WO2003081805A1 - Emetteur/recepteur a antenne multi-faisceaux, procede d'emission/reception et procede de selection de faisceau d'emission - Google Patents
Emetteur/recepteur a antenne multi-faisceaux, procede d'emission/reception et procede de selection de faisceau d'emission Download PDFInfo
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- WO2003081805A1 WO2003081805A1 PCT/JP2003/001791 JP0301791W WO03081805A1 WO 2003081805 A1 WO2003081805 A1 WO 2003081805A1 JP 0301791 W JP0301791 W JP 0301791W WO 03081805 A1 WO03081805 A1 WO 03081805A1
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- reception
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- user
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- path delay
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- 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
- H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
- H04B7/0891—Space-time diversity
- H04B7/0897—Space-time diversity using beamforming per multi-path, e.g. to cope with different directions of arrival [DOA] at different multi-paths
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
- H01Q3/26—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture
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- 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
- H04B7/0408—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas using two or more beams, i.e. beam diversity
-
- 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
- H04B7/0617—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 for beam forming
-
- 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
- H04B7/0602—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 antenna switching
- H04B7/0608—Antenna selection according to transmission parameters
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- 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
- H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
- H04B7/0802—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection
- H04B7/0817—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection with multiple receivers and antenna path selection
- H04B7/082—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection with multiple receivers and antenna path selection selecting best antenna path
-
- 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
- H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
- H04B7/0868—Hybrid systems, i.e. switching and combining
- H04B7/088—Hybrid systems, i.e. switching and combining using beam selection
Definitions
- Multi-beam antenna transmission / reception apparatus Description: Multi-beam antenna transmission / reception apparatus, transmission / reception method, and transmission beam selection method
- the present invention relates to an array antenna transmitting / receiving apparatus that suppresses other-user interference by controlling antenna directivity, and more particularly to a multi-beam antenna transmitting / receiving apparatus, a transmitting / receiving method, and a transmitting / receiving method for selecting transmitting / receiving directivity from a plurality of fixed directivity patterns (multi-beams). The method of selecting the game.
- the transmission / reception gain is increased in the desired signal direction.
- a method of forming a directional pattern (beam) that reduces the transmission / reception gain is being studied.
- the multi-beam method which selects transmission / reception beams from multiple fixed directivity patterns (multi-beams), is one such method.
- multi-beam antenna transmission / reception apparatus for example, as disclosed in “Multi-beam antenna system for wireless base station” (Japanese Patent Laid-Open No. 11-266282), a plurality of fixed receptions are performed at the time of reception. Selects a receive beam with a delay path with excellent reception quality from among the beams and performs reception.At the time of transmission, the path delay selected at the time of reception Z is the same as the set with excellent reception quality from the set of receive beam numbers. Select the transmit beam in the direction and transmit.
- FIG. 7 is a block diagram showing an example of a conventional multi-beam antenna transmitting / receiving apparatus.
- the conventional multi-beam antenna transceiver apparatus a receiving array antenna 2 0 1, receiving antenna elements 2 0 2, 2 0 2 corresponding to the N antenna 1 radio receiver 2 0 3, ⁇ ⁇ antenna N radio receiving sections 2 0 3 N , receive beam 1 forming section 204> to receive beam M forming section 204 M (also referred to as receive beam forming section 204), user 1 demodulation block 205 i to user L demodulation block 20 5 (also referred to as user demodulation block 205), user 1 modulation processing unit 2 11 1 user L modulation processing unit 2 1 1, and user 1 transmission beam Switching circuit 21 2, to user L transmission beam switching circuit 2 1 2, and transmission beam 1 forming section 2 13 i to transmission beam J forming section 21 3, and transmitting antenna elements 216 i to 216 ⁇
- the antenna 1 includes a wireless transmission unit 214, an antenna ⁇ a wireless transmission unit 2 14
- the receiving array antenna 201 is composed of ⁇ ⁇ receiving antenna elements 202 i to 202 N.
- the N receiving antenna elements 202 »to 202 N are arranged close so that the received signals of each antenna element have a correlation.
- the arrangement method include a circular arrangement and a linear arrangement at half wavelength intervals of the carrier wave.
- Each signal received by the N receiving antenna elements 202 i to 202 N includes a desired user signal component, a plurality of interference signal components, and thermal noise. Furthermore, a plurality of multipath components exist for each of the desired user signal component and the interference signal component. Usually, these signal components (a desired user signal component and an interference signal component) come from different directions. Therefore, there are multiple sets of the path delay of the desired user signal and the reception beam number (path delay Z reception beam number).
- Antenna 1 Wireless receiver 203, to Antenna N Wireless receiver 203 N is a low-noise amplifier, band-limiting filter, mixer, local oscillator, AGC (Au to Ga in
- the antenna 1 wireless receiving unit 203 receives the output of the receiving antenna element 202, amplifies the input signal, and adjusts the frequency from the wireless band to the base band. It performs reception processing such as conversion, quadrature detection, analog / digital conversion, etc., and outputs it to the receive beam 1 forming section 204 to the receive beam M forming section 204M.
- Receiving beam 1 forming section 204, to receiving beam M forming section 204 M receives the output of antenna 1 radio receiving section 203, to antenna N radio receiving section 203 N as input, and Then, a different fixed reception beam is formed for each reception beam forming unit, and is output to user 1 demodulation block 205 to user L demodulation block 205.
