CN105577256A - A signal transmission method and device - Google Patents

Abstract

The invention provides a signal emission method. Each sub carrier of 8 physical antennas is multiplied by a weighting factor of a specific phase, and the phases of weighting factors of any one antenna in the physical antennas 0, 1, 2, 3 and any one antenna in the physical antennas 4, 5, 6, 7 have one more Pi, and then signals are emitted. The signal emission method does not cause loss of the transmission power of a base station, and the sub carrier power fluctuation amplitude is relatively small, especially when one antenna has failures, the performance loss is not too large.

Description

A signal transmission method and device

technical field

The present invention relates to the communication field, in particular to a signal transmission method in the communication field.

Background technique

With the increasingly higher requirements for the throughput and coverage performance of wireless communication systems, multiple-input multiple-output (Multi-input Multi-output, referred to as "MIMO") technology and orthogonal frequency division multiplexing (Orthogonal frequency division multiple, referred to as " The combination of OFDM") technologies has become a hotspot, such as the Long Term Evolution (Long Term Evolution, referred to as "LTE") system. In the application of MIMO technology, the number of logical data channels and physical data channels may not be equivalent, and a corresponding relationship between the two needs to be established, that is, logical data channels (or logical ports) are mapped to physical data channels (or physical antenna ports). The current commercial LTE system usually uses the transmission mode of 2 logical ports (hereinafter referred to as 2Port). When the base station uses 8 physical antenna ports to transmit signals, it is necessary to implement 4 physical antenna ports (hereinafter referred to as antenna) to 1 logical port. The port mapping is as shown in FIG. 1 . FIG. 1 shows a signal transmission method and implementation structure of 8 antennas 2 ports in an existing LTE system.

In the prior art, when 8 antennas are used to transmit signals, wide beams or a cyclic delay diversity (Cyclic Delay Diversity, "CDD" for short) implementation manner is generally adopted. The implementation of the wide beam is to multiply each subcarrier of each physical antenna by a weighting factor with the same phase before transmitting the signal. In order to achieve the weighted beam shape that meets the coverage requirements of the cell, some physical antennas correspond to the transmission The channel must be transmitted with reduced power, resulting in a loss of base station transmission power; the CDD implementation method is to multiply each subcarrier of each physical antenna by a weighting factor with a different phase before transmitting the signal. The performance gain brought by this implementation method may not be sufficient Make up for the performance loss caused by the fluctuation of the subcarrier signal.

Contents of the invention

In order to solve the technical problems brought about by the above two existing technologies, in the first aspect, the present invention provides a signal transmission method, the method is applied to a communication system including 2 logical ports and 8 physical antennas, the The two logical ports are logical ports 0 and 1, and the eight physical antennas are physical antennas 0, 1, 2, 3 and physical antennas 4, 5, 6, and 7; including:

Weighting the signals of the logical port 0 and the logical port 1 and mapping them to physical antennas 0, 1, 2, 3 and physical antennas 4, 5, 6, 7, and transmitting the signals;

The magnitude of the weighting factor of each physical antenna is 1;

The phases of the weighting factors of each physical antenna are: physical antennas 0 and 4 are 0, physical antennas 1 and 5 are Δ1*k, physical antennas 2 and 6 are Δ2*k, physical antennas 3 and 7 are (Δ1+Δ2) *k, and on this basis, the phase of any one of the physical antennas 0, 1, 2, and 3 and any of the physical antennas 4, 5, 6, and 7 is one more π, where Δ1 and Δ2 are The phase difference between adjacent subcarriers, k is the subcarrier number.

In a first possible implementation manner, in combination with the first aspect, the phases of the weighting factors of the physical antennas further include: respectively increasing the phases of the weighting factors of the physical antennas 1, 2, and 3 by α1, β1, α1 and The sum of β1; where α1 and β1 are arbitrary angle values.

