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Space-Time Concatenated Convolutional and Differential Codes with Interference Suppression for DS-CDMA Systems  

Yang, Ha-Yeong (University of Sydney, School of Electrical and Information Engineering)
Sin, Min-Ho (Dept.of Electric Electronics Engineering, Yonsei University)
Song, Hong-Yeop (Dept.of Electric Electronics Engineering, Yonsei University)
Hong, Dae-Sik (Dept.of Electric Electronics Engineering, Yonsei University)
Gang, Chang-Eon (Dept.of Electric Electronics Engineering, Yonsei University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea TC / v.39, no.1, 2002 , pp. 1-10 More about this Journal
Abstract
A space-time concatenated convolutional and differential coding scheme is employed in a multiuser direct-sequence code-division multiple-access(DS-CDMA) system. The system consists of single-user detectors (SUD), which are used to suppress multiple-access interference(MAI) with no requirement of other users' spreading codes, timing, or phase information. The space-time differential code, treated as a convolutional code of code rate 1 and memory 1, does not sacrifice the coding efficiency and has the least number of states. In addition, it brings a diversity gain through the space-time processing with a simple decoding process. The iterative process exchanges information between the differential decoder and the convolutional decoder. Numerical results show that this space-time concatenated coding scheme provides better performance and more flexibility than conventional convolutional codes in DS-CDMA systems, even in the sense of similar complexity Further study shows that the performance of this coding scheme applying to DS-CDMA systems with SUDs improves by increasing the processing gain or the number of taps of the interference suppression filter, and degrades for higher near-far interfering power or additional near-far interfering users.
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