WO2004013988A1 - Procedes de selection d'antennes d'emission dans un environnement de communication a antennes multiples et procedes d'emission et de reception du signal - Google Patents

Procedes de selection d'antennes d'emission dans un environnement de communication a antennes multiples et procedes d'emission et de reception du signal Download PDF

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Publication number
WO2004013988A1
WO2004013988A1 PCT/CN2003/000628 CN0300628W WO2004013988A1 WO 2004013988 A1 WO2004013988 A1 WO 2004013988A1 CN 0300628 W CN0300628 W CN 0300628W WO 2004013988 A1 WO2004013988 A1 WO 2004013988A1
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WIPO (PCT)
Prior art keywords
antennas
transmitting
signal
antenna
base station
Prior art date
Application number
PCT/CN2003/000628
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English (en)
Chinese (zh)
Inventor
Lei Zhou
Lixin Sun
Yuehua Chen
Zhibin Zheng
Original Assignee
Huawei Technologies Co., Ltd
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
Priority claimed from CN 02125818 external-priority patent/CN1210969C/zh
Priority claimed from CN 02126038 external-priority patent/CN1266856C/zh
Priority claimed from CN 02125481 external-priority patent/CN1214673C/zh
Application filed by Huawei Technologies Co., Ltd filed Critical Huawei Technologies Co., Ltd
Priority to AU2003255091A priority Critical patent/AU2003255091A1/en
Publication of WO2004013988A1 publication Critical patent/WO2004013988A1/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
    • H04B7/0686—Hybrid systems, i.e. switching and simultaneous transmission
    • H04B7/0691—Hybrid systems, i.e. switching and simultaneous transmission using subgroups of transmit antennas
    • 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
    • H04B7/0602—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 antenna switching
    • H04B7/0608—Antenna selection according to transmission parameters
    • H04B7/061—Antenna selection according to transmission parameters using feedback from receiving side
    • 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
    • H04B7/0619—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 using feedback from receiving side

