Unilevel Wavelet based Power Allocation for Wireless Image Transmission
Mididoddi Padmaja, K. Prasuna · 2011
Power control has been an effective approach for mitigating the effect of fading in the quality of signal transmission over wireless channels. The system typically involves a mechanism of measuring the quality of the channel seen by the receiver and providing such information to the transmitter to adjust the amount of transmitted power. These systems are considered as opportunistic systems since they take advantage of the information about the channel to optimize the communications process. The proposed algorithm performs power allocation for individual bits to minimize the Root Mean Square Error (RMSE) of a 2D-signal transmitted over AWGN channel. Different Power Allocation methods are applied to first level approximation coefficients of Haar wavelets. A gain in Eb/No is observed for the proposed power allocation method over conventional power allocation method. This gain is achieved without any increase in bandwidth.