WO2008022511A1 - Procédé de configuration de paramètres à préfixe cyclique pour trame radio et signal radio de transmission - Google Patents

Procédé de configuration de paramètres à préfixe cyclique pour trame radio et signal radio de transmission Download PDF

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Publication number
WO2008022511A1
WO2008022511A1 PCT/CN2007/000992 CN2007000992W WO2008022511A1 WO 2008022511 A1 WO2008022511 A1 WO 2008022511A1 CN 2007000992 W CN2007000992 W CN 2007000992W WO 2008022511 A1 WO2008022511 A1 WO 2008022511A1
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Prior art keywords
symbol
cyclic prefix
transmits
sampling
wireless signal
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PCT/CN2007/000992
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English (en)
Chinese (zh)
Inventor
Zhisong Zuo
Junfeng Zhang
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Zte Corporation
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Publication of WO2008022511A1 publication Critical patent/WO2008022511A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • H04B7/2621—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using frequency division multiple access [FDMA]

Definitions

  • the present invention relates to a CP (Cyclic Prefix) parameter setting method based on Discrete Fourier Transform Spread Spectrum Orthogonal Frequency Division Multiplexing (DFT-S-OFDM) wireless signal modulation, and a wireless signal Method of launch.
  • DFT-S-OFDM Discrete Fourier Transform Spread Spectrum Orthogonal Frequency Division Multiplexing
  • OFDM DFT spread spectrum orthogonal frequency division multiplexing
  • the introduction of CP further enhances the system's ability to resist inter-symbol interference (ISI) while maintaining better orthogonality between subcarriers.
  • ISI inter-symbol interference
  • Figure 1 shows the signal processing structure of DFT-S-OFDM.
  • D ⁇ N, F d ( d-0, ..., D-1) is complemented by ND 0s before the input IFT transform.
  • the way to complement 0 is to add an equal number of 0s between each value of the ⁇ sequence, and the remaining 0s are equally divided on the left and right sides of the entire sequence, as a guard band.
  • a certain number of samples at the tail of the signal generated by the foregoing method are copied to the front of the signal as a cyclic prefix CP (Cyclic Prefix), thereby forming a complete symbol (Symbol).
  • CP Cyclic Prefix
  • the CP can protect the multipath components of the signal to prevent intersymbol interference.
  • the length of the symbol is variable depending on the value of the N point and the subcarrier spacing, and the device transmits data by transmitting consecutive symbols.
  • Figure 3 illustrates the continuous signal transmitted by the device. In each frame of DFT-S-OFDM, a plurality of symbols are included, and the lengths of the symbols may be different. Due to the nature of the digital signal, its sampling frequency is constant within the frame. Therefore, when the symbol length has a corresponding relationship with the number of sampling points occupied by the symbol, it is also consistent with the input point value IFF (Fig. 1) of the IFFT.
  • DFT-S-OFDM technology has become a popular selection technology for uplink in 3GPP UMTS wireless communication technology Long Term Evolution (LTE).
  • LTE Long Term Evolution
  • DFT-S-OFDM supports time division and frequency division multiplexing of different users (UEs).
  • UEs users
  • the CP of the first symbol of each frame of the wireless signal is longer than the CP of other symbols in the frame.
  • the bandwidth is 1.25MHz
  • the sampling rate is 1.92MHz
  • the suitable sampling point climb time is 4.17us, that is, 8 sampling points.
  • the DFT-S-OFDM uplink signals of the UE devices of different transmission bandwidths may also be frequency-multiplexed together to receive and decode for the same radio access device. See Figure 2 for a schematic diagram. Since UEs with different transmission bandwidths need to be frequency-multiplexed into the same frame, and their parameters such as sampling rate and FFT points are different, it is possible that different bandwidth CPs cannot be aligned in time. As a result, the effective CP length is reduced, and even the inter-UE is dried.
  • the technical problem to be solved by the present invention is to propose a CP parameter setting method in DFT-S-OFDM (Discrete Fourier Transform Spread Spectrum Orthogonal Frequency Division Multiplexing) wireless signal framing, so that any two different bandwidths
  • the CPs of all symbols transmitted by the UE are aligned over time or most likely aligned.
  • a method for transmitting a single carrier frequency division multiple access wireless signal is provided, wherein the wireless signal includes a plurality of symbols including a cyclic prefix.
