WO2004032376A1 - Appareil de communication en amcr - Google Patents

Appareil de communication en amcr Download PDF

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Publication number
WO2004032376A1
WO2004032376A1 PCT/JP2002/010398 JP0210398W WO2004032376A1 WO 2004032376 A1 WO2004032376 A1 WO 2004032376A1 JP 0210398 W JP0210398 W JP 0210398W WO 2004032376 A1 WO2004032376 A1 WO 2004032376A1
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WO
WIPO (PCT)
Prior art keywords
beamformer
channel
cdma communication
spread
antenna
Prior art date
Application number
PCT/JP2002/010398
Other languages
English (en)
Japanese (ja)
Inventor
Tadashi Nakamura
Tomonori Sato
Original Assignee
Fujitsu Limited
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fujitsu Limited filed Critical Fujitsu Limited
Priority to PCT/JP2002/010398 priority Critical patent/WO2004032376A1/fr
Publication of WO2004032376A1 publication Critical patent/WO2004032376A1/fr

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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
    • H04B7/0615—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
    • 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
    • H04B1/707—Spread spectrum techniques using direct sequence modulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B2201/00—Indexing scheme relating to details of transmission systems not covered by a single group of H04B3/00 - H04B13/00
    • H04B2201/69—Orthogonal indexing scheme relating to spread spectrum techniques in general
    • H04B2201/707—Orthogonal indexing scheme relating to spread spectrum techniques in general relating to direct sequence modulation
    • H04B2201/7097—Direct sequence modulation interference
    • H04B2201/709709—Methods of preventing interference

Definitions

  • the present invention relates to a communication device (CDMA communication device) compatible with a CDMA system having a beam forming function, and in particular, performs adaptive beam forming processing on transmission data for each individual channel and transmits the data. It is suitable for use in a wireless base station compatible with the CDMA system that transmits downlink common channel transmission data using fixed multi-beams in multiple directions.
  • CDMA communication device compatible with a CDMA system having a beam forming function
  • a digital cellular radio communication system using DS-CDMA technology is being developed as a next-generation mobile communication system for realizing wireless multimedia communication.
  • the CDMA system is a system in which channels are allocated by codes and simultaneous communication is performed, but signals from other channels that are simultaneously talking cause interference, and as a result, the number of channels that can be talked simultaneously (channel capacity) ) Is limited.
  • channel capacity channel capacity
  • Figure 15 is a block diagram of the array antenna system, showing only one user (that is, one channel).
  • Numeral 1 denotes a linear array antenna for reception, which has n antenna elements l i to In. 2 i to 2 n are receiving circuits (R V), not shown, each of which includes a high-frequency amplifier, a frequency converter, a quadrature demodulator, an AD converter, and the like.
  • the array antenna 1 and the receiving circuits 2 to 2 n are provided in common for all the channels.
  • Reference numeral 3 denotes a searcher unit that obtains a correlation signal from the reception signal of each antenna element, searches for the despreading start timing in the demodulation unit from the correlation signal, and filters the correlation signal. Input to adaptive weight calculation unit for adaptive weight calculation.
  • Reference numeral 4 denotes an adaptive weight operation unit (AWC), which is based on a converging algorithm represented by LMS and adaptive weighting based on DoA information using a correlation signal input from the searcher unit 3.
  • AWC adaptive weight operation unit
  • W l, W2, ⁇ ⁇ ⁇ Wn. 5 is input
  • a despreading unit that multiplies the signal to be spread by a spreading code and despreads is provided with n pieces corresponding to the antennas.
  • Numeral 6 denotes a beamformer, which has adaptive weights W1, W2,. ⁇ It has n multipliers MP i MP n for multiplying by Wn and an adder AD for adding the multiplier outputs.
  • Reference numeral 7 denotes a normal DS-CDMA demodulation unit, a despreading unit that multiplies a signal input from the beamformer by a spreading code to despread, and a channel estimating unit that performs a channel estimation calculation ( It has a channel compensation section), a data judgment section, and so on.
  • S a S an is a matched filter (MF), their respective antenna elements l 1-receiver circuits 2 1 to complex signal deca from 2n of ln (I, Q data) To output correlation signals Xl (t), X2 (t),..., Xn (t).
  • 3b is a timing determination unit, which detects K correlation signals from the larger power of the correlation signals Xl (t), X2 (t),..., Xn (t), and The despreading start timing is determined based on the correlation signal, and the K correlation signals are notified to the adaptive weight calculation unit 4.
  • the adaptive weight calculation unit 4 calculates adaptive weights Wl, W2,. Set to beamformer 6.
  • the beamformer 6 performs amplitude control and phase rotation control according to the bits W1, W2,..., Wn set in the received signal, and synthesizes and inputs the result to the demodulation unit 7.
