Title :
Adaptive modulation and power allocation for multicarrier DS/CDMA
Author :
Zhang, Zhongpei ; Zhao, Yahong ; Ya, Yan
Author_Institution :
State Key Lab on Microwave & Digital Commun., Tsinghua Univ., Beijing, China
fDate :
29 June-1 July 2002
Abstract :
To satisfy the request for high data rate and high frequency efficiency for new generation communication systems, an adaptive modulation method, subcarrier and power allocation is proposed for multicarrier DS/CDMA systems. With the downlink channel parameter acquired from the uplink channel feedback, an optimization algorithm is utilized to maximize frequency efficiency and minimize the required transmitting power for a given QoS and data throughput. Compared with non-adaptive OFDM system, the required transmitting power is greatly decreased and the convergence rate of this algorithm is very high which makes it very appropriate for engineering applications.
Keywords :
adaptive modulation; code division multiple access; convergence of numerical methods; mobile radio; optimisation; quadrature amplitude modulation; quadrature phase shift keying; spread spectrum communication; 16-QAM; 64-QAM; MC-CDMA; QPSK; QoS; adaptive modulation; convergence rate; data throughput; downlink channel; frequency efficiency; high data rate; multicarrier DS-CDMA systems; optimization algorithm; power allocation; subcarrier allocation; transmitting power; uplink channel feedback; Adaptive systems; Convergence; Downlink; Feedback; Multiaccess communication; OFDM modulation; Power engineering and energy; Power generation; Radio spectrum management; Throughput;
Conference_Titel :
Communications, Circuits and Systems and West Sino Expositions, IEEE 2002 International Conference on
Print_ISBN :
0-7803-7547-5
DOI :
10.1109/ICCCAS.2002.1180612
