Power distribution method based on OTFS-NOMA cross-domain transmission system
A technology of OTFS-NOMA and transmission system, which is applied in the field of power distribution in the cross-domain transmission system based on OTFS-NOMA, can solve problems not related to power distribution, achieve maximum throughput, improve spectrum efficiency, and ensure communication quality Effect
Active Publication Date: 2021-08-20
NANJING UNIV OF POSTS & TELECOMM
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Some users are moving at high speed, some users are static or moving at low speed, the traditional allocation is based on the allocation of the same domain, and the existing cross-domain system performance does not involve power allocation
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[0022] Based on the power distribution method in the OTFS-NOMA cross-domain transmission system described in the present invention, the steps of the method are:
[0023] Step 1. Transform the high-speed mobile user signal located in the delay-Doppler domain to the time-frequency domain and the low-speed mobile user signal originally located in the time-frequency domain as a NOMA group, wherein the high-speed mobile user is used as an edge user in the traditional NOMA, As the central user in traditional NOMA, the low-speed mobile user first obtains the superimposed signal of the high-speed mobile user signal and the low-speed mobile user signal in the time-frequency domain at the receiving end;
[0024] Step 2, transforming the time-frequency domain superposition signal (including high-speed mobile user signal and low-speed mobile user signal) into the delay-Doppler domain;
[0025] Step 3, the high-speed mobile user signal is a pulse signal in the delay-Doppler domain, and the...
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According to the power distribution method based on the OTFS-NOMA cross-domain transmission system, high-speed user power distribution is considered in DDT, then low-speed user signals are converted into a time-frequency domain, and power numerical values of low-speed users are calculated. Herein, the low-speed user multiplexes the frequency band of the high-speed user, so that the spectrum efficiency is effectively improved; through the distribution scheme, the problem of power distribution of high-speed mobile users and low-speed mobile users in the signal transmission process is solved, and the problem that effective communication is difficult to carry out by the users located in different domains is solved; finally, according to the distribution scheme, an NOMA technology and an OTFS technology are applied, and the number of communication users is increased; meanwhile, the communication quality between the communication users is guaranteed, and the throughput of the whole system is improved.
Description
technical field [0001] The invention relates to the technical field of wireless communication, in particular to a power allocation method in an OTFS-NOMA-based cross-domain transmission system. Background technique [0002] With the development of high-speed traffic, high-speed mobile users have higher and higher communication requirements. Some users are moving at high speed, some users are static or moving at low speed, the traditional allocation is based on the allocation of the same domain, and the existing cross-domain system performance does not involve power allocation. [0003] NOMA is a non-orthogonal multiple access technology, and OTFS is an orthogonal time-frequency modulation. Based on the OTFS-NOMA communication scenario, users have heterogeneous mobility characteristics. In the document [OTFS-NOMA: An Efficient Approach for Exploiting Heterogenous UserMobility Profiles], a cross-domain system is proposed, and the system is briefly analyzed, but no research on...
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IPC IPC(8): H04W52/34
CPCH04W52/346
Inventor 王海荣王李王文静张军
Owner NANJING UNIV OF POSTS & TELECOMM