CN110099386B - Wireless relay method independent of non-causal information in cognitive network - Google Patents
Wireless relay method independent of non-causal information in cognitive network Download PDFInfo
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- CN110099386B CN110099386B CN201910304754.9A CN201910304754A CN110099386B CN 110099386 B CN110099386 B CN 110099386B CN 201910304754 A CN201910304754 A CN 201910304754A CN 110099386 B CN110099386 B CN 110099386B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
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Abstract
The invention provides a wireless relay method independent of non-causal information in a cognitive network, which adopts a slave user as a relay node to provide help for communication of a master user, and reduces the interruption probability of the master user; the method of interference alignment neutralization is adopted to utilize the interference signal from the master user received during the communication of the slave user so as to achieve the purpose of relaying the master user; by reusing the interference signals of the slave users, the interference neutralization is realized among the slave users by adopting a cooperative precoding mode, so that the relay signals are free of interference when reaching the receiving end of the master user. The invention has the beneficial effects that: the technical scheme provided by the invention can reduce the interruption probability of the master user under the condition that the information sent by the slave user to the master user is completely unknown, and does not depend on the non-causal master user information; the slave user does not need to wait for the master user to transmit a sending signal to realize data sharing, so that the aim of relaying the master user is fulfilled.
Description
Technical Field
The invention relates to the field of relay communication, in particular to a wireless relay method independent of non-causal information in a cognitive network.
Background
The Cognitive Radio (CR) realizes intelligent spectrum sharing based on dynamic spectrum allocation, and can greatly improve the spectrum utilization rate. A secondary user should be able to reliably sense the surrounding spectrum environment, accurately detect the sideband information of the legitimate primary user, adaptively adjust the transmission parameters for communication, and ensure that the primary user is not degraded in the whole communication process. However, since the secondary user's perception of the primary user is based on feedback and the symmetry of the wireless link, the uncertainty of the wireless link makes the secondary user's perception of the primary user less than perfect, and therefore, the secondary user's communication inevitably impacts the performance of the primary user's communication in practical applications. How to eliminate this effect becomes one of the hot spots in cognitive radio research.
The cognitive network of Overlay assumes that a secondary user non-causally perceives the transmission information of a primary user before the primary user transmits the information, so many studies in Overlay CR use a cooperative coding method to give a certain compensation to the primary user, so that the communication performance of the primary user is not affected in the presence of the secondary user. However, these methods are all established under the precondition that the secondary user successfully perceives the information of the primary user, such precondition brings great problems to the information security of the primary user, and the process of obtaining the information of the primary user is also non-causal for the secondary user, so that it is difficult to apply the methods to the actual system. In case primary user information is not perceived, for example: in the cognitive network of underlay, how to realize the compensation of the secondary users to the communication performance of the primary users is still a problem to be researched.
Disclosure of Invention
In order to solve the above problems, the present invention provides a wireless relay method independent of non-causal information in a cognitive network.
A wireless relay method independent of non-causal information in a cognitive network is applied to a cognitive radio system, and the cognitive radio system comprises the following steps: a master user transmitting terminal PT, a master user receiving terminal PR, a first slave user transmitting terminal ST1, a first slave user receiving terminal SR1, a second slave user transmitting terminal ST2 and a second slave user receiving terminal SR 2; the wireless relay method independent of non-causal information in the cognitive network is characterized by comprising the following steps:
s101: a master user transmitting terminal PT sends a message packet to a master user receiving terminal PR in a broadcasting mode, and meanwhile, a first slave user transmitting terminal ST1 and a second slave user transmitting terminal ST2 respectively send a first message packet and a second message packet to a first slave user receiving terminal SR1 and a second slave user receiving terminal SR 2;
s102: is PR received the message packet sent by PT? If yes, go to step S103; otherwise, go to step S104;
s103: the PR sends acknowledgement receiving signals ACK to the PT, SR1 and SR2 in a broadcasting mode; after receiving the acknowledgement signal ACK, the SR1 and the SR2 decode the required signal and discard the received other data packets, and the PT receives the acknowledgement signal ACK and prepares a message packet for next communication; and returns to step S101;
s104: the PR sends a reception failure signal NAK to the PT, the SR1 and the SR2 in a broadcasting mode;
s105: after receiving the reception failure signal NAK, the SR1 decodes the first message packet sent by ST1, reserves the message packet sent by the PT and the second message packet sent by ST2, and takes the second message packet and the message packet together as a first relay signal; after receiving the reception failure signal NAK, SR2 decodes the second message packet sent by ST2, and uses the first message packet sent by ST1 and the message packet sent by PT together as a second relay signal; and SR1 and SR2 will transmit relay preparation signal CTR to ST1 and ST2, respectively, to inform ST1 and ST2, respectively, to suspend transmitting data;
s106: the PT sends the message packet to the PR again in a broadcasting mode; meanwhile, SR1 and SR2 transmit the first relay signal and the second relay signal to a main PR, respectively;
s107: the PR removes a first message packet in the second relay signal and a second message packet in the first relay signal by adopting an interference alignment neutralization method, and decodes and reserves the received first relay signal, the second relay signal and the message packet in the message packet so as to achieve the purpose of signal relay enhancement;
s108: is PR received the message packet sent by PT? If yes, return to step S103; otherwise, the PR sends a reception failure signal NAK to the PT, the SR1 and the SR2 in a broadcasting way; and returns to step S106.
