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

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...

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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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