CN108923852A - A kind of mixing FSO/RF link trunking transmission method, device and source node - Google Patents

Abstract

This application discloses a hybrid FSO/RF link relay transmission method, device and source node, including generating multiple simultaneous frequency transmission signals; power allocation for each transmission signal; power allocation for each transmission signal Superimposed into a mixed signal; convert the mixed signal into an optical mixed signal; send the optical mixed signal to the relay node; the present invention generates multiple simultaneous frequency transmission signals, and performs power distribution on multiple simultaneous frequency transmission signals, so that each The power of the transmission signals is different, so as to ensure the integrity of each transmission signal, superimpose to obtain a mixed signal, so that multiple transmission signals can be transmitted in the same channel using the same time-frequency resource in the form of a mixed signal , after the destination node receives the radio frequency mixed signal in the form of radio frequency, the interference signal in the radio frequency mixed signal is eliminated, and the transmission signal corresponding to the destination node is obtained, and the hybrid FSO/RF link relay transmission process is completed, and the spectrum utilization rate is improved and transmission signal throughput.

Description

A hybrid FSO/RF link relay transmission method, device and source node

technical field

The present invention relates to the field of wireless communication, in particular to a hybrid FSO/RF link relay transmission method, device and source node.

Background technique

The existing relay transmission system based on OMA (Orthogonal Multiple Access) hybrid RF/FSO (Radio Frequency/Free Space Optical Communication) link, its basic idea is to divide the orthogonal time-frequency resources on the basis of According to the different characteristics of the transmission environment, the traditional RF transmission method is adopted for the link between the base station and the mobile station with high mobility, and the FSO transmission method that can provide higher speed and optical bandwidth is adopted for the link between the base station and the relay with low mobility , so that the advantages of these two transmission methods can be fully utilized to realize high-speed and efficient information transmission.

However, the OMA-based radio frequency transmission of the existing hybrid RF/FSO system is often affected by the shortage of spectrum resources; with the development of new mobile services, the demand for wireless network resources is increasing explosively, and the above problems will become more and more serious .

Therefore, it is necessary to propose a technology that can greatly improve spectrum utilization and can significantly alleviate the shortage of spectrum resources in today's multi-service demand environment.

Contents of the invention

In view of this, the purpose of the present invention is to provide a hybrid FSO/RF link relay transmission method, device and source node, which can improve spectrum utilization and transmission signal throughput, and alleviate the shortage of spectrum resources. The specific plan is as follows:

A hybrid FSO/RF link relay transmission method applied to a source node, comprising:

Generate multiple simultaneous frequency transmission signals;

Power allocation is performed on each transmission signal so that the power of each transmission signal is different;

Superimposing each transmission signal after power distribution into a mixed signal;

converting the mixed signal into an optical signal to obtain an optical mixed signal;

Sending the optical mixed signal to a relay node through an FSO channel, so that the relay node converts the optical mixed signal into a radio frequency signal to obtain a radio frequency mixed signal, and sends the radio frequency mixed signal to a destination through an RF channel node;

Wherein, the destination node receives the radio frequency mixed signal, eliminates an interference signal in the radio frequency mixed signal, and obtains a transmission signal corresponding to the destination node.

Optionally, the process of generating multiple simultaneous-frequency transmission signals includes:

generating multiple initial transmission signals to be transmitted, performing channel coding on the multiple initial transmission signals, and obtaining multiple coded transmission signals of the same channel;

Signal modulation is performed on multiple coded transmission signals to obtain multiple simultaneous frequency transmission signals.

Optionally, the FSO channel and the RF channel follow the M fading distribution and the Rayleigh fading distribution respectively.

Optionally, the process of allocating power to each transmission signal so that the power of each transmission signal is different includes:

The non-orthogonal multiple access technology is used to allocate power to each transmission signal, so that the power of each transmission signal is different.

The present invention also discloses a source node, including:

A generating module, configured to generate multiple simultaneous frequency transmission signals;

A power allocation module, configured to allocate power to each transmission signal, so that the power of each transmission signal is different;

a superposition module, configured to superimpose each transmission signal after power distribution into the mixed signal;

a photoelectric conversion module, configured to convert the mixed signal into an optical signal to obtain the optical mixed signal;

A sending module, configured to send the optical mixed signal to the relay node through the FSO channel.

