having a different length and a difference between the delays being an integral multiple of the reciprocal of the bandwidth of the modulation signal, and the plurality of the delay units provided with the delay
- the reception device receives the plurality of modulated signals transmitted from the plurality of transmission antennas of the transmission device and acquires a reception signal, and the reception signal acquired by the reception antenna,
- a receiver that performs frequency conversion and analog-digital conversion and generates a digital signal by the conversion; and a demodulator that demodulates the digital signal generated by the receiver.
- a transmission method is a transmission method by a transmission device, wherein a modulation step is performed by chirp spreading modulation of an input information sequence, and the modulation generated by the modulation step
- a modulation step is performed by chirp spreading modulation of an input information sequence, and the modulation generated by the modulation step
- Each of a plurality of modulated signals obtained by duplicating the signal is provided with a delay having a different length and a difference between the delays being an integral multiple of the reciprocal of the bandwidth of the modulated signal.
- a transmission device that modulates an input information sequence to generate a modulation signal, and a plurality of modulation units that are obtained by duplicating the modulation signal generated by the modulation unit.
- a frequency offset giving a frequency offset different from each other and a difference between the frequency offsets being an integral multiple of the symbol rate, and the frequency offset given by the frequency offset giving unit A plurality of transmission antennas for transmitting each of the given modulation signals.
- the frequency offset assigning unit in the transmission device according to the sixth aspect, the frequency offset assigning unit generates a local oscillator that generates a carrier signal for each of the plurality of modulation signals, and the modulation signal.
- a frequency converter that performs frequency conversion using the carrier signal; and a band limiting filter that suppresses carrier leak and image leak generated by the frequency conversion.
- the frequency offset assigning unit generates first and second carrier signals having different frequencies for each of the plurality of modulated signals.
- a local oscillator, a first frequency converter that performs frequency conversion on the modulated signal using the first carrier signal, and carrier leak and image leak generated by the frequency conversion by the first frequency converter A second frequency converter that performs frequency conversion on a signal output from the first band-limiting filter using the second carrier signal, and the second carrier signal.
- a second band limiting filter that suppresses carrier leak and image leak generated by the frequency conversion by the frequency converter.
- the frequency offset adding unit includes a variable phase shifter that adaptively changes the phase of the modulation signal for each of the plurality of modulation signals. And a control unit for controlling the variable phase shifter.
- the frequency offset adding unit performs phase shift by the variable phase shifter for each of the plurality of modulated signals according to control by the control unit.
- a variable attenuator for attenuating the amplitude of the modulated signal having changed.
- the wireless communication system includes a transmission device and a reception device.
- the transmission apparatus performs a modulation unit that spread-modulates an input information sequence to generate a modulation signal, and a plurality of modulation signals obtained by duplicating the modulation signal generated by the modulation unit.
- a frequency offset applying unit that applies different frequency offsets and a difference between the frequency offsets is an integral multiple of a symbol rate, and the plurality of modulations to which the frequency offset is applied by the frequency offset applying unit And a plurality of transmitting antennas for transmitting each signal.
- the reception device receives the plurality of modulated signals transmitted from the plurality of transmission antennas of the transmission device and acquires a reception signal, and the reception signal acquired by the reception antenna,
- a receiver that performs frequency conversion and analog-digital conversion and generates a digital signal by the conversion; and a demodulator that demodulates the digital signal generated by the receiver.
- a transmission method is a transmission method by a transmission device, wherein a modulation step is performed by spreading and modulating an input information sequence, and the modulation signal generated by the modulation step For each of a plurality of modulated signals obtained by copying the frequency offset, the frequency offset giving step to give a frequency offset that is different from each other and the difference between the frequency offsets is an integral multiple of the symbol rate, And a transmitting step of transmitting each of the plurality of modulated signals to which the frequency offset has been applied by a frequency offset applying step from a plurality of transmitting antennas.
- the present invention in a wireless communication system using spread modulation, by applying an appropriate frequency offset or delay, it is common not to use an interleaver or an error correction code, that is, to apply frequency offset diversity. A diversity effect can be obtained even if a receiving apparatus is used.
- the block diagram which shows the structure of the transmitter which concerns on 1st Embodiment The block diagram which shows the structure of a general receiver in digital radio
- the block diagram which shows the structure of the transmitter which concerns on 4th Embodiment. 1 is a block diagram showing a configuration of a wireless communication system disclosed in Patent Document 1.
- the wireless communication system obtains a transmission diversity effect by transmission using a plurality of transmission antennas, and includes a transmission device and a reception device.
- FIG. 1 is a block diagram showing a configuration of a transmission apparatus 1 according to the first embodiment of the present invention.
- the transmission apparatus 1 includes a modulation unit 11, M frequency offset assignment units 12 (12-1, 12-2,..., 12-M), and M radio units 13 (13-1, 13-2,..., 13-M). Further, M radio units 13 (radio units 13-1 to 13-M) are connected to M transmit antennas 14 (14-1, 14-2,..., 14-M), respectively. .
- the modulation unit 11 performs spread modulation on the input information sequence S10.
- Modulator 11 applies symbol sequence S11, which is a symbol sequence obtained by spreading modulation of information sequence S10, to frequency offset assigning units 12 (12-1, 12-2,..., 12-M). Output. That is, the duplicated symbol series S11 is supplied to each of the frequency offset assigning units 12 (12-1, 12-2,..., 12-M).
- the modulation unit 11 performs, as spread modulation, direct spread spectrum using a spread code, frequency hopping spread spectrum that switches frequencies, or chirp spread spectrum that uses a signal whose frequency changes linearly (for example, a sine wave signal). Either one is used.
- the frequency offset assigning unit 12 (12-1, 12-2,..., 12-M) acquires the symbol series S11 output from the modulation unit 11.
- the frequency offset assigning unit 12 (12-1, 12-2,..., 12-M) assigns a frequency offset to the acquired symbol sequence S11.
- the frequency offsets that each frequency offset assigning unit 12 assigns to the symbol series S11 are different from each other.
- M symbol sequences S12 S12-1, S12-2,..., S12-M
- the frequency offset assigning unit 12 (12-1, 12-2,..., 12-M) wirelessly transmits the generated symbol sequence S12 (S12-1, S12-2,..., S12-M). Output to the unit 13 (13-1, 13-2,..., 13-M).
- the radio unit 13 (13-1, 13-2,..., 13-M) outputs the frequency output from the frequency offset adding unit 12 (12-1, 12-2,..., 12-M).
- the symbol series S12 (S12-1, S12-2,..., S12-M) to which the offset is assigned is acquired.
- the radio unit 13 (13-1, 13-2,..., 13-M) performs analog processing on the acquired symbol series S12 (S12-1, S12-2,..., S12-M). Perform conversion and frequency conversion.
- the symbol sequence S12 (S12-1, S12-2,..., S12-M) is transferred to M transmission signals S13 (S13-1, S13-2,..., S13-M), respectively. Converted.
