WO2005011148A1 - ミリ波帯無線通信方法及びシステム - Google Patents
ミリ波帯無線通信方法及びシステム Download PDFInfo
- Publication number
- WO2005011148A1 WO2005011148A1 PCT/JP2003/009585 JP0309585W WO2005011148A1 WO 2005011148 A1 WO2005011148 A1 WO 2005011148A1 JP 0309585 W JP0309585 W JP 0309585W WO 2005011148 A1 WO2005011148 A1 WO 2005011148A1
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- WO
- WIPO (PCT)
- Prior art keywords
- band
- output
- receiving circuit
- component
- millimeter
- Prior art date
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Classifications
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- 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
- H04B1/06—Receivers
- H04B1/16—Circuits
- H04B1/22—Circuits for receivers in which no local oscillation is generated
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/06—Arrays of individually energised antenna units similarly polarised and spaced apart
- H01Q21/08—Arrays of individually energised antenna units similarly polarised and spaced apart the units being spaced along or adjacent to a rectilinear path
-
- 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
-
- 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
- H01Q3/30—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 varying the relative phase between the radiating elements of an array
-
- 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
- H04B7/0837—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 pre-detection combining
- H04B7/0842—Weighted combining
- H04B7/0845—Weighted combining per branch equalization, e.g. by an FIR-filter or RAKE receiver per antenna branch
Definitions
- an RF band modulated signal transmitted from a transmitter and a local oscillation signal having a coherent phase noise characteristic are received together by a receiver, and a product component of the two components is generated.
- the present invention relates to a millimeter wave band wireless communication method and system for restoring an IF band transmission source signal. Background art
- the radio modulation signal is obtained by multiplying the intermediate frequency band signal (IF) and the local oscillation signal (L0) and up-comprising. (RF) generation and transmission, and a receiver that has the function of generating an IF by receiving RF, multiplying L0, and down-converting it. It is.
- the IF input to the transmitter and the IF generated by the receiver have a predetermined frequency difference relationship, and the time variation of the phase difference is small. Is required.
- a local oscillator that has excellent frequency stability and low phase noise is required as a local oscillator that generates L0 in the transceiver.
- the dielectric resonator or PLL (Phase Lock Loop) circuit stabilizes and reduces noise.
- the operating frequency increases (for example, in the millimeter wave band of 30 GHz or more), it becomes more difficult to realize a stable and low-noise oscillator, and the manufacturing cost increases.
- the Q value Quality Factor
- the configuration of a frequency divider becomes difficult.
- a wireless communication device self-heterodyne system
- the IF modulation signal of the data input to the transmitter 81 is multiplied by the local oscillation signal (L0) of the local oscillator 85 by the mixer 83, and the unnecessary wave component is removed by the bandpass filter 86.
- a radio modulation signal RF
- a part of L0 of this RF is added by the power combiner 87.
- the added radio signal is transmitted from the antenna Tx after the signal level is increased by the amplifier 88.
- the radio signal received by the antenna Rx is increased in signal level by the amplifier 91, filtered by the filter 92 in the receiver, and demodulated by the squarer 93 to IF.
- the same L0 used to generate the RF signal is transmitted as a wireless signal. Therefore, the effect of the phase noise of the local oscillator 85 serving as the L0 source is canceled during demodulation, and the demodulated IF is demodulated to the original IF frequency input to the transmitter.
- Japanese Patent Application Laid-Open No. 2002-2466921 separates a transmission IF modulated signal by a frequency interval equivalent to an IF frequency that is appropriate when demodulating this signal on a receiving side.
- a transmission circuit in which unmodulated carriers are mixed at positions, and these are combined and up-converted to a millimeter wave band using a millimeter wave band local oscillation signal. Disclosure of the invention
- a high-gain antenna when a high-gain antenna is realized at a high frequency such as a millimeter wave band, it can be realized by arranging a plurality of antenna elements in an array and synthesizing the signals obtained by the antenna elements in phase (this is called an array antenna).
- the present invention solves the above-mentioned problems, constructs a low-cost wireless communication system, not only enables high-quality signal transmission, but also manufactures a wide-beam antenna with high gain and ease of use. It is intended to make it possible.
