WO2013091242A1 - Procédé d'émission et de réception de signal, dispositif et système d'émission/réception de signal - Google Patents

Procédé d'émission et de réception de signal, dispositif et système d'émission/réception de signal Download PDF

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Publication number
WO2013091242A1
WO2013091242A1 PCT/CN2011/084545 CN2011084545W WO2013091242A1 WO 2013091242 A1 WO2013091242 A1 WO 2013091242A1 CN 2011084545 W CN2011084545 W CN 2011084545W WO 2013091242 A1 WO2013091242 A1 WO 2013091242A1
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WO
WIPO (PCT)
Prior art keywords
downlink signal
signal
downlink
weight
beamforming weight
Prior art date
Application number
PCT/CN2011/084545
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English (en)
Chinese (zh)
Inventor
张劲林
Original Assignee
华为技术有限公司
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 华为技术有限公司 filed Critical 华为技术有限公司
Priority to PCT/CN2011/084545 priority Critical patent/WO2013091242A1/fr
Priority to CN201180070912.0A priority patent/CN103563265B/zh
Publication of WO2013091242A1 publication Critical patent/WO2013091242A1/fr

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Classifications

    • 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
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0617—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal for beam forming

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a signal transmitting and receiving method, a device, and a signal transceiving system.
  • a user equipment In a wireless system, a user equipment (UE) generally uses a Common Reference Signal (CRS), for example, a cell reference signal in Long Term Evolution (LTE) as a demodulation public information. Reference signal. Since the common reference signal serves all terminals in the cell, the common reference signal is transmitted omnidirectionally within the cell coverage area.
  • CRS Common Reference Signal
  • LTE Long Term Evolution
  • a beamforming method is generally used, and the signal energy sent by a certain UE is concentrated in a narrow range, thereby improving the downlink signal strength received by the UE.
  • the signal transmission range after beamforming is different from the common reference signal, the signal after beamforming differs from the channel experienced by the common reference signal. If the UE still uses the common reference signal as the reference signal for demodulation, there may be a phase difference between the demodulated downlink signal and the actual downlink signal, resulting in a demodulation error.
  • Embodiments of the present invention provide a signal transmitting and receiving method, a device, and a signal transceiving system.
  • the phase difference between the downlink signal demodulated by the user equipment and the actual downlink signal is reduced.
  • an embodiment of the present invention provides a signaling method, including:
  • the modulated downlink signal is transmitted to the terminal, and the modulated downlink signal is beamformed using the corrected beamforming weight.
  • the embodiment of the invention further provides a signal receiving method, including:
  • the following line common reference signal is used as a reference to demodulate the downlink signal.
  • the embodiment of the present invention further provides a base station, including:
  • a modulator for modulating a downlink signal to be transmitted
  • a processor configured to determine a beamforming weight according to the modulated downlink signal, and modify the beamforming weight according to the channel response measured on the uplink channel and the weight of the downlink common reference signal;
  • a transmitter configured to send the modulated downlink signal to the terminal, where the modulated downlink signal is beamformed by using the modified beamforming weight.
  • the embodiment of the invention further provides a terminal, including:
  • a receiver configured to receive a downlink signal sent by the base station, where the downlink signal uses a modified beamforming weight to perform beamforming, where the modified beamforming weight is determined by the base station according to the channel response measured on the uplink channel and the downlink The weight of the common reference signal, and the beamforming weight determined by the modulated downlink signal is corrected and obtained;
  • the demodulator is used for demodulating the downlink signal based on the following common reference signal.
  • the embodiment of the present invention further provides a signal transceiving system, including: a base station and a terminal; the base station is configured to: modulate a downlink signal to be transmitted; and determine a beamforming weight according to the modulated downlink signal; Correcting the beamforming weight value by using a channel response measured on the uplink channel and a weight of the downlink common reference signal; transmitting the modulated downlink signal to the terminal, where the modulated downlink signal adopts the corrected beamforming right Value for beamforming;
  • the terminal is configured to: receive a downlink signal sent by the base station, where the downlink signal uses the modified beamforming weight to perform beamforming, and the modified beamforming weight is determined by the base station according to the channel response measured on the uplink channel, and the downlink
  • the weight of the common reference signal is corrected for the beamforming weight determined by the modulated downlink signal; and the downlink signal is demodulated based on the downlink common reference signal.