- the wireless unit 13 (13-1, 13-2,..., 13-M) converts the converted transmission signal S13 (S13-1, S13-2,..., S13-M) into M pieces of signals. Each of the signals is transmitted to the receiving device 2 described below through the transmitting antennas 14 (14-1, 14-2,..., 14-M).
- FIG. 2 is a block diagram showing a configuration of a general receiving device 2 in digital wireless communication.
- the reception device 2 includes a radio unit 22 and a demodulation unit 23.
- the radio unit 22 is connected to the receiving antenna 21.
- the reception antenna 21 receives a radio signal transmitted from the transmission device 1.
- the radio unit 22 (reception unit) performs frequency conversion and conversion to a digital signal on the reception signal S21 received through the reception antenna 21.
- the radio unit 22 outputs a digital signal S22 obtained by performing frequency conversion and analog-digital conversion on the received signal S21 to the demodulation unit 23.
- the demodulator 23 demodulates the digital signal S22 output from the radio unit 22 and converts it into a signal sequence S23.
- the demodulator 23 performs frequency fluctuation, amplitude fluctuation, and phase fluctuation generated in the radio signal on the transmission path between each transmission antenna 14 and the reception antenna 21 by equalizing the digital signal S22. To compensate.
- the frequency offset assigning unit 12 (12-1, 12-2,..., 12-M) is configured so that the difference between all the frequency offsets assigned to the symbol sequence S11 is an integral multiple of the symbol rate fs. A frequency offset is added to the symbol series S11. The symbol rate fs is the reciprocal of the time interval between adjacent symbols included in the symbol sequence S11.
- FIG. 3 is a diagram showing the frequency offset intervals given by the frequency offset assigning unit 12 (12-1, 12-2,..., 12-M).
- the symbol sequence S11 output from the modulation unit 11 is set to x (t)
- j represents an imaginary unit.
- the channel response between the m-th transmitting antenna 14-m and the receiving antenna 21 and h m, when the digital signal S22 outputted from the radio unit 22 and z (t), z (t ) is It is represented by the following formula (2).
- the demodulator 23 generally has an adaptive equalization function that compensates for variations in phase and amplitude within one symbol with respect to a radio signal obtained by spreading modulation of an information sequence.
- the demodulator 23 has such an adaptive equalization function, it is possible to estimate the reception quality with the reception level per symbol.
- the reception level ⁇ ( ⁇ t) per symbol at the time ⁇ t is expressed by the following equation (3).
- the value of the reception level ⁇ ( ⁇ t) is a value obtained by adding the squares of the absolute values of the channel responses between all the transmission antennas 14 and the reception antennas 21. This is the same value as when the maximum ratio combining diversity reception is performed on the receiving side. Therefore, the transmission diversity effect can be obtained by compensating for the fluctuation of one symbol period included in the channel response ⁇ ( ⁇ t) of Expression (3).
- the demodulation unit 23 included in the reception device 2 includes an adaptive equalization function that compensates for variations in frequency, amplitude, and phase that occur in a radio signal in the transmission path.
- the demodulator 23 compensates for the above-described variation included in the digital signal S22 by this adaptive equalization function, and cancels the frequency offset given to the symbol sequence S11 in the transmission device 1. This is because the frequency fluctuation generated in the transmission path and the frequency offset given in the transmission apparatus 1 are handled in the same way in adaptive equalization. That is, the receiving device 2 of the wireless communication system can obtain a transmission diversity effect similar to the maximum ratio combining diversity effect without including a deinterleaver or an error correction code decoder required in the conventional transmission diversity method. Can do.
- the function of the demodulator 23 is a function that a general receiving device also has. Therefore, even if the receiving apparatus is not suitable for the existing transmission diversity system, the transmission diversity effect can be obtained by using the transmitting apparatus 1.
- FIG. 4 is a flowchart showing the operation of the transmission apparatus 1 according to the first embodiment of the present invention. This flowchart starts when the information sequence S10 is input to the modulation unit 11.
- the modulation unit 11 receives an input of the information series S10 (step S1). Modulator 11 spreads and modulates input information sequence S10 to generate symbol sequence S11 (step S2).
- the frequency offset assigning unit 12 (12-1, 12-2,..., 12-M) assigns a frequency offset to the symbol sequence S11 that is spread-modulated by the modulating unit 11 (step S3).
- M symbol sequences S12 (S12-1, S12-2,..., S12-M) are generated.
- the frequency offsets assigned to the symbol series S11 by the frequency offset assigning unit 12 are different from each other.
- the radio unit 13 applies the symbol series S12 (S12-1, S12-2,..., S12-M) to which the frequency offset is assigned.
- analog conversion and frequency conversion are respectively performed (step S4).
- the symbol sequence S12 (S12-1, S12-2,..., S12-M) is converted into M transmission signals S13 (S13-1, S13-2,..., S13-M). Is done.
- the wireless unit 13 (13-1, 13-2,..., 13-M) converts the converted transmission signal S13 (S13-1, S13-2,..., S13-M) into M pieces of signals. It transmits to the receiver 2 through the transmitting antenna 14 (14-1, 14-2,..., 14-M) (step S5).
- the process of the flowchart shown in FIG. 4 ends.
- the transmission device 1 is a transmission device that transmits spread-modulated radio signals from a plurality of transmission antennas.
- the transmission apparatus 1 includes a modulation unit 11 that spread-modulates an input information sequence.
- the transmission apparatus 1 is configured such that, for each of the M modulation signals obtained by duplicating the modulation signal generated by the modulation unit 11, the difference between all the frequency offsets added to the modulation signal is the symbol rate.
- the frequency offset provision part 12 which provides the frequency offset used as the integer multiple of is provided.
- the transmission apparatus 1 further includes a wireless unit 13 that transmits M modulated signals to which the frequency offset is added by the frequency offset applying unit 12 through a plurality of transmission antennas.
- m 1, 2,..., M
- a special function is added by demodulating the received signal by utilizing a multipath equalization function that is normally provided in a diffusion modulation wireless chip such as a LoRa (Long Range) (registered trademark) chip, for example.
- LoRa Long Range
- the wireless communication system using spread modulation according to the first embodiment by giving an appropriate frequency offset on the transmission side, without using an interleaver or an error correction code on the reception side, That is, the diversity effect can be obtained by using a general receiver that does not assume application of frequency offset diversity.
- FIG. 5 is a block diagram showing a configuration of the transmission device 3 according to the second embodiment of the present invention.
- the transmission device 3 includes a modulation unit 31, a radio unit 32, and M frequency offset addition units 33 (33-1, 33-2,..., 33-M). I have.
- the frequency offset assigning unit 33 (33-1, 33-2,..., 33-M) includes M transmission antennas 34 (34-1, 34-2,..., 34-M). Each is connected.
