CN110366234A - A kind of rate dividing method suitable for non-orthogonal multiple uplink - Google Patents
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- H—ELECTRICITY
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Abstract
Rate dividing method suitable for non-orthogonal multiple uplink of the invention carries out signal rate partition to a user first, the signal of another user is decoupled without rate, is split user and forms two Virtual User；It is that two Virtual User distribute different transmission powers, two Virtual User and the user not being split with different transmission power transmission signals using power allocation factor；Access point recovers the signal that the signal for not being split user's transmission and two Virtual User are sent using successive interference cancellation method SIC, and the signal for decoupling preceding user is recovered according to the signal of two Virtual User.Rate dividing method of the invention can effectively reduce the outage probability of user in non-orthogonal multiple uplink Transmission system, ensure that the reliable rate of user uplink data due to having used the synergy of rate partition and power distribution.
Description
Technical Field
The present invention relates to a rate demultiplexing method for a non-orthogonal multiple access uplink, and more particularly, to a rate demultiplexing method for a non-orthogonal multiple access uplink, which performs rate demultiplexing on a signal of a user and then performs signal recovery at an access point.
Background
Non-orthogonal multiple access (NOMA) is considered one of the most important multiple access means in 6G wireless communication networks due to the large-scale interconnection that can provide high spectral efficiency. By means of superposition coding and Successive Interference Cancellation (SIC) in the power domain, the NOMA domain NOMA can access signals of a plurality of users on the same time, frequency and code resource. Rate splitting techniques have received some attention in the wireless communication field in view of the ability to distribute different service information to multiple users. In the existing rate splitting technology, the information of each user is split into public information and private information, and all user receiving ends can decode the private information; in the NOMA uplink transmission system, the rate splitting is adopted to generate complex transmission power distribution along with the power domain superposition coding, so that the corresponding rate splitting is difficult to realize. In the present invention, the inventor proposes a rate splitting method considering back-off power control for a NOMA uplink transmission system, in which, under the condition of considering back-off power control, the transmission power is distributed among split data streams, so that the rate splitting and the power distribution jointly act, and the effect of reducing the probability of system interruption is achieved.
Disclosure of Invention
The present invention provides a rate splitting method suitable for non-orthogonal multiple access uplink to overcome the drawbacks of the above technical problems.
The rate splitting method applicable to the non-orthogonal multiple access uplink is characterized by being realized by the following steps: for an uplink transmission system serving two users, firstly, one of the two users is subjected to signal rate splitting, the signal of the other user is not split, and the split user forms two virtual users; then, different transmitting powers are distributed to the two virtual users by using the power distribution factor, and the two virtual users and the users which are not split transmit signals at different transmitting powers; and finally, the access point receiver adopts a Successive Interference Cancellation (SIC) method to recover the signals sent by the users which are not split and the signals sent by the two virtual users, and recovers the signals of the users before splitting according to the signals of the two virtual users.
The rate splitting method suitable for the non-orthogonal multiple access uplink is realized by the following steps:
a) rate splitting, for a NOMA uplink transmission system serving two users, comprising an access point and two users U1、U2The two users comprise a near user and a far user, and the user U is recordediThe small scale fading of the channel to the access point is hiLarge scale fading of channel is LiI is 1, 2; user U1、U2Respectively, is denoted as x1、x2；
Selecting a user U1Rate splitting, user U1Uplink signal x of1Is split into data streams x11、x12Splitting the signal x11、x12The two corresponding virtual users are respectively marked as U11、U12；
b) Computing a superimposed signal, in the power domain, the split data stream x11And x12The resulting superimposed signal d is:
in the formula, P1Is a user U1α is a power allocation factor;
c) find the received signal, during the uplink transmission, two users U1、U2And simultaneously transmitting signals to the access point, wherein the signals y received by the access point receiver are:
in the formula,P2for user U2N is a noise signal;
d) determining the transmission power of the user, when using compensatory power control, in order to ensure that the access point receiver uses successive interference cancellation SIC to process the required power difference between the user signals, user UiTransmit power P ofiIt should satisfy:
in the formula, PtIs the target power of the received signal required by the access point,is the power step factor used to compensate for power control;
e) uplink signalling, user U1According to the transmission power P1And splitting the signal x11、x12The power division factor alpha of, user U2According to the transmission power P2And sending the signal.
