Open AccessDiscrete‐input continuous‐output memoryless channel capacity of cooperative hierarchical modulation
Author(s) -
Sun Hua,
Ng Soon Xin,
Hanzo Lajos
Publication year - 2016
Publication title -
iet communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.355
H-Index - 62
eISSN - 1751-8636
pISSN - 1751-8628
DOI - 10.1049/iet-com.2015.0359
Subject(s) - channel (broadcasting) , computer science , node (physics) , modulation (music) , relay , constellation , quadrature amplitude modulation , flexibility (engineering) , spectral efficiency , signal to noise ratio (imaging) , topology (electrical circuits) , telecommunications , constellation diagram , mathematics , bit error rate , statistics , physics , acoustics , power (physics) , quantum mechanics , astronomy , combinatorics
Hierarchical modulation (HM) is a layered modulation scheme, which is widely employed by the telecommunication industry. The higher flexibility and lower complexity of the HM scheme has its dramatic benefits for wireless communications, hence the achievable performance of cooperation‐aided coded HM has drawn substantial research interests. In this study, a triple‐layer HM‐aided four‐node cooperative communication system is proposed, and its discrete‐input continuous‐output memoryless channel capacity is derived, which is used for finding the optimal position of the relay nodes as well as to design appropriate HM constellations. The authors’ simulation results show that if a rate‐1/2 ‘perfect’ channel code is assumed, the four‐node network becomes capable of conveying a coded HM‐64QAM signal in three time slots at an average signal‐to‐noise ratio of −0.71 dB.