CN108039905B - Method and device for selecting duplex mode of bidirectional relay system based on decoding forwarding - Google Patents
Method and device for selecting duplex mode of bidirectional relay system based on decoding forwarding Download PDFInfo
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/14—Two-way operation using the same type of signal, i.e. duplex
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Abstract
the invention provides a method and a device for selecting duplex mode of a bidirectional relay system based on decoding forwarding, wherein the method comprises the following steps: establishing a two-way relay communication system and detecting the noise spectral density variance of the two-way relay communication system; normalizing the transmission power of the terminal node A, B and the relay node R; when the system works in a full duplex mode, the signal to interference plus noise ratios of the terminal node A, B and the relay node R are respectively calculated; respectively calculating the bit error rate of the node A, B, R according to the signal-to-interference-and-noise ratios of the node A, B and the node R; according to the bit error rate of the terminal node A, B, R, calculating the throughput rate of the bidirectional relay communication system in a full-duplex mode, and calculating the throughput rate of the system in a half-duplex mode; and comparing the throughput rate of the system in the full-duplex mode with the throughput rate of the system in the half-duplex mode, and selecting the duplex mode with higher throughput rate for signal transmission.
Description
Technical Field
the invention relates to the technical field of relay communication, in particular to a method and a device for selecting a duplex mode of a bidirectional relay system based on decoding forwarding.
Background
in the prior art, the terminal node and the relay node in the bidirectional relay communication system generally work in a fixed mode, and either work in a full-duplex mode or a half-duplex mode, so that the duplex mode cannot be automatically adjusted according to the number of bits exchanged by the system. When the system works in a full-duplex mode, one inevitable problem is the influence of self-interference, namely the problem of strong interference from a transmitting antenna of a node to a receiving antenna of the node; when the system works in a half-duplex mode, the spectrum efficiency of the system is low, and the problem is increasingly highlighted under the condition that the spectrum resources are increasingly tense. Therefore, how to automatically adjust the duplex mode of the system becomes a problem which needs to be solved urgently.
Disclosure of Invention
In order to solve the above technical problem, embodiments of the present invention provide a method and an apparatus for selecting a duplex mode of a bidirectional relay system based on decode and forward.
In one aspect, an embodiment of the present invention provides a method for selecting a duplex mode of a bidirectional relay system based on decoding forwarding, where the method includes:
Step 1, establishing a two-way relay communication system, and detecting a noise spectral density variance of the two-way relay communication system; the system comprises two terminal nodes A and B with full-duplex capability and a bidirectional relay node R with full-duplex capability;
Step 2, normalizing the transmission power of the terminal node A, B and the relay node R;
Step 3, when the bidirectional relay communication system works in a full-duplex mode, respectively calculating the SINR of the terminal node A, B and the relay node R according to the self-interference channel gain and the estimated gain between the transmitting antenna and the receiving antenna of the terminal node A, the self-interference channel gain and the estimated gain between the transmitting antenna and the receiving antenna of the terminal node B, the self-interference channel gain and the estimated gain between the transmitting antenna and the receiving antenna of the relay node R, the channel gain between the terminal node A and the relay node R, and the channel gain and the noise spectral density variance between the terminal node B and the relay node R;
Step 4, respectively calculating bit error rates of the terminal node A, B and the relay node R according to the signal-to-interference-and-noise ratios of the terminal node A, B and the relay node R;
Step 5, calculating the throughput rate of the bidirectional relay communication system in the full-duplex mode according to the bit error rates of the terminal node A, B and the relay node R, and calculating the throughput rate of the bidirectional relay communication system in the half-duplex mode;
and 6, comparing the throughput rate of the bidirectional relay system in the full-duplex mode with the throughput rate of the bidirectional relay system in the half-duplex mode, and selecting the duplex mode with higher throughput rate for signal transmission.
