WO2015162771A1 - Système de communication sans fil - Google Patents

Système de communication sans fil Download PDF

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Publication number
WO2015162771A1
WO2015162771A1 PCT/JP2014/061647 JP2014061647W WO2015162771A1 WO 2015162771 A1 WO2015162771 A1 WO 2015162771A1 JP 2014061647 W JP2014061647 W JP 2014061647W WO 2015162771 A1 WO2015162771 A1 WO 2015162771A1
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WO
WIPO (PCT)
Prior art keywords
code
wireless communication
communication system
data
encoding
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PCT/JP2014/061647
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English (en)
Japanese (ja)
Inventor
正裕 青野
武井　健
大倉　敬規
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株式会社日立製作所
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Priority to PCT/JP2014/061647 priority Critical patent/WO2015162771A1/fr
Publication of WO2015162771A1 publication Critical patent/WO2015162771A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/10—Polarisation diversity; Directional diversity
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J13/00—Code division multiplex systems
    • H04J13/10—Code generation

Definitions

  • the present invention relates to a wireless communication system.
  • Patent Document 1 describes a configuration characterized in that spectrum transmission is performed by spread spectrum using a spreading code in which the side lobe of the autocorrelation function is 0 and the cross-correlation function is 0 at a predetermined phase” It is described.
  • Patent Document 1 describes a multiplex communication system using spreading codes. In this method, it is necessary to synchronize between a code used for encoding and a code used for decoding at the time of decoding. However, there is a problem that the longer the code length, the larger the scale of the synchronization circuit and the time required for synchronization.
  • the present invention provides a wireless communication system that can perform decoding without having to synchronize codes.
  • the present invention is a wireless communication system that performs communication using a plurality of pairs of codes used for encoding and codes used for decoding, and communication data is transmitted using any code.
  • the code to be decoded and the code to be decoded are multiplied by a certain phase and added over a fixed period, and become a non-zero value, and different pairs of codes are multiplied with a random phase and added over a fixed period. Then, it becomes about 0.
  • the present invention provides a wireless communication system capable of decoding without having to synchronize between a code used for encoding transmission data and a code used for decoding received data.
  • the circuit that decodes the data encoded with the code (1 + i 1-i -1-i -1 + i) was encoded with the code (1 + i -1 + i -1-i 1-i) It is an example when data is input
  • a wireless communication system in which a plurality of wireless terminals communicate with one wireless base station is shown.
  • Fig. 1 shows an example of the configuration of this wireless communication system.
  • 100.a, 100.b, and 100.c are representative of wireless terminals. These wireless terminals perform wireless communication with the base station 200 using radio waves of the same frequency.
  • Different data A, B, and C are transmitted from the wireless terminals 100.a, 100.b, and 100.c, and the base station 200 receives the combined signal as a received wave.
  • spectrum spreading is performed using a different spreading code for each transmission wave.
  • the base station 200 can identify a signal from each wireless terminal 100.a, 100.b, ⁇ ⁇ 100.c by decoding using a code corresponding to each spreading code.
  • Code set [(1 1 1 1), (1 i -1 -i), (1 -i -1 i)] as a code for encoding, and a combination of translation, rotation, and scaling on the complex plane A modified code set is used.
  • a spreading code used for encoding is called an encoding code
  • a code used for decoding corresponding to the encoding code is called a decoding code.
  • Fig. 2 shows a configuration example of a transmitter in this wireless system.
  • the transmission data generated by the transmission data generation unit 101 is multiplied by the multiplier 102 and the encoding code generated by the code generation unit 104 in two systems of I phase and Q phase. Since the same transmission data is multiplied by a code in two systems of the I phase and the Q phase, it is possible to multiply a code composed of complex numbers.
  • a code set of code length 4 [(1 + i 1 + i 1 + i 1 + i 1 + i), (1 + i 1-i -1-i -1 + i), ( 1 + i -1 + i -1-i 1-i)].
  • This is the original code set [(1 1 1 1), (1 i -1 -i), (1 -i -1 i)] rotated 45 ° on the complex plane and expanded to ⁇ 2 times. is there.
  • the code set [(1 + i 1 + i 1 + i 1 + i 1 + i), (1 + i -1 + i -1-i 1-i), (1 + i 1-i -1-i -1 + i)].
  • the real part of the code is repeated in the order of (1I1 -1 -1) in the I phase. Multiply.
  • the coefficient of the imaginary part of the code is repeatedly multiplied in the order of (1 -1 -1 1). At this time, the code repetition period is shorter than the transmission data period.
