WO2004086644A1 - Procede et dispositif de generation de code par etalement, et procede de communication - Google Patents

Procede et dispositif de generation de code par etalement, et procede de communication Download PDF

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Publication number
WO2004086644A1
WO2004086644A1 PCT/JP2004/003924 JP2004003924W WO2004086644A1 WO 2004086644 A1 WO2004086644 A1 WO 2004086644A1 JP 2004003924 W JP2004003924 W JP 2004003924W WO 2004086644 A1 WO2004086644 A1 WO 2004086644A1
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Prior art keywords
sequence
bits
code generation
shift
spreading code
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PCT/JP2004/003924
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English (en)
Japanese (ja)
Inventor
Hiroyasu Sano
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Mitsubishi Denki Kabushiki Kaisha
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Publication of WO2004086644A1 publication Critical patent/WO2004086644A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J13/00—Code division multiplex systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J13/00—Code division multiplex systems
    • H04J13/0074—Code shifting or hopping
    • 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 spreading code generation method for generating a user-specific spreading code used in a wireless communication system employing Code Division Multiple Access (CDMA), and particularly to a spreading method capable of reducing inter-code interference.
  • CDMA Code Division Multiple Access
  • the present invention relates to a spread code generation method for generating a code. Background art.
  • the transmitting-side communication device spreads the transmission data sequence into a wideband signal using a spreading code assigned to the user and transmits the signal. Then, the communication device on the receiving side reproduces the transmission data sequence by performing correlation detection using the same spreading code as the code used for spreading on the transmitting side. In this case, since the received signals of other users have different spreading codes, the signal power is reduced on average. In this way, in the case of the CDMA, all users share the same frequency band and time. Communication is performed, and each user is identified by a uniquely assigned spreading code. '
  • the condition of the spreading code is that the autocorrelation peak at the synchronization timing is sharp, the autocorrelation has a small absolute value at other time shifts, and the crosscorrelation between different codes has a small absolute correlation at all timings. It is required to be a value.
  • a spreading code having excellent correlation such as an M sequence, which is one of the PN sequences, is used (see Non-Patent Document 1).
  • Non-patent document 1 1.
  • the present invention has been made in view of the above, and provides a spread code generation method for generating a spread code capable of suppressing intersymbol interference, and a communication method using the spread code. It is aimed at. Disclosure of the invention
  • the spread code generation method includes a spread code generation method for generating a user-specific spread code used in a wireless communication system employing a code division multiple access system, comprising: A fixed basic sequence with excellent characteristics is cyclically shifted over a single or multiple bits, and a copy of the last bit or multiple bits from the last in the shifted sequence is converted to the sequence of the shifted sequence. A code generation step to be added to the beginning, wherein the shifted sequence is used as a next basic sequence, and the code generation step is repeatedly executed a predetermined number of times to generate a user-specific spreading code. And
  • a copy of the last (single or multiple) bits of each sequence is added to the beginning of the basic sequence and the sequence after the cyclic shift, thereby providing a delayed wave (multipath). Good correlation characteristics are obtained even when is present. Also, by generating a spread code by cyclically shifting the basic sequence, deterioration due to intersymbol interference is suppressed.
  • FIG. 1 is a diagram showing a configuration of a spreading code generation device used in a wireless communication system according to the present invention
  • FIG. 2 is a diagram showing an example of a configuration of a basic sequence generation unit
  • FIG. FIG. 4 is a diagram illustrating a spreading code generation method according to Embodiment 1
  • FIG. 4 is a diagram illustrating a correlation characteristic when a base station transmits data to a user to which a first spreading code is assigned.
  • FIG. 5 is a diagram showing correlation characteristics when the base station transmits data to three users to which the first to third spreading codes are individually assigned
  • FIG. 6 shows a delay wave
  • FIG. 7 is a diagram illustrating a case where (multipath) exists, FIG.
  • FIG. 7 is a diagram illustrating a spread code generation method according to the second embodiment
  • FIG. 8 is a diagram illustrating a spread code generation method according to the third embodiment.
  • FIG. 9 shows the configuration of a wireless communication system according to a fourth embodiment of the present invention.
  • FIG. 10 is a diagram showing a slot format according to the fourth embodiment
  • FIG. 11 is a diagram showing a correlation sequence obtained by the mobile station of Ch # l after despreading.
  • FIG. 12 is a diagram illustrating a configuration of a wireless communication system according to a fifth embodiment of the present invention.
  • FIG. 13 is a diagram illustrating a slot format of the fifth embodiment.
  • FIG. 14 is a diagram showing a state of power versus time when a received signal is spread with a first spreading code.