on the other hand, an embodiment of the present invention further provides a device for selecting a duplex mode of a bidirectional relay system based on decoding forwarding, where the device includes:
The bidirectional relay system establishing unit is used for establishing a bidirectional relay communication system and detecting the noise spectral density variance of the bidirectional relay communication system; the system comprises two terminal nodes A and B with full-duplex capability and a bidirectional relay node R with full-duplex capability;
A normalization unit configured to normalize transmission power of the terminal node A, B and the relay node R;
A signal-to-interference-and-noise ratio calculation unit, configured to, when the bidirectional relay communication system operates in a full-duplex mode, calculate signal-to-interference-and-noise ratios of the terminal node A, B and the relay node R, respectively, according to a self-interference channel gain and an estimated gain between the terminal node a transmit antenna and the receive antenna, a self-interference channel gain and an estimated gain between the terminal node B transmit antenna and the receive antenna, a self-interference channel gain and an estimated gain between the relay node R transmit antenna and the receive antenna, a channel gain between the terminal node a and the relay node R, and a channel gain and a noise spectral density variance between the terminal node B and the relay node R;
a bit error rate calculating unit, configured to calculate bit error rates of the terminal node A, B and the relay node R according to the sinc-to-lnc-noise ratios of the terminal node A, B and the relay node R, respectively;
A throughput rate calculation unit, configured to calculate, according to bit error rates of the terminal node A, B and the relay node R, a throughput rate of the bidirectional relay communication system in a full-duplex mode, and calculate a throughput rate of the bidirectional relay communication system in a half-duplex mode;
And the duplex mode selection unit is used for comparing the throughput rate of the bidirectional relay system in the full-duplex mode with the throughput rate of the bidirectional relay system in the half-duplex mode, and selecting the duplex mode with higher throughput rate for signal transmission.
By utilizing the method and the device for selecting the duplex mode of the bidirectional relay system based on decoding forwarding, provided by the embodiment of the invention, the throughput rate of the system working in a full-duplex mode can be calculated, and after the throughput rate is compared with the throughput rate in a half-duplex mode, the duplex mode with higher throughput rate is selected, so that the information exchange efficiency of the system can be obviously improved, the system can achieve the optimization of frequency spectrum resources, and meanwhile, the energy consumption is reduced to the maximum extent.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic flowchart of a method for selecting a duplex mode of a bidirectional relay system based on decode and forward according to an embodiment of the present invention;
FIG. 2 is a full duplex two-way channel information exchange model for a two-way relay communication system established in the practice of the present invention;
Fig. 3 is a schematic structural diagram of a duplex mode selection device of a bidirectional relay system based on decode and forward according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
fig. 1 is a flowchart illustrating a method for selecting a duplex mode of a bidirectional relay system based on decode and forward according to an embodiment of the present invention. As shown in fig. 1, the method mainly comprises the following steps:
step 1, establishing a two-way relay communication system, and detecting the noise spectral density variance of the two-way relay communication system. The system is established to comprise two terminal nodes A and B with full-duplex capability and a bidirectional relay node R with full-duplex capability.
Although the node has full-duplex capability, it may select to work in a half-duplex mode, or may select to work in a full-duplex mode, and specifically select which duplex mode, is a technical problem to be solved by the embodiment of the present invention.
step 2, normalizing the transmission power of the terminal node A, B and the relay node R.
and 3, when the bidirectional relay communication system works in a full-duplex mode, respectively calculating the signal-to-interference-and-noise ratios of the terminal node A, B and the relay node R according to the self-interference channel gain and the estimated gain between the transmitting antenna and the receiving antenna of the terminal node A, the self-interference channel gain and the estimated gain between the transmitting antenna and the receiving antenna of the terminal node B, the self-interference channel gain and the estimated gain between the transmitting antenna and the receiving antenna of the relay node R, the channel gain between the terminal node A and the relay node R, and the channel gain and the noise spectral density variance between the terminal node B and the relay node R.
and 4, respectively calculating the bit error rates of the terminal node A, B and the relay node R according to the signal-to-interference-and-noise ratios of the terminal node A, B and the relay node R.
and step 5, calculating the throughput rate of the bidirectional relay communication system in the full-duplex mode according to the bit error rates of the terminal node A, B and the relay node R, and calculating the throughput rate of the bidirectional relay communication system in the half-duplex mode.
And 6, comparing the throughput rate of the bidirectional relay system in the full-duplex mode with the throughput rate of the bidirectional relay system in the half-duplex mode, and selecting the duplex mode with higher throughput rate for signal transmission.
