WO2011157147A2

WO2011157147A2 - Method, device and system for transmitting signals

Info

Publication number: WO2011157147A2
Application number: PCT/CN2011/075058
Authority: WO
Inventors: 杨坚锐; 黄晖; 常欣; 张志东; 阮卫
Original assignee: 华为技术有限公司
Priority date: 2011-05-31
Filing date: 2011-05-31
Publication date: 2011-12-22
Also published as: WO2011157147A3; CN102217210A

Abstract

The present invention provides a method, device and system for transmitting signals and relates to the field of wireless communication. The method includes: correcting at least two antennas; adjusting the phase difference between each two antennas in the at least two antennas to be 90 degrees, or dividing the at least two antennas into two groups, adjusting the phase difference between each antenna in the same group to be 0 degree and adjusting the phase difference between each two antennas in different groups to be 90 degrees; transmitting the signals to be transmitted via the antennas the phase differences between which are adjusted to be 90 degrees. The present invention is mainly used to transmit and receive information between a base station and a mobile station, and solves the problem that the polarizations of the signals are eliminated each other and eliminates the defect of the cyclic delay diversity (CDD) technology.

Description

Signal transmitting method, device and system

TECHNICAL FIELD The present invention relates to the field of wireless communications, and in particular, to a signal transmission method, apparatus, and system. Background technique

In the prior art, when CDD (Cyclic Delay Diversity) is used for diversity transmission, the performance gain brought by such CDD technology is unstable, and in some channel environments, performance degradation is caused. The channel equivalent between the BS (base station) and the MS (mobile station) in the CDD system is the superposition of the channel between each transmitting antenna and the receiving antenna of the BS multiplied by a different phase shift, and the result of this superposition will cause the channel to Fluctuations in the frequency domain have increased. For example, when the channel is a single-path channel, it appears as a frequency-domain fading. After the dual-antenna CDD system is transmitted, the equivalent channel is a frequency-domain fading channel, and the number of deep fading points in the frequency domain is the same as the number of cyclic delay points. The power gain brought by the dual antenna transmission cannot compensate for the deterioration of the demodulation performance in the frequency domain deep fading. As the number of transmitting antennas increases, the cyclic delay difference between the antennas of the CDD system increases, the channel fluctuates more drastically in the frequency domain, and the demodulation performance deteriorates more severely.

Another method for transmitting signals in the prior art is as follows: The base station uses a cross-polarized antenna, and the same antenna array includes two cross-polarized antennas, and the two antennas transmit the same signal to obtain polarization diversity.

When the initial phase difference of the base station +/- 45 degree cross-polarized antenna is 0, the polarization is enhanced in the vertical polarization direction of the terminal, the polarization is cancelled in the horizontal direction, and the received signal strengths of the terminal antenna horizontally placed and vertically placed are different. More than 10dB. It can be seen that 发送 using this method to transmit signals, when the terminal uses a single-polarized antenna, and the polarization leakage is not obvious, it may cause polarization cancellation of the signal on the terminal side. Summary of the invention

