CN105934989A - Signal transmission device and method - Google Patents

Signal transmission device and method Download PDF

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Publication number
CN105934989A
CN105934989A CN201480060090.1A CN201480060090A CN105934989A CN 105934989 A CN105934989 A CN 105934989A CN 201480060090 A CN201480060090 A CN 201480060090A CN 105934989 A CN105934989 A CN 105934989A
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transmitting
millimeter wave
determined
transmission
signal
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张永平
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation

Abstract

The present invention relates to wireless communication technology, and in particular to a signal transmission device and method, which are used for effectively improving the performance of a system by considering the influence of environmental factors on a transmission pre-coding matrix during signal transmission. The signal transmission device provided in the embodiments of the present invention is located in a transmitting end in a millimetre wave system, and comprises: a processing unit used for acquiring environment information of an environment where a wireless channel is located between the transmitting end and a receiving end in the millimetre wave system, determining a transmission pre-coding matrix Vt according to the acquired environment information, and processing a transmission signal according to the determined transmission pre-coding matrix Vt; and a transmission unit used for transmitting a millimetre wave signal obtained by processing via the processing unit to the receiving end. The transmitting end determines the transmission pre-coding matrix Vt according to the acquired environment information, the influence of the environmental factors on the transmission pre-coding matrix is considered, and therefore the performance of the system can be effectively improved.

Description

Signal transmission device and method Technical Field
The present invention relates to wireless communication technologies, and in particular, to a signal transmission apparatus and method.
Background
The wavelength range of signals in the frequency range of 30GHz to 300GHz is 10 mm to 1 mm, and is called "millimeter wave", communication using millimeter waves is called "millimeter wave communication", and a system using millimeter wave communication is called "millimeter wave system".
On the one hand, millimeter wave signals are very susceptible to rainfall compared to signals of conventional cellular networks operating in the microwave frequency band below 5 GHz. The influence of rainfall on the millimeter wave signal mainly comprises the following two aspects: absorption and scattering. First, rainfall will absorb the energy of the millimeter wave signal, making the large scale fading, which is very severe due to severe path loss, even more severe; secondly, the signal received by the receiving end is a signal obtained by superposing a plurality of signals from different propagation paths due to the scattering of the millimeter wave signal caused by rainfall.
In order to counter the influence of rainfall on the performance of receiving signals at a receiving end, in a scheme in the prior art, in the system design process, the influence of rainfall is summarized as the attenuation of millimeter wave signals when a link is designed, and when the maximum transmitting power is set, a rain attenuation factor is superposed on a normal large-scale fading factor, wherein the rain attenuation factor can be the attenuation factor of the rainfall with the maximum probability intensity for attenuating the millimeter wave signals.
On the other hand, considering that the path loss of the millimeter wave signal is very severe in the propagation process, and the path loss causes large-scale fading of the millimeter wave signal, in the millimeter wave system, a large number of antennas are usually configured at the transmitting end and the receiving end, and the large path loss is compensated by using the Beamforming (BF) gain of a Multiple-Input Multiple-Output (MIMO) system.
Multipath transmission of signals caused by scattering of millimeter wave signals can cause the amplitude and phase of coefficients in a channel matrix to change, so that a precoding matrix corresponding to a subchannel capable of realizing the best channel quality changes. In the above scheme, the rain attenuation factor is only superimposed on the normal large-scale fading coefficient, and the original precoding matrix is still used for transmission, so that the expected power gain cannot be obtained.
In summary, in the existing millimeter wave system that uses the MIMO technology for data transmission, only the large path loss and the absorption of environmental factors such as rainfall, which are suffered by the millimeter wave signal during the transmission process, are considered to absorb the signal energy, and the influence of the environmental factors such as rainfall on the transmission precoding matrix is not considered, so that the system performance is not significantly improved.
Disclosure of Invention
The embodiment of the invention provides a signal transmission device and a signal transmission method, which are applied to a millimeter wave system for data transmission in an MIMO mode and are used for considering the influence of environmental factors on a transmission precoding matrix when transmitting signals and effectively improving the system performance.
In a first aspect, an embodiment of the present invention provides a signal transmitting apparatus, located in a transmitting end in a millimeter wave system, including:
the processing unit is used for acquiring environment information of an environment where a wireless channel between the transmitting end and the receiving end is located in the millimeter wave system; determining a transmitting pre-coding matrix V according to the acquired environment informationt(ii) a According to the determined transmission precoding matrix VtProcessing the transmitting signal;
and the transmitting unit is used for transmitting the millimeter wave signal obtained after the processing of the processing unit to the receiving end.
With reference to the first aspect, in a first possible implementation manner, the processing unit is specifically configured to:
determining a transmission correlation array according to the acquired environment information, wherein H is a channel matrix of a wireless channel between the transmitting end and the receiving endHPerforming conjugate transposition to express an expected value;
determining the transmission pre-coding matrix V according to the determined transmission correlation matrixt。
With reference to the first possible implementation manner of the first aspect, in a second possible implementation manner, the processing unit is specifically configured to:
determining the transmit precoding matrix V according to a formulatA saidtIs a diagonal matrix.
With reference to the first aspect, in a third possible implementation manner,
the processing unit is further to: after the environment information is acquired and before the emission signal processing is performed, determining a power distribution coefficient of each data stream contained in the millimeter wave signal according to the acquired environment information;
the processing unit is specifically configured to:
according to the determined transmission precoding matrix VtAnd the determined power distribution coefficient of each data stream contained in the millimeter wave signal, and processing the transmitting signal.
With reference to the third possible implementation manner of the first aspect, in a fourth possible implementation manner, the processing unit is specifically configured to:
determining a transmission correlation array according to the acquired environment information, wherein H is a channel matrix of a wireless channel between the transmitting end and the receiving endHPerforming conjugate transposition to express an expected value;
and determining the power distribution coefficient of each data stream contained in the millimeter wave signal according to the determined transmitting correlation array.
With reference to the fourth possible implementation manner of the first aspect, in a fifth possible implementation manner, the processing unit is specifically configured to:
obtaining diagonal matrix Lambda according to a formulat；
According to diagonal matrix ΛtAnd elements on the diagonal line determine the power distribution coefficient of each data stream contained in the millimeter wave signal.