  • the outputs of all antenna elements received from user i can be in phase, and the beam can be directed adaptively in the direction of the arrival angle (direction of user i). That is, by estimating the path arrival direction of the user signal from the correlation signal or by using a convergent algorithm such as LMS, the signals received by each antenna are directed to the antenna beam in the direction estimated from the information. Track the user by multiplying the signal by weight.
  • FIG. 16 is an explanatory diagram of transmission beamforming.
  • 6 ' is a transmission beamformer
  • ⁇ ' is a spread modulator
  • ⁇ is a transmission circuit (TR)
  • li ⁇ are antenna elements of the array antenna 1 for both transmission and reception.
  • Transmission circuit (TR) 8 ⁇ ⁇ 8 ⁇ is not shown, Converter, quadrature modulator, frequency converter, high frequency amplifier, etc. If the adaptive weights Wl, W2, '-' Wn of the receive beamformer are obtained, the complex conjugates Wl *, W2 *, '''Set Wn * to transmit beamformer 6'
  • Spread modulator ⁇ ' multiplies the transmit data by a spread code to spread, and transmit beamformer 6' applies adaptive way to the spread modulated signal.
  • a broadcast channel such as CPICH (Common Pilot Channel), CCPCH (Common Control Physical Channel) is used. ), SCH (Synchronization Channel), AICH (Acquisition Indication Channel), PICH (Page Indication Channel), and so on.
  • the broadcast channel is a channel for broadcasting the information used in the entire cell, and needs to be able to receive at least a certain quality in the cell. Therefore, the broadcast channel is normally transmitted so as to be uniform (omni) within the cell (sector) as shown in Figure 18.
  • the broadcast channel modulator 11 spreads the broadcast data with a channelization code CC and then spreads it with a scramble code SC. Then, the input signal is input to the first antenna element 10 i of the adaptive array antenna 10.
  • Spread modulation of dedicated channel ⁇ Beamformer unit 12 ⁇ ⁇ : L2 n has a configuration in which the transmission beamformer 6 'and the spread modulation unit 7' shown in Fig. 16 are combined. The data is subjected to spread modulation and transmit beam forming and output.
  • the combiner 13 includes a broadcast channel modulator 11 and a spread modulation / beamformer 12 1 to 12.
  • FIG. 20 is another conventional configuration diagram for transmitting a broadcast channel by omni, and the same parts as those in FIG. 19 are denoted by the same reference numerals.
  • the antenna 16, high-frequency amplifier 17, and frequency converter 18 are provided independently for broadcast signal transmission, and the broadcast signal spread by the broadcast channel modulator 11 is converted to a high-frequency signal independently of the user data. After that, it is amplified by high frequency and transmitted from the antenna 16.
  • the transmission power increases only in the amplifier 15 i that outputs the broadcast channel signal among the transmission amplifiers lS iie connected to the antenna elements 10 l to 104 constituting the adaptive array antenna 10. This is a major problem when performing calibration between antenna elements.
  • the configuration of FIG. 20 which avoids this, it is necessary to prepare an amplifier 17 and an antenna 16 dedicated to the broadcast channel.
  • the radio wave reach differs between the omni case and the directivity case, which results in areas where individual channel data can be received but broadcast data cannot be received. I do.
  • a first CDMA communication apparatus includes: an array antenna having a plurality of antenna elements; a beamformer for performing adaptive beamforming processing on transmission data for each individual channel; and a spreader for spreading and modulating transmission data of a common channel.
  • the first CDMA communication apparatus by transmitting transmission data of a common channel with directivity by transmission beamforming, an antenna dedicated to a broadcast channel is not required, and Since the imbalance between transmitters can be eliminated, calibration can be performed easily, and furthermore, the data reach of the broadcast channel and the individual channel can be made the same. In addition, the spreading code of the spreading modulator according to the adjacent beam is changed. By making them different, it is possible to prevent interference between adjacent broadcast channel signals.
  • a second CDMA communication apparatus includes an array antenna having a plurality of antenna elements, a beamformer for performing adaptive beamforming processing on transmission data for each individual channel, and a spreader for spreading and modulating transmission data of a common channel.
  • a digital beamformer that forms a beam in a predetermined direction by performing beam forming processing on an output signal of the spread modulation unit based on a weighting factor, and swings a beam direction by periodically changing the weighting factor.
  • a beam swing control unit that combines the antenna element input signals from each beamformer for each antenna element and inputs the signal to the antenna element.
  • the transmission data of the common channel is provided with directivity by transmission beamforming, and the beam direction of the common channel is periodically changed by swinging.
  • the amount of hardware can be reduced as compared with the first CDMA communication apparatus that forms multi-beams using a plurality of beamformers.
  • code resources can be saved, and the configuration of a mobile station can be simplified.
  • FIG. 1 is a first schematic explanatory diagram of the present invention.
  • FIG. 2 is a second schematic explanatory diagram of the present invention.