- the receiving beam 1 forming unit 204! ⁇ Reception beam M forming unit 2 0 4 M antenna 1 radio receiver 2 0 3 is in the subsequent stage of ⁇ ⁇ antenna N radio receiving sections 2 0 3 N, bi for the digital signal of the baseband - performing beam forming
- a beamforming method in a wireless band such as a noise matrix.
- the receive beam 1 forming section 204 to the receive beam M forming section 204 M are used for input signals containing all user signal (user 1 signal to user L signal) components and multipath components of user signals. Then, a different fixed reception beam is formed for each reception beam forming section 204, and the input signal is separated for each direction of arrival.
- User 1 demodulation block 2 05 i to user L demodulation block 205 includes reception beam 1 path detection unit 206, reception beam M path detection unit 206 M, and path delay reception beam selection unit 2 07, a transmission beam selection unit 209, and a demodulation processing unit 210.
- User 1 demodulation block 205 to user L demodulation block 205 outputs user 1 reception data to user L reception data (user reception data) corresponding to each user. Since the functions of the user demodulation block 205 are the same, a description will be given below using the user 1 demodulation block 205 as an example.
- the user 1 demodulation block 205 'receives the output of the reception beam 1 forming section 204, ..., the output of the reception beam M forming section 204M, and outputs the user 1 transmission beam number and the user 1 reception data.
- the reception beam 1 path detection unit 206 to the reception beam M path detection unit 206M receives the output of the reception beam 1 formation unit 204, to the reception beam M formation unit 204M as an input, Detects the path delay of the user signal in each input signal, measures the reception quality of the user signal at the detected path delay, and outputs it to the path delay / receive beam selector 207 I do.
- a user 1 signal to a user L signal are multiplexed on each input signal, and a multipath component of each user signal due to a propagation delay is multiplexed.
- the reception beam 1 path detection section 206 to the reception beam M path detection section 206 use only known symbols (such as pilot symbols) of the user signal, and perform path detection and reception quality of the user signal at the detected path delay. Can also be measured.
- the path delay reception beam selector 2 07 receives the reception signal information of the user signal at the path delay reception beam number output from the reception beam 1 path detector 2 06> to the reception beam M path detector 206. , And selects a set of path delay reception beam numbers to be used for demodulation based on the reception quality of the user signal, and transmits the reception quality information of the user signal at the selected path delay / reception beam number to the transmission beam selection unit 2. 09 and output to the demodulation processing unit 210.
- the transmission beam selection unit 209 receives the reception quality information of the user signal at the path delay reception beam number output from the path delay reception beam selection unit 207, and performs reception in which a delay path with excellent reception quality exists.
- the transmit beam number in the same direction as the beam is output to user 1 transmit beam switching circuit 2 1 2>.
- the number of transmission beams selected is smaller than the number of path delay Z reception beam number sets used for demodulation. In many cases, the number of transmitted beams is one. The reason is to reduce interference with other users due to transmission using multiple beams.
- the demodulation processing unit 210 receives the reception quality information of the user signal at the path delay / reception beam number output from the path delay / reception beam selection unit 207, and based on the input path delay reception beam number. To perform demodulation processing and output user 1 received data.
- User 1 modulation processing section 2 1 1 ′ to user L modulation processing section 2 1 1 ij Input user 1 transmission data to user L transmission data (user transmission data), perform modulation processing, and switch user 1 transmission beam.
- the user L transmission beam switching circuit 2 1 2 is composed of a user 1 transmission beam number to a user L transmission beam number output from the transmission beam selection unit 209 for each user, and a user 1 modulation processing unit 2 1 1 to 2.
- User L modulation processing unit 2 1 1 The user-modulated signal, which is the output of the user, is input, and the transmit beam forming unit corresponding to the transmit beam number for each user is selected from the transmit beam 1 forming unit 2 13 and the transmit beam J forming unit 2 13 j And outputs a user modulation signal.
- the transmission beam 1 forming section 2 1 3 to the transmission beam J forming section 2 1 3 j receive the output of the user 1 transmission beam switching circuit 2 1 2, to the user L transmission beam switching circuit 2 1 2, and input signals.
- the transmitting beam 1 forming section 2 13 to the receiving beam J forming section 2 13; are located in front of the antenna 1 wireless transmitting section 2 14, and the antenna K wireless transmitting section 2 14 ⁇ .
- beamforming is performed on digital signals in the band, it is also possible to use a beamforming method in a wireless band such as a Butler matrix.
- Antenna 1 Radio transmission unit 2 14, to Antenna K radio transmission unit 2 14 ⁇ is composed of amplifier, band limiting filter, mixer, local oscillator, quadrature modulation, low-pass filter, digital-to-analog converter, etc. Is done.
- the antenna 1 radio transmission unit 2 14 receives the outputs of the transmission beam 1 forming unit 2 13 to the transmission beam J forming unit 2 1 3 j It performs reception processing such as digital // analog conversion of input signals, quadrature modulation, frequency conversion from baseband to wireless band, signal amplification, and outputs the signals to the transmitting antenna element 2 16.
- the transmission array antenna 2 15 is composed of K transmission antenna elements 2 16 ⁇ to 2 16. There is no restriction on the directivity in the horizontal and vertical planes of the transmitting antenna element 2 16, up to 2 16 ⁇ alone. Examples are omni (omnidirectional) and dipole (bipolar directivity). No.
- the K transmitting antenna elements 2 16 i to 2 16 ⁇ are arranged close so that the transmission signals of each antenna element have a correlation.