  • the transmitting method includes: when the wireless signal frame length is set to 0.5 ms, the number of symbols is set to 8, and the sampling rate is set to 30720 times/ms: the terminal transmits the first symbol, the symbol thereof Cyclic prefix transmit samples 156 times; the terminal transmits the 2nd to 8th symbols, each symbol cyclic prefix transmits samples 124 times, or transmits the 1st and 8th symbol cyclic prefix rise and fall times total time #32 times .
  • the transmitting method further includes: when the wireless signal frame length is set to 0.5 ms, the number of symbols is set to 8, and the sampling rate is set to 15360 times/ms: the terminal transmits the first symbol, Symbol No.
  • cyclic prefix transmit samples 78 times; terminal transmits 2nd to 8th symbols, each symbol cyclic prefix transmits samples 62 times, or transmits the first and eighth symbol cyclic prefix rise and fall times total sampling 16 times .
  • the method further includes: when the wireless signal frame length is set to 0.5 ms, the number of symbols is set to 7, and the sampling rate is set to 30720 times/ms: the terminal transmits the first symbol, the symbol thereof The cyclic prefix transmits samples 160 times; the terminal transmits the 2nd to 7th symbols, each symbol cyclic prefix transmits samples 144 times, or transmits the first and seventh symbol cyclic prefixes of the total rise and fall time samples 16 times.
  • the method further includes: when the wireless signal frame length is set to 0.5 ms, the number of symbols is set to 7, and the sampling rate is set to 15360 times/ms: the terminal transmits the first symbol, the symbol thereof The cyclic prefix transmits samples 80 times; the terminal transmits the 2nd to 7th symbols, each symbol cyclic prefix transmits samples 72 times, or transmits the first and seventh symbol cyclic prefixes for the total rise and fall times of the samples 8 times.
  • the method further includes: when the wireless signal frame length is set to 1 ms, the number of symbols is set to 14, and the sampling rate is set to 30720 times/ms: the terminal transmits the first symbol, and its symbol cycle The prefix transmits samples 176 times; the terminal transmits the 2nd through 14th symbols, each symbol cyclic prefix transmits samples 144 times, or transmits the first and 14th symbol cyclic prefixes with a total of 32 samples of rise and fall times.
  • the method further includes: when the wireless signal frame length is set to 1 ms, the number of symbols is set to 14, and the sampling rate is set to 15360 times/ms: the terminal transmits the first symbol, and its symbol cycle The prefix transmits samples 88 times; the terminal transmits the 2nd through 14th symbols, each symbol cyclic prefix transmits samples 72 times, or transmits the first and 14th symbol cyclic prefixes with a total of 16 samples of rise and fall times.
  • SC-FDMA single carrier frequency division multiple access
  • DFT-S-OFDM discrete Fourier transform spread spectrum orthogonal frequency division multiplexing
  • the single carrier frequency division multiple access wireless signal is an IFDMA (interleave frequency division multiple access) wireless signal. Further, in the method, the single carrier frequency division multiple access wireless signal is replaced by an OFDMA (Orthogonal Frequency Division Multiple Access) radio signal.
  • the invention also provides a method for setting a cyclic prefix parameter of a discrete Fourier transform spread spectrum orthogonal frequency division multiplexing radio signal framing, which comprises the following steps: setting a reference cyclic prefix length adopted by a UE's transmitting interface:
  • each character in the frame is lc xF
  • the cyclic prefix length of the symbol is set to L "" samples, and the cyclic prefix length of the remaining symbols is set.
  • the number of symbols in the frame, a is the sampling frequency.
  • the present invention determines the length of the CP of each symbol in a frame by a given method and sets the CP so that the UEs with different transmission bandwidths are in the CP and the same system. The drop and rise reservation times of the sample points are aligned.
  • the setting of the CP is also relatively uniform in each frame.
  • the parameters set by the present invention enable the ability of each symbol to resist multipath interference during transmission to be maximized. This method avoids blind detection during random access.
  • the sampling rate of the UEs of different bandwidths is multiplied, the ratio of the number of CP points in different bandwidths is proportionally multiplied, which simplifies the baseband processing and simplifies the setting of the air interface.
  • FIG. 1 is a schematic diagram of subcarrier fast shot of DFT-S-OFDM
  • FIG. 2 is a complete DFT-S-OFDM signal generation diagram
  • 4 is a schematic diagram of the use of an application device according to the present invention
