WO2018119943A1

WO2018119943A1 - Channel identification method and device

Info

Publication number: WO2018119943A1
Application number: PCT/CN2016/113246
Authority: WO
Inventors: 李明; 遆光宇
Original assignee: 深圳天珑无线科技有限公司
Priority date: 2016-12-29
Filing date: 2016-12-29
Publication date: 2018-07-05

Abstract

Provided in the embodiment of the present application are a channel identification method and device. In one aspect, in the embodiment of the present application, receiving a signal on a first system frequency band; generating a joint matrix comprising a channel parameter and a spreading code according to the signal received from the first system frequency band and a transmission signal matrix; obtaining a target matrix according to the joint matrix; and according to the target matrix, obtaining a spreading code used by the first system, the spreading code being used to identify the channel occupied by the first system. Therefore, the technical solution provided by the embodiments of the present application can identify the occupied channel in the communication system without performing additional communication.

Description

Channel identification method and device

Technical field

The present application relates to the field of communications technologies, and in particular, to a channel identification method and apparatus.

Background technique

With the deepening of informatization, the amount of data in wireless communication has exploded, and the existing spectrum resources are becoming more and more tense. The method of resource allocation by using fixed frequency band division method can effectively allocate resources for different types of communication systems and users and avoid conflicts. However, in many divided frequency bands, the allocated spectrum resources have not been fully utilized. In most cases, the frequency band utilization of the static spectrum partitioning method is less than 10%. How to improve the utilization rate of existing spectrum resources is a technical problem that needs to be solved in the direction of improving communication efficiency.

Code Division Multiple Access (CDMA) is a wireless access technology widely used in the prior art. It is easy to implement due to its anti-interference, anti-fading, large capacity, soft handover and anti-spectrum analysis. In recent years, code division multiple access has been increasingly favored. In code division multiple access, the allocation of communication resources is realized by the allocation of spreading codes, and each user occupies a separate spreading code for establishing communication with the base station, in the code division multiple access downlink, The user's spreading code is orthogonal or nearly orthogonal, so that when receiving at the receiving end, the receiving end can effectively recover the transmitted signal as long as it knows the unique spreading code assigned.

At present, only when there are unoccupied channels in the current communication system, the unoccupied channels can be further utilized, thereby improving the utilization of spectrum resources in the communication system, thereby effectively identifying the occupied channels in the communication system. The channel is very necessary.

Summary of the invention

In view of this, the embodiment of the present application provides a channel identification method and apparatus, which can identify a channel already occupied in a communication system without performing additional communication.

In one aspect, the embodiment of the present application provides a channel identification method, which is applied to a communication system including a first system and a second system, where the first system includes a first receiving end and a first transmitting end, and the second system package The second receiving end and the second sending end are included; the method is performed on the second sending end, and includes:

Receiving a signal on a first system frequency band;

Generating a joint matrix including a channel parameter and a spreading code according to a signal received from the first system band and a transmission signal matrix;

Obtaining a target matrix according to the joint matrix;

Obtaining a spreading code used by the first system according to the target matrix.

The aspect as described above and any possible implementation manner further provide an implementation manner, according to the joint matrix, obtaining a target matrix, including:

Obtaining a new transmit signal matrix according to the signal received from the first system frequency band and the joint matrix;

Obtaining a new joint matrix based on the signal received from the first system band and the new transmitted signal matrix;

Obtaining a new transmission signal matrix again according to the signal received from the first system frequency band and the new joint matrix;

And so on;

Obtaining a signal vector satisfying the specified condition in the latest joint matrix when the latest joint matrix is the same as the previous joint matrix;

Obtaining a target transmission signal matrix according to the signal received from the first system frequency band and the signal vector;

A target joint matrix is obtained based on a signal received from the first system band and the target transmit signal matrix.

And the foregoing aspect, and any possible implementation manner, further providing an implementation, according to the signal received from the first system frequency band and the joint matrix, and using the following formula, to obtain a new transmission Signal matrix:

B=sgn{Re[(V ^H V) ^-1 V ^H Y]}

Where B is the new transmit signal matrix, V is the joint matrix, and Y is received on the first system band. The signal, H, indicates conjugate transposition.

