Title :
Direct Antenna Modulation scheme for enhanced capacity performance of near-field communication link
Author :
Azad, Umar ; Wang, Yuanxun Ethan
Author_Institution :
Dept. of Electr. Eng., Univ. of California, Los Angeles, CA, USA
Abstract :
Shannon theorem suggests that power coupled through and bandwidth of an inductively coupled near field communication (NFC) link must be traded off for optimal capacity. Direct Antenna Modulation (DAM) is a possible scheme to break this dilemma. With DAM technology utilized in NFC link, the power and bandwidth product limit in a high Q system can be circumvented because of non-linear/time varying operation. In this paper, a NFC link, consisting of identical transmitter and receiver coils of 5 cm radius and 24 turns with a Q value of 35, operating at 283 kHz is used. DAM is implemented on transmitter side and improvement in capacity is experimentally demonstrated for low loaded Q receiver.
Keywords :
HF antennas; information theory; modulation; near-field communication; radio links; DAM technology; NFC link; Shannon theorem; bandwidth product limit; direct antenna modulation scheme; enhanced capacity performance; frequency 283 kHz; high Q system; identical transmitter; inductively coupled near field communication link; low loaded Q receiver; near-field communication link; radius 5 cm; receiver coils; Antennas; Capacitors; Coils; Frequency modulation; Receivers; Switches;
Conference_Titel :
Antenna Technology (iWAT), 2012 IEEE International Workshop on
Conference_Location :
Tucson, AZ
Print_ISBN :
978-1-4673-0036-0
DOI :
10.1109/IWAT.2012.6178405