With reference to the first possible implementation manner, the second possible implementation manner, the fourth possible implementation manner, or the fifth possible implementation manner of the first aspect, in a sixth possible implementation manner, the processing unit is specifically configured to:
determining an electromagnetic wave propagation parameter of the millimeter wave signal according to the acquired environment information;
determining the emission correlation array according to the determined electromagnetic wave transmission parameters
With reference to the sixth possible implementation manner of the first aspect, in a seventh possible implementation manner, the electromagnetic wave transmission parameter includes at least one of the following parameters:
the depth of absorption;
the scattering depth;
an optical depth;
anisotropy is observed.
With reference to the first aspect or any one of the first to seventh possible implementation manners of the first aspect, in an eighth possible implementation manner, the environment information includes: rainfall intensity information.
With reference to the eighth possible implementation manner of the first aspect, in a ninth possible implementation manner, the environment information further includes: ambient temperature information.
In a second aspect, an embodiment of the present invention provides a signal receiving apparatus, located in a receiving end in a millimeter wave system, including:
the receiving unit is used for receiving the millimeter wave signal transmitted by the transmitting terminal in the millimeter wave system;
the processing unit is used for demodulating the millimeter wave signal received by the receiving unit to obtain a demodulated signal;
wherein the millimeter wave signal is transmitted by the transmitting end according to a transmission precoding matrix VtThe signal is obtained after the emission signal processing is carried out;
the transmission precoding matrix VtThe transmitting end is determined according to the acquired environment information of the environment where the wireless channel between the transmitting end and the receiving end is located in the millimeter wave system.
With reference to the second aspect, in a first possible implementation manner, the transmit precoding matrix VtThe transmitting terminal determines a transmitting correlation array according to the acquired environment information and determines the transmitting correlation array according to the determined transmitting correlation array;
wherein H is a channel matrix of a wireless channel between the transmitting end and the receiving end, ()HThe representation is subjected to conjugate transpose, and the representation takes the expected value.
With reference to the first possible implementation manner of the second aspect, in a second possible implementation manner, the transmit precoding matrix VtIs determined by the transmitting terminal according to a formula, the ΛtIs a diagonal matrix.
With reference to the second aspect, in a third possible implementation manner,
the millimeter wave signal is the precoding matrix V of the transmitting end according to the transmissiontAnd the power distribution coefficient of each data stream contained in the millimeter wave signal is determined after the transmission signal processing is carried out;
and the power distribution coefficient of each data stream contained in the millimeter wave signal is determined by the transmitting terminal according to the acquired environment information.
With reference to the third possible implementation manner of the second aspect, in a fourth possible implementation manner, the power distribution coefficient of each data stream included in the millimeter wave signal is determined by the transmitting end according to the obtained environment information, determining a transmission correlation array, and determining the transmission correlation array;
wherein H is a channel matrix of a wireless channel between the transmitting end and the receiving end, ()HThe representation is subjected to conjugate transpose, and the representation takes the expected value.
With reference to the fourth possible implementation manner of the second aspect, in a fifth possible implementation manner, the power distribution coefficient of each data stream included in the millimeter wave signal is obtained by the transmitting end according to a formula as the diagonal matrix ΛtAccording to the obtained diagonal matrix LambdatIs determined by the elements on the diagonal of (a).
With reference to the first possible implementation manner, the second possible implementation manner, the fourth possible implementation manner, or the fifth possible implementation manner of the second aspect, in a sixth possible implementation manner, the transmission correlation array is determined by the transmitting end according to the acquired environment information, and determining according to the determined electromagnetic wave transmission parameter, an electromagnetic wave propagation parameter of the millimeter wave signal.
With reference to the sixth possible implementation manner of the second aspect, in a seventh possible implementation manner, the electromagnetic wave transmission parameter includes at least one of the following parameters:
the depth of absorption;
the scattering depth;
an optical depth;
anisotropy is observed.
With reference to the second aspect or any one of the first possible implementation manner to the seventh possible implementation manner of the second aspect, in an eighth possible implementation manner, the environment information includes: rainfall intensity information.
With reference to the eighth possible implementation manner of the second aspect, in a ninth possible implementation manner, the environment information further includes: ambient temperature information.
In a third aspect, an embodiment of the present invention provides a signal transmitting method, including:
the method comprises the steps that a transmitting end obtains environment information of an environment where a wireless channel between the transmitting end and a receiving end in a millimeter wave system is located;
the transmitting terminal determines a transmitting precoding matrix V according to the acquired environment informationt；
The transmitting terminal transmits a precoding matrix V according to the determined transmission precoding matrixtProcessing the transmitting signal;
and the transmitting terminal transmits the millimeter wave signal obtained after the processing to the receiving terminal.
With reference to the third aspect, in a first possible implementation manner, the transmitting end determines a transmission precoding matrix V according to the obtained environment informationtThe method comprises the following steps:
the transmitting terminal determines a transmitting correlation array according to the acquired environment information, wherein H is a channel matrix of a wireless channel between the transmitting terminal and the receiving terminal, (.)HPerforming conjugate transposition to express an expected value;
the transmitting terminalDetermining the transmission pre-coding matrix V according to the determined transmission correlation matrixt。
With reference to the first possible implementation manner of the third aspect, in a second possible implementation manner, the transmitting end determines the transmission precoding matrix V according to the determined transmission correlation matrixtThe method comprises the following steps:
the transmitting terminal determines the transmitting pre-coding matrix V according to a formulatA saidtIs a diagonal matrix.
With reference to the third aspect, in a third possible implementation manner,
after the transmitting end acquires the environment information and before the transmitting signal processing, the method further comprises:
the transmitting terminal determines the power distribution coefficient of each data stream contained in the millimeter wave signal according to the acquired environment information;
the transmitting terminal transmits a precoding matrix V according to the determined transmission precoding matrixtAnd performing transmission signal processing, including:
the transmitting terminal transmits a precoding matrix V according to the determined transmission precoding matrixtAnd the determined power distribution coefficient of each data stream contained in the millimeter wave signal, and processing the transmitting signal.
With reference to the third possible implementation manner of the third aspect, in a fourth possible implementation manner, the determining, by the transmitting end, a power distribution coefficient of each data stream included in the millimeter wave signal according to the obtained environment information includes:
the transmitting terminal determines a transmitting correlation array according to the acquired environment information, wherein H is a channel matrix of a wireless channel between the transmitting terminal and the receiving terminal, (.)HPerforming conjugate transposition to express an expected value;
and the transmitting end determines the power distribution coefficient of each data stream contained in the millimeter wave signal according to the determined transmitting correlation array.
