CN113286355A - Power distribution method based on OTFS-NOMA cross-domain transmission system - Google Patents

Power distribution method based on OTFS-NOMA cross-domain transmission system Download PDF

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CN113286355A
CN113286355A CN202110553232.XA CN202110553232A CN113286355A CN 113286355 A CN113286355 A CN 113286355A CN 202110553232 A CN202110553232 A CN 202110553232A CN 113286355 A CN113286355 A CN 113286355A
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speed mobile
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CN113286355B (en
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王海荣
王李
王文静
张军
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Nanjing University of Posts and Telecommunications
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Nanjing University of Posts and Telecommunications
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • H04W52/34—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading
    • H04W52/346—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading distributing total power among users or channels

Abstract

The power distribution method in the OTFS-NOMA based cross-domain transmission system considers the power distribution of the high-speed users in DDT, then transforms the signals of the low-speed users into a time-frequency domain, and calculates the power value of the low-speed users. The low-speed users multiplex the frequency bands of the high-speed users, so that the frequency spectrum efficiency is effectively improved; the allocation scheme solves the problem of power allocation of high-speed mobile users and low-speed mobile users in the signal transmission process, and solves the problem that the users in different domains are difficult to effectively communicate; finally, the allocation scheme applies NOMA (non-orthogonal multiple access) technology and OTFS (orthogonal time frequency space) technology, improves the number of communication users, ensures the communication quality among the communication users and improves the throughput of the whole system.