  • FIG. 15 is a diagram showing a configuration of a sixth embodiment of the wireless communication system according to the present invention.
  • FIG. 16 is a diagram showing a plurality of carriers for transmitting signals. BEST MODE FOR
  • FIG. 1 is a diagram showing a configuration of a spread code generation device used in a wireless communication system (CDMA) according to the present invention.
  • Basic sequence generator that generates the basic M sequence 1, a sequence phase shift unit 2 that shifts the M sequence phase by a predetermined bit, a partial sequence addition unit 3 that adds a predetermined partial sequence to the beginning or end of the cyclically shifted sequence, and controls the bit shift amount. It comprises a shift control section 4 and an additional control section 5 for determining the size of the above-mentioned subsequence.
  • the condition of the spreading code used in the CDMA is that the autocorrelation peak at the synchronization timing is sharp, the autocorrelation has a small absolute value at other time shifts, and the cross-correlation between different codes is the same as before. It is required that the absolute value be small at the timing of.
  • FIG. 2 is a diagram showing an example of the configuration of the basic sequence generation unit 1.
  • an M sequence having excellent autocorrelation characteristics is adopted as a basic sequence of a spreading code.
  • the spreading code is not limited to this, and for example, an orthogonal Go 1d code based on a Go 1d sequence may be used.
  • FIG. 3 is a diagram showing a spread code generating method according to the first embodiment.
  • the M sequence generated by the basic sequence generation unit 1 in FIG. 2 is “00001 0 0 1 1 0 1 0 1 1 1”.
  • the shift amount control by the shift control unit 4 will be described in units of 1 bit, and the size of the additional part determined by the addition control unit 5 will be described as 1 bit.
  • the subsequence adding section 3 copies the last one bit of the basic sequence under the control of the addition control section 5 using the M sequence shown in FIG.
  • the first spreading code (16 bits) is generated by adding it to the beginning of the sequence (see Fig. 3).
  • the shift process by the sequence phase shift unit 2 is not performed.
  • the sequence phase shift unit 2 performs a cyclic shift of .1 bits on the basic sequence under the control of the shift control unit 4. Then, under the control of the addition control unit 5, the subsequence sequence addition unit 3 copies the last one bit of the sequence after the cyclic shift, adds it to the beginning of this sequence, and adds it to the second spreading code ( 16 bits) (See Fig. 3).
  • sequence phase shift section 2 performs a one-bit cyclic shift on the basic sequence under the control of shift control section 4 in the same procedure as described above. Then, under the control of the subsequence addition section 31 addition control section 5, the last one bit of the cyclically shifted sequence is copied, and it is added to the beginning of this sequence, and the third spreading code (16 bits) is added. Generate (see Fig. 3).
  • FIG. 4 is a diagram illustrating correlation characteristics when, for example, a base station transmits data to a user to which a first spreading code is assigned.
  • FIG. 5 is a diagram showing a correlation characteristic when data is transmitted to three users to which base stations ⁇ first to third spreading codes are individually assigned. ) transmission data S 1 to each user; represents a correlation characteristic when the S 2, 3 3 "0" "0""0", (b) the transmission data S 1 to each user; S 2, 3 3 represents the correlation characteristic when "0""1""0".
  • the Hirokag code generation apparatus adds a copy of the end (plural) bits of each sequence to the beginning of the basic sequence and the sequence after cyclic shift in the spread code generation process. I decided that. As a result, good correlation characteristics can be obtained even when a delayed wave (multipath) exists (see FIG. 6). Also, a spreading code is generated by cyclically shifting the basic sequence. As a result, deterioration due to intersymbol interference can be suppressed.
  • the shift amount is controlled by the shift control unit 4 in units of 1 bit, but the present invention is not limited to this, and the shift amount may be shifted in units of 2 bits or more.
  • the size of the additional portion determined by the additional control unit 5 is 1 bit, but is not limited thereto, and may be 2 bits or more as long as it is shorter than the sequence length of the basic sequence and the sequence after cyclic shift.
  • the configuration of the spread code generation device is the same as that of the first embodiment described above, and thus the same reference numerals are given and the description thereof will be omitted.
  • the basic sequence generator 1 As in the first embodiment, the M-sequence generation circuit in FIG. 2 is used. In the present embodiment, only operations different from those of the first embodiment described above will be described.
  • FIG. 7 is a diagram illustrating a spread code generation method according to the second embodiment.
  • the spreading code generation apparatus copies the first bit of the basic sequence under the control of the subsequence addition unit 3 and the addition control unit 5 using the M sequence shown in FIG.