  • FIG. 3 is a third schematic explanatory diagram of the present invention.
  • FIG. 4 is a configuration diagram of a first embodiment of the transmission unit in the base station.
  • FIG. 5 is a configuration diagram of a second embodiment of the transmission / reception unit in the base station.
  • FIG. 6 is a configuration diagram of a transmission unit including an AICH transmission unit.
  • FIG. 7 shows a first modification of the second embodiment.
  • FIG. 8 shows a second modification of the second embodiment.
  • FIG. 9 is a configuration diagram of a third embodiment of the transmission unit in the base station.
  • FIG. 10 is a configuration diagram of a fourth embodiment of the transmission unit in the base station.
  • FIG. 11 is a configuration diagram of a fifth embodiment of the transmission / reception unit in the base station.
  • FIG. 12 shows a first modification of the fifth embodiment.
  • FIG. 13 shows a second modification of the fifth embodiment.
  • FIG. 14 is a configuration diagram of a sixth embodiment of the transmission / reception unit in the base station.
  • Figure 15 shows the configuration of the array antenna system.
  • FIG. 16 is an explanatory diagram of transmission beamforming.
  • Fig. 17 is an explanatory diagram of beam directivity by beam forming.
  • FIG. 18 is a diagram for explaining conventional common channel transmission.
  • FIG. 1.9 is a conventional block diagram for transmitting a broadcast channel by omni.
  • FIG. 20 is another configuration diagram of a conventional system for transmitting a broadcast channel by omni.
  • FIG. 1 is a first schematic explanatory diagram of the present invention.
  • a beam forming process is applied to the transmission data for each individual channel to drive the plurality of antenna elements 51i to 51 of the array antenna 51, and beams having different directivities (individual CH # 0 to ##) 3) occurs.
  • For the downlink common channel (broadcast channel) fixed downlink multibeams (broadcast CH # 0 to #n) in multiple directions are generated. That is, a beamforming process is performed on the broadcast channel signal for each beam so that the beam is directed in a plurality of downlink directions, and a plurality of antenna elements of the array antenna 51 are driven, and a multi-beam (broadcast CH # 0 to # n).
  • the spread code for spreading the broadcast channel signal is made different so that the broadcast channel signals transmitted by adjacent beams do not interfere with each other. '
  • the dedicated antenna for the broadcast channel is not required, and the calibration can be easily performed because the imbalance between the transmitters can be eliminated.
  • the broadcast channel and the individual channel can be used together.
  • the cell radius of both channels can be made the same for beamforming. Also, by making the spreading codes different according to adjacent beams, it is possible to prevent interference between adjacent broadcast channel signals.
  • FIG. 2 is a second schematic explanatory diagram of the present invention.
  • An adaptive beamforming process is performed on the transmission data for each individual channel to drive a plurality of antenna elements 51 i to 5 l4 of the array antenna 51, and beams having different directivities (individual CH # 0 to # 3) appear.
  • a plurality of antenna elements of the array antenna 51 are driven by performing beamforming processing on the broadcast channel signal based on the weighting factor, and a beam (broadcast) in a predetermined direction is obtained.
  • (CH # 0) is generated electrically, and the beam is periodically changed to swing the beam in a fixed direction (clockwise in the figure).
  • the amount of hardware can be reduced as compared with the method of forming a multibeam using the plurality of beamformers of FIG.
  • FIG. 3 is a third schematic explanatory diagram of the present invention.
  • the beam direction of the broadcast channel is randomly swung at a predetermined period (T).
  • T a predetermined period
  • the beam swing direction in FIG. 2 is a force S that is constant clockwise, and in FIG. 3, the beam swing direction is random.
  • “random” does not mean switching in order to the adjacent direction, but switching at least one direction. Also, the order may be switched every cycle T.
  • FIG. 4 is a configuration diagram of a first embodiment of the transmission unit in the base station.
  • the transmitting section 60 includes a broadcasting channel transmitting section 61 for transmitting broadcast data, an individual channel transmitting section 62 for transmitting individual channel user data, and an antenna element input signal output from a plurality of beamformers described later. It has a combiner 65 that adds and outputs each time. Although only one dedicated channel transmission unit is shown, there are actually many dedicated channel transmission units. ⁇
  • the broadcast channel transmitting section 61 includes a broadcast channel modulating section 63 and a beamformer 64 that generates fixed multi-beams of downlink in multiple directions (see broadcast CH # 0 to #N in FIG. 1). ⁇ 64N.
  • the spread modulator 63a of the broadcast channel modulator 63 spreads the broadcast data with the channelization code CC from the channelization code generator 63b, and the spread data to the beamformer 64. Enter ⁇ 64N.
  • Beamformer 64 0 ⁇ 64N is scrambled code generator 64a, respectively, spread modulation unit 64b, and a daisy barrel beamformer 64c.
