Open AccessThe Performance Improvement of a Multicarrier DS‐CDMA System Using both Time‐Diversity and Frequency Offset
Author(s) -
Kim KiDoo,
Oh JungHun,
Milstein Laurence B.
Publication year - 1999
Publication title -
etri journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.295
H-Index - 46
eISSN - 2233-7326
pISSN - 1225-6463
DOI - 10.4218/etrij.99.0199.0404
Subject(s) - fading , interleaving , diversity scheme , time diversity , computer science , diversity gain , encoder , offset (computer science) , diversity combining , cooperative diversity , code division multiple access , electronic engineering , convolutional code , frequency offset , robustness (evolution) , telecommunications , algorithm , orthogonal frequency division multiplexing , channel (broadcasting) , engineering , decoding methods , biochemistry , chemistry , gene , programming language , operating system
In this paper, we show the robustness of a proposed system using both a frequency diversity and a time diversity effect when the channel assumptions are relaxed such that all subbands are not subject to independent fading. We take time‐repetition coding with interleaving such that the repetition code symbols are spaced sufficiently far apart to guarantee time diversity. We also incorporate offset multicarriers into a proposed multicarrier DS‐CDMA system in a different way compared to that of [10] to reduce the total multiple access interference. When we take a convolutional encoder instead of a time‐repetition encoder, and again use both time diversity and frequency offset, then we can obtain the significant performance gain.