In the second possible implementation manner, in combination with the first aspect or the first possible implementation manner of the first aspect, the phases of the weighting factors of the physical antennas further include: combining the weighting factors of the physical antennas 5, 6, and 7 The phases of the factors are respectively increased by α2, β2, and the sum of α2 and β2; where α2 and β2 are arbitrary angle values.

In a third possible implementation manner, in combination with the first aspect, the first possible implementation manner of the first aspect, or the second possible implementation manner of the first aspect, the phases of the weighting factors of the physical antennas are further Including: increasing the phases of the weighting factors of each physical antenna at the same time in is any angle value.

In a second aspect, the present invention provides a signal transmitting device located in a communication system including 2 logical ports and 8 physical antennas, the 2 logical ports are logical ports 0 and 1, and the 8 physical antennas are Physical Antenna 0, 1, 2, 3 and Physical Antenna 4, 5, 6, 7, also includes:

A processing module, after weighting the signals of the logical port 0 and the logical port 1, and mapping them to physical antennas 0, 1, 2, 3 and physical antennas 4, 5, 6, 7;

a transmitting module, configured to transmit the signal;

The magnitude of the weighting factor of each physical antenna is 1;

The phases of the weighting factors of each physical antenna are: physical antennas 0 and 4 are 0, physical antennas 1 and 5 are Δ1*k, physical antennas 2 and 6 are Δ2*k, physical antennas 3 and 7 are (Δ1+Δ2) *k, and on this basis, the phase of any one of the physical antennas 0, 1, 2, and 3 and any of the physical antennas 4, 5, 6, and 7 is one more π, where Δ1 and Δ2 are The phase difference between adjacent subcarriers, k is the subcarrier number.

In the first possible implementation manner, in combination with the second aspect, the phases of the weighting factors of the physical antennas further include: increasing the phases of the weighting factors of the physical antennas 1, 2, and 3 by α1, β1, α1 and The sum of β1; where α1 and β1 are arbitrary angle values.

In the second possible implementation manner, in combination with the second aspect or the first possible implementation manner of the second aspect, the phases of the weighting factors of the physical antennas further include: combining the weighting factors of the physical antennas 5, 6, and 7 The phases of the factors are respectively increased by α2, β2, and the sum of α2 and β2; where α2 and β2 are arbitrary angle values.

In a third possible implementation manner, in combination with the second aspect, the first possible implementation manner of the second aspect, or the second possible implementation manner of the second aspect, the phases of the weighting factors of the physical antennas are further Including: increasing the phases of the weighting factors of each physical antenna at the same time in is any angle value.

The present invention multiplies each subcarrier of 8 physical antennas by a specific phase weighting factor, and any one of physical antennas 0, 1, 2, 3 and any one of physical antennas 4, 5, 6, 7 The phase of the weighting factor of the antenna is one more π, and then the signal is transmitted. This signal transmission method will not cause the loss of the transmission power of the base station, and the fluctuation range of the subcarrier power is relatively small, especially when one antenna fails, the performance loss will not be large. too big.

Description of drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the accompanying drawings required in the embodiments of the present invention. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For Those of ordinary skill in the art can also obtain other drawings based on these drawings without making creative efforts.

Fig. 1 is a kind of signal transmitting method and realization structure of 8 antenna 2port in the existing LTE system;

Fig. 2 is another kind of signal transmission method and realization structure of 8 antennas 2port in the existing LTE system;

FIG. 3 is a schematic structural diagram of a signal transmitting device provided by an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of another signal transmitting device provided by an embodiment of the present invention.

detailed description

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

Embodiment one

This embodiment provides a signal transmission method, and the method is applied to a communication system including 2 logical ports and 8 physical antennas, the 2 logical ports are logical ports 0 and 1, and the 8 physical antennas are physical antennas 0, 1, 2, 3 and physical antennas 4, 5, 6, 7;

The antennas referred to in the present invention all refer to physical antennas, and the 8 physical antennas can be co-polarized antennas or cross-polarized antennas. In this embodiment, 4 columns are corrected to the array elements, equally spaced, and each column is positive 45 degrees Take a negative 45-degree cross-polarized physical antenna as an example for illustration.

