Abstract
In this paper, we propose and analyze a multi-level acknowledgement scheme for hybrid ARQ (H-ARQ) systems, which modifies the general ACK/NAK signals to represent multilevel information. For instance, the other signals except the ACK/NAK signals may be used for scheduling of retransmission in the H-ARQ scheme, which results in increasing the resolution of the uplink channel estimation signals. Simulation results demonstrate that when the retransmission interval is set to the optimal length, the proposed H-ARQ scheme shows a 0.5-2 dB gain with properly selected parameters.
| Original language | English |
|---|---|
| Pages (from-to) | 334-337 |
| Number of pages | 4 |
| Journal | IEICE Transactions on Communications |
| Volume | E92-B |
| Issue number | 1 |
| DOIs | |
| State | Published - 2009 |
Keywords
- HSDPA
- Hybrid ARQ
- Multilevel control signaling
- UMTS