Definitions

  • the invention relates to a method for selecting a transmitting antenna in a wireless multi-antenna communication system and a method for transmitting and receiving signals.
  • Wireless communication provides a means for people to connect with each other and obtain information anytime, anywhere, so it has gained rapid popularity in recent years.
  • due to mobile requirements there are certain restrictions on the directional transmission of wireless signals, so that the wireless communications of different users inevitably interfere with each other.
  • the use of wireless spectrum is generally strictly restricted and managed. In this way, wireless communications cannot have as much bandwidth as wired communications. Therefore, based on the limited available wireless spectrum, how can Increasing the information transmission capacity of wireless communication systems is an urgent problem that needs to be solved.
  • the signal-to-interference (noise) ratio of multi-antenna reception is not very high;
  • the multiple channels of wireless reception cannot be kept independent of each other at any time, in each unit time of reception.
  • the present invention provides a method for selecting a transmitting antenna in a multi-antenna communication environment. Using the transmitting antenna selected by the method to perform signal transmission can reduce mutual interference of transmitting signals and improve signal energy transmission efficiency. At the same time, it can also make the reception processing of the signal simpler;
  • the present invention also provides a method for transmitting and receiving signals based on the time division duplex mode using the antenna selection method described above. Using this method can improve the transmission efficiency of high-speed data, and The end obtains the highest possible signal-to-interference (noise) ratio.
  • the method for selecting a transmitting antenna in a multi-antenna communication environment includes the following steps:
  • Multiple antennas are set at the signal transmitting end and the signal receiving end respectively;
  • the signal transmitting end first transmits pilots on all antennas, and the signal receiving end measures the channel estimates of each transmitting antenna of the signal transmitting end obtained on different receiving antennas;
  • the signal receiving end selects one or more antennas from the multiple antennas of the signal transmitting end as the transmitting antennas according to the measured signal-to-noise ratio of the receiving channel. If one is selected, the selection result is notified to the signal transmitting end; otherwise, the signal receiving end The channel space vectors obtained on all receiving antennas are used to calculate the correlation between the space vectors. Based on the correlation, one or more of the multiple antennas at the signal transmitting end are selected as the transmitting antennas, and the selection result is notified to the signal transmitting end. ;
  • the signal transmitting end selects a transmitting antenna according to the selection result of the signal receiving end.
  • the transpose represents the modulus of taking a complex number.
  • the transmitting antenna is selected according to the principle of minimum correlation of the channel space vector and the square and maximum of the modulus of each element of the channel space vector.
  • the signal transmitting end is a base station and the signal receiving end is a mobile station.
  • the mobile station determines the channel conditions of the uplink and downlink multi-antennas at the same time according to the pilot of the base station to directly select the uplink transmitting antenna.
  • a method for transmitting and receiving a signal based on a time division duplex mode by using the foregoing transmitting antenna selection method provided by the present invention includes:
  • Step 1 All antennas of the base station transmit pilot signals within a fixed allocated time period;
  • Step 2 The mobile station measures all received pilot signals on its different receiving antennas, and selects one or more antennas, As an uplink transmitting antenna, since the next uplink transmitting moment, the selected antenna is used as a transmitting antenna to transmit signals in the uplink transmitting time period.
  • Step 3 The mobile station receives all received pilot signals on its different antennas. Selecting one or more antennas of the base station as a transmitting antenna, and notifying the base station to use the antenna selected by the mobile station to transmit a signal to the mobile station in the next downlink transmission;
  • Step 4 The base station uses multiple antennas to receive signals from the mobile station, and according to the mobile station's notification, selects one or more antennas as the downlink transmitting antennas, and sends the signals to the mobile station within the downlink transmitting time period from the next downlink transmission time. transmit a signal.
  • step 1 all antennas of the base station transmit pilot signals in a code division manner within a fixed allocated time period.
  • all antennas of the base station select a code obtained by different cyclic shifting of the same code as a pilot for transmission within a fixed allocated time period.
  • step 1 all antennas of the base station transmit pilot signals in a time-division manner within a fixed allocated time period.
  • the one or more antennas selected in step 1 are all antennas with the greatest received signal strength or the sum of the signal-to-noise ratio.
  • the one or more antennas selected in step 3 are the antennas with the largest received signal strength or the sum of the signal-to-noise ratio of the transmitted signals on all mobile station antennas.
  • Another method for transmitting and receiving signals based on a time division duplex mode using the above-mentioned transmitting antenna selection method provided by the present invention includes:
  • Step 11 The mobile station measures the received signals on different receiving antennas on the local side, selects one of the antennas as an uplink transmitting antenna, and uses the selected antenna as a transmitting antenna at the next uplink transmitting moment, and transmits the signal at the uplink transmitting time. Transmit signal within the segment;
  • Step 12 The base station selects one of the antennas as a downlink transmitting antenna based on the signals of the mobile station received on the multiple antennas on the local side, and transmits a signal to the mobile station within the downlink transmitting time period at the next downlink transmission time.
  • the received signals on the different antennas measured by the mobile station in step 11 are pilot signals transmitted by the base station, broadcast signals transmitted by the base station, or dedicated channel signals transmitted by the base station to the mobile station.
  • One of the antennas selected in steps 11 and 12 is the antenna with the highest received signal strength or signal-to-noise ratio.