- the receiver receives the RF band modulated signal transmitted from the transmitter together with the unmodulated carrier having the coherent phase noise characteristic, and generates the product component of the two components to obtain the IF band. Recovers the transmission source signal, but receives a single unit including a small planar antenna with a wide beam characteristic, such as a one-element patch antenna, and an amplifier and mixer circuit generated on a micro planar circuit by MMIC technology. After arranging a plurality of circuits on the receiver that are sufficiently shorter than the wavelength in the IF band, and combining the detection outputs of each unit receiver circuit with power, the circuit functions as a high-gain antenna with a detection function. In addition, it is characterized in that it can achieve the same wide beam radiation characteristics as a one-element antenna.
- the millimeter-wave band wireless communication method and system include a receiving circuit combining a small receiving antenna and a planar receiving circuit as one component, and the receiving circuit serving as one component is sufficiently compared with the IF band wavelength.
- a plurality of short-circuited outputs are combined, the detection outputs detected by the individual receiving circuits are combined, an IF band combined output is output, and the IF band combined output is input and demodulated. Then, before combining with the IF band combined output, phase adjustment and amplitude weighting are performed on the detected output detected by each receiving circuit.
- FIGS. 1 (A) and 1 (B) are diagrams illustrating a basic configuration of a transmission / reception circuit of a wireless communication system embodying the present invention.
- FIG. 2 is a diagram illustrating a transmitter configuration.
- FIGS. 3 (A) and 3 (B) are diagrams exemplifying a receiver configuration in which a micro planar circuit is configured by a planar printed antenna and MMIC technology.
- FIG. 4 is a diagram showing a receiving circuit (embodiment 1) that embodies the basic configuration shown in FIG.
- FIG. 5 is a diagram showing a receiving circuit (Embodiment 2) that embodies the basic configuration shown in FIG.
- FIG. 6 (A) and 6 (B) are diagrams showing a receiving circuit (embodiment 3) which embodies the basic configuration shown in FIG.
- FIG. 7 is a diagram for explaining the interval adjustment of the system by taking, as an example, a case where two elements of each unit receiving circuit are used.
- FIG. 8 is another diagram for explaining the interval adjustment of the system by taking, as an example, a case where two elements of each unit receiving circuit are used.
- FIG. 9 is a diagram for explaining a wireless communication device (self-heterodyne system) of the prior art.
- FIG. 1 is a diagram illustrating a basic configuration of a transmission / reception circuit of a wireless communication system embodying the present invention, in which (A) shows a transmission side and (B) shows a reception side.
- the transmitting side is composed of a self-heterodyne or pilot-inserted millimeter-wave transmitting circuit, and transmits a millimeter-wave band modulated signal and an unmodulated signal in which the phase noise component and the frequency offset component are synchronized.
- signals received by multiple small receiving antennas are amplified by an amplifier, unwanted wave components are removed by a band-pass filter BPF, amplified again, and detected by a mixer circuit that functions as a square circuit. .
- the signals are combined in multiple stages using a plurality of combining circuits, and finally the power is combined as one IF band combined output, and is passed to the IF band demodulating circuit.
- FIG. 2 is a diagram illustrating a transmitter configuration.
- Millimeter-wave transmitter 1 is local oscillator 2
- the IF band modulated signal output from the IF signal generator 4 is input to the mixer 3 to which the obtained local oscillation signal is input, and unnecessary band components are removed by the bandpass filter 5 to reduce the radio frequency (RF )
- RF radio frequency
- a band modulation signal is obtained.
- the signal is amplified by the amplifier 6 and transmitted from the transmission antenna 7.
- a signal in which a local oscillation signal having a coherent phase noise characteristic with the RF band modulation signal is transmitted from the transmitter.
- FIG. 3 is a diagram exemplifying a configuration of a receiver in which a micro planar circuit is configured by a planar printed antenna and a micro IC technology.
- A illustrates the overall configuration of the receiver
- B illustrates details of the configuration of the receiving antenna and detector.
- the signal transmitted from the transmitter is received and detected by the receiving antenna & detector 9 and its output is input to the IF signal demodulator 10 to demodulate the received data.
