Title :
Novel detection technique for DS-CDMA with frequency domain oversampling
Author :
Liu, Liang ; Shao, Dingrong ; Guan, Yongliang ; Bi, Guoan
Author_Institution :
Sch. of Electron. & Inf. Eng., Beihang Univ., Beijing, China
Abstract :
In synchronous DS-CDMA systems, multi-access interference (MAI) due to severe frequency-selective fading degrades the system performance. Based on the frequency domain oversampling (FDO) and minimum mean-square error (MMSE) principle, a novel linear per-user MMSE detector is proposed to approximately restore the orthogonality among the spreading sequences and suppress the MAI. Based on a discussion on the optimal MMSE detector, a low complexity diagonal MMSE detector is proposed with only a slight degradation in performance. It is shown by numerical results that the proposed detector obviously outperforms the conventional linear MMSE detector in severe MAI environment.
Keywords :
code division multiple access; fading; least mean squares methods; radiofrequency interference; spread spectrum communication; DS-CDMA; frequency domain oversampling; frequency-selective fading grades; linear per-user MMSE detector; minimum mean-square error; multiaccess interference; Bit error rate; Detectors; Downlink; Fading; Frequency division multiaccess; Frequency domain analysis; Multiaccess communication; Multicarrier code division multiple access; Multiple access interference; Peak to average power ratio; Direct sequence code-division multiple access (DS-CDMA); frequency domain oversampling (FDO); per-user MMSE detector;
Conference_Titel :
Information, Communications and Signal Processing, 2009. ICICS 2009. 7th International Conference on
Conference_Location :
Macau
Print_ISBN :
978-1-4244-4656-8
Electronic_ISBN :
978-1-4244-4657-5
DOI :
10.1109/ICICS.2009.5397647