  • the encoded transmission data is converted into an analog signal in each of the I-phase and Q-phase by a digital-analog converter (hereinafter referred to as DAC) 103.
  • the carrier wave generated by the oscillator 106 is modulated by being multiplied by the analog-converted signal.
  • the phase of the Q-phase carrier is delayed by a quarter period with respect to the I-phase carrier by the delay unit 105.
  • the adder 107 adds the I-phase and Q-phase signals.
  • the added signal is band-limited by a band-pass filter 109, amplified by a power amplifier (hereinafter referred to as PA) 110, and transmitted from the transmission antenna 108.
  • PA power amplifier
  • Fig. 3 shows a configuration example of a receiver in this wireless system.
  • the receiver 200 requires the receiving circuit shown in FIG. 3, one for each code of the code set.
  • a signal transmitted from the transmitter 100 is received by the receiving antenna 201 and amplified by a low noise amplifier (hereinafter referred to as LNA) 202.
  • LNA low noise amplifier
  • the amplified received wave is band-limited by a bandpass filter 109.
  • the received wave is multiplied by the carrier 102 regenerated by the carrier regenerator 207 and multiplied by the multiplier 102 in two systems of I phase and Q phase, and demodulated by passing through the low-pass filter 205.
  • the carrier wave multiplied by the Q phase is delayed by a quarter period with respect to the carrier wave multiplied by the I phase by the delay unit 105.
  • the demodulated signal is digitally converted by an analog-to-digital converter (hereinafter referred to as ADC) 203 for each of the I phase and Q phase.
  • ADC analog-to-digital converter
  • the digitally converted signal is complex multiplied by the decoding code generated by the code generation unit 104 by the complex multiplication circuit 300.
  • the complex-multiplied signal is accumulated by the period adder 204 for the same time as the period of the code, and is processed by the reception data processing unit 206 to become reception data.
  • the decryption method In decoding, it is necessary to distinguish between data encoded with a target encoding code and data encoded with other encoding codes. In the following description of the decoding method, the data to be encoded is always 1 for simplicity.
  • the code period is t.
  • the complex decoding circuit 300 performs complex multiplication on the corresponding decoding code, and the period addition circuit 204 performs integration for the same period as the code period.
  • FIG. 4 shows a configuration example of the complex multiplication circuit 300.
  • the real part of the decoding code generated by the code real part generation unit 301 is multiplied by the multiplier 102 in the I phase, and the code imaginary part generation unit 302 in the Q phase.
  • the multiplier 102 sequentially multiplies the coefficients of the imaginary part of the generated decoding code.
  • the multiplication results are added separately by the adder 107 for the real part and the imaginary part, and the real part is output as the I phase and the imaginary part is output as the Q phase.
  • the complex decoding circuit 300 multiplies the same code (1 + i 1 + i 1 + i 1 + i) as the corresponding decoding code.
  • FIG. 5 is a diagram showing a case where data encoded with an encoding code (1 + i 1 + i 1 + i 1 + i) targeted by the complex multiplication circuit is received. Since it is assumed that the data to be encoded is always 1 at this time, the encoded data 501 is a repetition of (1 + i 1 + i 1 + i 1 + i). On the other hand, when the decoding code 502 is multiplied, the complex multiplication result 503 is repeated as (2i 2i 2i 2i). When this is integrated over time in the cycle t of the code in the cycle adder 204, the result is 8i ⁇ t. It is obvious that the addition result is constant regardless of the phase of the encoding code and the decoding code.
  • FIG. 6 is a diagram showing a case where data encoded with different encoding codes (1 + i, 1-i, -1-i, -1 + i) of the same code set is received.
  • the encoded data 601 is a repetition of (1 + i 1-i -1-i -1 + i).
  • the decoding code 602 is multiplied here, the complex multiplication result 603 is repeated (2i, 2, -2i, -2).
  • this is integrated in the period addition circuit 204 for the time of the period t of the code, it becomes zero. Also in this case, it is obvious that the addition result is constant regardless of the phase of the encoding code and the decoding code.
  • the addition result is 0.
  • FIG. 7 is a diagram showing a case where data encoded with an encoding code (1 + i 1-i -1-i -1 + i) as an object is received by this complex multiplication circuit. It is assumed that the decoding code 702 is multiplied by the time ⁇ t (0 ⁇ ⁇ t ⁇ t / 4) and multiplied by the encoded data 701. Then, the complex multiplication result 703 becomes (2 2i 2 2i 2 2i 2 2i). At this time, the time when 2 is output is ⁇ t, and the time when 2i is output is 4 / t ⁇ t. From this result, it can be seen that the complex multiplication result 703 takes a non-zero value regardless of ⁇ t.