- the modulation unit 31 performs spread modulation on the input information sequence S30.
- Modulator 31 outputs symbol sequence S31, which is a symbol sequence obtained by spreading and modulating information sequence S30, to radio unit 32.
- the radio unit 32 acquires the symbol series S31 output from the modulation unit 31.
- the radio unit 32 performs analog conversion and frequency conversion on the acquired symbol series S31. By these conversions, the symbol series S31 is converted into an analog signal S32.
- the radio unit 32 outputs the converted analog signal S32 to the frequency offset applying unit 33 (33-1, 33-2,..., 33-M).
- the frequency offset assigning unit 33 acquires the analog signal S32 output from the wireless unit 32, respectively.
- the frequency offset assigning unit 33 assigns a frequency offset to the acquired analog signal S32.
- the frequency offsets applied to the analog signal S32 by the frequency offset applying unit 33 are different from each other.
- M transmission signals S33 S33-1, S33-2,..., S33-M are generated.
- the frequency offset assigning unit 33 (33-1, 33-2,..., 33-M) converts the generated transmission signal S33 (S33-1, S33-2,..., S33-M) into M
- Each of the transmission antennas 34 (34-1, 34-2,..., 34-M) is transmitted to the receiving device 2.
- the transmission device 1 according to the first embodiment described above is configured to add a frequency offset to the digital signal indicating the symbol sequence S11.
- the transmission device 3 according to the second embodiment is configured to give a frequency offset to the analog signal S32.
- the radio units 32 can be combined into one.
- the transmission device 3 according to the second embodiment can further reduce the cost as compared with the transmission device 1 according to the first embodiment.
- means for giving a frequency offset to an analog signal there are means using a frequency converter or means using a variable phase shifter.
- the configuration of the frequency offset applying unit using the frequency converter and the configuration of the frequency offset applying unit using the variable phase shifter will be described with reference to the drawings.
- FIGS. 6 and 7 are block diagrams respectively showing a frequency offset applying unit 331_m and a frequency offset applying unit 332_m as first and second configuration examples of the frequency offset applying unit using the frequency converter.
- the frequency offset adding unit 331_m includes a local oscillator 3311_m, a frequency converter 3312_m, and a band limiting filter 3313_m.
- the local oscillator 3311_m generates a carrier signal having a frequency ⁇ fc + m ⁇ fs.
- the local oscillator 3311_m outputs the generated carrier signal to the frequency converter 3312_m.
- the frequency ⁇ fc is a difference between the center frequency of the analog signal output from the radio unit 32 and the center frequency of the transmission signal when no frequency offset is given.
- the frequency converter 3312_m receives the input of the carrier signal output from the local oscillator 3311_m.
- the frequency converter 3312_m generates a signal that is offset by the frequency fc + m ⁇ fs by using the input carrier signal.
- the frequency converter 3312_m outputs the generated signal to the band limiting filter 3313_m.
- the band limiting filter 3313 — m receives the input of the signal output from the frequency converter 3312 — m.
- the band limiting filter 3313_m suppresses carrier leaks (local leaks) and image leaks (image signals) that occur as a result of frequency conversion with respect to the input signals, and selects only desired signals that have been frequency offset. Transparent.
- the frequency offset adding unit 331_m can generate a signal with a frequency offset added to the analog signal S32.
- the band limiting filter 3313_m in the frequency offset assigning unit 331_m cannot selectively transmit only the signal to be transmitted.
- a configuration that can solve this problem is the configuration of the frequency offset applying unit 332 — m shown in FIG.
- the frequency offset adding unit 332 — m includes a local oscillator 3321 — m, a local oscillator 3322 — m, a frequency converter 3323 — m, a frequency converter 3324 — m, a band limiting filter 3325 — m, and a band limiting filter 3326 — m. Consists of.
- Local oscillator 3321_m and local oscillator 3322_m generate carrier signals of frequency ⁇ fc + fi + m ⁇ fs and frequency fi, respectively. That is, the local oscillator 3321_m and the local oscillator 3322_m generate carrier signals having slightly different frequencies.
- the frequency fi is an arbitrary frequency, and the difference in frequency between the two carrier signals is ( ⁇ fc + m ⁇ fs).
- Local oscillator 3321_m and local oscillator 3322_m output the generated carrier signal to frequency converter 3323_m and frequency converter 3324_m, respectively.
- the frequency converter 3323_m and the frequency converter 3324_m accept input of carrier signals output from the local oscillator 3321_m and the local oscillator 3322_m, respectively. Each of the frequency converter 3323_m and the frequency converter 3324_m performs frequency conversion by using the input carrier signal.
- the frequency converter 3323_m and the frequency converter 3324_m output the generated signals to the band limiting filter 3325_m and the band limiting filter 3326_m, respectively.
- the band limiting filter 3325_m and the band limiting filter 3326_m accept the input of the signals output from the frequency converter 3323_m and the frequency converter 3324_m, respectively.
- the band limiting filter 3325_m and the band limiting filter 3326_m suppress the carrier leak (local leak) and the image leak (image signal) that are generated by frequency conversion, and offset the input signal. Only a desired signal is selectively transmitted.
- the frequency offset assigning unit 332 — m converts the frequency once to a frequency higher than the transmission frequency and then returns to the transmission frequency. By performing the frequency conversion twice, carrier leak and image leak appear at a frequency away from the center frequency of the analog signal S32.
- the frequency offset assigning unit 332_m even if ⁇ fc is a very small value or zero, it is easy to selectively transmit only the signal to be transmitted by the band limiting filter. As a result, it is possible to suppress local leaks and image signals that are generated as secondary effects.
- FIGS. 8 and 9 are block diagrams respectively showing a frequency offset applying unit 333_m and a frequency offset applying unit 334_m as third and fourth configuration examples of the frequency offset applying unit using the variable phase shifter.
- the frequency offset assigning unit 333_m includes a control unit 3331_m and a variable phase shifter 3332_m.
- the control unit 3331 — m performs control such that the phase linearly changes 360 degrees in 1 / (m ⁇ fs) seconds with respect to the variable phase shifter 3332 — m. That is, the variable phase shifter 3332 — m adaptively changes the phase. In other words, the variable phase shifter 3332 — m gives a linear phase change of m ⁇ 360 degrees per symbol to the analog signal S32 according to the control of the control unit 3331 — m.
- variable phase shifter 3332 — m not only the phase but also the amplitude may change secondary. As a result, there is a possibility that signal quality deterioration such as an increase in the bandwidth of the transmission signal accompanying amplitude variation may occur.
- a configuration that can solve this problem is the configuration of the frequency offset assigning unit 334_m shown in FIG.
- the frequency offset adding unit 334_m includes a control unit 3341_m, a variable phase shifter 3342_m, and a variable attenuator 3343_m.
- the control unit 3341_m controls the attenuation rate of the variable attenuator 3343_m based on the phase characteristic of the variable phase shifter 3342_m.