- the transmitting array antenna 2 15 has ⁇ receiving antenna elements 2 16, to 2 16 ⁇ arranged close to each other. There is no restriction on the arrangement. For example, half wave of carrier wave Circular arrangement and linear arrangement at long intervals are mentioned.
- the K transmission antenna elements 2 16 i to 2 16 ⁇ are output from the antenna 1 radio transmission unit 2 14 ⁇ to antenna ⁇ radio transmission unit 2 14 ⁇ , A signal multiplexed with 1 signal to user L signal) is input and transmitted.
- the conventional multi-beam transmission / reception device shown in Fig. 7 selects a reception beam with a delay path with excellent reception quality from among a plurality of fixed reception beams at the time of reception, and performs reception at the time of transmission. By selecting a transmission beam in the same direction as the group with excellent reception quality from the set of path delay reception beam numbers, and performing transmission, the transmission and reception gain is increased in the desired signal direction, In other directions, beams can be formed to reduce the transmission / reception gain.
- the problem is that the transmission characteristics deteriorate in the conventional multi-beam antenna transmitting / receiving apparatus as shown in FIG.
- the reason is that the transmission beam in the same direction as the set of path delay No. with excellent reception quality is selected from the set of path delay ⁇ receive beam number selected at the time of reception. That the transmission beam cannot be selected.
- a transmission beam in the same direction as the set of path delay reception beam numbers having excellent reception quality is selected from the set of path delay / reception beam number selected during reception.
- the total reception quality is obtained by calculating (for example, adding) a part or the whole of the reception quality for each multipath component (path delay) included in the reception beam.
- the optimum transmission beam is a transmission beam in a direction that matches (same as) or is close to a reception beam with excellent total reception quality.
- the optimum transmission beam is used in a multipath environment. Cannot be selected.
- Path delay It is assumed that the reception beam selection unit 207 has selected the top two pairs (group, group) for the following four sets of path delay / reception beam numbers.
- the transmission beam selecting section 209 selects one transmission beam
- the reception quality of the pair is compared with that of the pair (10> 8).
- a transmission beam in the same direction as the above is selected.
- the conventional multi-beam antenna transmitting / receiving device it is impossible to select a truly optimal transmitting beam.
- An object of the present invention is to provide a multi-beam antenna transmitting / receiving apparatus and a transmitting / receiving method and a transmitting beam selecting method which select an optimal transmitting beam even in a multi-path environment, and have excellent transmission characteristics and channel quality.
- a multi-beam antenna transmission / reception apparatus of the present invention includes a plurality of reception beams and a plurality of transmission beams, and includes a reception quality of a path delay of a user signal existing in the plurality of reception beams.
- the transmission beam is selected based on the calculated total reception quality.
- the reception beam may be selected based on the total reception quality, and the transmission beam having a direction matching or approaching the direction of the selected reception beam may be selected.
- reception power or SIR Signal to Interference Ratio
- a receiving array antenna in which a receiving antenna element is arranged; a radio receiving unit that receives an output of the receiving antenna element as an input, performs reception processing on the input signal, and outputs the received signal;
- a receiving beam forming means for forming a receiving beam by using an output of the radio receiving means as an input; a path delay of a user signal existing in the receiving beam as an input to the receiving beam forming means; To calculate the user
- User demodulation means for outputting a user number, outputting user reception data using the path delay reception beam number, and user modulation processing means for inputting user transmission data, performing modulation processing, and outputting a user modulation signal
- a user transmission beam switching unit that inputs the user transmission beam number and the user modulation signal, and outputs the user modulation signal so that a transmission beam corresponding to the user transmission beam number is formed;
- a transmission beam forming unit that receives an output of the beam switching unit as an input, and forms the transmission beam;
- a wireless transmission unit that receives an output of the transmission beam forming unit as an input, performs transmission processing of an input signal, and outputs the processed signal;
- a transmission array antenna having a transmission antenna element for transmitting the output of the transmission means may be provided.
- the user demodulation unit detects a path delay for each user from an output of the reception beam forming unit, and a reception beam path detection unit that outputs the path delay / reception beam number; and an output of the reception beam path detection unit.
- the path delay reception beam selection means for selecting the path delay reception beam number used for demodulation from the reception quality of the user signal at the certain path delay Z reception beam number, and the path delay / reception beam selection means Demodulation processing means for performing demodulation using the path delay Z reception beam number; and total reception of user signals for each reception beam from reception quality of the user signal at the path delay reception beam number output from the reception beam path detection means.
- Receiving beam calculation processing means for calculating reception quality; and It may also be one and a transmission beam selection means for notifying the user transmission beam switching means from the total reception quality of the user signal selecting the transmission beam of each beam Rere.
- reception beam calculation processing means when calculating the total reception quality of the user signal for each reception beam from the reception quality of the user signal at the path delay / reception beam number which is the output of the reception beam path detection means,
- the received power may be used as an index of the received quality, and the total received power may be calculated as the total received quality.
- the reception beam calculation processing means outputs the reception beam path by the output of the reception beam path detection means.
- the SIR is used as an index of the reception quality
- the total SIR is calculated as the total reception quality.
- the total reception quality of the user signal may be calculated for each of the reception beams by using the reception quality at the path delay / reception beam number selected based on the above criterion.
- the reception beam calculation processing means may include, as the path delay Z reception beam number selected based on the predetermined criterion, the upper P (P is an integer of 2 or more) of the path delays having excellent reception quality.