Fig. 2 is a kind of realization structure that this signal transmission method adopts, as shown in Fig. 2, through precoding (Precoding) two Port signals, after weighting processing, map to 8 physical antennas respectively, the mapping method can To map the signal of logical port 0 to physical antenna 0, 1, 2, 3, and to map the signal of logical port 1 to physical antenna 4, 5, 6, 7; it is also possible to map the signal of logical port 0 to physical antenna Antennas 4, 5, 6, 7, and map the signal of logical port 1 to physical antennas 0, 1, 2, 3.

The magnitude of the weighting factor of each physical antenna is 1;

The phases of the weighting factors of physical antennas 0, 1, 2, and 3 are: 0, Δ1*k, Δ2*k, (Δ1+Δ2)*k; the phases of the weighting factors of physical antennas 4, 5, 6, and 7 are respectively It is: 0, Δ3*k, Δ4*k, (Δ3+Δ4)*k, and on this basis, any antenna in physical antenna 0, 1, 2, 3 and physical antenna 4, 5, 6, 7 The phase of the weighting factor of any antenna increases by π, Δ1, Δ2, Δ3, and Δ4 are the phase differences between adjacent subcarriers of physical antennas 1, 2, 5, and 6, respectively, and k is the subcarrier number.

When Δ1=Δ3, Δ2=Δ4, the phases of the weighting factors of each physical antenna are: physical antennas 0 and 4 are 0, physical antennas 1 and 5 are Δ1*k, physical antennas 2 and 6 are Δ2*k, physical antennas 3 and 7 are (Δ1+Δ2)*k, and on this basis, the phase of the weighting factor of any one of the physical antennas 0, 1, 2, and 3 and any of the physical antennas 4, 5, 6, and 7 Increase pi.

After performing weighted mapping on the two Port signals according to the above method, the signals are transmitted through each physical antenna.

Optionally, increase the phase of the weighting factor of physical antenna 1 by α1, increase the phase of the weighting factor of physical antenna 2 by β1, and increase the phase of the weighting factor of physical antenna 3 by the sum of α1 and β1; where α1 and β1 is an arbitrary angle value, for example, 0 degrees to 2π.

It is also possible to increase the phase of the weighting factor of the physical antenna 5 by α2, the phase of the weighting factor of the physical antenna 6 by β2, and the phase of the weighting factor of the physical antenna 7 by α2 and The sum of β2; where α2 and β2 are arbitrary angle values, such as 0 degrees to 2π. That is, the phases of the weighting factors of each physical antenna are: physical antennas 0 and 4 are 0, physical antennas 1 and 5 are Δ1*k+α1, Δ1*k+α2, and physical antennas 2 and 6 are Δ2*k+ β1, Δ2*k+β2, physical antenna 3, 7 are (Δ1+Δ2)*k+α1+β1, (Δ1+Δ2)*k+α2+β2, and on this basis, the physical antenna 0, 1 , any one of the antennas in 2 and 3 and the phase of the weighting factor of any one of the physical antennas 4, 5, 6 and 7 increases by π.

Optionally, when α1=α2=α, β1=β2=β, it is equivalent to increasing the phases of the weighting factors of physical antennas 1 and 5 by α, and increasing the phases of the weighting factors of physical antennas 2 and 6 by β , the phases of the weighting factors of the physical antennas 3 and 7 are added to the sum of α and β; where α and β are arbitrary angle values. That is, the phases of the weighting factors of each physical antenna are: physical antennas 0 and 4 are 0, physical antennas 1 and 5 are Δ1*k+α, physical antennas 2 and 6 are Δ2*k+β, and physical antennas 3 and 7 are (Δ1+Δ2)*k+α+β, and on this basis, the phase of the weighting factor of any one of the physical antennas 0, 1, 2, and 3 and any of the physical antennas 4, 5, 6, and 7 Increase pi.

