A Multiple Access Method Based on Physical Layer Network Coding

A network coding and access method technology, applied in transmission monitoring, electrical components, transmission systems, etc., can solve the problems of inflexible allocation of user rate resources, inability to reach channels, etc., to achieve miniaturization, reduce calculation load, and performance Enhanced effect

Active Publication Date: 2022-07-15
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

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  • A Multiple Access Method Based on Physical Layer Network Coding
  • A Multiple Access Method Based on Physical Layer Network Coding
  • A Multiple Access Method Based on Physical Layer Network Coding

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Embodiment Construction

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

[0079] Preliminary preparation

[0080] 1. Non-equidistant constellation point mapping

[0081] The expression for the equidistant q-PAM modulation has been given in step 3 of the technical solution. In the following specific implementation, not only the equidistant q-PAM modulation, but also the 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 the ratio of the distance from the origin to the closest point to the distance from the origin to the outermost point is set to ρ (0 where γ is used to normalize the energy. The mapping relationship can be expressed as

[008...

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Abstract

The present invention proposes a multiple access method based on physical layer network coding, which can reach the capacity limit with a low-complexity coding and decoding algorithm and significantly improve the energy spectrum efficiency, and can flexibly adjust the allocated transmission rate according to user requirements. The capacity limit of multiple access channels can be approached at low cost in both Gaussian channels and fading channels. The multiple access method of the present invention includes and is compatible with IDMA, SCMA, PDMA, NOMA-SIC and other schemes downward. Because LPNC-MA can realize channel coding, spreading code, sparse coding, modulation, etc. of multiple users with one code, it can also be called a unified coded multiple access (Unified-Coded MA, UCMA) scheme , to achieve the performance approaching the channel capacity limit, and to flexibly allocate the transmission rate to users while maintaining high spectral efficiency.

Description

【Technical field】 [0001] Aiming at the problems of inter-user interference and energy spectrum efficiency of the multiple access channel in the wireless communication physical layer, the present invention proposes a flexible and efficient multiple access method based on physical layer network coding, which can approximate the multiple access channel with low complexity capacity, and approach the lower bound of outage probability in wireless fading channel, and obtain the improvement of energy spectrum efficiency. The invention belongs to the fields 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 & AuthorityPatents(China)
IPC IPC(8): H04B17/336H04B17/382H04B17/391
CPCH04B17/382H04B17/3911H04B17/336
Inventor陈秋卓余方涛杨涛刘荣科
OwnerBEIHANG UNIV