By utilizing the method for selecting the duplex mode of the bidirectional relay system based on decoding forwarding, which is provided by the embodiment of the invention, the throughput rate of the system working in the full-duplex mode can be calculated, and after the throughput rate is compared with the throughput rate in the half-duplex mode, the duplex mode with higher throughput rate is selected, so that the information exchange efficiency of the system can be obviously improved, and the system can achieve the optimization of frequency spectrum resources.
fig. 2 is a full-duplex bidirectional channel information exchange model of a bidirectional relay communication system established in the implementation of the present invention. As shown in FIG. 2, hAfor the channel estimation ratio, h, between terminal node A and terminal node RBFor the channel estimation ratio, h, between terminal node B and relay node RAAFor terminal node A, the self-interference channel estimation ratio, h, between the transmit and receive antennasBBFor the self-interference channel estimation ratio, h, between the transmitting and receiving antennas of the terminal node BRRThe ratio is estimated for the self-interference channel between the transmit antenna and the receive antenna for the relay node R.
Assuming that a data frame includes N bits and is modulated by using a BPSK (Binary Phase Shift Keying) modulation method, if 3 nodes all operate in a full-duplex state, N +1 slots are required to complete bit exchange. In time slot N (N ∈ [2, N)]) Terminal nodes a and B simultaneously transmit signals to relay node R and receive signals broadcast by relay node R containing the contents of the last time slot n-1. With BPSK modulation, the two node exchange containing N bits of information can be mapped into N symbols. By xA(n) denotes the signal transmitted by terminal node A in time slot n, xB(n) denotes the signal transmitted by the terminal node B in time slot n, xR(n) represents the signal transmitted by the relay node R at time slot n, yA(n) denotes the signal received by terminal node A at time slot n, yB(n) denotes the signal received by the terminal node B in time slot n, yR(n) represents a signal received by the relay node R at time slot n.
a data packet containing N bits with a transmission time TsThen its rate is Rs＝N/TsIf the system exchanges N bits, the system data transmission rate is 2Rs. Will be provided withNormalization of the transmission power of 3 nodes, i.e.The normalization factor beta is recorded. Detecting and obtaining the noise spectrum density N of the system when the system node is silent0if the additive white gaussian noise is Z, the mean obedience of the established bidirectional relay communication system is 0, and the variance is N0is normally distributed.
At the terminal node A, B of the bidirectional relay communication system established in the embodiment of the present invention, the signal-to-noise ratio of the two can be expressed as:
Since each node can operate in full duplex mode, the Signal-to-Self-Interference Radio (SSIR) of the end nodes a and B is defined as follows:
In the embodiment of the present invention, the formula for calculating the signal to interference plus noise ratio of each node is as follows:
Since the transmit power of each node in the system has been normalized, i.e., equal, and the transmit power has a large effect on self-interference signal cancellation in full-duplex communication, it can also be assumed that the self-interference signal cancellation capability of each node is equal, i.e., equal
Under a full-duplex decoding and forwarding mechanism, due to the adoption of a physical layer network coding scheme, at a relay node R, the bit error rate can be calculated by the following formula:
Wherein, γ1and gamma2Is the intermediate variable(s) of the variable,
For other cases, i.e. under the decode-and-forward mechanism and under the amplify-and-forward mechanism, the bit error rate of terminal node A, B is the bit error rate of the BPSK modulation scheme:
Wherein Q is a complementary cumulative distribution function. .
Under a Full Duplex decoding and forwarding scheme mechanism (FD-DF), N +1 timeslots can be divided into two parts: 1) n belongs to [2, N ] and comprises N-1 time slots; 2) n-1 and N-N +1, containing 2 time slots. Part 1) N-1 bits can be exchanged between nodes, part 2) 1 bits can be exchanged between nodes. The two fractions were analyzed separately below.
