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Downlink sending method suitable for non-orthogonal multiple access system

A non-orthogonal multiple access, access system technology, applied in the field of downlink transmission, can solve problems such as system performance degradation, instantaneous power fluctuation, and system complexity increase, and achieve the effect of reducing the bit error rate

Active Publication Date: 2019-09-13
SOUTHEAST UNIV
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Problems solved by technology

However, there should not be too many user layers in the power domain, otherwise the system complexity will increase in vain, and the system performance will decline rapidly, so usually only 2 users are superimposed
After superimposing users, the additive relationship between the transmitted signals leads to large fluctuations in instantaneous power

Method used

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  • Downlink sending method suitable for non-orthogonal multiple access system
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  • Downlink sending method suitable for non-orthogonal multiple access system

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Embodiment Construction

[0038] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0039] Consider a NOMA system where the base station serves two users simultaneously using the same physical resource, such as time. Assuming that the transmitted signal experiences a flat fading channel, the channel parameter of user 1 is h 1 , the channel parameter of user 2 is h 2 , and remains unchanged during user transmission. Assuming that user 2 is farther from the base station than user 1, then |h 1 | 2 >|h 2 | 2 . According to the channel parameters fed back by users, the base station allocates power P 1 To user 1, allocate power P 2 to user 2, and P 1 2 , resulting in a send signal that looks like this:

[0040]

[0041] Among them, X 1 (n) and X 2 (n) respectively represent the data sent by the base station to user 1 and user 2 at the nth moment, which are modulated by BPSK or QPSK.

[0042] It can ...

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Abstract

The invention discloses a downlink sending method suitable for a NOMA system, which comprises the following steps: a sending end dividing data sequences which need to be sent to users 1 and 2 into groups with the same length, and each group containing M pieces of data; the sending end distributing sending power P1 and P2 according to the strength of the downlink channels of the user 1 and the user2, and setting P1<P2; keeping the data in the user group 2 unchanged, performing cyclic shift on the data in each group of the user 1 by the sending end, and calculating to obtain M total average sending powers; the sending end selecting one shifting mode with the strongest average sending power to send a signal, and informing the receiving end of the user 1 of the shifted value through the control channel; a receiving end of the user 1 estimating a receiving signal of the user 2, and then demodulating the signal after eliminating the interference of the receiving signal; and the receiving end of the user 2 directly demodulating the received signal. According to the invention, the bit error rate of a receiving end is effectively reduced, and a sending method which is fast, reliable, low in implementation complexity and suitable for NOMA and other non-orthogonal multiple access technologies is provided.

Description

technical field [0001] The invention belongs to the field of signal processing in mobile communication systems, and in particular relates to a downlink transmission method suitable for non-orthogonal multiple access systems. Background technique [0002] The fifth-generation mobile communication (5G) technology will create a new type of mobile communication with ever-changing and unprecedented prosperity for the application of future mobile communication systems in terms of wide coverage, high capacity, low delay, high reliability, low power consumption, and large connection. communication age. In order to further improve the spectral efficiency of the system and meet the design concepts and technical requirements of 5G and 6G in the future, non-orthogonal multiple access technology has become a research hotspot. At present, the main four non-orthogonal multiple access technologies are: non-orthogonal multiple access (NOMA, Non Orthogonal Multiple Access) proposed by Japan'...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W52/34H04L25/03H04L1/00H04L27/18
CPCH04L1/0048H04L25/03821H04L27/18H04W52/346
Inventor 盛彬张辉顾嘉雯张佳丽
Owner SOUTHEAST UNIV
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