  • the base station side corrects the beamforming weight according to the channel response measured on the uplink channel and the weight of the common reference signal, thereby reducing the terminal solution.
  • FIG. 1 is a flowchart of an embodiment of a signal sending method provided by the present invention
  • FIG. 2 is a schematic diagram of an azimuth angle of a base station transmit antenna array element and a terminal;
  • FIG. 3 is a flow chart of an embodiment of a signal receiving method provided by the present invention.
  • FIG. 4 is a schematic structural diagram of an embodiment of a base station for performing the foregoing signal sending method according to the present invention
  • FIG. 5 is a schematic structural diagram of an embodiment of a terminal for performing the above signal receiving method according to the present invention.
  • FIG. 6 is a schematic structural diagram of an embodiment of a signal transceiving system for performing the above-described signal transmitting method and signal receiving method according to the present invention.
  • DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The technical solutions in the embodiments of the present invention will be described below with reference to the accompanying drawings in the embodiments of the present invention. It is clear that the described embodiments are only a part of the embodiments of the invention, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without departing from the inventive scope are the scope of the present invention.
  • FIG. 1 is a flowchart of an embodiment of a signal sending method according to the present invention. As shown in FIG. 1, the method includes:
  • the execution body of the above steps is a base station.
  • the terminal involved in this embodiment may be a user equipment UE such as a mobile terminal.
  • the base station can adopt various existing modulation methods for the modulation of the downlink signal, for example, Quadrature Amplitude Modulation (QAM) and Quadrature Phase Shift Keying (QPSK). Etc., it is not intended to limit the invention.
  • QAM Quadrature Amplitude Modulation
  • QPSK Quadrature Phase Shift Keying
  • the base station can determine the beamforming weight according to the modulated downlink signal, and can adopt various existing methods, such as a direction estimation method or a eigenvalue method.
  • the following uses the direction estimation method as an example to describe the base station determining the beamforming weight according to the modulated downlink signal.
  • Figure 2 shows a linear array of N-array equally spaced d.
  • the base station first needs to obtain the angle ⁇ between the normal direction of the array antenna and the terminal, and then calculate the beamforming weight according to the following formula.
  • the beam forming weight is the weight that makes the terminal receive the strongest downlink signal strength:
  • N is the number of array elements of the base station transmit antenna
  • ⁇ is the array element
  • the spacing, ⁇ is the angle between the normal direction of the array antenna and the terminal, and is the wavelength of the downlink signal carrier.
  • the method for determining the beamforming weight of the base station is described by using the direction estimation method as an example. However, the method is not limited to the present invention. In fact, the base station may also determine the beamforming weight by using various existing methods.
  • the downlink common reference signal for omnidirectional transmission If the number of antennas transmitting the downlink signal is ⁇ , the downlink common reference signal for omnidirectional transmission
  • the weight of the cell reference signal (for example, the cell reference signal in LTE) is N x 1 , and the beamforming weight determined according to the modulated downlink signal is a vector ⁇ ⁇ 1 .
  • the channel response of the downlink channel transmitting the downlink signal is represented by a vector H of ⁇ N , where M is the number of antennas receiving the downlink signal. Then, the channel response measured by the terminal on the downlink common reference signal is.
  • the following common reference signal of the terminal is used as a reference. Based on the maximum ratio combining, the demodulated downlink signal is:
  • S is a downlink signal received by the terminal, and is a downlink signal obtained after demodulation
  • HW D is a channel response measured by the terminal on the downlink signal.
  • the base station can measure on the uplink channel.
  • the channel response H thereby correcting the beamforming weight ⁇ according to the weight of the channel response and the common reference signal on the uplink channel, thereby adjusting the phase of the wide ( ⁇ ) by correcting the beamforming weight ⁇ .
  • Downlink signal demodulated by the terminal Real number therefore, the terminal demodulates
  • the phase difference between the downlink signal and the actual downlink signal is mainly determined by ( ⁇ ⁇ ⁇ ).
  • the phase of ( ⁇ ⁇ ) can be adjusted to reduce the downlink after demodulation of the terminal.
  • the phase difference between the signal and the actual downstream signal It is also possible to make ( ⁇ ( ) a real number by correcting the beamforming weight ⁇
  • Ringing reducing the phase difference between the downlink signal after demodulation of the terminal and the actual downlink signal.
  • the modified beamforming weight may be used to perform beamforming on the downlink signal to be transmitted, and the downlink signal energy sent to the terminal is concentrated in a certain range to improve terminal receiving.