Part 1), the relay node R sends the mixed signal received by the previous node, i.e.
xR(n)＝β[xA(n-1)+xB(n-1)] (9)
Wherein the content of the first and second substances,since the relay node operates in the full duplex mode, the relay node R receives signals while transmitting signals, that is:
For the terminal node, taking terminal node a as an example, in time slot n, the signal received by a is:
for node A, xA(n-1) and xB(n-1) is a useful signal, so that:
also, SINRB＝γB。
Next, the throughput rate of the two-way relay communication system is calculated. The following events are defined:
In N time slots, the terminal node A correctly receives all bits; The complementary event of (a);
in N time slots, the terminal node B correctly receives all bits; The complementary event of (a);
in N time slots, the relay node R correctly receives all bits; The complementary event of (a);
the probability of occurrence of event Ω is denoted by P (Ω). Under the mechanism of the full-duplex decoding forwarding scheme, the following 8 cases can be totally distinguished:
(1) when in useWhen this happens, a total of N-1 bits may be exchanged in N-1 slots.
TABLE 1When it happens, the result
(2) When in usein this case, as shown in Table 2 below, the terminal node A, B can still correctly receive the bits sent by the other side, i.e., N-1 bits can be exchanged in N-1 time slots.
TABLE 2when it happens, the result
(3) When in usewhen this happens, as shown in the table below, terminal node A, B cannot properly receive the other bit in this case;
TABLE 3when it happens, the result
(4) when in useWhen this happens, terminal node A, B cannot properly receive the other bit, as shown in the table below;
TABLE 4when it happens, the result
(5) When in useWhen it happens, only the A node can correctly receive the B transmission content
TABLE 5When it happens, the result
(6) when in useWhen this happens, only the node B can correctly receive the a transmission. As shown in the following table:
TABLE 6When it happens, the result
(7) When in useWhen this happens, only the node B can correctly receive the a transmission as shown in the following table.
TABLE 7when it happens, the result
(8) When in usewhen this happens, only node a can correctly receive the B transmission, as shown in the following table:
TABLE 8When it happens, the result
from the above derivation, then in section 1), the throughput rate of the bidirectional relay communication system is:
in part 2), the system exchanges 1 bit of information in 2 slots, so the throughput rate of this part:
Wherein the content of the first and second substances,
For a full duplex decode-and-forward mechanism, the throughput rate of the system can be written as:
Substituting the signal-to-interference-and-noise ratio and the signal N of the full-duplex node into an equation (19), so as to obtain the system throughput rate of the bidirectional relay communication system in the full-duplex mode, and calculating the system throughput rate of the bidirectional relay communication system in the half-duplex mode by using the existing equation, wherein the system throughput rate in the half-duplex mode is as follows:
The signal-to-interference-and-noise ratio of the half-duplex node (consistent with the signal-to-interference-and-noise ratio in the full-duplex mode) and the signal N are substituted into the formula (20), and the system throughput rate of the bidirectional relay communication system working in the half-duplex mode can be obtained. The system throughput rates under the two duplex modes are compared, the duplex mode with higher throughput rate is selected for signal transmission, and the highest transmission efficiency can be achieved.
Based on the same inventive concept as the decoding forwarding-based duplex mode selection method for the bidirectional relay system shown in fig. 1, an embodiment of the present invention further provides a decoding forwarding-based duplex mode selection device for the bidirectional relay system, as shown in the following embodiments. As the principle of the apparatus for solving the problem is similar to the duplex mode selection method in fig. 1, the apparatus can be implemented by referring to the implementation of the duplex mode selection method of the bidirectional relay system based on decoding and forwarding in fig. 1, and repeated parts are not described again.
In another embodiment, the present invention further provides a duplex mode selection device for a bidirectional relay system based on decode and forward, the structure of which is substantially as shown in fig. 3, and the device mainly includes: the system comprises a bidirectional relay system establishing unit 1, a normalizing unit 2, a signal-to-interference-and-noise ratio calculating unit 3, a bit error rate calculating unit 4, a throughput rate calculating unit 5 and a duplex mode selecting unit 6.