The aspect as described above, and any possible implementation manner, further provide an implementation manner, according to the target matrix, obtaining a spreading code used by the first system, including:

Obtaining new channel parameters according to the target matrix and the spreading code;

Obtaining a new spreading code according to the target matrix and the new channel parameter;

Obtaining new channel parameters again according to the target matrix and the new spreading code;

And so on;

When the latest spreading code is the same as the previous spreading code, it is determined that the latest spreading code is a spreading code used by the first system.

The aspect and any possible implementation manners described above further provide an implementation manner, according to the target matrix and the new channel parameter, and using the following formula to obtain a new spreading code:

Where s _i is the _ith spreading code in the new spreading code, L is the spreading code length, E is the channel parameter matrix, v _i is the target matrix vector in the target matrix, and H is the conjugate transpose.

On the other hand, the embodiment of the present application provides a channel identification apparatus, which is applied to a communication system including a first system and a second system, where the first system includes a first receiving end and a first transmitting end, and the second system includes a second system. a receiving end and a second sending end; the device is located on the second sending end, and includes:

a receiving unit, configured to receive a signal on a first system frequency band;

a generating unit, configured to generate a joint matrix including a channel parameter and a spreading code according to the signal received from the first system band and the transmission signal matrix;

a first acquiring unit, configured to obtain a target matrix according to the joint matrix;

And a second acquiring unit, configured to obtain, according to the target matrix, a spreading code used by the first system.

The above-mentioned aspect and any possible implementation manner further provide an implementation manner, where the first acquiring unit is configured to:

And so on;

The above-mentioned aspect and any possible implementation manner further provide an implementation manner, where the first acquiring unit is specifically configured to:

A new transmit signal matrix is obtained based on the signal received from the first system band and the joint matrix, and using the following formula:

B=sgn{Re[(V ^H V) ^-1 V ^H Y]}

Where B is a new transmission signal matrix, V is a joint matrix, Y is a signal received on the first system band, and H is a conjugate transpose.

The above-mentioned aspect and any possible implementation manner further provide an implementation manner, where the second obtaining unit is configured to:

And so on;

The above-mentioned aspect and any possible implementation manner further provide an implementation manner, where the second obtaining unit is specifically configured to:

Obtaining a new spreading code according to the target matrix and the new channel parameter, and using the following formula:

One of the above technical solutions has the following beneficial effects:

The channel identification method provided by the embodiment of the present application is applied to a communication system including a first system and a second system, where the first system includes a first receiving end and a first transmitting end, and the second system includes a second receiving end and a second sending The method is performed on the second transmitting end, specifically, by receiving a signal on the first system frequency band, and then generating a channel parameter and a spread spectrum according to the received signal matrix and the transmitted signal matrix from the first system frequency band The joint matrix of the code, and thus, obtains the target matrix according to the joint matrix, and further, according to the target matrix, obtains a spreading code used by the first system, and the spreading code is used to identify the channel occupied by the first system. In the embodiment of the present application, it is considered that the signals on the first system frequency band are all communicated through the occupied channels in the communication system, and each channel corresponds to an independent spreading code. Therefore, the present application implements In an example, the second sending end in the second system does not need to perform additional communication with the first receiving end or the first sending end in the first system regarding the channel occupancy condition, and the second sending end only needs to receive the original The signal on the first system frequency band is analyzed, and the spreading code used by the first system can be determined, so that the channel occupancy of the communication system can be dynamically perceived, and thus, conditions for improving the frequency band utilization of the communication system can be created. . Therefore, the technical solution provided by the embodiment of the present application can identify a channel that has been occupied in the communication system without performing additional communication.

DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings used in the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the present application. In the field of ordinary technicians, without premise of creative labor Further drawings can also be obtained from these figures.