With reference to the fourth possible implementation manner of the third aspect, in a fifth possible implementation manner, the determining, by the transmitting end, a power distribution coefficient of each data stream included in the millimeter wave signal according to the determined transmission correlation array includes:
the transmitting terminal obtains a diagonal matrix Lambda according to a formulat；
The transmitting terminal is based on the diagonal matrix lambdatAnd elements on the diagonal line determine the power distribution coefficient of each data stream contained in the millimeter wave signal.
With reference to the first possible implementation manner, the second possible implementation manner, the fourth possible implementation manner, or the fifth possible implementation manner of the third aspect, in a sixth possible implementation manner, the determining, by the transmitting end, the transmit correlation array according to the acquired environment information includes:
the transmitting terminal determines the electromagnetic wave propagation parameters of the millimeter wave signals according to the acquired environment information;
the transmitting terminal determines the transmitting correlation array according to the determined electromagnetic wave transmission parameters
With reference to the sixth possible implementation manner of the third aspect, in a seventh possible implementation manner, the electromagnetic wave transmission parameter includes at least one of the following parameters:
the depth of absorption;
the scattering depth;
an optical depth;
anisotropy is observed.
With reference to the third aspect or any one of the first possible implementation manner to the seventh possible implementation manner of the third aspect, in an eighth possible implementation manner, the environment information includes: rainfall intensity information.
With reference to the eighth possible implementation manner of the third aspect, in a ninth possible implementation manner, the environment information further includes: ambient temperature information.
In a fourth aspect, an embodiment of the present invention provides a signal receiving method, including:
the receiving end receives the millimeter wave signal transmitted by the transmitting end;
the receiving end demodulates the received millimeter wave signal to obtain a demodulated signal;
wherein the millimeter wave signal is transmitted by the transmitting end according to a transmission precoding matrix VtThe signal is obtained after the emission signal processing is carried out;
the transmission precoding matrix VtThe transmitting end is determined according to the acquired environment information of the environment where the wireless channel between the transmitting end and the receiving end is located in the millimeter wave system.
With reference to the fourth aspect, in a first possible implementation manner, the transmit precoding matrix VtThe transmitting terminal determines a transmitting correlation array according to the acquired environment information and determines the transmitting correlation array according to the determined transmitting correlation array;
wherein H is a channel matrix of a wireless channel between the transmitting end and the receiving end, ()HThe representation is subjected to conjugate transpose, and the representation takes the expected value.
With reference to the first possible implementation manner of the fourth aspect, in a second possible implementation manner, the transmit precoding matrix VtIs determined by the transmitting terminal according to a formula, the ΛtIs a diagonal matrix.
With reference to the fourth aspect, in a third possible implementation manner,
the millimeter wave signal is the precoding matrix V of the transmitting end according to the transmissiontAnd the power distribution coefficient of each data stream contained in the millimeter wave signal is determined after the transmission signal processing is carried out;
and the power distribution coefficient of each data stream contained in the millimeter wave signal is determined by the transmitting terminal according to the acquired environment information.
With reference to the third possible implementation manner of the fourth aspect, in a fourth possible implementation manner, the power distribution coefficient of each data stream included in the millimeter wave signal is determined by the transmitting end according to the obtained environment information, determining a transmission correlation array, and determining the transmission correlation array;
wherein H is the transmitting endA channel matrix of a wireless channel with the receiving end, ()HThe representation is subjected to conjugate transpose, and the representation takes the expected value.
With reference to the fourth possible implementation manner of the fourth aspect, in a fifth possible implementation manner, the power distribution coefficient of each data stream included in the millimeter wave signal is obtained by the transmitting end according to a formula as the diagonal matrix ΛtAccording to the obtained diagonal matrix LambdatIs determined by the elements on the diagonal of (a).
With reference to the first possible implementation manner, the second possible implementation manner, the fourth possible implementation manner, or the fifth possible implementation manner of the fourth aspect, in a sixth possible implementation manner, the transmission correlation array is determined by the transmitting end according to the acquired environment information, and determining according to the determined electromagnetic wave transmission parameter, an electromagnetic wave propagation parameter of the millimeter wave signal.
With reference to the sixth possible implementation manner of the fourth aspect, in a seventh possible implementation manner, the electromagnetic wave transmission parameter includes at least one of the following parameters:
the depth of absorption;
the scattering depth;
an optical depth;
anisotropy is observed.
With reference to the fourth aspect or any one of the first possible implementation manner to the seventh possible implementation manner of the fourth aspect, in an eighth possible implementation manner, the environment information includes: rainfall intensity information.
With reference to the eighth possible implementation manner of the fourth aspect, in a ninth possible implementation manner, the environment information further includes: ambient temperature information.
To sum up, the embodiments of the present invention provide a signal transmission apparatus and method, wherein a transmitting end determines a transmitting precoding matrix V according to acquired environment informationtThe influence of environmental factors on the transmitting precoding matrix is considered, and the system performance can be effectively improved.
Drawings
Fig. 1 is a schematic structural diagram of a millimeter wave system according to an embodiment of the present invention;
FIG. 2 shows the results of H under various rainfall intensitiesHH, a diagram of eigenvalues and traces;
FIG. 3a is a schematic diagram of channel capacity of a millimeter wave system with a frequency of 38GHz in a rainfall environment;
FIG. 3b is a schematic diagram of channel capacity of a millimeter wave system with a frequency of 75GHz in a rainfall environment;
FIGS. 4 a-4 d are graphs comparing the rate achievable by millimeter-wave system 20 with the desired capacity using embodiments of the present invention;
fig. 5 is a flowchart of a signal transmitting method according to an embodiment of the present invention;
fig. 6 is a flowchart of a signal receiving method according to an embodiment of the present invention.
Detailed Description
The embodiment of the invention provides a signal transmission device and a signal transmission method, which are applied to a millimeter wave system for data transmission in an MIMO mode and are used for considering the influence of environmental factors on a transmission precoding matrix when a transmitting end transmits signals and effectively improving the system performance.
In the signal transmitting device provided by the embodiment of the invention, a processing unit acquires environment information of an environment where a wireless channel between a transmitting end and a receiving end is located in the millimeter wave system; determining a transmitting pre-coding matrix V according to the acquired environment informationt(ii) a According to the determined transmitting pre-coding matrix VtAnd carrying out transmitted signal processing, and transmitting the millimeter wave signal obtained after the processing to a receiving end.
Wherein, according to the acquired environment information, a transmitting pre-coding matrix V is determinedtThe influence of environmental factors on the transmitting precoding matrix is considered, and the system performance can be effectively improved.
