CN109787666B - Frequency domain scheduling method, device and equipment - Google Patents
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Abstract
The invention discloses a frequency domain scheduling method, a device and equipment, belonging to the technical field of wireless communication, wherein the method comprises the following steps: adopting mixed pre-coding for users in the millimeter wave multi-antenna system to obtain the simulated pre-coding weight of each user; dividing all the users into a frequency division multiplexing user group and a user group to be selected according to the analog pre-coding weight; the frequency division multiplexing user group is used as a virtual user to perform space division multiplexing scheduling together with the user group to be selected, and through selection of different multiplexing modes, the throughput of the millimeter wave communication system can be remarkably improved, the interference among space multiplexing users is reduced, and the performance gain of the frequency division multiplexing users is improved.
Description
Technical Field
The present invention relates to the field of wireless communication technologies, and in particular, to a frequency domain scheduling method, apparatus, and device.
Background
Electromagnetic waves with the wavelength of 1-10 mm are called millimeter waves, the millimeter waves release a new frequency spectrum of 30-300GHz, and the new frequency spectrum becomes a necessary condition for realizing the GBPS (gigabit per second) transmission rate of 5G, and large-scale MIMO (Multiple-Input Multiple-Output, multi-antenna technology) can overcome the path loss of millimeter wave communication, and the millimeter wave wavelength is short, so that a convenient condition is provided for realizing large-scale MIMO, and therefore the millimeter wave large-scale MIMO is an important realization mode of a 5G wireless communication system.
In the existing MIMO system, pure digital precoding is adopted, and MIMO processing is finished at a baseband. In millimeter wave large scale MIMO systems, in order to reduce the cost and power consumption of the radio frequency power amplifier, analog-digital hybrid precoding is often adopted, that is, digital precoding is implemented in the baseband, and analog precoding is implemented in the analog domain after IFFT (inverse fourier transform).
The millimeter wave system provides a large bandwidth of more than 1GHz, and the channel between the base station and the terminal has multipath in the micro-cellular scene, so that the millimeter wave channel has frequency selective fading, while the frequency domain scheduling schedules a plurality of users on the whole bandwidth, schedules different users on the physical resource with the best channel quality, and can obviously improve the system capacity.
However, in the millimeter wave massive MIMO system, the processing of analog precoding is the same over the entire bandwidth, and the phases of analog precoding for scheduling multiple users on different frequency channels are not necessarily the same, so a joint optimization design of hybrid precoding and frequency domain scheduling needs to be considered.
Disclosure of Invention
In view of this, an object of the present invention is to provide a frequency domain scheduling method, apparatus and device, which can significantly improve throughput of a millimeter wave communication system, reduce interference between spatial multiplexing users and improve performance gain of frequency division multiplexing users through selection of different multiplexing modes.
The technical scheme adopted by the invention for solving the technical problems is as follows:
according to an aspect of the present invention, a frequency domain scheduling method is provided, which includes:
adopting mixed pre-coding for users in the millimeter wave multi-antenna system to obtain the simulated pre-coding weight of each user;
dividing all the users into a frequency division multiplexing user group and a user group to be selected according to the analog pre-coding weight;
and taking the frequency division multiplexing user group as a virtual user and carrying out space division multiplexing scheduling together with the user group to be selected.
According to another aspect of the present invention, there is provided a frequency domain scheduling apparatus, including:
the mixed pre-coding module is used for adopting mixed pre-coding for the users in the millimeter wave multi-antenna system to obtain the simulated pre-coding weight of each user;
the frequency division multiplexing module is used for dividing all the users into a frequency division multiplexing user group and a user group to be selected according to the analog pre-coding weight;
and the space division multiplexing module is used for taking the frequency division multiplexing user group as a virtual user and carrying out space division multiplexing scheduling together with the user group to be selected.
According to yet another aspect of the present invention, there is provided a frequency domain scheduling apparatus comprising a memory, a processor, and at least one application stored in the memory and configured to be executed by the processor, the application being configured to perform the frequency domain scheduling method described above.
The embodiment of the invention provides a frequency domain scheduling method, a device and equipment, wherein the method comprises the following steps: adopting mixed pre-coding for users in the millimeter wave multi-antenna system to obtain the simulated pre-coding weight of each user; dividing all the users into a frequency division multiplexing user group and a user group to be selected according to the analog pre-coding weight; the frequency division multiplexing user group is used as a virtual user to perform space division multiplexing scheduling together with the user group to be selected, and through selection of different multiplexing modes, the throughput of the millimeter wave communication system can be remarkably improved, the interference among space multiplexing users is reduced, and the performance gain of the frequency division multiplexing users is improved.