  • Beamformer 64 The spread modulator 64b performs the spreading process on the output data of the broadcast channel modulator 63 using the scramble code SCO from the scramble code generator 64a. Digital beamformer 64c uses channelization code The broadcast data spread by the CC and scramble code SCO is subjected to beamforming so as to form the first multi-beam (see broadcast CH # 0 in Fig. 1), and the four antennas are used. Generate input signals to elements 51o-513.
  • the spread modulators of the beamformers 64i to 64N perform spread processing on the output data of the broadcast channel modulator 63 using the scramble codes SC1 to SCN from the scramble code generator.
  • the digital beamformer adds the multi-beam second to (N + 1) th beams to the broadcast data spread with the channelization code CC and the scramble codes SC1 to SCN (broadcast CH # 1 to CH # in Fig. 1).
  • the beamforming process is performed so as to form an input signal to the four antenna elements.
  • the scramble codes S C0 to SCN may all be different, but at least the scramble codes of adjacent beams may be different at least. In such a case, two types of scramble codes may be used. Use code.
  • the dedicated channel transmitter 62 performs adaptive beamforming processing on user data so as to direct a beam in the user direction and transmits the beam.
  • the transmission beamformer 6 ′ shown in the conventional example of FIG. It has a configuration combining parts ⁇ .
  • the dedicated channel transmitting section 62 performs spread modulation and transmit beam forming processing on user data to form four beams having directivity in the user direction (see dedicated CH # 0 in FIG. 1).
  • the signal is input to the antenna elements 51o to 513.
  • the individual channel transmitter 62 for only one user is shown. However, in practice, individual channel transmitters for a plurality of users are provided, and each user direction (individual CH # 1 to # 3) Form a beam with directivity according to.
  • Combining unit 65 the antenna element input signal to be output from the beam former 64 0 to 64 New and beamformer for each individual channel transmitting unit 62 synthesizes for each antenna element, the input to each antenna element (51 ⁇ 51 3) I do.
  • a fixed multi-beam (broadcast CH # 0 to #N) in the (N + 1) direction is formed for the downlink common channel, and the direction of each user is set for the downlink individual channel.
  • Beam (individual CH # 0 to # 3) is formed.
  • the orthogonal modulation is not shown, the orthogonal modulation , A frequency converter, a high-frequency amplifier and the like are provided.
  • a dedicated antenna for the broadcast channel is not required, and further, since the imbalance between the transmitters can be eliminated, the calibration can be easily performed.
  • the cell radius of both channels can be made the same. Also, by making the scramble code different according to adjacent beams, it is possible to prevent interference between adjacent broadcast channel signals.
  • FIG. 5 is a configuration diagram of a transmission / reception unit in a base station according to a second embodiment.
  • a beam is received by each of the uplink common channel and dedicated channel reception signals from each mobile station (user).
  • a configuration for forming is provided, and the same parts as those in the first embodiment are denoted by the same reference numerals.
  • the cell radius is made the same regardless of the uplink / downlink, the common channel / individual channel.
  • ⁇ Dapu Restorative array antenna reception sections (AAA reception section) 67 is composed of an AAA for the searcher unit 67 and the demodulator 67 2, AAA for searcher section 67 ⁇ a searcher .3 shown in FIG. 1 5 comprising a Dapute i Buu E wells ⁇ unit 4, the demodulator 67 2 has a despreading unit 5 and the beam former 6 and demodulator 7 shown in FIG. 1 5 as well.
  • the searcher unit 67 for AAA performs a correlation operation on each antenna element reception signal input via the transceiver 66 to determine the reception timing, and directs the reception beam toward the user.
  • demodulation unit 67 2 judges received data Ri by the reception beam based on the despread results to facilities despreading. Although only one user (one channel) AAA receiver is shown in Fig. 5, many AAA receivers are provided for each channel.
  • the searchers 68C to 68N for random access channel (RACH) using power rubbing in the third generation mobile communication have the same configuration, and each has a predetermined direction (one of N + 1 directions). It is designed to search for the reception timing of the transmitted random access channel preamble and calculate the received power.
  • RACH is an uplink common channel used, for example, when establishing a radio link between a base station and a mobile station.
  • the digital beamformer 68a receives the received signal of each antenna element and performs beamforming processing so as to direct the receiving direction in a predetermined direction (one of the (N + 1 directions)).
  • the inter-antenna combiner 68b combines the signals output from the beamformer 68a and outputs a beam signal from the predetermined direction.
  • the searcher 68c performs a correlation operation between the RACH spreading code and the received beam signal, detects the transmission timing of the preamble, and sets the detection timing to an unused demodulator.
  • the transmitting unit for AICH (not shown) spreads and modulates the AI (Acquisition Indicator) data, and then forms the beam so as to transmit the AI data in the predetermined direction.