  • the base station transmits signals in step 12
  • the multiple antennas on the base station side are selected to transmit the same signal, and the different antennas are weighted to achieve the orientation of the signals. emission.
  • the method of the present invention selects the transmitting antenna of the signal transmitting end through the signal receiving end, so that the signal transmitting end transmits the signal through the selected antenna, so that high-speed data transmission can be implemented more effectively, and the interference of concurrent data streams with each other can be reduced;
  • the premise of the realization of the existing multi-antenna transmitting / receiving method is the spatial direction formed by each transmitting signal on the multi-receiving antenna. The correlation between the quantities is small. Due to the randomness of the charging channel, this condition is not always met. However, when all the channels of the transmitted signals have a large correlation, the channels experienced by some of the signals may still be orthogonal to each other, or the correlation is small.
  • the signal receiving end of the present invention can obtain a more efficient signal transmission by selecting a part of the transmitting antenna according to the measured signal-to-noise ratio of the receiving channel and the correlation between the channel space vectors of the signal. Can make the receiving process of the signal simpler.
  • the achievable signal-to-noise ratio is generally low due to the presence of large interference.
  • high-speed transmission can be performed by selecting a small number of transmitting antennas to avoid interference caused by other transmitting antennas.
  • the probability that the channels have a small correlation with each other is the same. Therefore, the present invention can obtain an effective and reasonable application of multi-antenna transmission by selecting based on the correlation of channel space vectors, which is more conducive to Improved efficiency of wireless cellular communication systems.
  • the signal transmitting and receiving method provided by the present invention can be applied under the condition that multiple signal channels are independent of each other, and also can be used only when the noise signals of different antennas are independent of each other. It can be used in a wider range of practical environments, and can be used in both diversity antennas and smart antennas.
  • the present invention uses the broadcast of a multi-antenna common pilot signal of a base station, so that a mobile station can simultaneously estimate the The channel between multiple antennas is based on this. Therefore, in a time division duplex system, the mobile station can obtain the uplink and downlink channel conditions at the same time, so that the optimal uplink transmitting antenna can be selected according to a certain principle.
  • multiple transmitting antennas while transmitting data in the uplink, notify the base station of the transmission that should be selected next time when transmitting data for the mobile station Antenna, so as to obtain the optimized performance of uplink and downlink multi-antenna transmission and reception at the same time; therefore, using this method can improve the transmission efficiency of high-speed data and obtain the highest signal-to-interference (noise) ratio at the signal receiving end.
  • noise signal-to-interference
  • the antenna single transmission and multiple reception methods are used to transmit and receive wireless signals, since multiple signal channels are not required to be independent of each other, the practical environment can be more extensive, and it can be used in both diversity antennas and smart antennas. .
  • the mutual interference of the transmitted signals is reduced.
  • the receiving and processing tube is single, the highest possible signal-to-interference (noise) ratio can be obtained, but also the signal energy transmission efficiency is higher, so it is more suitable for wireless environments. application.
  • a single antenna is used for transmission, and there is no need to synchronize the signals of multiple transmitting antennas on the receiving antenna, which is easier to implement.
  • FIG. 1 is an example diagram of a multi-antenna time division duplex system to which the present invention is applied;
  • FIG. 2 is a flowchart of an embodiment of a transmitting antenna selection method according to the present invention
  • FIG. 3 is a schematic diagram of uplink and downlink transmission period allocation.
  • the premise of its application is the existence of independent Rayleigh fading channels.
  • the multi-antenna transmitting / receiving environment shown in FIG. 1 the number of transmitting antennas in the figure is 4, and the receiving is 6 antennas.
  • the channel does not change or changes slowly during a processing cycle. Therefore, on the 6 ⁇ receiving antenna, you can get 24 constant or slowly changing channels:
  • 1 ⁇ 2 represents the channel experienced by the transmitted signal of the / th base station antenna to reach the mobile station antenna of the ⁇ th base station
  • i ⁇ 6 , i ⁇ y ⁇ 4 o , and i ⁇ ⁇ 4 are corresponding vector representations.
  • the signals it receives are:
  • Formula (2) shows that the four transmit signals are spatially encoded on the six receiving antennas, and the encoded spatial codes are vectors, 1 ⁇ ' ⁇ 4 . Therefore, the most efficient reception of formula (2) occurs if and only if the above-mentioned spatial codes are orthogonal to each other, or the correlation coefficient is small. When there is a strong correlation between different space codes, the performance of the above-mentioned multi-antenna transmission / reception system will inevitably decrease.
  • one or more antennas are selected for transmission, and then multiple antennas are used for reception at the receiver, so as to obtain as orthogonal as possible in space.
  • Multiple transmission signals can simplify the receiving process and effectively improve the performance of signal transmission.
  • FIG. 2 is a flowchart of an embodiment of the method according to the present invention.
  • the signal transmitting end first transmits pilots on all antennas through step 1.
  • the signal receiving end measures each transmission of the signal transmitting end obtained on different receiving antennas.
  • Antenna channel estimation, and then the signal receiving end in step 2 according to the estimated signal-to-noise ratio measured from the receiving channel select one or more of them as the transmitting antenna from multiple antennas at the transmitting end of the signal, for example, select the transmitting signal at The antenna with the largest sum of signal-to-noise ratios on all mobile station antennas.
