Title :
Performance of a turbo coded multicarrier DS/CDMA system with nonuniform repetition coding
Author :
Kim, Yun Hee ; Milstein, Laurence B. ; Song, Iickho
Author_Institution :
Lab. of Radio & Broadcasting Technol., Electron. & Telecommun. Res. Inst., Daejeon, South Korea
fDate :
9/1/2001 12:00:00 AM
Abstract :
This paper presents a turbo coded multicarrier direct sequence code division multiple access (DS/CDMA) system, where the outputs of a turbo encoder are repetition coded at multiple rates and transmitted in parallel over a number of subchannels. A performance bound useful in the so-called error floor region is obtained for Rayleigh fading channels when different diversity orders are given to each turbo code symbol. Simulation results are also provided for the low signal-to-noise ratio (SNR) region where the bound is not applicable. It is observed that the error floor can be lowered, with some performance loss in the low SNR region, by applying nonuniform repetition coding to the turbo code symbols
Keywords :
Rayleigh channels; code division multiple access; decoding; diversity reception; multiuser channels; noise; spread spectrum communication; turbo codes; Rayleigh fading channels; direct sequence code division multiple access; diversity orders; error floor region; low SNR region; low signal-to-noise ratio; nonuniform repetition coding; performance; performance bound; simulation results; subchannels; turbo code symbols; turbo coded multicarrier DS/CDMA system; turbo decoding; turbo encoder; Convolution; Convolutional codes; Direct-sequence code-division multiple access; Euclidean distance; Fading; Interference; Multiaccess communication; Performance loss; Signal to noise ratio; Turbo codes;
Journal_Title :
Selected Areas in Communications, IEEE Journal on