  • FIG. 6 is a configuration diagram of the transmission section 60 including the transmission section 69 for AICH.
  • the transmission section 69 for AICH performs beamforming with the modulation section 69a for AICH that spreads and modulates AI data, and multiplexes the AI data.
  • a beamformer 69b for transmitting a beam in a predetermined direction is provided. The beamformer 69b can change the transmission beam direction by returning the weight coefficient.
  • the present invention is also applicable to the case of transmitting other uplink common channels, for example, a common packet channel.
  • the cell radius can be made the same regardless of whether the channel is up or down, a common channel, or an individual channel.
  • FIG. 7 shows a first modification of the second embodiment, in which the receiving beam direction of the uplink common channel is periodically swung clockwise, and the same parts as those in the second embodiment of FIG. Is attached.
  • the difference from the second embodiment is that only one searcher 68 for RACH is used, and the receiving beam direction of the AGH channel is periodically switched clockwise.
  • the digital beamformer 68d has a variable weighting factor, and rotates the receiving beam direction in an arbitrary direction by controlling the weighting factor.
  • the swing beam controller 68e is used to control the weight of the digital beamformer 68d. By controlling the number, the rotation of the receiving beam direction is continuously controlled in the (N + 1) direction.
  • the inter-antenna combiner 68f generates a received beam signal in a predetermined direction by combining the signals output from the beam former 68d, and outputs the generated signal.
  • the searcher 68g calculates the correlation between the RACH spreading code and the received beam signal, detects the transmission timing of the preamble, and sets the detection timing to an unused demodulator.
  • the transmission unit 69 for AICH spread-modulates the AI (Acquisition Indicator) data, and then directs the AI data in the predetermined direction.
  • the number of searchers for RACH that delays time T by one in signal transmission / reception compared to the first embodiment can be reduced to one, and the hardware configuration can be simplified.
  • FIG. 8 shows a second modification of the second embodiment, in which the receiving beam direction of the uplink common channel is randomly switched, and the same parts as those in the first modification are denoted by the same reference numerals.
  • the difference from the first modification is that swing beam control section 68h randomly swings the receive beam direction of the RACH channel.
  • the force for delaying the time T by one in the signal transmission and reception compared to the first embodiment can be reduced to one searcher for RACH, and the hardware configuration can be simplified.
  • FIG. 9 is a configuration diagram of a third embodiment of the transmission unit in the base station.
  • the common channel signal is prevented from interfering by changing the scramble code for each adjacent beam of the multi-beam.
  • common channel signals are prevented from interfering by changing the channelization code.
  • the transmitter 70 includes a broadcast channel transmitter 71 for transmitting broadcast data, an individual channel transmitter 72 for transmitting individual channel user data, and a signal for each antenna element output from a plurality of beamformers described later.
  • a combiner 73 that adds and outputs the signals, and a scramble link section 74 that spreads the input signal of each antenna element with a scramble code SC.
  • a scramble link section 74 that spreads the input signal of each antenna element with a scramble code SC.
  • the broadcast channel transmitter 71 transmits a plurality of downlink fixed multi-beams (the broadcast in FIG. 1).
  • Beamformer 75 The spread modulation unit 75a performs spread processing on the broadcast data using the channelization code CC0 from the channelization code generation unit 75b.
  • the digital beamformer 75c performs beamforming processing on the broadcast data spread by the channelization code CC0 so as to form the first multibeam (see broadcast CH # 0 in Fig. 1). , Four antenna elements 51. Generating an input signal to the to 51 3.
  • the spread modulators of the beamformers TS i TSw perform spread processing on the broadcast data using the channelization codes CC1 to CCN from the channelization and yord generator.
  • the digital beamformer adds the multi-beam 2nd to (N + 1) beams (multicast CH # 1 to CH # in Fig. 1) to the broadcast data spread by the channelization codes CC1 to CCN. performing beam forming processing to form the N reference), and generates an input signal to the four antenna elements 51o ⁇ 51 3.
  • the channelization codes CC1 to CCN may all be different, but at least only the adjacent beam channelization codes may be different. Uses a nerialization code.
  • the dedicated channel transmitter 72 performs adaptive beamforming processing on user data so as to direct a beam in the user direction and transmits the beam.
  • the transmission beamformer 6 ′ shown in the conventional example of FIG. It has a configuration in which a modulation section 7 'is combined. That is, dedicated channel transmitting section 72 spreads and modulates the user data with a predetermined channelization code, and adaptively executes transmission beamforming processing. As a result, four antenna element input signals are generated so as to form a beam having an orientation in the user direction (see individual CH # 0 in FIG. 1) and input to the antenna combining unit 73. You. Although FIG.
  • the combining unit 73 includes each beamformer 75.
  • Spreading circuit 74a 0 of Sukuranburi ring portion 74 it spreads the antenna element input signal AT0 scramble code generating unit 74b whether et onset of scrambled code SC, is inputted to the transmitting unit corresponding diffusion results to the antenna element 51Omikuron.