1 is a schematic diagram of a communication system in an embodiment of the present application;

2 is a schematic flowchart of Embodiment 1 of a channel identification method provided by an embodiment of the present application;

3 is a schematic flowchart of Embodiment 2 of a channel identification method provided by an embodiment of the present application;

FIG. 4 is a functional block diagram of a channel identification apparatus according to an embodiment of the present application.

detailed description

For a better understanding of the technical solutions of the present application, the embodiments of the present application are described in detail below with reference to the accompanying drawings.

It should be understood that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present application without departing from the inventive scope are the scope of the present application.

The terms used in the embodiments of the present application are for the purpose of describing particular embodiments only, and are not intended to limit the application. The singular forms "a", "the", and "the"

It should be understood that the term "and/or" as used herein is merely an association describing the associated object, indicating that there may be three relationships, for example, A and/or B, which may indicate that A exists separately, while A and B, there are three cases of B alone. In addition, the character "/" in this article generally indicates that the contextual object is an "or" relationship.

It should be understood that although the terms first, second, third, etc. may be used to describe a system or the like in the embodiments of the present application, these systems and the like should not be limited to these terms. These terms are only used to distinguish systems from each other. For example, the first system may also be referred to as a second system without departing from the scope of the embodiments of the present application. Similarly, the second system may also be referred to as a first system.

Depending on the context, the word "if" as used herein may be interpreted as "when" or "when" or "in response to determining" or "in response to detecting." Similarly, depending on the context, the phrase "if determined" or "if detected (conditions or events stated)" can be interpreted as "when determined" or "ringing" It should be determined "or" when detecting (conditions or events stated) or "in response to testing (conditions or events stated)".

Embodiment 1

The embodiment of the present application provides a channel identification method. The method is applied to a communication system including a first system and a second system, wherein the first system includes a first receiving end and a first transmitting end, and the second system includes a second receiving end and a second transmitting end.

Specifically, please refer to FIG. 1 , which is a schematic diagram of a communication system in an embodiment of the present application. As shown in FIG. 1, the system includes a first system and a second system, where the first system includes one first transmitting end and K first receiving ends, and the second system includes one second transmitting end and one second system. The second receiving end of the communication system to be accessed.

In the communication system shown in FIG. 1, the signal sent by the first transmitting end can be received by the first receiving end and the second receiving end in the communication system, which is indicated by a solid line in FIG. 1; the signal sent by the second transmitting end is shown in FIG. It can be received by the first receiving end and the second receiving end in the communication system, and is indicated by a broken line in FIG.

In the communication system shown in FIG. 1, in the first system, the K first receiving ends have established communication with the first transmitting end, that is, the first transmitting end allocates K devices to the K first receiving ends. The spreading code is not limited in this embodiment. The number of Ks is at least one.

In the communication system shown in FIG. 1, one second receiving end is a receiving end of a channel to be accessed, and at this time, the second receiving ends are not connected to the communication system; wherein the number of Is may be one or more One.

In a specific implementation process, the first system may be the primary system and the second system may be the secondary system.

In another specific implementation, the communication system including the first system and the second system may be a code division multiple access communication system.

It can be understood that, in the communication system shown in FIG. 1, if the second transmitting end does not perform additional communication with the first transmitting end or the first receiving end in the first system for additional channel occupation, the second The sender cannot know the channel occupancy in the first system.

The channel identification method provided by the embodiment of the present application determines the channel occupied by the first system by performing blind analysis on the received signal in the first system frequency band.

Based on the above concept, please refer to FIG. 2 , which is a schematic flowchart of Embodiment 1 of a channel identification method according to an embodiment of the present application. As shown in FIG. 2 , the method includes the following steps:

S201. Receive a signal on a first system frequency band.

S202. Generate a joint matrix including a channel parameter and a spreading code according to the signal received from the first system band and the transmission signal matrix.

S203. Obtain a target matrix according to the joint matrix.

S204. Obtain a spreading code used by the first system according to the target matrix.

The spreading code is used to identify a channel occupied by the first system.

It should be noted that the execution body of S201-S204 may be a channel identification device, and the device may be located at a second transmitting end in the communication system.