- the receiving beam number may be selected.
- the reception beam calculation processing means may include a maximum of Q (Q is an integer of 2 or more) reception quality that satisfies a predetermined reception quality criterion as the path delay reception beam number selected based on the predetermined criterion.
- Q is an integer of 2 or more
- the reception beam calculation processing means uses the path delay / reception beam number selected by the path delay Z reception beam selection means as the path delay reception beam number selected based on the predetermined reference. You may.
- the multi-beam antenna transmission / reception method of the present invention includes a plurality of reception beams and a plurality of transmission beams, based on a total reception quality calculated from reception qualities of path delays of user signals existing in the plurality of reception beams. And selecting the transmission beam.
- the reception beam is selected based on the total reception quality, and the transmission beam having a direction matching or approaching the direction of the selected reception beam is selected. You may make it select.
- reception power or SIR SimultEntrefReRenc eRatio: signal-to-interference power ratio
- the user modulation signal is input, and a transmission beam corresponding to the user transmission beam number is formed.
- the user demodulation step includes detecting a path delay for each user from an output of the reception beam forming step, and outputting a path delay / reception beam number; and a reception beam path detection step.
- a path delay receiving beam number selecting step for selecting the path delay number receiving beam number to be used for demodulation from the reception quality of the user signal at the path delay Z number receiving beam number, which is an output, is notified from the path delay number receiving beam selecting step.
- a reception beam calculation processing step of calculating a total reception quality of a user signal A transmission beam selection step of selecting the transmission beam from the total reception quality of the user signals for each of the reception beams notified from the frame calculation processing step, and notifying the user of the transmission beam switching step.
- the reception beam calculation processing step when calculating the total reception quality of the user signal for each reception beam from the reception quality of the user signal at the path delay Z reception beam number output from the reception beam path detection step, The received power may be used as an index of the received quality, and the total received power may be calculated as the total received quality.
- the reception beam calculation processing step when calculating the total reception quality of the user signal for each reception beam from the reception quality of the user signal at the path delay Z reception beam number output from the reception beam path detection step,
- the SIR may be used as an index of the reception quality
- the total SIR may be calculated as the total reception quality.
- the receiving beam calculation processing step includes: receiving beam path detecting step ( ⁇ calculating the total reception quality of the user signal for each of the reception beams from the reception quality of the user signal at the path delay Z reception beam number that is the output, The total reception quality of the user signal may be calculated for each of the reception beams using the reception quality of the path delay reception beam number selected based on a predetermined criterion.
- the reception beam calculation processing step may include, as the path delay reception beam number selected based on the predetermined criterion, the upper P (P is an integer of 2 or more) path delay Z reception beams having excellent reception quality. A number may be selected.
- the reception beam calculation processing step may include: up to Q (Q is an integer of 2 or more) whose reception quality satisfies a predetermined reception quality criterion as the path delay reception beam number selected based on the predetermined criterion. , The path delay Z of the received beam number may be selected.
- the reception beam calculation processing step uses the path delay / reception beam number selected in the path delay reception beam selection step as the path delay reception beam number selected based on the predetermined reference. You may.
- Calculating a total reception quality by adding a value of the reception quality for each path delay of the user signal to each of the reception beams; selecting a reception beam having excellent total reception quality; Selecting a transmission beam having a direction matching or approaching the direction of the received reception beam.
- the transmission beam selection method of the present invention selects a transmission beam based on the total reception quality calculated from the reception quality of the path delay of the user signal existing in the reception beam. It is characterized by the following.
- the reception beam may be selected based on the total reception quality, and a transmission beam having a direction matching or approaching the direction of the selected reception beam may be selected.
- a base station according to the present invention includes the above-described multi-beam antenna transmitting / receiving apparatus. Further, a mobile station according to the present invention includes the above-described multi-beam antenna transmitting / receiving device.
- FIG. 1 is a block diagram showing an embodiment of a multi-beam antenna transmitting / receiving apparatus according to the present invention.
- FIG. 2 is an explanatory diagram of transmission beam selection.
- Figure 3 shows the reception quality table.
- Figure 4 is a beam number comparison table.
- FIG. 5 is a flowchart of the multi-beam antenna transmission / reception method of the present invention.
- FIG. 6 is a flowchart of a user demodulation step of the multibeam antenna transmission / reception method of the present invention.
- FIG. 7 is a block diagram showing an embodiment of a conventional multi-beam antenna transmitting / receiving apparatus. Detailed description of the embodiment
- the number of users is L (L is an integer of 1 or more)
- the number of receiving antenna elements is N (N is an integer of 1 or more)
- the number of receive beams is M (M is an integer of 1 or more)
- transmission is performed.
- the number of beams is J (J is an integer of 1 or more)
- the number of transmitting antenna elements is K (K is an integer of 1 or more). Therefore, the number of users is user 1 to user L, and there are L user signals, which are user 1 signal to user L signal.
- the receive beams are receive beam 1 to receive beam M, and the transmit beam is transmit beam 1 to transmit beam J.
- a multi-beam antenna transmitting / receiving apparatus includes a receiving array antenna 101, a receiving antenna element l OSil OSN constituting the receiving array antenna 101, and receiving antenna elements 102, to 102N.