At this time, the weighted signal of the logical port 0 is mapped to the physical antennas 0, 1, 2, and 3, which can be expressed as the following formula:

W ₀ ＝[w ₀₀ w ₀₁ w ₀₂ w ₀₃ ]

＝[1e ^-j[Δ1k+α] e ^-j[Δ2k+β] e ^{-j[(Δ1+Δ2)k+α+β+π]} ]

Where W ₀ represents the weighting of each subcarrier of the signal of logical port 0; w ₀₀ , w ₀₁ , w ₀₂ , and w ₀₃ represent physical antennas 0, 1, 2, and 3, respectively.

After the weighted signal of the logical port 1 is mapped to the physical antennas 4, 5, 6, 7, it can be expressed as the following formula:

W ₁ =[w ₁₀ w ₁₁ w ₁₂ w ₁₃ ]

=[1e ^-j[Δ1k+α ]e ^{-j[Δ2k+β+π]} e ^{-j[(Δ1+Δ2)k+α+β]} ]

Where W ₁ represents the weight of each subcarrier of the signal of logical port 1; w ₁₀ , w ₁₁ , w ₁₂ , and w ₁₃ represent physical antennas 4, 5, 6, and 7, respectively.

In the above two formulas, Δ1=Δ3, Δ2=Δ4, α1=α2=α, β1=β2=β, and the phases of the weighting factors of antenna 3 and antenna 6 are increased by π respectively.

Optionally, on the basis of the above scheme, the phases of the weighting factors of each physical antenna can also be increased at the same time in is an arbitrary angle value, such as 0 degrees to 2π. Taking α1=α2=α, β1=β2=β as an example, that is, the phases of the weighting factors of each physical antenna are respectively: physical antenna 0 and 4 are Physical antennas 1 and 5 are Physical antennas 2 and 6 are Physical antennas 3 and 7 are And on this basis, the phase of the weighting factor of any one of the physical antennas 0, 1, 2, and 3 and any one of the physical antennas 4, 5, 6, and 7 is increased by π.

This signal transmission method makes full use of the transmission power of each physical antenna, does not cause the loss of base station transmission power, and the fluctuation range of subcarrier power is relatively small, especially when one antenna fails, the performance loss will not be too large.

Embodiment two

This embodiment provides a signal transmitting device, which is connected to the communication system or located in the communication system, the communication system includes 2 logical ports and 8 physical antennas, the 2 logical ports are logical ports 0 and 1, The eight physical antennas are physical antennas 0, 1, 2, and 3 and physical antennas 4, 5, 6, and 7;

The antennas referred to in the present invention all refer to physical antennas, and the 8 physical antennas can be co-polarized antennas or cross-polarized antennas. In this embodiment, 4 columns are corrected to the array elements, equally spaced, and each column is positive 45 degrees Take a negative 45-degree cross-polarized physical antenna as an example for illustration.

Fig. 3 is a schematic structural diagram of the signal transmitting device, in which logical ports and physical antennas are omitted, as shown in Fig. 3, the signal transmitting device includes:

The processing module 31 is configured to weight the signals of the logical port 0 and the logical port 1 and map them to physical antennas 0, 1, 2, 3 and physical antennas 4, 5, 6, 7;

A transmitting module 32, configured to transmit the signal;

The magnitude of the weighting factor of each physical antenna is 1;

The phases of the weighting factors of physical antennas 0, 1, 2, and 3 are: 0, Δ1*k, Δ2*k, (Δ1+Δ2)*k; the phases of the weighting factors of physical antennas 4, 5, 6, and 7 are respectively It is: 0, Δ3*k, Δ4*k, (Δ3+Δ4)*k, and on this basis, any antenna in physical antenna 0, 1, 2, 3 and physical antenna 4, 5, 6, 7 The phase of the weighting factor of any antenna increases by π, Δ1, Δ2, Δ3, and Δ4 are the phase differences between adjacent subcarriers of physical antennas 1, 2, 5, and 6, respectively, and k is the subcarrier number.