  • the first spreading code (16 bits) is added to the tail (see Fig. 7).
  • the shift process by the sequence phase shift unit 2 is not performed.
  • sequence phase shift unit 2 performs a one-bit cyclic shift on the basic sequence under the control of the shift control unit 4. Then, under the control of the subsequence sequence addition unit 3 and the control unit 5, the first bit of the sequence after the cyclic shift is copied and added to the end of this sequence, and the second spreading code (16 Bit) (see Figure 7). Finally, in the spreading code generation apparatus, sequence phase shift section 2 performs a one-bit cyclic shift on the basic sequence under the control of shift control section 4 in the same procedure as described above.
  • the subsequence addition unit 3 copies the first bit of the sequence after the cyclic shift, attaches it to the end of this sequence, and adds a third spreading code (16 bits) (see Fig. 7).
  • the spreading code generation apparatus adds a copy of the head (multiple) bits of each sequence to the end of the basic sequence and the sequence after the cyclic shift in the spreading code generation process. I decided. As a result, good correlation characteristics can be obtained even when a delayed wave (multipath) is present. In addition, a spreading code is generated by cyclically shifting the basic sequence. Thus, deterioration due to intersymbol interference can be suppressed.
  • FIG. 8 is a diagram illustrating a spread code generation method according to the third embodiment.
  • the subsequence sequence adding section 3 copies the first bit of the basic sequence under the control of the addition control section 5 using the M sequence shown in FIG. Add to the end. Furthermore, the last one bit of the basic sequence is copied and added to the beginning of the basic sequence to generate the first spreading code (17 bits) '(see Fig. 8).
  • the shift processing by the sequence phase shift section 2 is not performed.
  • the sequence phase shift unit 2 performs a one-bit cyclic shift on the basic sequence under the control of the shift control unit 4. Then, under the control of the partial sequence addition section 31 ′ addition control section 5, the first bit of the sequence after the cyclic shift is copied, and it is added to the end of this sequence. Furthermore, the last one bit of the sequence after the cyclic shift is copied and added to the beginning of this sequence to generate a second spreading code (17 bits) (see Fig. 8).
  • sequence phase shift section 2 performs a one-bit cyclic shift on the basic sequence under the control of shift control section 4 in the same procedure as described above. Then, under the control of the addition control unit 5, the subsequence addition unit 3 copies the first bit of the sequence after the cyclic shift and adds it to the end of this sequence. Furthermore, copy the last 1 bit of the sequence after cyclic shift and add it to the beginning of this sequence. Then, a third spreading code (17 bits) is generated (see FIG. 8).
  • the spreading code generation apparatus sets the start and end of the base sequence and the sequence after the cyclic shift to copy and start the last bit of each sequence, respectively. We decided to add a copy of the bit. As a result, good correlation characteristics can be obtained even when a delayed wave (multipath) exists.
  • spreading codes are generated by cyclically shifting the basic sequence. As a result, deterioration due to intersymbol interference can be suppressed.
  • the size of the additional portion determined by the additional control unit 5 is made equal (.1 bit) before and after, but is not limited to this, and may be larger than the sequence length of each sequence. If it is short, it can be 2 bits or more. :
  • FIG. 9 is a diagram showing the configuration of a wireless communication system according to a fourth embodiment of the present invention. Specifically, (a) shows the configuration of a communication device (base station) on the transmission side, and (b) Represents the configuration of the communication device (mobile station) on the receiving side.
  • the base station according to the present embodiment uses the first to N-th spreading codes generated by the methods of Embodiments 1 to 3 to transmit data S x (t), S 2 (t),. .., 11 1-N, and a multiplexing unit 12 for multiplexing the spread signals.
  • the spread code generation apparatuses according to Embodiments 1 to 3 described above may be located inside the base station or outside the base station.
  • the mobile station of the present embodiment includes a despreading unit 21 for despreading with the user-specific spreading code, a correlation sequence calculating unit 22 for correlating with a given reference signal, and a known sequence.
  • An in-phase addition unit 23 for in-phase addition a square value calculation unit 24 for calculating a power value from the in-phase addition result, and a channel estimation unit 25 for calculating a channel estimation value using the in-phase addition result.
  • a delay unit 26 for adding a predetermined delay to the spread signal, a sampling unit 27 for sampling the despread signal after the delay, and a phase compensation unit 2 for compensating the phase of the sampling signal based on the channel estimation value 8 and a data determination unit 29 for determining a signal after phase compensation.
  • the communication method according to the present embodiment will be described.
