Abstract
It is well-known that, in DS-CDMA downlink signal transmission, frequency-domain equalization (FDE) based on minimum mean square error (MMSE) criterion can replace rake combining to achieve much improved bit error rate (BER) performance in severe frequency-selective fading channel. However, in uplink signal transmission, as each user's signal goes through a different channel, a severe multi-user interference (MUI) is produced and the uplink BER performance severely degrades compared to the downlink. When a small spreading factor is used, the uplink BER performance further degrades due to inter-chip interference (ICI). In this paper, we propose a frequency-domain multi-stage soft interference cancellation scheme for the DS-CDMA uplink and the achievable BER performance is evaluated by computer simulation. The BER performance comparison of the proposed cancellation technique and the multiuser detection (MUD) is also presented.
| Original language | English |
|---|---|
| Pages (from-to) | 1152-1161 |
| Number of pages | 10 |
| Journal | IEICE Transactions on Communications |
| Volume | E90-B |
| Issue number | 5 |
| DOIs | |
| Publication status | Published - 2007 May |
| Externally published | Yes |
Keywords
- DS-CDMA
- Frequency-domain equalization (FDE)
- MUI cancellation
- Multi-user detection (MUD)
ASJC Scopus subject areas
- Software
- Computer Networks and Communications
- Electrical and Electronic Engineering