- antenna 1 wireless receiving section 103 to antenna N wireless receiving section 103 N (also called wireless receiving section 103), receiving beam 1 forming section 104, to receiving beam M forming section 104 M (receiving beam forming section 104
- User 1 demodulation block 105 i to user L demodulation block 105 also referred to as user demodulation block 105) and user 1 modulation processing unit 1 1 1 i to user L modulation processing unit 1 1 (user modulation Processing section 1 1 1)
- user 1 transmission beam switching circuit 1 1 2 to user L transmission beam switching circuit 1 1 2 L also referred to as user transmission beam switching circuit 1 1 2
- transmission beam 1 forming section 1 1 3 ⁇ Transmission beam J formation 1 1 3; (also referred to as transmission beam forming unit 113), and antennas corresponding to transmission antenna elements 1 16, to 1 16 ⁇ 1 radio transmission unit 1 14 i to antenna K radio transmission unit 1 14 ⁇ (radio transmission unit 1 14), a transmitting antenna element 1 16 i to l 16 ⁇ corresponding to the radio transmit
- the directivity in the horizontal plane and in the vertical plane of the receiving antenna element 102 t to 102 N there is no limitation on the directivity in the horizontal plane and in the vertical plane of the receiving antenna element 102 t to 102 N alone, and examples include omni (omnidirectional) and dipole (dipole directivity).
- N receiving antenna elements 102, to 1 02 N the received signal is arranged in close proximity so as to have a correlation.
- the receiving array antenna 101, receiving antenna elements 102, be disposed in proximity is to 102 N, the receiving antenna elements 1 02, to 1 02 N number of, and are not limited to how the arrangement.
- Examples of the arrangement method include a circular arrangement and a linear arrangement at half wavelength intervals of carrier waves.
- the receiving antenna elements 1 02 signals received by T ⁇ l 02 N contains desired user signal component and a plurality of interfering signal components, and thermal noise. Furthermore, there are multiple multipath components for each of the desired user signal component and the interference signal component. Usually, these signal components (desired user signal components including multipath components and interference signal components) come from different directions. Therefore, there are a plurality of sets of the path delay / received beam number of the desired user signal.
- Antenna 1 Wireless receiver 103 t ⁇ Antenna N Wireless receiver 103 N has low noise It consists of an amplifier, a band-limiting filter, a mixer, a local oscillator, an automatic gain controller (AGC), a quadrature detector, a low-pass filter, and an analog / digital converter.
- AGC automatic gain controller
- the antenna 1 wireless receiving unit 103 receives the output of the receiving antenna element 102, amplifies the input signal, and sets the frequency from the wireless band to the base band. It performs reception processing such as conversion, quadrature detection, and analog-to-digital conversion, and outputs it to the receive beam 1 forming unit 104i to the receive beam M forming unit 104M.
- Receive beam 1 forming part 104! ⁇ Reception beam M forming unit 104M receives the output of the antenna 1 radio reception section 103 i to antenna N radio receiving unit 103 N, and against the input signal for each reception beam forming unit 104 A different fixed reception beam is formed and output to the user 1 demodulation block 105i to the user L demodulation block 105L.
- the reception in Figure 1 beam 1 forming part 104, - receiving the beam M forming unit 1 04M is in the subsequent stage of the antenna 1 radio reception section 103 i to antenna N radio receiving section 1 03 N, pairs into a digital signal of baseband
- beam forming is performed, a beam forming method in a wireless band such as a Butler matrix can be used.
- the receiving beam 1 forming section 104, to the receiving beam M forming section 104M receive the receiving beam for the input signal including all the user signal (user 1 signal to user signal) components and the multipath component of the user signal.
- a different fixed reception beam is formed for each forming section 104, and an input signal is separated for each direction of arrival.
- User 1 transmission beam number to user L transmission beam number User transmission beam number
- user 1 received data to user L received data user received data
- the user 1 demodulation block 105 and the user 1 demodulation block 105 of the user L demodulation block 105 ⁇ will be described as an example.
- the user 1 demodulation block 105 receives the outputs of the reception beam 1 forming section 104 and the reception beam M forming section 104 as inputs and outputs the user 1 transmission beam number and the user 1 reception data.
- Receive beam 1 path detector 1 06 - reception beam M path detector 106 M receives the output of the ⁇ reception beam M forming unit 104, the path of the user signals at the respective input signal The delay is detected, the reception quality of the user signal at the detected path delay is measured, and the path delay Z reception beam number and the like are determined by the path delay Z reception beam selection section 107 and reception beam 1 calculation processing section 108 to reception beam M calculation processing. Output to the control unit 08.
- a user 1 signal to a user L signal are multiplexed on each input signal, and a multipath component of each user signal due to a propagation delay is multiplexed.
- reception quality index examples include reception power (including reception level, reception electric field strength, etc.;) and SIR (Signal to Interference Ratio).
- SI NR Signal-to-interference power + noise power ratio
- SNR Signal-to-noise ratio
- the reception beam 1 path detection section 106 to the reception beam M path detection section 106 uses only known symbols (such as pilot symbols) of the user signal to detect the path and the reception quality of the user signal in the path delay related to the detected path. It is also possible to make measurements.
- the path delay reception beam selection unit 107 receives the reception beam 1 path detection unit 106, Beam M path detection unit 106 Receives user signal reception quality information at path delay / reception beam number output from 106 M, and sets path delay reception beam number used for demodulation based on user signal reception quality. And outputs the selected set of path delay / received beam number to the demodulation processing unit 110.
- the method of selecting a set of path delay reception beam numbers used for demodulation there is no limitation on the method of selecting a set of path delay reception beam numbers used for demodulation.