When Δ1=Δ3, Δ2=Δ4, the phases of the weighting factors of each physical antenna are: physical antennas 0 and 4 are 0, physical antennas 1 and 5 are Δ1*k, physical antennas 2 and 6 are Δ2*k, physical antennas 3 and 7 are (Δ1+Δ2)*k, and on this basis, the phase of the weighting factor of any one of the physical antennas 0, 1, 2, and 3 and any of the physical antennas 4, 5, 6, and 7 Increase pi.

Optionally, increase the phase of the weighting factor of physical antenna 1 by α1, increase the phase of the weighting factor of physical antenna 2 by β1, and increase the phase of the weighting factor of physical antenna 3 by the sum of α1 and β1; where α1 and β1 is an arbitrary angle value, for example, 0 degrees to 2π.

It is also possible to increase the phase of the weighting factor of the physical antenna 5 by α2, the phase of the weighting factor of the physical antenna 6 by β2, and the phase of the weighting factor of the physical antenna 7 by α2 and The sum of β2; where α2 and β2 are arbitrary angle values, such as 0 degrees to 2π. That is, the phases of the weighting factors of each physical antenna are: physical antennas 0 and 4 are 0, physical antennas 1 and 5 are Δ1*k+α1, Δ1*k+α2, and physical antennas 2 and 6 are Δ2*k+ β1, Δ2*k+β2, physical antenna 3, 7 are (Δ1+Δ2)*k+α1+β1, (Δ1+Δ2)*k+α2+β2, and on this basis, the physical antenna 0, 1 , any one of the antennas in 2 and 3 and the phase of the weighting factor of any one of the physical antennas 4, 5, 6 and 7 increases by π.

Optionally, when α1=α2=α, β1=β2=β, it is equivalent to increasing the phases of the weighting factors of physical antennas 1 and 5 by α, and increasing the phases of the weighting factors of physical antennas 2 and 6 by β , the phases of the weighting factors of the physical antennas 3 and 7 are added to the sum of α and β; where α and β are arbitrary angle values. That is, the phases of the weighting factors of each physical antenna are: physical antennas 0 and 4 are 0, physical antennas 1 and 5 are Δ1*k+α, physical antennas 2 and 6 are Δ2*k+β, and physical antennas 3 and 7 are (Δ1+Δ2)*k+α+β, and on this basis, the phase of the weighting factor of any one of the physical antennas 0, 1, 2, and 3 and any of the physical antennas 4, 5, 6, and 7 Increase pi.

At this time, the weighted signal of the logical port 0 is mapped to the physical antennas 0, 1, 2, and 3, which can be expressed as the following formula:

W ₀ ＝[w ₀₀ w ₀₁ w ₀₂ w ₀₃ ]

＝[1e ^-j[Δ1k+α] e ^-j[Δ2k+β] e ^{-j[(Δ1+Δ2)k+α+β+π]} ]

Where W ₀ represents the weighting of each subcarrier of the signal of logical port 0; w ₀₀ , w ₀₁ , w ₀₂ , and w ₀₃ represent physical antennas 0, 1, 2, and 3, respectively.

After the weighted signal of the logical port 1 is mapped to the physical antennas 4, 5, 6, 7, it can be expressed as the following formula:

W ₁ =[w ₁₀ w ₁₁ w ₁₂ w ₁₃ ]

=[1e ^-j[Δ1k+α ]e ^{-j[Δ2k+β+π]} e ^{-j[(Δ1+Δ2)k+α+β]} ]

Where W ₁ represents the weight of each subcarrier of the signal of logical port 1; w ₁₀ , w ₁₁ , w ₁₂ , and w ₁₃ represent physical antennas 4, 5, 6, and 7, respectively.

In the above two formulas, Δ1=Δ3, Δ2=Δ4, α1=α2=α, β1=β2=β, and the phases of the weighting factors of antenna 3 and antenna 6 are increased by π respectively.