The invention relates to a rate splitting method suitable for a non-orthogonal multiple access uplink, which is realized by the following steps:
1) first, the signal x is recovered11After the receiver of the access point receives the signal y, the continuous interference elimination method SIC is adopted to firstly recover the U1Split signal x of11From equation (2), the pair x11The received signal-to-noise ratio for detection is:
where P ═ P1L2/σ2，σ2In order to be able to measure the power of the noise,and satisfies 0 < epsilon < 1;
after recovering signal x11And subtracted from the received signal shown in equation (2), the remaining signal is used to recover x2The remaining signals are represented as:
2) secondly, recover the signal x2Signal x11After recovery, signal x is recovered2From scratchEquation (5) can be obtained for the signal x2The received signal-to-noise ratio for detection is:
after recovering signal x2And subtracted from the received signal shown in equation (5), the remaining signal is used to recover x12The remaining signals are represented as:
3) finally, the signal x is recovered12Signal x11After recovery, signal x is recovered12From equation (7), the signal x can be obtained2The received signal-to-noise ratio for detection is:
γ12＝(1-α)ρ|h1|2 (8)
signal x recovered by receiver of receiving point11And x12For recovering x1。
The invention is suitable for the speed splitting method of the non-orthogonal multiple access uplink, the relation between the target transmission speed and the power distribution factor is obtained by the following method:
let user U1、U2Are respectively expressed asAndthen x is correctly decoded1And x2The required threshold values of the signal-to-noise ratio are respectivelyAndfor data stream x after rate splitting11、x12Target transmission rates are respectivelyAndwhere β is the rate splitting factor, then the signal x is correctly decoded11And x12The required threshold values of the signal-to-noise ratio are respectivelyAnd
namely, the requirements are as follows:
thus, when a user transmit power P of a NOMA uplink transmission system serving two usersiPower distribution factor alpha, channel small-scale fading hiLarge scale fading L of channeliRate split factor beta, power step factorAfter the determination, the user U can be identified1、U2The outage probability of (2) is analyzed.
The invention has the beneficial effects that: the invention is suitable for the speed of the non-orthogonal multiple access up-link to split the method, for an up-link transmission system which serves two users, carry on the signal speed to split to a user, form 2 virtual users, 2 virtual users and users not split upload the signal with different power, make the access point receiver can resume the signal that the user sent not split and two virtual users send accurately, and can resume the signal of the user before splitting according to two virtual users, because of using the joint action of speed splitting and power allocation, can reduce the probability of interruption of the user in the up-link transmission system effectively, have guaranteed the reliable speed of the up-link data of the user.
Drawings
Fig. 1 is a schematic diagram of a NOMA uplink transmission system serving two users;
FIG. 2 is a schematic structural diagram of a functional module of a user transmitting end in the present invention;
FIG. 3 is a schematic diagram of a successive interference cancellation method SIC of a receiver according to the present invention;
FIG. 4 is a schematic diagram illustrating the effect of signal-to-noise ratio on outage probability when the rate splitting method of the present invention is employed;
FIG. 5 is a schematic diagram illustrating the impact of target transmission rate on the outage probability when the rate splitting method of the present invention is employed;
FIG. 6 is a schematic diagram illustrating the impact of rate splitting factors on outage probability when the rate splitting method of the present invention is employed;
fig. 7 is a schematic diagram illustrating the effect of power allocation factors on outage probability when the rate splitting method of the present invention is employed.
Detailed Description
The invention is further described with reference to the following figures and examples.
Referring to fig. 1, a schematic diagram of a NOMA uplink transmission system for two serving users is shown, which includes an access point, a near user U1And a remote user U2. Without loss of generality, will be subordinate to user Ui(i ═ 1 or 2) channel small-scale fading to access point is denoted as hiWill be reacted with hiThe corresponding large scale fading path loss is noted as Li. In addition, user UiThe signal of (i ═ 1 or 2) is denoted as xi. In consideration of the compensatory power control, the rate-splitting user performs power allocation on the split data stream by using a power allocation factor. The speed splitting method provided by the invention not only realizes the speed splittingRate splitting may be performed at the near user or at the far user. When a certain user performs rate splitting, the structure of the transmitter functional module of the user is as shown in fig. 2, after signal source information processing and signal modulation are performed on a signal to be uploaded, the signal is subjected to rate splitting and power domain superposition coding, and finally, after frequency mixing and radio frequency processing, the signal is transmitted by a transmitting antenna. In the following description of the rate splitting method of the present invention, rate splitting is only performed for the near user as an example, and rate splitting is performed for the far user in a manner similar to that performed for the near user.
When near user U is selected1Information signal x of near user when rate splitting is performed1Is split into data streams x11And x12Corresponding to two virtual users U respectively11And U12. In the power domain, the superimposed signal d generated by the split data stream is:
wherein, P1Is a user U1α is a power allocation factor;
during uplink transmission, two users transmit signals to the access point at the same time, and the signals received by the access point can be expressed as:
wherein,P2for user U2N is a noise signal;
to ensure power differences between user signals required for SIC processing by the access point receiver, user U may be determined when employing compensatory power controliThe transmission power of (a) is:
wherein, PtIs the target power of the received signal required by the access point,is the power step factor used to compensate for the power control.