The technical solution of the embodiment of the present application has the following beneficial effects:

In the embodiment of the present application, it is considered that the signals on the first system frequency band are all communicated through the occupied channels in the communication system, and each channel corresponds to an independent spreading code. Therefore, the present application implements In an example, the second sending end in the second system does not need to perform additional communication with the first receiving end or the first sending end in the first system regarding the channel occupancy condition, and the second sending end only needs to receive the original The signal on the first system frequency band is analyzed, and the spreading code used by the first system can be determined, so that the channel occupancy of the communication system can be dynamically perceived, and thus, conditions for improving the frequency band utilization of the communication system can be created. . Therefore, the technical solution provided by the embodiment of the present application can identify a channel that has been occupied in the communication system without performing additional communication.

Embodiment 2

Based on the channel identification method provided in the first embodiment, the method in the present application specifically describes the method for obtaining a target matrix according to the joint matrix in S203.

Specifically, the received signal on the first system frequency band can be expressed as:

Where y(m) represents the signal on the first system frequency band received in the mth time slot, D _i represents the transmission power allocated by the first transmitting end to the ith first receiving end, and b _i (m) represents the first m timeslots are sent to the ith first receiving end, s _i is the spreading code corresponding to the ith first receiving end, n is Gaussian white noise, and E is a multipath channel matrix, where E can be expressed as The following form:

As such, a plurality of signals received from the first system band may constitute a signal matrix, and thus, the signal matrix received from the first system band may be expressed as:

Y=VB+N

Wherein Y is a received signal matrix composed of a plurality of signals received from the first system frequency band, B is a transmission signal matrix composed of a plurality of b _i (m), N is a Gaussian white noise, and V is a generated joint matrix. .

It should be noted that the generated joint matrix V includes channel parameters and spreading codes. Specifically, the ith column vector in the joint matrix V can be expressed as:

Based on this, the least squares iterative method can be used to obtain the target matrix according to the joint matrix described above. Specifically, the method for obtaining the target matrix may include the following steps:

Obtaining a new transmit signal matrix according to the signal received from the first system band and the joint matrix;

Obtaining a new transmit signal matrix again based on the signal received from the first system band and the new joint matrix;

And so on;

Obtaining a signal vector satisfying a specified condition in the latest joint matrix when the latest joint matrix is identical to the previous joint matrix;

A target joint matrix is obtained based on the signal received from the first system band and the target transmission signal matrix.

Therefore, in the actual implementation process, the transmission signal matrix B can be arbitrarily initialized, where B ∈ {±1} ^{K × N} . Then, using the least squares iteration principle, the received signal matrix Y and the initialized transmitted signal matrix B are used to calculate the joint matrix V at this time, and at this time, V=YB ^T (BB ^T ) ⁻¹ .

After that, the least-squares iteration principle can be utilized to obtain a new transmission signal matrix B by using the received signal matrix Y and the joint matrix V. At this time, B=sgn{Re[(V ^H V) ^-1 V ^H Y]} . Where B is a new transmission signal matrix, V is a joint matrix, Y is a signal matrix received on the first system band, and H is a conjugate transpose.

After acquiring the new transmission signal matrix, the new joint matrix V is obtained by using the least squares iteration principle, using the received signal matrix Y and the new transmission signal matrix B.

After acquiring the new new joint matrix V, again using the least squares iteration principle, using the received signal matrix Y and the new joint matrix V, a new transmitted signal matrix B is obtained again.

After that, the above steps are repeated, and so on, until the convergence stops the above steps, that is, until the latest joint matrix obtained is the same as the joint matrix obtained last time, the convergence is considered, and at this time, the above steps are not repeated. The convergence results include the latest joint matrix V and the latest transmit signal matrix B.

In the embodiment of the present application, it is also considered that the obtained convergence result is not necessarily globally optimal. To this end, the correlation determination is introduced to obtain a stable signal vector satisfying the specified correlation condition in the joint matrix V. .