  • FIG. 8 is a diagram showing a case where data encoded with different encoding codes (1 + i -1 + i -1-i 1-i) of the same code set is received.
  • the decoding data 802 is multiplied by the time ⁇ t (0 ⁇ ⁇ t ⁇ t / 4) and multiplied by the encoded data 801.
  • the complex multiplication result 803 is the repetition of (2 2i -2 -2i 2 2i -2 -2i).
  • the time when 2 and -2 are output is ⁇ t
  • the time when 2i and -2i are output is 4 / t- ⁇ t
  • the period addition result is 0 regardless of ⁇ t.
  • data encoded with the code of the code set (1 + i 1 + i 1 + i 1 + i) is received, it becomes 0 regardless of ⁇ t.
  • the period adder 204 can continuously accumulate, but in reality, it is discretely added at a certain period. However, if the number of times of sampling in each element of the code is the same as the timing, the same result can be obtained even in a discrete case.
  • the transmission data generating unit 101 adds identification data (1 ⁇ ⁇ ⁇ ⁇ -1 1 -1 1) for identifying the binary data to the head of the data string. This identification data is determined in advance and shared by the transceiver. The data to which the identification data is added is multiplied by an encoding code.
  • This encoded data is transmitted from the transmitter and received by the receiver.
  • the receiver multiplies the decoding code (1 + i -1 + i -1-i 1-i), and the period adder 204 adds one period of the code for decoding.
  • the decoded data is 4 + 4i while the transmission data is 1, and -4 while the transmission data is -1. -4i.
  • the added identification data is (4 + 4i -4-4i 4 + 4i -4-4i 4 + 4i 4 + 4i), and this is detected by the received data processing unit 206.
  • communication is performed using a plurality of pairs of encoding codes and decoding codes.
  • the encoding code and decoding code to be used are codes that have strong autocorrelation and zero cross-correlation.
  • the paired encoding code and decoding code are multiplied by an arbitrary phase and cyclic addition is performed, a non-zero value is obtained, and different pairs of encoding code and decoding code are multiplied by any phase and cyclic addition is performed. Then it becomes zero.
  • the synchronization circuit is not necessary, and the apparatus can be reduced in size.
  • Example 1 since the code length of the code used was 4, the number of wireless terminals that can communicate simultaneously was 3 or less. In the present embodiment, an example is applicable even when the number of wireless terminals is four or more. When the number of wireless terminals is 4 or more, the code is expanded and the number of codes in the code set is increased. The extension of the code can be realized by repeating the code, expanding the similarity, and a combination thereof.
  • a code set of code length 8 is created based on a code set of code length 4 [(1 1 1 1), (1 i -1 -i), (1 -i -1 i)], the code set [( 1 1 1 1 1 1 1), (1 1 ii -1 -1 -i -i), (1 1 -i -i -1 ii), (1 i -1 -i 1 i -1- i), (1 -i -1 i 1 -i i)].
  • the decoding code corresponding to this coding code is [(1 1 1 1 1 1 1 1), (1 1 -i -i -1 -1 ii), (1 1 ii -1 -1 -i -i ), (1 -i -1 i 1 -i -1 i), (1 i -1 -i 1 i -1 -i)].
  • FIG. 9 shows a configuration example of this embodiment.
  • Three transmitters 100 according to the first embodiment are mounted in the transmitter 901, and the communication capacity is increased by transmitting different data simultaneously from the respective antennas 903.a, 903.b, and 903.c.
  • the code set [(1 + i 1 + i 1 + i 1 + i), (1 + i 1-i -1-i -1 + i), (1 + i -1 + i -1-i 1-i)].
  • Each of the receiving antennas 904.a, 904.b, and 904.c has three transmitting antennas 903.a and 903.b.
  • the transmission wave from 903.c is synthesized and received. At this time, the phases of the encoding codes of the three transmission waves synthesized are not aligned.
  • a decoding code set [(1 + i 1 + i 1 + i 1 + i 1 + i), (1 + i -1 + i -1-i 1-i), ( 1 + i 1-i -1-i -1 + i)]
  • the data other than the data encoded with the target encoding code is 0 regardless of the code phase. Therefore, only data encoded by the target encoding code can be selectively extracted.
  • the communication capacity can be increased.
  • the communication capacity can be increased in addition to the effects of the first embodiment. Further, by expanding the code as in the second embodiment, the number of antennas that can be simultaneously transmitted and received can be increased, so that the communication capacity can be further increased.
  • Fig. 10 shows a configuration example of the transmitter of this system.
  • the encoding code can be switched by a code switch 1001. Further, the polarization angle of the transmission wave can be changed by adjusting the power input to the vertically polarized antenna 1003 and the horizontally polarized antenna 1004 by the antenna switch 1002.
  • Fig. 11 shows a configuration example of the receiver of this wireless system.
  • One set of each of the code generation unit 104, the complex multiplication circuit 300, and the period adder 204 is required for the number of polarization angles to be used.