Considering the split signal for three users U11、U12And U2The access point receiver recovers the signal x using successive interference cancellation SIC11、x12And x2. The decoding order used in the method described in this invention is x11→x2→x12I.e. the decoding order of the signals of the users without rate splitting is in the second place, as shown in fig. 3, a schematic diagram of the successive interference cancellation method SIC of the receiver of the present invention is given.
On the basis of equation (2), the pair x can be deduced11The received signal-to-interference-and-noise ratio for detection is:
where P ═ P1L2/σ2，σ2In order to be able to measure the power of the noise,and satisfies the condition that epsilon is more than 0 and less than or equal to 1.
After recovering signal x11And subtracted from the signal shown in equation (2), the remaining signal is used to recover x2The remaining signals can be expressed as:
according to the formula (5), for x2The received signal to interference plus noise ratio for detection can be expressed as:
by detecting x2By subtracting the signal represented by the formula (5), the remainder is used to detect x12The signal of (d) may be expressed as:
according to the formula (6), for x12The received signal-to-noise ratio for detection can be expressed as
γ12＝(1-α)ρ|h1|2 (8)
Pair x obtained after SIC processing at the receiver of the access point11And x12Will be used to recover x1。
User U1And U2Are respectively expressed asAndthen x is correctly decoded1And x2The desired signal-to-noise threshold value may be expressed asAndfor the data amount x after rate splitting11And x12The target transmission rates of the two can be expressed asAndwhere β is the rate splitting factor, then x is correctly decoded11And x12The desired SNR threshold may be expressed asAnd
the rate splitting method has good interrupt performance and has better interrupt performance compared with a NOMA uplink transmission scheme without rate splitting. This section verifies the probability of disruption of NOMA uplink transmission caused by the rate splitting method set forth in the present invention through simulation. As an example, this section only shows the user U being near1And (4) processing a simulation result of rate splitting. Assuming that the distances from the near user and the far user to the access point are 50m and 100m respectively, the target received signal-to-noise ratio is defined as rhot＝Pt/σ2。
As shown in FIG. 4, a schematic diagram showing the influence of the SNR on the outage probability when the rate splitting method of the present invention is used is shown, and in the simulation corresponding to FIG. 4, the set parameters are β ═ 0.01 and α ═ 0.9. The results of fig. 4 show that: in case of using the rate splitting method, the user U1And U2The outage probability decreases with increasing signal-to-noise ratio. In the case of using the rate splitting method, although the user U1The outage probability of (2) is higher in the medium-low signal-to-noise interval than in the case where no rate splitting method (NOMA) is used; but in the high signal-to-noise ratio interval, compared with the method without rate splitting (NOMA), the method using rate splitting can effectively reduce the U of the user1The probability of interruption of. For user U2Using the rate splitting method can achieve a lower outage probability over the entire snr interval than without the rate splitting method (NOMA).
FIG. 5 shows the target transmission rateAs a result of the influence on the interruption probability, in the simulation corresponding to FIG. 5, the simulation parameter is set to ρt＝20dB、β＝0.01、Andas shown in fig. 5, at the entire target transmission rateThe interval of (2) using the rate splitting method can effectively reduce the outage probability of the user compared to the interval without the rate splitting method (NOMA).
FIG. 6 shows the effect of the rate split factor β on the interrupt probability, and in the simulation corresponding to FIG. 6, the set simulation parameter is ρt＝20dB、And α ═ 0.9. In the medium-low beta interval, a lower outage probability is achieved using the rate splitting method than without the rate splitting method (NOMA). In addition, as β increases, the probability of interruption obtained using the rate splitting method decreases first; after β reaches a threshold value, the corresponding probability of interruption increases with increasing β.
Fig. 7 shows the effect of the power allocation factor a on the outage probability. In the simulation corresponding to fig. 7, simulation parameters were set asbps/Hz、β＝0.1、And ρt20 dB. The results of fig. 7 show that the rate splitting method is applied to user U1And U2Has different influence trend on the interruption probability of the user U1When the rate splitting method is used, the break probability is firstly reduced along with the increase of alpha; at alpha toAfter a threshold value, the corresponding outage probability increases with an increase in α. For user U2When using the rate splitting method, its outage probability always decreases with an increase in α. The results of fig. 7 also show that: in the interval where alpha is in a larger value, the use of the rate splitting method can effectively reduce the interruption probability of the user compared with the use of no rate splitting method (NOMA).
In summary, the rate splitting method applicable to the non-orthogonal multiple access uplink of the present invention performs rate splitting at the transmitting end of the near user or the far user, and the receiver end of the access point recovers the user signal by using the SIC, and the described rate splitting method achieves a lower outage probability compared to the NOMA uplink transmission without the rate splitting method.
