Title :
Performance of the adaptive rate MQAM with on/off power control
Author :
Lim, Chang Heon ; Cioffi, John M.
Author_Institution :
Dept. of Electron. Eng., Pukyong Nat. Univ., Pusan, South Korea
Abstract :
Goldsmith (see IEEE Trans. Commun., vol.45, p.1218-30, 1997) proposed an adaptive rate MQAM with variable power for a higher transmission rate in a fading channel. However, its successful operation requires a highly linear power amplifier to support its variable transmission power. In this paper, to alleviate this requirement, we present an adaptive rate MQAM with on/off power control. The numerical results show that the proposed scheme has a smaller dynamic range of transmission power than the Goldsmith´s one and suffers from SNR degradation of about 1.3 dB in terms of spectral efficiency when a set of integer rates is employed.
Keywords :
adaptive modulation; fading channels; power amplifiers; power control; quadrature amplitude modulation; telecommunication control; SNR degradation; adaptive modulation; adaptive rate MQAM; fading channel; linear power amplifier; on/off power control; spectral efficiency; transmission power dynamic range; transmission rate; variable transmission power; Adaptive control; Bit error rate; Fading; High power amplifiers; Linearity; Mobile communication; Modulation coding; Operational amplifiers; Power control; Programmable control;
Journal_Title :
Communications Letters, IEEE
DOI :
10.1109/4234.901812