Description

Power distribution method based on OTFS-NOMA cross-domain transmission system
Technical Field
The invention relates to the technical field of wireless communication, in particular to a power distribution method in an OTFS-NOMA (optical transport plane-non-orthogonal multiple access) cross-domain transmission system.
Background
With the development of high-speed traffic, the demand of high-speed mobile users for communication is higher and higher. Some users move at high speed, some users move at static or low speed, traditional allocation is based on allocation of the same domain, and existing cross-domain system performance does not involve power allocation.
NOMA is a non-orthogonal multiple access technology, OTFS is orthogonal time frequency modulation, and the OTFS-NOMA-based communication scene is provided, wherein users have heterogeneous mobile characteristics. A cross-domain system is proposed in the document [ OTFS-NOMA: An Efficient Approach for expanding heterogeneous utilities Profiles ], the system is briefly analyzed, but research on power distribution is not carried out, and therefore the power distribution scheme provided by the invention is beneficial to improving the throughput of the whole cross-domain system, and users located in different domains can carry out better communication.
Disclosure of Invention
In order to solve the technical problem, the OTFS-NOMA cross-domain system provided by the invention provides a layered power allocation scheme to group users with different mobility characteristics together so as to perform NOMA grouping, and the OTFS-NOMA scheme is used for downlink transmission.
The invention discloses a power distribution method in an OTFS-NOMA cross-domain transmission system, which comprises the following steps:
step 1, converting a high-speed mobile user signal positioned in a delay-Doppler domain into a time-frequency domain and taking a low-speed mobile user signal originally positioned in the time-frequency domain as an NOMA group, wherein the high-speed mobile user is taken as an edge user in the traditional NOMA, the low-speed mobile user is taken as a center user in the traditional NOMA, and a superposed signal of the high-speed mobile user signal and the low-speed mobile user signal in the time-frequency domain is obtained at a receiving end;
step 2, transforming the time-frequency domain superposed signals (including high-speed mobile user signals and low-speed mobile user signals) into a delay-Doppler domain;
step 3, the high-speed mobile user signal is a pulse signal in a delay-Doppler domain, a low-speed mobile user signal is used as noise, and a serial interference cancellation technology (SIC) is used for demodulating the signal of the high-speed mobile user;
step 4, obtaining the signal of the low-speed user in a delay-Doppler Domain (DDT) based on the demodulated high-speed user signal;
step 5, setting a speed lower bound value R of the high-speed mobile user, wherein in order to execute SIC in the delay-Doppler domain, the transmission speed of the high-speed mobile user is less than the speed of each low-speed user, and the power distribution range of the high-speed user is obtained;
step 6, subtracting the demodulated high-speed mobile user signal from the delay-Doppler domain signal to obtain a signal user signal of the low-speed mobile user in the delay-Doppler domain, and obtaining the SINR of the low-speed mobile user in the delay-Doppler domain, and transforming the SINR into a time-frequency domain;
and 7, in the time-frequency domain, performing power distribution according to the channel state of each user by taking the channel state of the low-speed mobile user as a reference.
Further, in step 2, the minimum rate of the low-speed mobile users is greater than the rate of the high-speed mobile users.
Further, in step 3, the signal of the high-speed mobile user is demodulated, and DFT equalization is used to obtain the SINR (signal to interference plus noise ratio) of the high-speed signal as:
Figure BDA0003076167610000021
wherein
Figure BDA0003076167610000022
For transmitting signal-to-noise ratio, pi(i is more than or equal to 0 and less than or equal to M) is the transmission power of the low-speed mobile user, p0Transmitting power for high-speed mobile users, H0A channel is transmitted for high speed users.
Further, in step 6, SINR (signal to interference plus noise ratio) of low-speed users in the delay-doppler domain:
Figure BDA0003076167610000023
wherein the content of the first and second substances,
Figure BDA0003076167610000024
for transmitting signal-to-noise ratio, pi(i is more than or equal to 0 and less than or equal to M) is the transmission power of the low-speed mobile user, HiThe channel is transmitted for the low speed user.
Further, in step 7, the power allocation formula for the channel state of each low-speed mobile user is as follows
Figure BDA0003076167610000025
P in the formulaiSending power meter, H, for low speed usersiThe channel through which the low speed user transmits signals is defined, and p is the total power of the low speed user group.
The invention has the beneficial effects that: based on an OTFS-NOMA cross-domain system, the frequency band of a high-speed user is reused by a low-speed user, and the frequency spectrum efficiency is effectively improved; secondly, the power distribution problem of high-speed mobile users and low-speed mobile users in the signal transmission process is solved through the distribution scheme, and the problem that the users in different domains are difficult to effectively communicate is solved; finally, the allocation scheme uses NOMA technology and OTFS technology, thereby improving the number of communication users and ensuring the communication quality among the communication users; the invention distributes corresponding power for users of different channels in different domains based on cross-domain layered power distribution, thereby realizing the maximization of the throughput of the whole system.
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In order that the present invention may be more readily and clearly understood, a more particular description of the invention briefly described above will be rendered by reference to specific embodiments that are illustrated in the appended drawings.
Fig. 1 is a system model diagram of a downlink;
fig. 2 is a downlink single carrier NOMA communication scenario diagram;
FIG. 3 is a flow chart of an OTFS-NOMA based system.