Drawings
Fig. 1 is a flowchart of a frequency domain scheduling method according to an embodiment of the present invention;
fig. 2 is a schematic diagram illustrating an operation principle of a millimeter wave large-scale multi-antenna system according to an embodiment of the present invention;
FIG. 3 is a flowchart of the method of step S20 in FIG. 1;
fig. 4 is a schematic diagram of multi-user frequency division multiplexing according to an embodiment of the present invention;
FIG. 5 is a flowchart of the method of step S30 in FIG. 1;
fig. 6 is a flowchart of a frequency domain scheduling method according to a second embodiment of the present invention;
fig. 7 is a block diagram illustrating an exemplary structure of a frequency domain scheduling apparatus according to a third embodiment of the present invention;
FIG. 8 is a block diagram of an exemplary architecture of the frequency division multiplexing module of FIG. 7;
FIG. 9 is a block diagram of an exemplary configuration of the WDM module of FIG. 7;
fig. 10 is a block diagram of an exemplary structure of a frequency domain scheduling apparatus according to a fourth embodiment of the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example one
As shown in fig. 1, a frequency domain scheduling method includes:
s10, mixed pre-coding is adopted for users in the millimeter wave multi-antenna system, and the simulation pre-coding weight of each user is obtained;
s20, dividing all the users into a frequency division multiplexing user group and a user group to be selected according to the analog pre-coding weight;
and S30, taking the FDM user group as a virtual user, and performing space division multiplexing scheduling together with the user group to be selected.
In the embodiment, through selection of different multiplexing modes, the throughput of the millimeter wave communication system can be remarkably improved, the interference among spatial multiplexing users is reduced, and the performance gain of frequency division multiplexing users is improved.
In this embodiment, the method is suitable for use in a millimeter wave multi-antenna system and similar multi-antenna multi-user communication systems, and the steps in the method are performed by the millimeter wave multi-antenna system.
In this embodiment, in the millimeter wave large-scale multi-antenna system, the communication link has frequency selective fading, that is, due to the sensitivity of the millimeter wave to the frequency, the frequency fading in some frequency bands of the whole bandwidth is unstable, which may cause that the common frequency division multiplexing or code division multiplexing may not achieve the maximization of the system rate, and further may not achieve the optimal capacity of the system.
In this embodiment, when the analog precoding processing is simply adopted, the weights on the whole bandwidth are the same, which is not beneficial to the scheduling of frequency division multiplexing according to the weights of the analog precoding, so in this embodiment, a processing mode of hybrid precoding, that is, a mode of combining digital precoding and analog precoding, is adopted, so that the analog precoding weights of each user are not the same any more.
As shown in fig. 2, the working principle of the millimeter-wave large-scale multi-antenna system is schematically illustrated, and the system includes a transmitter, a baseband channel and a receiver, wherein the baseband channel is connected with the transmitter and the receiver through a plurality of radio frequency links, a multi-antenna MIMO channel is disposed in the baseband channel, and a precoder is disposed in the transmitter.
In this embodiment, the analog precoding weights may be expressed by channel correlation, and due to the sparse property of the millimeter wave channel, the energy of each user is only concentrated on some points in the space, and the energy on other areas is very little. When the channels of multiple users are not correlated, they correspond to different beams, thereby reducing interference among users. Therefore, the channel correlation can be used as an evaluation criterion for determining whether there is interference between users.
As shown in fig. 3, in the present embodiment, the step S20 includes:
s21, acquiring the channel correlation of every two users;
s22, judging whether the channel correlation is larger than a preset correlation threshold;
if yes, the step S23 is carried out, and the two users are distributed to the same frequency division multiplexing user group;
otherwise, the process proceeds to step S24, where users unrelated to the ofdm user group are allocated to the user group to be selected.
In this embodiment, the users in the ofdm user group share the whole bandwidth, and respectively schedule to transmit their respective signals on the frequency domain resource with the best link quality.