It should be noted that, before this, firstly, whether the transmission signal matrix B is reliable or not is determined. When it is determined that the transmission signal matrix B is reliable, the step of acquiring a stable signal vector in the joint matrix V is performed. Alternatively, when it is determined that the transmission signal matrix B is unreliable, the initialization transmission signal matrix B is re-executed, and finally the convergence result is obtained until a stable transmission signal matrix B is obtained.

In a specific implementation process, since the transmission signal vectors of each column in the transmission signal matrix B should be independent of each other as much as possible, whether the obtained transmission signal matrix B is reliable or not, any two of the transmission signal matrices B can be obtained. The correlation of the column signal vectors. Therefore, when the correlation of any two columns of signal vectors in the transmission signal matrix B is greater than or equal to a preset first correlation threshold, it is considered that the obtained transmission signal matrix B is unreliable; or, when transmitting the signal matrix B When the correlation of any two columns of signal vectors is less than the preset first correlation threshold, the obtained transmission signal matrix B is considered to be reliable.

Specifically, the correlation of any two columns of signal vectors in the transmit signal matrix B can be obtained by using the following formula:

Where η _i,j is the correlation between the ith column signal vector b _i and the other column signal vectors in the transmission signal matrix B, and N is the number of the second receiving ends. In the actual application process, the first correlation threshold may be preset to

When it is determined that the newly obtained joint matrix V is reliable, in order to make the newly obtained joint matrix V more stable, it is also necessary to consider whether the initialization result of the transmission signal matrix B is stable at the beginning.

In general, in a stable joint matrix V, the higher the correlation between the vector signals, the higher the accuracy. Therefore, a reliable set of signal vectors can be obtained in the joint matrix V.

Then, this column of reliable signal vectors

The initialized transmit signal matrix B is regenerated, and then processed by the least squares iteration method to obtain the final reliable joint matrix V. It can be understood that the finally obtained joint matrix V obtained at this time is obtained according to the stable initialization result. Therefore, the interference caused by the instability of the initialization result is excluded, and the resultant joint matrix V is reliable.

In a specific implementation process, a reliable set of signal vectors is obtained in the joint matrix V.

The correlation between any one of the signal vectors of the joint matrix V and the other column signal vectors can be obtained, and then these signal vectors are respectively compared with a preset second correlation threshold, when there is a column of signal vectors and other signal vectors. This signal vector is considered to be reliable when the correlation is greater than or equal to the preset second correlation threshold.

Specifically, the correlation between the signal vector of any one of the transmission joint matrices V and the other column signal vectors can be obtained by using the following formula:

among them,

Is the signal vector of the ith column in the joint matrix V

Correlation with other signal vectors, F is the number of times the above steps are performed until convergence.

In the actual application process, the second correlation threshold may be preset as an average of the correlations of all signal vectors in the joint matrix V. At this time, the second correlation threshold may be preset as:

When the i-th column signal vector

Correlation with other signal vectors

Greater than or equal to the average of all signal vectors

I think the ith column signal vector

It is reliable.

Embodiment 3

Based on the channel identification method provided in the first embodiment, the method in the present application specifically describes the method for obtaining the spreading code used by the first system according to the target matrix in S204.

Specifically, the obtained i-th column signal vector in the target matrix V can be expressed as:

The target matrix includes a spreading code and a signal parameter. In a specific implementation process, the spreading code used by the first system can be obtained in a similar manner to the second embodiment.

In a specific implementation process, using the least squares iteration method, according to the obtained target matrix, The step of obtaining the spreading code used by the first system may include:

Obtaining a new spreading code according to the target matrix and the new channel parameters;

And so on;

When the latest spreading code is the same as the previous spreading code, it is determined that the latest spreading code is the spreading code used by the first system.

Therefore, the spreading code S=[s _i ] can be arbitrarily initialized first, where i=1, 2...k. s _i is a spreading code corresponding to the ith first receiving end. In the implementation process, s _i can be expressed as a column vector, and S can be expressed as a matrix of spreading codes including a plurality of spreading code column vectors.