Claims (4)
1. A method for rate splitting for a non-orthogonal multiple access uplink, the method comprising: for an uplink transmission system serving two users, firstly, one of the two users is subjected to signal rate splitting, the signal of the other user is not split, and the split user forms two virtual users; then, different transmitting powers are distributed to the two virtual users by using the power distribution factor, and the two virtual users and the users which are not split transmit signals at different transmitting powers; and finally, the access point receiver adopts a Successive Interference Cancellation (SIC) method to recover the signals sent by the users which are not split and the signals sent by the two virtual users, and recovers the signals of the users before splitting according to the signals of the two virtual users.
2. The method of claim 1, wherein the rate splitting is performed by:
a) rate splitting, for a NOMA uplink transmission system serving two users, comprising an access point and two users U1、U2The two users comprise a near user and a far user, and the user U is recordediThe small scale fading of the channel to the access point is hiLarge scale fading of channel is LiI is 1, 2; user U1、U2Respectively, is denoted as x1、x2；
Selecting a user U1Rate splitting, user U1Uplink signal x of1Is split into data streams x11、x12Splitting the signal x11、x12The two corresponding virtual users are respectively marked as U11、U12；
b) Computing a superimposed signal, in the power domain, the split data stream x11And x12The resulting superimposed signal d is:
in the formula, P1Is a user U1α is a power allocation factor;
c) find the received signal, during the uplink transmission, two users U1、U2And simultaneously transmitting signals to the access point, wherein the signals y received by the access point receiver are:
in the formula,P2for user U2N is a noise signal;
d) determining the transmission power of the user, when using compensatory power control, in order to ensure that the access point receiver uses successive interference cancellation SIC to process the required power difference between the user signals, user UiTransmit power P ofiIt should satisfy:
in the formula, PtIs connected toThe target power of the received signal required by the access point,is the power step factor used to compensate for power control;
e) uplink signalling, user U1According to the transmission power P1And splitting the signal x11、x12The power division factor alpha of, user U2According to the transmission power P2And sending the signal.
3. The method of claim 2, wherein the signal recovery method of the ap receiver is implemented by:
1) first, the signal x is recovered11After the receiver of the access point receives the signal y, the continuous interference elimination method SIC is adopted to firstly recover the U1Split signal x of11From equation (2), the pair x11The received signal-to-noise ratio for detection is:
where P ═ P1L2/σ2，σ2In order to be able to measure the power of the noise,and satisfies 0 < epsilon < 1;
after recovering signal x11And subtracted from the received signal shown in equation (2), the remaining signal is used to recover x2The remaining signals are represented as:
2) secondly, recover the signal x2Signal x11After recovery, signal x is recovered2From equation (5), can be derivedSignal x2The received signal-to-noise ratio for detection is:
after recovering signal x2And subtracted from the received signal shown in equation (5), the remaining signal is used to recover x12The remaining signals are represented as:
3) finally, the signal x is recovered12Signal x11After recovery, signal x is recovered12From equation (7), the signal x can be obtained2The received signal-to-noise ratio for detection is:
γ12＝(1-α)ρ|h1|2 (8)
signal x recovered by receiver of receiving point11And x12For recovering x1。
4. The method of claim 3, wherein the relation between the target transmission rate and the power allocation factor is determined by:
let user U1、U2Are respectively expressed asAndthen x is correctly decoded1And x2The required threshold values of the signal-to-noise ratio are respectivelyAndfor data stream x after rate splitting11、x12Target transmission rates are respectivelyAndwhere β is the rate splitting factor, then the signal x is correctly decoded11And x12The required threshold values of the signal-to-noise ratio are respectivelyAnd
namely, the requirements are as follows:
thus, when a user transmit power P of a NOMA uplink transmission system serving two usersiPower distribution factor alpha, channel small-scale fading hiLarge scale fading L of channeliRate split factor beta, power step factorAfter the determination, the user U can be identified1、U2The outage probability of (2) is analyzed.
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| CN111654904A (en) * | 2020-04-30 | 2020-09-11 | 南京理工大学 | Non-orthogonal multiple access power distribution method based on spherical codes |
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| CN111654904A (en) * | 2020-04-30 | 2020-09-11 | 南京理工大学 | Non-orthogonal multiple access power distribution method based on spherical codes |
| CN111654903B (en) * | 2020-04-30 | 2022-09-06 | 南京理工大学 | Non-orthogonal access power distribution method based on four-dimensional spherical code modulation |
| CN111654904B (en) * | 2020-04-30 | 2022-09-06 | 南京理工大学 | Non-orthogonal multiple access power distribution method based on spherical codes |
| CN115426017A (en) * | 2022-05-20 | 2022-12-02 | 西安邮电大学 | Multi-address method and system based on harmonic signal virtual non-orthogonal decomposition |
| CN115426017B (en) * | 2022-05-20 | 2023-08-04 | 西安邮电大学 | Multiple access method and system based on harmonic signal virtual non-orthogonal decomposition |
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