Detailed Description
The invention discloses a power distribution method in an OTFS-NOMA cross-domain transmission system, which comprises the following steps:
step 1, converting a high-speed mobile user signal positioned in a delay-Doppler domain into a time-frequency domain and taking a low-speed mobile user signal originally positioned in the time-frequency domain as an NOMA group, wherein the high-speed mobile user is taken as an edge user in the traditional NOMA, the low-speed mobile user is taken as a center user in the traditional NOMA, and a superposed signal of the high-speed mobile user signal and the low-speed mobile user signal in the time-frequency domain is obtained at a receiving end;
step 2, transforming the time-frequency domain superposed signals (including high-speed mobile user signals and low-speed mobile user signals) into a delay-Doppler domain;
step 3, the high-speed mobile user signal is a pulse signal in a delay-Doppler domain, the low-speed mobile user signal is used as noise, and the SIC is used for demodulating the signal of the high-speed mobile user;
step 4, obtaining the signal of the low-speed user in the DDT based on the demodulated high-speed user signal;
step 5, setting a speed lower bound value R of the high-speed mobile user, wherein in order to execute SIC in the delay-Doppler domain, the transmission speed of the high-speed mobile user is less than the speed of each low-speed user, and the power distribution range of the high-speed user is obtained;
step 6, subtracting the demodulated high-speed mobile user signal from the delay-Doppler domain signal to obtain a signal user signal of the low-speed mobile user in the delay-Doppler domain, and obtaining the SINR of the low-speed mobile user in the delay-Doppler domain, and transforming the SINR into a time-frequency domain;
and 7, in the time-frequency domain, performing power distribution according to the channel state of each user by taking the channel state of the low-speed mobile user as a reference.
As shown in fig. 1, the present invention proposes an OTFS-NOMA based downlink. In the scenario shown in fig. 1, the base station sends signals to a high-speed fixed user and a plurality of low-speed mobile users, the high-speed mobile user is located in the delay-doppler domain and the low-speed user is located in the time-frequency domain, wherein the communication objects are a high-speed mobile user and a K-low-speed mobile user, and the high-speed user signals are U-signals0Indicating that K bits are U for low speed mobile userskRepresents, where K ∈ {1, 2.. K }. The process of the present solution will be specifically described below with reference to fig. 2 and fig. 3, where fig. 3 is an implementation flow of the whole solution:
wherein U is0Representing high-speed mobile subscriber signals, U1....UkRepresenting a low speed mobile user signal;
1. modulating the high-speed mobile user signal to low-speed mobile user signal superposition transmission in a time-frequency domain and a time-frequency domain:
Figure BDA0003076167610000041
wherein p isk(0. ltoreq. k. ltoreq.M) isAllocated power of users, H0[n,m]A channel is transmitted for high speed users.
2. The superimposed user signal is transmitted through a channel, and is firstly transmitted to a time-frequency plane of a receiving end through the channel, and at this time, the received signal of each user is: y isi[n,m]＝Hi[n,m]X[n,m]+Vi[n,m]，Hi[n,m]For transmission channels of low-speed users, Vi[n,m]Is additive white gaussian noise;
3. transforming the received high-speed user time-frequency domain signal into a delay-doppler domain:
Figure BDA0003076167610000042
y in the above formula0[n，m]A representation in the time-frequency domain for high-speed user signals;
4. because the signal of the high-speed user is a high pulse signal in the delay-doppler domain, the signal of the high-speed user is demodulated first, and the SINR of the high-speed signal is obtained by DFT equalization as follows:
Figure BDA0003076167610000043
wherein p isk(k is 0. ltoreq. M) is the allocated power of the user, H0[n,m]Transmitting a channel for a high-speed user;
5. after the high-speed mobile user signal is demodulated, subtracting the high-speed mobile user signal from the superposed signal to obtain a signal of the low-speed user in a delay-Doppler domain as follows:
Figure BDA0003076167610000044
6. based on DFT equalization and the above formula, the SINR of the low-speed user in the delay-doppler domain can be obtained:
Figure BDA0003076167610000051
wherein
Figure BDA0003076167610000052
For transmitting signal-to-noise ratio, pi(i is more than or equal to 0 and less than or equal to M) is user transmission power, HiTransmitting a channel for a low-speed user;
7. in order to perform SIC, the low-speed users need to be able to decode the signals of the high-speed users, and in this case, it is necessary to satisfy: e [ log ]2(1+SINRd,i)]≥E[log2(1+SINR0)]Based on the obtained upper bound value of power distribution of the high-speed user, wherein SINRd,iSINR for low speed users in the delay-Doppler domain0Signal to interference plus noise ratio for high speed users;
8. in order to meet the transmission of the high-speed mobile user, the signal per se needs to meet a certain transmission rate, the value of the transmission rate is set as R, and the power distribution constraint of the high-speed user can be obtained according to the step 6 and the rate R;
9. and transforming the signal of the low-speed user in the delay-Doppler domain to a time-frequency domain to obtain:
Figure BDA0003076167610000053
Hi[n,m]for low-speed user transmission channels, Xq[n,m]For transmitting signals of low-speed bellows, Vi[n,m]Is additive white gaussian noise;
10. in the time-frequency domain, the low-speed user signals are OFDM (orthogonal frequency division multiplexing) symbols, and power allocation is performed based on the channel state of each user:
Figure BDA0003076167610000054
p in the formulaiSending power meters, H, for low-speed usersiThe channel through which the low speed user transmits signals is defined, and p is the total power of the low speed user group.
Based on the layered power distribution scheme, the throughput maximization of the whole cross-domain system is realized.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and all equivalent variations made by using the contents of the present specification and the drawings are within the protection scope of the present invention.

