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SCMA resource dynamic optimal distribution method

A technology of dynamic optimization and distribution methods, applied in power management, wireless communication, electrical components, etc., to achieve significant progress, increase total capacity, and highlight the effect of substantive features

Active Publication Date: 2018-11-06
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0005] In view of this, the object of the present invention aims to propose based on the SCMA uplink dynamic group resource joint allocation iterative optimization method of maximizing capacity, solves the problem of optimal allocation of resources in the group

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Embodiment Construction

[0025] The technical scheme of the present invention will be described in further detail below in conjunction with the accompanying drawings, and the given examples are only used to explain the present invention, and are not intended to limit the scope of the present invention.

[0026] The present invention innovatively proposes a method for iterative optimization of dynamic resource allocation in SCMA uplink groups based on maximizing capacity, and the technical scheme is as follows:

[0027] Consider the uplink SCMA system, assuming that the number of subcarriers in the SCMA system is K, and the number of users accessible to the system is J, that is, J users multiplex K subcarrier resource blocks (J>K). In order not to lose generality, It is assumed here that each user occupies one layer, the dimension of each user's codebook is K, and the size of the codebook is M, that is, each codebook has M codewords. The SCMA encoder is the log 2 M bits are mapped to C, where is a K...

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Abstract

The invention discloses a SCMA resource dynamic optimal distribution method. For an uplink grouping user accessing to a base station by applying SCMA technology, the sub-carrier distribution and the power distribution of the in-group user are optimized, thereby establishing an optimization model based on the maximized uplink SCMA system and rate. The method comprises the following steps: initializing a random mapping matrix F0 and an equipower distribution matrix P0, and computing to obtain an interference matrix I0; optimally updating the mapping matrix F by using a sub-carrier distribution optimal algorithm according to the obtained interference matrix I0; solving the power distribution of the sub-carrier according to the obtained interference matrix I and the optimized mapping matrix F,namely obtaining a power matrix P; and updating the interference matrix I, and accomplishing multi-turn iterative optimization and corresponding power distribution on the mapping matrix F by using the sub-carrier optimal algorithm until the iteration is reasonably terminated, namely obtaining a sub-carrier distribution scheme and a power distribution scheme. The total system volume is effectivelyimproved.

Description

technical field [0001] The invention relates to an iterative optimization method for jointly allocating resources in an SCMA uplink dynamic group based on capacity maximization, and belongs to the technical field of wireless communication. Background technique [0002] So far, non-orthogonal multiple access has become a key part of the 5G physical layer, which not only provides higher spectral efficiency, but also supports a larger number of user connections compared to existing systems. At present, there are two promising non-orthogonal multiple access schemes that have received widespread attention from academia and industry, namely power-domain non-orthogonal multiple access (NOMA) and sparse code multiple access (SCMA). Specifically, NOMA introduces a new dimension—power domain, where different users can share the same resource block, and sequential interference cancellation (SIC) is used to cancel the interference between different users at the receiver. SCMA is a non-...

Claims

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Application Information

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IPC IPC(8): H04W52/24H04W72/04
CPCH04W52/243H04W72/0453H04W72/0473H04W72/53
Inventor 孙君熊关
Owner NANJING UNIV OF POSTS & TELECOMM
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