Title :
Combined effect of chip interleaving and frequency domain equalization for DS-CDMA
Author :
Garg, Deepshikha ; Adachi, Fumiyuki
Author_Institution :
Dept. of Electr. & Commun. Eng., Tohoku Univ., Japan
Abstract :
DS-CDMA with frequency domain minimum mean square error (MMSE) equalization can provide much better performance than that with rake combining in a frequency selective fading channel. When frequency domain equalization is used, the frequency selectivity of the channel is thoroughly exploited. Chip interleaving is a form of channel interleaving that improves the DS-CDMA performance by converting the channel into a highly time selective channel. In this paper, we apply chip interleaving to DS-CDMA with frequency domain MMSE equalization to see if the performance can be further improved. It is found that chip interleaving improves the performance for all channel conditions. In addition, chip interleaving is beneficial in the presence of turbo coding and antenna diversity as well.
Keywords :
code division multiple access; diversity reception; equalisers; fading channels; least mean squares methods; turbo codes; DS-CDMA; MMSE equalization; antenna diversity; channel interleaving; chip interleaving; direct sequence code division multiple access; frequency domain equalization; frequency domain minimum mean square error equalization; frequency selective fading channel; time diversity effect; time selective channel; turbo coding; Bit error rate; Degradation; Diversity reception; Fading; Frequency domain analysis; Interleaved codes; Mean square error methods; Mobile communication; Multiaccess communication; Turbo codes;
Conference_Titel :
Vehicular Technology Conference, 2004. VTC 2004-Spring. 2004 IEEE 59th
Print_ISBN :
0-7803-8255-2
DOI :
10.1109/VETECS.2004.1387990