- the phase characteristic is given, for example, as a correspondence between the phase given by the variable phase shifter 3342 — m and the increase / decrease rate of amplitude.
- the control unit 3341_m determines the attenuation rate of the variable attenuator 3343_m based on the phase characteristics, and performs control to cancel the amplitude fluctuation of the variable phase shifter 3342_m by the variable attenuator 3343_m. Thereby, the frequency offset provision part 334_m can avoid the quality degradation of the transmission signal accompanying an amplitude fluctuation
- FIG. 10 is a block diagram showing the configuration of the transmission device 4 according to the third embodiment of the present invention.
- the transmission apparatus 4 includes a modulation unit 41, M delay units 42 (42-1, 42-2,..., 42-M), and M radio units 43 (43 -1, 43-2,..., 43-M).
- the radio unit 43 (43-1, 43-2,..., 43-M) is connected to each of the M transmission antennas 44 (44-1, 44-2,..., 44-M). doing.
- the modulation unit 41 performs chirp spreading modulation on the input information sequence S40.
- Modulation section 11 outputs symbol series S41, which is a symbol series obtained by spreading and modulating information series S40, to delay sections 42 (42-1, 42-2,..., 42-M), respectively. .
- the delay unit 42 (42-1, 42-2,..., 42-M) acquires the symbol series S41 output from the modulation unit 41, respectively.
- the delay units 42 (42-1, 42-2,..., 42-M) respectively add time delays to the acquired symbol series S41.
- the time delays given to the symbol series S41 by the delay unit 42 are different from each other.
- M symbol sequences S42 (S42-1, S42-2,..., S42-M) are generated.
- the delay unit 42 (42-1, 42-2,..., 42-M) converts the generated symbol sequence S42 (S42-1, S42-2,..., S42-M) into the radio unit 43. (43-1, 43-2,..., 43-M).
- the radio unit 43 receives the symbol sequence S42 (42) output from the delay unit 42 (42-1, 42-2,..., 42-M). S42-1, S42-2,..., S42-M) are acquired.
- the radio unit 43 (43-1, 43-2,..., 43-M) performs analog conversion on the acquired symbol sequence S42 (S42-1, S42-2,..., S42-M). And frequency conversion respectively.
- the symbol series S42 (S42-1, S42-2,..., S42-M) is converted into a transmission signal S43 (S43-1, S43-2,..., S43-M).
- the radio unit 43 (43-1, 43-2,..., 43-M) transmits the converted transmission signal S43 (S43-1, S43-2,..., S43-M) to the transmission antenna 44. (S44-1, S44-2,..., S44-M) are transmitted to the receiving apparatus 2.
- the delay unit 42 (42-1, 42-2,..., 42-M) has a difference between all delay times assigned to the symbol sequence S41 as an integral multiple of the reciprocal of the bandwidth of the modulation signal. A delay is added to the symbol sequence S41 so that Note that the lengths of the delays given to the symbol series S41 by the delay unit 42 are different from each other.
- chirp spread modulation that linearly changes the frequency.
- spread modulation is performed by sweeping the frequency of a signal linearly within one symbol. Therefore, the delay unit 42 delays the symbol sequence S41, so that the same effect as the frequency offset can be obtained.
- FIG. 11 is a diagram showing the relationship between frequency and time in chirp spread modulation.
- the modulation bandwidth of the symbol sequence S41 is Bw
- the time delay of 1 / Bw is equivalent to the frequency offset of fs.
- the transmission device 4 according to the third embodiment uses this feature of chirp spreading modulation to realize the same effect as the addition of a frequency offset by providing a time delay instead of providing a frequency offset.
- the transmission device 4 is, for example, a transmission device that transmits a radio signal subjected to chirp spread modulation whose frequency changes linearly with time.
- the transmission device 4 includes a modulation unit 41 that performs spread modulation on an input information sequence. Further, the transmission device 4 is configured such that, for each of the M modulation signals obtained by branching the modulation signal generated by the modulation unit 41, the difference between all delay times added to the modulation signal is the modulation signal.
- the transmission device 4 also includes a radio unit 43 that transmits M modulated signals to which a delay is given by the delay unit 42 through a plurality of transmission antennas.
- the receiving side does not use an interleaver or an error correction code.
- the diversity effect can be obtained by using a general receiver that does not assume application of frequency offset diversity.
- FIG. 12 is a block diagram showing a configuration of the transmission device 5 according to the fourth embodiment of the present invention.
- the transmission device 5 includes a modulation unit 51, a radio unit 52, and M delay units 53 (53-1, 53-2,..., 53-M). Yes.
- the delay units 53 (53-1, 53-2,..., 53-M) are connected to M transmission antennas 54 (54-1, 54-2,..., 54-M), respectively. doing.
- the modulation unit 51 performs chirp spread modulation on the input information sequence S50.
- Modulation section 51 outputs symbol series S51, which is a symbol series obtained by spreading and modulating information series S50, to radio section 52.
- the radio unit 52 acquires the symbol series S51 output from the modulation unit 51.
- the radio unit 52 performs analog conversion and frequency conversion on the acquired symbol series S51. Thereby, the symbol series S51 is converted into an analog signal S52.
- the wireless unit 52 outputs the converted analog signal S52 to the delay units 53 (53-1, 53-2,..., 53-M).
- Delay unit 53 acquires analog signal S52 output from radio unit 52.
- the delay units 53 add delays to the acquired analog signal S52.
- the delays given to the analog signal S52 by the delay unit 53 are different from each other.
- M transmission signals S53 S53-1, S53-2,..., S53-M
- the delay unit 53 converts the generated transmission signal S53 (S53-1, S53-2,..., S53-M) into M pieces of signals.
- the signals are transmitted to the receiving device 2 through the transmitting antennas 54 (54-1, 54-2,..., 54-M).
- the delay unit 53 (53-1, 53-2,..., 53-M) is such that the difference between all delay times given to the analog signal S52 is an integral multiple of the reciprocal of the bandwidth of the modulation signal. Thus, a delay is added to the analog signal S52.
- the transmission device 4 according to the third embodiment described above is configured to add a time delay to the digital signal indicating the symbol sequence S41, whereas the transmission device 5 according to the fourth embodiment uses the analog signal S52. In contrast, a time delay is provided. With this configuration, the radio units 52 can be combined into one. Thereby, the transmission device 5 according to the fourth embodiment can achieve further cost reduction as compared with the transmission device 4 according to the third embodiment.
- the conventional wireless communication system has a problem that a special receiving device that assumes application of transmission diversity must be used.
- the special receiving apparatus is, for example, a receiving apparatus provided with one or both of a deinterleaver and error correction code decoding means.
- the radio communication system is characterized by appropriately giving a frequency offset or appropriately giving a delay to a signal to be transmitted so as to be a multipath capable of obtaining a diversity gain.