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
As shown in fig. 1, the millimeter wave system 20 provided in the embodiment of the present invention includes a transmitting end 30 and a receiving end 40, where the transmitting end 30 transmits a millimeter wave signal to the receiving end 40, and data transmission is performed between the transmitting end 30 and the receiving end 40 in an MIMO mode.
The transmitting terminal 30 includes a signal transmitting device 10 therein, and the device 10 includes:
a processing unit 1001, configured to obtain environment information of an environment where a wireless channel between a transmitting end 30 and a receiving end 40 in the millimeter wave system 20 is located; determining a transmitting pre-coding matrix V according to the acquired environment informationt(ii) a According to the determined transmission precoding matrix VtProcessing the transmitting signal;
a transmitting unit 1002, configured to transmit the millimeter wave signal processed by the processing unit 1001 to the receiving end 40.
The processing unit 1001 may be a processor, and the transmitting unit 1002 may be a transmitter.
The receiving end 40 includes a signal receiving apparatus 11 therein, and the apparatus 11 includes:
a receiving unit 1101, configured to receive a millimeter wave signal transmitted by the transmitting end 30;
the processing unit 1102 is configured to demodulate the millimeter wave signal received by the receiving unit 1101, and obtain a demodulated signal.
The receiving unit 1101 may be a receiver, and the processing unit 1102 may be a processor.
The millimeter wave system 20 performs data transmission in an MIMO mode, the transmitting end 30 is configured with a plurality of transmitting antennas, and the receiving end 40 is configured with a plurality of receiving antennas. For example, if the millimeter wave system 20 is an NxM MIMO system, N transmitting antennas are arranged at the transmitting end 30, and M receiving antennas are arranged at the receiving end 40.
As described above, in order to compensate for large-scale fading, in the millimeter wave system, the transmitting end and the receiving end are configured with a large number of antennas, such as: in the millimeter wave system 20, N is 100.
Generally, in the MIMO system, antenna configuration parameters of a transmitting end and a receiving end are set in advance and stored in the transmitting end and the receiving end, respectively.
Let the channel matrix of the radio channel between the transmitting end 30 and the receiving end 40 be
The present invention will be described below by taking a rainfall environment as an exampleIn the embodiment, the processing unit 1002 determines the transmitting pre-coding matrix V according to the environment informationtThe multiplexing gain is obtained, and the performance of the millimeter wave system 20 is improved.
As described above, rainfall causes strong scattering of the millimeter wave signal, and the scattering reduces the correlation between the antennas at the transmitting end in the millimeter wave system 20 as the MIMO system and reduces the correlation between the antennas at the receiving end. The reduced correlation between the antennas will give millimeter-wave system 20 the opportunity to obtain multiplexing gain.
In a MIMO system, when there is strong correlation between antennas, under normal transmit SNR conditions (e.g., non-infinite SNR of 30dB or less), only Beamforming gain can be obtained, but multiplexing gain is difficult to obtain.
This is mainly because when the antennas are strongly correlated, for HHWhen H is subjected to eigenvalue decomposition, the eigenvalues except the maximum eigenvalue are all very small. And HHThe eigenvalues of H represent the channel quality of each subchannel in the channel, which means that no other subchannel except the subchannel for which the maximum eigenvalue corresponds is sufficient for signal transmissionHIndicating that conjugate transposing is performed.
Generally, when the quality difference of each sub-channel is very different, the optimal transmission mode is: the power is distributed to the sub-channels with good channel quality as much as possible, and the use of other sub-channels with poor channel quality for transmitting data is avoided as much as possible. In this case, better system performance can be obtained by using Beamforming transmission method to transmit data in the MIMO system.
Rainfall may be HHThe respective eigenvalues of H tend to be the same. Take a MIMO system of 51x51 with a frequency of 38GHz as an example, wherein 51x51 indicates that 51 transmitting antennas and 51 receiving antennas are configured. Referring to fig. 2, the abscissa represents the rainfall intensity, and represents a non-rainfall environment when the rainfall intensity is 0; the longitudinal axis is HH1 st, 2 nd, 11 th, 21 st, 31 st, 41 st, 51 st eigenvalue and trace of H. Wherein the feature values are arranged in descending order.
As can be seen from fig. 2: the trace and the 1 st characteristic value (i is 1) are gradually reduced along with the increase of rainfall intensity; while other characteristic values exhibit a unimodal characteristic, which first increases rapidly with increasing rainfall intensity, reaches a maximum at a certain rainfall intensity, and then decreases gradually with increasing rainfall intensity. However, it can be seen that, even when the rainfall intensity is 100 mm/h, all the other characteristic values except the 1 st characteristic value are larger than those in the non-rainfall environment. This shows that in a rainfall environment, there are more sub-channels potentially available for data transmission, which can compensate for large scale fading caused by rainfall by using the potential multiplexing gain without increasing the transmission power.
To demonstrate the above, fig. 3a and 3b show the channel capacity of the millimeter wave system at frequencies of 38GHz and 75GHz, respectively, under rainfall conditions, where the SNR is 0 dB. As can be seen from fig. 3a and 3b, under various MIMO configurations, the channel capacity of the rainy millimeter wave system exhibits a single-peak characteristic, and in a certain rainfall intensity range, for example: for a 26x26MIMO system with the frequency of 38GHz, the multiplexing gain is even larger than the large-scale fading caused by rainfall under the condition that the rainfall intensity R satisfies 0< R ≦ 20 mm/h, so that the multiplexing gain can be used for obtaining larger channel capacity than under the non-rainfall environment. The Channel capacity in fig. 3a and 3b is the maximum communication rate that can be obtained when the transmitting end acquires the Channel State Information (CSI) of all the subchannels.
The principle of obtaining the multiplexing gain under the rainfall condition in the embodiment of the present invention is explained above. Next, a specific scheme of the transmitting end 30 obtaining the multiplexing gain in the embodiment of the present invention is specifically described. The main idea of the scheme includes that the transmitting terminal 30 determines a transmitting pre-coding matrix according to the environment information, and performs transmitting signal processing according to the transmitting pre-coding matrix. Wherein, the transmitting pre-coding matrix is set according to the environment information, and the influence of the environment factors on the transmitting pre-coding matrix is considered.
Specifically, the processing unit 1001 may adopt, when acquiring the environment information, the following two ways including, but not limited to:
in the first mode, the processing unit 1001 measures the environmental parameters through a sensor built in or externally connected to the transmitting terminal 30 to obtain environmental information including environmental parameter values;
in a second mode, the processing unit 1001 may receive notification messages from other systems, such as: and receiving a notification message sent by a meteorological system, wherein the message carries environmental information.