Then, using the principle of least squares iteration, a new channel parameter matrix E is obtained according to the obtained target matrix V and the initialized spreading code matrix S. At this time, any channel parameter vector in the new channel parameter matrix E can be expressed as :

Where e is any channel parameter vector in the new channel parameter matrix E, K is the number of first receiving ends in the first system, v _i is the ith signal vector in the target matrix V, and s _i is the spreading code S The spreading code corresponding to the i th first receiving end, at this time, s _i can be expressed as:

Wherein, L indicates that the number of spreading codes corresponding to the i-th first receiving end obtained by the above-mentioned L steps is L.

Then, using the principle of least squares iteration, a new spreading code S is obtained according to the obtained target matrix V and the new channel parameter matrix E. At this time, the i-th first receiving end of the new spreading code S corresponds to The spreading code s _i can be expressed as:

Where s _i is the spreading code corresponding to the i th first receiving end in the new spreading code, L is the spreading code length, E is the channel parameter matrix, v _i is the target matrix vector in the target matrix, and H is Conjugate transposition.

After that, the above steps are repeated, and so on, until the convergence stops the above steps, that is, until the obtained latest spreading code matrix is the same as the last obtained spreading code matrix, it is considered to be converged, and at this time, the above is not repeated. In the step, the obtained convergence result includes the latest spreading code matrix S and the channel parameter matrix E.

Thus, the spreading code matrix S is obtained, and all the spreading code information used in the first system is obtained, and since the obtained joint matrix V is reliable, the spreading code matrix obtained by the least squares iterative principle is obtained. S is also reliable.

Embodiment 4

Based on the channel identification method provided in the first embodiment, a specific implementation method of the foregoing channel identification method is provided in the embodiment of the present application.

Specifically, please refer to FIG. 3 , which is a schematic flowchart of Embodiment 2 of acquiring a spreading code used in the first system in the embodiment of the present application. As shown in FIG. 3, the method includes the following steps:

S301. Receive a signal on a first system frequency band.

S302, arbitrarily initialize the transmission signal matrix.

S303. Use a minimum according to the received signal and the signal matrix on the first system frequency band. The two-time iteration method obtains a new joint matrix.

S304. Obtain a new transmit signal matrix by using a least squares iteration method according to the received signal on the first system frequency band and the new joint matrix.

S305, determining whether to converge; if yes, executing S306; if not, executing S303.

S306, determining whether the obtained transmission signal matrix is reliable; if yes, executing S307; if not, executing S302.

S307. Filter out a list of signal vectors satisfying the specified condition in the obtained joint matrix.

S308. Obtain a target transmission signal matrix according to the received signal on the first system frequency band and the column signal vector.

S309. Obtain a target joint matrix according to the received signal on the first system frequency band and the target transmission signal matrix.

S310, arbitrarily initialize the spreading code matrix.

S311: Obtain a new channel parameter matrix by using a least squares iteration method according to the obtained target joint matrix and the spreading code matrix.

S312. Obtain a new spreading code matrix by using a least squares iteration method according to the obtained target joint matrix and the new channel parameter matrix.

S313, determining whether to converge; if yes, executing S314; if not, executing S311.

S314. Determine a spreading code in the converged spreading code matrix as a spreading code used by the first system.

In the embodiment of the present application, it is considered that the signals on the first system frequency band are all communicated through the occupied channels in the communication system, and each channel corresponds to an independent spreading code. Therefore, the present application implements In an example, the second sending end in the second system does not need to perform additional communication with the first receiving end or the first sending end in the first system regarding the channel occupancy condition, and the second sending end only needs to receive the original The signal on the first system frequency band is analyzed, and the spreading code used by the first system can be determined, so that the channel occupancy of the communication system can be dynamically perceived, and thus, conditions for improving the frequency band utilization of the communication system can be created. . Therefore, the technical solution provided by the embodiment of the present application can Identify the channels already occupied in the communication system on the premise of additional communication.

