Performance Analysis of Sliding Window Multiuser Detectors used in Asynchronous DS-CDMA Systems.

Samy, Mohamed; El-Dakiky, Mohamed; Shaalan, Islam

doi:10.21608/bfemu.2020.128281

Performance Analysis of Sliding Window Multiuser Detectors used in Asynchronous DS-CDMA Systems.

Document Type : Research Studies

Authors

¹ Electrical Engineering Department., Faculty of Engineering at Port Said., Suez Canal University., Suez., Egypt

² Electrical Engineering Department., Faculty of Engineering at Port Said., Suez Canal University., Egypt

³ Electrical Engineering Department., Faculty of Engineering at Port Said., Suez Canal University.

10.21608/bfemu.2020.128281

Abstract

In this paper, the sliding-window method is applied on both decorrelating and linear minimum mean-squared error (LMMSE) multiuser detectors. The analytical expressions for the error probability of those multiuser detectors (MUDs) are derived. The analysis is presented for asynchronous direct sequence code-division multiple access (DS-CDMA) in additive white Gaussian noise (AWGN) and multipath fading environment. The adopted detectors divide the received signal stream into processing windows and process them window by window. The effects of expanding the processing-window length on the error probabilities are investigated. The analysis shows that the error performance of the decorrelating detector is much better than that of the LMMSE detector when the power of the interfering users is larger than the desired user power. It is also shown that the performance of the presented detectors will be significantly improved with processing-window length up to four symbols.

Keywords