Optionally, on the basis of the above scheme, the phases of the weighting factors of each physical antenna can also be increased at the same time in is an arbitrary angle value, such as 0 degrees to 2π. Taking α1=α2=α, β1=β2=β as an example, that is, the phases of the weighting factors of each physical antenna are respectively: physical antenna 0 and 4 are Physical antennas 1 and 5 are Physical antennas 2 and 6 are Physical antennas 3 and 7 are And on this basis, the phase of the weighting factor of any one of the physical antennas 0, 1, 2, and 3 and any one of the physical antennas 4, 5, 6, and 7 is increased by π.

When the signal transmitting device transmits signals, it makes full use of the transmitting power of each physical antenna, which will not cause the loss of the transmitting power of the base station, and the fluctuation range of the subcarrier power is relatively small, especially when one antenna fails, the performance loss will not be too big.

Embodiment three:

This embodiment provides a signal transmitting device, which is located in a communication system including 2 logical ports and 8 physical antennas. FIG. 4 is a schematic structural diagram of the signal transmitting device, as shown in FIG. 4 , including:

Memory 41, used to store process codes;

The processor 42 is configured to execute the signal weighted mapping method described in Embodiment 1 according to the process code stored in the memory 41;

The transmitter 43 is configured to transmit the signal weighted and mapped by the processor 42 .

Those of ordinary skill in the art can realize that the units and algorithm steps of the examples described in conjunction with the embodiments disclosed herein can be implemented by electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the relationship between hardware and software Interchangeability. In the above description, the composition and steps of each example have been generally described according to their functions. Whether these functions are executed by hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art may use different methods to implement the described functions for each specific application, but such implementation should not be regarded as exceeding the scope of the present invention.

Those skilled in the art can clearly understand that for the convenience and brevity of the description, the specific working process of the above-described system, device and unit can refer to the corresponding process in the foregoing method embodiment, and will not be repeated here.

In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods may be implemented in other ways. For example, the device embodiments described above are only illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or May be integrated into another system, or some features may be ignored, or not implemented. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be indirect coupling or communication connection through some interfaces, devices or units, and may also be electrical, mechanical or other forms of connection.

The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or may be distributed to multiple network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment of the present invention.

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, each unit may exist separately physically, or two or more units may be integrated into one unit. The above-mentioned integrated units can be implemented in the form of hardware or in the form of software functional units.

If the integrated unit is realized in the form of a software function unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of software products, and the computer software products are stored in a storage medium In the above, several instructions are included to make a computer device (which may be a personal computer, a worker, or a network device, etc.) execute all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-OnlyMemory), random access memory (RAM, RandomAccessMemory), magnetic disk or optical disk and other media that can store program codes.

It should be understood that the technical solutions in the embodiments of the present invention may be applied to a Long Term Evolution (LongTermEvolution, referred to as "LTE") system, an LTE Frequency Division Duplex (Freq User Equipment ncyDivisionDuplex, referred to as "FDD") system, an LTE Time Division Duplex ( Time Division Duplex, referred to as "TDD"), Universal Mobile Telecommunications System (Universal Mobile Telecommunications System, referred to as "UMTS"), Worldwide Interoperability for Microwave Access (abbreviated as "WiMAX") communication system, microwave communication system, etc.

The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person familiar with the technical field can easily think of various equivalents within the technical scope disclosed in the present invention. Modifications or replacements shall all fall within the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims (12)

1. a base station, described base station applies is in the communication system comprising 2 logic ports and 8 physical antennas, and described 2 logic ports are logic port 0,1, and described 8 physical antennas are physical antenna 0,1,2,3 and physical antenna 4,5,6,7; It is characterized in that, described base station comprises:

Processor, for the signal of logic port 0 being mapped to after weighting process physical antenna 0,1,2,3 and the signal of logic port 1 being mapped to 4,5,6,7 after weighting process, or the signal of logic port 0 is mapped to after weighting process physical antenna 4,5,6,7 and the signal of logic port 1 is mapped to physical antenna 0,1,2,3 after weighting process;

Reflector, for launching described signal.