  • Array gain Since the base station performs beamforming on the downlink signal to be transmitted by using the modified beamforming weight, the phase amplitude in the ⁇ is adjusted, thereby reducing the influence on the phase of the downlink signal S received by the terminal, and reducing the terminal. The phase difference between the demodulated downlink signal and the actual downlink signal.
  • the amplitude modulation of the downlink signal may actually be included.
  • the downlink after demodulation of the terminal may also be reduced. The amplitude deviation between the signal and the actual downstream signal.
  • the base station side corrects the beamforming weight according to the channel response measured on the uplink channel and the weight of the common reference signal, thereby reducing the downlink signal and the actual downlink after the terminal is demodulated.
  • the phase difference between the signals is a simple integer value.
  • FIG. 3 is a flowchart of another embodiment of a signal receiving method according to the present invention. As shown in FIG. 2, the method includes:
  • S201 Receive a downlink signal sent by the base station, where the downlink signal uses a modified beamforming weight to perform beamforming, where the modified beamforming weight is determined by the base station according to the channel response measured on the uplink channel and the downlink common reference signal. Value, the beam determined for the modulated downlink signal Forming weights for correction acquisition;
  • S202 The following common reference signal is used as a reference to demodulate the downlink signal.
  • the execution subject of the above steps is a terminal, and specifically may be a user equipment UE such as a mobile terminal.
  • the base station can adopt various modulation methods, for example, modulation methods such as QAM and QPSK to modulate the downlink signal to be transmitted.
  • modulation methods such as QAM and QPSK
  • the base station further determines the beamforming weight according to the direction estimation method or the eigenvalue method according to the modulated downlink signal.
  • the weight of the downlink common reference signal used for omnidirectional transmission is a vector ⁇ ⁇ 1
  • the beamforming weight determined according to the modulated downlink signal is a vector of ⁇ ⁇ 1 ⁇ .
  • the channel response of the downlink channel transmitting the downlink signal is represented by a vector H of ⁇ N , where M is the number of antennas receiving the downlink signal.
  • the channel response measured by the terminal on the downlink common reference signal is R.
  • the following common reference signal of the terminal is used as a reference. Based on the maximum ratio combining, the demodulated downlink signal is:
  • S is a downlink signal received by the terminal, and is a downlink signal obtained after demodulation
  • HW D is a channel response measured by the terminal on the downlink signal.
  • the base station can measure the channel response H on the uplink channel, thereby being based on the uplink channel. Measuring the channel response and the weight of the common reference signal
  • the terminal After receiving the downlink signal, the terminal performs beamforming on the downlink signal with the modified beamforming weight. Therefore, the terminal can demodulate the downlink signal by using the common reference signal as a reference, as a feasible implementation manner.
  • the line signal is demodulated.
  • S is the downlink signal received by the terminal
  • r is the downlink signal obtained by the terminal after demodulation
  • H is the channel response measured by the terminal on the downlink common reference signal
  • H is the channel response measured by the terminal on the downlink signal. Due to the downlink signal demodulated by the terminal i ⁇ r
  • the phase of ( ⁇ ) ( ⁇ ) has been adjusted, even ( ⁇ ) ( ⁇ ) can be a real number. Therefore, the influence on the phase of the downlink signal s received by the terminal is reduced, and the downlink signal obtained after demodulation is reduced.
  • the base station side corrects the beamforming weight according to the channel response of the detected uplink channel and the weight of the common reference signal.
  • the terminal demodulates the downlink signal by using the following common reference signal as a reference.
  • the phase difference between the demodulated downlink signal and the actual downlink signal is reduced.
  • the beamforming weight determined by the base station according to the demodulated downlink signal is ⁇
  • the channel response measured by the base station on the uplink channel is H
  • the downlink common reference signal is The weight of the beam is ⁇
  • the corrected beamforming weight of the base station can be:
  • H is the channel response measured by the base station on the uplink channel
  • ⁇ is the weight of the downlink common reference signal
  • ⁇ is the beamforming weight
  • ⁇ is the amplitude adjustment factor
  • the value of ⁇ is in HW R f To
  • the beamforming weight is repaired.
  • the transmit power of the downlink signal is unchanged after the correction of the front and the beamforming weights. Therefore, in the implementation scenario where the transmit power of the downlink signal is a decisive factor limiting the performance of the system, that is, an application scenario requiring high coverage of the base station Next, ⁇ can take I (H ⁇ ⁇ (HW R d, the downlink signal obtained by the terminal after demodulation is transmitted by the base station
