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Eliminate the Influence of SMPS Ripple Noise for WiFi Receiver with LMS Algorithms
ZHANG Yan,BU Gang,WANG Mingming
Electronic Science and Technology    2019, 32 (1): 11-15.   DOI: 10.16180/j.cnki.issn1007-7820.2019.01.003
Abstract   (413 HTML6 PDF(pc) (1610KB)(36)  

Aim

ing at the problem of ripple when the switching mode power supply was applied to the RF front-end analog circuit, a scheme of eliminating ripple in the digital baseband by using adaptive filtering was proposed. WiFi transceiver system based on IEEE802.11b wireless communication protocol was established by using simulink, and LMS adaptive filter was utilized in digital baseband to suppress the ripple. Simulation results showed that the signal quality could be significantly improved by the adaptive filter. When the ripple amplitude was within 150 mV, the received signal could meet the protocol requirements. Based on these results, an adaptive filter was designed, including both front end and layout. The power consumption analysis showed that the final adaptive filter consumed only 1.35 mW at 33 MHz clock frequency and 1.98 V supply voltage, validating the possibility of using switching mode power supplies for WIFI receivers to achieve significant power savings.


纹波幅度 0 mV 100 mV 200 mV
未滤波 滤波 未滤波 滤波 未滤波 滤波
比较码元数 1 191
误码数 0 0 537 3 855 378
误码率 0 0 45.1% 0.03% 71.8% 31.7%
信号质量是否合格 合格 合格 不合格 合格 不合格 不合格
Table 1 WiFi transceiver system simulation results
Extracts from the Article
根据IEEE802.11b协议规定,接收机的误码率应当小于0.1%。开关电源纹波通过从接收端耦合来模拟,频率设置为100 kHz,调整幅度并进行仿真,结果如表1所示。
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