TY - GEN
T1 - A modified QPSK modulation technique for direct antenna modulation (DAM) systems
AU - Zhu, Rui
AU - Ethan Wang, Yuanxun
N1 - Publisher Copyright:
© 2014 IEEE.
PY - 2014/9/18
Y1 - 2014/9/18
N2 - Direct antenna modulation (DAM) has been proposed to overcome the bandwidth limitation of high Q resonating antennas by decoupling the stored energy from the coupled or radiated energy. It, however, due to its switching nature, imposes a zero voltage or zero current switching condition to the modulation technique at the symbol transition in order to achieve high radiation efficiency. Simple on-off keying (OOK) based on monocycle RF pulses was used in the past. In this paper, higher order phase shift keying modulation techniques are proposed for DAM systems. The so-called modified QPSK modulation technique can maintain zero current switching conditions at the symbol transitions while creating the four quadrant phases to represent different symbols. Simulations for a near field communication (NFC) system employing such modulation techniques have demonstrated better transmission performance judged by the eye diagrams.
AB - Direct antenna modulation (DAM) has been proposed to overcome the bandwidth limitation of high Q resonating antennas by decoupling the stored energy from the coupled or radiated energy. It, however, due to its switching nature, imposes a zero voltage or zero current switching condition to the modulation technique at the symbol transition in order to achieve high radiation efficiency. Simple on-off keying (OOK) based on monocycle RF pulses was used in the past. In this paper, higher order phase shift keying modulation techniques are proposed for DAM systems. The so-called modified QPSK modulation technique can maintain zero current switching conditions at the symbol transitions while creating the four quadrant phases to represent different symbols. Simulations for a near field communication (NFC) system employing such modulation techniques have demonstrated better transmission performance judged by the eye diagrams.
UR - http://www.scopus.com/inward/record.url?scp=84907880400&partnerID=8YFLogxK
U2 - 10.1109/APS.2014.6905122
DO - 10.1109/APS.2014.6905122
M3 - Conference contribution
AN - SCOPUS:84907880400
T3 - IEEE Antennas and Propagation Society, AP-S International Symposium (Digest)
SP - 1592
EP - 1593
BT - 2014 IEEE Antennas and Propagation Society International Symposium(APSURSI)
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 2014 IEEE Antennas and Propagation Society International Symposium, APSURSI 2014
Y2 - 6 July 2014 through 11 July 2014
ER -