  • the number of mobile stations At the base station, the number of mobile stations
  • Each of the spreading units (111-11-111N) according to the first to Nth spreading codes generated by the method according to the first to third embodiments uses known sequences # 1 to #N, Transmission data S 1
  • the multiplexing unit 12 multiplexes the spread signal and transmits the multiplexed signal over the wireless transmission.
  • each despreading unit 21 despreads the known sequence portion of the received signal in symbol units using the first to Nth spreading codes unique to the user, and obtains a desired correlation sequence. Is extracted.
  • FIG. 10 is a diagram showing a slot format according to the fourth embodiment.
  • the first to Nth spreading codes are assigned to each user (mobile station) (channels Ch i to N), and known sequences # 1 to #N are assigned to some of the slots. Has been introduced.
  • this known sequence bits having an arbitrary code are arranged in the channel direction at the same symbol time.
  • the amount of phase shift of the spreading code increases as the channel number (1 to N) increases.
  • a unique correlation sequence corresponding to the shift amount of the spreading code is obtained. That is, when the code multiplexing number is N, an N-bit correlation sequence is output.
  • FIG. 7 is a diagram showing a correlation sequence obtained after despreading by the mobile station of Ch # 1 in the case of.
  • the mobile station of Ch # 1 obtains a correlation sequence of "010001 1"
  • the mobile station of Ch # 2 obtains a correlation sequence of "10001 10”.
  • other mobile stations can obtain a correlation sequence that is cyclically shifted by 1 bit with the increase in channel number.
  • the case where the phase shift amount between adjacent channels is in units of 1 bit is not limited to this, and the shift may be performed in units of 2 bits or more. Also, the shift may be performed at unequal bit intervals.
  • the correlation sequence calculation unit 22 calculates a correlation between the despread signal and a predetermined reference signal of the same symbol for each received symbol, and Establish a period.
  • the in-phase addition unit 23 increases the correlation power by performing in-phase addition on the correlation sequences output from the correlation sequence calculation unit 22 over the number of symbols.
  • channel estimation section 25 performs channel estimation using the in-phase addition result.
  • in-phase addition is performed for the number of symbols in the known sequence. By doing so, slot position detection processing and synchronization establishment processing are performed.
  • the square value calculating section 24 calculates a power value (correlation value) from the in-phase addition result, and outputs the value to the sampling section 27.
  • the delay unit 26 adds a time corresponding to the processing time of the correlation sequence calculation unit 22, the in-phase addition unit 23, and the square value calculation unit 24 to the despread signal of the despreading unit 21, Make adjustments.
  • the sampling section 27 samples the despread signal after the delay adjustment based on the correlation value of the output of the square value calculation section 24.
  • the phase compensator 28 compensates the phase of the sampled despread signal based on the channel estimation value output from the channel estimation unit 25.
  • the data determination section 29 determines the signal after the phase compensation and outputs a data series of “0” or “1”. -.
  • the mobile station despreads the known sequence portion of the received signal using the user-specific spreading code generated and assigned by the method of Embodiments 1 to 3,
  • the synchronization establishment process and the channel estimation process were performed using the results.
  • slot positions can be detected with high accuracy, and channel estimation with high accuracy can be realized.
  • phase shift amount of the spreading code increases as the channel number (1 to N) increases
  • present invention is not limited to this, and the channel number (1 to N) increases.
  • the phase shift amount of the spreading code may be reduced.
  • FIG. 12 is a diagram showing a configuration of a wireless communication system according to a fifth embodiment of the present invention. Specifically, (a) shows the configuration of a communication device (base station) on the transmitting side, and (b) Represents the configuration of the communication device (mobile station) on the receiving side.
  • the base station according to the present embodiment includes a multiplier 13 for multiplying the spread signal of Ch # 1 by a predetermined gain (G). It is configured to include a despreading unit 31 that despreads the received signal of Ch # 1 with a common spreading code.
  • Ch # 1 is a dedicated channel of a known sequence, and all users share the first spreading code.
  • G predetermined gain
  • each spreading section (1 1-2-11-N) according to the number of mobile stations to be accommodated is transmitted using the second to Nth spreading codes generated by the method of Embodiments 1 to 3.
  • S 2 (t) to S N (t) are spread for each symbol.
  • the multiplexing unit 12 multiplexes all the spread signals and transmits the multiplexed signals on the radio transmission path. .
  • each despreading section 31 despreads the received signal in symbol units using a first spreading code provided to each user, and extracts a desired correlation sequence. . '
  • FIG. 13 is a diagram showing a slot format according to the fifth embodiment.
  • a known sequence (power amplification) spread with a first spreading code is assigned to channel Ch # l, and a second channel for each user (mobile station) is assigned to channel # 2 to #N.