  • spreading circuit TAa t TAas spreads antenna element input signals AT1 to AT3 with scramble code SC from scramble code generating section 74b, and spreads the spreading result to a transmitting section corresponding to antenna element ⁇ ⁇ ⁇ . input.
  • the configuration between the spreading circuits 74a 0 ⁇ 74a 3 and the antenna elements not shown, the quadrature modulator, frequency Konpata, such as a high-frequency amplifier is provided.
  • a fixed multi-beam (broadcast CH # 0 to #N) in the (N + 1) direction is formed for the downlink common channel, and each user is assigned to the downlink individual channel. (Individual CH # 0 to # 3) are formed.
  • an antenna dedicated to a broadcast channel is not required, and further, imbalance between transmitters is suppressed, calibration can be easily performed, and furthermore, the broadcast channel and an individual channel are not used.
  • the cell radii of both channels can be equalized. Also, by making the channelization codes different according to adjacent multi-beams, interference between adjacent broadcast channel signals can be prevented.
  • the transmitting section 70 of the third embodiment can be used in place of the transmitting section 60 of FIGS. 5 and 7 to 8, and the same effects as those of FIGS. 5 and 7 to 8 can be obtained. You can play.
  • FIG. 10 is a configuration diagram of a fourth embodiment of the transmission unit in the base station.
  • a multi-beam of the downlink common channel is realized by providing a beamformer with the number of beams.
  • the beam direction formed by one beamformer is made to swing. Realize multiple beams. '
  • the transmitting section 80 is a broadcasting channel transmitting section 81 for transmitting broadcast data.
  • the broadcast channel transmitting section 81 includes a broadcast channel modulating section 84 and a beamformer 85 that forms a downlink multi-beam in a plurality of directions equivalently by swinging one beam.
  • the spread modulator 84a of the broadcast channel modulator 84 spreads the broadcast data with the channelization code CC from the channelization code generator 84b, and inputs the spread data to the beamformer 85.
  • the beamformer 85 includes a scramble code generator 85a, a spread modulator 85b, a digital beamformer 85c, and a swing beam controller 85d that swings the beam direction clockwise.
  • the digital beamformer 85c has a variable weighting factor, and by controlling the weighting factor, the receiving beam direction can be changed to any direction.
  • the swing beam control unit 85d controls the rotation of the transmission beam direction in the (N + 1) direction at a predetermined cycle by controlling the weight coefficient of the digital beamformer 85c.
  • Spreading modulator 85b spreads the output data of broadcast channel modulator 84 using scramble code SC from scramble code generator 85a.
  • the weight factor is initially set in the digital beamformer 85c so that a beam is formed in the first direction of the multi-beam (see broadcast CH # 0 in Fig. 2). Accordingly, at the initial stage, the digital beamformer 85c performs a beam forming process on the broadcast data spread by the channelization code CC and the scramble code SC so that the beam is directed in the first direction. Generates input signals to the four antenna elements 51o to 513. Thereafter, the swing beam control unit 85d controls the weight coefficient of the digital beamformer 85c at a predetermined cycle so as to continuously rotate in the direction (N + 1) of the transmission beam direction.
  • the digital beamformer 85c performs a beamforming process on the broadcast data, and generates input signals to the four antenna elements so that the beams are continuously directed in the (N + 1) direction.
  • the beam swing rotates the beam from a certain beam direction to an adjacent beam direction at every time t, swings the beam in all directions of (N + 1) at a cycle T, and thereafter repeats the above-mentioned beam swing at a cycle.
  • the dedicated channel transmitting section 82 performs an adaptive beam forming process on the user data so as to transmit the beam in the user direction.
  • the individual channel transmitter 82 has a configuration in which the transmission beamformer 6 ′ and the spread modulator 1 ′ shown in the conventional example of FIG.
  • FIG. 10 shows the transmission unit 82 for the dedicated channel of only one user, the transmission unit for the dedicated channel of a plurality of users is actually provided.
  • Synthesizing unit 83 synthesizes the antenna element input signal to be output from the Bimufu Oma beamformer 85 ⁇ Pi each individual channel transmitting unit 82 to the antenna element 51 0-51 every 3, via a transmission unit (not shown) the combined signal Input to each antenna element.
  • the transmitting section provided between the antenna combiner and each antenna element is composed of a quadrature modulator, a frequency converter, a high frequency amplifier, and the like.
  • beams (individual CH # 0 to # 3) directed to the direction of each user are formed for the downlink individual channel as shown in FIG. Also, for the downlink common channel, a beam in the first direction (broadcast CH # 0) is formed first, and thereafter, the beam direction is rotated clockwise at every cycle t, and all of (N + 1) at cycle T A beam is swung in the direction, and thereafter, the above-described beam swing is repeated in a cycle to form a multi-beam.