2. base station according to claim 1, is characterized in that, wherein the amplitude of the weighted factor of each physical antenna is 1;

The phase place of the weighted factor of each physical antenna is respectively: physical antenna 0,4 is 0, physical antenna 1,5 is Δ 1*k, physical antenna 2,6 is Δ 2*k, physical antenna 3,7 is (Δ 1+ Δ 2) * k, and on this basis in physical antenna 0,1,2,3 in any one antenna and physical antenna 4,5,6,7 weighted factor of any one antenna phase place more than a π, wherein Δ 1 and Δ 2 are the phase difference between adjacent sub-carrier, and k is subcarrier number.

3. base station according to claim 2, is characterized in that, the phase place of the weighted factor of described each physical antenna also comprises:

The phase place of the weighted factor of physical antenna 1,2,3 is increased respectively again α 1, β 1, α 1 with β's 1 and; Wherein α 1 and β 1 is arbitrary angle value.

4. according to the method in claim 2 or 3, it is characterized in that, the phase place of the weighted factor of described each physical antenna also comprises:

The phase place of the weighted factor of physical antenna 5,6,7 is increased respectively again α 2, β 2, α 2 with β's 2 and; Wherein α 2 and β 2 is arbitrary angle values.

5. the base station according to Claims 2 or 3, is characterized in that, the phase place of the weighted factor of described each physical antenna also comprises:

The phase place of the weighted factor of each physical antenna is increased simultaneously again wherein it is arbitrary angle value.

6. method according to claim 4, is characterized in that, the phase place of the weighted factor of described each physical antenna also comprises:

The phase place of the weighted factor of each physical antenna is increased simultaneously again wherein it is arbitrary angle value.

7. a signal transmitting method, be applied in the communication system comprising 2 logic ports and 8 physical antennas, described 2 logic ports are logic port 0,1, and described 8 physical antennas are physical antenna 0,1,2,3 and physical antenna 4,5,6,7, it is characterized in that, described method comprises:

The signal of logic port 0 be mapped to after weighting process physical antenna 0,1,2,3 and the signal of logic port 1 is mapped to 4,5,6,7 after weighting process, or the signal of logic port 0 be mapped to after weighting process physical antenna 4,5,6,7 and the signal of logic port 1 is mapped to physical antenna 0,1,2,3 after weighting process;

Launch described signal.

8. method according to claim 7, is characterized in that, wherein the amplitude of the weighted factor of each physical antenna is 1;

The phase place of the weighted factor of each physical antenna is respectively: physical antenna 0,4 is 0, physical antenna 1,5 is Δ 1*k, physical antenna 2,6 is Δ 2*k, physical antenna 3,7 is (Δ 1+ Δ 2) * k, and on this basis in physical antenna 0,1,2,3 in any one antenna and physical antenna 4,5,6,7 weighted factor of any one antenna phase place more than a π, wherein Δ 1 and Δ 2 are the phase difference between adjacent sub-carrier, and k is subcarrier number.

9. method according to claim 8, is characterized in that, the phase place of the weighted factor of described each physical antenna also comprises:

The phase place of the weighted factor of physical antenna 1,2,3 is increased respectively again α 1, β 1, α 1 with β's 1 and; Wherein α 1 and β 1 is arbitrary angle value.

10. method according to claim 8 or claim 9, it is characterized in that, the phase place of the weighted factor of described each physical antenna also comprises:

The phase place of the weighted factor of physical antenna 5,6,7 is increased respectively again α 2, β 2, α 2 with β's 2 and; Wherein α 2 and β 2 is arbitrary angle values.

11. methods according to claim 8 or claim 9, it is characterized in that, the phase place of the weighted factor of described each physical antenna also comprises:

The phase place of the weighted factor of each physical antenna is increased simultaneously again wherein it is arbitrary angle value.

12. methods according to claim 11, is characterized in that, the phase place of the weighted factor of described each physical antenna also comprises:

The phase place of the weighted factor of each physical antenna is increased simultaneously again wherein it is arbitrary angle value.