CN108924898B - Buffer-based wireless relay network interference suppression method and system - Google Patents
Buffer-based wireless relay network interference suppression method and system Download PDFInfo
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Abstract
The invention relates to a wireless relay network interference suppression method and a system based on buffering, wherein the method comprises the following steps: step A, a relay node estimates the communication quality of a first hop and a second hop in a communication link to obtain an initial channel quality estimation value; b, the relay node carries out smoothing treatment on the initial channel quality estimation value to obtain an average channel quality estimation value; step C, judging and determining which one of the first hop link and the second hop link is activated according to the average channel quality estimated value; step D, if the first hop link is judged to be activated, the relay node prepares to receive the wireless signal of the source node, demodulates and decodes the received signal, and sends the decoded data to a queue in a buffer area for queuing processing; and step E, if the second hop link is judged to be activated, the relay node extracts the data packet with the highest priority from the queue in the buffer area, performs coding modulation on the data packet and then sends the data packet to the target node.
Description
Technical Field
The invention relates to the technical field of wireless communication, in particular to a wireless relay network interference suppression method and system based on buffering.
Background
Wireless relay networks have been widely researched and discussed as one of the key technologies of the next generation wireless mobile communication system. The wireless relay technology can enhance the coverage capability of a wireless network and improve the effective throughput rate of the system. However, due to interference from other co-channel signals in the network, the system capacity of the relay node is rapidly reduced due to the reduction of the effective snr of the receiving link, and how to suppress the co-channel interference received by the relay node by a simple and effective method becomes a technical problem to be solved urgently.
The existing relay node interference suppression method generally performs interference avoidance by a multi-user selection strategy, and the algorithm selects a node with the minimum interference from a plurality of candidate user sets to transmit and receive signals so as to minimize the interference.
However, the prior art interference suppression method has the following disadvantages:
1. the co-channel interference is reduced through multi-user selection, and the application scene is limited. A large number of users must exist simultaneously to realize the advantage of multi-user diversity gain.
2. Problems of multi-user fairness and untimely multi-user scheduling may occur.
In view of the shortcomings of the prior art, there is a strong need in the market to design a method and system for achieving co-channel interference suppression through simple link selection.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a wireless relay network interference suppression method based on buffering, which comprises the following steps:
step A, a relay node estimates the communication quality of a first hop and a second hop in a communication link to obtain an initial channel quality estimation value;
b, the relay node carries out smoothing processing on the initial channel quality estimation value to obtain an average channel quality estimation value;
step C, the relay node judges and determines which hop link in the first hop link and the second hop link is activated according to the average channel quality estimation value;
step D, if the first hop link is judged to be activated, the relay node prepares to receive the wireless signal of the source node, modulates and decodes the received wireless signal, and sends the decoded data to a queue in a buffer area for queuing processing;
and step E, if the second hop link is judged to be activated, the relay node extracts the data packet with the highest priority from the queue in the buffer area, modulates and decodes the data packet and then sends the data packet to the target node.
Further, the method for estimating, by the relay node in step a, the communication quality of the first hop and the second hop in the communication link includes: and calculating the pilot signal of the uplink by using a channel estimation algorithm to obtain an initial channel quality estimation value.
Further, the method for estimating, by the relay node in step a, the communication quality of the first hop and the second hop in the communication link includes: and obtaining the channel quality through a feedback channel of the source node or the target node to obtain an initial channel quality estimation value.
Further, the method for the relay node to smooth the initial channel quality estimation value in step B includes: and carrying out smoothing processing by adopting multiple estimation and averaging or adopting an iterative algorithm.
Further, the step C specifically includes: and the relay node judges according to the average channel quality estimated value, if the average channel quality estimated value of the first hop link is larger than the average channel quality estimated value of the second hop link, the first hop link is judged to be activated, otherwise, the second hop link is judged to be activated.
Further, the step D specifically includes: if the first hop link is judged to be activated, the relay node prepares to receive the wireless signal of the source node, modulates and decodes the received signal, if the decoding is correct, sends the decoded signal into a queue in a buffer area for queuing processing, and if the decoding fails, the state in the buffer area is kept unchanged.
Further, the method for the relay node to send the decoded data to the queue in the buffer for queuing in step D includes: and queuing by adopting a first-in first-out mechanism or a priority mark.
