| Budget Amount *help |
¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2017: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2016: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2015: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2014: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
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| Outline of Final Research Achievements |
Quadrature Amplitude Modulation (QAM) is applied to many digital communications, because it provides high speed transmission. Firstly, a matched mapping technique for QAM has been proposed. The technique allows to be represented the distances between all pairwise signal points in QAM by the distances between the origin and the other points. The technique offers an easy search for good codes. Thus, new non-binary convolutional codes with the largest minimum free distance have been searched for QAM. The performance of the new codes has been evaluated theoretically and compared with a conventional TCM. The results show the proposed codes are effective. In addition, integer space-time block codes for QAM have been presented. They have been searched for using the determinant and trace design criteria calculated by the matched mapping. The codes have been compared with Golden code and Alamouti code. The results show the proposed codes are effective for high spectral efficiencies.
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