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WO1999035772A1 - Procede de transmission en parallele - Google Patents

Procede de transmission en parallele Download PDF

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Publication number
WO1999035772A1
WO1999035772A1 PCT/JP1999/000022 JP9900022W WO9935772A1 WO 1999035772 A1 WO1999035772 A1 WO 1999035772A1 JP 9900022 W JP9900022 W JP 9900022W WO 9935772 A1 WO9935772 A1 WO 9935772A1
Authority
WO
WIPO (PCT)
Prior art keywords
transmission method
parallel transmission
carriers
carrier
spectrum
Prior art date
Application number
PCT/JP1999/000022
Other languages
English (en)
Japanese (ja)
Inventor
Yasunori Suzuki
Toshio Nojima
Original Assignee
Ntt Mobile Communications Network Inc.
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 Ntt Mobile Communications Network Inc. filed Critical Ntt Mobile Communications Network Inc.
Priority to CA002285198A priority Critical patent/CA2285198C/fr
Publication of WO1999035772A1 publication Critical patent/WO1999035772A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/02—Channels characterised by the type of signal
    • H04L5/06—Channels characterised by the type of signal the signals being represented by different frequencies
    • 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
    • H04B7/0848—Joint weighting
    • H04B7/0857—Joint weighting using maximum ratio combining techniques, e.g. signal-to- interference ratio [SIR], received signal strenght indication [RSS]