The bidirectional relay system establishing unit 1 is used for establishing a bidirectional relay communication system and detecting a noise spectral density variance of the bidirectional relay communication system; the system comprises two terminal nodes A and B with full-duplex capability and a bidirectional relay node R with full-duplex capability.
the normalization unit 2 is configured to normalize the transmission power of the terminal node A, B and the relay node R.
when the bidirectional relay communication system operates in a full-duplex mode, the sir calculating unit 3 is configured to calculate sirs of the terminal node A, B and the relay node R respectively according to a self-interference channel gain and an estimated gain between the transmitting antenna and the receiving antenna of the terminal node a, a self-interference channel gain and an estimated gain between the transmitting antenna and the receiving antenna of the terminal node B, a self-interference channel gain and an estimated gain between the transmitting antenna and the receiving antenna of the relay node R, a channel gain between the terminal node a and the relay node R, and a channel gain and a noise spectral density variance between the terminal node B and the relay node R.
the bit error rate calculating unit 4 is configured to calculate bit error rates of the terminal node A, B and the relay node R according to the signal to interference plus noise ratios of the terminal node A, B and the relay node R, respectively.
the throughput rate calculation unit 5 is configured to calculate a throughput rate of the bidirectional relay communication system in the full-duplex mode according to the bit error rates of the terminal node A, B and the relay node R, and calculate a throughput rate of the bidirectional relay communication system in the half-duplex mode.
The duplex mode selection unit 6 is configured to compare the throughput rate of the bidirectional relay system in the full-duplex mode with the throughput rate of the bidirectional relay system in the half-duplex mode, and select the duplex mode with a higher throughput rate for signal transmission.
In an embodiment, the sir calculating unit 3 is specifically configured to calculate the sirs of the terminal node A, B and the relay node R respectively according to the following formulas:
Wherein, γA、γB、γRthe signal to interference plus noise ratio of the terminal node A, B and the relay node R, respectively; h isA、hBRespectively the channel gain between the terminal node A and the relay node R and the channel gain between the terminal node B and the relay node R; h isAA、hBB、hRRRespectively obtaining the self-interference channel gain between a sending antenna and a receiving antenna of a terminal node A, the self-interference channel gain between a sending antenna and a receiving antenna of a terminal node B and the self-interference channel gain between a sending antenna and a receiving antenna of a relay end node R;Respectively, self-interference channel estimation gain between terminal node A transmitting antenna and receiving antenna, self-interference channel estimation gain between terminal node B transmitting antenna and receiving antenna, terminal node R transmitting antenna and receiving antennaEstimating gain from interference channel between lines; n is a radical of0is the noise spectral density variance of the two-way relay communication system.
in an embodiment, the bit error rate calculating unit 4 is specifically configured to calculate the bit error rates of the terminal node A, B and the relay node R according to the following formulas:
Wherein the content of the first and second substances,Bit error rates of the terminal node A, B and the relay node R, respectively; gamma ray1and gamma2is the intermediate variable(s) of the variable,γA、γB、γRThe signal to interference plus noise ratio of the end node A, B and the relay node R, respectively.
In an embodiment, when the throughput rate of the bidirectional relay communication system in the full-duplex mode is calculated by using the throughput rate calculating unit 5, the throughput rate of the bidirectional relay communication system in the full-duplex mode may be calculated according to the following formula:
wherein R isFD-DFThe throughput rate of the bidirectional relay communication system in a full duplex mode is achieved; n is the number of bits to be transmitted by the two terminal nodes A and B, RSFor the two-way relay communication system at TsThe rate at which the end node transmits a data packet containing N bits to the relay node R within the time, i.e. the rate
by using the method and the device for selecting the duplex mode of the bidirectional relay system based on decoding forwarding, provided by the embodiment of the invention, the throughput rate of the system working in a full-duplex mode can be calculated, and after the throughput rate is compared with the throughput rate in a half-duplex mode, the duplex mode with higher throughput rate is selected, so that the information exchange efficiency of the system can be obviously improved, and the system can achieve the optimization of frequency spectrum resources.