Further, in step S102, the PR successfully decodes the message packet sent by the PT, i.e., the message packet sent by the PT is received by the PR.
Further, in step S103, after receiving the ACK signal, SR1 and SR2 decode the required signal, and discard the remaining received data packets, specifically: SR1 decodes the first message packet sent by ST1, discards the message packet sent by PT and the second message packet sent by ST2, SR2 decodes the second message packet sent by ST2, and discards the message packet sent by PT and the first message packet sent by ST 1.
Further, in step S108, after the PR transmits a reception failure signal NAK to SR1 and SR2 in a broadcast manner, ST1 and ST2 suspend transmission of a message packet for the next round of communication.
The technical scheme provided by the invention has the beneficial effects that: the technical scheme provided by the invention can reduce the interruption probability of the master user under the condition that the information sent by the slave user to the master user is completely unknown, and does not depend on the non-causal master user information; different from the previous relay strategy, the slave user does not need to wait for the master user to transmit a sending signal to realize data sharing so as to achieve the purpose of relaying the master user; the method not only can effectively reduce the interruption probability of the master user, but also can well ensure that the communication performance of the master user is not influenced by the slave user when the transmission power of the communication signal of the slave user is not higher than 10 dB.
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The invention will be further described with reference to the accompanying drawings and examples, in which:
fig. 1 is a flowchart of a wireless relay method independent of non-causal information in a cognitive network according to an embodiment of the present invention;
FIG. 2 is a schematic model diagram of a cognitive radio system according to an embodiment of the present invention;
fig. 3 is a communication state transition diagram of a wireless relay method independent of non-causal information in a cognitive network according to an embodiment of the present invention.
Detailed Description
For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
The embodiment of the invention provides a wireless relay method independent of non-causal information in a cognitive network.
Referring to fig. 1, fig. 1 is a flowchart of a wireless relay method independent of non-causal information in a cognitive network according to an embodiment of the present invention, and the method is applied to a cognitive radio system shown in fig. 2, where the cognitive radio system includes: a master user transmitting terminal PT, a master user receiving terminal PR, a first slave user transmitting terminal ST1 (slave user 1 transmitting terminal), a first slave user receiving terminal SR1 (slave user 1 receiving terminal), a second slave user transmitting terminal ST2 (slave user 2 transmitting terminal) and a second slave user receiving terminal SR2 (slave user 2 receiving terminal); the wireless relay method independent of non-causal information in the cognitive network is characterized by comprising the following steps:
s101: a master user transmitting terminal PT sends a message packet to a master user receiving terminal PR in a broadcasting mode, and meanwhile, a first slave user transmitting terminal ST1 and a second slave user transmitting terminal ST2 respectively send a first message packet and a second message packet to a first slave user receiving terminal SR1 and a second slave user receiving terminal SR 2;
s102: is PR received the message packet sent by PT? If yes, go to step S103; otherwise, go to step S104;
s103: the PR sends acknowledgement receiving signals ACK to the PT, SR1 and SR2 in a broadcasting mode; after receiving the acknowledgement signal ACK, the SR1 and the SR2 decode the required signal and discard the received other data packets, and the PT receives the acknowledgement signal ACK and prepares a message packet for next communication; and returns to step S101;
s104: the PR sends a reception failure signal NAK to the PT, the SR1 and the SR2 in a broadcasting mode;
s105: after receiving the reception failure signal NAK, the SR1 decodes the first message packet sent by ST1, reserves the message packet sent by the PT and the second message packet sent by ST2, and takes the second message packet and the message packet together as a first relay signal; after receiving the reception failure signal NAK, SR2 decodes the second message packet sent by ST2, and uses the first message packet sent by ST1 and the message packet sent by PT together as a second relay signal; and SR1 and SR2 will transmit relay preparation signal CTR to ST1 and ST2, respectively, to inform ST1 and ST2, respectively, to suspend transmitting data;
s106: the PT sends the message packet to the PR again in a broadcasting mode; meanwhile, SR1 and SR2 transmit the first relay signal and the second relay signal to a main PR, respectively;
s107: the PR removes a first message packet in the second relay signal and a second message packet in the first relay signal by adopting an interference alignment neutralization method, and decodes and reserves the received first relay signal, the second relay signal and the message packet in the message packet so as to achieve the purpose of signal relay enhancement;
s108: is PR received the message packet sent by PT? If yes, return to step S103; otherwise, the PR sends a reception failure signal NAK to the PT, the SR1 and the SR2 in a broadcasting way; and returns to step S106.