  • the transmitted wave may pass through different propagation paths for each polarization angle.
  • the transmission waves having a plurality of polarization angles transmitted from the transmitter 1000 reach the receiver 1100 in a combined state.
  • the code pairs of the present invention [(1 + i 1 + i 1 + i 1 + i), (1 + i 1-i -1-i -1 + i), (1 + i -1 + i -1-i 1-i)] is used to encode the data.
  • a code (1 + i 1 + i 1 + i 1 + i 1 + i) is transmitted for a transmission wave transmitted at a polarization angle of 0 °
  • a code (1 + i 1) is transmitted for a transmission wave transmitted at a polarization angle of 45 °.
  • -i -1-i -1 + i) is transmitted for a transmission wave transmitted at a polarization angle of 45 °.
  • -i -1-i -1 + i) is transmitted for a transmission wave transmitted at a polarization angle of 45 °.
  • -i -1-i -1 + i a transmission wave transmitted at a polarization angle of 90 ° is encoded using a code (1 + i -1 + i -1-i 1-i).
  • the code switch 1001 that switches the encoding code and the antenna switch 1002 that changes the polarization angle are time-synchronized, and the encoding code and the polarization angle can be switched simultaneously.
  • the decoding code sets [(1 + i 1 + i 1 + i 1 + i 1 + i), (1 + i -1 + i -1-i 1-i), (1 + i 1-i- 1-i -1 + i)] is used in the same manner as in the first embodiment, so that data for each polarization angle can be selectively received from the synthesized received wave. Further, by extending the code as in the second embodiment, it is possible to increase the polarization angle to be used.
  • FIG. 11 shows a configuration example of a transmitter
  • FIG. 12 shows a configuration example of a receiver.
  • the transmission data generation unit 101 adds a header (1 -1 1 -1 1 1) to the transmission data.
  • the multiplier 102 multiplies the real part of the code in the I phase and the imaginary part of the code in the Q phase. Each of these is multiplied by the carrier wave generated by the carrier wave generating unit 401 in the FPGA. At this time, the phase of the carrier wave multiplied by the Q phase is shifted by a quarter period by the delay unit 105.
  • the encoded data is added by the adder 107 and converted into an analog signal by the DAC 103 outside the FPGA 1301.
  • the analog-converted data is amplified by the PA 110, band-limited by the band-pass filter 109, and then transmitted from the transmission antenna 108.
  • the transmitted data is received by the antenna 201 of the receiver and amplified by the LNA 202.
  • the amplified signal passes through the band-pass filter 109, is digitally converted by the ADC 203, and is input to the FPGA 1301.
  • the input signals are I-phase and Q-phase, respectively, and the multiplier 102 multiplies the sine wave 4 generated by the sine wave generation unit 402 and having the same frequency as the carrier wave.
  • the sine wave multiplied by the Q phase is delayed by a quarter period with respect to the I phase by the delay unit 104. At this time, since the phase of the sine wave to be multiplied is not synchronized with the phase of the carrier wave of the received signal, the phase may be shifted.
  • Phase shift is (1) - ⁇ / 4 or more and less than ⁇ / 4 (2) ⁇ / 4 or more and less than 3 ⁇ / 4 (3) 3 ⁇ / 4 or more and less than 5 ⁇ / 4 (4) 5 ⁇ / 4 or more and 7 ⁇ /
  • the case is divided into one of less than 4.
  • Data is received correctly in the case of (1), but is received i times in the case of (2), -1 times in the case of (3), and -i times in the case of (4).
  • the phase is shifted by ⁇ / 4
  • the power of the data is reduced by a maximum of cos ( ⁇ / 4) times.
  • this is not a problem if it is sufficiently amplified by the amplifier.
  • the signal multiplied by the sine wave passes through the low-pass filter 205 and is then multiplied by the decoding code in the complex multiplier 300. Thereafter, one period of code is added by the period adder 204, and the reception data processing unit 206 becomes reception data.
  • the received data is multiplied by a constant due to the deviation of the sine wave.
  • the added identification data is By confirming, it is possible to obtain desired data.
  • the identification data is (i -i i -i i i).
  • Embodiment 2-4 can be implemented with the same configuration.
  • this invention is not limited to an above-described Example, Various modifications are included.
  • the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described.
  • a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment.
  • Each of the above-described configurations, functions, processing units, processing means, and the like may be realized by hardware by designing a part or all of them with, for example, an integrated circuit.
  • Each of the above-described configurations, functions, and the like may be realized by software by interpreting and executing a program that realizes each function by the processor.
  • Information such as programs, tables, and files for realizing each function can be stored in a recording device such as a memory, a hard disk, or an SSD (Solid State Drive), or a recording medium such as an IC card, an SD card, or a DVD.