- B is an integer of 2 or more
- Receive beam 1 calculation processing unit 108 t ⁇ Receive beam M calculation processing unit 108 M is a receive beam 1 path detection unit 106 corresponding to each reception beam, ⁇ reception beam M path detection unit 106 M
- the path delay which is the output of the system, receives the reception quality information of the user signal at the reception beam number as input, calculates the total reception quality of the user signal for each reception beam, Are output to the transmission beam selection unit 109.
- the total reception quality is obtained by calculating (for example, adding) a part or the whole of the reception quality for each multipath component (path delay) included in the reception beam.
- an index of the total reception quality of the user signal calculated for each reception beam there is a method of using the reception power of the user signal at the path delay / reception beam number notified for each reception beam.
- an index of the total reception quality of the user signal calculated for each reception beam a method using the SIR of the user signal at the path delay reception beam number notified for each reception beam can be cited.
- the present invention also includes a method of calculating the total reception quality of the user signal for each reception beam using only the reception quality of the user signal at the reception beam number selected based on the path delay.
- the upper P (P is an integer of 2 or more) path delay reception beam numbers with excellent reception quality of the user signal are used as the path delay Z reception beam number selected based on a certain criterion.
- Method as the path delay beam number selected based on a certain criterion, up to Q (Q is an integer of 2 or more) path delay beam reception beams whose user signal reception quality satisfies the certain reception quality criterion. There is a method using a number.
- a method using the path delay reception beam number selected by the path delay reception beam selector 107 as the path delay reception beam number selected based on a certain criterion may be used.
- the transmission beam selection unit 109 receives the reception beam number output from the reception beam 1 calculation processing unit 108 to the reception beam M calculation processing unit 108 and the total reception quality information of the user signal in the reception beam.
- user 1 transmit beam number to user L transmit beam number (user transmit beam number) that has a direction matching or approaching the receive beam number with excellent total reception quality
- User 1 transmit beam switching circuit 1 1 2 Output to The demodulation processing unit 110 receives as input the reception quality information of the user signal at the path delay Z reception beam number output from the path delay reception beam selection unit 107, and based on the input path delay reception beam number. To perform demodulation processing and output user 1 received data.
- User 1 modulation processing section 1 1 1 1 ′ to user L modulation processing section 1 1 1 L receives user 1 transmission data to user L transmission data (user transmission data) as input, performs modulation processing, and performs user 1 modulation signal to User 1 transmit beam switching circuit for user L modulation signal (user modulation signal) 1 1 2! ⁇ ⁇ ⁇ Output to the user L transmission beam switching circuit.
- the user 1 transmission beam switching circuit 1 1 2, to the user L transmission beam switching circuit 1 1 2 L is a user 1 transmission beam number which is an output of the transmission beam selection unit 109 for each user (user 1 to user L).
- the transmission beam forming unit 113 corresponding to the user transmission beam number for each user is selected from the units 113 to transmission beam J forming unit 113 to output a user modulated signal.
- the transmit beam 1 forming unit 1 13 to transmit beam J forming unit 1 13 receives the output of the user 1 transmit beam switching circuit 1 1 2 to the user L transmit beam switching circuit 1 1 2 ,
- the transmission beam 1 forming unit 1 3 ⁇ transmission beam J forming unit 1 1 3 A different fixed transmission beam is formed and output to antenna 1 wireless transmission section 114, to antenna K wireless transmission section 114 ⁇ .
- the transmitting beam 1 forming unit 1 13, to the receiving beam J forming unit 1 13 are located in front of the antenna 1 wireless transmitting unit 1 14 i to the antenna K wireless transmitting unit 1 14 ⁇ ,
- a beamforming method in a wireless band such as a Butler matrix may be used.
- Antenna 1 wireless transmitter 1 1 -4 to antenna K wireless transmitter 1 1 14 ⁇ is composed of amplifier, band limiting filter, mixer, local oscillator, quadrature modulation, low-pass filter, digital-to-analog converter, etc.
- the antenna 1 wireless transmission section 1 14 i takes the antenna 1 wireless transmission section 1 14 i as an example, the antenna 1 wireless transmission section 1 14 i outputs the output of the transmission beam 1 forming section 1 13 i to the transmission beam J forming section 1 13. And performs transmission processing such as digital Z-analog conversion, quadrature modulation, frequency conversion from baseband to wireless band, and signal amplification of the input signal, and outputs it to the transmission antenna element 116.
- the transmission array antenna 1 15 is composed of ⁇ transmission antenna elements 1 16, to 1 16 ⁇ .
- the transmitting antenna elements 1 16 to 1 16 ⁇ are arranged close so that the signals to be transmitted have a correlation.
- there is no particular limitation on the arrangement of the transmission antenna 1115 as long as the transmission antenna elements 1116 and 1116k are arranged close to each other. Examples include a circular arrangement and a linear arrangement at half-wavelength intervals of carrier waves.
- the transmitting antenna elements 1 16 i to l 16 ⁇ have the antenna 1 radio transmitting unit 1 14, to the antenna K radio transmitting unit 1 14 ⁇ , and the user signals from the respective transmitting beams are multiplexed. Sends a signal as input.
- Fig. 2 is an explanatory diagram of transmission beam selection, focusing on the components required for the explanation.
- Fig. 3 shows the reception quality table
- Fig. 4 shows the beam number comparison table. The operation of transmitting beam selection when the user number is 1 and the receiving beam numbers are 1 and 2 will be described in detail.
