tailieunhanh - Báo cáo hóa học: "Research Article Generalized Punctured Convolutional Codes with Unequal Error Protection"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article Generalized Punctured Convolutional Codes with Unequal Error Protection | Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2008 Article ID 280831 6 pages doi 2008 280831 Research Article Generalized Punctured Convolutional Codes with Unequal Error Protection Cecilio Pimentel 1 Richard Demo Souza 2 Bartolomeu F. Uchoa-Filho 3 and Marcelo Eduardo Pellenz4 1 Department of Electronics and Systems Federal University of Pernambuco UFPE Recife 50711-970 Brazil 2 Department of Electronics Federal Technological University of Parana UTFPR Curitiba 80230-901 Brazil 3 Department of Electrical Engineering Federal University of Santa Catarina UFSC Florianopolis 88040-900 Brazil 4 Graduate Program in Computer Science Pontifical Catholic University of Parana PUCPR Curitiba 80215-901 Brazil Correspondence should be addressed to Richard Demo Souza richard@ Received 22 July 2008 Accepted 29 October 2008 Recommended by Azzedine Zerguine We conduct a code search restricted to the recently introduced class of generalized punctured convolutional codes GPCCs to find good unequal error protection UEP convolutional codes for a prescribed minimal trellis complexity. The trellis complexity is taken to be the number of symbols per information bit in the minimal trellis module for the code. The GPCC class has been shown to possess codes with good distance properties under this decoding complexity measure. New good UEP convolutional codes and their respective effective free distances are tabulated for a variety of code rates and minimal trellis complexities. These codes can be used in several applications that require different levels of protection for their bits such as the hierarchical digital transmission of video or images. Copyright 2008 Cecilio Pimentel et al. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. 1. INTRODUCTION In several .