As shown in fig. 4, for a schematic diagram of multiuser frequency division multiplexing, in a scheduling time window, a plurality of sdm user groups are scheduled on the whole frequency band, wherein each member of the user group has the same spatial characteristic and is allocated in different frequency sub-bands so as to eliminate mutual interference, as shown in fig. 4, the frequency band includes K users, and through calculation of channel correlation between each two users, it is known that the correlation between user 1, user 3 and user 5 is greater than a preset correlation threshold value, the three users form a frequency division multiplexing user group, also referred to as virtual user group 1, and the correlation between user 2 and user 4 is also greater than a preset correlation threshold value, then the two users form another frequency division multiplexing user group, also referred to as virtual user group 2, and the other users have no correlation with the two frequency division multiplexing user groups, are assigned to the group of users to be selected.
In the embodiment shown in fig. 4, user 1, user 3, and user 5 in virtual user group 1 form a frequency division multiplexing user group, share the whole bandwidth, and respectively schedule to transmit their respective signals on the frequency domain resources with the best link quality; and the users 2 and 4 in the virtual user group 2 form a frequency division multiplexing user group, share the whole bandwidth, and are respectively scheduled to send respective signals on the frequency domain resources with the best link quality.
As shown in fig. 5, in the present embodiment, the step S30 includes:
s31, taking the FDM user group as a virtual user, and calculating the comprehensive channel gain of the FDM user group;
s32, calculating the channel gains of all the users to be selected;
s33, selecting the user with the best channel gain from the comprehensive channel gain and the channel gains of all the users to be selected as the first user of space division multiplexing;
and S34, selecting space division multiplexing users according to the principle of maximum sum rate, wherein the number of the space division multiplexing users is equal to the number of radio frequency links of the millimeter wave multi-antenna system.
In this embodiment, the purpose of spatial multiplexing user selection is to maximize the sum rate so as to improve the throughput of the system, and in order to reduce the complexity of spatial multiplexing user selection, a user with the best channel gain is given a priority selection, that is, a user with the largest SNR is selected as a first user, and the selection of the remaining spatial multiplexing users can also be calculated according to a sum rate calculation formula, where the number of spatial multiplexing users is equal to the number K of radio frequency links, that is, K-1 calculation is performed in addition to the first user, a corresponding spatial multiplexing user is selected, and scheduling is performed according to the selection result.
In this embodiment, after step S30, the method further includes:
and selecting different orders of modulation coding modes on the whole bandwidth according to different channel quality indications. For example, when the channel quality is high, a high-order modulation coding format is adopted, and when the channel quality is low, a low-order modulation coding format is adopted, which also helps to further improve the throughput of the system.
In this embodiment, different order modulation and coding modes can be automatically selected according to different channel quality indications by the millimeter wave multi-antenna system; the manager or operator of the millimeter wave multi-antenna system can manually select different modulation and coding modes of equal order.
Example two
As shown in fig. 6, in this embodiment, the analog precoding weights may be expressed by beam directions, and accordingly, the step S20 includes:
s201, obtaining the beam direction of each user;
s202, distributing users with the same beam direction to a frequency division multiplexing user group;
and S203, allocating users with different beam directions from those of the FDM user group to a user group to be selected.
In this embodiment, the users in the ofdm user group share the whole bandwidth, and respectively schedule to transmit their respective signals on the frequency domain resource with the best link quality.
As shown in fig. 5, in the present embodiment, the step S30 includes:
s31, taking the FDM user group as a virtual user, and calculating the comprehensive channel gain of the FDM user group;
s32, calculating the channel gains of all the users to be selected;
s33, selecting the user with the best channel gain from the comprehensive channel gain and the channel gains of all the users to be selected as the first user of space division multiplexing;
and S34, selecting space division multiplexing users according to the principle of maximum sum rate, wherein the number of the space division multiplexing users is equal to the number of radio frequency links of the millimeter wave multi-antenna system.
In this embodiment, the purpose of spatial multiplexing user selection is to maximize the sum rate so as to improve the throughput of the system, and in order to reduce the complexity of spatial multiplexing user selection, a user with the best channel gain is given a priority selection, that is, a user with the largest SNR is selected as a first user, and the selection of the remaining spatial multiplexing users can also be calculated according to a sum rate calculation formula, where the number of spatial multiplexing users is equal to the number K of radio frequency links, that is, K-1 calculation is performed in addition to the first user, a corresponding spatial multiplexing user is selected, and scheduling is performed according to the selection result.
In this embodiment, after step S30, the method further includes:
and selecting different orders of modulation coding modes on the whole bandwidth according to different channel quality indications. For example, when the channel quality is high, a high-order modulation coding format is adopted, and when the channel quality is low, a low-order modulation coding format is adopted, which also helps to further improve the throughput of the system.