as will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
these computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The principle and the implementation mode of the invention are explained by applying specific embodiments in the invention, and the description of the embodiments is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (8)
1. a duplex mode selection method of a bidirectional relay system based on decoding forwarding is characterized by comprising the following steps:
Step 1, establishing a two-way relay communication system, and detecting a noise spectral density variance of the two-way relay communication system; the system comprises two terminal nodes A and B with full-duplex capability and a bidirectional relay node R with full-duplex capability;
Step 2, normalizing the transmission power of the terminal node A, B and the relay node R;
Step 3, when the bidirectional relay communication system works in a full-duplex mode, respectively calculating the SINR of the terminal node A, B and the relay node R according to the self-interference channel gain and the estimated gain between the transmitting antenna and the receiving antenna of the terminal node A, the self-interference channel gain and the estimated gain between the transmitting antenna and the receiving antenna of the terminal node B, the self-interference channel gain and the estimated gain between the transmitting antenna and the receiving antenna of the relay node R, the channel gain between the terminal node A and the relay node R, and the channel gain ratio and the noise spectral density variance between the terminal node B and the relay node R;
step 4, respectively calculating bit error rates of the terminal node A, B and the relay node R according to the signal-to-interference-and-noise ratios of the terminal node A, B and the relay node R;
Step 5, calculating the throughput rate of the bidirectional relay communication system in the full-duplex mode according to the bit error rates of the terminal node A, B and the relay node R, and calculating the throughput rate of the bidirectional relay communication system in the half-duplex mode;
And 6, comparing the throughput rate of the bidirectional relay system in the full-duplex mode with the throughput rate of the bidirectional relay system in the half-duplex mode, and selecting the duplex mode with higher throughput rate for signal transmission.
2. The method for selecting duplex mode of bi-directional relay system based on decode-and-forward according to claim 1, wherein when calculating the signal to interference plus noise ratio of the terminal node A, B and the relay node R in step 3, the method specifically comprises:
The signal-to-interference-and-noise ratios of the terminal node A, B and the relay node R are calculated respectively according to the following formula:
wherein, γA、γB、γRthe signal to interference plus noise ratio of the terminal node A, B and the relay node R, respectively; h isA、hBRespectively the channel gain between the terminal node A and the relay node R and the channel gain between the terminal node B and the relay node R; h isAA、hBB、hRRThe self-interference channel gain between the terminal node A transmitting antenna and the receiving antenna, the self-interference channel gain between the terminal node B transmitting antenna and the receiving antenna, the relay node R transmitting antenna and the receiving antennaSelf-interference channel gain between antennas;Respectively obtaining self-interference channel estimation gain between a sending antenna and a receiving antenna of a terminal node A, self-interference channel estimation gain between a sending antenna and a receiving antenna of a terminal node B and self-interference channel estimation gain between a sending antenna and a receiving antenna of a terminal node R; n is a radical of0Is the noise spectral density variance of the two-way relay communication system.
3. The method for selecting duplex mode of bi-directional relay system based on decode-and-forward as claimed in claim 2, wherein when calculating the bit error rate of the end node A, B and the relay node R in step 4, the method specifically comprises:
The bit error rates of the terminal node A, B and the relay node R are calculated according to the following formula:
Wherein the content of the first and second substances,Bit error rates of the terminal node A, B and the relay node R, respectively; gamma ray1and gamma2Is the intermediate variable(s) of the variable,γA、γB、γRThe signal to interference plus noise ratio of the terminal node A, B and the relay node R, respectively; q is the complementary cumulative distribution function.