Optionally, the generating module includes:

a generating unit, configured to generate a plurality of initial transmission signals to be transmitted;

A channel coding unit, configured to perform channel coding on a plurality of initial transmission signals to obtain a plurality of coded transmission signals of the same channel;

The modulation unit is used to perform signal modulation on multiple coded transmission signals to obtain multiple simultaneous frequency transmission signals.

Optionally, the power allocation module is specifically configured to perform power allocation on each transmission signal by using a non-orthogonal multiple access technology, so that the power of each transmission signal is different.

The present invention also discloses a hybrid FSO/RF link relay transmission device, including the aforementioned source node, relay node and destination node;

The relay node is configured to receive an optical mixed signal through an FSO channel, convert the optical mixed signal into a radio frequency signal to obtain a radio frequency mixed signal, and send the radio frequency mixed signal to the destination node through an RF channel;

The destination node is configured to receive the radio frequency mixed signal through the RF channel, eliminate interference signals in the radio frequency mixed signal, and obtain a transmission signal corresponding to the destination node.

Optionally, the relay node includes:

a photodetector, configured to receive the optical mixed signal through the FSO channel, and convert the optical mixed signal into a radio frequency signal to obtain an initial radio frequency mixed signal;

An AF amplifier, configured to amplify the initial radio frequency mixed signal to obtain the radio frequency mixed signal;

An RF signal transmitter, configured to send the radio frequency mixed signal to the destination node through the RF channel.

Optionally, the destination node includes:

a signal receiver for receiving the radio frequency mixed signal through the RF channel;

An interference elimination module, configured to eliminate the interference signal in the radio frequency mixed signal to obtain a transmission signal corresponding to the destination node, where the interference signal includes a transmission signal not corresponding to the destination node.

In the present invention, the hybrid FSO/RF link relay transmission method includes: generating a plurality of simultaneous frequency transmission signals; power allocation for each transmission signal, so that the power of each transmission signal is different; after power allocation Each of the transmission signals is superimposed into a mixed signal; the mixed signal is converted into an optical signal to obtain an optical mixed signal; the optical mixed signal is sent to the relay node through the FSO channel, so that the relay node converts the optical mixed signal into a radio frequency signal, The radio frequency mixed signal is obtained, and the radio frequency mixed signal is sent to the destination node through the RF channel; wherein, the destination node receives the radio frequency mixed signal, eliminates the interference signal in the radio frequency mixed signal, and obtains the transmission signal corresponding to the destination node.

The present invention generates a plurality of simultaneous frequency transmission signals, and performs power distribution on the multiple simultaneous frequency transmission signals, so that the power of each transmission signal is different, thereby achieving superposition under the condition of ensuring the integrity of each transmission signal, Obtain a mixed signal, so that multiple transmission signals can be transmitted in the same channel in the form of a mixed signal using the same time-frequency resource. After the destination node receives the mixed signal in the form of a radio frequency, the interference signal in the mixed signal is eliminated. , to obtain the transmission signal corresponding to the destination node, complete the hybrid FSO/RF link relay transmission process, improve spectrum utilization and transmission signal throughput, and alleviate the shortage of spectrum resources.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only It is an embodiment of the present invention, and those skilled in the art can also obtain other drawings according to the provided drawings without creative work.

FIG. 1 is a schematic flowchart of a hybrid FSO/RF link relay transmission method provided by an embodiment of the present invention;

FIG. 2 is a schematic flowchart of another hybrid FSO/RF link relay transmission method provided by an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a source node provided by an embodiment of the present invention;

Fig. 4 is a schematic structural diagram of a hybrid FSO/RF link relay transmission device provided by an embodiment of the present invention.

