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随着3G技术的深入发展,人们对服务提出了更高的要求,在合法用户获取相应服务的同时,还要保护好用户的隐私。论文主要目的是解决3G用户的位置隐私问题,通过使用一个授权的匿名身份来替代3G中用到的IMSI和TMSI,防止了用户身份和位置信息的暴露。文章采用盲签名来实现身份的隐藏,从而达到了保护位置信息的目的。匿名身份的独立性和基于应用层实现该协议达到了用户对位置隐私的完全控制。 相似文献
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A 2.4 GHz radio frequency receiver front end with an on-chip transformer compliant with IEEE 802.11b/g standards is presented. Based on zero-IF receiver architecture, the front end comprises a variable gain common-source low noise amplifier with an on-chip transformer as its load and a high linear quadrature folded Gilbert mixer. As the load of the LNA, the on-chip transformer is optimized for lowest resistive loss and highest power gain. The whole front end draws 21 mA from 1.2 V supply, and the measured results show a double side band noise figure of 3.75 dB, -31 dBm IIP3 with 44 dB conversion gain at maximum gain setting. Implemented in 0.13 μ m CMOS technology, it occupies a 0.612 mm2 die size. 相似文献
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A 2.4 GHz radio frequency receiver front end with an on-chip transformer compliant with IEEE 802.11b/g standards is presented.Based on zero-IF receiver architecture,the front end comprises a variable gain common-source low noise amplifier with an on-chip transformer as its load and a high linear quadrature folded Gilbert mixer.As the load of the LNA,the on-chip transformer is optimized for lowest resistive loss and highest power gain.The whole front end draws 21 mA from 1.2 V supply,and the measured results show a double side band noise figure of 3.75 dB,-31 dBm IIP3 with 44 dB conversion gain at maximum gain setting.Implemented in 0.13μm CMOS technology,it occupies a 0.612 mm~2 die size. 相似文献
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