Study Of IEEE802.11n And Zigbee Technology Coexistence Based On NC-OFDM

In recent years, many kinds of wireless network communication technology rapiddevelopment.WiFi network and ZigBee network is the most widely used two wirelesscommunication network. WiFi is widely deployed, WiFi network and ZigBee networkoften deployment in the same environment, and with both in2.4GHz ISM (IndustrialScientific Medical) spectrum, when both the use of channel spectrum overlapping lines,will cause mutual interference.This paper discuss the way that WiFi and ZigBee coexist. When802.11n andZigBee sharing frequency, this paper, is proposed based on802.11n physical layer ofCo-work mechanism. Its core thought is:802.11n channel is divided into severalsubchannel, each a subchannel spectral coverage correspond to one ZigBee channel,when ZigBee node using a channel are communicating, WiFi node changes802.11nphysical layer OFDM for NC-OFDM, using the rest of spectrum, so that the spectrumofZigBee and802.11n are non-overlapping, and they can coexist. This paper presentsthe design of the Co-work mechanism. In this mechanism, WiFi nodes detecte thespectrum of the channel on size of subcarriers, to know whether have ZigBee signal inthe same frequency band; This paper identify the subcarrier mode of sending node bythe long traing sequence synchronization method; Design the training bit for differentsubcarrier pattern which correct each OFDM symbol frequency and phase offset real-time, so that the NC-OFDM symbols can be correctly decoded.This article from two aspects of MATLAB simulation and USRP/GNURadioplatform, realize the key technologies of Co-work mechanism. The NC-OFDMtechnology this paper uses is applicable to the traditional SISO (single input singleoutput) system, and is suitable for MIMO (Multiple input Multiple Output) system.