- a frequency offset is given so as to be arranged at equal intervals with “fs” obtained as the reciprocal of the symbol interval, or the reciprocal of the modulation bandwidth.
- a receiving apparatus compensates for a variation in reception level in one symbol period. Since the signals to which the frequency offset or delay is added are orthogonal to each other, it is possible to compensate for fluctuations in the reception level without causing interference between the signals.
- the present invention it is possible to obtain a transmission diversity effect using a general receiving apparatus that does not use an interleaver or an error correction code and does not assume application of frequency offset diversity.
- the configuration in which the receiving device 2 includes one receiving antenna 21 has been described in the embodiment, the configuration is not limited thereto.
- the receiving device 2 may include two or more receiving antennas 21.
- the reception device 2 may receive a signal transmitted from the transmission device 1 by applying a known reception diversity method.
- the present invention is not limited to this.
- the transmission apparatus may include one delay unit that gives different delays to a plurality of symbol sequences or analog signals.
- the transmission apparatus may include one frequency offset assigning unit that assigns different frequency offsets to a plurality of symbol sequences or analog signals instead of the plurality of frequency offset assigning units.
- a program for realizing this control function is recorded on a computer-readable recording medium, the program recorded on this recording medium is read into a computer system, and the operation of each function is executed by a processor.
- the “computer system” is a computer system built in the transmission device, and includes an OS and hardware such as peripheral devices.
- the “computer-readable recording medium” refers to a storage device such as a flexible medium, a magneto-optical disk, a portable medium such as a ROM or a CD-ROM, and a hard disk incorporated in a computer system.
- the “computer-readable recording medium” is a medium that dynamically holds a program for a short time, such as a communication line when transmitting a program via a network such as the Internet or a communication line such as a telephone line,
- a volatile memory inside a computer system that serves as a server or a client may be included that holds a program for a certain period of time.
- the program may be a program for realizing a part of the functions described above, and may be a program capable of realizing the functions described above in combination with a program already recorded in a computer system.
- a part or all of the transmission apparatus in the above-described embodiment may be realized as an integrated circuit such as an LSI (Large Scale Integration circuit).
- LSI Large Scale Integration circuit
- Each functional block of the transmission apparatus may be individually made into a processor, or a part or all of them may be integrated into a processor.
- the method of circuit integration is not limited to LSI, and may be realized by a dedicated circuit or a general-purpose processor.
- an integrated circuit based on the technology may be used.
- the present invention can obtain the effect of transmission diversity even in wireless communication with a general receiving apparatus, and can be applied to various wireless communication.
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Radio Transmission System (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
Abstract
Description
本願は、2018年2月1日に、日本に出願された特願2018-016635号に基づき優先権を主張し、その内容をここに援用する。
このように、従来技術においては、送信ダイバーシチの適用を想定した特別な受信装置を用いる必要があった。
本発明の第2の態様によれば、第1の態様の送信装置において、前記遅延部は、前記複数の変調信号を示すデジタル信号に前記遅延を付与する。
本発明の第3の態様によれば、第1の態様の送信装置において、前記遅延部は、前記複数の変調信号を示すアナログ信号に前記遅延を付与する。
本発明の第5の態様の送信方法は、送信装置による送信方法であって、入力される情報系列をチャープ拡散変調して変調信号を生成する変調ステップと、前記変調ステップによって生成された前記変調信号が複製されることで得られる複数の変調信号のそれぞれに対して、長さが互いに異なる遅延であって遅延同士の差が前記変調信号の帯域幅の逆数の整数倍となる遅延を付与する遅延ステップと、前記遅延ステップによって前記遅延が付与された前記複数の変調信号それぞれを複数の送信アンテナから送信する送信ステップと、を有する。
本発明の第7の態様によれば、第6の態様の送信装置において、前記周波数オフセット付与部は、前記複数の変調信号ごとに、キャリア信号を発生させる局部発振器と、前記変調信号に対して前記キャリア信号を利用して周波数変換を行う周波数変換器と、前記周波数変換によって発生するキャリアリークやイメージリークを抑圧する帯域制限フィルタと、を備える。
以下、本発明の第1実施形態について説明する。
以下、第1実施形態に係る送信装置1の構成について、図面を参照しながら説明する。
