发明授权
- 专利标题: Signal enhancement for load modulation
- 专利标题(中): 负载调制信号增强
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申请号: US14220591申请日: 2014-03-20
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公开(公告)号: US08923921B2公开(公告)日: 2014-12-30
- 发明人: Thomas Busch-Sorensen
- 申请人: Cubic Corporation
- 申请人地址: US CA San Diego
- 专利权人: Cubic Corporation
- 当前专利权人: Cubic Corporation
- 当前专利权人地址: US CA San Diego
- 代理机构: Kilpatrick Townsend & Stockton LLP
- 主分类号: H04M1/00
- IPC分类号: H04M1/00 ; G06K7/10 ; H04B7/24
摘要:
Systems and methods are provided for enhancing a signal for load modulation from reading a smartcard. According to such methods, an antenna signal is generated by transceiver circuitry. An antenna signal field associated with the antenna signal can be transmitted. A reference signal that is substantially constant in amplitude and phase and substantially in phase with a carrier frequency of the antenna signal can be generated. A modulated antenna signal can be received. The modulated antenna signal can include the antenna signal that has been modulated as a result of the presence of a smartcard within the antenna signal field. The reference signal can be subtracted from the modulated antenna signal to produce a resultant signal. The resultant signal may be provided to receiving circuitry of the transceiver circuitry.
公开/授权文献
- US20140287691A1 SIGNAL ENHANCEMENT FOR LOAD MODULATION 公开/授权日:2014-09-25
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