  • the beam of the common channel is formed by one beamformer, and the beam direction of the common channel is periodically changed by the swing control, as in the first embodiment.
  • the amount of hardware can be reduced compared to the method of forming multiple beams simultaneously using multiple beamformers.
  • code resources can be saved.
  • FIG. 11 is a configuration diagram of Embodiment 5 of the transmission / reception unit in the base station.
  • beamforming is performed on the reception signals of the uplink common channel and the dedicated channel from each mobile station (user).
  • the same components as those in the fourth embodiment shown in FIG. 10 are denoted by the same reference numerals.
  • an adaptive array antenna receiving section (AAA receiving section) 87 is composed of an AAA searcher section 87 ⁇ and a demodulator 87 2, and the AAA searcher section 87 ⁇ is a searcher shown in FIG.
  • Rereru demodulator 87 2 includes a despreading unit 5 and the beam former 6 and demodulator 7 shown in FIG. 1 5 as well.
  • the AAA for the searcher unit 87 iota both determined the received tie Mi ring performs correlation operation against the received signal of each A down antenna element 51o ⁇ 51 3 to enter the path through the transceiver 86, the reception beam the weights for directing the user direction is calculated, the demodulator 87 2 to facilities despreading the received signal, it determines the received data on the basis of the results of despreading.
  • Fig. 11 shows only one user (one channel) AAA receiver, multiple AAA receivers are provided for each channel.
  • the searchers 88O to 88N for the random access channel (RACH) using power wrapping in the third generation mobile communication have the same configuration, and each is sent from a predetermined direction (one of N + 1 directions). It searches for the reception timing of the preamble of the random access channel and calculates the received power.
  • digital beam former 8 8a is input to the reception signal of each antenna element 51o ⁇ 51 3, the reception direction by a predetermined direction by Uni beam directed to the (N + 1 direction in one direction of) A forming process is performed, and the inter-antenna combiner 88b combines the signals output from the beamformer 88a and outputs a received beam signal from the predetermined direction.
  • the searcher 88c calculates the correlation between the RACH spreading code and the received beam signal, detects the transmission timing of the preamble, and sets the detection timing to an unused demodulator. Also, when the detector 88c detects a brim, a transmission unit for AICH (not shown) (see FIG. 6) spread-modulates the AI (Acquisition Indicator) data, and then transmits the AI data in the predetermined direction.
  • the beamformer performs beamforming so that the signals are input to the antenna combiner 83, and the antenna combiner 83 combines the signals from the beamformer 85, the dedicated channel transmitter 82, and the AICH transmitter for each antenna. And output.
  • the present invention is also applicable to the case of transmitting other uplink common channels, for example, a common packet channel.
  • the cell radius can be the same irrespective of the uplink Z downlink, the common channel / individual channel.
  • FIG. 12 is a first modified example of the fifth embodiment, in which the receiving beam direction of the uplink common channel is periodically swung clockwise, and is the same as that of the fifth embodiment of FIG. Have the same reference numerals.
  • the difference from the fifth embodiment is that only one searcher 88 for RACH is used, and the receiving beam direction of the RACH channel is periodically swung clockwise.
  • the digital beamformer 88d has a variable weighting factor, and 'rotates the receiving beam direction in an arbitrary direction by controlling the weighting factor.
  • the swing beam control unit 88e controls the rotation of the receiving beam direction continuously in the (N + 1) direction by controlling the weighting factor of the digital beamformer 88d.
  • the inter-antenna combiner 88f combines the signals output from the beamformer 88d and outputs a beam signal from a predetermined direction.
  • the searcher 88g performs a correlation operation between the RACH spreading code and the received beam signal, detects the transmission timing of the preamble, and sets the detection timing to the unused demodulator 82.
  • AICH transmission section not shown (see FIG. 6) is spread modulates the AI (Acquisition Indicator) data., Then sends toward the AI data in the predetermined direction Then, the beamformer performs beamforming and inputs it to the antenna combiner 83, which combines the signals from the beamformer 85, the dedicated channel transmitter 82, and the AICH transmitter for each antenna. Output.
  • AI Application Indicator
  • the number of searchers for RACH that delays time T by one in signal transmission and reception compared to the fourth embodiment can be reduced to one and the hardware configuration can be simplified.
  • FIG. 13 shows a second modification of the fifth embodiment, in which the receiving beam direction of the uplink common channel is randomly switched, and the same parts as those in the first modification are denoted by the same reference numerals.
  • the difference from the first modification is that the swing beam control unit 88h randomly swings the receiving beam direction of the RACH channel.
  • the force for delaying the time T by one in the signal transmission / reception can be reduced to one searcher for RACH, and the hardware configuration can be simplified.
  • FIG. 14 is a configuration diagram of a sixth embodiment of the transmission / reception unit in the base station.