Detailed ways

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

The embodiment of the present invention discloses a hybrid FSO/RF link relay transmission method, as shown in Figure 1, the method includes:

S1: Generate multiple simultaneous frequency transmission signals;

S2: Perform power allocation for each transmission signal, so that the power of each transmission signal is different;

S3: superimposing each transmission signal after power allocation into a mixed signal;

S4: converting the mixed signal into an optical signal to obtain an optical mixed signal;

S5: Send the optical mixed signal to the relay node through the FSO channel, so that the relay node converts the optical mixed signal into a radio frequency signal, obtains the radio frequency mixed signal, and sends the radio frequency mixed signal to the destination node through the RF channel;

Wherein, the destination node receives the radio frequency mixed signal, eliminates the interference signal in the radio frequency mixed signal, and obtains the transmission signal corresponding to the destination node.

Specifically, when generating transmission signals, instead of generating transmission signals sequentially sent to different users, multiple simultaneous frequency transmission signals sent to different users at the same time are generated; after generating transmission signals, each transmission signal is simultaneously Correspondingly carry out power allocation, allocate different power for each transmission signal, so that the power of each transmission signal is different, so multiple transmission signals at the same frequency can be superimposed on each other to become a mixed signal, and the mixed signal can replace Multiple simultaneous-frequency transmission signals are transmitted in the same channel, realizing simultaneous transmission of multiple transmission signals on the same channel, allowing multiple users to share a channel, and the same channel is no longer only allocated to one user's transmission signal for processing, thereby improving the single The data throughput of the channel.

Specifically, after converting the mixed signal into an optical signal, the optical mixed signal is sent to the relay node through a single FSO channel, and the relay node converts the optical mixed signal into a radio frequency signal, and the obtained radio frequency mixed signal is sent to the destination through a single RF channel node, and the destination node receives the RF mixed signal. Since different users on the same channel are non-orthogonal transmissions, this will cause inter-user interference, that is, different transmission signals interfere with each other. At this time, the RF mixed signal is not consistent with the destination The transmission signal corresponding to the node is an interference signal to the destination node. Therefore, the destination node obtains the transmission signal corresponding to the destination node by eliminating the interference signal in the radio frequency mixed signal.

It can be seen that the embodiment of the present invention generates multiple simultaneous-frequency transmission signals, and performs power allocation on multiple simultaneous-frequency transmission signals, so that the power of each transmission signal is different, thereby achieving , perform superposition to obtain a mixed signal, so that multiple transmission signals can be transmitted in the same channel in the form of a mixed signal using the same time-frequency resource. After the destination node receives the mixed signal in the form of radio frequency, the The interference signal is eliminated, and the transmission signal corresponding to the destination node is obtained, and the hybrid FSO/RF link relay transmission process is completed, the spectrum utilization rate and transmission signal throughput are improved, and the shortage of spectrum resources is alleviated.

The embodiment of the present invention discloses a specific hybrid FSO/RF link relay transmission method. Compared with the previous embodiment, this embodiment further explains and optimizes the technical solution. specific:

Specifically, as shown in FIG. 2, before power allocation is performed on the transmission signal, the transmission signal needs to be encoded and modulated. Therefore, the process of generating multiple transmission signals at the same frequency in S1 above specifically includes S11 and S12; wherein,

S11: Generate multiple initial transmission signals to be transmitted, perform channel coding on the multiple initial transmission signals, and obtain multiple coded transmission signals of the same channel;

S12: Perform signal modulation on multiple coded transmission signals to obtain multiple simultaneous frequency transmission signals.

Specifically, multiple initial transmission signals to be transmitted to different users are generated, and channel coding is performed on each initial transmission signal, so that each initial transmission signal belongs to the same channel, and multiple coded transmission signals of the same channel are obtained , and then perform modulation so that each coded transmission signal carries the carrier of the same time slot and frequency, that is, the same time-frequency resource, so as to obtain multiple transmission signals of the same frequency.

In the embodiment of the present invention, the non-orthogonal multiple access technology is used to implement power allocation for each transmission signal, so that the power of each transmission signal is different.

Wherein, the above-mentioned FSO channel and RF channel obey the M fading distribution and the Rayleigh fading distribution respectively.

