Title :
Iterative joint decoding for sensor networks with binary CEO model
Author :
Haghighat, Javad ; Behroozi, Hamid ; Plant, David V.
Author_Institution :
Dept. of Electr.&Comput. Eng., McGill Univ., Montreal, QC
Abstract :
An iterative joint decoding algorithm for data gathering wireless sensor networks is proposed in where the correlation between sensorspsila data is considered as a global code and iterative decoding is performed by concatenating the global decoder with the decoder of error correcting code applied to encode sensors observations. We apply this algorithm for sensor networks with binary CEO model where sensors observe different noisy versions of a single source, located away from sensors. This calls for employing more powerful error correcting codes, therefore we apply convolutional codes (Hamming codes and single parity check codes are applied in). We use the concept of iterative horizontal-vertical decoding for concatenated block codes to formulate the update rules for L-values for the considered binary CEO model. Our simulations confirm that the iterative joint decoding scheme substantially decreases the bit error rate compared with the separate decoding scheme, and reaches the minimum achievable distortion for channels with significantly higher noise levels.
Keywords :
Hamming codes; binary codes; block codes; concatenated codes; convolutional codes; error correction codes; error statistics; iterative decoding; parity check codes; wireless sensor networks; Hamming code; binary CEO model; bit error rate; concatenated block code; convolutional code; data gathering wireless sensor network; error correcting code decoder; global decoder; iterative joint horizontal-vertical decoding algorithm; parity check code; sensor observation encoding; Bit error rate; Block codes; Concatenated codes; Convolutional codes; Error correction codes; Iterative algorithms; Iterative decoding; Noise level; Parity check codes; Wireless sensor networks; CEO problem; convolutional code; iterative decoding; sensor networks;
Conference_Titel :
Signal Processing Advances in Wireless Communications, 2008. SPAWC 2008. IEEE 9th Workshop on
Conference_Location :
Recife
Print_ISBN :
978-1-4244-2045-2
Electronic_ISBN :
978-1-4244-2046-9
DOI :
10.1109/SPAWC.2008.4641566