EXAMPLE III
As shown in fig. 7, in this embodiment, a frequency domain scheduling apparatus includes:
a hybrid pre-coding module 10, configured to perform hybrid pre-coding on users in the millimeter wave multi-antenna system to obtain a simulated pre-coding weight of each user;
the frequency division multiplexing module 20 is configured to divide all the users into a frequency division multiplexing user group and a user group to be selected according to the analog pre-coding weight;
and the space division multiplexing module 30 is configured to use the ofdm user group as a virtual user, and perform space division multiplexing scheduling together with the user group to be selected.
In the embodiment, through selection of different multiplexing modes, the throughput of the millimeter wave communication system can be remarkably improved, the interference among spatial multiplexing users is reduced, and the performance gain of frequency division multiplexing users is improved.
In this embodiment, in the millimeter wave large-scale multi-antenna system, the communication link has frequency selective fading, that is, due to the sensitivity of the millimeter wave to the frequency, the frequency fading in some frequency bands of the whole bandwidth is unstable, which may cause that the common frequency division multiplexing or code division multiplexing may not achieve the maximization of the system rate, and further may not achieve the optimal capacity of the system.
In this embodiment, when the analog precoding processing is simply adopted, the weights on the whole bandwidth are the same, which is not beneficial to the scheduling of frequency division multiplexing according to the weights of the analog precoding, so in this embodiment, a processing mode of hybrid precoding, that is, a mode of combining digital precoding and analog precoding, is adopted, so that the analog precoding weights of each user are not the same any more.
As shown in fig. 2, the working principle of the millimeter-wave large-scale multi-antenna system is schematically illustrated, and the system includes a transmitter, a baseband channel and a receiver, wherein the baseband channel is connected with the transmitter and the receiver through a plurality of radio frequency links, a multi-antenna MIMO channel is disposed in the baseband channel, and a precoder is disposed in the transmitter.
In this embodiment, the analog precoding weights may be expressed by channel correlation, and due to the sparse property of the millimeter wave channel, the energy of each user is only concentrated on some points in the space, and the energy on other areas is very little. When the channels of multiple users are not correlated, they correspond to different beams, thereby reducing interference among users. Therefore, the channel correlation can be used as an evaluation criterion for determining whether there is interference between users.
As shown in fig. 8, in this embodiment, the frequency division multiplexing module includes:
a correlation obtaining unit 21, configured to obtain channel correlations for every two users;
a judging unit 22, configured to judge whether the channel correlation is greater than a preset correlation threshold;
a first frequency division multiplexing unit 23, configured to allocate the two users to the same frequency division multiplexing user group when the channel correlation is greater than a preset correlation threshold;
and the first subscriber unit to be selected 24 is configured to allocate the users irrelevant to the frequency division multiplexing user group to the subscriber group to be selected when the channel correlation is not greater than the preset correlation threshold.
In this embodiment, the users in the ofdm user group share the whole bandwidth, and respectively schedule to transmit their respective signals on the frequency domain resource with the best link quality.
As shown in fig. 4, for a schematic diagram of multiuser frequency division multiplexing, in a scheduling time window, a plurality of sdm user groups are scheduled on the whole frequency band, wherein each member of the user group has the same spatial characteristic and is allocated in different frequency sub-bands so as to eliminate mutual interference, as shown in fig. 4, the frequency band includes K users, and through calculation of channel correlation between each two users, it is known that the correlation between user 1, user 3 and user 5 is greater than a preset correlation threshold value, the three users form a frequency division multiplexing user group, also referred to as virtual user group 1, and the correlation between user 2 and user 4 is also greater than a preset correlation threshold value, then the two users form another frequency division multiplexing user group, also referred to as virtual user group 2, and the other users have no correlation with the two frequency division multiplexing user groups, are assigned to the group of users to be selected.
In the embodiment shown in fig. 4, user 1, user 3, and user 5 in virtual user group 1 form a frequency division multiplexing user group, share the whole bandwidth, and respectively schedule to transmit their respective signals on the frequency domain resources with the best link quality; and the users 2 and 4 in the virtual user group 2 form a frequency division multiplexing user group, share the whole bandwidth, and are respectively scheduled to send respective signals on the frequency domain resources with the best link quality.