- FIG. 2 shows the receive beam 1 to the receive beam M (receive beam), here, the description will be made assuming that only the receive beam 1 and the receive beam 2 are provided.
- the reception beam calculation processing unit 108 calculates (for example, adds) the total reception quality from the reception quality of the user 1 signal for each of the reception beams 1 and 2 as shown in FIG.
- the reception beam number and the total reception quality information of the user 1 signal for each reception beam are output to the transmission beam selection unit 109.
- the transmission beam selection unit 109 selects 2 as the reception beam number because the reception beam having the excellent total reception quality is the reception beam 2.
- 1 is selected as the transmission beam number corresponding to the direction matching or approaching the reception beam 2.
- the user 1 transmit beam number is set to 1 and output to the user 1 transmit beam switching circuit 112.
- the user 1 transmit beam switching circuit 1 1 switches to the transmit beam 1 forming section 1 13, which forms the transmit beam 1, and the user 1 transmit data of user 1 is radiated by the formed transmit beam 1.
- the multi-beam antenna transmitting / receiving apparatus of the present invention can be used for a base station and a mobile station constituting a mobile communication system.
- FIG. 5 is a flowchart showing the multi-beam antenna transmission / reception method of the present invention.
- FIG. 6 is a flowchart showing a user demodulation step of the multibeam antenna transmission / reception method of the present invention.
- the multi-beam antenna transmission / reception method will be described below with reference to FIGS.
- the wireless receiving step S1 is performed by the antenna 1 wireless receiving unit 103, to the antenna N wireless receiving unit 103N.
- a reception beam is formed using the output of the radio reception step S1 as an input (reception Beam forming step S 2).
- the receiving beam forming step S2 is performed by the receiving beam 1 forming unit 104i to the receiving beam M forming unit 104M.
- the user demodulation step S3 is based on the user 1 demodulation block 105 to the user L demodulation block 105.
- the user transmission data is input, modulation processing is performed, and a user modulation signal is output (user modulation processing step S4).
- the user modulation processing step S4 is performed by the user modulation processing unit 111 to the user modulation processing unit 111.
- a user transmission beam number and a user modulation signal are input, and a user modulation signal is output so that a transmission beam corresponding to the user transmission beam number is formed (user transmission beam switching step S5).
- This user transmission beam switching step S5 is performed by the user 1 transmission beam switching circuit 1 1 2 to the user L transmission beam switching circuit 1 1 2.
- the output of the user transmission beam switching step S5 is input and a transmission beam is formed (transmission beam forming step S6).
- the transmission beam forming step S6 is performed in the transmission beam 1 forming section 1 1 3! ⁇ Based on the transmission beam J forming unit 1 1 3 j.
- the output of the transmission beam forming step S6 is input, the input signal is subjected to transmission processing such as digital / analog conversion, quadrature modulation, frequency conversion, amplification, etc., and output to the transmission antenna element (wireless transmission step S7).
- This wireless transmission step S7 is performed by the antenna 1 wireless transmission section 114, the antenna K wireless transmission section 114 ⁇ , and the transmission array antenna 115.
- a path delay for each user is detected from the output of the reception beam forming step S2, and path delay / reception beam number and the like are output.
- reception beam path detection step S31 The reception beam path detection step S31 is performed by the reception beam 1 path detection unit 106, to the reception beam ⁇ path detection unit 106M.
- a path delay reception beam number used for demodulation is selected from the reception quality information of the user signal at the path delay reception beam number output from the reception beam path detection step S31 (path delay reception beam selection step S32).
- path delay reception beam selection step S32 is performed by the path delay / reception beam selection unit 107.
- demodulation is performed using the path delay Z reception beam number notified from the path delay reception beam selection step S32 (demodulation processing step S33).
- the demodulation processing step S33 is performed by the demodulation processing unit 110.
- reception beam calculation processing step S34 is performed by the reception beam 1 calculation processing section 108! ⁇ Receiving beam M calculation processing unit
- a transmission beam is selected from the total reception quality information of the user signals for each reception beam notified from the reception beam calculation processing step S34, and is notified to the user transmission beam switching step S5 (the transmission beam selection step S3 Five ) .
- the transmission beam selection step S35 is performed by the transmission beam selection unit 109.
- the total reception quality of the user signal for each reception beam is obtained from the reception quality information of the user signal at the path delay / reception beam number output from the reception beam path detection step S31.
- the received power is used as an index of the received quality, and the total received power is calculated as the total received quality.
- the total reception quality of the user signal for each reception beam is calculated from the reception quality information of the user signal at the path delay Z reception beam number output from the reception beam path detection step S31.
- SIR is used as an index of reception quality
- total SIR is calculated as total reception quality.
- the total reception quality of the user signal is calculated for each reception beam from the reception quality information of the user signal at the path delay reception beam number output from the reception beam path detection step S31. At this time, the total reception quality of the user signal is calculated for each reception beam using only the reception quality of the user signal at the path delay reception beam number selected based on a certain criterion.
- the path delay / reception of the upper P (P is an integer of 2 or more) path delay / reception with excellent reception quality of the user signal at the reception beam number selected based on a predetermined criterion. Select a beam number. Further, in the reception beam calculation processing step S34, the maximum reception quality of the user signal at the path delay reception beam number selected based on the predetermined criterion satisfies the predetermined reception quality criterion (Q is an integer of 2 or more. Select the path delay reception beam number up to).
