Abstract
A bandwidth-efficient variable-rate adaptive channel coding scheme, ATCQAM, for time-varying flat-fading channels is proposed. In addition to the forward channel, a low-capacity feedback channel is needed to convey channel state information to the transmitter, possibly with delays and noise. A number of transmission modes, with varying throughputs, are incorporated at the transmitter. Appropriate transmission modes are selected based on the feedback channel states. Design issues for the ATCQAM are considered. A closed-loop control scheme to maintain mode synchronization between the transmitter and the receiver is discussed. The effects of feedback delay, a noisy feedback channel, and mobile speed are investigated. Analytical bounds are derived and simulations are performed to verify the results.
| Original language | English |
|---|---|
| Pages (from-to) | 1550-1560 |
| Number of pages | 11 |
| Journal | IEEE Transactions on Communications |
| Volume | 49 |
| Issue number | 9 |
| DOIs | |
| Publication status | Published - Sept 2001 |
| Externally published | Yes |
Keywords
- Adaptive coded QAM
- Variable-rate adaptive channel coding
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