- a plurality of basic unit receiving circuits 11 are arranged in the receiving antenna & detection unit 9, and each of these unit receiving circuits (antennas) 11 is arranged sufficiently short compared to the IF band wavelength. Further, the basic unit receiving circuit 11 is composed of a planar print antenna 12 such as a patch antenna, an amplifier circuit 13 generated in a minute planar circuit by the IC technology, and a mixer circuit 14 functioning as a squarer. Then, the output of each basic unit receiving circuit is power-combined and passed to the IF signal demodulation unit.
- Each unit receiving circuit 11 can be miniaturized using MM IC technology including an antenna, and it does not need to incorporate an oscillator. Since the IF signal obtained at the output is synchronized in phase and frequency, combining diversity can be easily realized by combining the signals. In addition, since this synthesis circuit is a synthesis circuit in the IF band, it does not require accuracy in the order of millimeter wavelength.
- a signal received in a millimeter-wave band (frequency f rf ) communication system has a millimeter-order wavelength (i rf ). Therefore, when arranging multiple antennas in a receiver, receiving them, and combining the outputs of the receivers, unless the antennas are arranged at a sufficiently small interval than this very short wavelength, the incoming wave On the other hand, even if the receiver receives the signal at a slight angle, there is a slight time difference ⁇ in the arrival time at each receiving antenna, which appears as a large phase difference of 2 f rf A ⁇ before combining. .
- the system according to the present invention transmits a coherently related radio modulation signal (frequency f rf ) and an unmodulated carrier (frequency) together, and square-detects this to detect the difference frequency.
- a coherently related radio modulation signal frequency f rf
- an unmodulated carrier frequency
- these are combined. Therefore, the difference ⁇ in the arrival times between the different antennas occurs equally in both the transmitted radio modulated signal and the non-modulated carrier, and as a result, the inherent millimeter wave between the receiving circuits is generated.
- the phase difference for the band signal is canceled after detection.
- phase difference 2 ⁇ (f ri ⁇ ) ⁇ ⁇ 2 f if ⁇ ⁇ corresponding to the wavelength in the IF band appears before the detection.
- the receiving antenna spacing should be set sufficiently close (for example, ⁇ / 20 or less) to the IF band wavelength 50cm. It is easy to do.
- the phase difference 2 f if A generated between the different receiving circuit outputs can be regarded as almost 0, which is favorable. It is possible to obtain a good reception gain characteristic.
- FIG. 4 is a diagram showing a receiving circuit (embodiment 1) that embodies the basic configuration shown in FIG.
- the reception beam pattern can be controlled by synthesizing the IF outputs after performing the phase adjustment and the amplitude weighting on each IF output.
- each IF output passes through a variable phase shifter and a variable attenuator, and is power-synthesized by a synthesizer.
- the variable phase shifter i3 adjusts the phase based on the phase control signal
- the variable attenuator (variable ATT) weights the amplitude based on the amplitude control signal.
- an array antenna and an adaptive array capable of receiving only a signal in a certain direction of arrival or, conversely, a receiving beam waveform for removing only an interference wave signal in a certain direction of arrival can be obtained.
- the antenna can be easily realized in the millimeter wave band.
- the wavelength is so short that very fine precision is required for phase control. This can be achieved. That is, it can be realized by using the adaptive array antenna technology realized in the microwave band, so that the cost can be easily reduced.
- FIG. 5 is a diagram showing a receiving circuit (Embodiment 2) that embodies the basic configuration shown in FIG.
- three or more unit receiving circuits (receiving antennas) are not arranged at equal intervals but arranged irregularly, for example, at prime intervals or logarithmic distribution intervals. Even if two or more receiver circuits are arranged, if the intervals are regular, signal fading always occurs under certain conditions (distance and height between millimeter wave transceivers). Therefore, signal phasing can be prevented in most cases by using three or more and making the intervals irregular.
- FIG. 6 is a diagram showing a receiving circuit (Embodiment 3) which embodies the basic configuration shown in FIG.
- the receiver configuration shown in (A) is duplicated only in a certain direction on the circuit arrangement plane. Instead of arranging several unit circuits, they are arranged in a direction different from this by 90 ° (horizontal direction and vertical direction), that is, in a two-dimensional direction, and their outputs are combined.
- multipathing occurs not only in the vertical or horizontal direction, but also in both directions. Therefore, by arranging as shown in the figure, it is possible to avoid multipath fading occurring in all directions.
- the receiver is arranged in a two-dimensional or three-dimensional manner as in the third embodiment shown in FIG. 6, and the respective outputs are combined.