Definitions

  • the present invention relates to parallel transmission when performing wireless communication of a plurality of different baseband signals using a plurality of carriers, and particularly to a parallel transmission method suitable for land mobile communication.
  • adaptive modulation scheme for selecting an optimum modulation scheme in accordance with the situation of the transmission line broadband CD MA, such as applying force? OFDM scheme being considered is known as digital broadcasting.
  • the high-speed and high-quality transmission systems described above use a single spectrum that is divided into multiple carriers, or a wideband single carrier that uses error correction technology and diversity reception technology.
  • a radio circuit having the required frequency characteristics over a wide band and a processor for performing advanced digital signal processing were required.
  • wireless circuits such as filters and transmission power amplifiers and processors such as error correction decoders.
  • This wireless circuit technology includes, in particular, the out-of-band attenuation characteristics of the filter and the transmission. Improving the linearity of the system is essential.
  • Advanced circuit technology was required to realize high-speed transmission and high-quality transmission, and to realize a wireless communication system with high frequency use efficiency.
  • the modulation is QPSK: and the roll-off filter coefficient is 0.5 in order to transmit 10 Mbps information
  • the frequency bandwidth is required to be 7.5 MHz. If this is transmitted on a single carrier, the passband (3 dB bandwidth) of the receive filter used in the radio is 4.6 MHz. If the mobile station needs an adjacent channel attenuation of 80 dB so as not to receive the adjacent channel interference with the adjacent carrier, the reception filter needs a wide pass bandwidth and a steep attenuation characteristic. If a small and lightweight radio is to be made, it will be necessary to develop a small filter with higher performance than before.
  • a single spectrum is divided into a plurality of carriers, and error correction technology and diversity reception technology are combined into a wideband single carrier.
  • error correction technology and diversity reception technology are combined into a wideband single carrier.
  • a radio circuit with wideband frequency characteristics and a processor that performs advanced digital signal processing were required.
  • an object of the present invention is to solve the above-mentioned problem, and using an existing circuit technology, the frequency of each of a plurality of carriers is adjusted so that the frequency interval is equal to or greater than or close to a coherent bandwidth.
  • the parallel transmission method of the present invention is a parallel transmission method for performing wireless communication of M (integral with M> 1) different baseband signals using M carrier waves, wherein each of the M carrier waves is The communication is performed by setting the interval between these frequencies to be equal to or greater than the coherent bandwidth or near the coherent bandwidth.
  • M or less different modulation methods can be used for the M carrier waves.
  • the M or less different modulation methods may be a combination including at least one of PSK :, QAM, or FSK.
  • the combination of these PSK :, QAM and FSK modulation methods may be each combination or a combination of different multi-level numbers of each modulation method.
  • the M or less different modulation schemes can be selected from QAM, PSK, FSK and their respective multi-level numbers.
  • the parallel transmission method of the present invention by using the existing circuit technology, communication is performed by setting the interval between the frequencies of a plurality of carriers to be equal to or more than the coherent bandwidth.
  • a parallel transmission method capable of realizing high-speed transmission and high-quality transmission that does not require a radio circuit having wideband frequency characteristics and a processor that performs advanced digital signal processing.
  • FIG. 1 is a diagram showing an embodiment in which the frequency interval is set to be equal to or more than the coherent bandwidth. It is.
  • FIG. 2 is a diagram showing an embodiment in which the frequency interval is set near the coherent bandwidth.
  • FIG. 3 is a diagram showing an embodiment using a plurality of modulation methods.
  • FIG. 4 is a diagram showing another embodiment using a plurality of modulation methods.
  • FIG. 5 is a diagram showing an embodiment using carriers at frequency intervals standardized by PDC.
  • FIG. 6 is a diagram showing an embodiment in which the present invention is applied to broadcast communication.
  • FIG. 7 is a diagram showing an embodiment when voice and data transmission coexist.
  • FIG. 8 is a diagram illustrating a configuration example of a transmitter used in the present invention.
  • FIG. 9 is a diagram showing another configuration example of the transmitter used in the present invention.
  • FIG. 10 is a diagram showing a configuration example of a receiver used in the present invention. BEST MODE FOR CARRYING OUT THE INVENTION
  • the frequency correlation value between each carrier used is set to a certain fixed value or less.
  • the frequency correlation value between the carrier waves is set to a frequency interval equal to or more than the coherent band in which the carrier waves can be regarded as substantially uncorrelated.
  • the frequency correlation value p ( ⁇ ) is expressed as ⁇ 1 and ⁇ 1 + ⁇ for the frequencies of the two fading received waves, ⁇ It is known that if the length of the shortest propagation path is ⁇ 0 and the speed of light is c, equation (1) is obtained.
  • the frequency interval ⁇ at which I p ( ⁇ ) I is 0.5 is defined as the coherent bandwidth.
  • the frequency interval Omega regarded substantially uncorrelated typically are force? Known to be a p ( ⁇ ) ⁇ 0. 5 ⁇ .