The system comprises a source node, a relay node and a target node, wherein the source node and the target node perform wireless data transmission through the target node, the relay node comprises a channel quality estimation module, a statistical processing module, a judgment module, a decoding module, a queuing module, a queue data extraction module and a data transmission module, wherein,
the channel quality estimation module is used for estimating the channel quality of a first hop link between the source node and the relay node and a second hop link between the relay node and the target node to obtain an initial channel quality estimation value, and the channel quality estimation module is electrically connected with the statistical processing module;
the statistical processing module is used for smoothing the initial channel quality estimation value obtained by the channel quality estimation module to obtain an average channel quality estimation value, and the statistical processing module is respectively and electrically connected with the channel quality estimation module and the judgment module;
the decision module is used for deciding which of a first hop link between a source node and a relay node and a second hop link between the relay node and a target node is activated according to the average channel quality estimation value obtained by the statistical processing module, and the decision module is respectively and electrically connected with the statistical processing module, the decoding module and the queue data extraction module;
the decoding module is used for modulating and decoding the received wireless signals transmitted by the source node, and the decoding module is respectively and electrically connected with the judging module and the queuing module;
the queuing module is used for queuing the data decoded by the decoding module, and the queuing module is electrically connected with the decoding module and the queue data extraction module respectively;
the queue data extraction module is used for extracting a data packet with the highest priority from a data queue in the queuing module, and the queue data extraction module is respectively and electrically connected with the judgment module, the queuing module and the data sending module;
the data sending module is used for adjusting and decoding the data packets extracted by the queue data extraction module and then sending the data packets to a target node, and the data sending module is electrically connected with the queue data extraction module.
Furthermore, the statistical processing module adopts a method of averaging multiple estimates or adopts an iterative algorithm to smooth the initial channel quality estimation value.
Further, the queuing module performs queuing processing by adopting a first-in first-out mechanism, or performs queuing processing by adopting a priority mark.
Compared with the prior art, the invention provides the wireless relay network interference suppression method and system based on the buffer, the two-hop link is selected through the buffer area of the relay node, and the link with less interference is selected for transmission, so that the effective signal-to-interference-and-noise ratio of the system is improved, and the system capacity is improved.
Drawings
Fig. 1 is a flow chart of a buffer-based interference suppression method for a wireless relay network according to the present invention;
fig. 2 is a schematic diagram of the overall structure of the buffer-based interference suppression system of the wireless relay network according to the present invention;
fig. 3 is a schematic structural diagram of a relay node of the buffer-based interference suppression system for a wireless relay network according to the present invention.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
As shown in fig. 1, an embodiment of a method for suppressing interference in a wireless relay network based on buffering according to the present invention includes:
step S100, a relay node estimates the communication quality of a first hop and a second hop in a communication link to obtain an initial channel quality estimation value;
step S200, the relay node carries out smoothing processing on the initial channel quality estimation value to obtain an average channel quality estimation value;
step S300, the relay node judges and determines which hop link in the first hop link and the second hop link is activated according to the average channel quality estimation value;
step S400, if the first hop link is judged to be activated, the relay node prepares to receive the wireless signal of the source node, modulates and decodes the received wireless signal, and sends the decoded data to a queue in a buffer area for queuing processing;
step S500, if the second hop link is activated, the relay node extracts the data packet with the highest priority from the queue in the buffer area, modulates and decodes the data packet and then sends the data packet to the target node.
In step S100, the method for estimating the communication quality of the first hop and the second hop in the communication link by the relay node includes: and calculating the pilot signal of the uplink by using a channel estimation algorithm to obtain an initial channel quality estimation value.
In step S100, the method for estimating the communication quality of the first hop and the second hop in the communication link by the relay node includes: and obtaining the channel quality through a feedback channel of the source node or the target node to obtain an initial channel quality estimation value.
In step S200, the method for the relay node to smooth the initial channel quality estimation value includes: and carrying out smoothing processing by adopting multiple estimation and averaging or adopting an iterative algorithm.
Wherein, the step S300 specifically includes: and the relay node judges according to the average channel quality estimated value, if the average channel quality estimated value of the first hop link is larger than the average channel quality estimated value of the second hop link, the first hop link is judged to be activated, otherwise, the second hop link is judged to be activated.
