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Multiple access method based on physical layer network coding

A technology of network coding and access method, applied in the directions of transmission monitoring, electrical components, transmission systems, etc., can solve problems such as inability to reach channels, inability to flexibly allocate user rate resources, etc. boosted effect

Active Publication Date: 2021-12-10
BEIHANG UNIV
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Problems solved by technology

However, [2] is only applicable to BPSK and QPSK modulation, and cannot reach all points on the dominant surface of the channel capacity limit, i.e. cannot flexibly allocate user rate resources under the same channel gain

Method used

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  • Multiple access method based on physical layer network coding
  • Multiple access method based on physical layer network coding
  • Multiple access method based on physical layer network coding

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Embodiment Construction

[0078] In order to have a further cognition and understanding of the principles, methods, features, and performance advantages of the present invention, it is now described in detail.

[0079] Preparation

[0080] 1. Non-equidistant constellation point mapping

[0081] The expression of equidistant q-PAM modulation has been given in the third step of the technical solution. In the following specific implementation, not only equidistant q-PAM modulation will be used, but also non-equidistant q-PAM modulation will be used. Therefore, the method of non-equidistant q-PAM modulation is given here, taking q=5 as an example, such as Figure 5 As shown, assuming that the constellation points are symmetrical about the origin, and setting the ratio of the distance from the origin to the closest point to the distance from the origin to the outermost point as ρ (0 where γ is used to normalize the energy. The mapping relationship can be expressed as

[0082] x=x set (c)

[0083] Where...

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Abstract

The invention provides a multiple access method based on physical layer network coding, the capacity limit can be achieved through a low-complexity coding and decoding algorithm, the energy spectrum efficiency can be remarkably improved, and the transmission rate can be flexibly adjusted and allocated according to user requirements. A multiple access channel capacity limit can be approached at low cost in both a Gaussian channel and a fading channel. The multiple access method provided by the invention comprises and is compatible with the schemes of IDMA, SCMA, PDMA, NOMA-SIC and the like. The LPNC-MA realizes channel coding, spreading code, sparse coding, modulation and the like of a plurality of users by using one code, so that the LPNC-MA can also be called as a Unified-Coded MA (UCMA) scheme, the performance of approaching channel capacity limit is achieved, and the transmission rate can be flexibly allocated to the users while high spectrum efficiency is kept.

Description

【Technical field】 [0001] Aiming at the problems of inter-user interference and energy spectrum efficiency of multiple access channels in the physical layer of wireless communication, the present invention proposes a flexible and efficient multiple access method based on physical layer network coding, which can approach multiple access channels with low complexity capacity, and approach the lower bound of the outage probability in wireless fading channels, and obtain the improvement of energy spectrum efficiency. The invention belongs to the field of communication, information theory and signal processing. 【Background technique】 [0002] Multiple Access (Multiple-Access, MA) is one of the core technologies in the wireless communication uplink. The 2G-5G mobile communication system adopts Orthogonal Multiple Access technologies such as Time Division Multiple Access, Code Division Multiple-Access (CDMA) and Orthogonal Frequency Division Multiple-Access (OFDMA). -Access, OMA),...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B17/336H04B17/382H04B17/391
CPCH04B17/382H04B17/3911H04B17/336
Inventor 陈秋卓余方涛杨涛刘荣科
Owner BEIHANG UNIV
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