As shown in fig. 9, in this embodiment, the space division multiplexing module includes:
a channel gain calculation unit 31, configured to calculate a comprehensive channel gain of the ofdm user group by using the ofdm user group as a virtual user; calculating the channel gains of all the users to be selected;
a first user selecting unit 32, configured to select a user with the best channel gain from the integrated channel gain and the channel gains of all the users to be selected as a first user of space division multiplexing;
and a space division multiplexing user selecting unit 33, configured to select a space division multiplexing user according to a principle that a sum rate is maximum, where the number of space division multiplexing users is equal to the number of radio frequency links of the millimeter wave multi-antenna system.
In this embodiment, the purpose of spatial multiplexing user selection is to maximize the sum rate so as to improve the throughput of the system, and in order to reduce the complexity of spatial multiplexing user selection, a user with the best channel gain is given a priority selection, that is, a user with the largest SNR is selected as a first user, and the selection of the remaining spatial multiplexing users can also be calculated according to a sum rate calculation formula, where the number of spatial multiplexing users is equal to the number K of radio frequency links, that is, K-1 calculation is performed in addition to the first user, a corresponding spatial multiplexing user is selected, and scheduling is performed according to the selection result.
In this embodiment, the frequency domain scheduling apparatus further includes:
and the adjusting module is used for selecting different equal-order modulation coding modes on the whole bandwidth according to different channel quality indications. For example, when the channel quality is high, a high-order modulation coding format is adopted, and when the channel quality is low, a low-order modulation coding format is adopted, which also helps to further improve the throughput of the system.
Example four
As shown in fig. 10, in this embodiment, the frequency division multiplexing module includes:
a beam direction acquisition unit 201 for acquiring a beam direction of each user;
a second frequency division multiplexing unit 202, configured to allocate users with the same beam direction to a frequency division multiplexing user group;
and the second user unit 203 to be selected is configured to allocate users with beam directions different from the beam direction of the ofdm user group to the user group to be selected.
In this embodiment, the users in the ofdm user group share the whole bandwidth, and respectively schedule to transmit their respective signals on the frequency domain resource with the best link quality.
As shown in fig. 9, in this embodiment, the space division multiplexing module includes:
a channel gain calculation unit 31, configured to calculate a comprehensive channel gain of the ofdm user group by using the ofdm user group as a virtual user; calculating the channel gains of all the users to be selected;
a first user selecting unit 32, configured to select a user with the best channel gain from the integrated channel gain and the channel gains of all the users to be selected as a first user of space division multiplexing;
and a space division multiplexing user selecting unit 33, configured to select a space division multiplexing user according to a principle that a sum rate is maximum, where the number of space division multiplexing users is equal to the number of radio frequency links of the millimeter wave multi-antenna system.
In this embodiment, the purpose of spatial multiplexing user selection is to maximize the sum rate so as to improve the throughput of the system, and in order to reduce the complexity of spatial multiplexing user selection, a user with the best channel gain is given a priority selection, that is, a user with the largest SNR is selected as a first user, and the selection of the remaining spatial multiplexing users can also be calculated according to a sum rate calculation formula, where the number of spatial multiplexing users is equal to the number K of radio frequency links, that is, K-1 calculation is performed in addition to the first user, a corresponding spatial multiplexing user is selected, and scheduling is performed according to the selection result.
EXAMPLE five
In this embodiment, a frequency domain scheduling apparatus includes a memory, a processor, and at least one application program stored in the memory and configured to be executed by the processor, where the application program is configured to perform the frequency domain scheduling method of the first embodiment or the second embodiment.
It should be noted that the device embodiment and the method embodiment belong to the same concept, and specific implementation processes thereof are described in the method embodiment in detail, and technical features in the method embodiment are correspondingly applicable in the device embodiment, which is not described herein again.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better embodiment. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal device (such as a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.
The preferred embodiments of the present invention have been described above with reference to the accompanying drawings, and are not to be construed as limiting the scope of the invention. Any modifications, equivalents and improvements which may occur to those skilled in the art without departing from the scope and spirit of the present invention are intended to be within the scope of the claims.
Claims (12)
1. A frequency domain scheduling method, comprising:
adopting mixed pre-coding for users in the millimeter wave multi-antenna system to obtain a simulated pre-coding weight value expressed by channel correlation or beam direction of each user;
dividing all the users into a frequency division multiplexing user group and a user group to be selected according to the analog pre-coding weight expressed by the channel correlation or the beam direction;
and taking the frequency division multiplexing user group as a virtual user and carrying out space division multiplexing scheduling together with the user group to be selected.