  • the amplitude deviation There is an amplitude deviation between the downlink signals. If the modulation of the downlink signal by the base station does not involve amplitude modulation, then the amplitude deviation does not affect the downlink signal obtained by the terminal after demodulation, but if the modulation of the downlink signal by the base station involves amplitude modulation, then this The amplitude deviation will demodulate the terminal.
  • the downlink signal to it has a certain impact. Therefore, if the modulation of the downlink signal by the base station does not involve amplitude modulation, then If the base station downlink modulated signal involves an amplitude modulation, it may take ⁇ 1 ⁇ 2 ⁇ . However, when the ⁇ is used, the transmission power of the downlink signal is affected, and therefore, it can be applied to an application scenario where the coverage of the base station is not high.
  • the terminal may use the orthogonality of the two signals to solve the two signals.
  • the base station uses the Space Time Block Code (STBC) to transmit orthogonal downlink signals on two consecutive time slices.
  • STBC Space Time Block Code
  • the downlink signal transmitted by the base station on the first time slice is, on the second time slice.
  • the downlink signal transmitted is -4.
  • the downlink signals demodulated by the terminal on two time slices are:
  • the amplitude adjustment factor can be determined according to the modulation mode of the base station, the coverage requirement of the base station, the system interference situation, and the manner in which the base station transmits the downlink signal.
  • ⁇ can be in
  • the modulation of the downlink signal to be transmitted does not involve amplitude modulation, the value of the "can approach 0, that is, the value of "can be infinitely close to 0," Because the amplitude does not carry useful information, therefore, the value of "approximating to 0 can improve the transmission power of the downlink signal, thereby improving the downlink signal reception performance of the system and facilitating the demodulation of the downlink signal.
  • the modulation of the downlink signal to be transmitted involves amplitude modulation, and the value of "can be approached to 1.
  • the base station may further influence the demodulation of the terminal or other system performance indicators according to the transmission power of the downlink signal, and the phase-to-terminal solution of the downlink signal. Determine the value of the impact of the impact of other system performance indicators.
  • the transmit power of the downlink signal affects the demodulation of the terminal or other system performance indicators, and the phase-to-terminal demodulation of the downlink signal Or the impact of other system performance indicators can be measured in a linear proportional relationship, when the downlink signal's transmit power affects the terminal's demodulation or other system performance indicators, and the downlink signal's phase-to-terminal demodulation or other system performance indicators When the effects are roughly the same, "can take 0.5. It can be understood that the proportional relationship between the transmission power of the downlink signal on the demodulation of the terminal or other system performance indicators, and the influence of the phase of the downlink signal on the demodulation of the terminal or other system performance indicators may be determined by the base station according to the system. The actual situation is determined, and then the "value, for example,” can be determined to be between 0.5 and 1, so as to avoid the deviation of the amplitude between the downlink signal received by the terminal and the pilot affecting the demodulation quality of the downlink signal.
  • the transmit power of the downlink signal is a determining factor limiting system performance
  • the value of "the value may approach 0.
  • the transmit power of the downlink signal is a decision that limits system performance.
  • the factor may be that the transmit power of the downlink signal has a decisive influence on the terminal receiving the downlink signal or demodulating the downlink signal. For example, in an implementation scenario where the terminal is far away from the base station, if the transmit power of the downlink signal is small, the terminal receives The downlink signal may be weak. In this case, the terminal cannot even demodulate the downlink signal.
  • the value can be close to 0, so that the transmission power of the downlink signal is maximized; Downlink signal transmission power Instead of limiting the performance of the system, the value of "can be closer to 1.
  • the base station can determine the "according to the influence of the amplitude and phase of the downlink signal on the performance of the system.” value.
  • the value of a may approach 1.
  • the base station may correct the amplitude error regardless of the phase difference, and then the base station, where H is on the uplink.
  • the channel response measured on the channel, ⁇ is the weight of the downlink common reference signal, which is the beamforming weight, which is the corrected beamforming weight.
  • the beamforming weight which is the corrected beamforming weight.
  • the storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM), or a random access memory (RAM).
  • the base station includes: a modulator 11, a processor 12, and a transmitter 13; and a modulator 11 Modulating the downlink signal to be transmitted;
