Abstract
Frequency-domain equalization (FDE) based on the minimum mean square error (MMSE) criterion can provide better downlink bit error rate (BER) performance of direct sequence code division multiple access (DS-CDMA) than the conventional rake combining in a frequency-selective fading channel. FDE requires accurate channel estimation. In this paper, we propose a new 2-step maximum likelihood channel estimation (MLCE) for DS-CDMA with FDE in a very slow frequency-selective fading environment. The 1st step uses the conventional pilot-assisted MMSE-CE and the 2nd step carries out the MLCE using decision feedback from the 1st step. The BER performance improvement achieved by 2-step MLCE over pilot assisted MMSE-CE is confirmed by computer simulation.
Original language | English |
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Pages (from-to) | 2065-2071 |
Number of pages | 7 |
Journal | IEICE Transactions on Communications |
Volume | E92-B |
Issue number | 6 |
DOIs | |
Publication status | Published - 2009 Jun |
Keywords
- Channel estimation
- DS-CDMA
- Frequency-domain equalization
- MMSE
ASJC Scopus subject areas
- Software
- Computer Networks and Communications
- Electrical and Electronic Engineering