In the rainfall environment, the environmental information may include rainfall intensity information, such as: the foregoing units are rainfall intensity in millimeters per hour; further, the environmental information may also include ambient temperature information.
Specifically, after acquiring the environment information, the processing unit 1001 determines the transmit correlation array according to the acquired environment information, and then determines the transmit precoding matrix V according to the determined transmit correlation arraytThen, according to the determined transmission precoding matrix VtProcessing the transmitting signal; or
After acquiring the environment information, the processing unit 1001 determines, according to the acquired environment information, an option of a transmission correlation array, and may also determine, according to pre-stored system configuration parameters, such as the number and spacing of antennas, the distance between the transmitting end 30 and the receiving end 40, a transmission correlation array, and then determine, according to the determined transmission correlation array, a transmission precoding matrix VtDistributing transmission power for each data stream contained in the millimeter wave signal, and then, according to the determined transmission precoding matrix VtAnd the power value of the transmission power distributed to each data stream is used for processing the transmission signal. Where the representation takes an expected value.
Specifically, the processing unit 1001 may determine the transmit correlation array according to the acquired environment information in the following manner
Taking a rainfall environment as an example, first, the processing unit 1001 may obtain an electromagnetic wave propagation parameter of the millimeter wave signal based on environmental information such as rainfall intensity, temperature, and the like and a working carrier frequency according to the Mie solution;
wherein the electromagnetic wave propagation parameter may comprise at least one of the following parameters:
absorption depth τa；
Scattering depth τs；
Optical depth τo；
Anisotropy αp。
The scheme of the processing unit 1001 for obtaining the above electromagnetic wave propagation parameters can refer to the description in the following references: an article "MATLAB function of Mie Scattering and Absorption" published by Christian Matzler at 2002, 8 months (accession No. 2002-11) (Christian Matzler, "MATLAB functions for Mie Scattering and Absorption," Research Report No.2002-11, Aug. 2002).
Then, the processing unit 1001 estimates the transmit correlation matrix by the following formula one:
… … formula one
Wherein λ represents the wavelength of the millimeter wave signal, η represents the Antenna gain at both ends of the transmitting end and the receiving end, and D represents the distance between the transmitting end and the receiving end, each element of ⊙ represents the Hadamard (Hadamard) product, which is a matrix related to the Antenna, for example, Uniform Linear Antenna Array (ULA), GtThe expression of the elements in the matrix is: wherein
After obtaining the transmit correlation matrix, the processing unit 1001 may determine the transmit precoding matrix V according to the transmit correlation matrixtAnd allocating transmission power to each data stream contained in the millimeter wave signal.
Specifically, the processing unit 1001 may perform eigenvalue decomposition on the transmit correlation array to obtain the following formula two:
… … formula two
The processing unit 1001 will apply the matrix VtAs a transmit precoding matrix, where VtEach column of (a) is used for transmit precoding one data stream;
processing unit 1001 according to diagonal matrix ΛtThe diagonal elements determine the power distribution coefficients for each data stream, and the obtained power distribution matrix P is a diagonal matrix, wherein the elements except the diagonal elements are all 0, and the diagonal elements are non-negative values.
Here, in the power allocation, an equal allocation method may be adopted, and the total power is equally allocated to all data streams. Alternatively, a method of power injection may be used, and a specific method of power injection may be referred to the related introduction in chapter 4 of Wireless Communications, edited by a. goldsmith (a. goldsmith, Wireless Communications, Cambridge University Press, New York, NY, u.s.a.2005), published by the University of Cambridge, New York, n.y.2005.
By adopting a power water filling algorithm, power can be preferentially distributed to the sub-channel with the best channel quality; then, if power remains, the sub-channel with the second best channel quality is allocated, and so on.
Finally, the processing unit 1001 determines the transmit precoding matrix V according totAnd determining the power distribution coefficient of each data stream contained in the millimeter wave signal, and processing the transmitted signal.
Specifically, the finally transmitted millimeter wave signal may be expressed as x ═ VtPS, where the data is actually transmitted.
The principle of obtaining the multiplexing gain under the rainfall condition and the specific scheme of obtaining the multiplexing gain by the transmitting terminal in the embodiment of the invention are introduced above.
The technical effect of the embodiment of the present invention to obtain the multiplexing gain is described by simulation below.
In the embodiment of the invention, the channel statistical characteristics are fully utilized, the transmitting precoding matrix is determined according to the environment information, and the performance of the millimeter wave system in the rainfall environment can be improved on the premise of not improving the transmitting power and the channel feedback.
As can be seen from fig. 3a and fig. 3b, under a certain rainfall intensity, the ideal channel capacity is much larger than the channel capacity when it is not raining (i.e. when the rainfall intensity is 0).
Referring to fig. 4a to 4d, where Ropt denotes an ideal channel capacity, Rswf denotes a channel capacity that can be achieved by using the scheme provided by the embodiment of the present invention, and in fig. 4a, the system frequency is 38GHz, and a symmetric MIMO configuration is adopted; in FIG. 4b, the system frequency is 75GHz, and a symmetrical MIMO configuration is adopted; in FIG. 4c, the system frequency is 38GHz, and an asymmetric MIMO configuration is adopted; in fig. 4d, the system frequency is 75GHz, and an asymmetric MIMO configuration is adopted, wherein the "symmetric MIMO configuration" indicates that the number of transmitting antennas and receiving antennas is equal; "asymmetric MIMO configuration" means that the number of transmit antennas and receive antennas are not equal.
As can be seen from fig. 4a to 4d, the channel capacity approaches the ideal channel capacity for the scheme provided by the embodiment of the present invention. In other words, by adopting the scheme provided by the embodiment of the invention, extra multiplexing gain can be obtained, and the performance loss of the millimeter wave communication system caused by rainfall can be compensated to a certain extent.
Based on the same inventive concept, the embodiment of the invention also provides a signal transmitting method and a signal receiving method. The principle of solving the problem of the signal transmitting method is similar to that of the signal transmitting device provided by the embodiment of the invention, the principle of solving the problem of the signal receiving method is similar to that of the signal receiving device provided by the embodiment of the invention, and the implementation of the signal transmitting method and the signal receiving method can respectively refer to the implementation of corresponding devices, and repeated details are omitted.
Fig. 5 is a flowchart of a signal transmitting method according to an embodiment of the present invention. As shown in fig. 5, the method includes the steps of:
s501: the method comprises the steps that a transmitting end obtains environment information of an environment where a wireless channel between the transmitting end and a receiving end in a millimeter wave system is located;
s502: the transmitting terminal determines a transmitting pre-coding matrix V according to the acquired environment informationt；
S503: the transmitting terminal transmits a precoding matrix V according to the determined transmission precoding matrixtProcessing the transmitting signal;
s504: and the transmitting terminal transmits the millimeter wave signal obtained after the processing to the receiving terminal.