  • FIG. 5 is a structural diagram of a frame in an embodiment of the present invention.
  • the scenario applied by the present invention is: A wireless access system, which uses DFT-S-OFDM signals as uplink wireless transmission multiplexing, and the uplink access UEs have different transmission bandwidths, but are multiplied.
  • some parameters are first introduced: sampling frequency, length of the frame, number of symbols, length of the symbol of the CP (called "block"), UE in multiplexing The minimum bandwidth of the transmission, and the fall and rise reservation time of the sample points determined according to the sampling frequency and the minimum bandwidth.
  • the sampling frequency is different according to the UE's transmission bandwidth.
  • the other parameters are the same for all UEs. Expressed by symbols as: sampling frequency.
  • S is the total number of symbols in the frame.
  • the present invention uses the following steps to set the length of each CP in a frame for a radio transmission interface of a UE of different transmission bandwidth:
  • Reference CP length is the frame length to remove all block lengths, then remove the sample point's falling and rising reservation time, and then evenly distribute it to each frame.
  • the length of the first CP is the reference CP length plus the drop and rise reservation time of the sample points.
  • the other CPs are set to the reference CP length, that is: set the first symbol in the frame.
  • CP length Lc 1 L c + L r , cp length of all other symbols
  • the CP of each symbol s in the frame is xF a j samples; otherwise,
  • the minimum transmission bandwidth of the UE and its corresponding sampling rate determine the falling and rising reservation time of the sampling point, and the number of sampling points of other higher bandwidths in the same reserved time is increased by the sampling frequency. Increase the strength.
  • the symbol corresponding to the CP with x +1 + 1 sample point length in step 3 is uniformly selected at equal intervals within the frame.
  • D. Although the lengths of the intra-symbols are not equal, since the system is used in the same radio transmission scenario, the multipath delay spread for each symbol is the same.
  • the CP set by this method provides the same as possible multipath suppression capability for each symbol, so that the resource utilization of the sampling point is maximized.
  • the effect of setting the CP is optimal when each CP in the frame has the same length after removing the falling and rising reservation time of the sampling point.
  • E. When the UE performs uplink random access, because the CP lengths of different transmission bandwidths are aligned, the radio access device does not need to know the bandwidth type of the UE in advance, thereby avoiding blind detection.
  • FIG. 4 shows an access system according to an embodiment of the present invention, including a wireless access device and a handheld user equipment (UE) thereof.
  • the present invention is applied to a parameter portion of a DFT-S-OFDM uplink signal of a UE.
  • UE handheld user equipment
  • the UE transmitting the uplink allocated bandwidth can be configured as one of the following values: 10 MHz, 15 MHz, 20 MHz. This set of values is an integer multiple of 5M, which facilitates flexible bandwidth allocation. Bandwidth can be configured with different 3 sets of values. The corresponding sampling rates are shown in Table 1. The sampling rate is proportional to the allocated bandwidth. In the specific embodiment 1, the lOMHz UE is the minimum bandwidth of the uplink transmission, and the frame length is 0.5 ms. Through the method provided by this case, the set sampling point drop and rise reserve time is 8 sampling points at 10M, which is 1/1920ms. Table 1 :
  • Applying the steps described above yields a divisor of each symbol sample value and corresponding time length for different bandwidths (see Table 1).
  • the number of sampling points corresponding to the CPs of the 10M and 20M UEs is also strictly proportional to the different uplink allocated bandwidth/sampling frequency.
  • the 15M UE is approximately proportional to other bandwidth UEs, and the CPs used are: (4.60/106), (4.12/95), (4.08/94), (4.12/95), (4.08/94), (4.12 /95), (4.08/94), (4.12/95).
  • the terminal transmits the first symbol, and the symbol cyclic prefix transmits the sample 142 times; the terminal transmits the second to eighth symbols, each The symbol cyclic prefix transmits samples 126 times; of course, it is not excluded that the symbol in which the longer cyclic prefix is located is the last symbol, or the rising and falling segments are respectively assigned to the first symbol and the last symbol, respectively.
  • the number of transmit samples of the corresponding cyclic prefix can be determined according to Table 1 and so on.