4. the method for selecting duplex mode of bi-directional relay system based on decode-and-forward as claimed in claim 3, wherein when calculating the throughput rate of the bi-directional relay communication system in full duplex mode by using step 5, the method specifically comprises:
calculating the throughput rate of the bidirectional relay communication system in a full-duplex mode according to the following formula:
Wherein R isFD-DFThe throughput rate of the bidirectional relay communication system in a full duplex mode is achieved; n is the number of bits to be transmitted between the two terminal nodes A and B, RSFor the two-way relay communication system at Tsthe rate at which the end node transmits a data packet containing N bits to the relay node R within the time, i.e. the rate
5. a duplex mode selection device of a bidirectional relay system based on decoding forwarding is characterized by comprising:
the bidirectional relay system establishing unit is used for establishing a bidirectional relay communication system and detecting the noise spectral density variance of the bidirectional relay communication system; the system comprises two terminal nodes A and B with full-duplex capability and a bidirectional relay node R with full-duplex capability;
A normalization unit configured to normalize transmission power of the terminal node A, B and the relay node R;
a signal-to-interference-and-noise ratio calculation unit, configured to, when the bidirectional relay communication system operates in a full-duplex mode, calculate signal-to-interference-and-noise ratios of the terminal node A, B and the relay node R, respectively, according to a self-interference channel gain and an estimated gain between the terminal node a transmit antenna and the receive antenna, a self-interference channel gain and an estimated gain between the terminal node B transmit antenna and the receive antenna, a self-interference channel gain and an estimated gain between the relay node R transmit antenna and the receive antenna, a channel gain between the terminal node a and the relay node R, and a channel gain and a noise spectral density variance between the terminal node B and the relay node R;
A bit error rate calculating unit, configured to calculate bit error rates of the terminal node A, B and the relay node R according to the sinc-to-lnc-noise ratios of the terminal node A, B and the relay node R, respectively;
a throughput rate calculation unit, configured to calculate, according to bit error rates of the terminal node A, B and the relay node R, a throughput rate of the bidirectional relay communication system in a full-duplex mode, and calculate a throughput rate of the bidirectional relay communication system in a half-duplex mode;
And the duplex mode selection unit is used for comparing the throughput rate of the bidirectional relay system in the full-duplex mode with the throughput rate of the bidirectional relay system in the half-duplex mode, and selecting the duplex mode with higher throughput rate for signal transmission.
6. The duplex mode selecting apparatus for bi-directional relay system based on decode-and-forward as claimed in claim 5, wherein said SINR calculating unit is specifically configured to:
the signal-to-interference-and-noise ratios of the terminal node A, B and the relay node R are calculated respectively according to the following formula:
Wherein, γA、γB、γRThe signal to interference plus noise ratio of the terminal node A, B and the relay node R, respectively; h isA、hBrespectively the channel gain between the terminal node A and the relay node R and the channel gain between the terminal node B and the relay node R; h isAA、hBB、hRRself-interference between the transmitting and receiving antennas of terminal node A, respectivelyChannel gain, self-interference channel gain between a terminal node B transmitting antenna and a receiving antenna, and self-interference channel gain between a relay node R transmitting antenna and a receiving antenna;respectively obtaining self-interference channel estimation gain between a sending antenna and a receiving antenna of a terminal node A, self-interference channel estimation gain between a sending antenna and a receiving antenna of a terminal node B and self-interference channel estimation gain between a sending antenna and a receiving antenna of a terminal node R; n is a radical of0Is the noise spectral density variance of the two-way relay communication system.
7. The duplex mode selecting apparatus for a bi-directional relay system based on decode and forward as claimed in claim 6, wherein the bit error rate calculating unit is specifically configured to:
The bit error rates of the terminal node A, B and the relay node R are calculated according to the following formula:
wherein the content of the first and second substances,Bit error rates of the terminal node A, B and the relay node R, respectively; gamma ray1and gamma2is the intermediate variable(s) of the variable,γA、γB、γRthe signal to interference plus noise ratio of the end node A, B and the relay node R, respectively.