図1は、本発明の第1実施形態に係る送信装置1の構成を示すブロック図である。図1に示すように、送信装置1は、変調部11と、M個の周波数オフセット付与部12(12-1、12-2、・・・、12-M)と、M個の無線部13(13-1、13-2、・・・、13-M)と、を備えている。また、M個の無線部13(無線部13-1~13-M)は、M個の送信アンテナ14(14-1、14-2、・・・、14-M)とそれぞれ接続している。
以下、受信装置2の構成について、図面を参照しながら説明する。
図2は、デジタル無線通信において一般的な受信装置2の構成を示すブロック図である。図2に示すように、受信装置2は、無線部22と、復調部23と、を備えている。また、無線部22は、受信アンテナ21と接続している。
以下、周波数オフセット付与部12(12-1、12-2、・・・、12-M)の動作について説明する。周波数オフセット付与部12(12-1、12-2、・・・、12-M)は、シンボル系列S11に付与する全ての周波数オフセット同士の差が、シンボル速度fsの整数倍となるように、周波数オフセットをシンボル系列S11に付与する。シンボル速度fsは、シンボル系列S11に含まれる隣接するシンボル間の時間間隔の逆数である。
前述したように、受信装置2に備えられる復調部23は、伝送路で無線信号に生じる周波数、振幅および位相それぞれの変動を補償する適応等化機能を備える。復調部23は、この適応等化機能により、デジタル信号S22に含まれる上述の変動を補償するとともに、送信装置1においてシンボル系列S11に付与された周波数オフセットをキャンセルする。伝送路で生じた周波数の変動と、送信装置1において付与された周波数オフセットとは、適応等化において同様に扱われるためである。すなわち、無線通信システムの受信装置2は、従来の送信ダイバーシチ方式において必要とされていたデインタリーバ又は誤り訂正符号の復号器を備えずとも、最大比合成ダイバーシチ効果と同様の送信ダイバーシチ効果を得ることができる。復調部23が備える機能は一般の受信装置も有している機能である。したがって、既存の送信ダイバーシチ方式に適していない受信装置であっても送信装置1を用いることで送信ダイバーシチ効果を得ることができる。
以下、第1実施形態に係る送信装置1の動作の一例について、図面を参照しながら説明する。
図4は、本発明の第1実施形態に係る送信装置1の動作を示すフローチャートである。本フローチャートは、変調部11へ情報系列S10の入力が行われる際に開始する。
以上で図4に示すフローチャートの処理が終了する。
以下、本発明の第2実施形態について説明する。
以下、第2実施形態に係る送信装置3の構成について、図面を参照しながら説明する。
図5は、本発明の第2実施形態に係る送信装置3の構成を示すブロック図である。図5に示すように、送信装置3は、変調部31と、無線部32と、M個の周波数オフセット付与部33(33-1、33-2、・・・、33-M)と、を備えている。また、周波数オフセット付与部33(33-1、33-2、・・・、33-M)は、M個の送信アンテナ34(34-1、34-2、・・・、34-M)とそれぞれ接続している。
図6および図7は、周波数変換器を用いた周波数オフセット付与部の第1および第2の構成例としての周波数オフセット付与部331_mおよび周波数オフセット付与部332_mをそれぞれ示すブロック図である。
図6に示すように、周波数オフセット付与部331_mは、局部発振器3311_mと、周波数変換器3312_mと、帯域制限フィルタ3313_mと、を含んで構成される。
図8および図9は、可変位相器を用いた周波数オフセット付与部の第3および第4の構成例としての周波数オフセット付与部333_mおよび周波数オフセット付与部334_mをそれぞれ示すブロック図である。
図8に示すように、周波数オフセット付与部333_mは、制御部3331_mと、可変位相器3332_mと、を含んで構成される。
以下、本発明の第3実施形態について説明する。
以下、第3実施形態に係る送信装置4の構成について、図面を参照しながら説明する。
図10は、本発明の第3実施形態に係る送信装置4の構成を示すブロック図である。図10に示すように、送信装置4は、変調部41と、M個の遅延部42(42-1、42-2、・・・、42-M)と、M個の無線部43(43-1、43-2、・・・、43-M)と、を備えている。また、無線部43(43-1、43-2、・・・、43-M)は、M個の送信アンテナ44(44-1、44-2、・・・、44-M)とそれぞれ接続している。
以下、本発明の第4実施形態について説明する。
以下、第4実施形態に係る送信装置5の構成について、図面を参照しながら説明する。
図12は、本発明の第4実施形態に係る送信装置5の構成を示すブロック図である。図12に示すように、送信装置5は、変調部51と、無線部52と、M個の遅延部53(53-1、53-2、・・・、53-M)と、を備えている。また、遅延部53(53-1、53-2、・・・、53-M)は、M個の送信アンテナ54(54-1、54-2、・・・、54-M)とそれぞれ接続している。
これにより、本発明によれば、インタリーバや誤り訂正符号を用いず、周波数オフセットダイバーシチの適用を想定していない一般的な受信装置を用いて、送信ダイバーシチ効果を得ることが可能となる。
なお、受信装置2が1つの受信アンテナ21を備える構成を実施形態において説明したが、これに限定されない。受信装置2は2つ以上の受信アンテナ21を備えてもよい。受信装置2が複数の受信アンテナ21を備える場合、受信装置2は、公知の受信ダイバーシチ方式を適用して送信装置1から送信される信号を受信してもよい。
また、送信装置が複数の遅延部を備える構成を実施形態において説明したが、これに限定されない。送信装置は、複数のシンボル系列又はアナログ信号に対して互いに異なる遅延を付与する1つの遅延部を備えてもよい。同様に、送信装置は、複数の周波数オフセット付与部に代えて、複数のシンボル系列又はアナログ信号に対して互いに異なる周波数オフセットを付与する1つの周波数オフセット付与部を備えてもよい。
なお、ここでいう「コンピュータシステム」とは、送信装置に内蔵されたコンピュータシステムであって、OSや周辺機器等のハードウェアを含むものとする。また、「コンピュータ読み取り可能な記録媒体」とは、フレキシブルディスク、光磁気ディスク、ROM、CD-ROM等の可搬媒体、コンピュータシステムに内蔵されるハードディスク等の記憶装置のことをいう。
Claims (12)
- 入力される情報系列をチャープ拡散変調して変調信号を生成する変調部と、
前記変調部によって生成された前記変調信号が複製されることで得られる複数の変調信号のそれぞれに対して、長さが互いに異なる遅延であって遅延同士の差が前記変調信号の帯域幅の逆数の整数倍となる遅延を付与する遅延部と、
前記遅延部によって前記遅延が付与された前記複数の変調信号それぞれを送信する複数の送信アンテナと、
を備える送信装置。 - 前記遅延部は、前記複数の変調信号を示すデジタル信号に前記遅延を付与する、
請求項1に記載の送信装置。 - 前記遅延部は、前記複数の変調信号を示すアナログ信号に前記遅延を付与する、
請求項1に記載の送信装置。 - 送信装置と受信装置とを有する無線通信システムであって、
前記送信装置は、
入力される情報系列をチャープ拡散変調して変調信号を生成する変調部と、
前記変調部によって生成された前記変調信号が複製されることで得られる複数の変調信号のそれぞれに対して、長さが互いに異なる遅延であって遅延同士の差が前記変調信号の帯域幅の逆数の整数倍となる遅延を付与する遅延部と、
前記遅延部により前記遅延が付与された前記複数の変調信号それぞれを送信する複数の送信アンテナと、
を備え、
前記受信装置は、
前記送信装置の前記複数の送信アンテナから送信された前記複数の変調信号を受信して受信信号を取得する受信アンテナと、
前記受信アンテナによって取得された前記受信信号に対して、周波数変換およびアナログ-デジタル変換を行い、変換によりデジタル信号を生成する受信部と、
前記受信部によって生成された前記デジタル信号を復調する復調部と、
を備える、
無線通信システム。 - 送信装置による送信方法であって、
入力される情報系列をチャープ拡散変調して変調信号を生成する変調ステップと、
前記変調ステップによって生成された前記変調信号が複製されることで得られる複数の変調信号のそれぞれに対して、長さが互いに異なる遅延であって遅延同士の差が前記変調信号の帯域幅の逆数の整数倍となる遅延を付与する遅延ステップと、
前記遅延ステップによって前記遅延が付与された前記複数の変調信号それぞれを複数の送信アンテナから送信する送信ステップと、
を有する送信方法。 - 入力される情報系列を拡散変調して変調信号を生成する変調部と、
前記変調部によって生成された前記変調信号が複製されることで得られる複数の変調信号のそれぞれに対して、互いに異なる周波数オフセットであって周波数オフセット同士の差がシンボル速度の整数倍となる周波数オフセットを付与する周波数オフセット付与部と、
前記周波数オフセット付与部によって前記周波数オフセットが付与された前記複数の変調信号それぞれを送信する複数の送信アンテナと、
を備える送信装置。 - 前記周波数オフセット付与部は、前記複数の変調信号ごとに、
キャリア信号を発生させる局部発振器と、
前記変調信号に対して前記キャリア信号を利用して周波数変換を行う周波数変換器と、
前記周波数変換によって発生するキャリアリークやイメージリークを抑圧する帯域制限フィルタと、
を備える請求項6に記載の送信装置。 - 前記周波数オフセット付与部は、前記複数の変調信号ごとに、
互いに異なる周波数を有する第1および第2のキャリア信号を発生させる局部発振器と、
前記第1のキャリア信号を利用して前記変調信号に対する周波数変換を行う第1の周波数変換器と、
前記第1の周波数変換器による前記周波数変換によって発生するキャリアリークやイメージリークを抑圧する第1の帯域制限フィルタと、
前記第2のキャリア信号を利用して、前記第1の帯域制限フィルタが出力する信号に対する周波数変換を行う第2の周波数変換器と、
前記第2の周波数変換器による前記周波数変換によって発生するキャリアリークやイメージリークを抑圧する第2の帯域制限フィルタと、
を備える請求項6に記載の送信装置。 - 前記周波数オフセット付与部は、前記複数の変調信号ごとに、