Correspondingly, the embodiment of the present invention also discloses a source node, as shown in FIG. 3 , the node includes:

A generating module, configured to generate multiple simultaneous frequency transmission signals;

A power allocation module, configured to allocate power to each transmission signal, so that the power of each transmission signal is different;

a superposition module, configured to superimpose each transmission signal after power distribution into a mixed signal;

The photoelectric conversion module is used to convert the mixed signal into an optical signal to obtain an optical mixed signal;

The sending module is used to send the optical mixed signal to the relay node through the FSO channel.

It can be seen that the embodiment of the present invention generates multiple simultaneous-frequency transmission signals, and performs power allocation on multiple simultaneous-frequency transmission signals, so that the power of each transmission signal is different, thereby achieving , perform superposition to obtain a mixed signal, so that multiple transmission signals can be transmitted in the same channel in the form of a mixed signal using the same time-frequency resource. After the destination node receives the mixed signal in the form of radio frequency, the The interference signal is eliminated, and the transmission signal corresponding to the destination node is obtained, and the hybrid FSO/RF link relay transmission process is completed, the spectrum utilization rate and transmission signal throughput are improved, and the shortage of spectrum resources is alleviated.

Specifically, the above generation module includes a generation unit, a channel coding unit, and a modulation unit; wherein,

a generating unit, configured to generate a plurality of initial transmission signals to be transmitted;

A channel coding unit, configured to perform channel coding on a plurality of initial transmission signals to obtain a plurality of coded transmission signals of the same channel;

The modulation unit is used to perform signal modulation on multiple coded transmission signals to obtain multiple simultaneous frequency transmission signals.

The above power allocation module is specifically used to allocate power to each transmission signal by using non-orthogonal multiple access technology, so that the power of each transmission signal is different.

Wherein, the above-mentioned FSO channel and RF channel obey the M fading distribution and the Rayleigh fading distribution respectively.

In addition, the embodiment of the present invention also discloses a hybrid FSO/RF link relay transmission device, as shown in FIG. 4, the device includes the aforementioned source node, relay node and destination node;

The relay node is used to convert the optical mixed signal into a radio frequency signal through the FSO channel, obtain the radio frequency mixed signal, and send the radio frequency mixed signal to the destination node through the RF channel;

The destination node is configured to receive the radio frequency mixed signal through the RF channel, eliminate the interference signal in the radio frequency mixed signal, and obtain the transmission signal corresponding to the destination node.

For the specific structure of the source node, reference may be made to the foregoing embodiments, and details are not repeated here.

Specifically, the above-mentioned relay node may include a photodetector, an AF amplifier, and an RF signal transmitter; wherein,

A photodetector is used to receive the optical mixed signal through the FSO channel, and convert the optical mixed signal into a radio frequency signal to obtain an initial radio frequency mixed signal;

The AF amplifier is used to amplify the initial radio frequency mixed signal to obtain the radio frequency mixed signal;

The RF signal transmitter is used to send the radio frequency mixed signal to the destination node through the RF channel.

The above-mentioned destination node may include a signal receiver and an interference elimination module; wherein,

a signal receiver for receiving a radio frequency mixed signal through an RF channel;

The interference elimination module is used to eliminate the interference signal in the radio frequency mixed signal to obtain the transmission signal corresponding to the destination node, and the interference signal includes the transmission signal not corresponding to the destination node.

Finally, it should also be noted that in this text, relational terms such as first and second etc. are only used to distinguish one entity or operation from another, and do not necessarily require or imply that these entities or operations, any such actual relationship or order exists. Furthermore, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus comprising a set of elements includes not only those elements, but also includes elements not expressly listed. other elements of or also include elements inherent in such a process, method, article, or device. Without further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article or apparatus comprising said element.

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

A hybrid FSO/RF link relay transmission method, device, and source node provided by the present invention have been introduced above in detail. In this paper, specific examples are used to illustrate the principle and implementation of the present invention. The above embodiments The description is only used to help understand the method of the present invention and its core idea; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation and scope of application. In summary , the contents of this specification should not be construed as limiting the present invention.

