Abstract
In this paper, we study the speech user performance of
selected parallel interference cancellation (PIC)
algorithms in a single-cell high speed uplink packet
access (HSUPA) system. To combat intersymbol interference
(ISI), single-user chip-level minimum mean-squared error
(MMSE) equalizer is used to detect the data users. PIC is
applied to suppress the interference from data users to
speech users, and RAKE to detect the speech users. As an
input to the PIC stage, we may use the hard or soft
symbol decisions (HD, SD) from the data users'
demodulator or decoder outputs. The latter requires
re-encoding of the decoded symbols. This adds to
complexity, but increases also the reliability of the
interference estimates. Results and analysis are provided
for both ideal and MMSE channel estimation (CE). We show
that the combination of PIC and RAKE outperforms the
simple MMSE equalization in all studied cases. Using
re-encoded soft symbol decisions for interference
estimate calculation always leads to the best
performance. However, in some scenarios the performance
loss due to using the soft symbol decisions from the
demodulator output is almost negligible. (9 refs.)
| Original language | English |
|---|---|
| Title of host publication | Proceedings |
| Subtitle of host publication | IEEE Wireless Communications and Networking Conference, WCNC 2009 |
| Place of Publication | Piscataway, NJ, USA |
| Publisher | IEEE Institute of Electrical and Electronic Engineers |
| Number of pages | 5 |
| ISBN (Print) | 978-1-4244-2947-9, 978-1-4244-2948-6 |
| DOIs | |
| Publication status | Published - 2009 |
| MoE publication type | A4 Article in a conference publication |
| Event | IEEE Wireless Communications and Networking Conference, WCNC 2009 - Budapest, Hungary Duration: 5 Apr 2009 → 8 Apr 2009 |
Conference
| Conference | IEEE Wireless Communications and Networking Conference, WCNC 2009 |
|---|---|
| Abbreviated title | WCNC 2009 |
| Country/Territory | Hungary |
| City | Budapest |
| Period | 5/04/09 → 8/04/09 |