  • the parallel transmission method of the present invention even if some carriers do not have a predetermined line quality due to fluctuations in propagation paths such as fusing, deterioration of the line quality of the entire wireless line can be avoided. For this reason, the parallel transmission method of the present invention maintains the transmission capacity while maintaining the transmission capacity as compared with the conventional parallel transmission method in which a plurality of carriers are made into a single spectrum such as the conventional frequency division multiplexing (FDM). Less affected by the degradation of line quality on the transmission line.
  • FDM frequency division multiplexing
  • a radio circuit embodying the present invention can be realized by having a plurality of radio circuits having different local oscillation frequencies. This eliminates the need for a filter with a wide passband, which was required in the conventional parallel transmission method.
  • the linearity of the radio circuit need only be achieved for each independent radio circuit, and does not require the wideband linearity required in conventional radio circuits for parallel transmission methods.
  • Processors that perform digital signal processing can also use processors with lower processing power by using almost independent narrowband carriers. This contributes to lower power consumption of digital circuits.
  • FIG. 8 shows a configuration example of a transmitter used in the parallel transmission method of the present invention.
  • baseband signals processed by a plurality of baseband processing units 800, 805,..., 810 are DZA-converted by 07-oct converters 820, 825,.
  • the orthogonal transform is performed by the devices 840, 845,.
  • the intervals of the respective frequencies ff 2 ,..., F N are set so as to be substantially equal to each other or equal to or less than the coherent bandwidth.
  • Parallel transmission method Fi by the controller 8 8 0 by law, f 2, ⁇ , intervals of the frequency f N is Kohi -.. Is set to more than Les cement bandwidth.
  • the signal is multiplexed by a signal multiplexer 890, amplified by a transmission power amplifier 895, and transmitted via an antenna 899.
  • FIG. 9 shows another configuration example of the transmitter used in the parallel transmission method of the present invention.
  • ff 2,... Approximately equal intervals between the frequency of the I New, had been set below the coherent bandwidth
  • the controller 9 2 With 0, the intervals of the frequencies f ⁇ , f 2,..., F N are set to be equal to or greater than the coherent bandwidth.
  • FIG. 10 shows a configuration example of a receiver used in the parallel transmission method of the present invention.
  • the radio waves received by antennas 100 and 105 are transmitted to the receiving amplifiers 100 and 125 detected by the level detectors 111 and 115.
  • the output is switched to the higher reception level ANT 1 00 0, 1 0 5 by the controller 1 1 0 0, and the frequency fi, f by the controller 1 04 0 by the frequency converter 1 3 0, 1 3 5 Converted to 2.
  • the bandpass filters BPF
  • the automatic gain control Automatic Gain Control: AGO 1 0 60, 1 065
  • the detector 1 0 7 0, Detector 1 0 7 5 A / D conversion by AZD converters 1 0 8 0, 1 0 8 5, Judgment 1 0 9 5 Is input to
  • FIG. 1 shows an embodiment in which the frequency interval is set to be equal to or larger than the coherent bandwidth, in which the vertical axis is the spectrum axis 100 and the horizontal axis is the frequency axis 110.
  • the vertical axis is the spectrum axis 100 and the horizontal axis is the frequency axis 110.
  • Fig. 1 A parallel transmission method including the transceiver shown as an example and transmitting three different pieces of information between the radio station 130 and the radio station 140 using three carriers will be described.
  • the frequency intervals 120 and 125 of the spectra 11 1, 1 12 and 113 by three carriers are set to be equal to or larger than the coherent bandwidth (1 15).
  • the spectrums 111, 112, and 113 of the three carriers in FIG. 1 undergo fusing almost uncorrelated with each other. Therefore, even if the spectrum 1 12 due to the second carrier is fuzzed during a call and the line quality is degraded, the spectra 1 1 1 and 3 due to the remaining 1st carrier are obtained. It is possible to continue the call by spectrum 113 with the th carrier. In other words, on the receiver side, as shown in FIG.
  • the spectrum 11 1 of the first carrier and the spectrum 113 of the third carrier are synchronously detected, and after the detection by the detectors 1070 and 1075, Combine at maximum ratio. At this time, since each carrier can be regarded as almost independent, diversity reception of 2-branch maximum ratio combining is possible.
  • FIG. 2 shows an embodiment in which the frequency interval is set near the coherent bandwidth, in which the vertical axis is the spectrum axis 100 and the horizontal axis is the frequency axis 110.
  • FIG. 2 illustrates a parallel transmission method for transmitting three different pieces of information between the wireless station 130 and the wireless station 140 using three carriers.
  • the frequency intervals 220, 225 of the spectrums 211, 212, 213 by the three carriers in FIG. 2 are set near the coherent bandwidth (215).
  • this setting (2 15) the spectrums 211, 212, and 213 of the three carriers in FIG. 2 undergo fusing almost uncorrelated with each other. Therefore, even if the spectrum 212 due to the second carrier is fading during a call and the line quality is degraded, the spectrum 2111 due to the remaining first carrier and the spectrum due to the third carrier are used. Call 2 13 allows you to continue the call.
  • the spectrum with the first carrier and the spectrum with the third carrier are used. Synchronous detection of spectrum 2 13 is performed, and maximum ratio combining is performed after detection by detectors 1070 and 1075. At this time, since the carrier waves can be regarded as almost independent, diversity reception of 2-branch maximum ratio combining is possible.