適応的に前記変調信号の位相を変化させる可変位相器と、
前記可変位相器を制御する制御部と、
を備える請求項6に記載の送信装置。 - 前記周波数オフセット付与部は、前記複数の変調信号ごとに、
前記制御部による制御に応じて、前記可変位相器によって位相が変化した前記変調信号の振幅を減衰させる可変減衰器
をさらに備える請求項9に記載の送信装置。 - 送信装置と受信装置とを有する無線通信システムであって、
前記送信装置は、
入力される情報系列を拡散変調して変調信号を生成する変調部と、
前記変調部によって生成された前記変調信号が複製されることで得られる複数の変調信号のそれぞれに対して、互いに異なる周波数オフセットであって周波数オフセット同士の差がシンボル速度の整数倍となる周波数オフセットを付与する周波数オフセット付与部と、
前記周波数オフセット付与部によって前記周波数オフセットが付与された前記複数の変調信号それぞれを送信する複数の送信アンテナと
を備え、
前記受信装置は、
前記送信装置の前記複数の送信アンテナから送信された前記複数の変調信号を受信して受信信号を取得する受信アンテナと、
前記受信アンテナによって取得された前記受信信号に対して、周波数変換およびアナログ-デジタル変換を行い、変換によってデジタル信号を生成する受信部と、
前記受信部によって生成された前記デジタル信号を復調する復調部と、
を備える無線通信システム。 - 送信装置による送信方法であって、
入力される情報系列を拡散変調して変調信号を生成する変調ステップと、
前記変調ステップによって生成された前記変調信号が複製されることで得られる複数の変調信号のそれぞれに対して、互いに異なる周波数オフセットであって周波数オフセット同士の差がシンボル速度の整数倍となる周波数オフセットを付与する周波数オフセット付与ステップと、
前記周波数オフセット付与ステップによって前記周波数オフセットが付与された前記複数の変調信号それぞれを複数の送信アンテナから送信する送信ステップと、
を有する送信方法。
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US16/965,959 US11411633B2 (en) | 2018-02-01 | 2019-02-01 | Transmission device, wireless communication system, and transmission method |
CA3089696A CA3089696C (en) | 2018-02-01 | 2019-02-01 | Transmission device, wireless communication system, and transmission method |
KR1020207021312A KR102380393B1 (ko) | 2018-02-01 | 2019-02-01 | 송신 장치, 무선 통신 시스템 및 송신 방법 |
EP19748012.2A EP3731432B1 (en) | 2018-02-01 | 2019-02-01 | Transmission device, wireless communication system, and transmission method |
JP2019569609A JP6920626B2 (ja) | 2018-02-01 | 2019-02-01 | 送信装置、無線通信システムおよび送信方法 |
CN201980010887.3A CN111886811B (zh) | 2018-02-01 | 2019-02-01 | 发送装置、无线通信系统和发送方法 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2018016635 | 2018-02-01 | ||
JP2018-016635 | 2018-02-01 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2019151480A1 true WO2019151480A1 (ja) | 2019-08-08 |
Family
ID=67478871
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2019/003625 WO2019151480A1 (ja) | 2018-02-01 | 2019-02-01 | 送信装置、無線通信システムおよび送信方法 |
Country Status (7)
Country | Link |
---|---|
US (1) | US11411633B2 (ja) |
EP (1) | EP3731432B1 (ja) |
JP (1) | JP6920626B2 (ja) |
KR (1) | KR102380393B1 (ja) |
CN (1) | CN111886811B (ja) |
CA (1) | CA3089696C (ja) |
WO (1) | WO2019151480A1 (ja) |
Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH03135238A (ja) | 1989-10-20 | 1991-06-10 | Nippon Telegr & Teleph Corp <Ntt> | 誤り訂正符号データの送信方法及び受信方法 |
JPH06318923A (ja) * | 1993-02-26 | 1994-11-15 | Nippon Telegr & Teleph Corp <Ntt> | 一括変調器 |
JP2000151465A (ja) * | 1998-11-11 | 2000-05-30 | Matsushita Electric Ind Co Ltd | 無線通信装置及び無線通信方法 |
JP2001036442A (ja) * | 1999-07-15 | 2001-02-09 | Toshiba Corp | 無線通信システム、無線送信装置および無線受信装置 |
JP2003264470A (ja) * | 2002-03-08 | 2003-09-19 | Communication Research Laboratory | 無線通信システム及び、無線送信機 |
JP2007325079A (ja) | 2006-06-02 | 2007-12-13 | Nippon Telegr & Teleph Corp <Ntt> | 無線通信システム、及び通信方法、並びに送信装置、及び送信方法 |
JP2008060685A (ja) * | 2006-08-29 | 2008-03-13 | Fujitsu Ltd | 自動周波数制御装置 |
JP2008153762A (ja) | 2006-12-14 | 2008-07-03 | Nippon Telegr & Teleph Corp <Ntt> | 無線通信システムおよび送信装置 |
WO2011108103A1 (ja) * | 2010-03-04 | 2011-09-09 | 三菱電機株式会社 | 送信モジュールおよびフェーズドアレイアンテナ装置 |
JP2018016635A (ja) | 2012-11-19 | 2018-02-01 | 児玉 剛之 | 口腔用組成物 |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE69433255T2 (de) | 1993-02-26 | 2004-04-29 | Nippon Telegraph And Telephone Corp. | Gruppen modulator |
JPH09116475A (ja) * | 1995-10-23 | 1997-05-02 | Nec Corp | 時間ダイバーシチ送受信システム |
JP2001177503A (ja) * | 1999-12-16 | 2001-06-29 | Kddi Corp | スペクトラム拡散通信方法 |
JP2001257660A (ja) * | 2000-03-14 | 2001-09-21 | Matsushita Electric Ind Co Ltd | 送信装置と受信装置及び送受信方法 |
US6515622B1 (en) * | 2000-06-13 | 2003-02-04 | Hrl Laboratories, Llc | Ultra-wideband pulse coincidence beamformer |
US6937108B2 (en) | 2003-03-11 | 2005-08-30 | M/A-Com, Inc. | Methods and apparatus for offset chirp modulation |
JP3987026B2 (ja) * | 2003-12-04 | 2007-10-03 | 三菱電機株式会社 | スペクトル拡散通信装置 |
WO2006130988A1 (en) * | 2005-06-10 | 2006-12-14 | Telecommunications Research Laboratories | Wireless communication system |
CN102007700B (zh) | 2008-04-21 | 2013-12-11 | 日本电信电话株式会社 | 无线电通信系统、发送装置、接收装置、无线电通信方法、发送方法、接收方法 |
KR101320779B1 (ko) * | 2008-11-25 | 2013-11-07 | 한국전자통신연구원 | 다중 안테나 통신 시스템의 신호 송수신 장치 및 방법 |
DE102015122420A1 (de) * | 2015-12-21 | 2017-06-22 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Sendeanordnung zum Erzeugen eines für eine Lokalisierung geeigneten Signalmusters und Empfangsanordnung zum Durchführen einer Lokalisierung |