8. the apparatus for selecting duplex mode of bi-directional relay system based on decode-and-forward according to claim 7, wherein when the throughput rate calculation unit calculates the throughput rate of the bi-directional relay communication system in full duplex mode, the apparatus specifically comprises:
Calculating the throughput rate of the bidirectional relay communication system in a full-duplex mode according to the following formula:
Wherein R isFD-DFThe throughput rate of the bidirectional relay communication system in a full duplex mode is achieved; n is the number of bits to be transmitted by the two terminal nodes A and B, RSFor the two-way relay communication system at Tsthe rate at which the end node transmits a data packet containing N bits to the relay node R within the time, i.e. the rate
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Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101123608A (en) * | 2007-09-10 | 2008-02-13 | 北京航空航天大学 | Full frequency band and full duplex transmission power adjustable wireless network adapter and its implementation method |
| CN101977103A (en) * | 2010-11-01 | 2011-02-16 | 中国人民解放军信息工程大学 | Implementation method of equivalent full duplex in bidirectional relay network |
| CN102812648A (en) * | 2010-03-11 | 2012-12-05 | 韩国电子通信研究院 | Communication method and frame structure for a coordinator device, source device and relay device in a wireless system |
| CN202841166U (en) * | 2012-10-31 | 2013-03-27 | 惠州市德赛西威汽车电子有限公司 | Network communication equipment |
| WO2014164362A1 (en) * | 2013-03-09 | 2014-10-09 | Harry Stylli | Methods of detecting prostate cancer |
| WO2014189776A1 (en) * | 2013-05-23 | 2014-11-27 | Motorola Solutions, Inc. | Systems and methods for group communication in noisy environments |
| CN104756431A (en) * | 2012-12-03 | 2015-07-01 | 英特尔公司 | Selection of acknowledgment timing in wireless communications |
| CN105050196A (en) * | 2015-07-07 | 2015-11-11 | 上海交通大学 | Multi-user communication scheduling system and method based on full duplex relay caching |
| CN105981457A (en) * | 2014-06-27 | 2016-09-28 | 华为技术有限公司 | Communication method, apparatus and system |
| CN106357377A (en) * | 2016-08-30 | 2017-01-25 | 上海交通大学 | Full-duplex and half-duplex mixed relay implementing method based on diversity gain |
| CN106572490A (en) * | 2016-11-07 | 2017-04-19 | 华南理工大学 | Reception power based duplex manner selection method of cellular communication system |
| CN106603141A (en) * | 2016-12-21 | 2017-04-26 | 北京邮电大学 | Relay and antenna joint selection method for full-duplex bidirectional relay system |
| KR101802078B1 (en) * | 2016-06-20 | 2017-11-28 | 세종대학교산학협력단 | Wireless communication system using variable full-duplex and method for improving communication performance using the same |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101527977B1 (en) * | 2008-10-27 | 2015-06-15 | 엘지전자 주식회사 | Method of operating relay in wireless communication system |
| US20170170946A1 (en) * | 2015-12-15 | 2017-06-15 | Intel Corporation | Selective participation on full-duplex communications |
-
2017
- 2017-12-20 CN CN201711383088.XA patent/CN108039905B/en active Active
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101123608A (en) * | 2007-09-10 | 2008-02-13 | 北京航空航天大学 | Full frequency band and full duplex transmission power adjustable wireless network adapter and its implementation method |
| CN102812648A (en) * | 2010-03-11 | 2012-12-05 | 韩国电子通信研究院 | Communication method and frame structure for a coordinator device, source device and relay device in a wireless system |
| CN101977103A (en) * | 2010-11-01 | 2011-02-16 | 中国人民解放军信息工程大学 | Implementation method of equivalent full duplex in bidirectional relay network |
| CN202841166U (en) * | 2012-10-31 | 2013-03-27 | 惠州市德赛西威汽车电子有限公司 | Network communication equipment |
| CN104756431A (en) * | 2012-12-03 | 2015-07-01 | 英特尔公司 | Selection of acknowledgment timing in wireless communications |
| WO2014164362A1 (en) * | 2013-03-09 | 2014-10-09 | Harry Stylli | Methods of detecting prostate cancer |
| WO2014189776A1 (en) * | 2013-05-23 | 2014-11-27 | Motorola Solutions, Inc. | Systems and methods for group communication in noisy environments |
| CN105981457A (en) * | 2014-06-27 | 2016-09-28 | 华为技术有限公司 | Communication method, apparatus and system |
| CN105050196A (en) * | 2015-07-07 | 2015-11-11 | 上海交通大学 | Multi-user communication scheduling system and method based on full duplex relay caching |
| KR101802078B1 (en) * | 2016-06-20 | 2017-11-28 | 세종대학교산학협력단 | Wireless communication system using variable full-duplex and method for improving communication performance using the same |
| CN106357377A (en) * | 2016-08-30 | 2017-01-25 | 上海交通大学 | Full-duplex and half-duplex mixed relay implementing method based on diversity gain |
| CN106572490A (en) * | 2016-11-07 | 2017-04-19 | 华南理工大学 | Reception power based duplex manner selection method of cellular communication system |
| CN106603141A (en) * | 2016-12-21 | 2017-04-26 | 北京邮电大学 | Relay and antenna joint selection method for full-duplex bidirectional relay system |
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