Title :
Optimizing power allocation in analog joint source-channel coding
Author :
Hu, Yichuan ; Garcia-Frias, Javier
Author_Institution :
Dept. of Electr. & Comput. Eng., Univ. of Delaware, Newark, DE
Abstract :
We propose an analog joint source-channel coding scheme for the transmission of analog Gaussian sources over AWGN channels. The key idea is the combination of a 1:1 uncoded system in which source symbols are directly sent through the noisy channel and a 2:1 non-linear system in which two source outputs are mapped to one channel symbol using space-filling curves. By doing so, the proposed scheme can achieve any bandwidth reduction ratio between 1:1 and 2:1. The main contribution of this paper is the derivation of the optimal power allocation between the two constituent systems in order to maximize the overall signal-to-distortion ratio (SDR).
Keywords :
AWGN channels; combined source-channel coding; AWGN channels; analog Gaussian sources; analog joint source-channel coding; bandwidth reduction ratio; power allocation; spacefilling curves; AWGN channels; Additive white noise; Bandwidth; Delay; Digital systems; Gaussian noise; Maximum likelihood decoding; Nonlinear distortion; Rate distortion theory; Vector quantization;
Conference_Titel :
Information Sciences and Systems, 2009. CISS 2009. 43rd Annual Conference on
Conference_Location :
Baltimore, MD
Print_ISBN :
978-1-4244-2733-8
Electronic_ISBN :
978-1-4244-2734-5
DOI :
10.1109/CISS.2009.5054693
