Title :
Set-theoretic DS/CDMA receivers for fading channels by adaptive projected subgradient method
Author :
Cavalcante, Renato L G ; Yukawa, Masahiro ; Yamada, Isao
Author_Institution :
Dept. of Commun. & Integrated Syst., Tokyo Inst. of Technol.
Abstract :
This paper presents a family of multiple access interference (MAI) suppression receivers based on the adaptive projected subgradient method. The proposed scheme can be applied to many different channel models and modulations in a unified manner. Moreover, it is suitable for both blind and nonblind receivers. The adaptive projected subgradient method realizes excellent convergence to a set including an optimal solution with high probability by asymptotically minimizing a sequence of nonnegative convex functions. Simulation results show much better (variable) tradeoff between speed and performance at steady-state as compared to existing techniques
Keywords :
code division multiple access; fading channels; gradient methods; interference suppression; radio receivers; radiofrequency interference; spread spectrum communication; DS-CDMA receivers; adaptive projected subgradient method; blind receivers; fading channels; multiple access interference suppression; nonblind receivers; nonnegative convex functions; Adaptive filters; Binary phase shift keying; Communications technology; Computational modeling; Cost function; Covariance matrix; Fading; Multiaccess communication; Multiple access interference; Quadrature amplitude modulation;
Conference_Titel :
Global Telecommunications Conference, 2005. GLOBECOM '05. IEEE
Conference_Location :
St. Louis, MO
Print_ISBN :
0-7803-9414-3
DOI :
10.1109/GLOCOM.2005.1578068