Embodiments of the present invention provide a signal transmission method, apparatus, and system, which solve the problem of signal polarization cancellation and eliminate the defects of the CDD technology. In order to achieve the above object, an embodiment of the present invention uses the following technical solution: A method for transmitting a signal, comprising: correcting at least two antennas; Adjusting a phase difference between each of the at least two antennas to 90 degrees, or dividing the at least two antennas into two groups, and adjusting phase differences between the antennas in the same group At 0 degrees, the phase difference between each two antennas in different groups is adjusted to 90 degrees; the signal to be transmitted is transmitted through the antenna whose phase difference is adjusted to 90 degrees. A transmitting device for a signal, comprising: a correcting unit, configured to correct at least two antennas; and an adjusting unit, configured to adjust a phase difference between each of the at least two antennas to 90 degrees, or The adjusting unit is configured to divide the at least two antennas into two groups, and adjust a phase difference between each antennas in the same group to 0 degrees, and a phase difference between each two antennas of different groups Adjusted to 90 degrees; a transmitting unit, configured to transmit an antenna to be transmitted through the antenna with the phase difference adjusted to 90 degrees. A signal transmission system, comprising: a base station, configured to correct at least two antennas, adjust a phase difference between each of the at least two antennas to 90 degrees, or the at least two The antennas are divided into two groups, the phase difference between the antennas in the same group is adjusted to 0 degrees, the phase difference between each two antennas in different groups is adjusted to 90 degrees, and the signal to be transmitted is passed through The antenna whose phase difference is adjusted to 90 degrees is transmitted. And a mobile terminal, configured to receive, by the base station, a signal that is transmitted by an antenna with a phase difference of 90 degrees.上述 With the above technical solution, when the signal is transmitted, the antenna is corrected so that the phase difference between each two antennas is adjusted to 90 degrees, or the phase difference between each two antennas of different groups is adjusted to 90 degrees. Compared with the prior art, the terminal uses a single-polarized antenna, and the polarization leakage is not obvious, which may cause the polarization of the signal on the terminal side to be cancelled. The technical solution provided by the embodiment of the present invention solves the polarization phase. The problem of the CDD technology is eliminated from the existing CDD technology, in which the signal cyclic phase shift superimposition causes the channel to be intensified in the frequency domain. DRAWINGS

1 is a flowchart of a method for transmitting a signal according to Embodiment 1 of the present invention; 2 is a structural diagram of a signal transmitting apparatus according to Embodiment 2 of the present invention; FIG. 3 is a structural diagram of a signal transmitting system according to Embodiment 3 of the present invention;

4 is a flowchart of a method for transmitting a signal according to Embodiment 4 of the present invention; FIG. 5 is a schematic diagram of a method for transmitting a signal according to Embodiment 4 of the present invention;

6 is a flowchart of a method for transmitting a signal according to Embodiment 5 of the present invention;

7 is a schematic diagram of a method for transmitting a signal according to Embodiment 5 of the present invention;

8 is a structural diagram of a signal transmitting apparatus according to Embodiment 6 of the present invention; and FIG. 9 is a structural diagram of a signal transmitting apparatus according to Embodiment 7 of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a method, an apparatus, and a system for transmitting a signal according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. Embodiment 1 A method for transmitting a signal according to an embodiment of the present invention, as shown in FIG. 1, includes:

101. Correcting at least two antennas;

102. Adjust a phase difference between each of the at least two antennas to 90 degrees, or divide the at least two antennas into two groups, and phase the antennas located in the same group. The difference is adjusted to 0 degrees, and the phase difference between each two antennas in different groups is adjusted to 90 degrees;

