1995 Fiscal Year Final Research Report Summary
Evaluation of New Trellis Coded Modulation Schemes for Nextage Mobile Communications
| Project/Area Number |
06452241
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
情報通信工学
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| Research Institution | Kyoto Institute of Technology |
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Principal Investigator |
KASAHARA Masao Kyoto Institute of Technology, Dept.of Eng.and Design, Professor, 工芸学部, 教授 (30029045)
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| Co-Investigator(Kenkyū-buntansha) |
INABA Hiroyuki Kyoto Institute of Technology, Dept.of Eng.and Design, Assistant, 工芸学部, 助手 (40243117)
WAKASUGI Koichiro Kyoto Institute of Technology, Dept.of Eng.and Design, Associate Professor, 工芸学部, 助教授 (40135629)
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| Project Period (FY) |
1994 – 1995
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| Keywords | Trellis Coded Modulation / Mobile Communication / Multi Dimensional Encoder / pi / 4-shift QPSK / Design of Signal Points / Convolutional Code / Viterbi decoder / Parallel path |
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| Research Abstract |
A new design method, which is referred to as the matched design method, for concatenated trellis-coded modulation (TCM) is presented. Most of the conventional concatenated TCM employs TCM designed by maximizing the minimum squared Euclidean free distance, d^2_e. With the matched design method, we maximize d^2_ (t) instead of d^2_e, where d^2_ (t) is the effective minimum squared Euclidean distance (MSED) when the outer code has a t-error correcting capability. The effective MSED is derived from the Euclidean/Hamming (E/H) joint weight distribution of terminated TCM.The new classes of 2-dimensional (2D) codes are found by a computer search. Under the performance measures of the effective MSED or the effective multiplicity, these codes are superior to the conventional codes such as the Ungerboeck's codes when those are used as an inner code.
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