Optionally, the transmitting end determines a transmitting precoding matrix V according to the obtained environment informationtThe method comprises the following steps:
the transmitting end determines a transmitting correlation array according to the acquired environment information, wherein H is a channel matrix of a wireless channel between the transmitting end and the receiving endHPerforming conjugate transposition to express an expected value;
the transmitting end transmits the correlation according to the determined transmissionArray determination transmit precoding matrix Vt。
Optionally, the transmitting end determines a transmitting precoding matrix V according to the determined transmitting correlation matrixtThe method comprises the following steps:
the transmitting terminal determines a transmitting precoding matrix V according to a formulat，ΛtIs a diagonal matrix.
Optionally, after the transmitting end acquires the environment information and before the transmitting end performs the transmitting signal processing, the method further includes:
the transmitting terminal determines the power distribution coefficient of each data stream contained in the millimeter wave signal according to the acquired environment information;
the transmitting terminal transmits a precoding matrix V according to the determined transmission precoding matrixtAnd performing transmission signal processing, including:
the transmitting terminal transmits a precoding matrix V according to the determined transmission precoding matrixtAnd determining the power distribution coefficient of each data stream contained in the millimeter wave signal, and processing the transmitted signal.
Optionally, the determining, by the transmitting end, the power distribution coefficient of each data stream included in the millimeter wave signal according to the acquired environment information includes:
the transmitting end determines a transmitting correlation array according to the acquired environment information, wherein H is a channel matrix of a wireless channel between the transmitting end and the receiving endHPerforming conjugate transposition to express an expected value;
and the transmitting terminal determines the power distribution coefficient of each data stream contained in the millimeter wave signal according to the determined transmission correlation array.
Optionally, the determining, by the transmitting end, the power distribution coefficient of each data stream included in the millimeter wave signal according to the determined transmission correlation array includes:
the transmitting terminal obtains the diagonal matrix lambda according to a formulat；
Transmitting terminal according to diagonal matrix lambdatThe elements on the diagonal line determine the power distribution coefficient of each data stream contained in the millimeter wave signal.
Optionally, the determining, by the transmitting end, the transmission correlation array according to the acquired environment information includes:
the transmitting terminal determines the electromagnetic wave propagation parameters of the millimeter wave signals according to the acquired environment information;
the transmitting terminal determines a transmitting correlation array according to the determined electromagnetic wave transmission parameters
Optionally, the electromagnetic wave transmission parameters include at least one of the following parameters:
the depth of absorption;
the scattering depth;
an optical depth;
anisotropy is observed.
Optionally, the environment information includes: rainfall intensity information.
Optionally, the environment information further includes: ambient temperature information.
Fig. 6 is a flowchart of a signal transmitting method according to an embodiment of the present invention. As shown in fig. 6, the method includes the steps of:
s601: the receiving end receives the millimeter wave signal transmitted by the transmitting end;
s602: the receiving end demodulates the received millimeter wave signal to obtain a demodulated signal;
wherein, the millimeter wave signal is transmitted by the transmitting terminal according to the transmission precoding matrix VtThe signal is obtained after the emission signal processing is carried out;
transmitting a precoding matrix VtThe transmitting end is determined according to the acquired environment information of the environment where the wireless channel between the transmitting end and the receiving end in the millimeter wave system is located.
Optionally, transmitting a precoding matrix VtThe transmitting terminal determines the transmitting correlation array according to the acquired environment information and determines the transmitting correlation array according to the determined transmitting correlation array;
where H is the channel matrix of the wireless channel between the transmitting end and the receiving endHThe representation is subjected to conjugate transpose, and the representation takes the expected value.
Optionally, transmitting a precoding matrix VtIs determined by the transmitting end according to a formulatIs a diagonal matrix.
Optionally, the millimeter wave signal is a precoding matrix V according to the transmission by the transmitting endtAnd each number contained in the millimeter wave signalDetermining after processing the transmitting signal according to the power distribution coefficient of the stream;
the power distribution coefficient of each data stream contained in the millimeter wave signal is determined by the transmitting end according to the acquired environment information.
Optionally, the power distribution coefficient of each data stream included in the millimeter wave signal is determined by the transmitting end according to the obtained environment information, determining the transmission correlation array according to the determined transmission correlation array;
where H is the channel matrix of the wireless channel between the transmitting end and the receiving endHThe representation is subjected to conjugate transpose, and the representation takes the expected value.
Optionally, the power distribution coefficient of each data stream included in the millimeter wave signal is obtained by the transmitting end according to a formulatAccording to the obtained diagonal matrix LambdatIs determined by the elements on the diagonal of (a).
Optionally, the transmission correlation array is determined by the transmitting end according to the obtained environment information, and the transmission parameters of the millimeter wave signals are determined according to the determined transmission parameters of the electromagnetic waves.
Optionally, the electromagnetic wave transmission parameters include at least one of the following parameters:
the depth of absorption;
the scattering depth;
an optical depth;
anisotropy is observed.
Optionally, the environment information includes: rainfall intensity information.
Optionally, the environment information further includes: ambient temperature information.
To sum up, the embodiments of the present invention provide a signal transmission apparatus and method, wherein a transmitting end determines a transmitting precoding matrix V according to acquired environment informationtThe influence of environmental factors on the transmitting precoding matrix is considered, and the system performance can be effectively improved.
Such as: in a rainfall environment, rainfall causes strong scattering of millimeter wave signals, and the scattering reduces correlation between transmitting-end antennas in a millimeter wave system as a MIMO system and reduces correlation between receiving-end antennas. The reduction in correlation between antennas will give the millimeter wave system an opportunity to gain multiplexing gain.
Rainfall may be HHThe characteristic values of H tend to be the same, and the number of potential sub-channels available for data transmission is increased, so that the potential multiplexing gain can be used for compensating the large-scale fading caused by rainfall on the premise of not increasing the transmission power.