103. The signal to be transmitted is transmitted through an antenna whose phase difference is adjusted to 90 degrees. Specifically, the above method can be performed by a base station. Using the signal transmission method provided in this embodiment, when the signal is transmitted, the antenna is corrected so that the phase difference between each two antennas is adjusted to 90 degrees, or the phase difference between each two antennas of different groups. Adjust to 90 degrees. Compared with the prior art, the terminal uses a single-polarized antenna, and the polarization leakage is not obvious, which may cause the polarization of the signal on the terminal side to be cancelled. The technical solution provided by the embodiment of the present invention solves the polarization phase. The problem with the elimination; compared with the existing CDD technology, there is a defect that the signal cyclic phase shift is superimposed so that the channel is intensified in the frequency domain. The example excludes the drawbacks of CDD technology. Embodiment 2 A transmitting device for a signal provided by an embodiment of the present invention, as shown in FIG. 2, includes: a correcting unit 201, an adjusting unit 202, and a transmitting unit 203. The correcting unit 201 is configured to correct at least two antennas; the adjusting unit 202 is configured to adjust a phase difference between each of the at least two antennas to 90 degrees, or the adjusting unit is used to Dividing the at least two antennas into two groups, adjusting a phase difference between each antenna in the same group to 0 degrees, and adjusting a phase difference between each two antennas in different groups to 90 degrees; 203. The antenna for transmitting a signal to be transmitted is adjusted to be 90 degrees by the phase difference. The transmitting device of the signal may specifically be a base station. The transmitting device using the signal provided in this embodiment corrects the antenna when the signal is transmitted, so that the phase difference between each two antennas is adjusted to 90 degrees, or the phase difference between each two antennas of different groups Adjust to 90 degrees. Compared with the prior art, the terminal uses a single-polarized antenna, and the polarization leakage is not obvious, which may cause the polarization of the signal on the terminal side to be cancelled. The technical solution provided by the embodiment of the present invention solves the polarization phase. The problem of the CDD technology is eliminated from the existing CDD technology, in which the signal cyclic phase shift superimposition causes the channel to be intensified in the frequency domain. The transmitting system of the signal provided by the embodiment of the present invention, as shown in FIG. 3, includes: a base station 301 and a mobile terminal 302. a base station, configured to correct at least two antennas, adjust a phase difference between each of the at least two antennas to 90 degrees, or divide the at least two antennas into two groups, which will be located The phase difference between the antennas in the same group is adjusted to 0 degrees, the phase difference between each two antennas of different groups is adjusted to 90 degrees, and the signal to be transmitted is adjusted to 90 degrees by the phase difference. Launch. And a mobile terminal, configured to receive, by the base station, a signal that is transmitted by an antenna with a phase difference of 90 degrees. The transmitting system using the signal provided in this embodiment corrects the antenna when the signal is transmitted, so that the phase difference between each two antennas is adjusted to 90 degrees, or the phase difference between each two antennas of different groups Adjust to 90 degrees. Compared with the prior art, the terminal uses a single-polarized antenna, and the polarization leakage is not obvious, which may cause the polarization of the signal on the terminal side to be cancelled. The technical solution provided by the embodiment of the present invention solves the polarization phase. The problem of the CDD technology is eliminated from the existing CDD technology, in which the signal cyclic phase shift superimposition causes the channel to be intensified in the frequency domain. Embodiment 4 A method for transmitting a signal according to an embodiment of the present invention, as shown in FIG. 4, includes:

401. The signal source provides a signal to be transmitted.

402. Perform channel coding on the to-be-transmitted signal.

403. Map a signal to be transmitted.

404. Perform OFDM (Orthogonal Frequency Division Multiplexing) modulation on the signal to be transmitted.

405. Add a CP (cyclic prefix) to the signal to be transmitted;

406: Perform correction on at least two antennas; 407, adjust a phase difference between each of the at least two antennas to 90 degrees; specifically, when the base station uses a cross-polarized antenna, in FIG. The phase difference between the antenna 1 and the antenna 2 is 90 degrees.

408. Transmit the signal to be transmitted by using the antenna whose phase difference is adjusted to 90 degrees. Specifically, signals are transmitted through the two antennas of the cross-polarized antenna described above. Using the signal transmission method provided in this embodiment, when the signal is transmitted, the antenna is corrected so that the phase difference between each two antennas is adjusted to 90 degrees, or the phase difference between each two antennas of different groups. Adjust to 90 degrees. Compared with the prior art, the terminal uses a single-polarized antenna, and the polarization leakage is not obvious, which may cause the polarization of the signal on the terminal side to be cancelled. The technical solution provided by the embodiment of the present invention solves the polarization phase. Problem with the existing CDD technology, Embodiments of the present invention preclude the deficiencies of the CDD technique in that there is a defect that the signal cyclic phase shift superposition makes the channel intensified in the frequency domain. Embodiment 5 A method for transmitting a signal according to an embodiment of the present invention, as shown in FIG. 6, includes:

601. The signal source provides a signal to be transmitted.

602. Perform channel coding on the to-be-transmitted signal.

603. Perform a MIM0 (multiple-in-one-out) encoding on the to-be-transmitted signal;

604. Map the signal to be transmitted.

605. Perform OFDM modulation on the to-be-transmitted signal.

606. Add a signal to the to-be-transmitted signal;

607. Correct the at least two antennas.

608. The at least two antennas are divided into two groups, and a phase difference between each antenna in the same group is adjusted to 0 degrees, and a phase difference between each two antennas in different groups is adjusted to 90 degrees. And transmitting the signal to be transmitted through the antenna whose phase difference is adjusted to 90 degrees. Specifically, when the signal is transmitted by the grouped antenna, the antenna A1, the antenna A2~the antenna An are a group, the antenna B1, the antenna B2, the antenna Bn are a group, and the antenna A1, the antenna A2~the antenna An are mutually connected. The phase difference is 0 degrees, and the phase difference between the antenna B1 and the antenna Β2 ··· antenna Bn is 0 degrees; the phase difference between the antenna A1 and the antenna B1 is 90 degrees, and the phase difference between the antenna A2 and the antenna B2 is 90 degrees. Degree, the phase difference between the antenna An and the antenna Bn is 90 degrees.

609. Transmit the signal to be transmitted by using the antenna whose phase difference is adjusted to 90 degrees. Specifically, as shown in FIG. 7, the phase difference between the antenna A1 and the antenna B1 is 90 degrees, and the antenna A1 and the antenna B1 transmit the same signal S1; the phase difference between the antenna A2 and the antenna B2 is 90 degrees, and the antenna A2 and The antenna B2 transmits the same signal S 2 ; and so on, the phase difference between the antenna An and the antenna Bn is 90 degrees, and the antenna An and the antenna Bn transmit the same signal Sn. Using the signal transmission method provided in this embodiment, when the signal is transmitted, the antenna is corrected so that the phase difference between each two antennas is adjusted to 90 degrees, or the phase difference between each two antennas of different groups. Adjust to 90 degrees. Compared with the prior art, the terminal uses a single-polarized antenna, and the polarization leakage is not obvious, which may cause the polarization of the signal on the terminal side to be cancelled. The technical solution provided by the embodiment of the present invention solves the polarization phase. The problem of the CDD technology is eliminated from the existing CDD technology, in which the signal cyclic phase shift superimposition causes the channel to be intensified in the frequency domain. Example 6

The transmitting device of the signal provided by the embodiment of the present invention, as shown in FIG. 8, includes: a signal source unit 801, a coding unit 802, a mapping unit 803, a modulating unit 804, a CP unit 805, a correcting unit 806, an adjusting unit 807, and a transmitting unit. 808. The signal source unit 801 is configured to provide a signal to be transmitted, the coding unit 802 is configured to perform channel coding on the signal to be transmitted, the mapping unit 803 is configured to map the signal to be transmitted, and the modulation unit 804 is configured to perform the signal to be transmitted. OFDM modulation; a CP unit 805 for adding a CP to be transmitted; a correction unit 806 for correcting at least two antennas; and an adjustment unit 807 for using each of the at least two antennas The phase difference between the two is adjusted to 90 degrees; the transmitting unit 808 is configured to transmit the antenna to be transmitted through the phase difference to 90 degrees. The transmitting device using the signal provided in this embodiment corrects the antenna when the signal is transmitted, so that the phase difference between each two antennas is adjusted to 90 degrees, or the phase difference between each two antennas of different groups Adjust to 90 degrees. Compared with the prior art, the terminal uses a single-polarized antenna, and the polarization leakage is not obvious, which may cause the polarization of the signal on the terminal side to be cancelled. The technical solution provided by the embodiment of the present invention solves the polarization phase. Problem with the existing CDD technology, Embodiments of the present invention eliminate the drawbacks of the CDD technique in that there is a signal cyclic shift superposition such that the channel in the frequency domain fluctuates to aggravate the defect. The transmitting device of the signal provided by the embodiment of the present invention, as shown in FIG. 9, includes: a signal source unit 901, a coding unit 902, a MIM0 unit 903, a mapping unit 904, a modulation unit 905, a CP unit 906, and a correction unit 907. The adjusting unit 908 and the transmitting unit 909. The signal source unit 901 is configured to provide a signal to be transmitted, and the encoding unit 902 is configured to perform channel coding on the signal to be transmitted.