  • step 3 it is determined that several antennas are selected in step 2. If one is selected, the signal receiving end notifies the signal transmitting end of the selection result in step 5, and the signal transmitting end selects the transmitting antenna according to the selection result of the signal receiving end. If it is learned through step 3 that more than two antennas are selected, the signal receiving end resides on the channel space vectors obtained on all the receiving antennas in step 4 and calculates the correlation between the space vectors.
  • one or more antennas are selected as the transmitting antennas, and then the signal receiving end informs the signal transmitting end of the selection result in step 5, and the signal transmitting end selects the transmitting antenna according to the selection result of the signal receiving end.
  • the transmitting antenna is selected according to the principle of minimum correlation of the channel space vector and maximum sum of squares of the moduli of the elements of the channel space vector.
  • the receiving end estimates that the channel is as follows:
  • the channel space vector of the signal of the transmitting antenna 1 is completely related to the channel space vector of the signal of the transmitting antenna 3.
  • the signal strength of the transmitting antenna 1 is higher than the signal strength of the antenna 3, and the channel space vector of the signal of the transmitting antenna 4 is any other
  • the channel space vectors of the signals all have a strong correlation. Therefore, selecting the transmitting antennas 1 and 2 to transmit signals respectively can achieve the most effective signal transmission.
  • the method described in FIG. 2 can be applied to a frequency division duplex (FDD) mode and a time division duplex (TDD) mode.
  • FDD frequency division duplex
  • TDD time division duplex
  • a signal transmitting end is a base station and a signal receiving end is mobile.
  • the mobile station can simultaneously determine the channel conditions of the uplink and downlink multi-antennas so as to directly select the uplink transmitting antenna.
  • the selection of the uplink transmitting antenna described here is to select the one or more antennas that have the greatest received signal strength or the sum of the signal-to-noise ratio.
  • the key to the realization of a multi-antenna system is the production of multi-antennas at one end of the mobile station.
  • the difficulty lies in the contradiction between the portability of the device and the multi-antenna channels. Due to the diversity of the actual environment, when the receiving antennas of a mobile station are half the carrier wavelength, There is still a possibility that there is a large correlation between the fading channels, which makes it difficult to set the antenna of the mobile station.
  • noise since the azimuth distribution of the incoming signal of the noise signal is relatively broad, and the noise itself is also a combination of multiple signals, implementing multiple antennas on a mobile station to receive noise independently of each other is better than ensuring the signals on different antennas. It is easier to implement independent channels.
  • the received signals on the two receiving antennas can be expressed by the following expressions:
  • a 2 and A 2 are known (or estimated) flat fading channels, and are unchanged or slowly changed within a short period of signal reception (this is not required here
  • the two channels are independent of each other), and it is assumed that the noises "1 and" ⁇ 2 received by the two antennas are Gaussian noise and the noise power is ⁇ 2 .
  • the noises "1 and" ⁇ 2 received by the two antennas are Gaussian noise and the noise power is ⁇ 2 .
  • the signal-to-noise ratios of the two ⁇ receiving antennas are 1 ⁇ 2 ⁇ , ⁇ 2
  • the same carrier is used for the uplink and the downlink. Therefore, the channel estimates on both sides can be obtained at the same time through single-sided channel measurement.
  • a time division multiple access system Medium means that 6 timeslots long enough need to be allocated, and the number of resources to be allocated increases linearly with the number of users. Therefore, in a general time division duplex wireless communication system, only a method in which a base station broadcasts a pilot signal, that is, a common pilot signal, can be adopted, so that a mobile station can obtain uplink and downlink channel estimates through measurement.
  • a multi-antenna transmitting / receiving system with a selection of transmitting antennas applying the above-mentioned method of unidirectional common pilot signal transmission will cause signal transmission in a certain direction to lack a basis for judgment because it does not have the channel estimation of all antennas. As a result, the performance of the method is partially lost, so the above drawbacks must be avoided in a multi-antenna transmission / reception system.
  • multiple antennas are first set on the base station side and the mobile station side respectively.
  • the multiple antennas are set according to the principle that the noise received by each antenna is independent of each other. Specifically, the following methods can be used to set:
  • the distance between the antennas on the side can be determined according to the sector angle of the service, so that the distance between two adjacent antennas is not less than the load.
  • Half-wavelength x 360 degrees / ⁇ that is, the distance between adjacent antennas is greater than or equal to " ⁇ 2 ⁇ ; it can also be set to half of the carrier wavelength; the distance between adjacent antennas on the side of the mobile station should not be less than the carrier Half the wavelength, that is, the distance between adjacent antennas is greater than or equal to.
  • a time division duplex system separate time slices are arranged in the time period of downlink transmission for all transmitting antennas of the base station to transmit a common pilot.
  • the transmission mode of the pilot signals of different antennas may be code division or time division. If the code division method is adopted, all antennas of the base station may also select codes obtained by different cyclic shifts of the same code as pilots for transmission within a fixed allocated time period. For example, if there is a code sequence [mi m 2 ... 1M ], a pilot sequence can be assigned to the base station antenna 1 [mi... m m mi... m s ], base station antenna 2 assigns pilot sequence
  • the mobile station can measure itself based on the common pilot signal broadcast by the base station.
  • the channels on the respective multi-antennas are used to obtain all channel estimates between the respective mobile station antenna and the base station antenna. Based on this channel estimation, the mobile station determines the uplink transmitting antenna according to some criteria. It can be a transmission
  • the antenna may also be multiple transmitting antennas.
  • the mobile station uses the determined uplink transmitting antennas to transmit data upstream during the uplink transmission time period from the next uplink transmission time.
  • the root antenna is the antenna that selects the maximum received signal strength or the sum of the signal-to-noise ratio.
