Title :
Power and bandwidth-efficient circular M-ARY APK schemes with low PAR
Author :
Vo, Thai Hoa ; Le-Ngoc, Tho
Author_Institution :
Dept. of Electr. & Comput. Eng., McGill Univ., Montreal, Que., Canada
Abstract :
This paper presents a class of circular M-ary amplitude-phase shift keying (APK) signaling techniques with high bandwidth efficiency and low peak-to-average power ratio (PAR) suitable for systems using nonlinear power amplifiers to achieve high power efficiency. Based on bandlimited two-dimensional M-ary signals using circular constellations, we develop a search algorithm for optimum schemes for nonlinear amplification in terms of minimum PAR and maximum DPR. Optimum circular constellations for 16-, 64- and 128-APK signalling schemes are proposed. The effects of bandlimiting filter sharpness on the PAR are examined and considered in the development. The analytical and simulation results show that this class of circular M-ary APK signals outperforms the square and cross M-ary QAM schemes.
Keywords :
amplitude shift keying; bandlimited signals; filtering theory; phase shift keying; power amplifiers; telecommunication signalling; bandlimited signal; bandlimiting filter sharpness; bandwidth efficiency; bandwidth-efficient circular M-ARY APK scheme; circular M-ary amplitude-phase shift keying signaling technique; circular constellation; distance-average power ratio; low peak-average power ratio; nonlinear amplification; nonlinear power amplifier; power efficiency; power efficient constellation; search algorithm; Analytical models; Bandwidth; Constellation diagram; Filtering; Filters; High power amplifiers; Peak to average power ratio; Quantization; Signal design; Transmitters;
Conference_Titel :
Electrical and Computer Engineering, 2003. IEEE CCECE 2003. Canadian Conference on
Print_ISBN :
0-7803-7781-8
DOI :
10.1109/CCECE.2003.1226195