- the path delay Z reception beam number selected by the path delay Z reception beam selection unit is used as the path delay / reception beam number selected based on a predetermined criterion.
- the total reception quality of the user signals (user 1 signal to user L signal) for each reception beam (reception beam 1 to reception beam M) is calculated, and the same direction or proximity to the reception beam having the excellent total reception quality is calculated. Since the transmission beam in the direction is selected, the optimal transmission beam can be selected even in a multipath environment. Therefore, it has excellent transmission characteristics and excellent uplink and downlink or downlink line quality.
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Radio Transmission System (AREA)
- Mobile Radio Communication Systems (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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EP03705327.9A EP1492252B1 (en) | 2002-03-27 | 2003-02-19 | Multi-beam antenna transmitter/receiver and transmitting/receiving method and transmission beam selection method |
US10/509,017 US7274951B2 (en) | 2002-03-27 | 2003-02-19 | Multi-beam antenna transmitter/receiver and transmitting/receiving method and transmission beam selection method |
AU2003211535A AU2003211535A1 (en) | 2002-03-27 | 2003-02-19 | Multi-beam antenna transmitter/receiver and transmitting/receiving method and transmission beam selection method |
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JP2002-88967 | 2002-03-27 | ||
JP2002088967A JP3956739B2 (ja) | 2002-03-27 | 2002-03-27 | マルチビームアンテナ送受信装置及び送受信方法並びに送信ビーム選択方法 |
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PCT/JP2003/001791 WO2003081805A1 (fr) | 2002-03-27 | 2003-02-19 | Emetteur/recepteur a antenne multi-faisceaux, procede d'emission/reception et procede de selection de faisceau d'emission |
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US (1) | US7274951B2 (ja) |
EP (1) | EP1492252B1 (ja) |
JP (1) | JP3956739B2 (ja) |
CN (1) | CN100440754C (ja) |
AU (1) | AU2003211535A1 (ja) |
WO (1) | WO2003081805A1 (ja) |
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US7286800B2 (en) | 2002-12-12 | 2007-10-23 | Nec Corporation | Multi-beam antenna reception device and multi-beam reception method |
US10448403B2 (en) | 2015-10-06 | 2019-10-15 | Sony Corporation | Apparatus and method for beam selection in downlink transmission |
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JPWO2005055466A1 (ja) * | 2003-12-01 | 2008-04-17 | 日本電気株式会社 | マルチビーム送受信装置および送受信方法 |
CN1910831B (zh) * | 2003-12-16 | 2011-01-05 | 三菱电机株式会社 | 无线通信装置 |
US7904039B2 (en) | 2004-01-30 | 2011-03-08 | UNIVERSITé LAVAL | Multi-user adaptive array receiver and method |
JP5588594B2 (ja) * | 2007-12-26 | 2014-09-10 | 富士通株式会社 | 無線通信システムにおける通信方法並びに無線端末及び無線基地局 |
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CN102084597B (zh) * | 2008-05-09 | 2014-06-18 | 苹果公司 | 用于支持蜂窝网络中天线波束形成的系统和方法 |
US9137698B2 (en) * | 2012-02-24 | 2015-09-15 | Samsung Electronics Co., Ltd. | Beam management for wireless communication |
KR20130124004A (ko) * | 2012-05-04 | 2013-11-13 | 삼성전자주식회사 | 밀리미터 전파 통신 시스템에서 전송기법에 따른 자원할당 방법 및 장치 |
KR20130125903A (ko) * | 2012-05-10 | 2013-11-20 | 삼성전자주식회사 | 통신시스템에서 빔포밍을 수행하는 방법 및 장치 |
KR101877775B1 (ko) * | 2012-11-26 | 2018-07-13 | 삼성전자주식회사 | 무선통신 시스템에서 기지국 간 협업 통신을 위한 간섭 제거 코드를 할당하는 방법 및 장치 |
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JP2018152723A (ja) * | 2017-03-13 | 2018-09-27 | 株式会社東芝 | 無線通信装置および無線通信方法 |
KR102622030B1 (ko) * | 2018-11-26 | 2024-01-08 | 삼성전자 주식회사 | 인공신경망 기반의 수신 빔 선택 방법 및 장치 |
CN111726820B (zh) * | 2019-03-20 | 2024-02-20 | 株式会社Ntt都科摩 | 由基站执行的方法及相应的基站 |
US11871215B2 (en) * | 2019-09-18 | 2024-01-09 | Qualcomm Incorporated | Uplink-centric handover in a wireless multi-hop network |
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- 2003-02-19 AU AU2003211535A patent/AU2003211535A1/en not_active Abandoned
- 2003-02-19 US US10/509,017 patent/US7274951B2/en not_active Expired - Fee Related
- 2003-02-19 CN CNB038123282A patent/CN100440754C/zh not_active Expired - Fee Related
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Also Published As
Publication number | Publication date |
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JP2003283394A (ja) | 2003-10-03 |
US20050153657A1 (en) | 2005-07-14 |
AU2003211535A1 (en) | 2003-10-08 |
EP1492252A1 (en) | 2004-12-29 |
JP3956739B2 (ja) | 2007-08-08 |
US7274951B2 (en) | 2007-09-25 |
EP1492252B1 (en) | 2013-05-22 |
CN1656711A (zh) | 2005-08-17 |
CN100440754C (zh) | 2008-12-03 |
EP1492252A4 (en) | 2010-12-29 |
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