In step S102, the PR successfully decodes the message packet sent by the PT, i.e., the PR receives the message packet sent by the PT.
In step S103, after receiving the ACK, SR1 and SR2 decode the required signal, and discard the remaining received data packets, specifically: SR1 decodes the first message packet sent by ST1, discards the message packet sent by PT and the second message packet sent by ST2, SR2 decodes the second message packet sent by ST2, and discards the message packet sent by PT and the first message packet sent by ST 1.
In step S108, after the PR transmits a reception failure signal NAK to SR1 and SR2 in a broadcast manner, ST1 and ST2 suspend transmission of a message packet for the next round of communication.
In step S107, the method for removing the first message packet in the second relay signal and the second message packet in the first relay signal by the PR using the interference alignment neutralization method, and decoding and retaining the received first relay signal, the second relay signal, and the message packet in the message packet includes:
to enable relaying and maximize the signal-to-noise ratio received by primary users, precoding vectors v are employed when SR1 and SR2 act as relay nodes1And v2；
When the first relay signal, the second relay signal and the message packet arrive at PR, the PR receives the signal
Comprises the following steps:
in the above formula, the first and second carbon atoms are,the first term on the right of the equal sign is a useful signal, the second term and the third term are interference signals, and the fourth term is noise; wherein, PpAnd PrTransmission power of the primary user transmitting terminal PT and relay transmission power of the secondary user transmitting terminals (ST1 and ST2), respectively;
and
respectively representing the channel between PT and PR, the channel between SR1 and PR, and the channel between SR2 and PR in the t-slot; x is the number ofp、xr1And xr2Respectively a transmission signal of PT, a relay signal of SR1 and a relay signal of SR 2; n is0Is gaussian white noise;
order the precoding vector v1And v2Respectively, to maximize the signal-to-noise ratio of the desired signal and to neutralize the interference term:
in the above formula, dp1、d12And dp2Distances between the master user and the first slave user, between the first slave user and the second slave user, and between the master user and the second slave user, respectively; α is a parameter of channel attenuation with distance (in the embodiment of the present invention, the value is 2); psTransmitting power of the first and second slave users in t-1 time slot; beta is a normalization coefficient (preset value) of the pre-coding vector; channels without superscript r represent channels that are t-1 slots: h is1pThe channel between SR1 and PT for the t-1 slot. h is12The channel between SR1 and ST2 which is a t-1 slot.
Referring to fig. 3, fig. 3 is a communication state transition diagram of a wireless relay method independent of non-causal information in a cognitive network according to an embodiment of the present invention; as shown in fig. 3, a primary user pair and a secondary user pair communicate simultaneously during a t-1 time slot. If the PR decodes successfully, it issues an ACK. Upon receiving the ACK, the secondary user receiver SR will decode the desired signal and discard the remaining packets received, this time in a normal communication state S0. Then, all PTs, ST1, and ST2 are ready to send new message packets; wherein PT and PR form a master user pair; ST1 and SR1, ST2 and SR2 constitute two secondary user pairs, respectively;
if PR fails to decode, PR sends out NAK, received by PT, SR1 and SR2 simultaneously, secondary user receiver SR decodes own required signal and stores the rest of received signal ("interference") in its buffer, and SR1 and SR2 will send "Relay preparation" (CTR) signals to ST1 and ST2, respectively; this time, relay communication state S1;
in time slot t, the PT resends the message packet to the PR. If there is a secondary user receiver that transmitted a CTR, the secondary user receiver SR that transmitted the CTR will transmit the "interference" stored in its buffer as its relayed signal in this time slot. The primary user receiver PR receives signals from SR and PT by means of combined reception.
