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Dynamic-SWIPT-based cooperative transmission method in downlink NOMA communication system

A communication system and cooperative transmission technology, which is applied in the field of NOMA communication system, can solve the problems of limited effect of increasing the data rate of remote users and the inability to fully improve the fairness of data rate, etc.

Active Publication Date: 2019-02-15
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

However, in existing studies, the time allocation coefficient in the SWIPT protocol is fixed (usually set to 0.5), and only the power allocation coefficient is optimized and analyzed. This method has a limited effect on improving the data rate of remote users, and cannot Further research is needed to fully improve the data rate fairness between two users

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[0030] In order to better illustrate the technical scheme of the present invention, first as figure 1 The illustrated two-user downlink NOMA communication system is described in detail. Such as figure 1 As shown, in the downlink NOMA communication system, the near-end user U N , remote user U F Both are equipped with multiple antennas and work in half-duplex mode. The present invention assumes that the wireless channels from the base station to the user in the system are independent and identically distributed Rayleigh channels, and the channel coefficient is h wv (w∈{S,U N}, v∈{U N ,U F}) means that the background noise n i (i∈{N,F}) is a complex Gaussian random variable with mean 0 and variance σ 2 , and assume that the channel state information at base station S is known.

[0031] In order to reduce the remote user U F The outage probability of the near-end user U is improved N with remote U F The data rate difference between, the present invention in the near-e...

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Abstract

The invention discloses a dynamic-SWIPT-based cooperative transmission method in a downlink NOMA communication system. A system transmission period T is divided into two phases, time of a first phaseis (1-alpha)T, and time of a second phase is alphaT; in the first phase, a near-end user receives a radio frequency signal of a base station, the radio frequency signal is divided into two parts, power of a first part accounts for beta and the first part is used for performing energy harvesting by a near-end user, power of a second part accounts for 1-beta and the second part is used for performing user information decoding by the near-end user and receiving a base station signal by a far-end user; and in the second phase, the near-end user is taken as a relay and transmits information to thefar-end user, and the far-end user decodes a signal by virtue of a selection combination technology, wherein a time distribution coefficient alpha and a power distribution coefficient beta are determined by solving an optimization problem. The method disclosed by the invention performs dynamic adjustment on the time distribution coefficient and the power distribution coefficient, balances a data rate difference between the near-end user and the far-end user in real time and also realizes maximum total data rate of the communication system.

Description

technical field [0001] The invention belongs to the technical field of NOMA communication systems, and more specifically relates to a dynamic SWIPT-based cooperative transmission method in a downlink NOMA communication system. Background technique [0002] Non-orthogonal Multiple Access (NOMA) is a hot technology of 5G. NOMA is different from the previous multiple access technology. NOMA uses non-orthogonal power domain coding technology to distinguish users. The so-called non-orthogonal means that the data of different users can be transmitted on the same time slot and frequency. Only rely on the difference in data encoding power to distinguish users. [0003] According to the research, in the downlink NOMA communication system, the distance between the users in the cell and the base station will lead to obvious data rate differences, that is, the data rate of the near-end users (closer to the base station) is better, while the data rate of the far-end users (closer to the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L5/00H04W72/04H04W72/12
CPCH04L5/0058H04L5/0078H04W72/0473H04W72/1215H04W72/1221
Inventor 杨凯阎啸秦开宇王茜
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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