Abstract
In order to use imperfect channel state information (ICSI) to adaptively schedule resources more effectively so as to improve uplink average throughput, an expression of average successfully transmitted rate of a user in a uplink system was derived using ICSI and M-QAM modulation, and its accuracy was verified by simulation. A adaptive modulation scheme using ICSI was proposed based on the expression. Through investigating the impact of ICSI on adaptive subcarrier allocation and adaptive modulation respectively, the impact of the reliability of ICSI on uplink average throughput was analyzed. Simulation results showed that the proposed adaptive modulation could fight against the impact of decrease of the reliability of ICSI on average throughput effectively. By contrast, the decline of the reliability of ICSI had a more remarkable impact on average throughput of uplink with adaptive subcarrier allocation algorithm.
| Original language | English |
|---|---|
| Pages (from-to) | 149-154 |
| Number of pages | 6 |
| Journal | Sichuan Daxue Xuebao (Gongcheng Kexue Ban)/Journal of Sichuan University (Engineering Science Edition) |
| Volume | 44 |
| Issue number | 5 |
| State | Published - Sep 2012 |
Keywords
- Adaptive modulation
- Channel state information
- Single carrier frequency division multiple access
- Throughput
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