Abstract
In this paper, we address the issue of the design of link adaptation mechanisms in the context of Multi-Carrier Spread-Spectrum (MC-SS) transmission systems. By optimally varying the frequency pilot pattern, we present two original adaptation strategies that manage to preserve the requested 'QoS' parameter, in our case the minimum BER target The dynamic sub-carrier allocation policy is first detailed and then adaptive pilot pattern results are presented for different channel conditions and 'QoS'. Moreover an original geometric interpretation of the theoretical BER expression in terms of Bézier curves allows complexity reduction of the overall adaptation scheme. Based on the metric of the ratio between pilot and data sub-carriers (pilot overhead), we thus propose a generalizing adaptive scheme, taking into account this loss of bandwidth parameter, and varying both the Spreading Factor and the pilot tone pattern. Allocation results of such optimal adaptation policy are finally presented.
| Original language | English |
|---|---|
| Pages (from-to) | 385-388 |
| Number of pages | 4 |
| Journal | IEEE Vehicular Technology Conference |
| Volume | 60 |
| Issue number | 1 |
| Publication status | Published - 2004 |
| Externally published | Yes |
| Event | 2004 IEEE 60th Vehicular Technology Conference, VTC2004-Fall: Wireless Technologies for Global Security - Los Angeles, CA, United States Duration: 26 Sept 2004 → 29 Sept 2004 |
Keywords
- MC-SS
- MRC
- OVSF
- Pilot Pattern