Wireless communication method for realizing physical layer network coding in multi-user channel

Abstract

The invention provides a wireless communication method for realizing physical layer network coding in a multi-user channel, relates to the field of wireless communication, and aims to realize wireless signal transmission based on physical layer network coding in a network containing a plurality of user nodes but only one relay node. The method comprises the steps that coded bit information of N users is produced, subjected to multiple frequency-shift keying (MFSK) modulation and sent to the relay node; signals are directly added by the relay node to obtain a sum signal, the sum signal is judged and then mapped as network coded information, and the network coded information is subjected to MFSK modulation and then broadcast; the N users respectively conduct MFSK demodulation on a received signal; the relay node broadcasts demodulated information of the users one by one, and the N users respectively conduct MFSK modulation on the demodulated information; and finally, the obtained user information and the network coded information are subjected to bitwise bit exclusive or operation to complete the whole process of physical network coding, thereby realizing wireless communication based on physical layer network coding in the multi-user channel. The wireless communication method is suitable for wireless communication.

Description

technical field [0001] The invention relates to the field of wireless communication. Background technique [0002] Compared with wired communication, the most notable feature of wireless communication is that it has the characteristics of broadcasting, that is, the electromagnetic wave signal sent by one sending node can be received by multiple nodes at the same time. Similarly, a receiving node may also receive signals from multiple sending nodes at the same time. The broadcast characteristic of wireless communication will cause mutual interference between signals, which will have a negative impact on the entire communication process. For example, in a traditional 802.11 network, due to the "interference" phenomenon that a packet of one hop collides with a packet of another adjacent hop in the same service flow, for a network containing multiple hops, its theoretical throughput is still low. Less than 1 / 4 of the single jump. Therefore, in the design process of most wirel...

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