2. The frequency domain scheduling method of claim 1, wherein the dividing all the users into the frequency division multiplexing user group and the candidate user group according to the analog precoding weights expressed by the channel correlation or expressed by the beam direction comprises:
acquiring the channel correlation of every two users;
judging whether the channel correlation is greater than a preset correlation threshold or not;
if yes, distributing the two users to the same frequency division multiplexing user group;
otherwise, distributing users irrelevant to the FDM user group to the user group to be selected.
3. The frequency domain scheduling method of claim 1, wherein the dividing all the users into the frequency division multiplexing user group and the candidate user group according to the analog precoding weights expressed by the channel correlation or expressed by the beam direction comprises:
acquiring the beam direction of each user;
allocating users with the same beam direction to a frequency division multiplexing user group;
and allocating users with different beam directions from those of the FDM user group to the user group to be selected.
4. A frequency domain scheduling method according to claim 2 or 3, wherein the users in the said set of frequency division multiplexing users share the whole bandwidth, and the respective signals are scheduled to be transmitted on the frequency domain resource with the best link quality.
5. The frequency domain scheduling method of claim 2 or 3, wherein the performing spatial multiplexing scheduling with the candidate user group using the FDM user group as a virtual user comprises:
taking the frequency division multiplexing user group as a virtual user, and calculating the comprehensive channel gain of the frequency division multiplexing user group;
calculating the channel gains of all the users to be selected;
selecting the user with the best channel gain from the comprehensive channel gain and the channel gains of all the users to be selected as a first user of space division multiplexing;
and selecting space division multiplexing users according to the principle of maximum sum rate, wherein the number of the space division multiplexing users is equal to the number of radio frequency links of the millimeter wave multi-antenna system.
6. The frequency domain scheduling method of claim 1, wherein the performing spatial multiplexing scheduling with the candidate user group using the ofdm user group as a virtual user further comprises:
and selecting different orders of modulation coding modes on the whole bandwidth according to different channel quality indications.
7. A frequency domain scheduling apparatus, comprising:
the mixed pre-coding module is used for adopting mixed pre-coding for users in the millimeter wave multi-antenna system to obtain the simulated pre-coding weight expressed by the channel correlation or the beam direction of each user;
the frequency division multiplexing module is used for dividing all the users into a frequency division multiplexing user group and a user group to be selected according to the analog pre-coding weight expressed by the channel correlation or the beam direction;
and the space division multiplexing module is used for taking the frequency division multiplexing user group as a virtual user and carrying out space division multiplexing scheduling together with the user group to be selected.
8. The frequency domain scheduling apparatus of claim 7, wherein the frequency division multiplexing module comprises:
a correlation obtaining unit, configured to obtain channel correlation of every two users;
a judging unit, configured to judge whether the channel correlation is greater than a preset correlation threshold;
the first frequency division multiplexing unit is used for allocating the two users to the same frequency division multiplexing user group when the channel correlation is larger than a preset correlation threshold;
and the first subscriber unit to be selected is used for allocating users irrelevant to the frequency division multiplexing user group to the subscriber group to be selected when the channel correlation is not greater than the preset correlation threshold.
9. The frequency domain scheduling apparatus of claim 7, wherein the frequency division multiplexing module comprises:
a beam direction acquiring unit for acquiring a beam direction of each user;
the second frequency division multiplexing unit is used for distributing the users with the same beam direction to a frequency division multiplexing user group;
and the second user unit to be selected is used for allocating users with different beam directions to the user group to be selected.
10. A frequency domain scheduling apparatus as claimed in claim 8 or 9, wherein the users in the said set of frequency division multiplexing users share the whole bandwidth, and are scheduled to transmit their respective signals on the frequency domain resource with the best link quality.
11. The frequency domain scheduling apparatus of claim 8 or 9, wherein the spatial multiplexing module comprises:
a channel gain calculation unit, configured to calculate a comprehensive channel gain of the ofdm user group by using the ofdm user group as a virtual user; calculating the channel gains of all the users to be selected;
a first user selection unit, configured to select a user with the best channel gain from the integrated channel gain and the channel gains of all the users to be selected as a first user of space division multiplexing;
and the space division multiplexing user selection unit is used for selecting space division multiplexing users according to the principle of maximum sum rate, and the number of the space division multiplexing users is equal to the number of radio frequency links of the millimeter wave multi-antenna system.
12. A frequency domain scheduling apparatus comprising a memory, a processor and at least one application stored in the memory and configured to be executed by the processor, wherein the application is configured to perform the frequency domain scheduling method of any of claims 1-6.
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