Choi, B. J. and Hanzo, L. (2001) Optimum Mode-Switching Assisted Adaptive Modulation. In: Globecom 2001, 25-29 November 2001, San Antonio, USA. pp. 3316-3320.
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Abstract
Adaptive modulation techniques combat fading by employing a suitable modulation mode depending on the instantaneous channel conditions for improving the Bit Error Rate (BER) performance or the average through-put. Based on a generic model of constant-power adaptive modulation, exact closed form expressions of the average BER and the average throughput are derived, when employing square Quadrature Amplitude Modulation (QAM) or Phase Shift Keying (PSK) as the constituent modulation modes, operating over a Nakagami fading channel. The optimum modulation-mode switching levels, achieving the highest possible throughput under the constraint of the average BER, are obtained using the Lagrangian optimisation method. Adaptive modulation employing the optimum switching levels shows a superior performance, while maintaining a constant average BER.
| Creators: | B.J. Choi, L. Hanzo |
|---|---|
| Item Type: | Conference or Workshop Item |
| Research Group: | Communications Research Group |
| Deposited On: | 18 Dec 2003 by Harvey, Denise |
| ID Code: | 6180 |
| Last Modified: | 18 Feb 2010 14:52 |
| Performance Indicator: | EZ~02~02~04 |
| Citations: | Google Scholar: 9 |
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