Embodiment 5

Based on the channel identification method provided in the first embodiment, the embodiment of the present application further provides an apparatus embodiment for implementing the steps and methods in the foregoing method embodiments.

The embodiment of the present application provides a channel identification apparatus, which is applied to a communication system including a first system and a second system, where the first system includes a first receiving end and a first transmitting end, and the second system includes a communication system to be accessed. a second receiving end and a second transmitting end; the device is located on the second transmitting end.

Specifically, please refer to FIG. 4 , which is a functional block diagram of a channel identification apparatus according to an embodiment of the present application. As shown in Figure 4, the device comprises:

a receiving unit 41, configured to receive a signal on a first system frequency band;

The generating module 42 is configured to generate a joint matrix including a channel parameter and a spreading code according to the signal received from the first system band and the transmission signal matrix;

The first obtaining unit 43 is configured to obtain a target matrix according to the joint matrix;

The second obtaining unit 44 is configured to obtain a spreading code used by the first system according to the target matrix.

The first obtaining unit 43 is configured to:

And so on;

Obtaining the target joint based on the signal received from the first system band and the target transmission signal matrix matrix.

In a specific implementation process, the first obtaining unit 43 is specifically configured to:

According to the signal received from the first system band and the joint matrix, and using the following formula, a new transmission signal matrix is obtained:

B=sgn{Re[(V ^H V) ^-1 V ^H Y]}

The second obtaining unit 44 is configured to:

And so on;

In a specific implementation process, the second obtaining unit 44 is specifically configured to:

According to the target matrix and the new channel parameters, and using the following formula, a new spreading code is obtained:

Since the units in this embodiment can perform the method shown in FIG. 2, and the parts not described in detail in this embodiment, reference may be made to the related description of FIG. 2.

In the embodiment of the present application, it is considered that the signals on the first system frequency band are all communicated through the occupied channels in the communication system, and each channel corresponds to an independent spreading code. Therefore, the present application implements In an example, the second sending end in the second system does not need to perform additional communication with the first receiving end or the first sending end in the first system regarding the channel occupation situation, and the second transmitting end only needs to be the original The signal received in the first system frequency band is analyzed, and the spreading code used by the first system can be determined, so that the channel occupancy of the communication system can be dynamically perceived, and further, the frequency band utilization of the communication system can be improved. Rate creates conditions. Therefore, the technical solution provided by the embodiment of the present application can identify a channel that has been occupied in the communication system without performing additional communication.

A person skilled in the art can clearly understand that for the convenience and brevity of the description, the specific working process of the system, the device and the unit described above can refer to the corresponding process in the foregoing method embodiment, and details are not described herein again.

In the several embodiments provided by the present application, it should be understood that the disclosed system, apparatus, and method may be implemented in other manners. For example, the device embodiments described above are merely illustrative. For example, the division of the unit is only a logical function division. In actual implementation, there may be another division manner. For example, multiple units or components may be combined. Or it can be integrated into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in an electrical, mechanical or other form.

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, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.

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

The above-described integrated unit implemented in the form of a software functional unit can be stored in a computer readable storage medium. The software functional unit is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor to perform the methods of the various embodiments of the present application. Part of the steps. And the foregoing The storage medium includes: a USB flash drive, a removable hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like, which can store program codes.

The above is only the preferred embodiment of the present application, and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc., which are made within the spirit and principles of the present application, should be included in the present application. Within the scope of protection.

Claims

A channel identification method, which is applied to a communication system including a first system and a second system, the first system includes a first receiving end and a first transmitting end, and the second system includes a second receiving end and a second sending The method is performed on the second sending end, and includes:

Receiving a signal on a first system frequency band;

Generating a joint matrix including a channel parameter and a spreading code according to a signal received from the first system band and a transmission signal matrix;

Obtaining a target matrix according to the joint matrix;

And obtaining, according to the target matrix, a spreading code used by the first system, where the spreading code is used to identify a channel occupied by the first system.
The method according to claim 1, wherein the target matrix is obtained according to the joint matrix, comprising:

Obtaining a new transmit signal matrix according to the signal received from the first system frequency band and the joint matrix;