-
2019
- 2019-02-01 EP EP19748012.2A patent/EP3731432B1/en active Active
- 2019-02-01 WO PCT/JP2019/003625 patent/WO2019151480A1/ja unknown
- 2019-02-01 KR KR1020207021312A patent/KR102380393B1/ko active IP Right Grant
- 2019-02-01 CN CN201980010887.3A patent/CN111886811B/zh active Active
- 2019-02-01 CA CA3089696A patent/CA3089696C/en active Active
- 2019-02-01 JP JP2019569609A patent/JP6920626B2/ja active Active
- 2019-02-01 US US16/965,959 patent/US11411633B2/en active Active
Patent Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH03135238A (ja) | 1989-10-20 | 1991-06-10 | Nippon Telegr & Teleph Corp <Ntt> | 誤り訂正符号データの送信方法及び受信方法 |
JPH06318923A (ja) * | 1993-02-26 | 1994-11-15 | Nippon Telegr & Teleph Corp <Ntt> | 一括変調器 |
JP2000151465A (ja) * | 1998-11-11 | 2000-05-30 | Matsushita Electric Ind Co Ltd | 無線通信装置及び無線通信方法 |
JP2001036442A (ja) * | 1999-07-15 | 2001-02-09 | Toshiba Corp | 無線通信システム、無線送信装置および無線受信装置 |
JP2003264470A (ja) * | 2002-03-08 | 2003-09-19 | Communication Research Laboratory | 無線通信システム及び、無線送信機 |
JP2007325079A (ja) | 2006-06-02 | 2007-12-13 | Nippon Telegr & Teleph Corp <Ntt> | 無線通信システム、及び通信方法、並びに送信装置、及び送信方法 |
JP2008060685A (ja) * | 2006-08-29 | 2008-03-13 | Fujitsu Ltd | 自動周波数制御装置 |
JP2008153762A (ja) | 2006-12-14 | 2008-07-03 | Nippon Telegr & Teleph Corp <Ntt> | 無線通信システムおよび送信装置 |
WO2011108103A1 (ja) * | 2010-03-04 | 2011-09-09 | 三菱電機株式会社 | 送信モジュールおよびフェーズドアレイアンテナ装置 |
JP2018016635A (ja) | 2012-11-19 | 2018-02-01 | 児玉 剛之 | 口腔用組成物 |
Non-Patent Citations (1)
Title |
---|
FUJINO , YOSUKE ET AL.: "B-5-127 A Low Complexity Frequency Offset Transmitter Diversity Scheme for Wide Area Ubiquitous Network", PROCEEDINGS OF THE 2007 IEICE SOCIETY CONFERENCE, no. 1, 29 August 2007 (2007-08-29), JP, pages 449, XP009522072, ISSN: 1349-144X * |
Also Published As
Publication number | Publication date |
---|---|
EP3731432A4 (en) | 2021-09-22 |
KR20200102472A (ko) | 2020-08-31 |
JP6920626B2 (ja) | 2021-08-18 |
JPWO2019151480A1 (ja) | 2020-09-17 |
CA3089696A1 (en) | 2019-08-08 |
CN111886811A (zh) | 2020-11-03 |
EP3731432B1 (en) | 2022-12-14 |
US11411633B2 (en) | 2022-08-09 |
US20210119685A1 (en) | 2021-04-22 |
CN111886811B (zh) | 2023-05-23 |
KR102380393B1 (ko) | 2022-04-01 |
CA3089696C (en) | 2023-08-22 |
EP3731432A1 (en) | 2020-10-28 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US7227906B2 (en) | Radio communication method and apparatus for multiplex transmission of plural signals in the same frequency band | |
US9231715B2 (en) | I/Q mismatch compensation method and apparatus | |
US6249250B1 (en) | Adaptive variable directional antenna | |
US6980778B2 (en) | Split shift phase sweep transmit diversity | |
EP1282244A1 (en) | Symmetric sweep phase sweep transmit diversity | |
EP1949558B1 (en) | Method and system for multiple antenna communications, related apparatus and corresponding computer program product | |
US7110432B2 (en) | Orthogonal chirp modulation in multipath environments | |
JPH11205273A (ja) | Ofdmダイバーシチ受信装置 | |
Singh et al. | Millimeter-wave full duplex radios | |
CN101351978A (zh) | 用于无线通信系统的天线阵校准 | |
CN101124732A (zh) | 智能天线系统中的发射/接收补偿 | |
KR100438240B1 (ko) | 데이터 전송 장치 및 데이터 전송 방법 | |
WO2019151480A1 (ja) | 送信装置、無線通信システムおよび送信方法 | |
US8270533B2 (en) | Transmitter/receiver and data transmission/reception method in communication system | |
US9954574B2 (en) | Spreading sequence system for full connectivity relay network | |
JP6336229B2 (ja) | 無線通信装置および送信ストリーム数決定方法 | |
JP6388344B2 (ja) | 無線通信システム | |
KR20230043031A (ko) | 듀얼 포트 송신들에서 코딩된 신호들을 상관해제하기 위한 시스템들 및 방법들 | |
JP2006060572A (ja) | 送信装置,受信装置,および通信システム | |
JP2011259141A (ja) | 伝送システム、送信装置、受信装置、伝送方法及びプログラム | |
US20140341321A1 (en) | Transmitter and transmission method thereof | |
JPH0818877A (ja) | 映像信号送受信端末装置及び映像信号伝送装置 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 19748012 Country of ref document: EP Kind code of ref document: A1 |
|
ENP | Entry into the national phase |
Ref document number: 2019569609 Country of ref document: JP Kind code of ref document: A |
|
ENP | Entry into the national phase |
Ref document number: 20207021312 Country of ref document: KR Kind code of ref document: A |
|
ENP | Entry into the national phase |
Ref document number: 3089696 Country of ref document: CA |
|
ENP | Entry into the national phase |
Ref document number: 2019748012 Country of ref document: EP Effective date: 20200724 |
|
NENP | Non-entry into the national phase |
Ref country code: DE |