If the rainfall intensity R meets the condition that R is more than 0 and less than or equal to 20 mm/h, the multiplexing gain is even larger than the large-scale fading caused by rainfall, so that the channel capacity larger than that in the non-rainfall environment can be obtained by utilizing the multiplexing gain.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (40)

  1. A signal transmitting apparatus in a transmitting end in a millimeter wave system, comprising:
    the processing unit is used for acquiring environment information of an environment where a wireless channel between the transmitting end and the receiving end is located in the millimeter wave system; determining a transmitting pre-coding matrix V according to the acquired environment informationt(ii) a According to the determined transmission precoding matrix VtProcessing the transmitting signal;
    and the transmitting unit is used for transmitting the millimeter wave signal obtained after the processing of the processing unit to the receiving end.
  2. The apparatus as claimed in claim 1, wherein said processing unit is specifically configured to:
    determining a transmission correlation array according to the acquired environment information, wherein H is a channel matrix of a wireless channel between the transmitting end and the receiving endHPerforming conjugate transposition to express an expected value;
    determining the transmission pre-coding matrix V according to the determined transmission correlation matrixt。
  3. The apparatus as claimed in claim 2, wherein said processing unit is specifically configured to:
    determining the transmit precoding matrix V according to a formulatA saidtIs a diagonal matrix.
  4. The apparatus of claim 1,
    the processing unit is further to: after the environment information is acquired and before the emission signal processing is performed, determining a power distribution coefficient of each data stream contained in the millimeter wave signal according to the acquired environment information;
    the processing unit is specifically configured to:
    according to the determined transmission precoding matrix VtAnd the determined power distribution coefficient of each data stream contained in the millimeter wave signal, and processing the transmitting signal.
  5. The apparatus as claimed in claim 4, wherein said processing unit is specifically configured to:
    determining a transmission correlation array according to the acquired environment information, wherein H is a channel matrix of a wireless channel between the transmitting end and the receiving endHPerforming conjugate transposition to express an expected value;
    and determining the power distribution coefficient of each data stream contained in the millimeter wave signal according to the determined transmitting correlation array.
  6. The apparatus as claimed in claim 5, wherein said processing unit is specifically configured to:
    obtaining diagonal matrix Lambda according to a formulat；
    According to diagonal matrix ΛtAnd elements on the diagonal line determine the power distribution coefficient of each data stream contained in the millimeter wave signal.
  7. The apparatus of claim 2, 3, 5, or 6, wherein the processing unit is specifically configured to:
    determining an electromagnetic wave propagation parameter of the millimeter wave signal according to the acquired environment information;
    determining the emission correlation array according to the determined electromagnetic wave transmission parameters
  8. The apparatus of claim 7, wherein the electromagnetic wave transmission parameters comprise at least one of:
    the depth of absorption;
    the scattering depth;
    an optical depth;
    anisotropy is observed.
  9. The apparatus of any of claims 1-8, wherein the environmental information comprises: rainfall intensity information.
  10. The apparatus of claim 9, wherein the context information further comprises: ambient temperature information.
  11. A signal receiving apparatus in a receiving end in a millimeter wave system, comprising:
    the receiving unit is used for receiving the millimeter wave signal transmitted by the transmitting terminal in the millimeter wave system;
    the processing unit is used for demodulating the millimeter wave signal received by the receiving unit to obtain a demodulated signal;
    wherein the millimeter wave signal is the transmitting end rootAccording to the transmitting precoding matrix VtThe signal is obtained after the emission signal processing is carried out;
    the transmission precoding matrix VtThe transmitting end is determined according to the acquired environment information of the environment where the wireless channel between the transmitting end and the receiving end is located in the millimeter wave system.
  12. The apparatus of claim 11, wherein the transmit precoding matrix VtThe transmitting terminal determines a transmitting correlation array according to the acquired environment information and determines the transmitting correlation array according to the determined transmitting correlation array;
    wherein H is a channel matrix of a wireless channel between the transmitting end and the receiving end, ()HThe representation is subjected to conjugate transpose, and the representation takes the expected value.
  13. The apparatus of claim 12, wherein the transmit precoding matrix VtIs determined by the transmitting terminal according to a formula, the ΛtIs a diagonal matrix.
  14. The apparatus of claim 11, wherein the millimeter wave signals are based on the transmit precoding matrix V by the transmit endtAnd the power distribution coefficient of each data stream contained in the millimeter wave signal is determined after the transmission signal processing is carried out;
    and the power distribution coefficient of each data stream contained in the millimeter wave signal is determined by the transmitting terminal according to the acquired environment information.
  15. The apparatus according to claim 14, wherein the power distribution coefficient of each data stream included in the millimeter wave signal is determined by the transmitting end determining a transmission correlation array according to the acquired environment information, and determining the transmission correlation array according to the determined transmission correlation array;
    wherein H is a channel matrix of a wireless channel between the transmitting end and the receiving end, ()HThe representation is subjected to conjugate transposition, and representation is takenThe expected value.
  16. The apparatus as claimed in claim 15, wherein the power distribution coefficient of each data stream included in the millimeter wave signal is a diagonal matrix Λ obtained by the transmitting end according to a formulatAccording to the obtained diagonal matrix LambdatIs determined by the elements on the diagonal of (a).
  17. The apparatus according to claim 12, 13, 15 or 16, wherein the transmission correlation array is determined by the transmitting end based on the acquired environment information to determine an electromagnetic wave propagation parameter of the millimeter wave signal, and based on the determined electromagnetic wave propagation parameter.
  18. The apparatus of claim 17, wherein the electromagnetic wave transmission parameters comprise at least one of:
    the depth of absorption;
    the scattering depth;
    an optical depth;
    anisotropy is observed.
  19. The apparatus of any of claims 11-18, wherein the environmental information comprises: rainfall intensity information.
  20. The apparatus of claim 19, wherein the context information further comprises: ambient temperature information.
  21. A method of transmitting a signal, comprising:
    the method comprises the steps that a transmitting end obtains environment information of an environment where a wireless channel between the transmitting end and a receiving end in a millimeter wave system is located;
    the transmitting terminal determines a transmitting precoding matrix V according to the acquired environment informationt；
    The transmitting terminal transmits a precoding matrix V according to the determined transmission precoding matrixtProcessing the transmitting signal;
    and the transmitting terminal transmits the millimeter wave signal obtained after the processing to the receiving terminal.
  22. The method of claim 21, wherein the transmitting end determines a transmit precoding matrix V according to the acquired environment informationtThe method comprises the following steps:
    the transmitting terminal determines a transmitting correlation array according to the acquired environment information, wherein H is a channel matrix of a wireless channel between the transmitting terminal and the receiving terminal, (.)HRepresenting to carry out conjugate transposition and representing to obtain an expected value;
    the transmitting terminal determines the transmitting pre-coding matrix V according to the determined transmitting correlation matrixt。
  23. The method of claim 22, wherein the transmitting end determines the transmit precoding matrix V according to the determined transmit correlation matrixtThe method comprises the following steps:
    the transmitting terminal determines the transmitting pre-coding matrix V according to a formulatA saidtIs a diagonal matrix.