  • Transmission data S 2 (t) to S N (t) spread with the Nth spreading code are assigned.
  • FIG. 14 is a diagram showing a state of power versus time when a received signal is spread with a first spreading code.
  • the signal after despreading has higher power than the signal of each user. Therefore, the power of the signal after the in-phase addition becomes larger than the signal of each user, and the correlation power value obtained by the square value calculation becomes the largest, so that the slot position detection processing and the synchronization establishment processing are performed with high accuracy. It can be performed.
  • the delay unit 26 adds a time corresponding to the processing time of the in-phase adder 23 and the square value calculator 24 to the received signal to adjust the delay.
  • the despreading unit 21 despreads the delay-adjusted received signal using a user-specific spreading code to extract a desired signal.
  • the sampling section 27 samples the despread signal based on the relative value of the output of the square value calculation section 24.
  • one of the spreading codes generated by the methods of Embodiments 1 to 3 is used as a spreading code common to each user, and the base station uses a spreading code common to each user.
  • the known sequence after spreading the known sequence using a code and amplifying the signal power is multiplexed with the spread signal of each user and transmitted, and the mobile station uses a common spreading code for each user.
  • the received signal is despread, and the synchronization establishment process and channel estimation process are performed using the result. Thereby, the same effect as in Embodiment 13 can be obtained, the slot position can be detected with high accuracy, and highly accurate channel estimation can be realized.
  • FIG. 15 is a diagram showing a configuration of a wireless communication system according to a sixth embodiment of the present invention.
  • FIG. 16 is a diagram showing a plurality of carriers for transmitting signals.
  • the configuration of the communication device on the transmission side of Embodiment 4 or 5 (the transmission data S u (t) to S 1N (t) shown in FIG. A configuration including a spreading unit 11 1 to ⁇ that spreads with a spreading code, and a spreading unit 1 L that spreads transmission data S M1 (1 :) to S MN (t) with first to N M th spreading codes.
  • the frequency selection unit The signal of the desired carrier selected by 41 is demodulated using the communication device on the receiving side according to the fourth or fifth embodiment.
  • the communication capacity is increased without increasing inter-code interference.
  • information for selecting a carrier is notified using a specific channel of a specific carrier in order to determine which carrier carries a signal to the own mobile station.
  • the spreading code generation method, the spreading code generation device, and the communication method according to the present invention are useful for a wireless communication system employing CDMA, and are particularly useful for generating a user-specific spreading code. Suitable for technology.

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  • Computer Networks & Wireless Communication (AREA)
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Abstract

L'invention porte sur un procédé de génération de code par étalement qui génère un code par étalement unique à un utilisateur et qui est utilisé dans un système de communication radio employant l'AMRC (l'accès multiple par répartition de code). Une section de déphasage de séquence (2) déphase cycliquement, par commande d'une section de commande de déphasage (4), une séquence de base prédéfinie ayant une excellente caractéristique d'autocorrélation sur un seul bit ou plusieurs bits. De plus, une section d'addition de séquence partielle (3) ajoute, par commande d'une section de commande d'addition (5), une copie d'au moins un bit ou de plusieurs bits depuis la fin de la séquence après le déphasage par rapport à la tête de la séquence après le déphasage. Ensuite, la séquence après déphasage est utilisée comme séquence de base et le processus de la section de déphasage de séquence (2) et de la section d'addition de séquence partielle (3) est effectué de façon itérative, plusieurs fois, générant ainsi un code par étalement unique à l'utilisateur.
PCT/JP2004/003924 2003-03-27 2004-03-23 Procede et dispositif de generation de code par etalement, et procede de communication WO2004086644A1 (fr)

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JP2003088928A JP2004297593A (ja) 2003-03-27 2003-03-27 拡散符号生成方法、拡散符号生成装置および通信方法
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US9484982B2 (en) 2007-06-15 2016-11-01 Optis Wireless Technology, Llc Base station apparatus and radio communication method
CN103546228B (zh) * 2007-06-15 2017-08-08 光学无线技术有限责任公司 无线通信装置、响应信号扩频方法以及集成电路
US10200083B2 (en) 2007-06-15 2019-02-05 Optis Wireless Technology, Llc Base station apparatus and radio communication method
US10958303B2 (en) 2007-06-15 2021-03-23 Optis Wireless Technology, Llc Spreading a response signal using a first set of orthogonal sequences and a reference signal using a second set of shorter orthogonal sequences
RU2763957C2 (ru) * 2007-06-15 2022-01-11 Оптис Вайрлесс Текнолоджи, ЛЛК Устройство беспроводной связи и способ расширения сигнала ответа

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