Wherein, the step S400 specifically includes: if the first hop link is judged to be activated, the relay node prepares to receive the wireless signal of the source node, modulates and decodes the received signal, if the decoding is correct, sends the decoded signal into a queue in a buffer area for queuing processing, and if the decoding fails, the state in the buffer area is kept unchanged.
In step S400, the method for the relay node to send the decoded data to the queue in the buffer for queuing processing includes: and queuing by adopting a first-in first-out mechanism or a priority mark.
Referring to fig. 2 and 3, an embodiment of a buffer-based wireless relay network interference suppression system is provided, where the system includes a source node 10, a relay node 20, and a target node 30, where the source node 10 and the target node 30 perform wireless data transmission through the relay node 20, and the relay node 20 includes a channel quality estimation module 21, a statistical processing module 22, a decision module 23, a decoding module 24, a queuing module 25, a queue data extraction module 26, and a data transmission module 27, where,
the channel quality estimation module 21 is configured to estimate channel quality of a first hop link between the source node 10 and the relay node 20 and a second hop link between the relay node 20 and the target node 30 to obtain an initial channel quality estimation value, and the channel quality estimation module 21 is electrically connected to the statistical processing module;
the statistical processing module 22 is configured to perform smoothing processing on the initial channel quality estimation value obtained by the channel quality estimation module 21 to obtain an average channel quality estimation value, and the statistical processing module 22 is electrically connected to the channel quality estimation module 21 and the decision module 23 respectively;
the decision module 23 is configured to decide, according to the average channel quality estimation value obtained by the statistical processing module 22, which of a first-hop link between the source node 10 and the relay node 20 and a second-hop link between the relay node 20 and the target node 30 is activated, where the decision module 23 is electrically connected to the statistical processing module 22, the decoding module 24, and the queue data extraction module 26, respectively;
the decoding module 24 is configured to modulate and decode a received wireless signal transmitted by the source node 10, and the decoding module 24 is electrically connected to the determining module 23 and the queuing module 25 respectively;
the queuing module 25 is configured to queue the data decoded by the decoding module 24, and the queuing module 25 is electrically connected to the decoding module 24 and the queue data extraction module 26 respectively;
the queue data extraction module 26 is configured to extract a data packet with a highest priority from a data queue in the queuing module 25, where the queue data extraction module 26 is electrically connected to the decision module 23, the queuing module 25, and the data sending module 27 respectively;
the data sending module 27 is configured to adjust and decode the data packet extracted by the queue data extraction module 26 and send the data packet to a target node, and the data sending module 27 is electrically connected to the queue data extraction module 26.
The statistical processing module adopts a method of averaging multiple estimated values or adopts an iterative algorithm to carry out smoothing processing on the initial channel quality estimated value.
The queuing module adopts a first-in first-out mechanism for queuing or adopts a priority mark for queuing.
Referring to fig. 2, the wireless relay system includes a source node S, a relay node R, and a destination node D. Because there is no direct link between the source node and the target node at a longer distance, the source node needs to transmit data to the target node with the assistance of the relay node. Meanwhile, due to the co-channel networking or the channel congestion, the relay node is affected by a plurality of co-channel interference sources (co-channel interference). The invention additionally designs a data buffer zone with limited length at the relay node for data storage and forwarding. When a first hop link (S-to-R link) is activated, the relay node receives and decodes a wireless signal transmitted by a source node, and if the decoding is correct, the decoded data is stored in a buffer area for a second hop; and if the second hop is activated, extracting data from the buffer and transmitting the second hop link.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that are within the spirit and principle of the present invention are intended to be included therein.
Claims (8)
1. A method for wireless relay network interference suppression based on buffering, the method comprising:
step A, a relay node estimates the communication quality of a first hop and a second hop in a communication link to obtain an initial channel quality estimation value; the first hop is a link from a source node to a relay node, and the second hop is a link from the relay node to a target node;
b, the relay node carries out smoothing processing on the initial channel quality estimation value to obtain an average channel quality estimation value;
step C, the relay node judges and determines which hop link in the first hop link and the second hop link is activated according to the average channel quality estimation value;
step D, if the first hop link is judged to be activated, the relay node prepares to receive the wireless signal of the source node, modulates and decodes the received wireless signal, and sends the decoded data to a queue in a buffer area for queuing processing;
step E, if the second hop link is judged to be activated, the relay node extracts the data packet with the highest priority from the queue in the buffer area, modulates and decodes the data packet and then sends the data packet to the target node;
in the step a, the method for estimating the communication quality of the first hop and the second hop in the communication link by the relay node includes: calculating a pilot signal of an uplink by using a channel estimation algorithm to obtain an initial channel quality estimation value; or, obtaining the channel quality through a feedback channel of the source node or the target node to obtain an initial channel quality estimation value.
