Title :
On the spectral efficiency of wideband CDMA systems
Author :
Noneaker, Daniel L.
Author_Institution :
Dept. of Electr. & Comput. Eng., Clemson Univ., SC, USA
fDate :
1/1/2001 12:00:00 AM
Abstract :
The reverse-link spectral efficiency is evaluated for a direct-sequence (DS) code division multiple access (CDMA) cellular communication system that employs rapid closed-loop power control and coding with interleaving on channels that exhibit doubly selective Rician fading. The focus of the paper is the effect of the chip rate of the DS spread-spectrum signal on the spectral efficiency of the system. Performance is considered for systems with different numbers of demodulators in the RAKE receiver and for systems both with and without antenna diversity. Channels with different delay spectra and Doppler spreads are used to examine the performance of the system in various operating conditions. The implications of the results for the design of wideband CDMA are discussed
Keywords :
Doppler effect; Rician channels; broadband networks; cellular radio; closed loop systems; code division multiple access; delays; demodulators; diversity reception; interleaved codes; multiuser channels; power control; radio networks; radio receivers; spectral analysis; spread spectrum communication; telecommunication control; DS spread-spectrum signal; DS-CDMA cellular communication system; Doppler spreads; RAKE receiver; antenna diversity; chip rate; closed-loop power control; coding; delay spectra; demodulators; direct-sequence code division multiple access; doubly selective Rician fading; interleaving; reverse-link spectral efficiency; spectral efficiency; system performance; wideband CDMA systems; Demodulation; Fading; Interleaved codes; Multiaccess communication; Multipath channels; Power control; Receiving antennas; Rician channels; Spread spectrum communication; Wideband;
Journal_Title :
Selected Areas in Communications, IEEE Journal on