  • the number of samples included in the CP is a multiple relationship. This feature can be used very well for devices generated at certain clock frequencies.
  • the sampling frequency is actually also derived from the clock frequency.
  • the usual method of conversion is the method of frequency multiplication and frequency division.
  • the bandwidth selection, the minimum transmission bandwidth, the sampling frequency, the frame length, the block length (i.e., the symbol length without the CP), the modulation mode of the signal, and the like can be transformed.
  • the minimum bandwidth transmitted by the UE in the frequency division multiplexing is 5 MHz.
  • the principle of setting the CP length is still the above method. That is, based on the 5MHz sampling point rise and fall time, the sampling rise and fall times of other bandwidths are set. According to the foregoing definition, the minimum bandwidth transmitted by the UE is 5MHz, the frame length is 0.5ms, and the block is 8. The set sampling point has a falling and rising retention time of 8 samples at 5M, which is l/1920ms. Additional emission methods can be constructed using the same CP setup method, see Table 2: Table 2:
  • the terminal transmits the first symbol, and its symbol cyclic prefix transmits the sample 142 times; the terminal transmits the second to eighth symbols, each symbol cyclic prefix Sampling 126 times; It is of course not excluded that the symbol in which the longer cyclic prefix is located is the last symbol, or that the rising and falling divisions are respectively assigned to the first symbol and the last symbol, respectively, but the rising and falling emission samples are said. A total of 32 times. For other allocated bandwidths, the number of transmit samples of the corresponding cyclic prefix can be determined according to Table 2 and so on.
  • the minimum bandwidth transmitted by the UE in the frequency division multiplexing is 5 MHz, and the frame length is lms.
  • the principle of setting the CP length is still the above method. That is, based on the 5MHz sampling point rise and fall time, the sampling rise and fall times of other bandwidths are set.
  • the set falling point and rising reserve time are 8 sampling points at 5M, which is l/1920ms; the number of blocks is 14. Additional emission methods can be constructed using the same CP setting method, see Table 3: Table 3:
  • the terminal transmits the first symbol, and its symbol cyclic prefix transmits the sampling 176 times; the terminal transmits the 2nd to 14th symbols, each symbol cycle
  • the prefix transmits samples 144 times; of course, it does not exclude that the symbol in which the longer cyclic prefix is located is the last symbol, or the rising and falling segments are respectively assigned to the first symbol and the last symbol, respectively.
  • the rising and falling emission samples were 32 times in total.
  • the number of transmit samples of the corresponding cyclic prefix can be determined according to Table 3 and so on.
  • the minimum bandwidth transmitted by the UE in the frequency division multiplexing is 10 MHz, and the frame length is lms.
  • the principle of setting the CP length is still the above method. That is, based on the rising and falling time of the sampling point of 10 MHz, the sampling rise and fall time of other bandwidths is set. The set sampling point's falling and rising retention time is 8 sampling points at 10M, which is l/1920ms; the number of blocks is 7. Additional emission methods can be constructed using the same CP setup method, see Table 3: Table 4:
  • the terminal transmits the first symbol, and its symbol cyclic prefix transmits the sampling 160 times; the terminal transmits the 2nd to 7th symbols, each symbol cyclic prefix Sampling is performed 144 times; of course, it is not excluded that the symbol in which the longer cyclic prefix is located is the last symbol, or the rising and falling divisions are respectively assigned to the first symbol and the last symbol, respectively, but said rising And the falling emission samples were 16 times in total.
  • the number of transmitted samples of the corresponding cyclic prefix can be determined according to Table 4 and so on.
  • the modulation mode of the signal is IFDMA (interleave frequency division multiple access system.
  • IFDMA interleave frequency division multiple access system.
  • the principle of setting the CP length is still the above method.
  • the above description is only a preferred embodiment of the present invention, and is not used to limit the present invention.
  • the invention may be variously modified and changed by those skilled in the art, and any modifications, equivalents, improvements, etc., which are made within the spirit and principles of the present invention, should be included in the present invention. Within the scope of protection.