2. The method of claim 1, wherein the method for the relay node to smooth the initial channel quality estimation value in step B comprises: and carrying out smoothing processing by adopting multiple estimation and averaging or adopting an iterative algorithm.
3. The method according to claim 1, wherein step C specifically comprises: and the relay node judges according to the average channel quality estimated value, if the average channel quality estimated value of the first hop link is larger than the average channel quality estimated value of the second hop link, the first hop link is judged to be activated, otherwise, the second hop link is judged to be activated.
4. The method according to claim 1, wherein step D specifically comprises: if the first hop link is judged to be activated, the relay node prepares to receive the wireless signal of the source node, modulates and decodes the received signal, if the decoding is correct, sends the decoded signal into a queue in a buffer area for queuing processing, and if the decoding fails, the state in the buffer area is kept unchanged.
5. The method according to claim 1, wherein the method for the relay node to queue the decoded data into the queue in the buffer in step D is as follows: and queuing by adopting a first-in first-out mechanism or a priority mark.
6. A wireless relay network interference suppression system based on buffering is characterized in that the system comprises a source node, a relay node and a target node, wireless data transmission is carried out between the source node and the target node through the relay node, the relay node comprises a channel quality estimation module, a statistical processing module, a judgment module, a decoding module, a queuing module, a queue data extraction module and a data transmission module, wherein,
the channel quality estimation module is used for estimating the channel quality of a first hop link between the source node and the relay node and a second hop link between the relay node and the target node to obtain an initial channel quality estimation value, and the channel quality estimation module is electrically connected with the statistical processing module;
the statistical processing module is used for smoothing the initial channel quality estimation value obtained by the channel quality estimation module to obtain an average channel quality estimation value, and the statistical processing module is respectively and electrically connected with the channel quality estimation module and the judgment module;
the decision module is used for deciding which of a first hop link between a source node and a relay node and a second hop link between the relay node and a target node is activated according to the average channel quality estimation value obtained by the statistical processing module, and the decision module is respectively and electrically connected with the statistical processing module, the decoding module and the queue data extraction module;
the decoding module is used for modulating and decoding the received wireless signals transmitted by the source node, and the decoding module is respectively and electrically connected with the judging module and the queuing module;
the queuing module is used for queuing the data decoded by the decoding module, and the queuing module is electrically connected with the decoding module and the queue data extraction module respectively;
the queue data extraction module is used for extracting a data packet with the highest priority from a data queue in the queuing module, and the queue data extraction module is respectively and electrically connected with the judgment module, the queuing module and the data sending module;
the data sending module is used for adjusting and decoding the data packets extracted by the queue data extraction module and then sending the data packets to a target node, and the data sending module is electrically connected with the queue data extraction module.
7. The system of claim 6, wherein the statistical processing module employs a method of averaging multiple estimates or an iterative algorithm to smooth the initial channel quality estimate.
8. The system according to claim 6, wherein the queuing module performs queuing using a first-in-first-out mechanism or queuing using a priority flag.
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| CN104270791A (en) * | 2014-10-15 | 2015-01-07 | 哈尔滨工业大学 | Relay node selecting method assisted by buffer |
| CN106102117A (en) * | 2016-06-13 | 2016-11-09 | 西安交通大学 | Double bounce has safe transmission method based on energy harvesting in buffer network |
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| EP2326030B1 (en) * | 2009-11-23 | 2012-10-17 | Lakeside Labs GmbH | Apparatus and method for cooperative relaying in wireless systems using an extended channel reservation |
| BR112013022300B1 (en) * | 2011-03-03 | 2021-11-09 | Telecom Italia S.P.A. | METHOD FOR SCHEDULING LINK ACTIVATIONS WITHIN A WIRELESS COMMUNICATIONS NETWORK, INTERNAL MEMORY, AND, WIRELESS COMMUNICATIONS NETWORK |
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| CN104270791A (en) * | 2014-10-15 | 2015-01-07 | 哈尔滨工业大学 | Relay node selecting method assisted by buffer |
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