  • FIG. 3 shows an embodiment using a plurality of modulation methods, in which the vertical axis is spectrum axis 100 and the horizontal axis is frequency axis 110.
  • FIG. 3 illustrates a parallel transmission method for transmitting three different pieces of information between a wireless station 130 and a wireless station 140 using three carriers.
  • the modulation schemes of the spectrums 311, 312, and 313 using three carriers are QP SK, 16 QAM, and FSK.
  • the frequency intervals 320, 325 of the spectra 311, 312, 313 by three carriers are set to be equal to or greater than the coherent bandwidth (315). With this setting (3 15), the spectra 311, 312, and 313 of the three carriers in FIG. 3 receive almost uncorrelated fusing.
  • the spectrum 3 11 due to the first carrier and the spectrum 3 13 due to the second carrier 2 allows the call to continue.
  • Information to be originally transmitted in the vector 3 13 by the third carrier can be distributed to the spectrum 3 12 by the second carrier.
  • the spectrum 312 using the second carrier uses 16 QAM.
  • FIG. 4 shows an embodiment using a plurality of modulation methods, in which the vertical axis is spectrum axis 100 and the horizontal axis is frequency axis 110.
  • FIG. 4 illustrates a parallel transmission method for transmitting three different pieces of information between the wireless station 130 and the wireless station 140 using three carriers.
  • the modulation schemes of the spectrums 4 11, 4 12, and 4 13 using three carriers are QP SK, 16 QAM, and 16 QAM.
  • Spectrum with four carriers 411, 412, and 413 frequency intervals 420 and 425 are coherent bands Set near the width (4 1 5). With this setting (4 15), the spectra 4 11 1, 4 12 and 4 13 of the three carriers in FIG. 4 undergo almost uncorrelated fading.
  • the modulation schemes of P SK :, 0 8] ⁇ 1 and 3 used in the above embodiment may be a combination of each, or a combination of multi-valued numbers of the respective modulation schemes.
  • multi-level numbers may be used for each carrier.
  • 16QAM QP SK, and 4F SK.
  • 256 QAM, 16 QPS :, or 64 QAM.
  • FIG. 5 shows an embodiment using carriers with frequency intervals standardized by PDC, in which the vertical axis is the spectrum axis 500 and the horizontal axis is the frequency axis 510.
  • Figure 5 has four times the transmission capacity of PDC. If the spectrum per carrier is 11.2 kbps, a transmission capacity of 44.8 kbps can be obtained. As described above, the parallel transmission method using the present invention is effective for high-speed transmission.
  • FIG. 6 shows an embodiment in which the parallel transmission method of the present invention is applied to a broadcast service, in which the vertical axis is a spectrum axis 600 and the horizontal axis is a frequency axis 610.
  • FIG. 6 illustrates a parallel transmission method between a wireless station 630 and a wireless station 640 using spectra 611, 612, 613, and 614 with four different carriers.
  • the modulation scheme of the channels 612, 613, and 614 used in the downlink 650 may be the modulation scheme of the voice channel or another modulation scheme.
  • a user can receive a broadcast service through downlink 650 while performing voice communication, for example, a PDC call, using his or her mobile device.
  • voice communication for example, a PDC call
  • you can receive services similar to the Intelligent Tutoring System (ITS) represented by power navigation, etc. (for example, traffic jam information, weather forecasts, various news services, etc.).
  • ITS Intelligent Tutoring System
  • different line capacities and reliability can be set for the upstream 655 and downstream 650.
  • FIG. 7 shows an embodiment in which voice and data transmission coexist, in which the vertical axis represents the spectrum axis 700 and the horizontal axis represents the frequency axis 710.
  • FIG. 7 illustrates a parallel transmission method between a wireless station 730 and a wireless station 740 using spectra 711, 712, and 713 with three different carriers.
  • the modulation scheme of each channel is QPSK for channel 711, s'l6 QAM for channel 712, and FSK for channel 713.
  • the modulation scheme of each channel is 16 QAM for channel 751, QPSK for channel 752, and FSK for channel 753.
  • PDC for voice and to perform overnight transmission using 16 QAM modulation.
  • the parallel transmission method of the present invention can flexibly realize services with different required line qualities, such as voice and data transmission, using the same transmission method.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Radio Transmission System (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Les intervalles (120, 125) entre les spectres (11, 112, 113) d'ondes porteuses sont supérieurs à la largeur de bande cohérente, ou voisins de celle-ci, de sorte que les ondes porteuses peuvent recevoir des mises en phase corrélatives mutuelles. Il s'ensuit que dans le cas où le spectre (112) reçoit une mise en phase par une onde porteuse spécifique au cours d'une communication, et que la qualité de la ligne s'en trouve dégradée, la communication peut être poursuivie au moyen des autres spectres (11, 113). Dans ce cas, les autres signaux reçus sont détectés de manière synchrone et combinés par une méthode composite de rapport maximum, de sorte que les porteuses peuvent être considérées indépendamment les unes des autres. De cette façon, il est possible d'obtenir une diversité de réception selon une méthode composite de rapport maximum pour les branchements dont le nombre est égal au nombre de porteuses utilisées pour la communication. Du fait que les intervalles entre les fréquences sont réglés en utilisant des techniques de circuits existantes, de telle façon que les porteuses soient presque mutuellement en corrélation, aucun circuit radio à caractéristiques de fréquence large bande, ni processeur pour traitement de signaux numériques à degré élevé n'est nécessaire.
PCT/JP1999/000022 1998-01-09 1999-01-07 Procede de transmission en parallele WO1999035772A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CA002285198A CA2285198C (fr) 1998-01-09 1999-01-07 Procede de transmission en parallele