The performance of the method A provided by the invention in the Rayleigh channel and the UWB channel is simulated by the Monte Carlo method, and the effect can be verified.
The invention has the beneficial effects that: the technical scheme provided by the invention can reduce the interruption probability of the master user under the condition that the information sent by the slave user to the master user is completely unknown, and does not depend on the non-causal master user information; different from the previous relay strategy, the slave user does not need to wait for the master user to transmit a sending signal to realize data sharing so as to achieve the purpose of relaying the master user; the method not only can effectively reduce the interruption probability of the master user, but also can well ensure that the communication performance of the master user is not influenced by the slave user when the transmission power of the communication signal of the slave user is not higher than 10 dB.
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 fall within the spirit and principle of the present invention are intended to be included therein.
Claims (3)
1. A wireless relay method independent of non-causal information in a cognitive network is applied to a cognitive radio system, and the cognitive radio system comprises the following steps: a master user transmitting terminal PT, a master user receiving terminal PR, a first slave user transmitting terminal ST1, a first slave user receiving terminal SR1, a second slave user transmitting terminal ST2 and a second slave user receiving terminal SR 2; the wireless relay method independent of non-causal information in the cognitive network is characterized by comprising the following steps:
s101: a master user transmitting terminal PT sends a message packet to a master user receiving terminal PR in a broadcasting mode, and meanwhile, a first slave user transmitting terminal ST1 and a second slave user transmitting terminal ST2 respectively send a first message packet and a second message packet to a first slave user receiving terminal SR1 and a second slave user receiving terminal SR 2;
s102: whether the PR receives the message packet sent by the PT or not; if yes, go to step S103; otherwise, go to step S104;
s103: the PR sends acknowledgement receiving signals ACK to the PT, SR1 and SR2 in a broadcasting mode; after receiving the acknowledgement signal ACK, the SR1 and the SR2 decode the required signal and discard the received other data packets, and the PT receives the acknowledgement signal ACK and prepares a message packet for next communication; and returns to step S101;
s104: the PR sends a reception failure signal NAK to the PT, the SR1 and the SR2 in a broadcasting mode;
s105: after receiving the reception failure signal NAK, the SR1 decodes the first message packet sent by ST1, reserves the message packet sent by the PT and the second message packet sent by ST2, and takes the second message packet and the message packet together as a first relay signal; after receiving the reception failure signal NAK, SR2 decodes the second message packet sent by ST2, and uses the first message packet sent by ST1 and the message packet sent by PT together as a second relay signal; and SR1 and SR2 will transmit relay preparation signals CTR to ST1 and ST2, respectively, to inform ST1 and ST2 to suspend transmitting data, respectively;
s106: the PT sends the message packet to the PR again in a broadcasting mode; meanwhile, SR1 and SR2 transmit the first relay signal and the second relay signal to a main PR, respectively;
s107: the PR removes a first message packet in the second relay signal and a second message packet in the first relay signal by adopting an interference alignment neutralization method, and decodes and reserves the received first relay signal, the second relay signal and the message packet in the message packet so as to achieve the purpose of signal relay enhancement;
s108: whether the PR receives the message packet sent by the PT or not; if yes, return to step S103; otherwise, the PR sends a reception failure signal NAK to the PT, the SR1 and the SR2 in a broadcasting way; and returns to step S106;
in step S103, after receiving the ACK, SR1 and SR2 decode the required signal, and discard the remaining received data packets, specifically: SR1 decodes the first message packet sent by ST1, discards the message packet sent by PT and the second message packet sent by ST2, SR2 decodes the second message packet sent by ST2, and discards the message packet sent by PT and the first message packet sent by ST 1.
2. The wireless relay method independent of non-causal information in a cognitive network as claimed in claim 1, wherein: in step S102, the PR successfully decodes the message packet sent by the PT, i.e., the PR receives the message packet sent by the PT.
3. The wireless relay method independent of non-causal information in a cognitive network as claimed in claim 1, wherein: in step S108, after the PR transmits a reception failure signal NAK to SR1 and SR2 in a broadcast manner, ST1 and ST2 suspend transmission of a message packet for the next round of communication.
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| CN104125577B (en) * | 2014-07-02 | 2017-09-26 | 上海师范大学 | A kind of interference management strategy under cognitive double-deck heterogeneous network system |
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