The MIM0 coding unit 903 is configured to perform multi-input and multi-output MIM0 coding on the to-be-transmitted signal; the mapping unit 904 is configured to map the to-be-transmitted signal; the modulation unit 905 is configured to perform OFDM modulation on the to-be-transmitted signal; For adjusting the signal to be transmitted to the CP; a correction unit 907 for correcting at least two antennas; and an adjustment unit 908 for dividing the at least two antennas into two groups, The phase difference between the antennas located in the same group is adjusted to 0 degrees, and the phase difference between each two antennas of different groups is adjusted to 90 degrees; for each of the at least two antennas The phase difference between the two is adjusted to 90 degrees, or the transmitting unit 909 transmits an antenna for adjusting the signal to be transmitted through the phase difference to 90 degrees. The transmitting device using the signal provided in this embodiment corrects the antenna when the signal is transmitted, so that the phase difference between each two antennas is adjusted to 90 degrees, or the phase difference between each two antennas of different groups Adjust to 90 degrees. Compared with the prior art, the terminal uses a single-polarized antenna, and the polarization leakage is not obvious, which may cause the polarization of the signal on the terminal side to be cancelled. The technical solution provided by the embodiment of the present invention solves the polarization phase. Problem with the existing CDD technology, Embodiments of the present invention eliminate the drawbacks of the CDD technique in that there is a signal cyclic shift superposition such that the channel in the frequency domain fluctuates to aggravate the defect. The embodiments of the present invention are mainly applied to transmitting and receiving information between a base station and a mobile station, which solves the problem of signal polarization cancellation and eliminates defects of the CDD technology.

The above is only the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or substitutions within the technical scope of the present invention. It should be covered by the scope of the present invention. Therefore, the scope of the invention should be determined by the scope of the claims.

Claims

Claim

A method for transmitting a signal, comprising: correcting at least two antennas; adjusting a phase difference between each of the at least two antennas to 90 degrees, or The at least two antennas are divided into two groups, and the phase difference between the antennas located in the same group is adjusted to 0. The phase difference between each two antennas of different groups is adjusted to 90 degrees, and the signal to be transmitted is passed through the phase. An antenna adjusted to a difference of 90 degrees is transmitted.

2. The method for transmitting a signal according to claim 1, wherein before the dividing the two antennas into two groups, the method further comprises: performing multi-input and multi-output MIM0 encoding on the to-be-transmitted signal.

A transmitting device for a signal, comprising: a correcting unit, configured to correct at least two antennas; and an adjusting unit, configured to adjust a phase difference between each of the at least two antennas Adjusted to 90 degrees, or the adjustment unit is configured to divide the at least two antennas into two groups, and adjust the phase difference between the antennas in the same group to 0 degrees, located in each of the different groups. The phase difference between the antennas is adjusted to 90 degrees; and a transmitting unit is configured to transmit the signal to be transmitted through the antenna whose phase difference is adjusted to 90 degrees.

The transmitting device of the signal according to claim 3, further comprising: a MIM0 encoding unit, configured to perform multi-input and multi-output MIM0 encoding on the signal to be transmitted.

A transmitting system for a signal, comprising: a base station, configured to correct at least two antennas, and adjust a phase difference between each of the at least two antennas to 90 degrees, or And dividing the at least two antennas into two groups, and adjusting a phase difference between the antennas located in the same group to 0 degrees, located in each group of different groups The phase difference between the two antennas is adjusted to 90 degrees, and the signal to be transmitted is transmitted through the antenna whose phase difference is adjusted to 90 degrees. And a mobile terminal, configured to receive, by the base station, a signal that is transmitted by an antenna with a phase difference of 90 degrees.

The transmitting system of the signal according to claim 5, wherein the base station is further configured to: perform multi-input and multi-output MIM0 on the to-be-transmitted signal before dividing the at least two antennas into two groups. coding.