Title :
Wireless portable communications using pre-RAKE CDMA/TDD/QPSK systems with different combining techniques and imperfect channel estimation
Author :
El-Khamy, Said E. ; Sourour, Essam E. ; Kadous, Tamer A.
Author_Institution :
Dept. of Electr. Eng., Alexandria Univ., Egypt
Abstract :
This paper studies the use of pre-RAKE combining technique in code-division multiple-access (CDMA) systems with QPSK carrier modulation and time division duplex (TDD) in wide-band wireless portable communication systems. The system performance is analyzed in a generalized Rayleigh fading multipath channel. Our analysis is focused on two main issues. The first issue is comparing the various diversity techniques and studying the effect of the diversity order. Two diversity combining techniques, namely, maximal ratio combing (MRC) and equal gain combing (EGC) supplemented by a selection diversity for the strongest paths in gain are examined. The second considered issue is studying the effect of imperfect channel estimation on the system performance and comparing it with the ideal QPSK pre-RAKE system
Keywords :
Rayleigh channels; broadband networks; code division multiple access; diversity reception; error statistics; fading; land mobile radio; multipath channels; parameter estimation; probability; quadrature phase shift keying; radio networks; radio receivers; spread spectrum communication; DS-CDMA; DS-SS; QPSK carrier modulation; code-division multiple-access; diversity combining techniques; diversity order; equal gain combing; error analysis; generalized Rayleigh fading multipath channel; imperfect channel estimation; maximal ratio combing; pre-RAKE CDMA/TDD/QPSK systems; probability; selection diversity; system performance; time division duplex; wideband wireless portable communication systems; Diversity reception; Modulation coding; Multiaccess communication; Multipath channels; Performance analysis; Quadrature phase shift keying; Rayleigh channels; System performance; Wideband; Wireless communication;
Conference_Titel :
Personal, Indoor and Mobile Radio Communications, 1997. Waves of the Year 2000. PIMRC '97., The 8th IEEE International Symposium on
Conference_Location :
Helsinki
Print_ISBN :
0-7803-3871-5
DOI :
10.1109/PIMRC.1997.631069