  • the processor 12 determines a beamforming weight according to the modulated downlink signal, and corrects the beamforming weight according to the channel response measured on the uplink channel and the weight of the downlink common reference signal;
  • the transmitter 13 is configured to send the modulated downlink signal to the terminal, and the modulated downlink signal performs beamforming by using the modified beamforming weight.
  • the base station provided by the present invention for performing the above signal transmission method is still another embodiment,
  • H is the channel response measured on the uplink channel
  • W R is the weight of the downlink common reference signal
  • ⁇ is the beamforming weight
  • ⁇ is the amplitude adjustment factor
  • the value of ⁇ is
  • ⁇ Determine the amplitude adjustment factor, where "is a compromise factor, the value is between 0 and 1," is determined according to the transmission mode, modulation mode or transmission power of the downlink signal.
  • the processor 12 is further configured to: if the modulation of the downlink signal to be sent by the modulator 11 does not involve amplitude modulation, determine that the value of the "approaching is close to 0, otherwise, determining the value of the approach is approaching If the modulator 11 uses non-amplitude modulation of the downlink signal, it is determined that the value of the "negative value approaches 0; or, if the transmitter 13 transmits the power of the downlink signal, the system performance is limited. The determinant, the value of the "becomes close to 0, otherwise the value of the "approximate to 1"; or, if the transmitter 13 transmits the downlink signal by using transmit diversity, the " The value is close to 1.
  • H is the channel response measured on the uplink channel
  • ⁇ is the weight of the downlink common reference signal
  • ⁇ is the beamforming weight, which is the corrected beamforming weight
  • the base station provided by the embodiment of the present invention is an execution device of the signal sending method provided by the present invention.
  • the specific process of the method for transmitting the signal refer to the embodiment of the signal sending method, which is not described again.
  • the base station provided by the embodiment of the present invention is based on the channel response and the common parameter measured on the uplink channel.
  • the weight of the test signal is modified to correct the beamforming weight, thereby reducing the phase difference between the demodulated downlink signal and the actual downlink signal.
  • FIG. 5 is a schematic structural diagram of an embodiment of a terminal for performing the foregoing signal receiving method according to the present invention. As shown in FIG. 5, the terminal includes: a receiver 21 and a demodulator 22;
  • the receiver 21 is configured to receive a downlink signal sent by the base station, where the downlink signal uses the modified beamforming weight to perform beamforming, where the modified beamforming weight is determined by the base station according to the channel response measured on the uplink channel and the downlink common Correcting the beamforming weight determined by the modulated downlink signal by using the weight of the reference signal;
  • the demodulator is used for demodulating the downlink signal based on the following common reference signal.
  • the adjusted downlink signal, H ⁇ is the channel response measured by the terminal on the downlink common reference signal
  • HW is the channel response measured by the terminal on the downlink signal.
  • the terminal provided by the embodiment of the present invention is an execution device of the signal receiving method provided by the present invention.
  • For the specific process of the signal receiving method refer to the embodiment of the signal receiving method, which is not described again.
  • the base station side corrects the beamforming weight according to the channel response measured on the uplink channel and the weight of the common reference signal, and can reduce the downlink signal between the terminal and the actual downlink signal.
  • the phase difference is the case difference.
  • Figure 6 is a schematic structural diagram of an embodiment of a signal transceiving system for performing the above-mentioned signal transmitting method and signal receiving method, as shown in Figure 6, the signal transceiving provides base station 1 and terminal 2;
  • the base station 1 is configured to: modulate a downlink signal to be transmitted; determine a beamforming weight according to the modulated downlink signal; perform beamforming weight according to a channel response measured on the uplink channel, and a weight of the downlink common reference signal Correction; transmitting modulated downlink signal to the terminal, modulation The subsequent downlink signal is beamformed using the corrected beamforming weight;
  • the terminal 2 is configured to: receive a downlink signal sent by the base station, where the downlink signal uses the modified beamforming weight to perform beamforming, and the modified beamforming weight is determined by the base station according to the channel response measured on the uplink channel, and the downlink common reference signal.
  • the weight value is used to correct the beamforming weight determined by the modulated downlink signal; the following common reference signal is used as a reference to demodulate the downlink signal.
  • the base station side may modify the beamforming weight according to the channel response measured on the uplink channel and the weight of the common reference signal, thereby reducing the downlink signal and the actual demodulation of the terminal.

