Symbol-based physical-layer network coding method for two-way relay communication system

A technology of network coding and communication system, applied in the field of two-way relay physical layer network coding and physical layer network coding

Inactive Publication Date: 2012-01-25
BEIJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

There are few reports on the general MIMO-PNC scheme under the MPSK modulation mode

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  • Symbol-based physical-layer network coding method for two-way relay communication system
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  • Symbol-based physical-layer network coding method for two-way relay communication system

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Embodiment Construction

[0016] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0017] see figure 1 , introduces the application scenario of the method of the present invention: three-node two-way relay communication system, wherein, two source nodes Node 1 and Node 2 There are two communication users in the network system, and each source node is equipped with a single antenna. Two-way relay node Node 3 The number of antennas L=2. User Node at both ends i To relay node Node 3 The two channel matrices h i Each element in is independent and identically distributed, that is, its elements obey Distribution, that is, a random variable that satisfies a complex Gaussian distribution with a mean of 0 and a variance of 1; and h i ∈ C L×1 , where C is a set of complex numbers, C L×1 Represents a set of complex matrices with ...

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Abstract

The invention discloses a symbol-based physical-layer network coding method for a two-way relay communication system. The method comprises the following steps that: in a first time slot, during the receiving of information through a relay node, two source nodes send respective modulated signals to the relay node respectively, and the relay node performs self-correlation operation on the received superposed signals to obtain a self-correlation matrix and detects a network coding symbol to be broadcast from the self-correlation matrix by using a maximum-likelihood (ML) detection algorithm to reduce a detection space of the network coding symbol, so the difficulty of signal detection is reduced, a receiving diversity gain is obtained, and the error code performance of the system is guaranteed; and in a second time slot, during the broadcasting of the information through the relay node, the relay node broadcasts the detected network coding symbol, and the two source nodes respectively decode the received signals by using a self-interference elimination method to obtain the information of the opposite-side node, so a communication process is finished. The invention has the advantages that: the operation complexity of a relay processing signal is reduced by using the characteristics of an M-ary phase shift keying (MPSK) signal; the receiving diversity gain is obtained; and the method is applicable to an MPSK modulation system at symmetric and asymmetric speed rates under a two-way relay channel.

Description

technical field [0001] The invention relates to a symbol-based physical layer network coding method for a two-way relay system, to be precise, relates to a two-way relay physical layer network coding method suitable for MPSK modulation at any rate, and belongs to wireless communication technology field. Background technique [0002] Two-way communication means that both ends of the communication can send and receive information, which is a common means of communication. For example, real-time file interaction between users, video calls, and dedicated surveillance systems all require reliable two-way communication. Due to the geographical distance or the poor quality of the direct transmission channel, users who expect to realize two-way communication are often unable to form a network by themselves to achieve reliable communication. At this time, a relay is usually used to assist in two-way communication. Physical layer network coding utilizes the broadcast and superposit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00H04L1/06
Inventor 吕铁军曹若菡
Owner BEIJING UNIV OF POSTS & TELECOMM
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