Research And Implementation On Key Technology Of Intermidiate Frequency For 10Gbps Wi-Fi Uplink

Under the strategy of “Wisdom City” and “Broadband China”, Wi-Fi has penetrated into every aspect of people’s life. Surge in kinds of mobile terminal equipment usage, makes 2.4GHz spectrum more crowded. To improve the quality of Wi-Fi signal and effect of users’ experience, and satisfy the growing demand of Wi-Fi,802.11 ac shifts its spectrum range from 2.4GHz junk band to 5GHz. Also, 802.11 ac supports the available bandwidth of 80 MHz and 160 MHz. The impressive maximum data rate of 802.11 ac is 6.9Gbps, which is more than 600 Mbps in 802.11 n.However, spectrum resource in 5GHz is relatively clean and co-channel interference in 5GHz is small. Making full use of massive capacity advantage of 5GHz spectrum to get a higher data rate becomes a research direction of next generation of Wi-Fi.Purpose of research on 10 Gbps Wi-Fi is to validate the key technology of next generation of Wi-Fi which is a Real-time processing system containing ultra-wideband and very high throughput. The ultra-wideband is 645 MHz including 400 MHz effective spectrum, while the very high throughput is 10 Gbps or more. This thesis is devoted to research and implementation of IF key technology in uplink of 10 Gbps Wi-Fi system.Mainly work is as following.(1) Based on design requirements of 10 Gbps Wi-Fi, and combined with digital intermediate frequency signal processing techniques, including multi-rate digital signal processing, poly-phase filtering and high-speed data acquisition technology, this thesis gives the cascade poly-phase filtering structure and in-band flatness correction method, and completes the design of IF processing scheme;(2) According to uplink IF processing scheme, combined with downlink IF processing, this thesis gives the Matlab simulation of IF processing solution, and then completes the realization of this FPGA project which is based on simulation and includes corresponding FPGA processing module;(3) This thesis completes the validation and analysis of uplink IF processing scheme on BEE7. It’s verified that while DA works at 1.92 GHz, center frequency of DA’s output is 1.44 GHz and its wideband is 645 MHz, and SNR reaches to54.47 d B or more. After IF loopback test, EVM can reach at 0.49% and the total data rate is 10.53 Gbps while test condition is eight channels and 64 QAM.The thesis accomplishes the design and realization of uplink IF processing scheme of 10 Gbps Wi-Fi, and verifies its feasibility by functional and performance test.Combined with downlink IF processing and under the condition of 64 QAM, the data rate reaches up to 10.53 Gbps and EVM is 0.49%. The research of this thesis provides a reliable basis for studying the IF key technology in the next generation of Wi-Fi.