Non-orthogonal multiple access serial interference cancellation method based on soft decision decoding

A serial interference elimination and non-orthogonal multiple access technology, applied in the field of communication, can solve problems such as poor reliability, and achieve the effect of improving reliability and bit error performance

Active Publication Date: 2019-02-15
XIDIAN UNIV
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Problems solved by technology

[0006] The object of the present invention is to address the shortcomings of the above-mentioned serial interference elimination method, and propose a non-orthogonal multiple access serial interference elimination method based on soft-decision decoding with better reliability, which is used to solve the serial interference elimination method The problem of poor reliability

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  • Non-orthogonal multiple access serial interference cancellation method based on soft decision decoding
  • Non-orthogonal multiple access serial interference cancellation method based on soft decision decoding
  • Non-orthogonal multiple access serial interference cancellation method based on soft decision decoding

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Embodiment 1

[0034] Most of the current research on non-orthogonal multiple access assumes that the serial interference cancellation is ideal, that is, the interference can be completely eliminated. In actual situations, due to inaccurate channel estimation or inaccurate judgment, the interference signal cannot be completely removed from the mixed signal, and the target user is still affected by residual interference, resulting in poor system reliability. For this reason, the present invention proposes a non-orthogonal multiple access serial interference elimination method based on soft-decision decoding, see figure 1 , including the following steps:

[0035] (1) Channel coding for users multiplexed in the power domain: users in the non-orthogonal multiple access system can transmit on the same resource block through multiplexing in the power domain. In order to enhance the anti-interference ability of the user's transmitted signal during channel transmission, the convolutional coding in ...

Embodiment 2

[0048] The non-orthogonal multiple access serial interference elimination method based on soft-decision decoding is the same as embodiment 1, and the user described in step (1) performs channel coding to the power domain multiplexing user, including the following steps:

[0049] refer to image 3 , perform convolutional encoding on the binary sequence of user i (i=1, 2) multiplexed in the power domain. If the binary sequence of user i (i=1,2) is u i =(u 0 u 1 u 2 u 3 ......), the codeword sequence of the two output ends of the corresponding encoder is and and By encoding the equation can be written as The symbol represents the convolution operation, g 1 , g 2 Represents the two impulse responses of the encoder, that is, the input sequence and the two impulse responses of the encoder are respectively convoluted to obtain the two output codeword sequences of the encoder; the convolutional encoder is composed of a six-bit shift register, and the impulse The res...

Embodiment 3

[0052] The non-orthogonal multiple access serial interference elimination method based on soft-decision decoding is the same as embodiment 1-2, and the channel equalization is carried out according to the channel gain described in step (5), including the following content:

[0053] In order to compensate for the influence of path loss, channel equalization is performed on the received signal. Assuming that the receiving end knows the channel gain of the user, the channel gain of user 1 is greater than the channel gain of user 2, the serial interference cancellation is implemented on user 1, and the channel gain on user 1 , for the received signal r 1 For channel equalization, the channel gain h of user 1 1 , the equalized signal r h = r 1 / h 1 .

[0054] On user 1, the path loss of the received signal is compensated by the channel equalization method.

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Abstract

The invention discloses a non-orthogonal multiple access serial interference cancellation method based on soft decision decoding, which solves the problem of poor reliability of serial interference cancellation technology. The method comprises the following implementation steps: encoding the power domain user by using channel encoding to obtain an encoded signal; modulating the encoded signal by abinary frequency shift keying modulation method to obtain a modulated signal; using a superposition encoding technique to allocate power to the modulated signal for superimposing to obtain a transmitted signal; obtaining a received signal by the transmitted signal through a channel; performing channel equalization on the received signal; determining a decoding order of the serial interference cancellation according to the channel gain; and obtaining an estimated signal of the target user by using the soft decision decoding and the serial interference cancellation method. The method provided by the invention fully utilizes the information of channel error statistical characteristics in the received signal based on the soft decision decoding technology, and combines with the serial interference cancellation to improve the reliability of the non-orthogonal multiple access system, which is used in the downlink of multi-user non-orthogonal multiple access systems.

Description

technical field [0001] The invention belongs to the field of communication technology, and relates to a non-orthogonal multiple access serial interference elimination method, in particular to a soft-decision decoding-based non-orthogonal multiple access serial interference elimination method, which can be used to deal with serial interference Eliminate the problem of poor technical reliability. Background technique [0002] Facing the increasingly tight spectrum resources and increasing service demands, Non-Orthogonal Multiple Access (NOMA) technology, as one of the solutions, has attracted widespread attention. Different from the orthogonal multiple access technology, the non-orthogonal multiple access technology transmits to different users simultaneously on the same resource block. The base station allocates different power to different users according to the size of the channel gain and performs superimposed transmission, and the receiving end detects multiple users thr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/03H04L1/00
CPCH04L1/0059H04L25/03318H04L2025/03394
Inventor 张慧爽刘祖军孙德春孙永军
Owner XIDIAN UNIV
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