  • the mobile station also connects according to its own difference. All received pilot signals on the receiving antenna, one or more antennas of the base station are selected as transmitting antennas, and the base station is notified to use the antenna selected by the mobile station to transmit signals to the mobile station during the next downlink transmission.
  • the selected one or more antennas is the antenna that selects the maximum received signal strength or the sum of the signal-to-noise ratio of the transmitted signals on all mobile station antennas.
  • the base station After receiving the notification from the mobile station, the base station starts from the next downlink.
  • the antenna selected by the mobile station is selected to transmit data for the mobile station during the downlink transmission time period, and the public pilot signal is continuously broadcast in a fixed allocated time slice to provide the mobile station for channel estimation at the next time.
  • the method described in the present invention does not exclude the use of a base station smart antenna.
  • the base station's downlink transmission if multiple antennas are completely or strongly correlated, these multiple antennas can also be used.
  • the antenna achieves directional transmission.
  • directional transmission the signals transmitted by multiple antennas are exactly the same, and the channels they experience are also basically the same. The difference is only that the weighting value is different, which results in spatial directional transmission. Therefore, the effect is still equivalent to a single antenna transmission.
  • FIG. 1 is an example diagram of a multi-antenna time division duplex system to which the present invention is applied.
  • the base station has 4 antennas
  • the mobile station has 6 antennas.
  • Figure 3 is a schematic diagram of uplink and downlink transmission period allocation. Referring to FIG. 3, if a time division duplex method is adopted, an uplink transmission period and a downlink transmission period can be divided into one transmission period.
  • the base station transmits a common pilot within a certain fixed time of the downlink transmission period. During this time period, the base station does not transmit other data signals, and different transmitting antennas can use code division to transmit pilots with different code spreading, which is convenient for mobile stations to measure different channels.
  • the 4 antennas of the base station transmit pilot signals of different codes within the common pilot time slice of the downlink transmission period.
  • the six receiving antennas of the mobile station estimate different channels based on these pilot signals. There are 24 channels in total, which are expressed in the form of a matrix:
  • 1 ⁇ 2 represents the channel that the transmitted signal of the / th base station antenna reaches the z'th mobile station antenna. Due to the use of the time division duplex method, during the uplink transmission period in the next transmission period, the channel that the transmission signal of the first mobile station antenna reaches when it reaches the base station antenna is also roughly 1 ⁇ 2. Based on this phenomenon, the mobile station's uplink in the next transmission cycle During the transmission period, the antenna used for uplink transmission can be selected according to the channel estimation result in formula (6). Depending on the channel conditions and the amount of data to be transmitted, a transmit antenna or multiple transmit antennas are selected.
  • the principle for the mobile station to select antennas can be the principle that the sum of the energy received by all transmitting antenna signals on the antenna is the largest.
  • the matrix The sum of the squared amplitudes of the elements of a row, ⁇ ′′ 1 ⁇ 2
  • the mobile station also selects the transmitting antenna that the base station should use for the next transmission according to the channel in formula (6).
  • the selection principle may be the principle that the sum of the received signal energy of the transmitting antenna on all receiving antennas of the mobile station is the largest. That is, the mobile station calculates the sum of the squared amplitudes of the elements of each column in the matrix of formula (6), ⁇ ⁇ ⁇
  • 2 , 1 ⁇ 7' ⁇ 4, assuming that the formula gets the maximum value when / 1, that is, lAnl 2 + l1 ⁇ 2
  • the mobile station can notify the base station to use antenna 1 for transmission during the downlink transmission period.
  • the base station receives signals using 4 antennas at the same time, and obtains from the mobile station which antenna or antennas should be used for the mobile station to transmit signals during the downlink transmission period of the transmission period.
  • high-speed data communication between the base station and the mobile station is finally achieved.
  • the mobile station assuming that the mobile station has learned that there is a strong correlation between the first antenna and the second antenna of the base station, and the directional transmission of the smart antenna can be achieved.
  • the base station learns from the mobile station, it needs to Signaling using one of these two antennas When transmitting, you can also select two antennas to transmit the same signal at the same time, and achieve different directional transmission by different weighting.
  • the invention also provides the following signal transmission and reception method based on the time division duplex mode.
  • a mobile station receives broadcast information from a base station, it can detect the strength of the signals received by multiple receiving antennas.
  • the antenna with the strongest signal detected at the previous moment is used as the transmitting antenna, and during the uplink transmission period
  • the internal transmission uplink signal may be a pilot signal transmitted by the base station, a broadcast signal transmitted by the base station, or a dedicated channel signal transmitted by the base station to the mobile station.
  • the base station may use the antenna with the strongest received signal as the downlink transmission antenna to transmit downlink data to the user during the downlink transmission period.
  • the selected transmitting antenna is the antenna with the highest received signal strength or the highest signal-to-noise ratio (signal-to-interference ratio).
  • the selection of a single transmitting antenna can also be selected according to other principles.
  • the method described in the present invention does not exclude the use of a base station smart antenna.
  • the multiple antennas may also be used for directional transmission.
  • the signals transmitted by multiple antennas are completely the same, and the channels they experience are also basically the same.
  • the difference is only the difference in the weighting value, which results in spatial directional transmission. Therefore, the effect is still equivalent to a single antenna transmission.

