Adaptive Sigma Delta Modulators for Fading Channels

Shakya, I, Ali, F H and Stipidis, E (2005) Adaptive Sigma Delta Modulators for Fading Channels. In: The 5th IEE international conference on ADDA 2005 : advanced A/D and D/A conversion techniques and their applications : University of Limerick, Limerick, Ireland : 25-27 July 2005, Limerick, Ireland.

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In this paper we present a single loop higher order sigma delta modulator with adaptive input gain to the fading channel variation. The power of the received signal is measured periodically in block of samples to determine the fading level and corresponding gain values are used to compensate for the effect of the fading channel. The signal is multiplied with the chosen gain to achieve the approximately constant signal level while meeting the stability requirement of the modulator. The results show that the proposed adaptive system significantly outperforms the fixed gain modulator in terms of the bit error rate (BER).

Item Type: Conference or Workshop Item (Paper)
Schools and Departments: School of Engineering and Informatics > Engineering and Design
Depositing User: Indu Lal Shakya
Date Deposited: 06 Feb 2012 19:50
Last Modified: 30 Mar 2012 11:25
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