tailieunhanh - Báo cáo hóa học: " Research Article Mapping Rearrangement for Parallel Concatenated Trellis Coded Modulation"

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 Mapping Rearrangement for Parallel Concatenated Trellis Coded Modulation | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2008 Article ID 513971 6 pages doi 2008 513971 Research Article Mapping Rearrangement for Parallel Concatenated Trellis Coded Modulation Mustapha Benjillali and LeszekSzczecinski Institut National de la Recherche Scientifique INRS Centre Energie Materiaux et Telecommunications EMT Montreal QC Canada H5A 1K6 Correspondence should be addressed to Mustapha Benjillali benjillali@ Received 29 May 2008 Revised 23 October 2008 Accepted 12 December 2008 Recommended by Wolfgang Gerstacker Mapping rearrangement MaRe for the hybrid ARQ HARQ based on the parallel concatenated trellis coded modulation PCTCM is analyzed. We demonstrate that the performance of the PCTCM receiver is intrinsically limited by the MaRe design and we propose a new mapping scheme to fit the structure of PCTCM transceivers. Depending on the HARQ scenarios the proposed scheme offers gains between and dB when compared with known MaRe schemes. Copyright 2008 M. Benjillali and L. Szczecinski. 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 this paper we propose a mapping rearrangement MaRe scheme suitable for the parallel concatenated trellis coded modulation PCTCM in the automatic repeat request ARQ context. This retransmission mechanism increases the reliability of the communication link and handles the retransmissions of erroneous data packets. It is commonly combined with channel coding and called hybrid ARQ HARQ . Here we analyze HARQ schemes where the binary contents of all transmissions are identical and the difference between the retransmissions resides only in the bits-to-symbols mappings. When appropriately designed such a mapping rearrangement MaRe also known as mapping diversity may offer important