Physical-layer network coding detection method in bidirectional MIMO relay channel

Abstract

The invention relates to a physical-layer network coding detection method in a bidirectional multiple input multiple output (MIMO) relay channel. The method is divided into a primary detection stage and a secondary detection stage, wherein a zero-forcing detection or joint zero-forcing detection algorithm is adopted at the primary detection stage to obtain a judgment initial value of information of a relay node; and the secondary detection stage comprises the following steps of: detecting the sum of information of two information source nodes if the judgment initial value is +1, determining initial judgment if the detection result is +1, detecting the difference of the information of the two information source nodes if the detection result is -1, correcting the initial judgment if the detection result is -1, maintaining the initial judgment if the detection result is +1, and finishing the updating process; and detecting the difference of the information of the two information source nodes if the judgment initial value is -1, determining the initial judgment if the detection result is -1, detecting the sum of the information of the two information source nodes if the detection result is +1, correcting the initial judgment if the detection result is +1, maintaining the initial judgment if the detection result is -1, and finishing the updating process.

Description

technical field [0001] The invention relates to a detection method in a bidirectional MIMO relay channel. Background technique [0002] Introducing the relay into the wireless communication network can achieve many advantages such as improving spectrum efficiency, increasing coverage area and saving wireless resources. A two-way relay channel is a typical transmission channel, and its simple model is that two source nodes exchange information through a relay node. Traditionally, four stages are required to complete a data exchange in a time division duplex (TDD) system. In order to improve resource utilization, people introduce network coding to improve spectrum efficiency. Using digital network coding (digital network coding, DNC), an information exchange can be completed in only three stages. If analog network coding (ANC) or physical-layer network coding (PNC) is used, an information exchange can be completed in only two stages. Digital network coding adopts decoding ...

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Problems solved by technology

However, compared with zero-forcing detection, this method requires the noise variance information of the known system, which brings additional overhead to the zero-forcing detection method, which is recorded as joint zero-forcing detection; compared with the minimum mean square error detection, this method is due to the introduction of The likelihood ratio function has a high complexity, which is recorded as the joint minimum mean square error detection

Therefore, for the two-way MIMO relay channel, the detection method is designed on the zero-forcing detection method to further improve the detection performance of the relay node, without the need to know the noise variance information of the system, or to increase the lower complexity to further improve the relay node The detection performance will be more in line with practical applications, but such research and methods have never appeared

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