Abstract

La présente invention concerne un système de communication sans fil qui peut décoder sans qu'il soit nécessaire de synchroniser les codes. Le système de communication sans fil de l'invention réalise une communication à l'aide de multiples paires de codes, composées d'un code utilisé dans l'encodage et d'un code utilisé dans le décodage. Il est caractérisé en ce qu'il est doté d'un émetteur, qui utilise un des codes pour encoder et transmettre des données de communication, ainsi que d'un récepteur, qui décode les données de communication reçues à l'aide du code en paire avec le code utilisé par l'émetteur pour encoder lesdites données de communication, le code pour l'encodage et le code pour le décodage étant une valeur autre que zéro lorsque les codes en paires sont multipliés par une phase quelconque et ajoutés sur une période fixe et étant approximativement de zéro lorsque les codes de différentes paires sont multipliés par une phase quelconque et ajoutés sur une période fixe.
PCT/JP2014/061647 2014-04-25 2014-04-25 Système de communication sans fil WO2015162771A1 (fr)

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Cited By (1)

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WO2017213102A1 (fr) * 2016-06-09 2017-12-14 株式会社日立製作所 Système sans fil, système de commande d'ascenseur l'utilisant, et système de surveillance d'installation de transformateur

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JP2001156720A (ja) * 1999-11-22 2001-06-08 Toshiba Corp 光伝送システムおよび光伝送方法
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JP2003134041A (ja) * 2001-10-30 2003-05-09 Matsushita Electric Ind Co Ltd 無線伝送装置、アンテナ測定装置及び無線伝送方法
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JP2001156720A (ja) * 1999-11-22 2001-06-08 Toshiba Corp 光伝送システムおよび光伝送方法
JP2002290273A (ja) * 2001-03-27 2002-10-04 Hitachi Kokusai Electric Inc スペクトラム拡散通信用スライディングコリレータ
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WO2017213102A1 (fr) * 2016-06-09 2017-12-14 株式会社日立製作所 Système sans fil, système de commande d'ascenseur l'utilisant, et système de surveillance d'installation de transformateur

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