Direct Antenna Modulation (DAM) for Enhanced Capacity Performance of Near-Field Communication (NFC) Link

Shannon's theorem suggests that the capacity of a wireless link is determined by both the power received and the bandwidth of the system. However, in a conventional setup of an inductively coupled near-field communication (NFC) link, there is a trade-off between the power coupled through and the bandwidth. Direct antenna modulation (DAM) is a feasible scheme to mitigate this dilemma. With DAM utilized in a NFC link, the power and bandwidth product limit in a high Q system can be circumvented because the non-linear/time-varying nature of the operation allows high speed modulations decoupled from the charging and discharging process of the high-Q resonator. In this paper, the theory of NFC link with DAM on the transmitter is presented and validated with an experimental setup. Improvement in reception of the high-speed modulation information is observed in the experiment, implying that a superior capacity performance of a NFC link is achieved through DAM versus the traditional scheme.

[1]  Ian F. Akyildiz,et al.  On capacity of magnetic induction-based wireless underground sensor networks , 2012, 2012 Proceedings IEEE INFOCOM.

[2]  M. C. Domingo,et al.  Magnetic Induction for Underwater Wireless Communication Networks , 2012, IEEE Transactions on Antennas and Propagation.

[3]  Y.E. Wang,et al.  Capacity performance of an inductively coupled near field communication system , 2008, 2008 IEEE Antennas and Propagation Society International Symposium.

[4]  Sang Joon Kim,et al.  A Mathematical Theory of Communication , 2006 .

[5]  S Smith,et al.  Development of a miniaturised drug delivery system with wireless power transfer and communication. , 2006, IET nanobiotechnology.

[6]  J. Parkka,et al.  Application of Near Field Communication for Health Monitoring in Daily Life , 2006, 2006 International Conference of the IEEE Engineering in Medicine and Biology Society.

[7]  Y.E. Wang,et al.  Beyond the efficiency bandwidth limit with switched electrically small antennas , 2007, 2007 IEEE Antennas and Propagation Society International Symposium.

[8]  Yuanxun Ethan Wang,et al.  A direct antenna modulation (DAM) transmitter with a switched electrically small antenna , 2010, 2010 International Workshop on Antenna Technology (iWAT).

[9]  W. Liu,et al.  A neuro-stimulus chip with telemetry unit for retinal prosthetic device , 2000, IEEE Journal of Solid-State Circuits.

[10]  Hengzhen Jing Direct antenna modulations for UWB pulse transmission and near field communications , 2009 .

[11]  Xiaojing Xu,et al.  Wideband Pulse Transmission from Switched Electrically Small Antennas , 2007, 2007 IEEE Radio and Wireless Symposium.

[12]  Zhi Sun,et al.  Magnetic Induction Communications for Wireless Underground Sensor Networks , 2010, IEEE Transactions on Antennas and Propagation.

[13]  Y.E. Wang,et al.  High speed pulse radiation from switched electrically small antennas , 2006, 2006 IEEE Antennas and Propagation Society International Symposium.

[14]  U. Azad,et al.  Direct Antenna Modulation scheme for enhanced capacity performance of near-field communication link , 2012, 2012 IEEE International Workshop on Antenna Technology (iWAT).

[15]  Johnson I. Agbinya,et al.  A MAGNETO-INDUCTIVE LINK BUDGET FOR WIRELESS POWER TRANSFER AND INDUCTIVE COMMUNICATION SYSTEMS , 2013 .

[16]  D. Pozar Microwave Engineering , 1990 .

[17]  Özgür B. Akan,et al.  A Communication Theoretical Modeling and Analysis of Underwater Magneto-Inductive Wireless Channels , 2012, IEEE Transactions on Wireless Communications.

[18]  U. Azad,et al.  Link Budget and Capacity Performance of Inductively Coupled Resonant Loops , 2012, IEEE Transactions on Antennas and Propagation.

[19]  Xiaojing Xu Efficient broadband radiation from switched electrically small antennas , 2009 .

[20]  H.G. Schantz A real-time location system using near-field electromagnetic ranging , 2007, 2007 IEEE Antennas and Propagation Society International Symposium.

[21]  T. Bieler,et al.  Contactless power and information transmission , 2001, Conference Record of the 2001 IEEE Industry Applications Conference. 36th IAS Annual Meeting (Cat. No.01CH37248).