Title :
Code-spread CDMA with interference cancellation
Author :
Frenger, Pål K. ; Orten, Pål ; Ottosson, Tony
Author_Institution :
Dept. of Signals & Syst., Chalmers Univ. of Technol., Goteborg, Sweden
fDate :
12/1/1999 12:00:00 AM
Abstract :
The performance of an asynchronous code division multiple access (CDMA) system (uplink) employing very low-rate maximum free distance codes for combined coding and spreading is analyzed when successive or parallel interference cancellation is applied. An analytical approach to the evaluation of the bit error rate is presented and shown to give results close to simulations. Our results show that the code-spread system outperforms the conventionally coded and spread system. Without interference cancellation the single-user bound is never reached (except for one user). With two stages of parallel interference cancellation, a code-spread system with a load only slightly less than 1 bit/chip can obtain a bit error rate very close to that of a single-user system
Keywords :
channel coding; code division multiple access; convolutional codes; error statistics; interference suppression; multipath channels; multiuser channels; personal communication networks; radiofrequency interference; spread spectrum communication; BER; DS-CDMA; asynchronous CDMA system; bit error rate; channel coding; code division multiple access; code-spread CDMA; coding; convolutional codes; direct-sequence code division multiple access; interference cancellation; low-rate maximum free distance codes; multipath propagation; parallel interference cancellation; simulations; single-user bound; successive interference cancellation; third-generation personal communication systems; uplink; Analytical models; Bit error rate; Channel capacity; Channel coding; Convolutional codes; Detectors; Interference cancellation; Matched filters; Multiaccess communication; Performance analysis;
Journal_Title :
Selected Areas in Communications, IEEE Journal on
