Abstract
Chip interleaving technique has been proposed for DS-CDMA to eliminate the multiple-access interference (MAI). In this paper, we develop this technique to provide the single- or multicarrier CDMA with flexible low-to-high bit rate transmission by jointly using 2-dimensional (2D) OVSF spreading and chip interleaving for quasi-synchronous uplink transmissions in time- and frequency-selective fading channels. Through appropriate design of 2D spreading code assignment, not only the maximum time- and frequency-domain diversity can be achieved but also users are equipped with multi-rate services. The complexity of receivers is greatly reduced since single-user frequency-domain equalization (FDE) based on the MMSE criterion can be applied for signal detection. Computer simulation results show that the multi-rate transmission is possible for the 2D OVSF spread/chip-interleaved CDMA uplink and the bit error rate (BER) performance with turbo coding is very robust against Doppler spread.
| Original language | English |
|---|---|
| Title of host publication | 2006 IEEE 63rd Vehicular Technology Conference, VTC 2006-Spring - Proceedings |
| Pages | 1767-1771 |
| Number of pages | 5 |
| Volume | 4 |
| Publication status | Published - 2006 Dec 1 |
| Event | 2006 IEEE 63rd Vehicular Technology Conference, VTC 2006-Spring - Melbourne, Australia Duration: 2006 May 7 → 2006 Jul 10 |
Other
| Other | 2006 IEEE 63rd Vehicular Technology Conference, VTC 2006-Spring |
|---|---|
| Country/Territory | Australia |
| City | Melbourne |
| Period | 06/5/7 → 06/7/10 |
Keywords
- 2-dimensional OVSF spreading
- CDMA
- Chip interleaving
- Multi-rate
- Uplink transmission
ASJC Scopus subject areas
- Computer Science Applications
- Applied Mathematics
- Electrical and Electronic Engineering