Claims (10)

1. A relay transmission method of a hybrid FSO/RF link is applied to a source node and comprises the following steps:

generating a plurality of transmission signals at the same time frequency;

performing power distribution on each transmission signal to ensure that the power of each transmission signal is different;

superposing each transmission signal after power distribution into a mixed signal;

converting the mixed signal into an optical signal to obtain an optical mixed signal;

sending the optical mixed signal to a relay node through an FSO channel so that the relay node converts the optical mixed signal into a radio frequency signal to obtain a radio frequency mixed signal, and sending the radio frequency mixed signal to a destination node through an RF channel;

and the destination node receives the radio frequency mixed signal, eliminates an interference signal in the radio frequency mixed signal and obtains a transmission signal corresponding to the destination node.

2. The hybrid FSO/RF link relay transmission method according to claim 1, wherein said process of generating a plurality of co-time frequency transmission signals comprises:

generating a plurality of initial transmission signals to be transmitted, and carrying out channel coding on the plurality of initial transmission signals to obtain a plurality of co-channel coded transmission signals;

and carrying out signal modulation on the plurality of coded transmission signals to obtain a plurality of transmission signals with the same time frequency.

3. The hybrid FSO/RF link relay transmission method according to claim 1, wherein the FSO channel and the RF channel are subject to an M-fading distribution and a rayleigh fading distribution, respectively.

4. A hybrid FSO/RF link relay transmission method according to any of claims 1 to 3, wherein said process of allocating power to each transmission signal so that the power of each transmission signal is different comprises:

and performing power distribution on each transmission signal by using a non-orthogonal multiple access technology to ensure that the power of each transmission signal is different.

5. A source node, comprising:

the generating module is used for generating a plurality of transmission signals with the same time frequency;

the power distribution module is used for carrying out power distribution on each transmission signal so as to enable the power of each transmission signal to be different;

the superposition module is used for superposing each transmission signal after power distribution into the mixed signal;

the photoelectric conversion module is used for converting the mixed signal into an optical signal to obtain the optical mixed signal;

and the sending module is used for sending the optical mixed signal to the relay node through an FSO channel.

6. The source node of claim 5, wherein the generating module comprises:

a generating unit, configured to generate a plurality of initial transmission signals to be transmitted;

the channel coding unit is used for carrying out channel coding on the plurality of initial transmission signals to obtain a plurality of co-channel coded transmission signals;

and the modulation unit is used for carrying out signal modulation on the plurality of coded transmission signals to obtain a plurality of transmission signals with the same time frequency.

7. The source node according to claim 5 or 6, wherein the power allocation module is configured to allocate power to each transmission signal using a non-orthogonal multiple access technique, such that the power of each transmission signal is different.

8. A hybrid FSO/RF link relay transmission apparatus, comprising a source node, a relay node and a destination node according to any one of claims 5 to 7;

the relay node is used for receiving the optical mixed signal through the FSO channel, converting the optical mixed signal into a radio frequency signal to obtain a radio frequency mixed signal, and sending the radio frequency mixed signal to the destination node through the RF channel;

and the destination node is used for receiving the radio frequency mixed signal through the RF channel, eliminating an interference signal in the radio frequency mixed signal and obtaining a transmission signal corresponding to the destination node.

9. The hybrid FSO/RF link relay transmission apparatus of claim 8, wherein the relay node comprises:

the photoelectric detector is used for receiving the optical mixed signal through the FSO channel and converting the optical mixed signal into a radio frequency signal to obtain an initial radio frequency mixed signal;

the AF amplifier is used for amplifying the initial radio frequency mixed signal to obtain a radio frequency mixed signal;

an RF signal transmitter for transmitting the radio frequency composite signal to the destination node through the RF channel.

10. The hybrid FSO/RF link relay transmission apparatus of claim 8, wherein said destination node comprises:

a signal receiver for receiving the radio frequency composite signal over the RF channel;

and the interference elimination module is used for eliminating the interference signals in the radio frequency mixed signals to obtain transmission signals corresponding to the target node, wherein the interference signals comprise the transmission signals which do not correspond to the target node.