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

Abstract

Les modes de réalisation de la présente invention portent sur un procédé d'émission et de réception de signal, un dispositif et sur un système d'émission/réception de signal. Le procédé d'émission consiste à : moduler le signal de liaison descendante à émettre; conformément au signal de liaison descendante modulé, confirmer le poids de formation de faisceau; en fonction d'une réponse de canal mesurée dans un canal de liaison montante et au poids d'un signal de référence commun de liaison descendante, corriger le poids de formation de faisceau; émettre le signal de liaison descendante modulé à destination d'un terminal, le signal de liaison descendante modulé adoptant le poids de formation de faisceau corrigé pour effectuer une formation de faisceau. Le procédé et d'émission et de réception de signal, le dispositif et le système d'émission/réception de signal décrits par les modes de réalisation de la présente invention réduisent la différence de phase entre le signal de liaison descendante modulé par le terminal et le signal de liaison descendante réel.
PCT/CN2011/084545 2011-12-23 2011-12-23 Procédé d'émission et de réception de signal, dispositif et système d'émission/réception de signal WO2013091242A1 (fr)

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PCT/CN2011/084545 WO2013091242A1 (fr) 2011-12-23 2011-12-23 Procédé d'émission et de réception de signal, dispositif et système d'émission/réception de signal
CN201180070912.0A CN103563265B (zh) 2011-12-23 2011-12-23 信号发送、接收方法、设备和信号收发系统

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PCT/CN2011/084545 WO2013091242A1 (fr) 2011-12-23 2011-12-23 Procédé d'émission et de réception de signal, dispositif et système d'émission/réception de signal

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CN102082594B (zh) * 2009-11-30 2013-09-11 华为技术有限公司 波束形成方法、装置和发射系统
CN102111203B (zh) * 2011-03-04 2013-11-06 西安交通大学 Td-lte系统中基于时频域预处理的特征波束形成方法

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