- the antenna used in the transmission circuit circularly polarized, the reception di-parity effect is effective in all directions of the transceiver.
- FIG. 7 is a diagram for explaining the interval adjustment of the system by taking, as an example, a case where two elements of each unit receiving circuit are used.
- Each unit receiving circuit is fixed to a rail or the like by screwing, etc., and if necessary, the interval can be changed continuously or stepwise by manual adjustment. This makes it possible to install and use wireless terminals at antenna intervals suitable for the assumed communication environment.
- FIG. 8 is also a diagram for explaining the adjustment of the system interval, taking as an example the case where two elements of each unit receiving circuit are used.
- the remaining boards are rail-mounted via a moving mechanism such as a motor.
- the motor is configured to be controlled by a power detection and motor control unit. Further, the power detection and motor control unit detects the signal output power after the synthesis by the synthesis circuit, and controls the motor based on the detection signal.
- This control automatically adjusts the distance between the substrates so that the signal output power after the synthesis by the synthesis circuit becomes the maximum value within the movable range of the unit reception circuit when the adjustment mechanism is reset or constantly. to this Therefore, it is possible to obtain a diversity reception effect effectively under all conditions without manual adjustment and with a small number of unit receiving circuits.
- the transmitter can use a low-cost local oscillator having unstable frequency and large phase noise, and the receiver can use the local oscillator itself. Since it is not required, a very low-cost wireless communication system can be constructed, and the above-mentioned instability of the frequency is canceled at the time of detection, so that high-quality signal transmission is possible. (Effect of self-heterodyne method)
- in-phase synthesis of signals obtained by each antenna element of the array can be performed in an IF band sufficiently lower than the radio frequency, so that wiring and processing accuracy for in-phase synthesis are not so much required and can be easily realized. It is possible.
- the basic unit receiving circuits can be arranged very close to each other, and the phase difference of the received signal in the RF band between the antenna elements of the array is almost negligible at the detection output point of each receiving circuit. Therefore, a very wide beam and high gain receiving antenna close to the angle-to-relative gain characteristic of a one-element antenna can be realized.
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
- Radio Transmission System (AREA)
- Transceivers (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN038268671A CN1820429B (zh) | 2003-07-29 | 2003-07-29 | 毫米波段无线通信方法和系统 |
JP2005504583A JPWO2005011148A1 (ja) | 2003-07-29 | 2003-07-29 | ミリ波帯無線通信方法及びシステム |
EP03817655A EP1650884A4 (en) | 2003-07-29 | 2003-07-29 | METHOD AND SYSTEM FOR WIRELESS COMMUNICATION IN THE MILLIWAVE RIBBON |
US10/563,940 US7599672B2 (en) | 2003-07-29 | 2003-07-29 | Millimeter-wave-band radio communication method in which both a modulated signal and an unmodulated carrier are transmitted to a system with a receiver having plural receiving circuits |
PCT/JP2003/009585 WO2005011148A1 (ja) | 2003-07-29 | 2003-07-29 | ミリ波帯無線通信方法及びシステム |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2003/009585 WO2005011148A1 (ja) | 2003-07-29 | 2003-07-29 | ミリ波帯無線通信方法及びシステム |
Publications (1)
Publication Number | Publication Date |
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WO2005011148A1 true WO2005011148A1 (ja) | 2005-02-03 |
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Application Number | Title | Priority Date | Filing Date |
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PCT/JP2003/009585 WO2005011148A1 (ja) | 2003-07-29 | 2003-07-29 | ミリ波帯無線通信方法及びシステム |
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US (1) | US7599672B2 (ja) |
EP (1) | EP1650884A4 (ja) |
JP (1) | JPWO2005011148A1 (ja) |
CN (1) | CN1820429B (ja) |
WO (1) | WO2005011148A1 (ja) |
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Also Published As
Publication number | Publication date |
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CN1820429A (zh) | 2006-08-16 |
JPWO2005011148A1 (ja) | 2006-10-05 |
CN1820429B (zh) | 2010-10-06 |
US20060160514A1 (en) | 2006-07-20 |
EP1650884A4 (en) | 2011-08-10 |
EP1650884A1 (en) | 2006-04-26 |
US7599672B2 (en) | 2009-10-06 |
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