  24. The method of claim 21,
    after the transmitting end acquires the environment information and before the transmitting signal processing, the method further comprises:
    the transmitting terminal determines the power distribution coefficient of each data stream contained in the millimeter wave signal according to the acquired environment information;
    the transmitting terminal transmits a precoding matrix V according to the determined transmission precoding matrixtAnd performing transmission signal processing, including:
    the transmitting terminal transmits a precoding matrix V according to the determined transmission precoding matrixtAnd the determined power distribution coefficient of each data stream contained in the millimeter wave signal, and processing the transmitting signal.
  25. The method of claim 24, wherein the determining, by the transmitting end, the power distribution coefficient of each data stream included in the millimeter wave signal according to the acquired environment information comprises:
    the transmitting terminal determines a transmitting correlation array according to the acquired environment information, wherein H is a channel matrix of a wireless channel between the transmitting terminal and the receiving terminal, (.)HPerforming conjugate transposition to express an expected value;
    and the transmitting end determines the power distribution coefficient of each data stream contained in the millimeter wave signal according to the determined transmitting correlation array.
  26. The method of claim 25, wherein the determining, by the transmitting end, the power distribution coefficient of each data stream included in the millimeter wave signal according to the determined transmit correlation array comprises:
    the transmitting terminal obtains a diagonal matrix Lambda according to a formulat；
    The transmitting terminal is based on the diagonal matrix lambdatAnd elements on the diagonal line determine the power distribution coefficient of each data stream contained in the millimeter wave signal.
  27. The method as claimed in claim 22, 23, 25 or 26, wherein said determining said transmit correlation array by said transmitting end based on said obtained environment information comprises:
    the transmitting terminal determines the electromagnetic wave propagation parameters of the millimeter wave signals according to the acquired environment information;
    the transmitting terminal determines the transmitting correlation array according to the determined electromagnetic wave transmission parameters
  28. The method of claim 27, wherein the electromagnetic wave transmission parameters include at least one of:
    the depth of absorption;
    the scattering depth;
    an optical depth;
    anisotropy is observed.
  29. The method of any of claims 21 to 28, wherein the environmental information comprises: rainfall intensity information.
  30. The method of claim 29, wherein the context information further comprises: ambient temperature information.
  31. A signal receiving method, comprising:
    the receiving end receives the millimeter wave signal transmitted by the transmitting end;
    the receiving end demodulates the received millimeter wave signal to obtain a demodulated signal;
    wherein the millimeter wave signal is transmitted by the transmitting end according to a transmission precoding matrix VtThe signal is obtained after the emission signal processing is carried out;
    the transmission precoding matrix VtThe transmitting end is determined according to the acquired environment information of the environment where the wireless channel between the transmitting end and the receiving end is located in the millimeter wave system.
  32. The method of claim 31, wherein the transmit precoding matrix VtThe transmitting terminal determines a transmitting correlation array according to the acquired environment information and determines the transmitting correlation array according to the determined transmitting correlation array;
    wherein H is a channel matrix of a wireless channel between the transmitting end and the receiving end, ()HThe representation is subjected to conjugate transpose, and the representation takes the expected value.
  33. The method of claim 32, wherein the transmit precoding matrix VtIs determined by the transmitting terminal according to a formula, the ΛtIs a diagonal matrix.
  34. The method of claim 31, wherein the mmwave signals are based on the transmit precoding matrix V by the transmit endtAnd anThe power distribution coefficient of each data stream contained in the millimeter wave signal is determined after the transmission signal processing is carried out;
    and the power distribution coefficient of each data stream contained in the millimeter wave signal is determined by the transmitting terminal according to the acquired environment information.
  35. The method according to claim 34, wherein the power distribution coefficient of each data stream included in the millimeter wave signal is determined by the transmitting end determining a transmission correlation array according to the acquired environment information, and determining the transmission correlation array according to the determined transmission correlation array;
    wherein H is a channel matrix of a wireless channel between the transmitting end and the receiving end, ()HThe representation is subjected to conjugate transpose, and the representation takes the expected value.
  36. The method as claimed in claim 35, wherein the power distribution coefficient of each data stream included in the millimeter wave signal is a diagonal matrix Λ obtained by the transmitting terminal according to a formulatAccording to the obtained diagonal matrix LambdatIs determined by the elements on the diagonal of (a).
  37. The method as claimed in claim 32, 33, 35 or 36, wherein the transmit correlation array is determined by the transmitting end based on the acquired environment information to determine the electromagnetic wave propagation parameters of the millimeter wave signals, and based on the determined electromagnetic wave propagation parameters.
  38. The method of claim 37, wherein the electromagnetic wave transmission parameters include at least one of:
    the depth of absorption;
    the scattering depth;
    an optical depth;
    anisotropy is observed.
  39. The method of any one of claims 31 to 38, wherein the environmental information comprises: rainfall intensity information.
  40. The method of claim 39, wherein the context information further comprises: ambient temperature information.
CN201480060090.1A 2014-12-29 2014-12-29 Signal transmission device and method Pending CN105934989A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112201032A (en) * 2020-08-28 2021-01-08 武汉理工大学 Road traffic flow monitoring method, storage medium and system

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101252418A (en) * 2008-04-01 2008-08-27 东南大学 Self-adapting transmitting method using channel statistical information in multi-aerial transmission system
US20090122889A1 (en) * 2007-11-09 2009-05-14 Samsung Electronics Co., Ltd. Method and apparatus for decomposing channel in closed-loop multiple input multiple output communication system
CN101895911A (en) * 2010-07-23 2010-11-24 东南大学 Self-adaption transmission method utilizing channel statistical information in multi-base station cooperative transmission system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090122889A1 (en) * 2007-11-09 2009-05-14 Samsung Electronics Co., Ltd. Method and apparatus for decomposing channel in closed-loop multiple input multiple output communication system
CN101252418A (en) * 2008-04-01 2008-08-27 东南大学 Self-adapting transmitting method using channel statistical information in multi-aerial transmission system
CN101895911A (en) * 2010-07-23 2010-11-24 东南大学 Self-adaption transmission method utilizing channel statistical information in multi-base station cooperative transmission system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112201032A (en) * 2020-08-28 2021-01-08 武汉理工大学 Road traffic flow monitoring method, storage medium and system

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