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

Abstract

Un procédé de transmission d'un signal FDMA simple porteuse (SC) est décrit. Le signal SC-FDMA comprend une pluralité de symboles à préfixe cyclique (CP). Lors de la configuration de la longueur de trame, du nombre de symboles, de la vitesse d'échantillonnage en six modes, le terminal détermine un nombre d'échantillonnages CP pour chaque symbole ou le nombre total d'échantillonnages CP du premier symbole et du dernier symbole lors de la liaison ascendante et descendante. Les paramètres correspondant aux six modes sont : 1) lorsque la longueur de trame est 0,5 ms, le nombre de symboles correspond à 8, la vitesse d'échantillonnage est 30'720 fois/ms, le nombre d'échantillonnages CP pour le premier symbole est 156, pour les deuxième à huitième symboles 124, le nombre total d'échantillonnages CP pour les premier et huitième symboles pendant la liaison ascendante et descendante est 32; 2) lorsque la longueur de trame est 0,5, le nombre de symboles est 8, la vitesse d'échantillonnage est 15'360 fois/ms, le nombre d'échantillonnages CP pour le premier symbole est 78, pour les deuxième à huitième symboles 62, le nombre total d'échantillonnages CP pour les premier et huitième symboles pendant la liaison ascendante et descendante est 16; 3) lorsque la longueur de trame est 0,5, le nombre de symboles est 7, la vitesse d'échantillonnage est 30'720 fois/ms, le nombre d'échantillonnages CP pour le premier symbole est 160, pour les deuxième à septième symboles 144, le nombre total d'échantillonnages CP pour les premier et septième symboles pendant la liaison ascendante et descendante est 16; 4) lorsque la longueur de trame est 0,5, le nombre de symboles est 7, la vitesse d'échantillonnage est 15'360 fois/ms, le nombre d'échantillonnages CP pour le premier symbole est 80, le nombre d'échantillonnages CP pour les deuxième et septième symboles est 72, le nombre total d'échantillonnages CP pour les premier et septième symboles pendant la liaison ascendante et descendante est 8; 5) lorsque la longueur de trame est 1ms, le nombre de symboles correspond à 14, la vitesse d'échantillonnage est 30'720 fois/ms, le nombre d'échantillonnages CP pour le premier symbole est 176, le nombre d'échantillonnages CP pour les deuxième à 14e symboles est 144, le nombre total d'échantillonnages CP pour les premier et 14e symboles pendant la liaison ascendante et descendante est 32; 6) lorsque la longueur de trame est 1ms, le nombre de symboles est 14, la vitesse d'échantillonnage est 15'360 fois/ms, le nombre d'échantillonnages CP pour le premier symbole est 88, le nombre d'échantillonnages CP pour les deuxième à 14e symboles est 72, le nombre total d'échantillonnages CP pour le premier et le huitième symboles pendant la liaison ascendante et descendante est 16. Un procédé de configuration des paramètres à préfixe cyclique dans une trame de signal radio est également décrit.
PCT/CN2007/000992 2006-08-17 2007-03-27 Procédé de configuration de paramètres à préfixe cyclique pour trame radio et signal radio de transmission WO2008022511A1 (fr)

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CNB2006100621816A CN100571240C (zh) 2006-08-17 2006-08-17 一种无线信号成帧的循环前缀参数设置方法

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US20100085955A1 (en) * 2008-09-23 2010-04-08 Qualcomm Incorporated Transmit diversity for sc-fdma

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CN107682295B (zh) * 2016-08-02 2020-09-29 中兴通讯股份有限公司 信息传输、接收方法及装置、通信系统
CN110519197B (zh) * 2017-08-08 2022-03-22 北京紫光展锐通信技术有限公司 时域信号预处理方法及装置、存储介质、接收机

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CN1747462A (zh) * 2005-10-20 2006-03-15 清华大学 一种正交频分复用系统信号发送及接收方法
WO2006029313A1 (fr) * 2004-09-09 2006-03-16 Agere Systems Inc. Procede et appareil pour l'obtention d'un meilleur rendement dans un systeme de communication etendu a antennes multiples
US20060067412A1 (en) * 2004-09-29 2006-03-30 Sigang Qiu Multicarrier receivers and methods for detecting cyclic prefixes having unknown lengths

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Publication number Priority date Publication date Assignee Title
WO2006029313A1 (fr) * 2004-09-09 2006-03-16 Agere Systems Inc. Procede et appareil pour l'obtention d'un meilleur rendement dans un systeme de communication etendu a antennes multiples
US20060067412A1 (en) * 2004-09-29 2006-03-30 Sigang Qiu Multicarrier receivers and methods for detecting cyclic prefixes having unknown lengths
CN1747462A (zh) * 2005-10-20 2006-03-15 清华大学 一种正交频分复用系统信号发送及接收方法

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100085955A1 (en) * 2008-09-23 2010-04-08 Qualcomm Incorporated Transmit diversity for sc-fdma
US9608780B2 (en) * 2008-09-23 2017-03-28 Qualcomm Incorporated Transmit diversity for SC-FDMA

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