Wideband OFDM Transceiver Development Based On AD9361

In high-speed wideband wireless communication,inter-symbol interference(ISI)is a common issue,it occurs when a transmission interferes with itself in multi-path environment,result in receiver decode failure.OFDM can overcome ISI,it is the physical layer core technology of both 4G and 5G.Today,Small size densely deployment and wideband high data rate is the technical trend of wireless communication,the demand of LTE small cell and handheld device increases rapidly espcailly for the indoor coverage,emergency communication and so on.Traditional transceiver is always big,heavy and expensive,even pico-RRU is still too big to fulfill the requirements of small cell or handheld wireless communication device.Focus on the market requirements of small size,light weight and low cost,a kind of handheld wideband OFDM transceiver is designed and implemented in this project,and a real gap in the market is filled.In this project,based on AD9361,a kind of wideband OFDM transceiver core module is designed and implemented;together with clock synchronization circuit,low noise amplifier(LNA)circuit and control & interface circuit,the transceiver is constructed.Four key technical issues are resolved in this project: clock synchronization technology based on AD9516,low noise technology,high sensitivity receiver technology and AD9361 configuration technology.Test is the most important criteria for output quality,the system test environment,method are also defined for this project.Finally a small size,high performance and low cost transceiver sample is released.Its size is 18 cm ~* 10 cm ~* 2cm,weight is about 500g;Downlink EVM is below 3%,better than the requirement of 8% from 3GPP;Uplink receiver Reference sensitive is better than-93.5dBm when 10 MHz bandwidth;and most important,its cost is no more than one thousand RMB.