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP00352598A JP3507683B2 (ja) 1998-01-09 1998-01-09 並列伝送方法
JP10/3525 1998-01-09

Publications (1)

Publication Number Publication Date
WO1999035772A1 true WO1999035772A1 (fr) 1999-07-15

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PCT/JP1999/000022 WO1999035772A1 (fr) 1998-01-09 1999-01-07 Procede de transmission en parallele

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JP (1) JP3507683B2 (fr)
CA (1) CA2285198C (fr)
WO (1) WO1999035772A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6545990B1 (en) * 1999-12-20 2003-04-08 Tantivy Communications, Inc. Method and apparatus for a spectrally compliant cellular communication system
US8463255B2 (en) 1999-12-20 2013-06-11 Ipr Licensing, Inc. Method and apparatus for a spectrally compliant cellular communication system
US6660226B1 (en) * 2000-08-07 2003-12-09 Murata Manufacturing Co., Ltd. Lead free solder and soldered article
WO2008108366A1 (fr) * 2007-03-06 2008-09-12 Mitsubishi Electric Corporation Système de communication radio
JP5348042B2 (ja) * 2010-03-26 2013-11-20 富士通株式会社 マルチキャリア通信方法及びマルチキャリア通信システム及びそれに使用される基地局
WO2014098536A1 (fr) * 2012-12-21 2014-06-26 Samsung Electronics Co., Ltd. Procédé et appareil de transmission/réception d'un signal dans un système de communication

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05110489A (ja) * 1991-10-16 1993-04-30 Canon Inc 無線通信装置
JPH10190609A (ja) * 1996-12-24 1998-07-21 Sharp Corp 直交周波数多重変調信号復調方法

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05110489A (ja) * 1991-10-16 1993-04-30 Canon Inc 無線通信装置
JPH10190609A (ja) * 1996-12-24 1998-07-21 Sharp Corp 直交周波数多重変調信号復調方法

Also Published As

Publication number Publication date
JP3507683B2 (ja) 2004-03-15
CA2285198C (fr) 2006-03-21
JPH11205260A (ja) 1999-07-30
CA2285198A1 (fr) 1999-07-15

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