Obtaining a new joint matrix based on the signal received from the first system band and the new transmitted signal matrix;

Obtaining a new transmission signal matrix again according to the signal received from the first system frequency band and the new joint matrix;

And so on;

Obtaining a signal vector satisfying the specified condition in the latest joint matrix when the latest joint matrix is the same as the previous joint matrix;

Obtaining a target transmission signal matrix according to the signal received from the first system frequency band and the signal vector;

A target joint matrix is obtained based on a signal received from the first system band and the target transmit signal matrix.
The method according to claim 2, wherein a new transmission signal matrix is obtained based on the signal received from the first system band and the joint matrix, and using the following formula:

B=sgn{Re[(V H V) -1 V H Y]}

Where B is a new transmission signal matrix, V is a joint matrix, Y is a signal received on the first system band, and H is a conjugate transpose.
The method according to claim 1, wherein the spreading code used by the first system is obtained according to the target matrix, comprising:

Obtaining new channel parameters according to the target matrix and the spreading code;

Obtaining a new spreading code according to the target matrix and the new channel parameter;

Obtaining new channel parameters again according to the target matrix and the new spreading code;

And so on;

When the latest spreading code is the same as the previous spreading code, it is determined that the latest spreading code is a spreading code used by the first system.
The method according to claim 4, wherein a new spreading code is obtained according to the target matrix and the new channel parameter, and using the following formula:

Where s i is the spreading code corresponding to the i th first receiving end in the new spreading code, L is the spreading code length, E is the channel parameter matrix, v i is the target matrix vector in the target matrix, and H is Conjugate transposition.
A channel identification apparatus is applied to a communication system including a first system and a second system, the first system includes a first receiving end and a first transmitting end, and the second system includes a second receiving end and a second sending The device is located on the second sending end, and includes:

a receiving unit, configured to receive a signal on a first system frequency band;

a generating unit, configured to generate a joint matrix including a channel parameter and a spreading code according to the signal received from the first system band and the transmission signal matrix;

a first acquiring unit, configured to obtain a target matrix according to the joint matrix;

And a second obtaining unit, configured to obtain, according to the target matrix, a spreading code used by the first system, where the spreading code is used to identify a channel occupied by the first system.
The device according to claim 6, wherein the first obtaining unit is configured to:

Obtaining a new transmit signal matrix according to the signal received from the first system frequency band and the joint matrix;

Obtaining a new joint matrix based on the signal received from the first system band and the new transmitted signal matrix;

Obtaining a new transmission signal matrix again according to the signal received from the first system frequency band and the new joint matrix;

And so on;

Obtaining a signal vector satisfying the specified condition in the latest joint matrix when the latest joint matrix is the same as the previous joint matrix;

Obtaining a target transmission signal matrix according to the signal received from the first system frequency band and the signal vector;

A target joint matrix is obtained based on a signal received from the first system band and the target transmit signal matrix.
The device according to claim 7, wherein the first obtaining unit is specifically configured to:

A new transmit signal matrix is obtained based on the signal received from the first system band and the joint matrix, and using the following formula:

B=sgn{Re[(V H V) -1 V H Y]}

Where B is a new transmission signal matrix, V is a joint matrix, Y is a signal received on the first system band, and H is a conjugate transpose.
The device according to claim 6, wherein the second obtaining unit is configured to:

Obtaining new channel parameters according to the target matrix and the spreading code;

Obtaining a new spreading code according to the target matrix and the new channel parameter;

Obtaining new channel parameters again according to the target matrix and the new spreading code;

And so on;

When the latest spreading code is the same as the previous spreading code, it is determined that the latest spreading code is a spreading code used by the first system.
The device according to claim 9, wherein the second obtaining unit is specifically configured to:

Obtaining a new spreading code according to the target matrix and the new channel parameter, and using the following formula:

Where s i is the ith spreading code in the new spreading code, L is the spreading code length, E is the channel parameter matrix, v i is the target matrix vector in the target matrix, and H is the conjugate transpose.