Claims (5)

1. The power distribution method based on OTFS-NOMA cross-domain transmission system is characterized by comprising the following steps:
step 1, converting a high-speed mobile user signal positioned in a delay-Doppler domain into a time-frequency domain and taking a low-speed mobile user signal originally positioned in the time-frequency domain as an NOMA group, wherein the high-speed mobile user is taken as an edge user in the traditional NOMA, the low-speed mobile user is taken as a center user in the traditional NOMA, and after channel transmission, a signal of a superposed signal in the time-frequency domain is obtained at a receiving end;
step 2, transforming the superposed signals obtained in the time-frequency domain of the receiving end into a delay-Doppler domain;
step 3, the high-speed mobile user signal is a pulse signal in a delay-Doppler domain, the low-speed mobile user signal is used as noise, and the SIC is used for demodulating the signal of the high-speed mobile user;
step 4, obtaining the signal of the low-speed user in the delay-Doppler domain based on the demodulated high-speed user signal;
step 5, setting a speed lower bound value R of the high-speed mobile user, and obtaining a power distribution range of the high-speed user in order to execute SIC in a delay-Doppler domain;
step 6, subtracting the demodulated high-speed mobile user signal from the delay-Doppler domain signal to obtain a signal of the low-speed mobile user in a delay-Doppler domain, obtain the SINR of the low-speed mobile user in the delay-Doppler domain, and transforming the SINR into a time-frequency domain;
and 7, in the time-frequency domain, performing power distribution according to the channel state of each user by taking the channel state of the low-speed mobile user as a reference.
2. The method for allocating power in an OTFS-NOMA based cross-domain transmission system as claimed in claim 1, wherein in step 2, the minimum rate of the low speed mobile users is greater than the rate of the high speed mobile users.
3. The power allocation method in the OTFS-NOMA based cross-domain transmission system according to claim 1, wherein in step 3, the signal of the high speed mobile user is demodulated, DFT equalization is used, and the SINR of the high speed signal is obtained as follows:
Figure FDA0003076167600000011
wherein the content of the first and second substances,
Figure FDA0003076167600000012
for transmitting signal-to-noise ratio, pi(i is more than or equal to 0 and less than or equal to M) is the transmission power of the low-speed mobile user, p0Transmitting power for high-speed mobile users, H0A channel is transmitted for high speed users.
4. The method for allocating power in an OTFS-NOMA based cross-domain transmission system as claimed in claim 1, wherein in step 6, SINR of low-speed users in the delay-Doppler domain is:
Figure FDA0003076167600000013
wherein the content of the first and second substances,
Figure FDA0003076167600000021
for transmitting signal-to-noise ratio, pi(i is more than or equal to 0 and less than or equal to M) is the transmission power of the low-speed mobile user, HiThe channel is transmitted for the low speed user.
5. The power allocation method in the OTFS-NOMA based cross-domain transmission system according to claim 1, wherein in step 7, the formula for allocating power to the channel status of each low speed mobile user is:
Figure FDA0003076167600000022
wherein p isiSending power meters, H, for low-speed usersiThe channel through which the low speed user transmits signals is defined, and p is the total power of the low speed user group.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2615088A (en) * 2022-01-26 2023-08-02 British Telecomm Wireless telecommunications network

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110730494A (en) * 2019-10-17 2020-01-24 哈尔滨工业大学 Power optimization method for maximizing minimum safe rate of unmanned aerial vehicle downlink non-orthogonal multiple access (NOMA) mobile user
WO2020095101A1 (en) * 2018-11-06 2020-05-14 Indian Institute Of Technology, Delhi Multiple access method in wireless telecommunications system
CN112087247A (en) * 2020-08-04 2020-12-15 西安电子科技大学 Path division multiple access method based on large-scale MIMO-OTFS

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020095101A1 (en) * 2018-11-06 2020-05-14 Indian Institute Of Technology, Delhi Multiple access method in wireless telecommunications system
CN110730494A (en) * 2019-10-17 2020-01-24 哈尔滨工业大学 Power optimization method for maximizing minimum safe rate of unmanned aerial vehicle downlink non-orthogonal multiple access (NOMA) mobile user
CN112087247A (en) * 2020-08-04 2020-12-15 西安电子科技大学 Path division multiple access method based on large-scale MIMO-OTFS

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2615088A (en) * 2022-01-26 2023-08-02 British Telecomm Wireless telecommunications network

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