  • the force S for realizing a multi-beam by swinging the beam direction generated from one beam former clockwise is used.
  • the beam direction is randomly switched. This realizes a multi-beam.
  • the configuration of the sixth embodiment in FIG. 14 is similar to the configuration of the fifth embodiment in FIG. 10 except that the beam direction is changed instead of the swing control unit 85d that swings the beam direction clockwise. The point is that a random swing control unit '85e that swings at random is provided.
  • beams (individual CH # 0 to # 3) directed to the direction of each user are generated for the downlink individual channel.
  • a beam in the first direction (broadcast CH # 0) is formed, and thereafter, the beam direction is randomly rotated every period t, and the period T is (N + 1).
  • the beam is swung in all directions (multiple directions), and thereafter the above random beam swing is repeated at a period T.
  • one beamformer forms one beam of the common channel, and the beam direction of the common channel is randomly changed by random swing control.
  • the amount of hardware can be reduced as compared with the method of forming multiple beams simultaneously using a plurality of beamformers as in the first embodiment. Also, since it is not necessary to use a plurality of channelization codes and scramble codes, code resources can be saved and the configuration of the mobile station can be simplified.
  • the transmitting section 90 of the sixth embodiment can be used in place of the transmitting section 80 of FIGS. 11 to 13, and the same effects as those of FIGS. 11 to 13 can be obtained. I can do it.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Radio Transmission System (AREA)

Abstract

L'invention porte sur un appareil de communication AMCR présentant une fonction de formation de faisceau descendant. Un premier formateur de faisceau crée un faisceau adapté à la transmission de données d'un canal à plusieurs canaux une unité d'étalement du canal commun étale les données de transmission du canal descendant commun. Un deuxième formateur utilise les résultats de l'étalement pour former on ensemble fixe de plusieurs faisceaux descendants de direction différente. Une unité de synthèse synthétise chacun desdits résultats pour les différentes antennes d'un réseau d'antennes et les y injecte. On notera que pour éliminer les interférences entre faisceaux contigus on utilise des codes d'étalement différents pour les unités d'étalement de deux faisceaux contigus.
PCT/JP2002/010398 2002-10-07 2002-10-07 Appareil de communication en amcr WO2004032376A1 (fr)

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PCT/JP2002/010398 WO2004032376A1 (fr) 2002-10-07 2002-10-07 Appareil de communication en amcr

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3429302A4 (fr) * 2016-03-11 2019-10-09 Ntt Docomo, Inc. Station de base

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JPH09200115A (ja) * 1996-01-23 1997-07-31 Toshiba Corp 無線通信システムにおける無線基地局のアンテナ指向性制御方法および可変指向性アンテナ
JPH10173585A (ja) * 1996-12-06 1998-06-26 Hitachi Ltd 無線通信システム
JPH1188941A (ja) * 1997-09-05 1999-03-30 Ntt Mobil Commun Network Inc 移動通信のチャネル構成方法および移動通信システム
JPH11298400A (ja) * 1998-04-10 1999-10-29 Nec Saitama Ltd 適応アンテナの指向性制御回路及び指向性制御方法
JP2001268633A (ja) * 2000-03-23 2001-09-28 Nippon Telegr & Teleph Corp <Ntt> 無線通信システム・無線基地局・移動局
JP2001339758A (ja) * 2000-05-26 2001-12-07 Matsushita Electric Ind Co Ltd 無線基地局装置及び無線通信方法
JP2001339331A (ja) * 2000-05-26 2001-12-07 Matsushita Electric Ind Co Ltd 無線通信装置及び無線通信方法

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Publication number Priority date Publication date Assignee Title
JPH09200115A (ja) * 1996-01-23 1997-07-31 Toshiba Corp 無線通信システムにおける無線基地局のアンテナ指向性制御方法および可変指向性アンテナ
JPH10173585A (ja) * 1996-12-06 1998-06-26 Hitachi Ltd 無線通信システム
JPH1188941A (ja) * 1997-09-05 1999-03-30 Ntt Mobil Commun Network Inc 移動通信のチャネル構成方法および移動通信システム
JPH11298400A (ja) * 1998-04-10 1999-10-29 Nec Saitama Ltd 適応アンテナの指向性制御回路及び指向性制御方法
JP2001268633A (ja) * 2000-03-23 2001-09-28 Nippon Telegr & Teleph Corp <Ntt> 無線通信システム・無線基地局・移動局
JP2001339758A (ja) * 2000-05-26 2001-12-07 Matsushita Electric Ind Co Ltd 無線基地局装置及び無線通信方法
JP2001339331A (ja) * 2000-05-26 2001-12-07 Matsushita Electric Ind Co Ltd 無線通信装置及び無線通信方法

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3429302A4 (fr) * 2016-03-11 2019-10-09 Ntt Docomo, Inc. Station de base

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