TY - GEN
T1 - Asynchronous classification of high-order QAMs
AU - Shi, Qinghua
AU - Gong, Yi
AU - Guan, Yong Liang
PY - 2008
Y1 - 2008
N2 - Conventional modulation classification (MC) schemes usually assume that perfect synchronization has been accomplished and then rely on certain statistical characteristics to distinguish different modulation formats. In practice, however, this perfect synchronization assumption is not reasonable since modulation classifiers operate in a non-cooperative manner and therefore, the receiver has little prior knowledge about the transmitted signals and no training is available. In this paper, we first address asynchronous MC for high-order QAMs through blind time synchronization. A characteristic function (CF) based approach is proposed to improve the performance of the conventional cumulant method. We then move on to consider asynchronous MC with frequency offset. We propose a hybrid MC scheme based on blind time synchronization, differential processing, and cumulants to solve this difficult problem.
AB - Conventional modulation classification (MC) schemes usually assume that perfect synchronization has been accomplished and then rely on certain statistical characteristics to distinguish different modulation formats. In practice, however, this perfect synchronization assumption is not reasonable since modulation classifiers operate in a non-cooperative manner and therefore, the receiver has little prior knowledge about the transmitted signals and no training is available. In this paper, we first address asynchronous MC for high-order QAMs through blind time synchronization. A characteristic function (CF) based approach is proposed to improve the performance of the conventional cumulant method. We then move on to consider asynchronous MC with frequency offset. We propose a hybrid MC scheme based on blind time synchronization, differential processing, and cumulants to solve this difficult problem.
UR - http://www.scopus.com/inward/record.url?scp=51649130386&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=51649130386&partnerID=8YFLogxK
U2 - 10.1109/wcnc.2008.214
DO - 10.1109/wcnc.2008.214
M3 - Conference contribution
AN - SCOPUS:51649130386
SN - 9781424419968
T3 - IEEE Wireless Communications and Networking Conference, WCNC
SP - 1188
EP - 1193
BT - WCNC 2008 - IEEE Wireless Communications and Networking Conference, Conference Proceedings
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - IEEE Wireless Communications and Networking Conference, WCNC 2008
Y2 - 31 March 2008 through 3 April 2008
ER -