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

Abstract

La présente invention se rapporte à des procédés de sélection d'antennes d'émission dans un environnement de communication à antennes multiples. Selon ces procédés, le terminal d'émission du signal émet tout d'abord un signal pilote sur toutes les antennes, le terminal récepteur du signal mesure une estimation de voie qui est reçue par les différentes antennes de réception et provient de toutes les antennes d'émission du terminal d'émission du signal. Le terminal de réception du signal sélectionne ensuite une ou plusieurs antennes en tant qu'antennes d'émission parmi les multiples antennes du terminal d'émission du signal, en fonction de la valeur du rapport signal-bruit mesurée par la voie de réception. Lorsqu'une antenne est sélectionnée, le résultat sélectionné est directement notifié au terminal d'émission du signal. Sinon, le terminal de réception du signal estime une valeur relative entre le vecteur spatial et un autre vecteur, également sur la base du vecteur spatial de voie provenant de toutes les antennes de réception. En fonction de ladite valeur relative, une ou plusieurs antennes sont sélectionnées en tant qu'antennes d'émission parmi les multiples antennes du terminal d'émission du signal, le résultat sélectionné étant alors notifié au terminal d'émission du signal. La présente invention se rapporte également à un procédé d'émission et de réception du signal, qui met en oeuvre les procédures ci-dessus mentionnées selon un mode duplex à répartition dans le temps.
PCT/CN2003/000628 2002-08-05 2003-08-05 Procedes de selection d'antennes d'emission dans un environnement de communication a antennes multiples et procedes d'emission et de reception du signal WO2004013988A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2003255091A AU2003255091A1 (en) 2002-08-05 2003-08-05 A transmitting antenna select methods in multi-antennas communication environment and transmitting and receiving methods of the signal

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
CN 02125818 CN1210969C (zh) 2002-08-05 2002-08-05 无线通信系统中基于时分双工的信号发射和接收方法
CN02125818.X 2002-08-05
CN 02126038 CN1266856C (zh) 2002-08-09 2002-08-09 无线通信系统中基于时分双工的信号发射和接收方法
CN02126038.9 2002-08-09
CN02125481.8 2002-08-12
CN 02125481 CN1214673C (zh) 2002-08-12 2002-08-12 多天线通信环境中发射天线的选择方法

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WO2004013988A1 true WO2004013988A1 (fr) 2004-02-12

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7945881B2 (en) 2007-12-20 2011-05-17 International Business Machines Corporation Method of reducing crosstalk induced noise in circuitry designs
WO2022028325A1 (fr) * 2020-08-07 2022-02-10 华为技术有限公司 Procédé de communication et appareil de communication
CN114070372A (zh) * 2020-08-07 2022-02-18 华为技术有限公司 通信方法与通信装置

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